This project provides extra (in terms of "additional", "extraordinary", "special" and "unusual") decorators, built on top of ReactPHP's Socket.
Table of Contents
If you're not already familar with react/socket,
think of it as an async (non-blocking) version of fsockopen()
or stream_socket_client().
I.e. before you can send and receive data to/from a remote server, you first have to establish a connection - which
takes its time because it involves several steps.
In order to be able to establish several connections at the same time, react/socket provides a simple
API to establish simple connections in an async (non-blocking) way.
This project includes several classes that extend this base functionality by implementing the same simple ConnectorInterface.
This interface provides a single promise-based method connect($uri) which can be used to easily notify
when the connection is successfully established or the Connector gives up and the connection fails.
$connector->connect('www.google.com:80')->then(function ($stream) {
echo 'connection successfully established';
$stream->write("GET / HTTP/1.0\r\nHost: www.google.com\r\n\r\n");
$stream->end();
}, function ($exception) {
echo 'connection attempt failed: ' . $exception->getMessage();
});Because everything uses the same simple API, the resulting Connector classes can be easily interchanged
and be used in places that expect the normal ConnectorInterface. This can be used to stack them into each other,
like using timeouts for TCP connections, delaying SSL/TLS connections,
retrying failed connection attemps, randomly picking a Connector or
any combination thereof.
This section lists all this libraries' features along with some examples.
The examples assume you've installed this library and
already set up a Socket/Connector instance $connector.
All classes are located in the ConnectionManager\Extra namespace.
The ConnectionManagerRepeat($connector, $tries) tries connecting to the given location up to a maximum
of $tries times when the connection fails.
If you pass a value of 3 to it, it will first issue a normal connection attempt
and then retry up to 2 times if the connection attempt fails:
$connectorRepeater = new ConnectionManagerRepeat($connector, 3);
$connectorRepeater->connect('www.google.com:80')->then(function ($stream) {
echo 'connection successfully established';
$stream->close();
});The ConnectionManagerTimeout($connector, $timeout, $loop) sets a maximum $timeout in seconds on when to give up
waiting for the connection to complete.
$connector = new ConnectionManagerTimeout($connector, 3.0, $loop);The ConnectionManagerDelay($connector, $delay, $loop) sets a fixed initial $delay in seconds before actually
trying to connect. (Not to be confused with ConnectionManagerTimeout which sets a maximum timeout.)
$delayed = new ConnectionManagerDelayed($connector, 0.5, $loop);The ConnectionManagerReject() simply rejects every single connection attempt.
This is particularly useful for the below ConnectionManagerSelective to reject connection attempts
to only certain destinations (for example blocking advertisements or harmful sites).
The ConnectionManagerSwappable($connector) is a simple decorator for other ConnectionManagers to
simplify exchanging the actual ConnectionManager during runtime (->setConnectionManager($connector)).
The ConnectionManagerConsecutive($connectors) establishs connections by trying to connect through
any of the given ConnectionManagers in consecutive order until the first one succeeds.
$consecutive = new ConnectionManagerConsecutive(array(
$connector1,
$connector2
));The ConnectionManagerRandom($connectors) works much like ConnectionManagerConsecutive but instead
of using a fixed order, it always uses a randomly shuffled order.
$random = new ConnectionManagerRandom(array(
$connector1,
$connector2
));The ConnectionManagerConcurrent($connectors) establishes connections by trying to connect through
ALL of the given ConnectionManagers at once, until the first one succeeds.
$concurrent = new ConnectionManagerConcurrent(array(
$connector1,
$connector2
));The ConnectionManagerSelective($connectors) manages a list of Connectors and
forwards each connection through the first matching one.
This can be used to implement networking access control lists (ACLs) or firewill
rules like a blacklist or whitelist.
This allows fine-grained control on how to handle outgoing connections, like rejecting advertisements, delaying unencrypted HTTP requests or forwarding HTTPS connection through a foreign country.
If none of the entries in the list matches, the connection will be rejected. This can be used to implement a very simple whitelist like this:
$selective = new ConnectionManagerSelective(array(
'github.com' => $connector,
'*:443' => $connector
));If you want to implement a blacklist (i.e. reject only certain targets), make sure to add a default target to the end of the list like this:
$reject = new ConnectionManagerReject();
$selective = new ConnectionManagerSelective(array(
'ads.example.com' => $reject,
'*:80-81' => $reject,
'*' => $connector
));Similarly, you can also combine any of the other connectors to implement more advanced connection setups, such as delaying unencrypted connections only and retrying unreliable hosts:
// delay connection by 2 seconds
$delayed = new ConnectionManagerDelay($connector, 2.0, $loop);
// maximum of 3 tries, each taking no longer than 2.0 seconds
$retry = new ConnectionManagerRepeat(
new ConnectionManagerTimeout($connector, 2.0, $loop),
3
);
$selective = new ConnectionManagerSelective(array(
'*:80' => $delayed,
'unreliable.example.com' => $retry,
'*' => $connector
));The recommended way to install this library is through Composer. New to Composer?
This will install the latest supported version:
$ composer require clue/connection-manager-extra:^0.7.1See also the CHANGELOG for more details about version upgrades.
To run the test suite, you first need to clone this repo and then install all dependencies through Composer:
$ composer installTo run the test suite, go to the project root and run:
$ php vendor/bin/phpunitMIT