44 lines
954 B
Go
44 lines
954 B
Go
package main
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import (
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"encoding/json"
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"fmt"
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"html"
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"log"
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"net/http"
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)
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const powercapDir = "/sys/class/powercap/"
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// Cap is a payload that is expected from Elektron to cap a node.
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type Cap struct {
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Percentage int
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}
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func main() {
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, "Unsupported endpoint %s", html.EscapeString(r.URL.Path))
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})
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http.HandleFunc("/powercap", powercapEndpoint)
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log.Fatal(http.ListenAndServe(":9090", nil))
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}
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// Handler for the powercapping HTTP API endpoint.
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func powercapEndpoint(w http.ResponseWriter, r *http.Request) {
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var payload Cap
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decoder := json.NewDecoder(r.Body)
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err := decoder.Decode(&payload)
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if err != nil {
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http.Error(w, "error parsing payload: "+err.Error(), 400)
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return
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}
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err = capNode(powercapDir, payload.Percentage)
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if err != nil {
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http.Error(w, err.Error(), 400)
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return
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}
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fmt.Fprintf(w, "capped node at %d percent", payload.Percentage)
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}
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