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connect.go
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connect.go
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// Copyright 2014, Shuhei Tanuma. All rights reserved.
// Use of this source code is governed by a MIT license
// that can be found in the LICENSE file.
package mqtt
import (
"bytes"
"encoding/binary"
"encoding/json"
"fmt"
"io"
)
type ConnectMessage struct {
FixedHeader
Magic []byte `json:"magic"`
Version uint8 `json:"version"`
Flag uint8 `json:"flag"`
KeepAlive uint16 `json:"keep_alive"`
Identifier string `json:"identifier"`
Will *WillMessage `json:"will"`
CleanSession bool `json:clean_session`
UserName []byte `json:"user_name"`
Password []byte `json:"password"`
}
func (self *ConnectMessage) WriteTo(w io.Writer) (int64, error) {
var headerLength uint16 = uint16(len(self.Magic))
var size int = 0
if self.CleanSession {
self.Flag |= 0x02
}
if self.Will != nil {
self.Flag |= 0x04
switch self.Will.Qos {
case 1:
self.Flag |= 0x08
case 2:
self.Flag |= 0x18
}
}
if len(self.UserName) > 0 {
self.Flag |= 0x80
}
if len(self.Password) > 0 {
self.Flag |= 0x40
}
size += 2 + len(self.Magic)
size += 1 + 1 + 2
if self.Identifier != "" {
size += 2 + len(self.Identifier)
}
if (int(self.Flag)&0x04 > 0) && self.Will != nil {
size += self.Will.Size()
}
if int(self.Flag)&0x80 > 0 {
size += 2 + len(self.UserName)
}
if int(self.Flag)&0x40 > 0 {
size += 2 + len(self.Password)
}
self.FixedHeader.writeTo(size, w)
err := binary.Write(w, binary.BigEndian, headerLength)
if err != nil {
return 0, err
}
w.Write(self.Magic)
binary.Write(w, binary.BigEndian, self.Version)
binary.Write(w, binary.BigEndian, self.Flag)
binary.Write(w, binary.BigEndian, self.KeepAlive)
var Length uint16 = 0
if self.Identifier != "" {
Length = uint16(len(self.Identifier))
}
binary.Write(w, binary.BigEndian, Length)
if Length > 0 {
w.Write([]byte(self.Identifier))
}
if (int(self.Flag)&0x04 > 0) && self.Will != nil {
self.Will.WriteTo(w)
}
if int(self.Flag)&0x80 > 0 {
Length = uint16(len(self.UserName))
err = binary.Write(w, binary.BigEndian, Length)
w.Write(self.UserName)
}
if int(self.Flag)&0x40 > 0 {
Length = uint16(len(self.Password))
err = binary.Write(w, binary.BigEndian, Length)
w.Write(self.Password)
}
return int64(size), nil
}
func (self *ConnectMessage) decode(reader io.Reader) error {
var Length uint16
offset := 0
buffer := make([]byte, self.FixedHeader.RemainingLength)
w := bytes.NewBuffer(buffer)
w.Reset()
//TODO: should check error
io.CopyN(w, reader, int64(self.FixedHeader.RemainingLength))
buffer = w.Bytes()
reader = bytes.NewReader(buffer)
binary.Read(reader, binary.BigEndian, &Length)
offset += 2
if self.FixedHeader.RemainingLength < offset+int(Length) {
return fmt.Errorf("Length overs buffer size. %d, %d", self.FixedHeader.RemainingLength, offset+int(Length))
}
self.Magic = buffer[offset : offset+int(Length)]
offset += int(Length)
if offset > len(buffer) {
return fmt.Errorf("offset: %d, buffer: %d", offset, len(buffer))
}
nr := bytes.NewReader(buffer[offset:])
binary.Read(nr, binary.BigEndian, &self.Version)
binary.Read(nr, binary.BigEndian, &self.Flag)
binary.Read(nr, binary.BigEndian, &self.KeepAlive)
offset += 1 + 1 + 2
// order Client ClientIdentifier, Will Topic, Will Message, User Name, Password
var ClientIdentifierLength uint16
binary.Read(nr, binary.BigEndian, &ClientIdentifierLength)
offset += 2
if ClientIdentifierLength > 0 {
self.Identifier = string(buffer[offset : offset+int(ClientIdentifierLength)])
offset += int(ClientIdentifierLength)
}
if int(self.Flag)&0x04 > 0 {
will := &WillMessage{}
nr := bytes.NewReader(buffer[offset:])
binary.Read(nr, binary.BigEndian, &ClientIdentifierLength)
offset += 2
will.Topic = string(buffer[offset : offset+int(ClientIdentifierLength)])
offset += int(ClientIdentifierLength)
nr = bytes.NewReader(buffer[offset:])
binary.Read(nr, binary.BigEndian, &ClientIdentifierLength)
offset += 2
will.Message = string(buffer[offset : offset+int(ClientIdentifierLength)])
offset += int(ClientIdentifierLength)
if int(self.Flag)&0x32 > 0 {
will.Retain = true
}
q := (int(self.Flag) >> 3)
if q&0x02 > 0 {
will.Qos = 2
} else if q&0x01 > 0 {
will.Qos = 1
}
self.Will = will
}
if int(self.Flag)&0x80 > 0 {
nr := bytes.NewReader(buffer[offset:])
binary.Read(nr, binary.BigEndian, &Length)
offset += 2
self.UserName = buffer[offset : offset+int(Length)]
offset += int(Length)
}
if int(self.Flag)&0x40 > 0 {
nr := bytes.NewReader(buffer[offset:])
offset += 2
binary.Read(nr, binary.BigEndian, &Length)
self.Password = buffer[offset : offset+int(Length)]
offset += int(Length)
}
if int(self.Flag)&0x02 > 0 {
self.CleanSession = true
}
return nil
}
func (self *ConnectMessage) String() string {
b, _ := json.Marshal(self)
return string(b)
}