Public release of katbox

This commit is contained in:
Renán Del Valle 2021-04-12 12:00:01 -07:00
commit 4c764e09a4
46 changed files with 4646 additions and 0 deletions

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/bin
.idea

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# v0.0.1
* Support for delayed garbage collection. Once a volume has been unmounted it is not deleted until a certain
amount of time has passed.
* Upon `NodeUnpublish` directories are unmounted but not removed from the underlying storage.
* Node driver handles calls with folders that it cannot find in memory while warning.
* Node driver now detects when a volume queued for deletion has already been deleted by an external source
and removes it from the queue.

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FROM alpine
LABEL maintainers="PayPal"
LABEL description="Katbox Driver"
# Add util-linux to get a new version of losetup.
RUN apk add util-linux
COPY ./bin/katboxplugin /katboxplugin
ENTRYPOINT ["/katboxplugin"]

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# Copyright 2019 The Kubernetes Authors.
#
# Modifications copyright 2020 PayPal.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
REV=$(shell git describe --long --tags --match='v*' --dirty 2>/dev/null || git rev-list -n1 HEAD)
VERSION := 1.0.0_$(shell git rev-parse --short HEAD)
all: build
clean:
-rm -rf bin
build:
CGO_ENABLED=0 GOOS="linux" GOARCH="amd64" go build -a -ldflags '-X main.version=$(REV) -extldflags "-static"' -o ./bin/katboxplugin ./cmd/katboxplugin/main.go
docker-build-katbox:
docker build . --tag quay.io/katbox/katboxplugin:${VERSION} --no-cache
docker-push-katbox:
docker push quay.io/katbox/katboxplugin:${VERSION}
docker-build-stream:
docker build ./stream --tag quay.io/katbox/stream:${VERSION} --no-cache
docker-push-stream:
docker push quay.io/katbox/stream:${VERSION}
ci-build: docker-build-katbox docker-build-stream docker-push-katbox docker-push-stream

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# CSI Katbox Driver
Katbox is an inline ephemeral volume manager with delayed deletion for Kubernetes.
It is inspired by the "Sandbox" functionality provided by
[Apache Mesos](http://mesos.apache.org/documentation/latest/sandbox/).
## Pre-requisite
- Kubernetes cluster
- Running version 1.18 or later
- Access to terminal with `kubectl` installed
## Deployment
Deployment varies depending on the Kubernetes version your cluster is running:
- [Deployment for Kubernetes 1.18 and later](docs/deploy-1.18-and-later.md)
## Examples
The following examples assume that the CSI Katbox driver has been deployed and validated:
- [Inline ephemeral volumes](docs/example-ephemeral.md)
## Building the binaries
If you want to build the driver yourself, you can do so with the following command from the root directory:
```shell
make
```
## Building a docker image
If you want to make a docker image to be used on a kubernetes cluster you may do so with the following command:
```shell
docker build . -t <image name>
```
## Documentation
A high level overview of how katbox works can be found [here](docs/overview.md)
A closer look at how the creation and deletion of volumes works can be found [here](docs/create-delete-flow.md)
# Credits
This project was initially a fork of
[CSI Hostpath driver](https://github.com/kubernetes-csi/csi-driver-host-path).

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/*
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"flag"
"fmt"
"os"
"path"
"time"
"github.com/paypal/katbox/pkg/katbox"
)
func init() {
flag.Set("logtostderr", "true")
}
var (
endpoint = flag.String("endpoint", "unix://tmp/csi.sock", "CSI endpoint")
driverName = flag.String("drivername", "kbox.csi.paypal.com", "name of the driver")
nodeID = flag.String("nodeid", "", "node id")
maxVolumesPerNode = flag.Int64("maxvolumespernode", 0, "limit of volumes per node")
workdir = flag.String("workdir", "/csi-data-dir", "Location where plugin will store configuration and directories")
afterLifespan = flag.Duration(
"afterlifespan",
time.Hour*12,
"Length of time to keep a volume after a request for deletion",
)
pruneInterval = flag.Duration(
"pruneinterval",
time.Second*5,
"Interval at which the background process looking to evict deleted volumes runs.",
)
headroom = flag.Float64(
"headroom",
0.1,
"Value between 0.0 and 1.0 (inclusive) that determines the percentage of space that should be attempted to be kept free in the underlying storage device",
)
showVersion = flag.Bool("version", false, "Show version.")
// Set by the build process
version = ""
)
func main() {
flag.Parse()
if *showVersion {
baseName := path.Base(os.Args[0])
fmt.Println(baseName, version)
return
}
handle()
os.Exit(0)
}
func handle() {
driver, err := katbox.NewKatboxDriver(
*driverName,
*nodeID,
*endpoint,
*workdir,
*maxVolumesPerNode,
*afterLifespan,
*pruneInterval,
*headroom,
version,
)
if err != nil {
fmt.Printf("Failed to initialize driver: %s", err.Error())
os.Exit(1)
}
driver.Run()
}

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The deployment for Kubernetes 1.18 uses VolumeSnapshot Beta CRDs and thus is incompatible
with Kubernetes < 1.17 when the VolumeSnapshot CRDs were Alpha.

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---
apiVersion: v1
kind: Namespace
metadata:
name: katbox
---
apiVersion: storage.k8s.io/v1
kind: CSIDriver
metadata:
name: katbox.csi.paypal.com
spec:
# Supports persistent and ephemeral inline volumes.
volumeLifecycleModes:
- Ephemeral
# To determine at runtime which mode a volume uses, pod info and its
# "csi.storage.k8s.io/ephemeral" entry are needed.
podInfoOnMount: true
attachRequired: false
---
kind: DaemonSet
apiVersion: apps/v1
metadata:
name: csi-katboxplugin
namespace: katbox
spec:
selector:
matchLabels:
app: csi-katboxplugin
template:
metadata:
labels:
app: csi-katboxplugin
spec:
hostNetwork: true
tolerations:
- key: "node-role.kubernetes.io/master"
operator: "Exists"
effect: "NoSchedule"
- operator: "Exists"
containers:
- name: node-driver-registrar
image: k8s.gcr.io/sig-storage/csi-node-driver-registrar:v2.0.1
args:
- --v=5
- --csi-address=/csi/csi.sock
- --kubelet-registration-path=/var/lib/kubelet/plugins/csi-katbox/csi.sock
securityContext:
# This is necessary only for systems with SELinux, where
# non-privileged sidecar containers cannot access unix domain socket
# created by privileged CSI driver container.
privileged: true
env:
- name: KUBE_NODE_NAME
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: spec.nodeName
volumeMounts:
- mountPath: /csi
name: socket-dir
- mountPath: /registration
name: registration-dir
- mountPath: /csi-data-dir
name: csi-data-dir
- name: katbox
image: quay.io/katbox/katboxplugin:v1.0.0
args:
- "--drivername=katbox.csi.paypal.com"
- "--v=5"
- "--endpoint=$(CSI_ENDPOINT)"
- "--nodeid=$(KUBE_NODE_NAME)"
- "--afterlifespan=3h"
- "--headroom=.1"
env:
- name: CSI_ENDPOINT
value: unix:///csi/csi.sock
- name: KUBE_NODE_NAME
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: spec.nodeName
securityContext:
privileged: true
ports:
- containerPort: 9898
name: healthz
protocol: TCP
livenessProbe:
failureThreshold: 5
httpGet:
path: /healthz
port: healthz
initialDelaySeconds: 10
timeoutSeconds: 3
periodSeconds: 10
volumeMounts:
- mountPath: /csi
name: socket-dir
- mountPath: /var/lib/kubelet/pods
mountPropagation: Bidirectional
name: mountpoint-dir
- mountPath: /var/lib/kubelet/plugins
mountPropagation: Bidirectional
name: plugins-dir
- mountPath: /csi-data-dir
name: csi-data-dir
- mountPath: /dev
name: dev-dir
- name: liveness-probe
volumeMounts:
- mountPath: /csi
name: socket-dir
image: k8s.gcr.io/sig-storage/livenessprobe:v2.2.0
args:
- --csi-address=/csi/csi.sock
- --health-port=9898
volumes:
- hostPath:
path: /var/lib/kubelet/plugins/csi-katbox
type: DirectoryOrCreate
name: socket-dir
- hostPath:
path: /var/lib/kubelet/pods
type: DirectoryOrCreate
name: mountpoint-dir
- hostPath:
path: /var/lib/kubelet/plugins_registry
type: Directory
name: registration-dir
- hostPath:
path: /var/lib/kubelet/plugins
type: Directory
name: plugins-dir
- hostPath:
# 'path' is where PV data is persisted on host.
# using /tmp is also possible while the PVs will not available after plugin container recreation or host reboot
path: /var/lib/csi-katbox-data/
type: DirectoryOrCreate
name: csi-data-dir
- hostPath:
path: /dev
type: Directory
name: dev-dir

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---
apiVersion: v1
kind: Namespace
metadata:
name: katbox
---
apiVersion: storage.k8s.io/v1
kind: CSIDriver
metadata:
name: katbox.csi.paypal.com
spec:
# Supports persistent and ephemeral inline volumes.
volumeLifecycleModes:
- Ephemeral
# To determine at runtime which mode a volume uses, pod info and its
# "csi.storage.k8s.io/ephemeral" entry are needed.
podInfoOnMount: true
attachRequired: false
fsGroupPolicy: File
---
kind: DaemonSet
apiVersion: apps/v1
metadata:
name: csi-katboxplugin
namespace: katbox
spec:
selector:
matchLabels:
app: csi-katboxplugin
template:
metadata:
labels:
app: csi-katboxplugin
spec:
hostNetwork: true
tolerations:
- key: "node-role.kubernetes.io/master"
operator: "Exists"
effect: "NoSchedule"
- operator: "Exists"
containers:
- name: node-driver-registrar
image: k8s.gcr.io/sig-storage/csi-node-driver-registrar:v2.0.1
args:
- --v=5
- --csi-address=/csi/csi.sock
- --kubelet-registration-path=/var/lib/kubelet/plugins/csi-katbox/csi.sock
securityContext:
# This is necessary only for systems with SELinux, where
# non-privileged sidecar containers cannot access unix domain socket
# created by privileged CSI driver container.
privileged: true
env:
- name: KUBE_NODE_NAME
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: spec.nodeName
volumeMounts:
- mountPath: /csi
name: socket-dir
- mountPath: /registration
name: registration-dir
- mountPath: /csi-data-dir
name: csi-data-dir
- name: katbox
image: k8s.gcr.io/sig-storage/livenessprobe:v2.2.0
args:
- "--drivername=katbox.csi.paypal.com"
- "--v=5"
- "--endpoint=$(CSI_ENDPOINT)"
- "--nodeid=$(KUBE_NODE_NAME)"
- "--afterlifespan=3h"
- "--headroom=.1"
env:
- name: CSI_ENDPOINT
value: unix:///csi/csi.sock
- name: KUBE_NODE_NAME
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: spec.nodeName
securityContext:
privileged: true
ports:
- containerPort: 9898
name: healthz
protocol: TCP
livenessProbe:
failureThreshold: 5
httpGet:
path: /healthz
port: healthz
initialDelaySeconds: 10
timeoutSeconds: 3
periodSeconds: 10
volumeMounts:
- mountPath: /csi
name: socket-dir
- mountPath: /var/lib/kubelet/pods
mountPropagation: Bidirectional
name: mountpoint-dir
- mountPath: /var/lib/kubelet/plugins
mountPropagation: Bidirectional
name: plugins-dir
- mountPath: /csi-data-dir
name: csi-data-dir
- mountPath: /dev
name: dev-dir
- name: liveness-probe
volumeMounts:
- mountPath: /csi
name: socket-dir
image: k8s.gcr.io/sig-storage/livenessprobe:v2.2.0
args:
- --csi-address=/csi/csi.sock
- --health-port=9898
volumes:
- hostPath:
path: /var/lib/kubelet/plugins/csi-katbox
type: DirectoryOrCreate
name: socket-dir
- hostPath:
path: /var/lib/kubelet/pods
type: DirectoryOrCreate
name: mountpoint-dir
- hostPath:
path: /var/lib/kubelet/plugins_registry
type: Directory
name: registration-dir
- hostPath:
path: /var/lib/kubelet/plugins
type: Directory
name: plugins-dir
- hostPath:
# 'path' is where PV data is persisted on host.
# using /tmp is also possible while the PVs will not available after plugin container recreation or host reboot
path: /var/lib/csi-katbox-data/
type: DirectoryOrCreate
name: csi-data-dir
- hostPath:
path: /dev
type: Directory
name: dev-dir

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kubernetes-1.20

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# Katbox Documentation
* [High level overview](overview.md)
* [Volume creation and deletion flow](create-delete-flow.md)
* [How to deploy Katbox](deploy-1.18-and-later.md)
* [Running an sample application leveraging katbox](example-ephemeral.md)

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# Creation and Deletion of Volumes
## Volume Creation Flow
![Katbox Create Flow](images/katboxCreate.png)
A request is made to the kubernetes to create a pod. Kubernetes schedules a pod on a worker node in the cluster.
The kubelet sees that there is a request for an ephemeral-inline volume from the driver `katbox.csi.paypal.com` so it looks through its registered plugins and finds Katbox. It creates a `NodePublishVolume` api requests through the Unix Domain Socket registered for Katbox by the CSI Node Registrar.
Katbox receives the request and creates a folder in its working directory. By default, this directory is located at `/var/lib/csi-katbox`.
Using the information provided by the request, a new folder is created in the working directory using the volume ID received:
`$WORKDIR/<Volume ID>`
This newly created folder is then bind mounted to the mount location expected by the kubelet called the `targetPath`. By default this folder's location is in:
`/var/lib/kubelet/pods/<pod ID>/volumes/kubernetes.io-csi/<volume name>/mount`
The pod UUID is generated by Kubernetes when the pod is created, while the volume name is the name given to the mount in the spec.
Once the bind mount is successful, Katbox replies to the request as having succeeded.
If for any reason katbox is unable to fulfill the request, an error is returned to the kubelet and the pod creation process fails.
## Volume Deletion Flow
![Katbox Delete Flow](images/katboxDelete.png)
When a pod which uses a Katbox allocated volume is deleted, the kubelet sends a `NodeUnpublishVolume` api request to katbox via a previously registered Unix Domain Socket.
Katbox unbinds the folder that was bound from katbox's working directory to the `targetPath`. Next, katbox adds the volume to its deletion queue and returns a successful deletion message to the kubelet.
If for some reason katbox is unable to unmount the given folder, katbox will instead return an error to the kubelet which will then begin attempting to retry the deletion.
The information given to the deletion queue includes the path of the folder used for the volume inside katbox's working directory, the time at which it was deleted, as well as a lifespan.
An example of the information given to the queue looks like this:
```
{
Path: "/var/lib/kubelet/csi-katbox/<pod ID>/<volume ID>",
Time: time.Now(),
Lifespan: <time.Duration,
}
```
The lifespan is set by the `--afterLifespan` flag passed to the katbox plugin. It determines how long after the deletion event we should hold on to the information stored inside folder whose volume was deleted.
A goroutine is then responsible for looking through the deletion queue and determining if a deletion candidate has aged passed its afterlife span. If it has, the folder inside katbox's working directory is deleted at this time and the candidate is removed from the deletion queue. If the deletion candidate is _not_ yet eligible for deletion, the candidate remains in the queue.
The after lifespan is also influenced by a `pressureFactor` which is derived from the `--headroom` flag passed to the katbox plugin. The `pressureFactor` may decrease the age needed for an eviction to happen if the underlying storage being used by katbox is currently experiencing high utilization.
High utilization in this case is defined by using the space defined by a value between 0.0 and 1.0 inclusive passed as the headroom flag. The default value for headroom is `0.1`. Therefore, the age required to be evicted will decrease if the underlying storage uses more than 90% of its total disk space.

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## Cluster setup
Kubernetes 1.16+ required due to the Volume context `csi.storage.k8s.io/ephemeral` not existing before this version.
### Create CSIDriver object
Using kubectl, create a CSIDriver object for katbox
```yaml
apiVersion: storage.k8s.io/v1
kind: CSIDriver
metadata:
name: katbox.csi.paypal.com
spec:
# Supports persistent and ephemeral inline volumes.
volumeLifecycleModes:
- Ephemeral
# To determine at runtime which mode a volume uses, pod info and its
# "csi.storage.k8s.io/ephemeral" entry are needed.
podInfoOnMount: true
attachRequired: false
```
### Deploy DaemonSet on to cluster
#### Create a namespace (optional)
It makes it easier for all katbox pods to run in a different namespace.
A dedicated namespace can be created by using kubectl to apply the following configuration:
```yaml
apiVersion: v1
kind: Namespace
metadata:
name: csi-plugins
```
#### Creating the DaemonSet
Deploy the DaemonSet to run katbox (preferably in a namespace that is not used by default)
```shell
$ kubectl apply --namespace csi-plugins -f csi-katbox-plugin.yaml
```
```yaml
kind: DaemonSet
apiVersion: apps/v1
metadata:
name: csi-katboxplugin
spec:
selector:
matchLabels:
app: csi-katboxplugin
template:
metadata:
labels:
app: csi-katboxplugin
spec:
hostNetwork: true
tolerations:
- operator: "Exists"
containers:
- name: node-driver-registrar
image: quay.io/k8scsi/csi-node-driver-registrar:v1.3.0
args:
- --v=5
- --csi-address=/csi/csi.sock
- --kubelet-registration-path=/var/lib/kubelet/plugins/csi-katbox/csi.sock
securityContext:
# This is necessary only for systems with SELinux, where
# non-privileged sidecar containers cannot access unix domain socket
# created by privileged CSI driver container.
privileged: true
env:
- name: KUBE_NODE_NAME
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: spec.nodeName
volumeMounts:
- mountPath: /csi
name: socket-dir
- mountPath: /registration
name: registration-dir
- mountPath: /csi-data-dir
name: csi-data-dir
- name: katbox
image: quay.io/katbox/katboxplugin:latest
args:
- "--drivername=katbox.csi.paypal.com"
- "--v=1"
- "--endpoint=$(CSI_ENDPOINT)"
- "--nodeid=$(KUBE_NODE_NAME)"
- "--afterlifespan=3h"
env:
- name: CSI_ENDPOINT
value: unix:///csi/csi.sock
- name: KUBE_NODE_NAME
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: spec.nodeName
securityContext:
privileged: true
ports:
- containerPort: 9898
name: healthz
protocol: TCP
livenessProbe:
failureThreshold: 5
httpGet:
path: /healthz
port: healthz
initialDelaySeconds: 10
timeoutSeconds: 3
periodSeconds: 2
volumeMounts:
- mountPath: /csi
name: socket-dir
- mountPath: /var/lib/kubelet/pods
mountPropagation: Bidirectional
name: mountpoint-dir
- mountPath: /var/lib/kubelet/plugins
mountPropagation: Bidirectional
name: plugins-dir
- mountPath: /csi-data-dir
name: csi-data-dir
- name: liveness-probe
volumeMounts:
- mountPath: /csi
name: socket-dir
image: quay.io/k8scsi/livenessprobe:v1.1.0
args:
- --csi-address=/csi/csi.sock
- --health-port=9898
volumes:
- hostPath:
path: /var/lib/kubelet/plugins/csi-katbox
type: DirectoryOrCreate
name: socket-dir
- hostPath:
path: /var/lib/kubelet/pods
type: DirectoryOrCreate
name: mountpoint-dir
- hostPath:
path: /var/lib/kubelet/plugins_registry
type: Directory
name: registration-dir
- hostPath:
path: /var/lib/kubelet/plugins
type: Directory
name: plugins-dir
- hostPath:
path: /var/lib/csi-katbox-data/
type: DirectoryOrCreate
name: csi-data-dir
```
### Run example application and validate
Next, validate the deployment. First, ensure all expected pods are running properly:
```shell
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
csi-katboxplugin-298f5 3/3 Running 0 43h
csi-katboxplugin-2qd8d 3/3 Running 0 43h
csi-katboxplugin-hvkjf 3/3 Running 0 43h
csi-katboxplugin-n62fm 3/3 Running 0 43h
csi-katboxplugin-x824j 3/3 Running 3 43h
csi-katboxplugin-zjr6g 3/3 Running 0 43h
```
There should be exactly one katbox pod per node able to schedule work.
From the [examples directory](../examples), run `csi-app-inline.yaml`
```yaml
kind: Pod
apiVersion: v1
metadata:
name: my-csi-app-inline
spec:
containers:
- name: my-frontend
image: busybox
volumeMounts:
- mountPath: "/data"
name: my-csi-volume
command: ["sh", "-c", "while true; do echo hello >> /data/test; sleep 100; done"]
volumes:
- name: my-csi-volume
csi:
driver: katbox.csi.paypal.com
```
Finally, inspect the application pod `my-csi-app` which mounts a katbox volume:
```shell
$ kubectl describe pods/my-csi-app
Name: my-csi-app-inline
Namespace: default
Priority: 0
Node: k8s-test-node-4/10.180.73.244
Start Time: Thu, 16 Jul 2020 13:44:53 -0700
Labels: <none>
Annotations: Status: Running
IP: 10.180.96.189
IPs:
IP: 10.180.96.189
Containers:
my-frontend:
Container ID: docker://f777b8c44d0d146241d73bbc2663b85274dca2e954c19d23ff504e81ffc0e875
Image: busybox
Image ID: docker-pullable://busybox@sha256:9ddee63a712cea977267342e8750ecbc60d3aab25f04ceacfa795e6fce341793
Port: <none>
Host Port: <none>
Command:
sh
-c
while true; do echo hello >> /data/test; sleep 100; done
State: Running
Started: Thu, 16 Jul 2020 13:44:59 -0700
Ready: True
Restart Count: 0
Environment: <none>
Mounts:
/data from my-csi-volume (rw)
/var/run/secrets/kubernetes.io/serviceaccount from default-token-wrfhf (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
my-csi-volume:
Type: CSI (a Container Storage Interface (CSI) volume source)
Driver: katbox.csi.paypal.com
FSType:
ReadOnly: false
VolumeAttributes: <none>
default-token-wrfhf:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-wrfhf
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
node.kubernetes.io/unreachable:NoExecute for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled <unknown> default-scheduler Successfully assigned default/my-csi-app-inline to k8s-test-node-4
Normal Pulling 32s kubelet, k8s-test-node-4 Pulling image "busybox"
Normal Pulled 28s kubelet, k8s-test-node-4 Successfully pulled image "busybox"
Normal Created 28s kubelet, k8s-test-node-4 Created container my-frontend
Normal Started 27s kubelet, k8s-test-node-4 Started container my-frontend
```
## Confirm the katbox driver works
The katpox driver is configured to create new volumes under `/csi-data-dir` inside the katbox container that is specified in the plugin DaemonSet previously deployed.
A file written in a properly mounted katbox volume inside an application should show up inside the katbox container. The following steps confirms that katbox is working properly. First, create a file from the application pod as shown:
```shell
$ kubectl exec -it my-csi-app-inline -- /bin/sh
/ # touch /data/hello-world
/ # exit
```
Find the node in which the sample app is running in by running:
```shell
$ kubectl get pods my-csi-app-inline -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
my-csi-app-inline 1/1 Running 0 7m57s 10.180.96.189 k8s-test-node-4 <none> <none>
```
Next, find the katbox driver for the node on which the sample application is running on:
```shell
$ kubectl get pods -n csi-plugins -o wide --field-selector spec.nodeName=k8s-test-node-4
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
csi-katboxplugin-n62fm 3/3 Running 0 43h 10.180.73.244 k8s-test-node-4 <none> <none>
```
Next, ssh into the katbox container and verify that the file shows up there:
```shell
$ kubectl exec -it csi-katboxplugin-n62fm -n csi-plugin -c katbox -- /bin/sh
```
Then, use the following command to locate the file. If everything works OK you should get a result similar to the following:
```shell
/ # find / -name hello-world
/csi-data-dir/csi-69121cc2ba7624a259442664bc942c00811cf4495faefccdd11efc2e79d1127c/hello-world
/var/lib/kubelet/pods/32a784c5-88a3-4585-8827-989d2c79dbfe/volumes/kubernetes.io~csi/my-csi-volume/mount/hello-world
/ #
```

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# Overview of how Katbox works
The Katbox pod is comprised of a CSI Node Driver, a Liveness probe, as well as a [CSI node driver registrar](https://github.com/kubernetes-csi/node-driver-registrar/).
Before bringing up the Katbox pod, we must register some information with Kubernetes so that Katbox is able to serve requests for ephemeral-inline volumes.
The `kubectl` command is used to tell Kubernetes about our CSI Driver's name, what type of volume lifecycles it supports (ephemeral only), and whether or not we need extra info provided to the CSI when a volume is being mounted (we do).
An example can be seen in[ csi-katbox-driverinfo.yaml](../deploy/latest/katbox/csi-katbox-driverinfo.yaml)
Since we want to be able to create Katbox containers in all worker nodes, we can deploy Katbox as a [DaemonSet](https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/).
![Katbox DaemonSet](images/katboxDaemonSet.png)
An example configuration can be seen in [csi-katbox-plugin.yaml](../deploy/latest/katbox/csi-katbox-plugin.yaml)
![Katbox DaemonSet](images/katboxDeploy.png)
The CSI node driver registrar comes up and registers Katbox by creating a Unix Domain Socket located at`/var/lib/kubelet/plugins_registry/katbox.csi.paypal.com-reg.sock`. The registrar is also responsible for querying the Katbox plugin, via a socket located at `/var/lib/kubelet/plugins/csi-katbox/csi.sock` for information about the plugin using the `GetPluginInfo()` gRPC call. It uses this information provided by the CSI plugin while registering the node with the Kubelet.
If the registration is successful, the Katbox plugin will now be able to receive communication via `/var/lib/kubelet/plugins/csi-katbox/csi.sock` whenever an ephemeral volume from the driver `katbox.csi.paypal.com` is requested. This request will come in the form of a `NodePublishVolume` API call. When an ephemeral-inline volume previously allocated by Katbox needs to be deleted, a `NodeUnpublishVolume` API call will come through the same socket.
The [Liveness probe container](https://github.com/kubernetes-csi/livenessprobe), as its name implies, is responsible for sending HTTP health checks to the Katbox plugin. If the plugin does not reply to the heartbeat requests, the Liveness probe container signals the failure to the kubelet and the kubelet restarts the Katbox plugin container.

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kind: Pod
apiVersion: v1
metadata:
name: my-csi-app-inline
spec:
containers:
- name: my-frontend
image: busybox:1.32.0
volumeMounts:
- mountPath: "/data"
name: my-csi-volume
command: ["sh", "-c", "while true; do echo hello >> /data/test; sleep 100; done"]
volumes:
- name: my-csi-volume
csi:
driver: katbox.csi.paypal.com

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module github.com/paypal/katbox
go 1.16
require (
github.com/container-storage-interface/spec v1.3.0
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
github.com/kubernetes-csi/csi-lib-utils v0.9.0
github.com/ricochet2200/go-disk-usage v0.0.0-20150921141558-f0d1b743428f
github.com/stretchr/testify v1.6.1
go.etcd.io/bbolt v1.3.5
golang.org/x/net v0.0.0-20201209123823-ac852fbbde11
golang.org/x/sys v0.0.0-20201207223542-d4d67f95c62d // indirect
google.golang.org/genproto v0.0.0-20201209185603-f92720507ed4 // indirect
google.golang.org/grpc v1.34.0
k8s.io/kubernetes v1.20.0
k8s.io/mount-utils v0.0.0
k8s.io/utils v0.0.0-20201110183641-67b214c5f920
)
replace (
k8s.io/api => k8s.io/api v0.20.0
k8s.io/apiextensions-apiserver => k8s.io/apiextensions-apiserver v0.20.0
k8s.io/apimachinery => k8s.io/apimachinery v0.21.0-alpha.0
k8s.io/apiserver => k8s.io/apiserver v0.20.0
k8s.io/cli-runtime => k8s.io/cli-runtime v0.20.0
k8s.io/client-go => k8s.io/client-go v0.20.0
k8s.io/cloud-provider => k8s.io/cloud-provider v0.20.0
k8s.io/cluster-bootstrap => k8s.io/cluster-bootstrap v0.20.0
k8s.io/code-generator => k8s.io/code-generator v0.20.1-rc.0
k8s.io/component-base => k8s.io/component-base v0.20.0
k8s.io/component-helpers => k8s.io/component-helpers v0.20.0
k8s.io/controller-manager => k8s.io/controller-manager v0.20.0
k8s.io/cri-api => k8s.io/cri-api v0.20.1-rc.0
k8s.io/csi-translation-lib => k8s.io/csi-translation-lib v0.20.0
k8s.io/kube-aggregator => k8s.io/kube-aggregator v0.20.0
k8s.io/kube-controller-manager => k8s.io/kube-controller-manager v0.20.0
k8s.io/kube-proxy => k8s.io/kube-proxy v0.20.0
k8s.io/kube-scheduler => k8s.io/kube-scheduler v0.20.0
k8s.io/kubectl => k8s.io/kubectl v0.20.0
k8s.io/kubelet => k8s.io/kubelet v0.20.0
k8s.io/legacy-cloud-providers => k8s.io/legacy-cloud-providers v0.20.0
k8s.io/metrics => k8s.io/metrics v0.20.0
k8s.io/mount-utils => k8s.io/mount-utils v0.20.1-rc.0
k8s.io/sample-apiserver => k8s.io/sample-apiserver v0.20.0
)

902
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cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
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cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
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cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
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cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
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github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
github.com/google/uuid v1.0.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
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github.com/googleapis/gnostic v0.4.1/go.mod h1:LRhVm6pbyptWbWbuZ38d1eyptfvIytN3ir6b65WBswg=
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github.com/grpc-ecosystem/grpc-gateway v1.9.0/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
github.com/grpc-ecosystem/grpc-gateway v1.9.5/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
github.com/hashicorp/consul/api v1.1.0/go.mod h1:VmuI/Lkw1nC05EYQWNKwWGbkg+FbDBtguAZLlVdkD9Q=
github.com/hashicorp/consul/sdk v0.1.1/go.mod h1:VKf9jXwCTEY1QZP2MOLRhb5i/I/ssyNV1vwHyQBF0x8=
github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
github.com/hashicorp/go-cleanhttp v0.5.1/go.mod h1:JpRdi6/HCYpAwUzNwuwqhbovhLtngrth3wmdIIUrZ80=
github.com/hashicorp/go-immutable-radix v1.0.0/go.mod h1:0y9vanUI8NX6FsYoO3zeMjhV/C5i9g4Q3DwcSNZ4P60=
github.com/hashicorp/go-msgpack v0.5.3/go.mod h1:ahLV/dePpqEmjfWmKiqvPkv/twdG7iPBM1vqhUKIvfM=
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github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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github.com/tidwall/pretty v1.0.0/go.mod h1:XNkn88O1ChpSDQmQeStsy+sBenx6DDtFZJxhVysOjyk=
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github.com/ugorji/go v1.1.4/go.mod h1:uQMGLiO92mf5W77hV/PUCpI3pbzQx3CRekS0kk+RGrc=
github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
github.com/urfave/cli v1.22.2/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
github.com/urfave/negroni v1.0.0/go.mod h1:Meg73S6kFm/4PpbYdq35yYWoCZ9mS/YSx+lKnmiohz4=
github.com/vektah/gqlparser v1.1.2/go.mod h1:1ycwN7Ij5njmMkPPAOaRFY4rET2Enx7IkVv3vaXspKw=
github.com/vishvananda/netlink v1.1.0/go.mod h1:cTgwzPIzzgDAYoQrMm0EdrjRUBkTqKYppBueQtXaqoE=
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github.com/vishvananda/netns v0.0.0-20200728191858-db3c7e526aae/go.mod h1:DD4vA1DwXk04H54A1oHXtwZmA0grkVMdPxx/VGLCah0=
github.com/vmware/govmomi v0.20.3/go.mod h1:URlwyTFZX72RmxtxuaFL2Uj3fD1JTvZdx59bHWk6aFU=
github.com/willf/bitset v1.1.11-0.20200630133818-d5bec3311243/go.mod h1:RjeCKbqT1RxIR/KWY6phxZiaY1IyutSBfGjNPySAYV4=
github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
go.etcd.io/bbolt v1.3.3/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
go.etcd.io/bbolt v1.3.5 h1:XAzx9gjCb0Rxj7EoqcClPD1d5ZBxZJk0jbuoPHenBt0=
go.etcd.io/bbolt v1.3.5/go.mod h1:G5EMThwa9y8QZGBClrRx5EY+Yw9kAhnjy3bSjsnlVTQ=
go.etcd.io/etcd v0.5.0-alpha.5.0.20200910180754-dd1b699fc489/go.mod h1:yVHk9ub3CSBatqGNg7GRmsnfLWtoW60w4eDYfh7vHDg=
go.mongodb.org/mongo-driver v1.0.3/go.mod h1:u7ryQJ+DOzQmeO7zB6MHyr8jkEQvC8vH7qLUO4lqsUM=
go.mongodb.org/mongo-driver v1.1.1/go.mod h1:u7ryQJ+DOzQmeO7zB6MHyr8jkEQvC8vH7qLUO4lqsUM=
go.mongodb.org/mongo-driver v1.1.2/go.mod h1:u7ryQJ+DOzQmeO7zB6MHyr8jkEQvC8vH7qLUO4lqsUM=
go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20190123085648-057139ce5d2b/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20190228161510-8dd112bcdc25/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190320223903-b7391e95e576/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20190611184440-5c40567a22f8/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20190617133340-57b3e21c3d56/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
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google.golang.org/genproto v0.0.0-20200305110556-506484158171/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
google.golang.org/genproto v0.0.0-20201110150050-8816d57aaa9a/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
google.golang.org/genproto v0.0.0-20201209185603-f92720507ed4 h1:J4dpx/41slnq1aogzUSTuBuvD7VXz7ZLkVpr32YgSlg=
google.golang.org/genproto v0.0.0-20201209185603-f92720507ed4/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.23.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/grpc v1.29.0/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
google.golang.org/grpc v1.34.0 h1:raiipEjMOIC/TO2AvyTxP25XFdLxNIBwzDh3FM3XztI=
google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA51WJ8=
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google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
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google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
gopkg.in/gcfg.v1 v1.2.0/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
gopkg.in/mcuadros/go-syslog.v2 v2.2.1/go.mod h1:l5LPIyOOyIdQquNg+oU6Z3524YwrcqEm0aKH+5zpt2U=
gopkg.in/natefinch/lumberjack.v2 v2.0.0/go.mod h1:l0ndWWf7gzL7RNwBG7wST/UCcT4T24xpD6X8LsfU/+k=
gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
gopkg.in/square/go-jose.v2 v2.2.2/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
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gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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gotest.tools/v3 v3.0.2/go.mod h1:3SzNCllyD9/Y+b5r9JIKQ474KzkZyqLqEfYqMsX94Bk=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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k8s.io/api v0.20.0/go.mod h1:HyLC5l5eoS/ygQYl1BXBgFzWNlkHiAuyNAbevIn+FKg=
k8s.io/apiextensions-apiserver v0.20.0/go.mod h1:ZH+C33L2Bh1LY1+HphoRmN1IQVLTShVcTojivK3N9xg=
k8s.io/apimachinery v0.21.0-alpha.0 h1:iT01Vd/9MmJLSZRGe1zY8SMl6QmvJ52l4a6oKIJPClU=
k8s.io/apimachinery v0.21.0-alpha.0/go.mod h1:WlLqWAHZGg07AeltaI0MV5uk1Omp8xaN0JGLY6gkRpU=
k8s.io/apiserver v0.20.0/go.mod h1:6gRIWiOkvGvQt12WTYmsiYoUyYW0FXSiMdNl4m+sxY8=
k8s.io/cli-runtime v0.20.0/go.mod h1:C5tewU1SC1t09D7pmkk83FT4lMAw+bvMDuRxA7f0t2s=
k8s.io/client-go v0.20.0/go.mod h1:4KWh/g+Ocd8KkCwKF8vUNnmqgv+EVnQDK4MBF4oB5tY=
k8s.io/cloud-provider v0.20.0/go.mod h1:Lz/luSVD5BrHDDhtVdjFh0C2qQCRYdf0b9BHQ9L+bXc=
k8s.io/cluster-bootstrap v0.20.0/go.mod h1:6WZaNIBvcvL7MkPzSRKrZDIr4u+ePW2oIWoRsEFMjmE=
k8s.io/code-generator v0.20.1-rc.0/go.mod h1:UsqdF+VX4PU2g46NC2JRs4gc+IfrctnwHb76RNbWHJg=
k8s.io/component-base v0.20.0/go.mod h1:wKPj+RHnAr8LW2EIBIK7AxOHPde4gme2lzXwVSoRXeA=
k8s.io/component-helpers v0.20.0/go.mod h1:nx6NOtfSfGOxnSZsDJxpGbnsVuUA1UXpwDvZIrtigNk=
k8s.io/controller-manager v0.20.0/go.mod h1:nD4qym/pmCz2v1tpqvlEBVlHW9CAZwedloM8GrJTLpg=
k8s.io/cri-api v0.20.1-rc.0/go.mod h1:2JRbKt+BFLTjtrILYVqQK5jqhI+XNdF6UiGMgczeBCI=
k8s.io/csi-translation-lib v0.20.0/go.mod h1:M4CdD66GxEI6ev8aTtsA2NkK9kIF9K5VZQMcw/SsoLs=
k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
k8s.io/gengo v0.0.0-20201113003025-83324d819ded/go.mod h1:FiNAH4ZV3gBg2Kwh89tzAEV2be7d5xI0vBa/VySYy3E=
k8s.io/heapster v1.2.0-beta.1/go.mod h1:h1uhptVXMwC8xtZBYsPXKVi8fpdlYkTs6k949KozGrM=
k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
k8s.io/klog/v2 v2.2.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
k8s.io/klog/v2 v2.4.0 h1:7+X0fUguPyrKEC4WjH8iGDg3laWgMo5tMnRTIGTTxGQ=
k8s.io/klog/v2 v2.4.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=
k8s.io/kube-aggregator v0.20.0/go.mod h1:3Is/gzzWmhhG/rA3CpA1+eVye87lreBQDFGcAGT7gzo=
k8s.io/kube-controller-manager v0.20.0/go.mod h1:Pmli7dnwIVpwKJVeab97yBt35QEFdw65oqT5ti0ikUs=
k8s.io/kube-openapi v0.0.0-20201113171705-d219536bb9fd/go.mod h1:WOJ3KddDSol4tAGcJo0Tvi+dK12EcqSLqcWsryKMpfM=
k8s.io/kube-proxy v0.20.0/go.mod h1:R97oobM6zSh3ZqFMXi5DzCH/qJXNzua/UzcDmuQRexM=
k8s.io/kube-scheduler v0.20.0/go.mod h1:cRTGsJU3TfQvbMJBmpoPgq9rBF5cQLpLKoOafKwdZnI=
k8s.io/kubectl v0.20.0/go.mod h1:8x5GzQkgikz7M2eFGGuu6yOfrenwnw5g4RXOUgbjR1M=
k8s.io/kubelet v0.20.0/go.mod h1:lMdjO1NA+JZXSYtxb48pQmNERmC+vVIXIYkJIugVhl0=
k8s.io/kubernetes v1.20.0 h1:mnc69esJC3PJgSptxNJomGz2gBthyGLSEy18WiyRH4U=
k8s.io/kubernetes v1.20.0/go.mod h1:/xrHGNfoQphtkhZvyd5bA1lRmz+QkDVmBZu+O8QMoek=
k8s.io/legacy-cloud-providers v0.20.0/go.mod h1:1jEkaU7h9+b1EYdfWDBvhFAr+QpRfUjQfK+dGhxPGfA=
k8s.io/metrics v0.20.0/go.mod h1:9yiRhfr8K8sjdj2EthQQE9WvpYDvsXIV3CjN4Ruq4Jw=
k8s.io/mount-utils v0.20.1-rc.0 h1:lEej6bnisHCO3A/KsfiXQAwwyMzDauT9n8JL1CaXsyk=
k8s.io/mount-utils v0.20.1-rc.0/go.mod h1:Jv9NRZ5L2LF87A17GaGlArD+r3JAJdZFvo4XD1cG4Kc=
k8s.io/sample-apiserver v0.20.0/go.mod h1:tScvbz/BcUG46IOsu2YLt4EjBP7XeUuMzMbQt2tQYWw=
k8s.io/system-validators v1.2.0/go.mod h1:bPldcLgkIUK22ALflnsXk8pvkTEndYdNuaHH6gRrl0Q=
k8s.io/utils v0.0.0-20201110183641-67b214c5f920 h1:CbnUZsM497iRC5QMVkHwyl8s2tB3g7yaSHkYPkpgelw=
k8s.io/utils v0.0.0-20201110183641-67b214c5f920/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
modernc.org/cc v1.0.0/go.mod h1:1Sk4//wdnYJiUIxnW8ddKpaOJCF37yAdqYnkxUpaYxw=
modernc.org/golex v1.0.0/go.mod h1:b/QX9oBD/LhixY6NDh+IdGv17hgB+51fET1i2kPSmvk=
modernc.org/mathutil v1.0.0/go.mod h1:wU0vUrJsVWBZ4P6e7xtFJEhFSNsfRLJ8H458uRjg03k=
modernc.org/strutil v1.0.0/go.mod h1:lstksw84oURvj9y3tn8lGvRxyRC1S2+g5uuIzNfIOBs=
modernc.org/xc v1.0.0/go.mod h1:mRNCo0bvLjGhHO9WsyuKVU4q0ceiDDDoEeWDJHrNx8I=
rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.14/go.mod h1:LEScyzhFmoF5pso/YSeBstl57mOzx9xlU9n85RGrDQg=
sigs.k8s.io/kustomize v2.0.3+incompatible/go.mod h1:MkjgH3RdOWrievjo6c9T245dYlB5QeXV4WCbnt/PEpU=
sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=

4
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## Running end to end tests
* Start [kubernetes in docker (kind) ](https://kind.sigs.k8s.io/) cluster
* Run e2e-tests.sh from anywhere withing the git repo

78
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@ -0,0 +1,78 @@
#!/bin/bash
# Copyright 2020 PayPal.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
GIT_PROJECT_ROOT="$(git rev-parse --show-toplevel)"
pushd "$GIT_PROJECT_ROOT" || exit
# Build latest katbox
docker build . -t quay.io/katbox/katboxplugin:latest
# Load latest katbox on to kind
kind load docker-image quay.io/katbox/katboxplugin:latest
# Pull sidecar containers on to local machine
docker pull quay.io/k8scsi/livenessprobe:v1.1.0
docker pull quay.io/k8scsi/csi-node-driver-registrar:v1.3.0
docker pull busybox:1.32.0
# Load sidecar containers
kind load docker-image quay.io/k8scsi/livenessprobe:v1.1.0
kind load docker-image quay.io/k8scsi/csi-node-driver-registrar:v1.3.0
kind load docker-image busybox:1.32.0
# Deploy katbox onto kind
kubectl apply -f deploy/latest/katbox/csi-katbox-plugin.yaml,deploy/latest/katbox/csi-katbox-driverinfo.yaml
# Run a sample application
kubectl apply -f examples/csi-app-inline.yaml
# Wait for sample app to be ready
kubectl wait --for=condition=Ready pod/my-csi-app-inline
# Confirm that data has been printed on to the correct volume
sleep 10
OUTPUT=$(kubectl exec pod/my-csi-app-inline -- sh -c "cat /data/test")
PODUID=$(kubectl get pod my-csi-app-inline -o jsonpath='{.metadata.uid}')
MOUNTDIR="/var/lib/kubelet/pods/$PODUID/volumes/kubernetes.io~csi/my-csi-volume/"
VOLID=$(kubectl exec --filename deploy/latest/katbox/csi-katbox-plugin.yaml -c katbox -- sh -c "cat $MOUNTDIR/vol_data.json" | jq -r .volumeHandle)
echo "Volume ID: $VOLID"
echo "Mounted at: $MOUNTDIR"
sleep 10
if [ -z "$OUTPUT" ]; then
echo "FAILURE: No data found in test output";
fi
# Delete example app
kubectl delete -f examples/csi-app-inline.yaml
# Make sure mount point is gone
kubectl exec --filename deploy/latest/katbox/csi-katbox-plugin.yaml -c katbox -- sh -c "if [ -d ""$MOUNTDIR"" ]; then echo 'Error: Mount point still exists'; else echo ''; fi"
# Make sure folder allocated by katbox was deleted after 1 minutes
echo "Sleeping for 60 seconds to test if folder allocated by katbox was deleted"
sleep 60
kubectl exec --filename deploy/latest/katbox/csi-katbox-plugin.yaml -c katbox -- sh -c "if [ -d ""/csi-data-dir/$VOLID"" ]; then echo 'Error: Mount point still exists'; else echo ''; fi"
# Delete katbox daemon set
kubectl delete -f deploy/latest/katbox/csi-katbox-plugin.yaml
popd || exit

13
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#!/bin/bash
TMPDIR=$(mktemp -d)
pushd "$TMPDIR" || exit
docker save -o image.dockerimg $1
scp -i ~/.minikube/machines/minikube/id_rsa image.dockerimg docker@"$(minikube ip)":~/image.dockerimg
ssh -i ~/.minikube/machines/minikube/id_rsa docker@"$(minikube ip)" 'docker load -i ~/image.dockerimg'
popd || exit

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# a cluster with 3 control-plane nodes and 3 workers
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
- role: worker
- role: worker
- role: worker

58
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# CSI Hostpath driver
## Usage:
### Build hostpathplugin
```
$ make hostpath
```
### Start Hostpath driver
```
$ sudo ./_output/hostpathplugin --endpoint tcp://127.0.0.1:10000 --nodeid CSINode -v=5
```
### Test using csc
Get ```csc``` tool from https://github.com/rexray/gocsi/tree/master/csc
#### Get plugin info
```
$ csc identity plugin-info --endpoint tcp://127.0.0.1:10000
"csi-hostpath" "0.1.0"
```
#### Create a volume
```
$ csc controller new --endpoint tcp://127.0.0.1:10000 --cap 1,block CSIVolumeName
CSIVolumeID
```
#### Delete a volume
```
$ csc controller del --endpoint tcp://127.0.0.1:10000 CSIVolumeID
CSIVolumeID
```
#### Validate volume capabilities
```
$ csc controller validate-volume-capabilities --endpoint tcp://127.0.0.1:10000 --cap 1,block CSIVolumeID
CSIVolumeID true
```
#### NodePublish a volume
```
$ csc node publish --endpoint tcp://127.0.0.1:10000 --cap 1,block --target-path /mnt/hostpath CSIVolumeID
CSIVolumeID
```
#### NodeUnpublish a volume
```
$ csc node unpublish --endpoint tcp://127.0.0.1:10000 --target-path /mnt/hostpath CSIVolumeID
CSIVolumeID
```
#### Get NodeID
```
$ csc node get-id --endpoint tcp://127.0.0.1:10000
CSINode
```

191
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/*
Copyright 2020 PayPal.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package katbox
import (
"encoding/json"
"fmt"
"os"
"path/filepath"
"sync"
"time"
"github.com/ricochet2200/go-disk-usage/du"
bolt "go.etcd.io/bbolt"
"github.com/golang/glog"
)
type deletedVolumes struct {
candidates map[string]*deletionCandidate
storage *bolt.DB
lock sync.RWMutex
}
type deletionCandidate struct {
Time time.Time `json:"deleteTime"`
Lifespan time.Duration `json:"lifespan"`
Path string `json:"path"`
}
func (d *deletedVolumes) periodicCleanup(
done <-chan struct{},
interval time.Duration,
wg *sync.WaitGroup,
headroom float64,
workdir string,
) {
for {
select {
case <-done:
if err := d.storage.Close(); err != nil {
glog.Info("unable to close persistent storage ", err)
}
wg.Done()
return
default:
d.prune(workdir, headroom)
time.Sleep(interval)
}
}
}
func (d *deletedVolumes) queue(id string, vol deletionCandidate) {
// Check if an entry for deletion already exists
d.lock.RLock()
_, found := d.candidates[id]
d.lock.RUnlock()
if found {
return
}
// Write ahead persist to local storage the volume that will be entering our deletion queue
err := d.storage.Update(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(deletedVolumesBucketName))
if bucket == nil {
return fmt.Errorf("bucket %s does not exist", deletedVolumesBucketName)
}
marshaledVol, err := json.Marshal(vol)
if err != nil {
return fmt.Errorf("unable to serialize deletion candidate: %w", err)
}
err = bucket.Put([]byte(id), marshaledVol)
if err != nil {
return fmt.Errorf("unable to insert volume into database: %w", err)
}
return nil
})
if err != nil {
glog.Infof("failed to persist "+id+" at "+vol.Path, ": ", err)
return
}
d.lock.Lock()
defer d.lock.Unlock()
d.candidates[id] = &vol
}
func (d *deletedVolumes) remove(id string) {
err := d.storage.Update(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(deletedVolumesBucketName))
err := bucket.Delete([]byte(id))
if err != nil {
return fmt.Errorf("unable to delete %s from permanent storage: %s", id, err)
}
return nil
})
if err != nil {
glog.Infof("failed to remove "+id+": ", err)
return
}
d.lock.Lock()
defer d.lock.Unlock()
delete(d.candidates, id)
}
func (d *deletedVolumes) prune(workdir string, headroom float64) {
glog.V(2).Info("number of volumes queued for deletion: ", len(d.candidates))
// Only get the time once since this results in a syscall
// This may mean that some volumes may need to wait until next cycle to be pruned
currentTime := time.Now()
// Determine pressure factor based on underlying storage utilization
diskUsage := du.NewDiskUsage(workdir)
pressureFactor, err := pressureFactor(diskUsage.Size(), diskUsage.Free(), headroom)
if err != nil {
glog.Info("error calculating pressure factor, setting pressure factor to default value of 0.10 ", err)
pressureFactor = 0.1
}
glog.Info("disk pressure factor being used for this prune round: ", pressureFactor)
// Create a deep copy of the maps for safe reading
candidatesCopy := make(map[string]*deletionCandidate)
d.lock.RLock()
for id, vol := range d.candidates {
candidatesCopy[id] = vol
}
d.lock.RUnlock()
// Iterate over the copy of the candidates list since iterating over the original
// provides no concurrency safety and attempting to use locks leads to a deadlock in many code paths.
for id, vol := range candidatesCopy {
if vol == nil {
continue
}
if glog.V(5) {
glog.Infof("Deletion candidate volume ID: %v\n%+v", id, vol)
}
// Short circuit if the path doesn't exist
if _, err := os.Stat(vol.Path); os.IsNotExist(err) {
glog.Infof("removing %v from queue as path %v does not exist", id, vol.Path)
d.remove(id)
}
// Check to see if the current has passed the time when we need to evict this volume from
// the underlying storage. The point in time is a combination of the pressure factor
// and the configured afterlife duration.
if currentTime.After(vol.Time.Add(time.Duration(float64(vol.Lifespan) * pressureFactor))) {
err := os.RemoveAll(vol.Path)
if err != nil {
glog.Infof("unable to delete "+id+" at "+vol.Path, ": ", err)
continue
}
// Attempt to remove PodUUID directory if empty.
// We ignore the error here because this will correctly fail when a pod with multiple katbox volumes
// attempts to delete the parent directory. Only the last remaining volume being deleted should succeed.
_ = os.Remove(filepath.Dir(vol.Path))
glog.Infof("deleted " + id + " at " + vol.Path)
d.remove(id)
}
}
}

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/*
Copyright 2020 PayPal.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package katbox
import (
"sync"
"testing"
"time"
)
func TestDelete(t *testing.T) {
deleteQueue := deletedVolumes{candidates: make(map[string]*deletionCandidate), lock: sync.RWMutex{}}
deleteQueue.queue("volume1", deletionCandidate{
Time: time.Now(),
Lifespan: time.Second * 5,
Path: "/doesnt/exist",
})
deleteQueue.queue("vol2", deletionCandidate{
Time: time.Now(),
Lifespan: time.Second * 1,
Path: "/doesnt/exist2",
})
deleteQueue.queue("vol3", deletionCandidate{
Time: time.Now(),
Lifespan: time.Second * 3,
Path: "/doesnt/exist3",
})
for len(deleteQueue.candidates) > 0 {
deleteQueue.prune()
time.Sleep(time.Second * 1)
}
}

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/*
Copyright 2017 The Kubernetes Authors.
Modifications copyright 2020 PayPal.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package katbox
import (
"github.com/container-storage-interface/spec/lib/go/csi"
"github.com/golang/glog"
"golang.org/x/net/context"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type identityServer struct {
name string
version string
}
func NewIdentityServer(name, version string) *identityServer {
return &identityServer{
name: name,
version: version,
}
}
func (ids *identityServer) GetPluginInfo(ctx context.Context, req *csi.GetPluginInfoRequest) (*csi.GetPluginInfoResponse, error) {
glog.V(5).Infof("Using default GetPluginInfo")
if ids.name == "" {
return nil, status.Error(codes.Unavailable, "Driver name not configured")
}
if ids.version == "" {
return nil, status.Error(codes.Unavailable, "Driver is missing version")
}
return &csi.GetPluginInfoResponse{
Name: ids.name,
VendorVersion: ids.version,
}, nil
}
func (ids *identityServer) Probe(ctx context.Context, req *csi.ProbeRequest) (*csi.ProbeResponse, error) {
return &csi.ProbeResponse{}, nil
}
func (ids *identityServer) GetPluginCapabilities(ctx context.Context, req *csi.GetPluginCapabilitiesRequest) (*csi.GetPluginCapabilitiesResponse, error) {
glog.V(5).Infof("Using default capabilities")
return &csi.GetPluginCapabilitiesResponse{
Capabilities: []*csi.PluginCapability{
{
Type: &csi.PluginCapability_Service_{
Service: &csi.PluginCapability_Service{},
},
},
{
Type: &csi.PluginCapability_Service_{
Service: &csi.PluginCapability_Service{
Type: csi.PluginCapability_Service_VOLUME_ACCESSIBILITY_CONSTRAINTS,
},
},
},
},
}, nil
}

118
pkg/katbox/katbox.go Normal file
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/*
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package katbox
import (
"errors"
"fmt"
"os"
"sync"
"time"
"github.com/golang/glog"
)
type katbox struct {
name string
nodeID string
version string
endpoint string
pruneInterval time.Duration
headroom float64
idServer *identityServer
nodeServer *nodeServer
}
type volume struct {
Name string `json:"name"`
ID string `json:"id"`
PodUUID string `json:"podUUID"`
Size int64 `json:"size"`
Path string `json:"path"`
AccessType accessType `json:"accessType"`
ParentVolID string `json:"parentVolID,omitempty"`
Ephemeral bool `json:"ephemeral"`
}
var (
vendorVersion = "dev"
)
func NewKatboxDriver(
driverName, nodeID, endpoint, workdir string,
maxVolumesPerNode int64,
afterlifeSpan, deleteInterval time.Duration,
headroom float64,
version string) (*katbox, error) {
if driverName == "" {
return nil, errors.New("no driver name provided")
}
if nodeID == "" {
return nil, errors.New("no node id provided")
}
if endpoint == "" {
return nil, errors.New("no driver endpoint provided")
}
if version != "" {
vendorVersion = version
}
if err := os.MkdirAll(workdir, 0750); err != nil {
return nil, fmt.Errorf("failed to create working directory: %v", err)
}
glog.Infof("Driver: %v ", driverName)
glog.Infof("Version: %s", vendorVersion)
return &katbox{
name: driverName,
version: vendorVersion,
nodeID: nodeID,
endpoint: endpoint,
pruneInterval: deleteInterval,
headroom: headroom,
idServer: NewIdentityServer(driverName, version),
nodeServer: &nodeServer{node: NewNode(nodeID, workdir, maxVolumesPerNode, afterlifeSpan)},
}, nil
}
func (k *katbox) Run() {
if k.idServer == nil || k.nodeServer == nil || k.nodeServer.node == nil {
glog.V(1).Infof("unable to create server")
return
}
// Create GRPC servers
s := NewNonBlockingGRPCServer()
s.Start(k.endpoint, k.idServer, k.nodeServer)
// Start pruner as a go routine
endPrune := make(chan struct{})
wg := sync.WaitGroup{}
wg.Add(1)
go k.nodeServer.node.deletedVolumes.periodicCleanup(endPrune, k.pruneInterval, &wg, k.headroom, k.nodeServer.node.workdir)
// Wait for identity and node server to shut down
s.Wait()
// Signal to the pruner that it should clean up upon ending next loop
close(endPrune)
// Wait for pruner to signal that has finished cleaning up
wg.Wait()
}

230
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/*
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package katbox
import (
"encoding/json"
"errors"
"fmt"
"os"
"path"
"sync"
"time"
"github.com/golang/glog"
bolt "go.etcd.io/bbolt"
"k8s.io/kubernetes/pkg/volume/util/volumepathhandler"
utilexec "k8s.io/utils/exec"
)
type node struct {
id string
volumes map[string]volume
deletedVolumes deletedVolumes
workdir string
afterLifespan time.Duration
maxVolumes int64
storage *bolt.DB
}
func NewNode(id, workdir string, maxVolumes int64, afterLifespan time.Duration) *node {
db, err := initializePermanentStorage(
path.Join(workdir, "deletedVolumes.db"),
deletedVolumesBucketName,
volumesBucketName)
if err != nil {
return nil
}
candidates, err := loadDeletedVolumesFromPersistent(db, deletedVolumesBucketName)
if err != nil {
return nil
}
volumes, err := loadVolumesFromPersistent(db, volumesBucketName)
if err != nil {
return nil
}
glog.V(4).Infof("loaded %d volume records into memory", len(volumes))
return &node{
id: id,
volumes: volumes,
deletedVolumes: deletedVolumes{
candidates: candidates,
lock: sync.RWMutex{},
storage: db,
},
workdir: workdir,
afterLifespan: afterLifespan,
maxVolumes: maxVolumes,
storage: db,
}
}
func initializePermanentStorage(dbFilename string, bucketNames ...string) (*bolt.DB, error) {
db, err := bolt.Open(dbFilename, 0600, &bolt.Options{Timeout: 10 * time.Second})
if err != nil {
glog.V(4).Infof("unable to open persistent storage: %s", err)
return nil, err
}
err = db.Update(func(tx *bolt.Tx) error {
for _, name := range bucketNames {
_, err := tx.CreateBucketIfNotExists([]byte(name))
if err != nil {
return fmt.Errorf("unable to create bucket: %w", err)
}
}
return nil
})
if err != nil {
glog.V(4).Infof("unable to create bucket for storage: %s", err)
return nil, err
}
return db, nil
}
func loadDeletedVolumesFromPersistent(db *bolt.DB, bucketName string) (map[string]*deletionCandidate, error) {
if db == nil {
return nil, errors.New("database has not been initialized")
}
// Load list of volumes to be deleted from the persistent layer
candidates := make(map[string]*deletionCandidate)
err := db.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(bucketName))
if bucket == nil {
return fmt.Errorf("bucket %s doesn't exist", bucketName)
}
c := bucket.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
var candidate deletionCandidate
id := string(k)
if err := json.Unmarshal(v, &candidate); err != nil {
glog.V(1).Infof("unable to load volume %s: %s", id, err)
} else {
glog.V(4).Infof("loaded volume %s info into memory", id)
}
candidates[id] = &candidate
}
return nil
})
if err != nil {
glog.Info("unable load persistent layer into memory ", err)
return nil, err
}
return candidates, nil
}
func loadVolumesFromPersistent(db *bolt.DB, bucketName string) (map[string]volume, error) {
if db == nil {
return nil, errors.New("database has not been initialized")
}
// Load list of volumes to be deleted from the persistent layer
volumes := make(map[string]volume)
err := db.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(bucketName))
if bucket == nil {
return fmt.Errorf("bucket %s doesn't exist", bucketName)
}
c := bucket.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
var vol volume
id := string(k)
if err := json.Unmarshal(v, &vol); err != nil {
glog.V(1).Infof("unable to load volume %s: %s", id, err)
} else {
glog.V(4).Infof("loaded volume %s info into memory", id)
}
volumes[id] = vol
}
return nil
})
if err != nil {
glog.Info("unable load persistent layer into memory: ", err)
return nil, err
}
return volumes, nil
}
// createEphemeralVolume create the directory for the katbox volume.
// It returns the volume path or err if one occurs.
func (n *node) createEphemeralVolume(volID, podUUID, name string, cap int64, volAccessType accessType) (*volume, error) {
fullPath := fullpath(n.workdir, podUUID, volID)
switch volAccessType {
case mountAccess:
err := os.MkdirAll(fullPath, 0777)
if err != nil {
return nil, err
}
case blockAccess:
executor := utilexec.New()
size := fmt.Sprintf("%dM", cap/mib)
// Create a block file.
out, err := executor.Command("fallocate", "-l", size, fullPath).CombinedOutput()
if err != nil {
return nil, fmt.Errorf("failed to create block device: %v, %v", err, string(out))
}
// Associate block file with the loop device.
volPathHandler := volumepathhandler.VolumePathHandler{}
_, err = volPathHandler.AttachFileDevice(fullPath)
if err != nil {
// Remove the block file because it'll no longer be used again.
if err2 := os.Remove(fullPath); err2 != nil {
glog.Errorf("failed to cleanup block file %s: %v", fullPath, err2)
}
return nil, fmt.Errorf("failed to attach device %v: %v", fullPath, err)
}
default:
return nil, fmt.Errorf("unsupported access type %v", volAccessType)
}
vol := volume{
Name: name,
ID: volID,
PodUUID: podUUID,
Size: cap,
Path: fullPath,
AccessType: volAccessType,
Ephemeral: true,
}
n.volumes[volID] = vol
return &vol, nil
}
func (n *node) volumeByID(id string) (volume, error) {
if vol, ok := n.volumes[id]; ok {
return vol, nil
}
return volume{}, fmt.Errorf("volume id %s does not exist in the volumes list", id)
}

358
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/*
Copyright 2017 The Kubernetes Authors.
Modifications copyright 2020 PayPal.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package katbox
import (
"encoding/json"
"fmt"
"os"
"strings"
"time"
"github.com/container-storage-interface/spec/lib/go/csi"
"github.com/golang/glog"
"golang.org/x/net/context"
bolt "go.etcd.io/bbolt"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"k8s.io/kubernetes/pkg/volume/util/volumepathhandler"
"k8s.io/mount-utils"
)
const TopologyKeyNode = "topology.katbox.csi/node"
type nodeServer struct {
node *node
}
func (ns *nodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublishVolumeRequest) (*csi.NodePublishVolumeResponse, error) {
// Check arguments
if req.GetVolumeCapability() == nil {
return nil, status.Error(codes.InvalidArgument, "volume capability missing in request")
}
if len(req.GetVolumeId()) == 0 {
return nil, status.Error(codes.InvalidArgument, "volume ID missing in request")
}
if len(req.GetTargetPath()) == 0 {
return nil, status.Error(codes.InvalidArgument, "target path missing in request")
}
targetPath := req.GetTargetPath()
// Kubernetes 1.15 doesn't have csi.storage.k8s.io/ephemeral.
ephemeralVolume := req.GetVolumeContext()[ephemeralContext] == "true"
podUUID := req.GetVolumeContext()[podUUIDContext]
if !ephemeralVolume {
return nil, status.Error(codes.InvalidArgument, "this CSI driver only supports ephemeral volumes")
}
if req.GetVolumeCapability().GetBlock() != nil &&
req.GetVolumeCapability().GetMount() != nil {
return nil, status.Error(codes.InvalidArgument, "volume cannot be of both block and mount access type")
}
volID := req.GetVolumeId()
volName := fmt.Sprintf("ephemeral-%s", volID)
ephVol, err := ns.node.createEphemeralVolume(req.GetVolumeId(), podUUID, volName, maxStorageCapacity, mountAccess)
if err != nil && !os.IsExist(err) {
glog.Error("failed to create ephemeral volume: ", err)
return nil, status.Error(codes.Internal, err.Error())
}
glog.V(4).Infof("created ephemeral volume: %s", ephVol.Path)
vol, err := ns.node.volumeByID(req.GetVolumeId())
if err != nil {
return nil, status.Error(codes.NotFound, err.Error())
}
if req.GetVolumeCapability().GetBlock() != nil {
if vol.AccessType != blockAccess {
return nil, status.Error(codes.InvalidArgument, "cannot publish a non-block volume as block volume")
}
volPathHandler := volumepathhandler.VolumePathHandler{}
// Get loop device from the volume path.
loopDevice, err := volPathHandler.GetLoopDevice(vol.Path)
if err != nil {
return nil, status.Error(codes.Internal, fmt.Sprintf("failed to get the loop device: %v", err))
}
mounter := mount.New("")
// Check if the target path exists. Create if not present.
_, err = os.Lstat(targetPath)
if os.IsNotExist(err) {
if err = makeFile(targetPath); err != nil {
return nil, status.Error(codes.Internal, fmt.Sprintf("failed to create target path: %s: %v", targetPath, err))
}
}
if err != nil {
return nil, status.Errorf(codes.Internal, "failed to check if the target block file exists: %v", err)
}
// Check if the target path is already mounted. Prevent remounting.
notMount, err := mount.IsNotMountPoint(mounter, targetPath)
if err != nil {
if !os.IsNotExist(err) {
return nil, status.Errorf(codes.Internal, "error checking path %s for mount: %s", targetPath, err)
}
notMount = true
}
if !notMount {
// It's already mounted.
glog.V(5).Infof("Skipping bind-mounting subpath %s: already mounted", targetPath)
return &csi.NodePublishVolumeResponse{}, nil
}
if err := mount.New("").Mount(loopDevice, targetPath, "", []string{"bind"}); err != nil {
return nil, status.Error(codes.Internal, fmt.Sprintf("failed to mount block device: %s at %s: %v", loopDevice, targetPath, err))
}
} else if req.GetVolumeCapability().GetMount() != nil {
if vol.AccessType != mountAccess {
return nil, status.Error(codes.InvalidArgument, "cannot publish a non-mount volume as mount volume")
}
notMnt, err := mount.IsNotMountPoint(mount.New(""),targetPath)
if err != nil {
if os.IsNotExist(err) {
if err = os.MkdirAll(targetPath, 0750); err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
notMnt = true
} else {
return nil, status.Error(codes.Internal, err.Error())
}
}
if !notMnt {
return &csi.NodePublishVolumeResponse{}, nil
}
fsType := req.GetVolumeCapability().GetMount().GetFsType()
deviceId := ""
if req.GetPublishContext() != nil {
deviceId = req.GetPublishContext()[deviceID]
}
readOnly := req.GetReadonly()
volumeId := req.GetVolumeId()
attrib := req.GetVolumeContext()
mountFlags := req.GetVolumeCapability().GetMount().GetMountFlags()
glog.V(4).Infof(
"target %v\nfstype %v\ndevice %v\nreadonly %v\nvolumeId %v\nattributes %v\nmountflags %v\n",
targetPath,
fsType,
deviceId,
readOnly,
volumeId,
attrib,
mountFlags,
)
options := []string{"bind"}
if readOnly {
options = append(options, "ro")
}
mounter := mount.New("")
volumePath := fullpath(ns.node.workdir, podUUID, volumeId)
if err := mounter.Mount(volumePath, targetPath, "", options); err != nil {
var errList strings.Builder
errList.WriteString(err.Error())
if vol.Ephemeral {
if rmErr := os.RemoveAll(volumePath); rmErr != nil && !os.IsNotExist(rmErr) {
errList.WriteString(fmt.Sprintf(" :%s", rmErr.Error()))
}
}
return nil, status.Error(codes.Internal, fmt.Sprintf("failed to mount device: %s at %s: %s", volumePath, targetPath, errList.String()))
}
} else {
return nil, status.Error(codes.InvalidArgument, "volume must be of block or mount access type")
}
// Persist newly created ephemeral volume into storage due to the fact that we need the PodUUID information
// when deleting this object.
err = ns.node.storage.Update(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(volumesBucketName))
if bucket == nil {
return fmt.Errorf("bucket %s does not exist", volumesBucketName)
}
marshaledVol, err := json.Marshal(*ephVol)
if err != nil {
return fmt.Errorf("unable to serialize deletion candidate: %w", err)
}
err = bucket.Put([]byte(volID), marshaledVol)
if err != nil {
return fmt.Errorf("unable to insert volume %s into database: %w", volID, err)
}
return nil
})
if err != nil {
glog.Errorf("Unable to persist volume %s: %s", volID, err)
}
return &csi.NodePublishVolumeResponse{}, nil
}
func (ns *nodeServer) NodeUnpublishVolume(ctx context.Context, req *csi.NodeUnpublishVolumeRequest) (*csi.NodeUnpublishVolumeResponse, error) {
// Validate the request that was sent
if len(req.GetVolumeId()) == 0 {
return nil, status.Error(codes.InvalidArgument, "volume ID missing in request")
}
if len(req.GetTargetPath()) == 0 {
return nil, status.Error(codes.InvalidArgument, "target path missing in request")
}
var vol volume
var err error
targetPath := req.GetTargetPath()
volumeID := req.GetVolumeId()
vol, err = ns.node.volumeByID(volumeID)
if err != nil {
glog.V(4).Infof("handling deletion for volume %v even though it was not found in memory", volumeID)
} else if !vol.Ephemeral {
glog.Warningf("handling deletion for volume %v even though it is not ephemeral", vol)
}
// Queue folder that was previously mounted on to pod for deletion. Note that this is different
// than the point where the folder was bind mounted to.
ns.node.deletedVolumes.queue(
volumeID,
deletionCandidate{
Time: time.Now(),
Lifespan: ns.node.afterLifespan,
Path: fullpath(ns.node.workdir, vol.PodUUID, volumeID),
},
)
// Unmount only if the target path is really a mount point.
// This will not delete the underlying data stored in the working directory.
notMnt, err := mount.IsNotMountPoint(mount.New(""), targetPath)
if err != nil {
if !os.IsNotExist(err) {
return nil, status.Error(codes.Internal, err.Error())
}
} else if !notMnt {
// Un-mounting the image or filesystem.
err = mount.New("").Unmount(targetPath)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
}
if vol.AccessType == blockAccess {
return nil, fmt.Errorf("block access is unsupported by this driver")
}
// Delete persisted volume information
err = ns.node.storage.Update(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(volumesBucketName))
err := bucket.Delete([]byte(volumeID))
if err != nil {
return fmt.Errorf("unable to delete %s from permanent storage: %s", volumeID, err)
}
return nil
})
if err != nil {
glog.Error(err)
}
delete(ns.node.volumes, volumeID)
// Since we've already successfully queued the local volume for deletion, we return
// a payload indicating that the delete request was successful. The actual deletion from the local
// disk will take place at a later time.
// TODO(rdelvalle): Since we always tell k8s that we've been successful in removing the disk, we can run into
// an inconsistency issue when we are unable to delete a volume. Explore options to handle this.
return &csi.NodeUnpublishVolumeResponse{}, nil
}
func (ns *nodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVolumeRequest) (*csi.NodeStageVolumeResponse, error) {
if len(req.GetVolumeId()) == 0 {
return nil, status.Error(codes.InvalidArgument, "Volume ID missing in request")
}
if len(req.GetStagingTargetPath()) == 0 {
return nil, status.Error(codes.InvalidArgument, "Target path missing in request")
}
if req.GetVolumeCapability() == nil {
return nil, status.Error(codes.InvalidArgument, "Volume Capability missing in request")
}
return &csi.NodeStageVolumeResponse{}, nil
}
func (ns *nodeServer) NodeUnstageVolume(ctx context.Context, req *csi.NodeUnstageVolumeRequest) (*csi.NodeUnstageVolumeResponse, error) {
if len(req.GetVolumeId()) == 0 {
return nil, status.Error(codes.InvalidArgument, "Volume ID missing in request")
}
if len(req.GetStagingTargetPath()) == 0 {
return nil, status.Error(codes.InvalidArgument, "Target path missing in request")
}
return &csi.NodeUnstageVolumeResponse{}, nil
}
func (ns *nodeServer) NodeGetInfo(ctx context.Context, req *csi.NodeGetInfoRequest) (*csi.NodeGetInfoResponse, error) {
topology := &csi.Topology{
Segments: map[string]string{TopologyKeyNode: ns.node.id},
}
return &csi.NodeGetInfoResponse{
NodeId: ns.node.id,
MaxVolumesPerNode: ns.node.maxVolumes,
AccessibleTopology: topology,
}, nil
}
func (ns *nodeServer) NodeGetCapabilities(ctx context.Context, req *csi.NodeGetCapabilitiesRequest) (*csi.NodeGetCapabilitiesResponse, error) {
return &csi.NodeGetCapabilitiesResponse{
Capabilities: []*csi.NodeServiceCapability{
{
Type: &csi.NodeServiceCapability_Rpc{
Rpc: &csi.NodeServiceCapability_RPC{},
},
},
},
}, nil
}
func (ns *nodeServer) NodeGetVolumeStats(ctx context.Context, in *csi.NodeGetVolumeStatsRequest) (*csi.NodeGetVolumeStatsResponse, error) {
return nil, status.Error(codes.Unimplemented, "")
}
// NodeExpandVolume is only implemented so the driver can be used for e2e testing.
func (ns *nodeServer) NodeExpandVolume(ctx context.Context, req *csi.NodeExpandVolumeRequest) (*csi.NodeExpandVolumeResponse, error) {
return nil, status.Error(codes.Unimplemented, "")
}

125
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/*
Copyright 2019 The Kubernetes Authors.
Modifications copyright 2020 PayPal.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package katbox
import (
"fmt"
"net"
"os"
"strings"
"sync"
"github.com/container-storage-interface/spec/lib/go/csi"
"github.com/golang/glog"
"github.com/kubernetes-csi/csi-lib-utils/protosanitizer"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
func NewNonBlockingGRPCServer() *nonBlockingGRPCServer {
return &nonBlockingGRPCServer{}
}
// NonBlocking server
type nonBlockingGRPCServer struct {
wg sync.WaitGroup
server *grpc.Server
}
func (s *nonBlockingGRPCServer) Start(endpoint string, ids csi.IdentityServer, ns csi.NodeServer) {
s.wg.Add(1)
go s.serve(endpoint, ids, ns)
return
}
func (s *nonBlockingGRPCServer) Wait() {
s.wg.Wait()
}
func (s *nonBlockingGRPCServer) Stop() {
s.server.GracefulStop()
}
func (s *nonBlockingGRPCServer) ForceStop() {
s.server.Stop()
}
func (s *nonBlockingGRPCServer) serve(endpoint string, ids csi.IdentityServer, ns csi.NodeServer) {
proto, addr, err := parseEndpoint(endpoint)
if err != nil {
glog.Fatal(err.Error())
}
if proto == "unix" {
addr = "/" + addr
if err := os.Remove(addr); err != nil && !os.IsNotExist(err) { //nolint: vetshadow
glog.Fatalf("Failed to remove %s, error: %s", addr, err.Error())
}
}
listener, err := net.Listen(proto, addr)
if err != nil {
glog.Fatalf("Failed to listen: %v", err)
}
opts := []grpc.ServerOption{
grpc.UnaryInterceptor(logGRPC),
}
server := grpc.NewServer(opts...)
s.server = server
if ids != nil {
csi.RegisterIdentityServer(server, ids)
}
if ns != nil {
csi.RegisterNodeServer(server, ns)
}
glog.Infof("Listening for connections on address: %#v", listener.Addr())
server.Serve(listener)
}
func parseEndpoint(ep string) (string, string, error) {
if strings.HasPrefix(strings.ToLower(ep), "unix://") || strings.HasPrefix(strings.ToLower(ep), "tcp://") {
s := strings.SplitN(ep, "://", 2)
if s[1] != "" {
return s[0], s[1], nil
}
}
return "", "", fmt.Errorf("invalid endpoint: %v", ep)
}
func logGRPC(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
glog.V(5).Infof("GRPC call: %s", info.FullMethod)
glog.V(5).Infof("GRPC request: %+v", protosanitizer.StripSecrets(req))
resp, err := handler(ctx, req)
if err != nil {
glog.Errorf("GRPC error: %v", err)
} else {
glog.V(5).Infof("GRPC response: %+v", protosanitizer.StripSecrets(resp))
}
return resp, err
}

47
pkg/katbox/types.go Normal file
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/*
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package katbox
const (
deviceID = "deviceID"
maxStorageCapacity = tib
)
// Storage sizes
const (
kib int64 = 1024
mib int64 = kib * 1024
gib int64 = mib * 1024
gib100 int64 = gib * 100
tib int64 = gib * 1024
tib100 int64 = tib * 100
)
type accessType int
const (
mountAccess accessType = iota
blockAccess
)
// Available contexts for volume
const (
podUUIDContext = "csi.storage.k8s.io/pod.uid"
ephemeralContext = "csi.storage.k8s.io/ephemeral"
)
const (
volumesBucketName = "volumes"
deletedVolumesBucketName = "deletedVolumes"
)

73
pkg/katbox/util.go Normal file
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/*
Copyright 2020 PayPal.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package katbox
import (
"errors"
"math"
"os"
"path/filepath"
"github.com/golang/glog"
)
// fullpath returns the location where the katbox volume will be created inside the container
// running the katbox plugin
func fullpath(workdir, podUUID, p string) string {
return filepath.Join(workdir, podUUID, p)
}
// pressureFactor returns a value to be used with afterlife calculations.
// The more space we're using in the head room, the more aggressive the early eviction should be.
// Therefore, as the the ratio of headroom space available diminishes, our ratio gets lower and lower.
// Since we will be multiplying by a type time.Duration which is added to the deletion time, we multiply by
// the complement of the percentage of used headroom.
// e.g:
// 40% of our headroom is being used. Therefore we need to reduce the afterlife by 40% (use 60% of afterlife).
// e.g: 600 seconds * .60 = 360 seconds.
// Thus when we check if we should evict, the calculation will be done using 360 seconds after the delete
// happened instead of 600 after the delete happened.
// This concept is inspired by the Apache Mesos disk pressure feature.
func pressureFactor(total, free uint64, headroom float64) (float64, error) {
if headroom < 0.0 || headroom > 1.0 {
return 0, errors.New("headroom must be a value between 0 and 1.0 (inclusive)")
}
headroomSpace := uint64(math.Ceil(float64(total) * headroom))
glog.V(5).Infof("Total Size: %v\nTotal Free: %v\nTotal Headroom Space: %v", total, free, headroomSpace)
if free >= headroomSpace {
return 1.0, nil
}
// Determines how far into the headroom space we currently are and returns the inverse as that's how
// much of the afterlife we should be using.
return 1.0 - float64(headroomSpace-free)/float64(headroomSpace), nil
}
// makeFile ensures that the file exists, creating it if necessary.
// The parent directory must exist.
func makeFile(pathname string) error {
f, err := os.OpenFile(pathname, os.O_CREATE, os.FileMode(0644))
defer f.Close()
if err != nil {
if !os.IsExist(err) {
return err
}
}
return nil
}

51
pkg/katbox/util_test.go Normal file
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/*
Copyright 2020 PayPal.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package katbox
import (
"testing"
"github.com/stretchr/testify/assert"
)
func Test_pressureFactor(t *testing.T) {
tests := []struct {
name string
total uint64
free uint64
headroom float64
expectedFactor float64
expectErr bool
}{
{"underUsage", 1000, 110, .10, 1.0, false},
{"overUsage", 1000, 99, .10, .99, false},
{"atUsage", 1000, 100, .10, 1.0, false},
{"negativeHeadroom", 1000, 100, -.10, 0.0, true},
{"greaterThan100", 1000, 100, 10, 0.0, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
pf, err := pressureFactor(tt.total, tt.free, tt.headroom)
if tt.expectErr {
assert.Error(t, err, "expected an error")
} else {
assert.EqualValues(t, tt.expectedFactor, pf, "Incorrect pressure factor")
assert.NoError(t, err, "unexpected error")
}
})
}
}

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stream/Dockerfile Normal file
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#Build from golang alpine as base image and add build base
FROM golang:1.16.0-alpine3.13 as golangbase
RUN apk add build-base
LABEL maintainer="The Katbox Authors"
WORKDIR /app
# Copy the source from the current directory to the Working Directory inside the container
COPY . .
RUN go mod download
RUN go build -o main .
#Start a new stage from scratch (multistage build)
FROM alpine:latest
RUN apk --no-cache add ca-certificates
WORKDIR /root/
# Copy the Pre-built binary file from the previous stage
COPY --from=golangbase /app/main .
#TODO:@revanth this port needs to updated before deploying on the cluster if needed
EXPOSE 5051
CMD ["./main"]

232
stream/docs/docs.go Normal file
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// swag init
// Package docs GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
// This file was generated by swaggo/swag
package docs
import (
"bytes"
"encoding/json"
"strings"
"text/template"
"github.com/swaggo/swag"
)
var doc = `{
"schemes": {{ marshal .Schemes }},
"swagger": "2.0",
"info": {
"description": "{{.Description}}",
"title": "{{.Title}}",
"contact": {
"name": "Revanth Chandra",
},
"version": "{{.Version}}"
},
"host": "{{.Host}}",
"basePath": "{{.BasePath}}",
"paths": {
"/files/browse": {
"get": {
"description": "serves sandbox logs filesystem as a json object",
"consumes": [
"application/json"
],
"produces": [
"application/json"
],
"summary": "Browse Filesystem",
"parameters": [
{
"type": "string",
"description": "Path",
"name": "path",
"in": "query",
"required": true
}
],
"responses": {
"200": {
"description": "OK",
"schema": {
"$ref": "#/definitions/main.Result"
}
}
}
}
},
"/files/download": {
"get": {
"description": "Download any file from sandbox logs filesystem",
"consumes": [
"application/json"
],
"produces": [
"application/octet-stream"
],
"summary": "Download a file from Filesystem",
"parameters": [
{
"type": "string",
"description": "Path",
"name": "path",
"in": "query",
"required": true
}
],
"responses": {
"200": {
"description": "OK",
"schema": {
"$ref": "#/definitions/main.StreamData"
}
}
}
}
},
"/files/read": {
"get": {
"description": "Reads any file from sandbox logs filesystem and serves as a json object",
"consumes": [
"application/json"
],
"summary": "Read a file from Filesystem",
"parameters": [
{
"type": "string",
"description": "Path",
"name": "path",
"in": "query",
"required": true
},
{
"type": "integer",
"description": "Offset",
"name": "offset",
"in": "query",
"required": true
},
{
"type": "integer",
"description": "Length",
"name": "length",
"in": "query",
"required": true
},
{
"type": "string",
"description": "jsonp",
"name": "jsonp",
"in": "query",
"required": true
}
],
"responses": {
"200": {
"description": "OK",
"schema": {
"$ref": "#/definitions/main.StreamData"
}
}
}
}
}
},
"definitions": {
"main.FileInformation": {
"type": "object",
"properties": {
"gid": {
"type": "string"
},
"mode": {
"type": "string"
},
"mtime": {
"type": "string"
},
"nlink": {
"type": "string"
},
"path": {
"type": "string"
},
"size": {
"type": "string"
},
"uid": {
"type": "string"
}
}
},
"main.Result": {
"type": "object",
"properties": {
"data": {
"type": "array",
"items": {
"$ref": "#/definitions/main.FileInformation"
}
}
}
},
"main.StreamData": {
"type": "object",
"properties": {
"data": {
"type": "string"
},
"offset": {
"type": "integer"
}
}
}
}
}`
type swaggerInfo struct {
Version string
Host string
BasePath string
Schemes []string
Title string
Description string
}
// SwaggerInfo holds exported Swagger Info so clients can modify it
var SwaggerInfo = swaggerInfo{
Version: "1.0",
Host: "localhost:8080",
BasePath: "/",
Schemes: []string{},
Title: "k8s Sandbox Go Restful API with Swagger",
Description: "Rest API doc for sandbox API's",
}
type s struct{}
func (s *s) ReadDoc() string {
sInfo := SwaggerInfo
sInfo.Description = strings.Replace(sInfo.Description, "\n", "\\n", -1)
t, err := template.New("swagger_info").Funcs(template.FuncMap{
"marshal": func(v interface{}) string {
a, _ := json.Marshal(v)
return string(a)
},
}).Parse(doc)
if err != nil {
return doc
}
var tpl bytes.Buffer
if err := t.Execute(&tpl, sInfo); err != nil {
return doc
}
return tpl.String()
}
func init() {
swag.Register(swag.Name, &s{})
}

170
stream/docs/swagger.json Normal file
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@ -0,0 +1,170 @@
{
"swagger": "2.0",
"info": {
"description": "Rest API doc for sandbox API's",
"title": "k8s Sandbox Go Restful API with Swagger",
"contact": {
"name": "Revanth Chandra",
},
"version": "1.0"
},
"host": "localhost:8080",
"basePath": "/",
"paths": {
"/files/browse": {
"get": {
"description": "serves sandbox logs filesystem as a json object",
"consumes": [
"application/json"
],
"produces": [
"application/json"
],
"summary": "Browse Filesystem",
"parameters": [
{
"type": "string",
"description": "Path",
"name": "path",
"in": "query",
"required": true
}
],
"responses": {
"200": {
"description": "OK",
"schema": {
"$ref": "#/definitions/main.Result"
}
}
}
}
},
"/files/download": {
"get": {
"description": "Download any file from sandbox logs filesystem",
"consumes": [
"application/json"
],
"produces": [
"application/octet-stream"
],
"summary": "Download a file from Filesystem",
"parameters": [
{
"type": "string",
"description": "Path",
"name": "path",
"in": "query",
"required": true
}
],
"responses": {
"200": {
"description": "OK",
"schema": {
"$ref": "#/definitions/main.StreamData"
}
}
}
}
},
"/files/read": {
"get": {
"description": "Reads any file from sandbox logs filesystem and serves as a json object",
"consumes": [
"application/json"
],
"summary": "Read a file from Filesystem",
"parameters": [
{
"type": "string",
"description": "Path",
"name": "path",
"in": "query",
"required": true
},
{
"type": "integer",
"description": "Offset",
"name": "offset",
"in": "query",
"required": true
},
{
"type": "integer",
"description": "Length",
"name": "length",
"in": "query",
"required": true
},
{
"type": "string",
"description": "jsonp",
"name": "jsonp",
"in": "query",
"required": true
}
],
"responses": {
"200": {
"description": "OK",
"schema": {
"$ref": "#/definitions/main.StreamData"
}
}
}
}
}
},
"definitions": {
"main.FileInformation": {
"type": "object",
"properties": {
"gid": {
"type": "string"
},
"mode": {
"type": "string"
},
"mtime": {
"type": "string"
},
"nlink": {
"type": "string"
},
"path": {
"type": "string"
},
"size": {
"type": "string"
},
"uid": {
"type": "string"
}
}
},
"main.Result": {
"type": "object",
"properties": {
"data": {
"type": "array",
"items": {
"$ref": "#/definitions/main.FileInformation"
}
}
}
},
"main.StreamData": {
"type": "object",
"properties": {
"data": {
"type": "string"
},
"offset": {
"type": "integer"
}
}
}
}
}

113
stream/docs/swagger.yaml Normal file
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@ -0,0 +1,113 @@
basePath: /
definitions:
main.FileInformation:
properties:
gid:
type: string
mode:
type: string
mtime:
type: string
nlink:
type: string
path:
type: string
size:
type: string
uid:
type: string
type: object
main.Result:
properties:
data:
items:
$ref: '#/definitions/main.FileInformation'
type: array
type: object
main.StreamData:
properties:
data:
type: string
offset:
type: integer
type: object
host: localhost:8080
info:
contact:
name: Revanth Chandra
description: Rest API doc for sandbox API's
title: k8s Sandbox Go Restful API with Swagger
version: "1.0"
paths:
/files/browse:
get:
consumes:
- application/json
description: serves sandbox logs filesystem as a json object
parameters:
- description: Path
in: query
name: path
required: true
type: string
produces:
- application/json
responses:
"200":
description: OK
schema:
$ref: '#/definitions/main.Result'
summary: Browse Filesystem
/files/download:
get:
consumes:
- application/json
description: Download any file from sandbox logs filesystem
parameters:
- description: Path
in: query
name: path
required: true
type: string
produces:
- application/octet-stream
responses:
"200":
description: OK
schema:
$ref: '#/definitions/main.StreamData'
summary: Download a file from Filesystem
/files/read:
get:
consumes:
- application/json
description: Reads any file from sandbox logs filesystem and serves as a json
object
parameters:
- description: Path
in: query
name: path
required: true
type: string
- description: Offset
in: query
name: offset
required: true
type: integer
- description: Length
in: query
name: length
required: true
type: integer
- description: jsonp
in: query
name: jsonp
required: true
type: string
responses:
"200":
description: OK
schema:
$ref: '#/definitions/main.StreamData'
summary: Read a file from Filesystem
swagger: "2.0"

9
stream/go.mod Normal file
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@ -0,0 +1,9 @@
module stream
go 1.16
require (
github.com/swaggo/http-swagger v1.0.0 // indirect
github.com/swaggo/swag v1.7.0 // indirect
golang.org/x/tools v0.1.0 // indirect
)

97
stream/go.sum Normal file
View file

@ -0,0 +1,97 @@
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/KyleBanks/depth v1.2.1 h1:5h8fQADFrWtarTdtDudMmGsC7GPbOAu6RVB3ffsVFHc=
github.com/KyleBanks/depth v1.2.1/go.mod h1:jzSb9d0L43HxTQfT+oSA1EEp2q+ne2uh6XgeJcm8brE=
github.com/PuerkitoBio/purell v1.1.1 h1:WEQqlqaGbrPkxLJWfBwQmfEAE1Z7ONdDLqrN38tNFfI=
github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 h1:d+Bc7a5rLufV/sSk/8dngufqelfh6jnri85riMAaF/M=
github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
github.com/go-chi/chi v4.0.2+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
github.com/go-openapi/jsonpointer v0.19.3/go.mod h1:Pl9vOtqEWErmShwVjC8pYs9cog34VGT37dQOVbmoatg=
github.com/go-openapi/jsonpointer v0.19.5 h1:gZr+CIYByUqjcgeLXnQu2gHYQC9o73G2XUeOFYEICuY=
github.com/go-openapi/jsonpointer v0.19.5/go.mod h1:Pl9vOtqEWErmShwVjC8pYs9cog34VGT37dQOVbmoatg=
github.com/go-openapi/jsonreference v0.19.4/go.mod h1:RdybgQwPxbL4UEjuAruzK1x3nE69AqPYEJeo/TWfEeg=
github.com/go-openapi/jsonreference v0.19.5 h1:1WJP/wi4OjB4iV8KVbH73rQaoialJrqv8gitZLxGLtM=
github.com/go-openapi/jsonreference v0.19.5/go.mod h1:RdybgQwPxbL4UEjuAruzK1x3nE69AqPYEJeo/TWfEeg=
github.com/go-openapi/spec v0.19.14/go.mod h1:gwrgJS15eCUgjLpMjBJmbZezCsw88LmgeEip0M63doA=
github.com/go-openapi/spec v0.20.0 h1:HGLc8AJ7ynOxwv0Lq4TsnwLsWMawHAYiJIFzbcML86I=
github.com/go-openapi/spec v0.20.0/go.mod h1:+81FIL1JwC5P3/Iuuozq3pPE9dXdIEGxFutcFKaVbmU=
github.com/go-openapi/swag v0.19.5/go.mod h1:POnQmlKehdgb5mhVOsnJFsivZCEZ/vjK9gh66Z9tfKk=
github.com/go-openapi/swag v0.19.11/go.mod h1:Uc0gKkdR+ojzsEpjh39QChyu92vPgIr72POcgHMAgSY=
github.com/go-openapi/swag v0.19.12 h1:Bc0bnY2c3AoF7Gc+IMIAQQsD8fLHjHpc19wXvYuayQI=
github.com/go-openapi/swag v0.19.12/go.mod h1:eFdyEBkTdoAf/9RXBvj4cr1nH7GD8Kzo5HTt47gr72M=
github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY=
github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
github.com/mailru/easyjson v0.0.0-20190614124828-94de47d64c63/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
github.com/mailru/easyjson v0.0.0-20190626092158-b2ccc519800e/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
github.com/mailru/easyjson v0.7.6 h1:8yTIVnZgCoiM1TgqoeTl+LfU5Jg6/xL3QhGQnimLYnA=
github.com/mailru/easyjson v0.7.6/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc=
github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/swaggo/files v0.0.0-20190704085106-630677cd5c14 h1:PyYN9JH5jY9j6av01SpfRMb+1DWg/i3MbGOKPxJ2wjM=
github.com/swaggo/files v0.0.0-20190704085106-630677cd5c14/go.mod h1:gxQT6pBGRuIGunNf/+tSOB5OHvguWi8Tbt82WOkf35E=
github.com/swaggo/http-swagger v1.0.0 h1:ksYgVBCYmAaxFsGVGojlPROgYfiQQSllETTWMtHJHTo=
github.com/swaggo/http-swagger v1.0.0/go.mod h1:cKIcshBU9yEAnfWv6ZzVKSsEf8h5ozxB8/zHQWyOQ/8=
github.com/swaggo/swag v1.7.0 h1:5bCA/MTLQoIqDXXyHfOpMeDvL9j68OY/udlK4pQoo4E=
github.com/swaggo/swag v1.7.0/go.mod h1:BdPIL73gvS9NBsdi7M1JOxLvlbfvNRaBP8m6WT6Aajo=
github.com/urfave/cli/v2 v2.3.0/go.mod h1:LJmUH05zAU44vOAcrfzZQKsZbVcdbOG8rtL3/XcUArI=
github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/mod v0.3.0 h1:RM4zey1++hCTbCVQfnWeKs9/IEsaBLA8vTkd0WVtmH4=
golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
golang.org/x/net v0.0.0-20201207224615-747e23833adb h1:xj2oMIbduz83x7tzglytWT7spn6rP+9hvKjTpro6/pM=
golang.org/x/net v0.0.0-20201207224615-747e23833adb/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4 h1:myAQVi0cGEoqQVR5POX+8RR2mrocKqNN1hmeMqhX27k=
golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.4 h1:0YWbFKbhXG/wIiuHDSKpS0Iy7FSA+u45VtBMfQcFTTc=
golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.0.0-20201120155355-20be4ac4bd6e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
golang.org/x/tools v0.0.0-20201208062317-e652b2f42cc7 h1:2OSu5vYyX4LVqZAtqZXnFEcN26SDKIJYlEVIRl1tj8U=
golang.org/x/tools v0.0.0-20201208062317-e652b2f42cc7/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
golang.org/x/tools v0.1.0 h1:po9/4sTYwZU9lPhi1tOrb4hCv3qrhiQ77LZfGa2OjwY=
golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

23
stream/k8s.yaml Normal file
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@ -0,0 +1,23 @@
#---#
#k8s-base.yaml
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: streamserver
spec:
replicas: 1
selector:
matchLabels:
app: streamserver
template:
metadata:
labels:
app: streamserver
spec:
containers:
- name: streamserver
image: streamserver:latest
imagePullPolicy: IfNotPresent
ports:
- containerPort: 8080

347
stream/main.go Normal file
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@ -0,0 +1,347 @@
package main
/*
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <stdlib.h>
*/
import "C"
import (
"encoding/json"
"fmt"
"io"
"log"
"math"
"net/http"
"os"
"os/user"
"path/filepath"
"strconv"
_ "stream/docs"
"strings"
"syscall"
httpSwagger "github.com/swaggo/http-swagger"
)
type StreamData struct {
Data string `json:"data"`
Offset int64 `json:"offset"`
}
type FileInformation struct {
Mode string `json:"mode"`
Nlink string `json:"nlink"`
UID string `json:"uid"`
GID string `json:"gid"`
Size string `json:"size"`
Mtime int64 `json:"mtime"`
Path string `json:"path"`
}
type Result struct {
Data []FileInformation `json:"data`
}
type Error struct {
Error string `json:"error"`
}
// Download a file from sandbox filesystem with given offset and length godoc
// @Summary Download a file from Filesystem
// @Description Download any file from sandbox logs filesystem
// @Accept json
// @Produce octet-stream
// @Success 200 {object} main.StreamData
// @Router /files/download [get]
// @Param path query string true "Path"
func downloadhandler(w http.ResponseWriter, r *http.Request) {
//Get query params
params := r.URL.Query()
path := params["path"]
if len(path) == 0 {
log.Println("path not found in URL")
error := &Error{
Error: "path not found in URL"}
retObj, err := json.Marshal(error)
if err != nil {
log.Print(err)
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Write(retObj)
return
}
file, err := os.Open(path[0])
if err != nil {
log.Print(err)
}
filename := filepath.Base(path[0])
w.Header().Set("Content-Type", "application/octet-stream")
w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%q", filename))
io.Copy(w, file)
file.Close()
}
// read a file from sandbox filesystem with given offset and length godoc
// @Summary Read a file from Filesystem
// @Description Reads any file from sandbox logs filesystem and serves as a json object
// @Accept json
// @Success 200 {object} main.StreamData
// @Router /files/read [get]
// @Param path query string true "Path"
// @Param offset query int true "Offset"
// @Param length query int true "Length"
// @Param jsonp query string true "jsonp"
func readHandler(w http.ResponseWriter, r *http.Request) {
// Get query path params
params := r.URL.Query()
path := params["path"]
//check if path exists in the query params if not send error response
if len(path) == 0 {
log.Println("path not found in URL")
error := &Error{
Error: "path not found in URL"}
retObj, err := json.Marshal(error)
if err != nil {
log.Print(err)
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Write(retObj)
return
}
var err error
//check if offset exists in the query params if not send error response
if len(params["offset"]) == 0 {
error := &Error{
Error: "offset not found in URL"}
retObj, err := json.Marshal(error)
if err != nil {
log.Print(err)
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Write(retObj)
return
}
offset, err := strconv.ParseInt(params["offset"][0], 10, 64)
if err != nil {
log.Print(err)
}
//check if length exists in the query params if not send error response
if len(params["length"]) == 0 {
error := &Error{
Error: "length not found in URL"}
retObj, err := json.Marshal(error)
if err != nil {
log.Print(err)
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Write(retObj)
return
}
length, err := strconv.ParseInt(params["length"][0], 10, 64)
if err != nil {
log.Print(err)
}
size := getSize(path[0])
// if offset is invalid set it to size of the file
if offset == -1 {
offset = size
}
//set length if it is invalid
if length == -1 {
length = size - offset
}
// Cap the read length at 16 pages.
length = int64(math.Min(float64(length), float64(C.sysconf(C._SC_PAGE_SIZE)*16)))
// return empty data when offset is greater than size of the file
if offset >= size {
staremData := &StreamData{
Data: "",
Offset: size}
respObj, err := json.Marshal(staremData)
if err != nil {
fmt.Fprintf(w, "json encode error")
return
}
callbackName := r.URL.Query().Get("jsonp")
if callbackName == "" {
fmt.Fprintf(w, "Please give callback name in query string")
return
}
w.Header().Set("Content-Type", "application/javascript")
w.Header().Set("Access-Control-Allow-Origin", "*")
fmt.Fprintf(w, "%s(%s);", callbackName, respObj)
return
}
file, err := os.Open(path[0])
if err != nil {
log.Print(err)
}
defer file.Close()
s := io.NewSectionReader(file, 0, size)
buf2 := make([]byte, length)
_, err = s.ReadAt(buf2, offset)
if err != nil {
log.Print(err)
}
staremData := &StreamData{
Data: string(buf2),
Offset: offset}
respObj, err := json.Marshal(staremData)
if err != nil {
fmt.Fprintf(w, "json encode error")
return
}
callbackName := r.URL.Query().Get("jsonp")
if callbackName == "" {
fmt.Fprintf(w, "Please give callback name in query string")
return
}
w.Header().Set("Content-Type", "application/javascript")
w.Header().Set("Access-Control-Allow-Origin", "*")
fmt.Fprintf(w, "%s(%s);", callbackName, respObj)
}
// browse sandbox filesystem godoc
// @Summary Browse Filesystem
// @Description serves sandbox logs filesystem as a json object
// @Accept json
// @Produce json
// @Success 200 {object} main.Result
// @Router /files/browse [get]
// @Param path query string true "Path"
func browseHandler(w http.ResponseWriter, r *http.Request) {
//Get query Params
params := r.URL.Query()
path := params["path"]
//check if path exists in the query params if not send error response
if len(path) == 0 {
log.Println("path not found in URL")
error := &Error{
Error: "path not found in URL"}
retObj, err := json.Marshal(error)
if err != nil {
log.Print(err)
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Write(retObj)
return
}
// walk through the directory structure and build fileInformation struct and append to result array
result := []FileInformation{}
//test := strings.Split(path[0], "/")[len(strings.Split(path[0], "/"))-1]
//fmt.Print(test, " ")
//fmt.Print(test, " ")
err := filepath.WalkDir(path[0],
func(filePath string, dirEntry os.DirEntry, err error) error {
if len(strings.Split(filePath, "/")) < len(strings.Split(path[0], "/"))+2 {
if err != nil {
return err
}
fileInfo, err := dirEntry.Info()
fileStat, err := os.Stat(filePath)
if err != nil {
return err
}
// retrieve file ownership information and number of hardlinks to the file
var nlink, uid, gid uint64
if sys := fileStat.Sys(); sys != nil {
if stat, ok := sys.(*syscall.Stat_t); ok {
nlink = uint64(stat.Nlink)
uid = uint64(stat.Uid)
gid = uint64(stat.Gid)
}
}
usr, err := user.LookupId(strconv.FormatUint(uid, 10))
group, err := user.LookupGroupId(strconv.FormatUint(gid, 10))
if err != nil {
return err
}
jsonData := FileInformation{
Mode: fileInfo.Mode().String(),
Nlink: string(strconv.FormatUint(nlink, 10)),
UID: usr.Username,
GID: group.Name,
Size: strconv.Itoa(int(fileInfo.Size())),
Mtime: fileInfo.ModTime().Unix(),
Path: filePath,
}
if err == nil {
result = append(result, jsonData)
}
}
return nil
})
if err != nil {
log.Println(err)
}
resultdata := Result{result}
c, err := json.Marshal(resultdata)
if err == nil {
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Write(c)
}
}
//Get the size of a file
func getSize(p string) int64 {
if stat, err := os.Stat(p); err == nil {
return stat.Size()
}
return 0
}
// @title k8s Sandbox Go Restful API with Swagger
// @version 1.0
// @description Rest API doc for sandbox API's
// @contact.name Revanth Chandra
// @host localhost:8080
// @BasePath /
func main() {
http.HandleFunc("/files/read", readHandler)
http.HandleFunc("/files/browse", browseHandler)
http.HandleFunc("/files/download", downloadhandler)
http.HandleFunc("/swagger/", httpSwagger.WrapHandler)
http.ListenAndServe(":5051", nil)
}

127
stream/main_test.go Normal file
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package main
import (
"net/http"
"net/http/httptest"
"testing"
)
func TestBrowseHandler(t *testing.T) {
req, err := http.NewRequest("GET", "/files/browse", nil)
if err != nil {
t.Fatal(err)
}
q := req.URL.Query()
q.Add("path", ".")
req.URL.RawQuery = q.Encode()
rr := httptest.NewRecorder()
handler := http.HandlerFunc(browseHandler)
handler.ServeHTTP(rr, req)
if status := rr.Code; status != http.StatusOK {
t.Errorf("handler returned wrong status code: got %v want %v",
status, http.StatusOK)
}
}
func TestReadHandlerWIthVakidOffset(t *testing.T) {
req, err := http.NewRequest("GET", "/files/read", nil)
if err != nil {
t.Fatal(err)
}
q := req.URL.Query()
q.Add("path", "/Users/revchandra/Desktop/go/dce.err")
q.Add("offset", "0")
q.Add("length", "1000")
q.Add("jsonp", "jQuery17107124409226948478_1614562818140&_=1614562818159")
req.URL.RawQuery = q.Encode()
rr := httptest.NewRecorder()
handler := http.HandlerFunc(readHandler)
handler.ServeHTTP(rr, req)
if status := rr.Code; status != http.StatusOK {
t.Errorf("handler returned wrong status code: got %v want %v",
status, http.StatusOK)
}
}
func TestReadHandlerWithOffsetOverflow(t *testing.T) {
req, err := http.NewRequest("GET", "/files/read", nil)
if err != nil {
t.Fatal(err)
}
q := req.URL.Query()
q.Add("path", ".")
q.Add("offset", "4174")
q.Add("length", "1000")
q.Add("jsonp", "jQuery17107124409226948478_1614562818140&_=1614562818159")
req.URL.RawQuery = q.Encode()
rr := httptest.NewRecorder()
handler := http.HandlerFunc(readHandler)
handler.ServeHTTP(rr, req)
if status := rr.Code; status != http.StatusOK {
t.Errorf("handler returned wrong status code: got %v want %v",
status, http.StatusOK)
}
}
func TestReadHandlerWithInvalidOffset(t *testing.T) {
req, err := http.NewRequest("GET", "/files/read", nil)
if err != nil {
t.Fatal(err)
}
q := req.URL.Query()
q.Add("path", ".")
q.Add("offset", "-1")
q.Add("length", "-1")
q.Add("jsonp", "jQuery17107124409226948478_1614562818140&_=1614562818159")
req.URL.RawQuery = q.Encode()
rr := httptest.NewRecorder()
handler := http.HandlerFunc(readHandler)
handler.ServeHTTP(rr, req)
if status := rr.Code; status != http.StatusOK {
t.Errorf("handler returned wrong status code: got %v want %v",
status, http.StatusOK)
}
}
func TestDownloadHandler(t *testing.T) {
req, err := http.NewRequest("GET", "/files/download", nil)
if err != nil {
t.Fatal(err)
}
q := req.URL.Query()
q.Add("path", ".")
req.URL.RawQuery = q.Encode()
rr := httptest.NewRecorder()
handler := http.HandlerFunc(downloadhandler)
handler.ServeHTTP(rr, req)
if status := rr.Code; status != http.StatusOK {
t.Errorf("handler returned wrong status code: got %v want %v",
status, http.StatusOK)
}
}
func TestDownloadHandlerWithInvalidPath(t *testing.T) {
req, err := http.NewRequest("GET", "/files/download", nil)
if err != nil {
t.Fatal(err)
}
q := req.URL.Query()
q.Add("path", ".")
req.URL.RawQuery = q.Encode()
rr := httptest.NewRecorder()
handler := http.HandlerFunc(downloadhandler)
handler.ServeHTTP(rr, req)
if status := rr.Code; status != http.StatusOK {
t.Errorf("handler returned wrong status code: got %v want %v",
status, http.StatusOK)
}
}