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<?php
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*
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* @package thrift.transport
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*/
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/**
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* Framed transport. Writes and reads data in chunks that are stamped with
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* their length.
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*
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* @package thrift.transport
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*/
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class TFramedTransport extends TTransport {
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/**
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* Underlying transport object.
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*
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* @var TTransport
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*/
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private $transport_;
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/**
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* Buffer for read data.
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*
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* @var string
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*/
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private $rBuf_;
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/**
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* Buffer for queued output data
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*
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* @var string
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*/
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private $wBuf_;
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/**
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* Whether to frame reads
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*
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* @var bool
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*/
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private $read_;
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/**
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* Whether to frame writes
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*
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* @var bool
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*/
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private $write_;
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/**
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* Constructor.
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*
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* @param TTransport $transport Underlying transport
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*/
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public function __construct($transport=null, $read=true, $write=true) {
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$this->transport_ = $transport;
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$this->read_ = $read;
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$this->write_ = $write;
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}
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public function isOpen() {
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return $this->transport_->isOpen();
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}
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public function open() {
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$this->transport_->open();
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}
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public function close() {
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$this->transport_->close();
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}
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/**
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* Reads from the buffer. When more data is required reads another entire
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* chunk and serves future reads out of that.
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*
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* @param int $len How much data
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*/
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public function read($len) {
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if (!$this->read_) {
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return $this->transport_->read($len);
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}
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if (strlen($this->rBuf_) === 0) {
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$this->readFrame();
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}
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// Just return full buff
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if ($len >= strlen($this->rBuf_)) {
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$out = $this->rBuf_;
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$this->rBuf_ = null;
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return $out;
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}
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// Return substr
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$out = substr($this->rBuf_, 0, $len);
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$this->rBuf_ = substr($this->rBuf_, $len);
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return $out;
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}
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/**
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* Put previously read data back into the buffer
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*
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* @param string $data data to return
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*/
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public function putBack($data) {
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if (strlen($this->rBuf_) === 0) {
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$this->rBuf_ = $data;
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} else {
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$this->rBuf_ = ($data . $this->rBuf_);
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}
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}
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/**
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* Reads a chunk of data into the internal read buffer.
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*/
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private function readFrame() {
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$buf = $this->transport_->readAll(4);
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$val = unpack('N', $buf);
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$sz = $val[1];
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$this->rBuf_ = $this->transport_->readAll($sz);
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}
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/**
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* Writes some data to the pending output buffer.
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*
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* @param string $buf The data
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* @param int $len Limit of bytes to write
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*/
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public function write($buf, $len=null) {
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if (!$this->write_) {
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return $this->transport_->write($buf, $len);
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}
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if ($len !== null && $len < strlen($buf)) {
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$buf = substr($buf, 0, $len);
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}
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$this->wBuf_ .= $buf;
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}
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/**
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* Writes the output buffer to the stream in the format of a 4-byte length
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* followed by the actual data.
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*/
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public function flush() {
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if (!$this->write_ || strlen($this->wBuf_) == 0) {
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return $this->transport_->flush();
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}
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$out = pack('N', strlen($this->wBuf_));
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$out .= $this->wBuf_;
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// Note that we clear the internal wBuf_ prior to the underlying write
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// to ensure we're in a sane state (i.e. internal buffer cleaned)
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// if the underlying write throws up an exception
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$this->wBuf_ = '';
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$this->transport_->write($out);
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$this->transport_->flush();
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}
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}
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