Micro go-config issue example

example.go

package main

import (
	"io/ioutil"
	"log"
	"time"

	config "github.com/micro/go-config"
)

func overwriteConfig(flip bool) {
	json := `{"hosts":{"database":{"address":"10.0.0.1","port": 3306}}}`
	if flip {
		json = `{"hosts":{"database":{"address":"example.com","port": 3306}}}`
	}
	log.Printf("Overwriting configuration: %s\n", json)
	ioutil.WriteFile("config.json", []byte(json), 0644)
}

func main() {
	// Establish initial state.
	overwriteConfig(false)

	// Load configuration.
	config.LoadFile("config.json")

	// Load initial value.
	var val interface{}
	config.Get("hosts", "database", "address").Scan(&val)
	log.Printf("Initial value: %+v\n", val)

	// Set up watch
	w, err := config.Watch("hosts", "database", "address")
	if err != nil {
		log.Fatalf("Problem configuring watch: %s", err)
	}

	// Queue up a change.
	go func() {
		time.Sleep(5 * time.Second)
		overwriteConfig(true)
	}()

	// Wait for changes.
	for {
		newVal, err := w.Next()
		if err != nil {
			log.Fatalf("Problem getting next watch: %s", err)
		}
		log.Printf("Got a change!\n")

		err = newVal.Scan(&val)
		if err != nil {
			log.Fatalf("Problem getting new value: %s", err)
		}

		log.Printf("New value: %+v\n", val)
	}
}

output.txt

$ go run main.go
2019/01/02 14:48:10 Overwriting configuration: {"hosts":{"database":{"address":"10.0.0.1","port": 3306}}}
2019/01/02 14:48:10 Initial value: 10.0.0.1
2019/01/02 14:48:15 Overwriting configuration: {"hosts":{"database":{"address":"example.com","port": 3306}}}
2019/01/02 14:48:15 Problem getting next watch: invalid character 'e' looking for beginning of value