Fix unix:// addresses for Unix domain socket (UDS) paths

README.md

@@ -149,7 +149,8 @@ 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` or `tls://127.0.0.1:443`.
+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.
 
@@ -176,7 +177,8 @@ 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` or `tls://127.0.0.1:443`.
+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.
 
@@ -831,6 +833,12 @@ $connector->connect('unix:///tmp/demo.sock')->then(function (ConnectionInterface
 });
 ```
 
+> The [`getRemoteAddress()`](#getremoteaddress) method will return the target
+  Unix domain socket (UDS) path as given to the `connect()` method, including
+  the `unix://` scheme, for example `unix:///tmp/demo.sock`.
+  The [`getLocalAddress()`](#getlocaladdress) method will most likely return a
+  `null` value as this value is not applicable to UDS connections here.
+
 Under the hood, the `Connector` is implemented as a *higher-level facade*
 for the lower-level connectors implemented in this package. This means it
 also shares all of their features and implementation details.
@@ -1209,6 +1217,12 @@ Connecting to Unix domain sockets is an atomic operation, i.e. its promise will
 settle (either resolve or reject) immediately.
 As such, calling `cancel()` on the resulting promise has no effect.
 
+> The [`getRemoteAddress()`](#getremoteaddress) method will return the target
+  Unix domain socket (UDS) path as given to the `connect()` method, prepended
+  with the `unix://` scheme, for example `unix:///tmp/demo.sock`.
+  The [`getLocalAddress()`](#getlocaladdress) method will most likely return a
+  `null` value as this value is not applicable to UDS connections here.
+
 ## Install
 
 The recommended way to install this library is [through Composer](http://getcomposer.org).

src/Connection.php

@@ -19,6 +19,13 @@
  */
 class Connection extends EventEmitter implements ConnectionInterface
 {
+    /**
+     * Internal flag whether this is a Unix domain socket (UDS) connection
+     *
+     * @internal
+     */
+    public $unix = false;
+
     /**
      * Internal flag whether encryption has been enabled on this connection
      *
@@ -138,6 +145,22 @@ private function parseAddress($address)
             return null;
         }
 
+        if ($this->unix) {
+            // remove trailing colon from address for HHVM < 3.19: https://3v4l.org/5C1lo
+            // note that techncially ":" is a valid address, so keep this in place otherwise
+            if (substr($address, -1) === ':' && defined('HHVM_VERSION_ID') && HHVM_VERSION_ID < 31900) {
+                $address = (string)substr($address, 0, -1);
+            }
+
+            // work around unknown addresses should return null value: https://3v4l.org/5C1lo
+            // PHP uses "\0" string and HHVM uses empty string (colon removed above)
+            if ($address === "\x00" || $address === '') {
+                return null;
+            }
+
+            return 'unix://' . $address;
+        }
+
         // check if this is an IPv6 address which includes multiple colons but no square brackets
         $pos = strrpos($address, ':');
         if ($pos !== false && strpos($address, ':') < $pos && substr($address, 0, 1) !== '[') {

src/ConnectionInterface.php

@@ -66,7 +66,8 @@ interface ConnectionInterface extends DuplexStreamInterface
      * 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` or `tls://127.0.0.1:443`.
+     * 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.
      *
@@ -95,7 +96,8 @@ public function getRemoteAddress();
      * 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` or `tls://127.0.0.1:443`.
+     * 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.
      *

src/UnixConnector.php

@@ -36,6 +36,9 @@ public function connect($path)
             return Promise\reject(new RuntimeException('Unable to connect to unix domain socket "' . $path . '": ' . $errstr, $errno));
         }
 
-        return Promise\resolve(new Connection($resource, $this->loop));
+        $connection = new Connection($resource, $this->loop);
+        $connection->unix = true;
+
+        return Promise\resolve($connection);
     }
 }

tests/UnixConnectorTest.php

@@ -3,6 +3,8 @@
 namespace React\Tests\Socket;
 
 use React\Socket\UnixConnector;
+use Clue\React\Block;
+use React\Socket\ConnectionInterface;
 
 class UnixConnectorTest extends TestCase
 {
@@ -45,8 +47,19 @@ public function testValid()
         $promise = $this->connector->connect($path);
         $promise->then($this->expectCallableOnce());
 
+        // remember remote and local address of this connection and close again
+        $remote = $local = false;
+        $promise->then(function(ConnectionInterface $conn) use (&$remote, &$local) {
+            $remote = $conn->getRemoteAddress();
+            $local = $conn->getLocalAddress();
+            $conn->close();
+        });
+
         // clean up server
         fclose($server);
         unlink($path);
+
+        $this->assertNull($local);
+        $this->assertEquals('unix://' . $path, $remote);
     }
 }