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<?php |
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namespace React\Promise\Stream; |
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use Evenement\EventEmitter; |
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use InvalidArgumentException; |
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use React\Promise\CancellablePromiseInterface; |
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use React\Promise\PromiseInterface; |
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use React\Stream\WritableStreamInterface; |
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/** |
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* @internal |
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* @see unwrapWritable() instead |
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*/ |
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class UnwrapWritableStream extends EventEmitter implements WritableStreamInterface |
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{ |
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private $promise; |
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private $stream; |
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private $buffer = array(); |
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private $closed = false; |
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private $ending = false; |
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/** |
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* Instantiate new unwrapped writable stream for given `Promise` which resolves with a `WritableStreamInterface`. |
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* |
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* @param PromiseInterface $promise Promise<WritableStreamInterface, Exception> |
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*/ |
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public function __construct(PromiseInterface $promise) |
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{ |
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$out = $this; |
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$store =& $this->stream; |
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$buffer =& $this->buffer; |
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$ending =& $this->ending; |
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$closed =& $this->closed; |
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$this->promise = $promise->then( |
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function ($stream) { |
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if (!$stream instanceof WritableStreamInterface) { |
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throw new InvalidArgumentException('Not a writable stream'); |
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} |
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return $stream; |
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} |
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)->then( |
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function (WritableStreamInterface $stream) use ($out, &$store, &$buffer, &$ending, &$closed) { |
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// stream is already closed, make sure to close output stream |
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if (!$stream->isWritable()) { |
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$out->close(); |
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return $stream; |
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} |
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// resolves but output is already closed, make sure to close stream silently |
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if ($closed) { |
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$stream->close(); |
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return $stream; |
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} |
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// forward drain events for back pressure |
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$stream->on('drain', function () use ($out) { |
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$out->emit('drain', array($out)); |
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}); |
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// error events cancel output stream |
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$stream->on('error', function ($error) use ($out) { |
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$out->emit('error', array($error, $out)); |
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$out->close(); |
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}); |
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// close both streams once either side closes |
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$stream->on('close', array($out, 'close')); |
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$out->on('close', array($stream, 'close')); |
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if ($buffer) { |
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// flush buffer to stream and check if its buffer is not exceeded |
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$drained = true; |
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foreach ($buffer as $chunk) { |
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if (!$stream->write($chunk)) { |
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$drained = false; |
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} |
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} |
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$buffer = array(); |
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if ($drained) { |
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// signal drain event, because the output stream previous signalled a full buffer |
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$out->emit('drain', array($out)); |
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} |
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} |
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if ($ending) { |
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$stream->end(); |
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} else { |
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$store = $stream; |
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} |
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return $stream; |
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}, |
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function ($e) use ($out, &$closed) { |
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if (!$closed) { |
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$out->emit('error', array($e, $out)); |
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$out->close(); |
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} |
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} |
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); |
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} |
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public function write($data) |
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{ |
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if ($this->ending) { |
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return false; |
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} |
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// forward to inner stream if possible |
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if ($this->stream !== null) { |
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return $this->stream->write($data); |
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} |
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// append to buffer and signal the buffer is full |
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$this->buffer[] = $data; |
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return false; |
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} |
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public function end($data = null) |
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{ |
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if ($this->ending) { |
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return; |
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} |
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$this->ending = true; |
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// forward to inner stream if possible |
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if ($this->stream !== null) { |
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return $this->stream->end($data); |
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} |
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// append to buffer |
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if ($data !== null) { |
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$this->buffer[] = $data; |
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} |
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} |
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public function isWritable() |
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{ |
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return !$this->ending; |
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} |
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public function close() |
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{ |
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if ($this->closed) { |
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return; |
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} |
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$this->buffer = array(); |
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$this->ending = true; |
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$this->closed = true; |
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// try to cancel promise once the stream closes |
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if ($this->promise instanceof CancellablePromiseInterface) { |
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$this->promise->cancel(); |
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} |
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$this->promise = $this->stream = null; |
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$this->emit('close'); |
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$this->removeAllListeners(); |
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} |
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} |
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deployphp /
deployer
