virtbuf/configfile/main.go

package main

import "log"
import "bytes"
import "os"
import "bufio"
import "io/ioutil"

import "google.golang.org/protobuf/proto"
import pb "go.wit.com/lib/protobuf/virtbuf"

//
// saves entries in a config file
//

func main() {
	TestWriteDroplet()

	in, err := ioutil.ReadFile("/tmp/testing4.protobuf")
	if err != nil {
		log.Fatalln("Error reading file:", err)
	}

	var aCluster  pb.Cluster
	if err := proto.Unmarshal(in, &aCluster); err != nil {
		log.Fatalln("Failed to parse droplet:", err)
	}

	log.Println(aCluster)
	for i, d := range aCluster.Droplets {
		log.Println("\tdrop =", i, d)
	}
}

func marshalWriteToFile(myWriter *bufio.Writer, c *pb.Cluster) {
	buf, err := proto.Marshal(c)
	if err != nil {
		log.Fatal("marshaling error: ", err)
	}
	tmp, err := myWriter.Write(buf)
	myWriter.Flush()
	log.Println("bufio.Write() tmp, err = ", tmp, err)

	buf, err = proto.Marshal(c)
	tmp2, err := myWriter.Write(buf)
	myWriter.Flush()
	log.Println("bufio.Write() tmp2, err = ", tmp2, err)
}

func TestWriteDroplet() {
	buf := new(bytes.Buffer)

	c := pb.CreateSampleCluster(3)

	got := buf.String()
	log.Println(got)

	newfile, _ := os.Create("/tmp/testing4.protobuf")
	myWriter := bufio.NewWriter(newfile)
	marshalWriteToFile(myWriter, c)

	marshalUnmarshal()
}

func marshalUnmarshal() {
	test := pb.CreateSampleCluster(7)
	data, err := proto.Marshal(test)
	if err != nil {
		log.Fatal("marshaling error: ", err)
	}

	newTest := &pb.Cluster{}
	err = proto.Unmarshal(data, newTest)
	if err != nil {
		log.Fatal("unmarshaling error: ", err)
	} else {
		log.Println("proto.Marshal() and proto.Unmarshal() worked")
	}
}