Example for channels, inspired by vansimke's YouTube tutorial

chan_example.go

// https://play.golang.org/p/Y8eaSkYNgG

package main

import (
	"fmt"
)

const (
	logDebug = "DEBUG"
	logInfo  = "INFO"
	logError = "ERROR"
)

type logEntry struct {
	LogLevel string
	Text     string
}

func main() {
	logCh := make(chan logEntry)
	doneCh := make(chan struct{})
	go logger(logCh, doneCh)
	defer func() {
		doneCh <- struct{}{}
		close(logCh)
		close(doneCh)
	}()

	logCh <- logEntry{LogLevel: logInfo, Text: "Application starting up."}
	logCh <- logEntry{LogLevel: logInfo, Text: "Application shutting down."}
}

func logger(ch <-chan logEntry, doneCh <-chan struct{}) {
	for {
		select {
		case entry := <- ch:
			fmt.Printf("[%v] %v\n", entry.LogLevel, entry.Text)
		case <-doneCh:
			break
		}

	}
}