Fixed issue with connection being stuck on awaitUninterruptibly() as per fizzed#1

Fixed blocking issue at channel write.
Related issue RestComm/smpp-extensions#28

Author: olenara

src/main/java/com/cloudhopper/smpp/impl/DefaultSmppClient.java

@@ -297,19 +297,23 @@ protected Channel createConnectedChannel(String host, int port, long connectTime
         // a socket address used to "bind" to the remote system
         InetSocketAddress socketAddr = new InetSocketAddress(host, port);
 
-	// set the timeout
-	this.clientBootstrap.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, (int)connectTimeoutMillis);
+        // set the timeout
+        this.clientBootstrap.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, (int)connectTimeoutMillis);
 
         // attempt to connect to the remote system
         ChannelFuture connectFuture = this.clientBootstrap.connect(socketAddr);
 
-        // wait until the connection is made successfully
-        // boolean timeout = !connectFuture.await(connectTimeoutMillis);
-        // BAD: using .await(timeout)
-        //      see http://netty.io/3.9/api/org/jboss/netty/channel/ChannelFuture.html
+        /* It turns out that under certain unknown circumstances the connect waits forever: https://github.com/twitter/cloudhopper-smpp/issues/117
+         * That's why the future is canceled 1 second after the specified timeout.
+         * This is a workaround and hopefully not needed after the switch to netty 4.
+         */
         logger.debug("Waiting for client connection to {}", socketAddr);
-        connectFuture.awaitUninterruptibly();
-        //assert connectFuture.isDone();
+        if (!connectFuture.await(connectTimeoutMillis + 1000)) {
+            logger.error("connectFuture did not finish in expected time! Try to cancel the connectFuture");
+            boolean isCanceled = connectFuture.cancel();
+            logger.error("connectFuture: isCanceled {} isDone {} isSuccess {}", isCanceled, connectFuture.isDone(), connectFuture.isSuccess());
+            throw new SmppChannelConnectTimeoutException("Could not connect to the server within timeout");
+        }
 
         if (connectFuture.isCancelled()) {
             logger.warn("Client connection cancelled.");

src/main/java/com/cloudhopper/smpp/impl/DefaultSmppSession.java

@@ -510,16 +510,18 @@ public WindowFuture<Integer,PduRequest,PduResponse> sendRequestPdu(PduRequest pd
         // write the pdu out & wait timeout amount of time
         ChannelFuture channelFuture = this.channel.writeAndFlush(buffer);
         if (configuration.getWriteTimeout() > 0){
-            channelFuture.await(configuration.getWriteTimeout());
+            if(!channelFuture.await(configuration.getWriteTimeout()))
+            	throw new SmppChannelException(channelFuture.cause() != null ? channelFuture.cause().getMessage()
+            	        : "ChannelFuture failed without cause.", channelFuture.cause());
         } else {
             channelFuture.await();
         }
 
         // check if the write was a success
         if (!channelFuture.isSuccess()) {
             // the write failed, make sure to throw an exception
-	    if (channelFuture.cause() != null) throw new SmppChannelException(channelFuture.cause().getMessage(), channelFuture.cause());
-	    else throw new SmppChannelException("ChannelFuture failed without cause.");
+            throw new SmppChannelException(channelFuture.cause() != null ? channelFuture.getCause().getMessage()
+                    : "ChannelFuture failed without cause.", channelFuture.cause());
         }
 
         this.countSendRequestPdu(pdu);
@@ -562,15 +564,18 @@ public void sendResponsePdu(PduResponse pdu) throws RecoverablePduException, Unr
         // write the pdu out & wait timeout amount of time
         ChannelFuture channelFuture = this.channel.writeAndFlush(buffer);
         if(configuration.getWriteTimeout() > 0){
-            channelFuture.await(configuration.getWriteTimeout());
+            if(!channelFuture.await(configuration.getWriteTimeout()))
+                throw new SmppChannelException(channelFuture.cause() != null ? channelFuture.cause().getMessage()
+                        : "ChannelFuture failed without cause.", channelFuture.cause());
         } else {
             channelFuture.await();
         }
 
         // check if the write was a success
         if (!channelFuture.isSuccess()) {
             // the write failed, make sure to throw an exception
-            throw new SmppChannelException(channelFuture.cause().getMessage(), channelFuture.cause());
+            throw new SmppChannelException(channelFuture.cause() != null ? channelFuture.cause().getMessage()
+                    : "ChannelFuture failed without cause.", channelFuture.cause());
         }
     }