func (p *TFramedTransport) Flush() error {
// 确保Transport是打开的
if !p.IsOpen() {
err := p.Open()
if err != nil {
return err
}
}
size := p.buf.Len()
buf := p.buffer[:4]
binary.BigEndian.PutUint32(buf, uint32(size))
_, err := p.transport.Write(buf)
if err != nil {
p.Close()
return thrift.NewTTransportExceptionFromError(err)
}
if size > 0 {
if n, err := p.buf.WriteTo(p.transport); err != nil {
print("Error while flushing write buffer of size ", size, " to transport, only wrote ", n, " bytes: ", err.Error(), "\n")
p.Close()
return thrift.NewTTransportExceptionFromError(err)
}
}
err = p.transport.Flush()
if err != nil {
p.Close()
}
return thrift.NewTTransportExceptionFromError(err)
}
func (p *TBufferedFramedTransport) Read(buf []byte) (l int, err error) {
// 1. 首先读取Frame Header
if p.FrameSize == 0 {
p.FrameSize, err = p.readFrameHeader()
if err != nil {
return
}
}
// 2. 异常处理
if p.FrameSize < len(buf) {
frameSize := p.FrameSize
tmp := make([]byte, p.FrameSize)
l, err = p.Read(tmp)
copy(buf, tmp)
if err == nil {
err = thrift.NewTTransportExceptionFromError(
fmt.Errorf("Not enough frame size %d to read %d bytes",
frameSize, len(buf)))
return
}
}
// 3. 读取剩下的数据
got, err := p.Reader.Read(buf)
p.FrameSize = p.FrameSize - got
//sanity check
if p.FrameSize < 0 {
return 0, thrift.NewTTransportException(thrift.UNKNOWN_TRANSPORT_EXCEPTION,
"Negative frame size")
}
return got, thrift.NewTTransportExceptionFromError(err)
}
// 读取Frame的完整的数据，包含
func (p *TBufferedFramedTransport) ReadFrame() (frame []byte, err error) {
if p.FrameSize != 0 {
err = thrift.NewTTransportExceptionFromError(
fmt.Errorf("Unexpected frame size: %d", p.FrameSize))
return nil, err
}
var frameSize int
// Reader来自transport, 中间被封装了多长
frameSize, err = p.readFrameHeader()
if err != nil {
err1, ok := err.(thrift.TTransportException)
if ok {
err = thrift.NewTTransportException(err1.TypeId(),
fmt.Sprintf("Frame Header Read Error: %s", err1.Error()))
} else {
err = thrift.NewTTransportExceptionFromError(
fmt.Errorf("Frame Header Read Error: %s", err.Error()))
}
return
}
bytes := getSlice(frameSize, frameSize)
// 什么时候会出现?
// 1. 如果tcp package比较大，则容易出现package的一部分先到，另一部分随后再到
// 2. 在同一个机器上的两个进程之间出现的概率低(Time Delay小); 跨机器访问，出现概率高
var l int
l, err = io.ReadFull(p.Reader, bytes)
// l, err = p.Reader.Read(bytes)
if l != frameSize {
log.Warnf(Red("<==== ReadFrame frame size: %d, Got: %d"), frameSize, l)
}
if err != nil {
err1, ok := err.(thrift.TTransportException)
if ok {
err = thrift.NewTTransportException(err1.TypeId(),
fmt.Sprintf("Frame Data Read Error: %s", err1.Error()))
} else {
err = thrift.NewTTransportExceptionFromError(
fmt.Errorf("Frame Data Read Error: %s", err.Error()))
}
return nil, err
}
return bytes, nil
}
func (p *TFramedTransport) ReadByte() (c byte, err error) {
// 确保Transport是打开的
if !p.IsOpen() {
err = p.Open()
if err != nil {
return 0, err
}
}
if p.frameSize == 0 {
p.frameSize, err = p.readFrameHeader()
if err != nil {
p.Close()
return
}
}
if p.frameSize < 1 {
p.Close()
return 0, thrift.NewTTransportExceptionFromError(fmt.Errorf("Not enough frame size %d to read %d bytes", p.frameSize, 1))
}
c, err = p.reader.ReadByte()
if err == nil {
p.frameSize--
} else {
p.Close()
}
return
}
//
// 先写入数据，然后再Flush Transport
//
func (p *TBufferedFramedTransport) FlushBuffer(force bool) error {
size := p.Buffer.Len()
// 没有有效的数据，直接返回
if size == 0 {
return nil
}
// TODO: 待优化
force = true
// 1. 将p.buf的大小以BigEndian模式写入: buf中
buf := p.LenghW[:4]
binary.BigEndian.PutUint32(buf, uint32(size))
// log.Printf("----> Frame Size: %d, %v\n", size, buf)
// 然后transport中先写入: 长度信息
_, err := p.Writer.Write(buf)
if err != nil {
return thrift.NewTTransportExceptionFromError(err)
}
// 2. 然后继续写入p.buf中的数据
if size > 0 {
var (
n int64
err error
)
// 如果 err == io.ErrShortWrite， p.Writer中也有buffer, 因此可以不用考虑异常
if n, err = p.Buffer.WriteTo(p.Writer); err != nil {
log.ErrorErrorf(err, "Error Flushing Expect Write: %d, but %d\n",
size, n)
return thrift.NewTTransportExceptionFromError(err)
}
if n < int64(size) {
log.Printf(Red("Buffer Write Not Finished"))
}
}
p.nbuffered++
// Buffer重新开始处理数据
p.Buffer.Reset()
// Flush Buffer
return p.flushTransport(force)
}
func (p *TBufferedFramedTransport) Write(buf []byte) (int, error) {
// 直接写入Buffer
n, err := p.Buffer.Write(buf)
if n != len(buf) {
log.Errorf("TBufferedFramedTransport#Write Error")
}
return n, thrift.NewTTransportExceptionFromError(err)
}
func (p *TUnixDomain) Read(buf []byte) (int, error) {
if !p.IsOpen() {
return 0, thrift.NewTTransportException(thrift.NOT_OPEN, "Connection not open")
}
p.pushDeadline(true, false)
n, err := p.conn.Read(buf)
return n, thrift.NewTTransportExceptionFromError(err)
}
func (p *TFramedTransport) Read(buf []byte) (l int, err error) {
// 确保Transport是打开的
if !p.IsOpen() {
err = p.Open()
if err != nil {
return 0, err
}
}
if p.frameSize == 0 {
p.frameSize, err = p.readFrameHeader()
if err != nil {
p.Close()
return
}
}
if p.frameSize < len(buf) {
frameSize := p.frameSize
tmp := make([]byte, p.frameSize)
l, err = p.Read(tmp)
copy(buf, tmp)
if err == nil {
p.Close()
err = thrift.NewTTransportExceptionFromError(fmt.Errorf("Not enough frame size %d to read %d bytes", frameSize, len(buf)))
return
}
}
got, err := p.reader.Read(buf)
p.frameSize = p.frameSize - got
//sanity check
if p.frameSize < 0 {
p.Close()
return 0, thrift.NewTTransportException(thrift.UNKNOWN_TRANSPORT_EXCEPTION, "Negative frame size")
}
if err != nil {
p.Close()
}
return got, thrift.NewTTransportExceptionFromError(err)
}
func (p *TFramedTransport) Write(buf []byte) (int, error) {
// 确保Transport是打开的
if !p.IsOpen() {
err := p.Open()
if err != nil {
return 0, err
}
}
n, err := p.buf.Write(buf)
if err != nil {
p.Close()
}
return n, thrift.NewTTransportExceptionFromError(err)
}
func (p *TBufferedFramedTransport) ReadByte() (c byte, err error) {
if p.FrameSize == 0 {
p.FrameSize, err = p.readFrameHeader()
if err != nil {
return
}
}
if p.FrameSize < 1 {
return 0, thrift.NewTTransportExceptionFromError(
fmt.Errorf("Not enough frame size %d to read %d bytes", p.FrameSize, 1))
}
c, err = p.Reader.ReadByte()
if err == nil {
p.FrameSize--
}
return
}
func (p *TServerUnixDomain) Accept() (thrift.TTransport, error) {
p.mu.RLock()
interrupted := p.interrupted
p.mu.RUnlock()
if interrupted {
return nil, errors.New("Transport Interrupted")
}
if p.listener == nil {
return nil, thrift.NewTTransportException(thrift.NOT_OPEN,
"No underlying server socket")
}
conn, err := p.listener.Accept()
if err != nil {
return nil, thrift.NewTTransportExceptionFromError(err)
}
return thrift.NewTSocketFromConnTimeout(conn, p.clientTimeout), nil
}