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<?php |
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declare(strict_types=1); |
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namespace roxblnfk\SmartStream\Stream; |
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use Generator; |
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use Psr\Http\Message\StreamInterface; |
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final class GeneratorStream implements StreamInterface |
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{ |
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public const READ_MODE_AS_IS = 1; |
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public const READ_MODE_FIRST_YIELD = 2; |
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private int $readMode = self::READ_MODE_AS_IS; |
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private ?Generator $stream; |
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private bool $readable = true; |
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private ?int $size = null; |
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private int $caret = 0; |
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private bool $started = false; |
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public function __construct(Generator $body) |
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{ |
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$this->stream = $body; |
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} |
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public function __toString(): string |
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{ |
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try { |
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return $this->getContents(); |
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} catch (\Exception $e) { |
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return ''; |
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} |
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} |
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public function close(): void |
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{ |
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if ($this->stream !== null) { |
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$this->detach(); |
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} |
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} |
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public function detach() |
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{ |
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if ($this->stream === null) { |
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return null; |
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} |
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$this->stream; |
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$this->stream = null; |
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$this->size = null; |
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$this->caret = 0; |
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$this->started = false; |
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$this->readable = false; |
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return null; |
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} |
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public function getSize(): ?int |
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{ |
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if (null !== $this->size) { |
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return $this->size; |
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} |
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if ($this->stream === null) { |
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return null; |
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} |
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return null; |
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} |
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public function tell(): int |
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{ |
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return $this->caret; |
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} |
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public function eof(): bool |
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{ |
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return $this->stream === null || !$this->stream->valid(); |
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} |
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public function isSeekable(): bool |
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{ |
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return false; |
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} |
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public function seek($offset, $whence = \SEEK_SET): void |
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{ |
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throw new \RuntimeException('Stream is not seekable'); |
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} |
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public function rewind(): void |
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{ |
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if ($this->stream !== null) { |
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$this->stream->rewind(); |
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} |
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$this->caret = 0; |
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$this->started = false; |
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} |
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public function isWritable(): bool |
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{ |
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return false; |
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} |
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public function write($string): int |
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{ |
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throw new \RuntimeException('Cannot write to a non-writable stream'); |
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} |
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public function isReadable(): bool |
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{ |
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return $this->readable; |
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} |
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public function read($length): string |
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{ |
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if (!$this->readable) { |
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throw new \RuntimeException('Cannot read from non-readable stream'); |
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} |
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if ($this->eof()) { |
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throw new \RuntimeException('Cannot read from ended stream'); |
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} |
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if (!$this->started) { |
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$this->started = true; |
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$read = (string)$this->stream->current(); |
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$this->caret += strlen($read); |
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return $read; |
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} |
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if ($this->readMode === self::READ_MODE_FIRST_YIELD) { |
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$content = ''; |
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while (!$this->eof()) { |
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$content .= $this->stream->send(null); |
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} |
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return $content; |
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} |
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$read = (string)$this->stream->send(null); |
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$this->caret += strlen($read); |
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if ($this->eof()) { |
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$this->size = $this->caret; |
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} |
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return $read; |
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} |
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public function getContents(): string |
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{ |
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if ($this->stream === null) { |
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throw new \RuntimeException('Unable to read stream contents'); |
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} |
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$content = ''; |
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while (!$this->eof()) { |
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$content .= $this->read(PHP_INT_MAX); |
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} |
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return $content; |
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} |
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public function getMetadata($key = null) |
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{ |
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if ($this->stream === null) { |
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return $key ? null : []; |
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} |
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$meta = [ |
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'seekable' => $this->isSeekable(), |
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'eof' => $this->eof(), |
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]; |
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if (null === $key) { |
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return $meta; |
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} |
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return $meta[$key] ?? null; |
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} |
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} |
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roxblnfk /
smart-stream
