Add api for sending ping and receiving pong on WebSocket

Author: Zbigniew Szymański

AndroidAsync/src/com/koushikdutta/async/http/HybiParser.java

@@ -302,6 +302,10 @@ public byte[] frame(byte[] data, int offset, int length) {
     	return frame(OP_BINARY, data, -1, offset, length);
     }
 
+    public byte[] pingFrame(String data) {
+        return frame(OP_PING, data, -1);
+    }
+
     /**
      * Flip the opcode so to avoid the name collision with the public method
      * 
@@ -378,10 +382,6 @@ private byte[] frame(int opcode, byte [] data, int errorCode, int dataOffset, in
         return frame;
     }
 
-    public void ping(String message) {
-//        send(frame(message, OP_PING, -1));
-    }
-
     public void close(int code, String reason) {
         if (mClosed) return;
         sendFrame(frame(OP_CLOSE, reason, code));
@@ -444,13 +444,14 @@ private void emitFrame() throws IOException {
 
         } else if (opcode == OP_PONG) {
             String message = encode(payload);
-            // FIXME: Fire callback...
+            onPong(message);
 //            Log.d(TAG, "Got pong! " + message);
         }
     }
 
     protected abstract void onMessage(byte[] payload);
     protected abstract void onMessage(String payload);
+    protected abstract void onPong(String payload);
     protected abstract void onDisconnect(int code, String reason);
     protected abstract void report(Exception ex);
 

AndroidAsync/src/com/koushikdutta/async/http/WebSocket.java

@@ -7,14 +7,21 @@ public interface WebSocket extends AsyncSocket {
     static public interface StringCallback {
         public void onStringAvailable(String s);
     }
+    static public interface PongCallback {
+        public void onPongReceived(String s);
+    }
 
     public void send(byte[] bytes);
     public void send(String string);
     public void send(byte [] bytes, int offset, int len);
+    public void ping(String message);
 
     public void setStringCallback(StringCallback callback);
     public StringCallback getStringCallback();
-    
+
+    public void setPongCallback(PongCallback callback);
+    public PongCallback getPongCallback();
+
     public boolean isBuffering();
 
     public AsyncSocket getSocket();

AndroidAsync/src/com/koushikdutta/async/http/WebSocketImpl.java

@@ -98,6 +98,12 @@ protected void onDisconnect(int code, String reason) {
             protected void sendFrame(byte[] frame) {
                 mSink.write(ByteBuffer.wrap(frame));
             }
+
+            @Override
+            protected void onPong(String payload) {
+                if (WebSocketImpl.this.mPongCallback != null)
+                    WebSocketImpl.this.mPongCallback.onPongReceived(payload);
+            }
         };
         mParser.setMasking(masking);
         mParser.setDeflate(deflate);
@@ -228,6 +234,11 @@ public void send(String string) {
         mSink.write(ByteBuffer.wrap(mParser.frame(string)));
     }
 
+    @Override
+    public void ping(String string) {
+        mSink.write(ByteBuffer.wrap(mParser.pingFrame(string)));
+    }
+
     private StringCallback mStringCallback;
     @Override
     public void setStringCallback(StringCallback callback) {
@@ -245,6 +256,17 @@ public StringCallback getStringCallback() {
         return mStringCallback;
     }
 
+    private PongCallback mPongCallback;
+    @Override
+    public void setPongCallback(PongCallback callback) {
+        mPongCallback = callback;
+    }
+
+    @Override
+    public PongCallback getPongCallback() {
+        return mPongCallback;
+    }
+
     @Override
     public DataCallback getDataCallback() {
         return mDataCallback;