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<?php
/*
* 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.transport
*/
namespace Thrift\Transport;
use Thrift\Factory\TStringFuncFactory;
/**
* Framed transport. Writes and reads data in chunks that are stamped with
* their length.
*
* @package thrift.transport
*/
class TFramedTransport extends TTransport
{
/**
* Underlying transport object.
*
* @var TTransport
*/
private $transport_;
/**
* Buffer for read data.
*
* @var string
*/
private $rBuf_;
/**
* Buffer for queued output data
*
* @var string
*/
private $wBuf_;
/**
* Whether to frame reads
*
* @var bool
*/
private $read_;
/**
* Whether to frame writes
*
* @var bool
*/
private $write_;
/**
* Constructor.
*
* @param TTransport $transport Underlying transport
*/
public function __construct($transport = null, $read = true, $write = true)
{
$this->transport_ = $transport;
$this->read_ = $read;
$this->write_ = $write;
}
public function isOpen()
{
return $this->transport_->isOpen();
}
public function open()
{
$this->transport_->open();
}
public function close()
{
$this->transport_->close();
}
/**
* Reads from the buffer. When more data is required reads another entire
* chunk and serves future reads out of that.
*
* @param int $len How much data
*/
public function read($len)
{
if (!$this->read_) {
return $this->transport_->read($len);
}
if (TStringFuncFactory::create()->strlen($this->rBuf_) === 0) {
$this->readFrame();
}
// Just return full buff
if ($len >= TStringFuncFactory::create()->strlen($this->rBuf_)) {
$out = $this->rBuf_;
$this->rBuf_ = null;
return $out;
}
// Return TStringFuncFactory::create()->substr
$out = TStringFuncFactory::create()->substr($this->rBuf_, 0, $len);
$this->rBuf_ = TStringFuncFactory::create()->substr($this->rBuf_, $len);
return $out;
}
/**
* Put previously read data back into the buffer
*
* @param string $data data to return
*/
public function putBack($data)
{
if (TStringFuncFactory::create()->strlen($this->rBuf_) === 0) {
$this->rBuf_ = $data;
} else {
$this->rBuf_ = ($data . $this->rBuf_);
}
}
/**
* Reads a chunk of data into the internal read buffer.
*/
private function readFrame()
{
$buf = $this->transport_->readAll(4);
$val = unpack('N', $buf);
$sz = $val[1];
$this->rBuf_ = $this->transport_->readAll($sz);
}
/**
* Writes some data to the pending output buffer.
*
* @param string $buf The data
* @param int $len Limit of bytes to write
*/
public function write($buf, $len = null)
{
if (!$this->write_) {
return $this->transport_->write($buf, $len);
}
if ($len !== null && $len < TStringFuncFactory::create()->strlen($buf)) {
$buf = TStringFuncFactory::create()->substr($buf, 0, $len);
}
$this->wBuf_ .= $buf;
}
/**
* Writes the output buffer to the stream in the format of a 4-byte length
* followed by the actual data.
*/
public function flush()
{
if (!$this->write_ || TStringFuncFactory::create()->strlen($this->wBuf_) == 0) {
return $this->transport_->flush();
}
$out = pack('N', TStringFuncFactory::create()->strlen($this->wBuf_));
$out .= $this->wBuf_;
// Note that we clear the internal wBuf_ prior to the underlying write
// to ensure we're in a sane state (i.e. internal buffer cleaned)
// if the underlying write throws up an exception
$this->wBuf_ = '';
$this->transport_->write($out);
$this->transport_->flush();
}
}
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