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transport.go
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transport.go
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// Copyright (c) 2015 Uber Technologies, Inc.
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package thrift
import (
"errors"
"io"
"sync"
"github.com/uber/tchannel-go/thirdparty/github.com/apache/thrift/lib/go/thrift"
)
// readerWriterTransport is a transport that reads and writes from the underlying Reader/Writer.
type readWriterTransport struct {
io.Writer
io.Reader
readBuf [1]byte
writeBuf [1]byte
strBuf []byte
}
var errNoBytesRead = errors.New("no bytes read")
func (t *readWriterTransport) Open() error {
return nil
}
func (t *readWriterTransport) Flush() error {
return nil
}
func (t *readWriterTransport) IsOpen() bool {
return true
}
func (t *readWriterTransport) Close() error {
return nil
}
func (t *readWriterTransport) ReadByte() (byte, error) {
v := t.readBuf[0:1]
var n int
var err error
for {
n, err = t.Read(v)
if n > 0 || err != nil {
break
}
}
if err == io.EOF && n > 0 {
err = nil
}
return v[0], err
}
func (t *readWriterTransport) WriteByte(b byte) error {
v := t.writeBuf[:1]
v[0] = b
_, err := t.Write(v)
return err
}
func (t *readWriterTransport) WriteString(s string) (int, error) {
// TODO switch to io.StringWriter once we don't need to support < 1.12
type stringWriter interface{ WriteString(string) (int, error) }
if sw, ok := t.Writer.(stringWriter); ok {
return sw.WriteString(s)
}
// This path frequently taken since thrift.TBinaryProtocol calls
// WriteString a lot, but fragmentingWriter does not implement WriteString;
// furthermore it is difficult to add a dual WriteString path to
// fragmentingWriter, since hash checksumming does not accept strings.
//
// Without this, io.WriteString ends up allocating every time.
b := append(t.strBuf[:0], s...)
t.strBuf = b[:0]
return t.Writer.Write(b)
}
// RemainingBytes returns the max number of bytes (same as Thrift's StreamTransport) as we
// do not know how many bytes we have left.
func (t *readWriterTransport) RemainingBytes() uint64 {
const maxSize = ^uint64(0)
return maxSize
}
var _ thrift.TRichTransport = &readWriterTransport{}
type thriftProtocol struct {
transport *readWriterTransport
protocol *thrift.TBinaryProtocol
}
var thriftProtocolPool = sync.Pool{
New: func() interface{} {
transport := &readWriterTransport{}
protocol := thrift.NewTBinaryProtocolTransport(transport)
return &thriftProtocol{transport, protocol}
},
}
func getProtocolWriter(writer io.Writer) *thriftProtocol {
wp := thriftProtocolPool.Get().(*thriftProtocol)
wp.transport.Reader = nil
wp.transport.Writer = writer
return wp
}
func getProtocolReader(reader io.Reader) *thriftProtocol {
wp := thriftProtocolPool.Get().(*thriftProtocol)
wp.transport.Reader = reader
wp.transport.Writer = nil
return wp
}