Adding ability to use a config file in order to reduce command length.

CHANGELOG

@@ -3,4 +3,6 @@
 * Backup and snapshot commands have now been moved to under the force subcommand as these are expensive operations
 and the subcommand should reflect that.
 * Cobra library upgrade.
-* Added version command.
+* Added version command.
+* Added ability to use  config config file. By default this file will be located in /etc/aurora/australis.yml
+* Changed insecureSkipVerify to skipCertVerification.

cmd/root.go

@@ -1,37 +1,44 @@
 package cmd
 
 import (
-	"fmt"
+    "fmt"
-	"os"
+    "github.com/spf13/viper"
-	"time"
+    "os"
+    "strings"
+    "time"
 
-	"github.com/paypal/gorealis"
+    "github.com/paypal/gorealis"
-	"github.com/spf13/cobra"
+    "github.com/spf13/cobra"
 )
 
 var username, password, zkAddr, schedAddr string
 var env, role, name = new(string), new(string), new(string)
 var client realis.Realis
 var monitor *realis.Monitor
-var insecureSkipVerify bool
+var skipCertVerification bool
 var caCertsPath string
 var clientKey, clientCert string
+var configFile string
 
 const australisVer = "v0.0.5"
 
 var monitorInterval, monitorTimeout int
 
 func init() {
+
+
 	rootCmd.SetVersionTemplate(`{{printf "%s\n" .Version}}`)
 
-	rootCmd.PersistentFlags().StringVarP(&zkAddr, "zookeeper", "z", "", "Zookeeper node(s) where Aurora stores information.")
+	rootCmd.PersistentFlags().StringVarP(&zkAddr, "zookeeper", "z", "", "Zookeeper node(s) where Aurora stores information. (comma separated list)")
 	rootCmd.PersistentFlags().StringVarP(&username, "username", "u", "", "Username to use for API authentication")
 	rootCmd.PersistentFlags().StringVarP(&password, "password", "p", "", "Password to use for API authentication")
 	rootCmd.PersistentFlags().StringVarP(&schedAddr, "scheduler_addr", "s", "", "Aurora Scheduler's address.")
 	rootCmd.PersistentFlags().StringVarP(&clientKey, "clientKey", "k", "", "Client key to use to connect to Aurora.")
 	rootCmd.PersistentFlags().StringVarP(&clientCert, "clientCert", "c", "", "Client certificate to use to connect to Aurora.")
-	rootCmd.PersistentFlags().StringVarP(&caCertsPath, "caCertsPath", "a", "", "CA certificates path to use.")
+	rootCmd.PersistentFlags().StringVarP(&caCertsPath, "caCertsPath", "a", "", "Path where CA certificates can be found.")
-	rootCmd.PersistentFlags().BoolVarP(&insecureSkipVerify, "insecureSkipVerify", "i", false, "Skip verification.")
+	rootCmd.PersistentFlags().BoolVarP(&skipCertVerification, "skipCertVerification", "i", false, "Skip CA certificate hostname verification.")
+	rootCmd.PersistentFlags().StringVar(&configFile, "config",  "/etc/aurora/australis.yml", "Config file to use.")
+
 }
 
 var rootCmd = &cobra.Command{
@@ -51,8 +58,42 @@ func Execute() {
 }
 
 func connect(cmd *cobra.Command, args []string) {
+    var err error
 
-	var err error
+    zkAddrSlice := strings.Split(zkAddr, ",")
+
+    viper.SetConfigFile(configFile)
+    err = viper.ReadInConfig()
+    if err == nil {
+        // Best effort load configuration. Will only set config values when flags have not set them already.
+        if viper.IsSet("zk") && len(zkAddrSlice) == 1 && zkAddrSlice[0] == "" {
+            zkAddrSlice = viper.GetStringSlice("zk")
+        }
+
+        if viper.IsSet("username") && username == "" {
+            username = viper.GetString("username")
+        }
+
+        if viper.IsSet("password") && password == "" {
+            password = viper.GetString("password")
+        }
+
+        if viper.IsSet("clientKey") && clientKey == "" {
+            clientKey = viper.GetString("clientKey")
+        }
+
+        if viper.IsSet("clientCert") && clientCert == "" {
+            clientCert = viper.GetString("clientCert")
+        }
+
+        if viper.IsSet("caCertsPath") && caCertsPath == "" {
+            caCertsPath = viper.GetString("caCertsPath")
+        }
+
+        if viper.IsSet("skipCertVerification") && !skipCertVerification {
+            skipCertVerification = viper.GetBool("skipCertVerification")
+        }
+    }
 
 	realisOptions := []realis.ClientOption{realis.BasicAuth(username, password),
 		realis.ThriftJSON(),
@@ -65,9 +106,9 @@ func connect(cmd *cobra.Command, args []string) {
 		})}
 
 	// Prefer zookeeper if both ways of connecting are provided
-	if zkAddr != "" {
+	if len(zkAddrSlice) > 0 && zkAddrSlice[0] != "" {
 		// Configure Zookeeper to connect
-		zkOptions := []realis.ZKOpt{ realis.ZKEndpoints(zkAddr), realis.ZKPath("/aurora/scheduler")}
+		zkOptions := []realis.ZKOpt{ realis.ZKEndpoints(zkAddrSlice...), realis.ZKPath("/aurora/scheduler")}
 		realisOptions = append(realisOptions, realis.ZookeeperOptions(zkOptions...))
 	} else if schedAddr != "" {
 		realisOptions = append(realisOptions, realis.SchedulerUrl(schedAddr))
@@ -81,7 +122,7 @@ func connect(cmd *cobra.Command, args []string) {
 		realisOptions = append(realisOptions,
 			realis.Certspath(caCertsPath),
 			realis.ClientCerts(clientKey, clientCert),
-			realis.InsecureSkipVerify(insecureSkipVerify))
+			realis.InsecureSkipVerify(skipCertVerification))
 	}
 
 	// Connect to Aurora Scheduler and create a client object