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<?php |
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namespace Webdcg\Redis\Traits; |
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/** |
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* Support for Redis Stream Data Structure |
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* |
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* See: https://redis.io/topics/streams-intro |
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* See: https://university.redislabs.com/courses |
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*/ |
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trait Streams |
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{ |
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/** |
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* Acknowledge one or more pending messages. |
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* |
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* See: https://redis.io/commands/xack. |
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* |
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* @param string $stream |
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* @param string $group |
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* @param array $messages |
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* |
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* @return int The number of messages Redis reports as acknowledged. |
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*/ |
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public function xAck(string $stream, string $group, array $messages): int |
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{ |
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return $this->redis->xAck($stream, $group, $messages); |
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} |
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/** |
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* Appends the specified stream entry to the stream at the specified key. |
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* If the key does not exist, as a side effect of running this command the |
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* key is created with a stream value. |
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* |
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* See: https://redis.io/commands/xadd. |
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* |
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* @param string $key |
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* @param string $id |
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* @param array $message |
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* @param int|integer $maxLenght |
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* @param bool $approximate |
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* |
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* @return string The added message ID |
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*/ |
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public function xAdd( |
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string $key, |
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string $id, |
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array $message, |
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?int $maxLenght = null, |
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?bool $approximate = null |
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): string { |
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if (is_null($maxLenght) && is_null($approximate)) { |
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return $this->redis->xAdd($key, $id, $message); |
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} |
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return is_null($approximate) ? |
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$this->redis->xAdd($key, $id, $message, $maxLenght) : |
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$this->redis->xAdd($key, $id, $message, $maxLenght, $approximate); |
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} |
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/** |
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* Claim ownership of one or more pending messages. |
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* |
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* See: https://redis.io/commands/xclaim. |
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* |
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* Note: 'TIME', and 'IDLE' are mutually exclusive |
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* |
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* 'IDLE' => $value, Set the idle time to $value ms |
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* 'TIME' => $value, Set the idle time to now - $value |
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* 'RETRYCOUNT' => $value, Update message retrycount to $value |
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* 'FORCE', Claim the message(s) even if they're not pending anywhere |
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* 'JUSTID',Instruct Redis to only return IDs |
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* |
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* @param string $stream |
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* @param string $group |
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* @param string $consumer |
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* @param int $minIdleTime |
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* @param array $messageIds |
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* @param array|null $options |
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* |
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* @return array Either an array of message IDs along with |
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* corresponding data, or just an array of |
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* IDs (if the 'JUSTID' option was passed). |
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*/ |
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public function xClaim( |
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string $stream, |
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string $group, |
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string $consumer, |
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int $minIdleTime, |
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array $messageIds, |
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?array $options = null |
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): array { |
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if (!is_null($options) && !$this->_checkClaimOptions($options)) { |
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throw new \Exception("Bad Claim Options", 1); |
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} |
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return is_null($options) ? |
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$this->redis->xClaim($stream, $group, $consumer, $minIdleTime, $messageIds) : |
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$this->redis->xClaim($stream, $group, $consumer, $minIdleTime, $messageIds, $options); |
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} |
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/** |
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* Delete one or more messages from a stream. |
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* |
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* See: https://redis.io/commands/xdel. |
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* |
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* @param string $stream |
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* @param array $messageIds |
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* |
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* @return int The number of messages removed. |
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*/ |
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public function xDel(string $stream, array $messageIds): int |
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{ |
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return $this->redis->xDel($stream, $messageIds); |
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} |
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/** |
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* This command is used in order to create, destroy, or manage consumer groups. |
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* |
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* See: https://redis.io/commands/xgroup. |
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* |
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* @param string $command |
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* @param string|null $stream |
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* @param string|null $group |
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* @param string|null $messageId_consumerName |
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* @param bool|boolean $makeStream |
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* |
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* @return mixed This command returns different |
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* types depending on the specific |
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* XGROUP command executed. |
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*/ |
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public function xGroup( |
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string $command, |
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?string $stream = null, |
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?string $group = null, |
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?string $messageId_consumerName = null, |
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bool $makeStream = false |
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) { |
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$command = strtoupper($command); |
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if (!$this->_checkGroupCommands($command)) { |
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throw new \Exception("Bad Group Command", 1); |
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} |
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switch ($command) { |
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case 'CREATE': |
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return $this->redis->xGroup($command, $stream, $group, $messageId_consumerName, $makeStream); |
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case 'SETID': |
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return $this->redis->xGroup($command, $stream, $group, $messageId_consumerName); |
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case 'DESTROY': |
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return $this->redis->xGroup($command, $stream, $group); |
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case 'DELCONSUMER': |
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return $this->redis->xGroup($command, $stream, $group, $messageId_consumerName); |
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} |
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return $this->redis->xGroup($command); |
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} |
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/** |
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* Get information about a stream or consumer groups. |
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* |
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* See: https://redis.io/commands/xinfo. |
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* |
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* @param string $command |
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* @param string $stream |
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* @param string $group |
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* |
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* @return mixed This command returns different types depending on which subcommand is used. |
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*/ |
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public function xInfo(string $command, ?string $stream = null, ?string $group = null) |
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{ |
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$command = strtoupper($command); |
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if (!$this->_checkInfoCommands($command)) { |
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throw new \Exception("Bad Info Command", 1); |
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} |
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if (is_null($stream) && is_null($group)) { |
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return $this->redis->xInfo($command); |
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} |
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return is_null($group) ? |
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$this->redis->xInfo($command, $stream) : |
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$this->redis->xInfo($command, $stream, $group); |
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} |
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/** |
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* Get the length of a given stream. |
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* |
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* See: https://redis.io/commands/xlen. |
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* |
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* @param string $stream |
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* |
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* @return The number of messages in the stream. |
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*/ |
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public function xLen(string $stream): int |
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{ |
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return $this->redis->xLen($stream); |
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} |
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/** |
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* Get information about pending messages in a given stream. |
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* |
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* See: https://redis.io/commands/xpending. |
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* |
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* @param string $stream |
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* @param string $group |
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* @param string|null $start |
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* @param string|null $end |
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* @param int|null $count |
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* @param string|null $consumer |
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* |
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* @return array Information about the pending messages, |
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* in various forms depending on the specific |
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* invocation of XPENDING. |
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*/ |
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public function xPending( |
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string $stream, |
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string $group, |
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?string $start = null, |
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?string $end = null, |
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?int $count = null, |
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?string $consumer = null |
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): array { |
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return is_null($start) || is_null($end) || is_null($count) || is_null($consumer) ? |
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$this->redis->xPending($stream, $group) : |
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$this->redis->xPending($stream, $group, $start, $end, $count, $consumer); |
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} |
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/** |
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* Get a range of messages from a given stream. |
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* |
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* See: https://redis.io/commands/xrange. |
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* |
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* @param string $stream |
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* @param string $start |
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* @param string $end |
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* @param int|null $count |
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* |
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* @return array The messages in the stream within the requested range. |
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*/ |
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public function xRange(string $stream, string $start, string $end, ?int $count = null): array |
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{ |
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return is_null($count) ? |
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$this->redis->xRange($stream, $start, $end) : |
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$this->redis->xRange($stream, $start, $end, $count); |
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} |
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/** |
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* Read data from one or more streams and only return IDs greater than sent in the command. |
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* |
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* See: https://redis.io/commands/xread. |
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* |
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* @param array $streams |
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* @param int|null $count |
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* @param int|null $block |
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* |
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* @return array The messages in the stream newer than the IDs passed to Redis (if any). |
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*/ |
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public function xRead(array $streams, ?int $count = null, ?int $block = null): array |
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{ |
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if (!is_null($count) && !is_null($block)) { |
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return $this->redis->xRead($streams, $count, $block); |
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} |
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return is_null($count) ? $this->redis->xRead($streams) : $this->redis->xRead($streams, $count); |
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} |
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/** |
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* This method is similar to xRead except that it supports reading messages for a specific consumer group. |
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* |
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* See: https://redis.io/commands/xreadgroup. |
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* |
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* @param string $group |
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* @param string $consumer |
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* @param array $streams |
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* @param int|null $count |
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* @param int|null $block |
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* |
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* @return array The messages delivered to this consumer group (if any). |
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*/ |
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public function xReadGroup( |
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string $group, |
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string $consumer, |
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array $streams, |
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?int $count = null, |
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?int $block = null |
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): array { |
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if (!is_null($count) && !is_null($block)) { |
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return $this->redis->xReadGroup($group, $consumer, $streams, $count, $block); |
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} |
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return is_null($count) ? |
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$this->redis->xReadGroup($group, $consumer, $streams) : |
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$this->redis->xReadGroup($group, $consumer, $streams, $count); |
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} |
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/** |
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* This is identical to xRange except the results come back in reverse order. |
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* Also note that Redis reverses the order of "start" and "end". |
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* |
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* See: https://redis.io/commands/xrevrange. |
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* |
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* @param string $stream |
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* @param string $end |
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* @param string $start |
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* @param int|null $count |
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* |
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* @return array The messages in the range specified. |
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*/ |
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public function xRevRange(string $stream, string $end, string $start, ?int $count = null): array |
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{ |
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return is_null($count) ? |
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$this->redis->xRevRange($stream, $end, $start) : |
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$this->redis->xRevRange($stream, $end, $start, $count); |
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} |
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/** |
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* Trim the stream length to a given maximum. If the "approximate" flag is |
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* pasesed, Redis will use your size as a hint but only trim trees in whole |
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* nodes (this is more efficient). |
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* |
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* See: https://redis.io/commands/xtrim. |
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* |
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* @param string $stream |
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* @param int $maxLenght |
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* @param bool|null $approximate |
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* |
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* @return int The number of messages trimmed from the stream. |
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*/ |
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public function xTrim(string $stream, int $maxLenght, ?bool $approximate = null): int |
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{ |
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return is_null($approximate) ? |
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$this->redis->xTrim($stream, $maxLenght) : |
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$this->redis->xTrim($stream, $maxLenght, $approximate); |
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} |
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/** |
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* ************************************************************************ |
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* H E L P E R F U N C T I O N S |
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* ************************************************************************ |
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*/ |
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/** |
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* Claim Options available |
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* |
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* Note: 'TIME', and 'IDLE' are mutually exclusive |
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* |
362
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* 'IDLE' => $value, Set the idle time to $value ms |
363
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* 'TIME' => $value, Set the idle time to now - $value |
364
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|
|
* 'RETRYCOUNT' => $value, Update message retrycount to $value |
365
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|
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* 'FORCE', Claim the message(s) even if they're not pending anywhere |
366
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|
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* 'JUSTID',Instruct Redis to only return IDs |
367
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* |
368
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|
* @param array $options |
369
|
|
|
* |
370
|
|
|
* @return bool |
371
|
|
|
*/ |
372
|
|
|
private function _checkClaimOptions(array $options): bool |
373
|
|
|
{ |
374
|
|
|
foreach ($options as $key => $value) { |
375
|
|
|
$check = is_numeric($key) ? $value : $key; |
376
|
|
|
if (!in_array($check, ['IDLE', 'TIME', 'RETRYCOUNT', 'FORCE', 'JUSTID'])) { |
377
|
|
|
return false; |
378
|
|
|
} |
379
|
|
|
} |
380
|
|
|
|
381
|
|
|
return !(array_key_exists('IDLE', $options) && array_key_exists('TIME', $options)); |
382
|
|
|
} |
383
|
|
|
|
384
|
|
|
|
385
|
|
|
/** |
386
|
|
|
* [_checkInfoCommands description] |
387
|
|
|
* |
388
|
|
|
* @param string $command |
389
|
|
|
* |
390
|
|
|
* @return bool |
391
|
|
|
*/ |
392
|
|
|
private function _checkInfoCommands(string $command): bool |
393
|
|
|
{ |
394
|
|
|
return in_array($command, ['CONSUMERS', 'GROUPS', 'STREAM', 'HELP'], true); |
395
|
|
|
} |
396
|
|
|
|
397
|
|
|
/** |
398
|
|
|
* [_checkGroupCommands description] |
399
|
|
|
* |
400
|
|
|
* @param string $command |
401
|
|
|
* |
402
|
|
|
* @return bool |
403
|
|
|
*/ |
404
|
|
|
private function _checkGroupCommands(string $command): bool |
405
|
|
|
{ |
406
|
|
|
return in_array($command, ['HELP', 'CREATE', 'SETID', 'DESTROY', 'DELCONSUMER'], true); |
407
|
|
|
} |
408
|
|
|
} |
409
|
|
|
|
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: