virtbuf/configfile/main.go

package main

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

	"google.golang.org/protobuf/proto"

	pb "go.wit.com/lib/protobuf/virtbuf"
)

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

func main() {
	TestWriteCluster()

	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.String())
	// show the droplets to STDOUT
	for _, d := range aCluster.Droplets {
		fmt.Println("\tdroplet =", d.Hostname, "preffered host:", d.PreferredHypervisor)
	}

	// show the hypervisors to STDOUT
	for _, h := range aCluster.Hypervisors {
		fmt.Println("\thypervisor =", h.Hostname, h.GetMemoryPrintable())
	}

	json := aCluster.FormatJSON()
	fmt.Println(json)

	data, _ := aCluster.MarshalJSON()
	fmt.Println(string(data))

	text := aCluster.FormatTEXT()
	fmt.Println(text)
}

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 TestWriteCluster() {
	buf := new(bytes.Buffer)

	c := pb.CreateSampleCluster(7)

	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")
	}
}