171 lines
4.0 KiB
PHP
171 lines
4.0 KiB
PHP
<?php
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namespace GuzzleHttp\Psr7;
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use Psr\Http\Message\StreamInterface;
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/**
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* Provides a read only stream that pumps data from a PHP callable.
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*
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* When invoking the provided callable, the PumpStream will pass the amount of
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* data requested to read to the callable. The callable can choose to ignore
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* this value and return fewer or more bytes than requested. Any extra data
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* returned by the provided callable is buffered internally until drained using
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* the read() function of the PumpStream. The provided callable MUST return
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* false when there is no more data to read.
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*
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* @final
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*/
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class PumpStream implements StreamInterface
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{
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/** @var callable */
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private $source;
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/** @var int */
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private $size;
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/** @var int */
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private $tellPos = 0;
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/** @var array */
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private $metadata;
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/** @var BufferStream */
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private $buffer;
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/**
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* @param callable $source Source of the stream data. The callable MAY
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* accept an integer argument used to control the
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* amount of data to return. The callable MUST
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* return a string when called, or false on error
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* or EOF.
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* @param array $options Stream options:
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* - metadata: Hash of metadata to use with stream.
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* - size: Size of the stream, if known.
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*/
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public function __construct(callable $source, array $options = [])
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{
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$this->source = $source;
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$this->size = isset($options['size']) ? $options['size'] : null;
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$this->metadata = isset($options['metadata']) ? $options['metadata'] : [];
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$this->buffer = new BufferStream();
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}
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public function __toString()
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{
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try {
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return Utils::copyToString($this);
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} catch (\Exception $e) {
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return '';
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}
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}
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public function close()
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{
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$this->detach();
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}
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public function detach()
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{
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$this->tellPos = false;
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$this->source = null;
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return null;
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}
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public function getSize()
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{
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return $this->size;
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}
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public function tell()
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{
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return $this->tellPos;
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}
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public function eof()
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{
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return !$this->source;
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}
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public function isSeekable()
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{
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return false;
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}
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public function rewind()
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{
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$this->seek(0);
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}
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public function seek($offset, $whence = SEEK_SET)
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{
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throw new \RuntimeException('Cannot seek a PumpStream');
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}
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public function isWritable()
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{
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return false;
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}
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public function write($string)
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{
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throw new \RuntimeException('Cannot write to a PumpStream');
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}
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public function isReadable()
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{
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return true;
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}
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public function read($length)
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{
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$data = $this->buffer->read($length);
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$readLen = strlen($data);
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$this->tellPos += $readLen;
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$remaining = $length - $readLen;
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if ($remaining) {
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$this->pump($remaining);
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$data .= $this->buffer->read($remaining);
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$this->tellPos += strlen($data) - $readLen;
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}
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return $data;
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}
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public function getContents()
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{
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$result = '';
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while (!$this->eof()) {
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$result .= $this->read(1000000);
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}
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return $result;
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}
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public function getMetadata($key = null)
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{
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if (!$key) {
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return $this->metadata;
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}
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return isset($this->metadata[$key]) ? $this->metadata[$key] : null;
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}
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private function pump($length)
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{
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if ($this->source) {
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do {
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$data = call_user_func($this->source, $length);
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if ($data === false || $data === null) {
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$this->source = null;
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return;
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}
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$this->buffer->write($data);
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$length -= strlen($data);
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} while ($length > 0);
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}
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}
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}
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