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Improve handling of -MOVED and -ASK responses.

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This change improves code reusing and simplifies the internals of
our redis-cluster connection backend.
This commit is contained in:
Daniele Alessandri
2013-12-21 11:54:15 +01:00
parent b45f87caf2
commit 317fa42891
1 changed files with 62 additions and 47 deletions
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lib/Predis/Connection/RedisCluster.php
+62 -47
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@@ -21,7 +21,6 @@ use Predis\Cluster\CommandHashStrategyInterface;
use Predis\Cluster\RedisClusterHashStrategy;
use Predis\Command\CommandInterface;
use Predis\Command\RawCommand;
use Predis\Protocol\ProtocolException;
/**
* Abstraction for a Redis-backed cluster of nodes (Redis >= 3.0.0).
@@ -258,6 +257,26 @@ class RedisCluster implements ClusterConnectionInterface, IteratorAggregate, Cou
return $nodes[$index];
}
/**
* Creates a new connection instance from the given connection ID.
*
* @param string $connectionID Identifier for the connection.
* @return SingleConnectionInterface
*/
protected function createConnection($connectionID)
{
$host = explode(':', $connectionID, 2);
$parameters = array_merge($this->defaultParameters, array(
'host' => $host[0],
'port' => $host[1],
));
$connection = $this->connections->create($parameters);
return $connection;
}
/**
* {@inheritdoc}
*/
@@ -299,13 +318,7 @@ class RedisCluster implements ClusterConnectionInterface, IteratorAggregate, Cou
$connectionID = $this->guessNode($slot);
if (!$connection = $this->getConnectionById($connectionID)) {
$host = explode(':', $connectionID, 2);
$parameters = array_merge($this->defaultParameters, array(
'host' => $host[0],
'port' => $host[1],
));
$connection = $this->connections->create($parameters);
$connection = $this->createConnection($connectionID);
$this->pool[$connectionID] = $connection;
}
@@ -348,7 +361,7 @@ class RedisCluster implements ClusterConnectionInterface, IteratorAggregate, Cou
}
/**
* Handles -ERR responses from Redis.
* Handles -ERR responses returned by Redis.
*
* @param CommandInterface $command Command that generated the -ERR response.
* @param ResponseErrorInterface $error Redis error response object.
@@ -360,8 +373,10 @@ class RedisCluster implements ClusterConnectionInterface, IteratorAggregate, Cou
switch ($details[0]) {
case 'MOVED':
return $this->onMovedResponse($command, $details[1]);
case 'ASK':
return $this->onMoveRequest($command, $details[0], $details[1]);
return $this->onAskResponse($command, $details[1]);
default:
return $error;
@@ -369,51 +384,51 @@ class RedisCluster implements ClusterConnectionInterface, IteratorAggregate, Cou
}
/**
* Handles -MOVED and -ASK responses by re-executing the command on the node
* specified by the Redis response.
* Handles -MOVED responses by executing again the command against the node
* indicated by the Redis response.
*
* @param CommandInterface $command Command that generated the -MOVE or -ASK response.
* @param string $request Type of request (either 'MOVED' or 'ASK').
* @param string $details Parameters of the MOVED/ASK request.
* @param CommandInterface $command Command that generated the -MOVED response.
* @param string $details Parameters of the -MOVED response.
* @return mixed
*/
protected function onMoveRequest(CommandInterface $command, $request, $details)
protected function onMovedResponse(CommandInterface $command, $details)
{
list($slot, $host) = explode(' ', $details, 2);
$connection = $this->getConnectionById($host);
list($slot, $connectionID) = explode(' ', $details, 2);
if (!$connection) {
$host = explode(':', $host, 2);
$parameters = array_merge($this->defaultParameters, array(
'host' => $host[0],
'port' => $host[1],
));
$connection = $this->connections->create($parameters);
if (!$connection = $this->getConnectionById($connectionID)) {
$connection = $this->createConnection($connectionID);
}
switch ($request) {
case 'MOVED':
if ($this->askClusterNodes) {
$this->askClusterNodes();
}
$this->move($connection, $slot);
$response = $this->executeCommand($command);
return $response;
case 'ASK':
$connection->executeCommand(RawCommand::create('ASKING'));
$response = $connection->executeCommand($command);
return $response;
default:
throw new ProtocolException(
"Unexpected request type for a move request: $request"
);
if ($this->askClusterNodes) {
$this->askClusterNodes();
}
$this->move($connection, $slot);
$response = $this->executeCommand($command);
return $response;
}
/**
* Handles -ASK responses by executing again the command against the node
* indicated by the Redis response.
*
* @param CommandInterface $command Command that generated the -ASK response.
* @param string $details Parameters of the -ASK response.
* @return mixed
*/
protected function onAskResponse(CommandInterface $command, $details)
{
list($slot, $connectionID) = explode(' ', $details, 2);
if (!$connection = $this->getConnectionById($connectionID)) {
$connection = $this->createConnection($connectionID);
}
$connection->executeCommand(RawCommand::create('ASKING'));
$response = $connection->executeCommand($command);
return $response;
}
/**