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messaging.go
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/
messaging.go
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package protobufmessaging
import (
"bufio"
"encoding/binary"
"fmt"
"io"
"log"
"net"
"time"
"github.com/mkyas/miniraft"
"google.golang.org/protobuf/proto"
)
const (
MessageLengthSize = 8
MaxMessageSize = 1024 * 1024 // 1MB should be plenty
ReadTimeout = 10 * time.Second
WriteTimeout = 10 * time.Second
)
func logf(format string, v ...interface{}) {
log.Printf(format, v...)
}
func handleError(err error) error {
if err != nil && err != io.EOF {
logf("Error: %s\n", err)
}
return err
}
func ReceiveMessage(conn net.Conn) (*miniraft.Raft, error) {
conn.SetReadDeadline(time.Now().Add(ReadTimeout))
reader := bufio.NewReader(conn)
bs := make([]byte, MessageLengthSize)
_, err := io.ReadFull(reader, bs)
if err = handleError(err); err != nil {
return nil, err
}
numBytes := int(binary.BigEndian.Uint64(bs))
if numBytes > MaxMessageSize {
return nil, fmt.Errorf("message too large: %d", numBytes)
}
data := make([]byte, numBytes)
_, err = io.ReadFull(reader, data)
if err = handleError(err); err != nil {
return nil, err
}
message := &miniraft.Raft{}
err = proto.Unmarshal(data, message)
if err = handleError(err); err != nil {
return nil, err
}
logf("Received %s from %s\n", message, conn.RemoteAddr().String())
return message, nil
}
func SendMessage(conn net.Conn, message *miniraft.Raft) error {
conn.SetWriteDeadline(time.Now().Add(WriteTimeout))
data, err := proto.Marshal(message)
if err = handleError(err); err != nil {
return err
}
logf("Sending %s to %s\n", message, conn.RemoteAddr().String())
bs := make([]byte, MessageLengthSize)
binary.BigEndian.PutUint64(bs, uint64(len(data)))
_, err = conn.Write(bs)
if err = handleError(err); err != nil {
return err
}
_, err = conn.Write(data)
return handleError(err)
}