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misc.go
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/
misc.go
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// Copyright (c) 2014 The SurgeMQ Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package service
import (
"encoding/binary"
"fmt"
"io"
"net"
"github.com/frickelblog/message"
)
func getConnectMessage(conn io.Closer) (*message.ConnectMessage, error) {
buf, err := getMessageBuffer(conn)
if err != nil {
//glog.Debugf("Receive error: %v", err)
return nil, err
}
msg := message.NewConnectMessage()
_, err = msg.Decode(buf)
//glog.Debugf("Received: %s", msg)
return msg, err
}
func getConnackMessage(conn io.Closer) (*message.ConnackMessage, error) {
buf, err := getMessageBuffer(conn)
if err != nil {
//glog.Debugf("Receive error: %v", err)
return nil, err
}
msg := message.NewConnackMessage()
_, err = msg.Decode(buf)
//glog.Debugf("Received: %s", msg)
return msg, err
}
func writeMessage(conn io.Closer, msg message.Message) error {
buf := make([]byte, msg.Len())
_, err := msg.Encode(buf)
if err != nil {
//glog.Debugf("Write error: %v", err)
return err
}
//glog.Debugf("Writing: %s", msg)
return writeMessageBuffer(conn, buf)
}
func getMessageBuffer(c io.Closer) ([]byte, error) {
if c == nil {
return nil, ErrInvalidConnectionType
}
conn, ok := c.(net.Conn)
if !ok {
return nil, ErrInvalidConnectionType
}
var (
// the message buffer
buf []byte
// tmp buffer to read a single byte
b []byte = make([]byte, 1)
// total bytes read
l int = 0
)
// Let's read enough bytes to get the message header (msg type, remaining length)
for {
// If we have read 5 bytes and still not done, then there's a problem.
if l > 5 {
return nil, fmt.Errorf("connect/getMessage: 4th byte of remaining length has continuation bit set")
}
n, err := conn.Read(b[0:])
if err != nil {
//glog.Debugf("Read error: %v", err)
return nil, err
}
// Technically i don't think we will ever get here
if n == 0 {
continue
}
buf = append(buf, b...)
l += n
// Check the remlen byte (1+) to see if the continuation bit is set. If so,
// increment cnt and continue reading. Otherwise break.
if l > 1 && b[0] < 0x80 {
break
}
}
// Get the remaining length of the message
remlen, _ := binary.Uvarint(buf[1:])
buf = append(buf, make([]byte, remlen)...)
for l < len(buf) {
n, err := conn.Read(buf[l:])
if err != nil {
return nil, err
}
l += n
}
return buf, nil
}
func writeMessageBuffer(c io.Closer, b []byte) error {
if c == nil {
return ErrInvalidConnectionType
}
conn, ok := c.(net.Conn)
if !ok {
return ErrInvalidConnectionType
}
_, err := conn.Write(b)
return err
}
// Copied from http://golang.org/src/pkg/net/timeout_test.go
func isTimeout(err error) bool {
e, ok := err.(net.Error)
return ok && e.Timeout()
}