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supervisor-event-handler

This small library abstracts away supervisor's event handling protocol and provides an easy way to process events. For more detailed information about events, please check here.

features

  • support generic events, like PROCESS_STATE to handle PROCESS_STATE* events
  • run processors via goroutines to avoid buffer overflow as much as possible

installation

go get -u github.com/mtyurt/supervisor-event-handler

usage

The example/ directory contains a fully working application with Docker.

package main

import (
	"fmt"
	"os"

	eventhandler "github.com/mtyurt/supervisor-event-handler"
)

func main() {
	handler := eventhandler.New()

	handler.HandleEvent("PROCESS_STATE", func(header eventhandler.HeaderTokens, payload map[string]string) {
		fmt.Fprintf(os.Stderr, "event: %s, payload: %v\n", header.EventName, payload)
	})
	handler.Start()
}
  • handler.Start() is a blocking process, it will run until the process is killed.
  • Event handlers are run via goroutines to not overflow the supervisor event buffer. If the process cannot keep up with incoming events, the oldest event will be discarded by supervisor.
  • Supervisor's event handler mechanism requires the process to print to stdout, so do not print to stdout.

licence

The BSD 3-Clause License - see LICENSE for more details.