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misc.go
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misc.go
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// Copyright (c) 2014 The VolantMQ 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 routines
import (
"encoding/binary"
"errors"
"io"
"net"
"github.com/VolantMQ/vlapi/mqttp"
)
var (
// ErrInvalidConnectionType connection object is invalid
ErrInvalidConnectionType = errors.New("connection object is invalid")
)
// WriteMessage write message into connection
func WriteMessage(conn io.Closer, msg mqttp.IFace) error {
size, err := msg.Size()
if err != nil {
return err
}
buf := make([]byte, size)
if _, err = msg.Encode(buf); err != nil {
return err
}
return WriteMessageBuffer(conn, buf)
}
// GetMessageBuffer read message from connection
func GetMessageBuffer(c io.Closer) ([]byte, error) {
if c == nil {
return nil, ErrInvalidConnectionType
}
conn, ok := c.(net.Conn)
if !ok {
return nil, ErrInvalidConnectionType
}
var buf []byte
// tmp buffer to read a single byte
var b = make([]byte, 1)
// total bytes read
var l int
// 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, errors.New("connect/getMessage: 4th byte of remaining length has continuation bit set")
}
n, err := conn.Read(b[0:])
if err != nil {
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
}
// WriteMessageBuffer write buffered message into connection
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
}