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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 thrift
import (
"bytes"
"encoding/binary"
)
type TFramedTransport struct {
transport TTransport
writeBuffer *bytes.Buffer
readBuffer *bytes.Buffer
}
type tFramedTransportFactory struct {
factory TTransportFactory
}
func NewTFramedTransportFactory(factory TTransportFactory) TTransportFactory {
return &tFramedTransportFactory{factory: factory}
}
func (p *tFramedTransportFactory) GetTransport(base TTransport) TTransport {
return NewTFramedTransport(p.factory.GetTransport(base))
}
func NewTFramedTransport(transport TTransport) *TFramedTransport {
writeBuf := make([]byte, 0, 1024)
readBuf := make([]byte, 0, 1024)
return &TFramedTransport{transport: transport, writeBuffer: bytes.NewBuffer(writeBuf), readBuffer: bytes.NewBuffer(readBuf)}
}
func (p *TFramedTransport) Open() error {
return p.transport.Open()
}
func (p *TFramedTransport) IsOpen() bool {
return p.transport.IsOpen()
}
func (p *TFramedTransport) Peek() bool {
return p.transport.Peek()
}
func (p *TFramedTransport) Close() error {
return p.transport.Close()
}
func (p *TFramedTransport) Read(buf []byte) (int, error) {
if p.readBuffer.Len() > 0 {
got, err := p.readBuffer.Read(buf)
if got > 0 {
return got, NewTTransportExceptionFromOsError(err)
}
}
// Read another frame of data
p.readFrame()
got, err := p.readBuffer.Read(buf)
return got, NewTTransportExceptionFromOsError(err)
}
func (p *TFramedTransport) ReadAll(buf []byte) (int, error) {
return ReadAllTransport(p, buf)
}
func (p *TFramedTransport) Write(buf []byte) (int, error) {
n, err := p.writeBuffer.Write(buf)
return n, NewTTransportExceptionFromOsError(err)
}
func (p *TFramedTransport) Flush() error {
size := p.writeBuffer.Len()
buf := []byte{0, 0, 0, 0}
binary.BigEndian.PutUint32(buf, uint32(size))
_, err := p.transport.Write(buf)
if err != nil {
return NewTTransportExceptionFromOsError(err)
}
if size > 0 {
n, err := p.writeBuffer.WriteTo(p.transport)
if err != nil {
print("Error while flushing write buffer of size ", size, " to transport, only wrote ", n, " bytes: ", err.Error(), "\n")
return NewTTransportExceptionFromOsError(err)
}
}
err = p.transport.Flush()
return NewTTransportExceptionFromOsError(err)
}
func (p *TFramedTransport) readFrame() (int, error) {
buf := []byte{0, 0, 0, 0}
_, err := p.transport.ReadAll(buf)
if err != nil {
return 0, err
}
size := int(binary.BigEndian.Uint32(buf))
if size < 0 {
// TODO(pomack) log error
return 0, NewTTransportException(UNKNOWN_TRANSPORT_EXCEPTION, "Read a negative frame size ("+string(size)+")")
}
if size == 0 {
return 0, nil
}
buf2 := make([]byte, size)
n, err := p.transport.ReadAll(buf2)
if err != nil {
return n, err
}
p.readBuffer = bytes.NewBuffer(buf2)
return size, nil
}
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