When using the phpiredis-based connection backends, failed pipelines led
to spurious responses returned after reconnecting to Redis because the
underlying reader was not properly reset by discarding buffered replies
after disconnecting.
Fixes a couple of issues reported in #363.
Common failures are the use of SELECT with a database index outside
the bound of the configured number of databases in redis.conf or the
use of a wrong password for authentication with AUTH.
This resolves#322.
This is handy for accessing remote Redis instances over a secure SSL connection
which is currently a popular option or even requirement with many cloud hosting
environments.
In order to configure the client to use an SSL-encrypted connection the scheme
in the connection parameters must be either "tsl" or "rediss" and a set of SSL
options (see http://php.net/manual/en/context.ssl.php) must be provided via the
"ssl" parameter as a named array.
The following example (which does not necessarily represent an example of good
practices!) illustrates how to set the "ssl" parameter using a named array and
the equivalent URI string:
// Parameters as named array
$parameters = [
'scheme' => 'tls',
'host' => '127.0.0.1',
'ssl' => [
'cafile' => '/home/adaniele/redis.pem',
'verify_peer_name' => false,
],
];
// Parameters as URI string
$parameters = 'tls://127.0.0.1?ssl[cafile]=redis.pem&ssl[verify_peer_name]=1';
Support for SSL is currently limited to the Predis\Connection\StreamConnection
backend but we intend to investigate if it is possible to extend this feature
to Predis\Connection\PhpiredisStreamConnection in the future.
Be aware that using encrypted connections may lead to a performance degradation
especially in the connect() operation due to the overhead of the TLS handshake.
Unfortunately there is no real way to reuse SSL sessions from userland, aside
from enabling persistent connections, but this will work only on PHP >= 7.0.0
because previous versions of PHP do not provide enough info about a stream from
get_stream_meta_data().
NOTE: Redis does not have built-in support for SSL-encrypted connections, but if
you want to expose it to public networks you may want to rely on "stunnel".
stream_socket_client() has the undocumented ability to open different persistent
streams by providing a path in the $address string. Previously we supported this
behaviour with a combination of "persistent" and "path" (see #139) but this can
be confusing, especially now that we support the redis:// scheme which uses the
path part of an URI string to specify a database number.
After this change, instead of using an URI string such as:
$parameters = 'tcp://127.0.0.1/first?persistent=1&database=5';
You should use the following ones:
$parameters = 'tcp://127.0.0.1?persistent=first&database=5';
$parameters = 'redis://127.0.0.1/5?persistent=first';
Avoiding "path" makes even more sense when using array connection parameters:
$parameters = [
'host' => '127.0.0.1',
'database' => 5,
'persistent' => 'first',
]
This feature is not supported when using UNIX domain sockets because the path
trick of stream_socket_client() does not play well with the actual path of the
socket file. The client will throw an InvalidArgumentException exception to
notify the user.
NOTE: unfortunately we have to disable the tests for persistent connections when
running under HHVM due to a bug in their implementation of get_resource_type()
preventing us to recognize a persistent stream from userland code.
Status response objects are needed mostly to make it possible from the
client perspective to differentiate a status response with the payload
"OK" from a normale bulk reply containing "OK".
The biggest change is for commands returning +OK responses: these were
previously translated to TRUE (bool value), but they are now returned
as instances of Predis\Response\Status. Just to illustrate an example
of the possibilities with this change we will use SET since it is the
most widely used command returning +OK:
$response = $client->set('foo', 'bar');
echo $response; // 'OK'
$response == 'OK'; // TRUE
isset($response->ok); // TRUE
$response == true; // TRUE
$response === true; // FALSE
$response instanceof Predis\Response\ObjectInterface; // TRUE
$response instanceof Predis\Response\Status; // TRUE
For those checking responses returned by commands such as SET or PONG,
the breaking change basically lies in the usage of strict comparison:
doing $response === true will now evaluate to FALSE instead of TRUE.
By default Predis caches common status responses such as OK or QUEUED
to lower the memory usage when using pipelines or transactions.
We now have a base test case class for Predis (namely PredisTestCase)
grouping various commonly used utility methods shared by all of the
tests in the suite, greatly improving reusability.
This cannot be implemented for previous versions of PHP because we
need socket_import_stream() to extract the underlying socket resource
from the stream in order to be able to set the TCP_NODELAY flag.
This class works just like Predis\Connection\PhpiredisConnection but
it does not require the socket extensions since it relies on PHP's
native streams thus allowing the use of persistent connections.
Daniele Alessandri