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<?php
namespace React\Socket;
use React\Stream\DuplexStreamInterface;
/**
* Any incoming and outgoing connection is represented by this interface,
* such as a normal TCP/IP connection.
*
* An incoming or outgoing connection is a duplex stream (both readable and
* writable) that implements React's
* [`DuplexStreamInterface`](https://github.com/reactphp/stream#duplexstreaminterface).
* It contains additional properties for the local and remote address (client IP)
* where this connection has been established to/from.
*
* Most commonly, instances implementing this `ConnectionInterface` are emitted
* by all classes implementing the [`ServerInterface`](#serverinterface) and
* used by all classes implementing the [`ConnectorInterface`](#connectorinterface).
*
* Because the `ConnectionInterface` implements the underlying
* [`DuplexStreamInterface`](https://github.com/reactphp/stream#duplexstreaminterface)
* you can use any of its events and methods as usual:
*
* ```php
* $connection->on('data', function ($chunk) {
* echo $chunk;
* });
*
* $connection->on('end', function () {
* echo 'ended';
* });
*
* $connection->on('error', function (Exception $e) {
* echo 'error: ' . $e->getMessage();
* });
*
* $connection->on('close', function () {
* echo 'closed';
* });
*
* $connection->write($data);
* $connection->end($data = null);
* $connection->close();
* // …
* ```
*
* For more details, see the
* [`DuplexStreamInterface`](https://github.com/reactphp/stream#duplexstreaminterface).
*
* @see DuplexStreamInterface
* @see ServerInterface
* @see ConnectorInterface
*/
interface ConnectionInterface extends DuplexStreamInterface
{
/**
* Returns the full remote address (URI) where this connection has been established with
*
* ```php
* $address = $connection->getRemoteAddress();
* echo 'Connection with ' . $address . PHP_EOL;
* ```
*
* If the remote address can not be determined or is unknown at this time (such as
* after the connection has been closed), it MAY return a `NULL` value instead.
*
* Otherwise, it will return the full address (URI) as a string value, such
* as `tcp://127.0.0.1:8080`, `tcp://[::1]:80`, `tls://127.0.0.1:443`,
* `unix://example.sock` or `unix:///path/to/example.sock`.
* Note that individual URI components are application specific and depend
* on the underlying transport protocol.
*
* If this is a TCP/IP based connection and you only want the remote IP, you may
* use something like this:
*
* ```php
* $address = $connection->getRemoteAddress();
* $ip = trim(parse_url($address, PHP_URL_HOST), '[]');
* echo 'Connection with ' . $ip . PHP_EOL;
* ```
*
* @return ?string remote address (URI) or null if unknown
*/
public function getRemoteAddress();
/**
* Returns the full local address (full URI with scheme, IP and port) where this connection has been established with
*
* ```php
* $address = $connection->getLocalAddress();
* echo 'Connection with ' . $address . PHP_EOL;
* ```
*
* If the local address can not be determined or is unknown at this time (such as
* after the connection has been closed), it MAY return a `NULL` value instead.
*
* Otherwise, it will return the full address (URI) as a string value, such
* as `tcp://127.0.0.1:8080`, `tcp://[::1]:80`, `tls://127.0.0.1:443`,
* `unix://example.sock` or `unix:///path/to/example.sock`.
* Note that individual URI components are application specific and depend
* on the underlying transport protocol.
*
* This method complements the [`getRemoteAddress()`](#getremoteaddress) method,
* so they should not be confused.
*
* If your `TcpServer` instance is listening on multiple interfaces (e.g. using
* the address `0.0.0.0`), you can use this method to find out which interface
* actually accepted this connection (such as a public or local interface).
*
* If your system has multiple interfaces (e.g. a WAN and a LAN interface),
* you can use this method to find out which interface was actually
* used for this connection.
*
* @return ?string local address (URI) or null if unknown
* @see self::getRemoteAddress()
*/
public function getLocalAddress();
}