<?php
/**
* Connection class file
*
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db\redis;
use \yii\base\Component;
use yii\base\InvalidConfigException;
use \yii\db\Exception;
use yii\helpers\Inflector;
use yii\helpers\StringHelper;
/**
*
* @method mixed set($key, $value) Set the string value of a key
* @method mixed get($key) Set the string value of a key
* TODO document methods
*
* @property string $driverName Name of the DB driver.
* @property boolean $isActive Whether the DB connection is established.
* @property Transaction $transaction The currently active transaction. Null if no active transaction.
*
* @author Carsten Brandt < mail @ cebe . cc >
* @since 2.0
*/
class Connection extends Component
{
/**
* @event Event an event that is triggered after a DB connection is established
*/
const EVENT_AFTER_OPEN = 'afterOpen';
/**
* @var string the Data Source Name, or DSN, contains the information required to connect to the database.
* DSN format: redis://server:port[/db]
* Where db is a zero based integer which refers to the DB to use.
* If no DB is given, ID 0 is used.
*
* Example: redis://localhost:6379/2
*/
public $dsn;
/**
* @var string the password for establishing DB connection. Defaults to null meaning no AUTH command is send.
* See http://redis.io/commands/auth
*/
public $password;
/**
* @var float timeout to use for connection to redis. If not set the timeout set in php.ini will be used: ini_get("default_socket_timeout")
*/
public $connectionTimeout = null;
/**
* @var float timeout to use for redis socket when reading and writing data. If not set the php default value will be used.
*/
public $dataTimeout = null;
/**
* @var array List of available redis commands http://redis.io/commands
*/
public $redisCommands = array(
'BRPOP', // key [key ...] timeout Remove and get the last element in a list, or block until one is available
'BRPOPLPUSH', // source destination timeout Pop a value from a list, push it to another list and return it; or block until one is available
'CLIENT KILL', // ip:port Kill the connection of a client
'CLIENT LIST', // Get the list of client connections
'CLIENT GETNAME', // Get the current connection name
'CLIENT SETNAME', // connection-name Set the current connection name
'CONFIG GET', // parameter Get the value of a configuration parameter
'CONFIG SET', // parameter value Set a configuration parameter to the given value
'CONFIG RESETSTAT', // Reset the stats returned by INFO
'DBSIZE', // Return the number of keys in the selected database
'DEBUG OBJECT', // key Get debugging information about a key
'DEBUG SEGFAULT', // Make the server crash
'DECR', // key Decrement the integer value of a key by one
'DECRBY', // key decrement Decrement the integer value of a key by the given number
'DEL', // key [key ...] Delete a key
'DISCARD', // Discard all commands issued after MULTI
'DUMP', // key Return a serialized version of the value stored at the specified key.
'ECHO', // message Echo the given string
'EVAL', // script numkeys key [key ...] arg [arg ...] Execute a Lua script server side
'EVALSHA', // sha1 numkeys key [key ...] arg [arg ...] Execute a Lua script server side
'EXEC', // Execute all commands issued after MULTI
'EXISTS', // key Determine if a key exists
'EXPIRE', // key seconds Set a key's time to live in seconds
'EXPIREAT', // key timestamp Set the expiration for a key as a UNIX timestamp
'FLUSHALL', // Remove all keys from all databases
'FLUSHDB', // Remove all keys from the current database
'GET', // key Get the value of a key
'GETBIT', // key offset Returns the bit value at offset in the string value stored at key
'GETRANGE', // key start end Get a substring of the string stored at a key
'GETSET', // key value Set the string value of a key and return its old value
'HDEL', // key field [field ...] Delete one or more hash fields
'HEXISTS', // key field Determine if a hash field exists
'HGET', // key field Get the value of a hash field
'HGETALL', // key Get all the fields and values in a hash
'HINCRBY', // key field increment Increment the integer value of a hash field by the given number
'HINCRBYFLOAT', // key field increment Increment the float value of a hash field by the given amount
'HKEYS', // key Get all the fields in a hash
'HLEN', // key Get the number of fields in a hash
'HMGET', // key field [field ...] Get the values of all the given hash fields
'HMSET', // key field value [field value ...] Set multiple hash fields to multiple values
'HSET', // key field value Set the string value of a hash field
'HSETNX', // key field value Set the value of a hash field, only if the field does not exist
'HVALS', // key Get all the values in a hash
'INCR', // key Increment the integer value of a key by one
'INCRBY', // key increment Increment the integer value of a key by the given amount
'INCRBYFLOAT', // key increment Increment the float value of a key by the given amount
'INFO', // [section] Get information and statistics about the server
'KEYS', // pattern Find all keys matching the given pattern
'LASTSAVE', // Get the UNIX time stamp of the last successful save to disk
'LINDEX', // key index Get an element from a list by its index
'LINSERT', // key BEFORE|AFTER pivot value Insert an element before or after another element in a list
'LLEN', // key Get the length of a list
'LPOP', // key Remove and get the first element in a list
'LPUSH', // key value [value ...] Prepend one or multiple values to a list
'LPUSHX', // key value Prepend a value to a list, only if the list exists
'LRANGE', // key start stop Get a range of elements from a list
'LREM', // key count value Remove elements from a list
'LSET', // key index value Set the value of an element in a list by its index
'LTRIM', // key start stop Trim a list to the specified range
'MGET', // key [key ...] Get the values of all the given keys
'MIGRATE', // host port key destination-db timeout Atomically transfer a key from a Redis instance to another one.
'MONITOR', // Listen for all requests received by the server in real time
'MOVE', // key db Move a key to another database
'MSET', // key value [key value ...] Set multiple keys to multiple values
'MSETNX', // key value [key value ...] Set multiple keys to multiple values, only if none of the keys exist
'MULTI', // Mark the start of a transaction block
'OBJECT', // subcommand [arguments [arguments ...]] Inspect the internals of Redis objects
'PERSIST', // key Remove the expiration from a key
'PEXPIRE', // key milliseconds Set a key's time to live in milliseconds
'PEXPIREAT', // key milliseconds-timestamp Set the expiration for a key as a UNIX timestamp specified in milliseconds
'PING', // Ping the server
'PSETEX', // key milliseconds value Set the value and expiration in milliseconds of a key
'PSUBSCRIBE', // pattern [pattern ...] Listen for messages published to channels matching the given patterns
'PTTL', // key Get the time to live for a key in milliseconds
'PUBLISH', // channel message Post a message to a channel
'PUNSUBSCRIBE', // [pattern [pattern ...]] Stop listening for messages posted to channels matching the given patterns
'QUIT', // Close the connection
'RANDOMKEY', // Return a random key from the keyspace
'RENAME', // key newkey Rename a key
'RENAMENX', // key newkey Rename a key, only if the new key does not exist
'RESTORE', // key ttl serialized-value Create a key using the provided serialized value, previously obtained using DUMP.
'RPOP', // key Remove and get the last element in a list
'RPOPLPUSH', // source destination Remove the last element in a list, append it to another list and return it
'RPUSH', // key value [value ...] Append one or multiple values to a list
'RPUSHX', // key value Append a value to a list, only if the list exists
'SADD', // key member [member ...] Add one or more members to a set
'SAVE', // Synchronously save the dataset to disk
'SCARD', // key Get the number of members in a set
'SCRIPT EXISTS', // script [script ...] Check existence of scripts in the script cache.
'SCRIPT FLUSH', // Remove all the scripts from the script cache.
'SCRIPT KILL', // Kill the script currently in execution.
'SCRIPT LOAD', // script Load the specified Lua script into the script cache.
'SDIFF', // key [key ...] Subtract multiple sets
'SDIFFSTORE', // destination key [key ...] Subtract multiple sets and store the resulting set in a key
'SELECT', // index Change the selected database for the current connection
'SET', // key value Set the string value of a key
'SETBIT', // key offset value Sets or clears the bit at offset in the string value stored at key
'SETEX', // key seconds value Set the value and expiration of a key
'SETNX', // key value Set the value of a key, only if the key does not exist
'SETRANGE', // key offset value Overwrite part of a string at key starting at the specified offset
'SHUTDOWN', // [NOSAVE] [SAVE] Synchronously save the dataset to disk and then shut down the server
'SINTER', // key [key ...] Intersect multiple sets
'SINTERSTORE', // destination key [key ...] Intersect multiple sets and store the resulting set in a key
'SISMEMBER', // key member Determine if a given value is a member of a set
'SLAVEOF', // host port Make the server a slave of another instance, or promote it as master
'SLOWLOG', // subcommand [argument] Manages the Redis slow queries log
'SMEMBERS', // key Get all the members in a set
'SMOVE', // source destination member Move a member from one set to another
'SORT', // key [BY pattern] [LIMIT offset count] [GET pattern [GET pattern ...]] [ASC|DESC] [ALPHA] [STORE destination] Sort the elements in a list, set or sorted set
'SPOP', // key Remove and return a random member from a set
'SRANDMEMBER', // key [count] Get one or multiple random members from a set
'SREM', // key member [member ...] Remove one or more members from a set
'STRLEN', // key Get the length of the value stored in a key
'SUBSCRIBE', // channel [channel ...] Listen for messages published to the given channels
'SUNION', // key [key ...] Add multiple sets
'SUNIONSTORE', // destination key [key ...] Add multiple sets and store the resulting set in a key
'SYNC', // Internal command used for replication
'TIME', // Return the current server time
'TTL', // key Get the time to live for a key
'TYPE', // key Determine the type stored at key
'UNSUBSCRIBE', // [channel [channel ...]] Stop listening for messages posted to the given channels
'UNWATCH', // Forget about all watched keys
'WATCH', // key [key ...] Watch the given keys to determine execution of the MULTI/EXEC block
'ZADD', // key score member [score member ...] Add one or more members to a sorted set, or update its score if it already exists
'ZCARD', // key Get the number of members in a sorted set
'ZCOUNT', // key min max Count the members in a sorted set with scores within the given values
'ZINCRBY', // key increment member Increment the score of a member in a sorted set
'ZINTERSTORE', // destination numkeys key [key ...] [WEIGHTS weight [weight ...]] [AGGREGATE SUM|MIN|MAX] Intersect multiple sorted sets and store the resulting sorted set in a new key
'ZRANGE', // key start stop [WITHSCORES] Return a range of members in a sorted set, by index
'ZRANGEBYSCORE', // key min max [WITHSCORES] [LIMIT offset count] Return a range of members in a sorted set, by score
'ZRANK', // key member Determine the index of a member in a sorted set
'ZREM', // key member [member ...] Remove one or more members from a sorted set
'ZREMRANGEBYRANK', // key start stop Remove all members in a sorted set within the given indexes
'ZREMRANGEBYSCORE', // key min max Remove all members in a sorted set within the given scores
'ZREVRANGE', // key start stop [WITHSCORES] Return a range of members in a sorted set, by index, with scores ordered from high to low
'ZREVRANGEBYSCORE', // key max min [WITHSCORES] [LIMIT offset count] Return a range of members in a sorted set, by score, with scores ordered from high to low
'ZREVRANK', // key member Determine the index of a member in a sorted set, with scores ordered from high to low
'ZSCORE', // key member Get the score associated with the given member in a sorted set
'ZUNIONSTORE', // destination numkeys key [key ...] [WEIGHTS weight [weight ...]] [AGGREGATE SUM|MIN|MAX] Add multiple sorted sets and store the resulting sorted set in a new key
);
/**
* @var Transaction the currently active transaction
*/
private $_transaction;
/**
* @var resource redis socket connection
*/
private $_socket;
/**
* Closes the connection when this component is being serialized.
* @return array
*/
public function __sleep()
{
$this->close();
return array_keys(get_object_vars($this));
}
/**
* Returns a value indicating whether the DB connection is established.
* @return boolean whether the DB connection is established
*/
public function getIsActive()
{
return $this->_socket !== null;
}
/**
* Establishes a DB connection.
* It does nothing if a DB connection has already been established.
* @throws Exception if connection fails
*/
public function open()
{
if ($this->_socket === null) {
if (empty($this->dsn)) {
throw new InvalidConfigException('Connection.dsn cannot be empty.');
}
$dsn = explode('/', $this->dsn);
$host = $dsn[2];
if (strpos($host, ':')===false) {
$host .= ':6379';
}
$db = isset($dsn[3]) ? $dsn[3] : 0;
\Yii::trace('Opening DB connection: ' . $this->dsn, __CLASS__);
$this->_socket = @stream_socket_client(
$host,
$errorNumber,
$errorDescription,
$this->connectionTimeout ? $this->connectionTimeout : ini_get("default_socket_timeout")
);
if ($this->_socket) {
if ($this->dataTimeout !== null) {
stream_set_timeout($this->_socket, $timeout=(int)$this->dataTimeout, (int) (($this->dataTimeout - $timeout) * 1000000));
}
if ($this->password !== null) {
$this->executeCommand('AUTH', array($this->password));
}
$this->executeCommand('SELECT', array($db));
$this->initConnection();
} else {
\Yii::error("Failed to open DB connection ({$this->dsn}): " . $errorNumber . ' - ' . $errorDescription, __CLASS__);
$message = YII_DEBUG ? 'Failed to open DB connection: ' . $errorNumber . ' - ' . $errorDescription : 'Failed to open DB connection.';
throw new Exception($message, $errorDescription, (int)$errorNumber);
}
}
}
/**
* Closes the currently active DB connection.
* It does nothing if the connection is already closed.
*/
public function close()
{
if ($this->_socket !== null) {
\Yii::trace('Closing DB connection: ' . $this->dsn, __CLASS__);
$this->executeCommand('QUIT');
stream_socket_shutdown($this->_socket, STREAM_SHUT_RDWR);
$this->_socket = null;
$this->_transaction = null;
}
}
/**
* Initializes the DB connection.
* This method is invoked right after the DB connection is established.
* The default implementation triggers an [[EVENT_AFTER_OPEN]] event.
*/
protected function initConnection()
{
$this->trigger(self::EVENT_AFTER_OPEN);
}
/**
* Returns the currently active transaction.
* @return Transaction the currently active transaction. Null if no active transaction.
*/
public function getTransaction()
{
return $this->_transaction & & $this->_transaction->isActive ? $this->_transaction : null;
}
/**
* Starts a transaction.
* @return Transaction the transaction initiated
*/
public function beginTransaction()
{
$this->open();
$this->_transaction = new Transaction(array(
'db' => $this,
));
$this->_transaction->begin();
return $this->_transaction;
}
/**
* Returns the name of the DB driver for the current [[dsn]].
* @return string name of the DB driver
*/
public function getDriverName()
{
if (($pos = strpos($this->dsn, ':')) !== false) {
return strtolower(substr($this->dsn, 0, $pos));
} else {
return 'redis';
}
}
/**
*
* @param string $name
* @param array $params
* @return mixed
*/
public function __call($name, $params)
{
$redisCommand = strtoupper(Inflector::camel2words($name, false));
if (in_array($redisCommand, $this->redisCommands)) {
return $this->executeCommand($name, $params);
} else {
return parent::__call($name, $params);
}
}
/**
* Executes a redis command.
* For a list of available commands and their parameters see http://redis.io/commands.
*
* @param string $name the name of the command
* @param array $params list of parameters for the command
* @return array|bool|null|string Dependend on the executed command this method
* will return different data types:
*
* - `true` for commands that return "status reply".
* - `string` for commands that return "integer reply"
* as the value is in the range of a signed 64 bit integer.
* - `string` or `null` for commands that return "bulk reply".
* - `array` for commands that return "Multi-bulk replies".
*
* See [redis protocol description](http://redis.io/topics/protocol)
* for details on the mentioned reply types.
* @trows Exception for commands that return [error reply](http://redis.io/topics/protocol#error-reply).
*/
public function executeCommand($name, $params=array())
{
$this->open();
array_unshift($params, $name);
$command = '*' . count($params) . "\r\n";
foreach($params as $arg) {
$command .= '$' . mb_strlen($arg, '8bit') . "\r\n" . $arg . "\r\n";
}
\Yii::trace("Executing Redis Command: {$name}", __CLASS__);
fwrite($this->_socket, $command);
return $this->parseResponse(implode(' ', $params));
}
private function parseResponse($command)
{
if(($line = fgets($this->_socket)) === false) {
throw new Exception("Failed to read from socket.\nRedis command was: " . $command);
}
$type = $line[0];
$line = mb_substr($line, 1, -2, '8bit');
switch($type)
{
case '+': // Status reply
return true;
case '-': // Error reply
throw new Exception("Redis error: " . $line . "\nRedis command was: " . $command);
case ':': // Integer reply
// no cast to int as it is in the range of a signed 64 bit integer
return $line;
case '$': // Bulk replies
if ($line == '-1') {
return null;
}
$length = $line + 2;
$data = '';
while ($length > 0) {
if(($block = fread($this->_socket, $line + 2)) === false) {
throw new Exception("Failed to read from socket.\nRedis command was: " . $command);
}
$data .= $block;
$length -= mb_strlen($block, '8bit');
}
return mb_substr($data, 0, -2, '8bit');
case '*': // Multi-bulk replies
$count = (int) $line;
$data = array();
for($i = 0; $i < $count; $i++) {
$data[] = $this->parseResponse($command);
}
return $data;
default:
throw new Exception('Received illegal data from redis: ' . $line . "\nRedis command was: " . $command);
}
}
}
