Response after position processed

6 files changed, 168 insertions, 14 deletions

diff --git a/src/main/java/org/traccar/BasePipelineFactory.java b/src/main/java/org/traccar/BasePipelineFactory.java
index b184da45c..70f999c72 100644
--- a/src/main/java/org/traccar/BasePipelineFactory.java
+++ b/src/main/java/org/traccar/BasePipelineFactory.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012 - 2022 Anton Tananaev (anton@traccar.org)
+ * Copyright 2012 - 2023 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,6 +25,7 @@ import io.netty.channel.ChannelPipeline;
 import io.netty.handler.timeout.IdleStateHandler;
 import org.traccar.config.Config;
 import org.traccar.config.Keys;
+import org.traccar.handler.AcknowledgementHandler;
 import org.traccar.handler.ComputedAttributesHandler;
 import org.traccar.handler.CopyAttributesHandler;
 import org.traccar.handler.DefaultDataHandler;
@@ -60,15 +61,19 @@ public abstract class BasePipelineFactory extends ChannelInitializer<Channel> {
     private final Injector injector;
     private final TrackerConnector connector;
     private final String protocol;
-    private int timeout;
+    private final boolean instantAcknowledgement;
+    private final int timeout;
 
     public BasePipelineFactory(TrackerConnector connector, Config config, String protocol) {
         this.injector = Main.getInjector();
         this.connector = connector;
         this.protocol = protocol;
-        timeout = config.getInteger(Keys.PROTOCOL_TIMEOUT.withPrefix(protocol));
+        instantAcknowledgement = config.getBoolean(Keys.SERVER_INSTANT_ACKNOWLEDGEMENT);
+        int timeout = config.getInteger(Keys.PROTOCOL_TIMEOUT.withPrefix(protocol));
         if (timeout == 0) {
-            timeout = config.getInteger(Keys.SERVER_TIMEOUT);
+            this.timeout = config.getInteger(Keys.SERVER_TIMEOUT);
+        } else {
+            this.timeout = timeout;
         }
     }
 
@@ -112,6 +117,9 @@ public abstract class BasePipelineFactory extends ChannelInitializer<Channel> {
         pipeline.addLast(new OpenChannelHandler(connector));
         pipeline.addLast(new NetworkMessageHandler());
         pipeline.addLast(new StandardLoggingHandler(protocol));
+        if (!instantAcknowledgement) {
+            pipeline.addLast(new AcknowledgementHandler());
+        }
 
         addProtocolHandlers(handler -> {
             if (handler instanceof BaseProtocolDecoder || handler instanceof BaseProtocolEncoder) {
diff --git a/src/main/java/org/traccar/ExtendedObjectDecoder.java b/src/main/java/org/traccar/ExtendedObjectDecoder.java
index f79a36c85..805f98cb7 100644
--- a/src/main/java/org/traccar/ExtendedObjectDecoder.java
+++ b/src/main/java/org/traccar/ExtendedObjectDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 - 2020 Anton Tananaev (anton@traccar.org)
+ * Copyright 2015 - 2023 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@ import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.util.ReferenceCountUtil;
 import org.traccar.config.Config;
 import org.traccar.config.Keys;
+import org.traccar.handler.AcknowledgementHandler;
 import org.traccar.helper.DataConverter;
 import org.traccar.model.Position;
 
@@ -30,6 +31,7 @@ import javax.inject.Inject;
 import java.net.SocketAddress;
 import java.nio.charset.StandardCharsets;
 import java.util.Collection;
+import java.util.List;
 
 public abstract class ExtendedObjectDecoder extends ChannelInboundHandlerAdapter {
 
@@ -68,6 +70,7 @@ public abstract class ExtendedObjectDecoder extends ChannelInboundHandlerAdapter
     public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
         NetworkMessage networkMessage = (NetworkMessage) msg;
         Object originalMessage = networkMessage.getMessage();
+        ctx.writeAndFlush(new AcknowledgementHandler.EventReceived());
         try {
             Object decodedMessage = decode(ctx.channel(), networkMessage.getRemoteAddress(), originalMessage);
             onMessageEvent(ctx.channel(), networkMessage.getRemoteAddress(), originalMessage, decodedMessage);
@@ -76,14 +79,19 @@ public abstract class ExtendedObjectDecoder extends ChannelInboundHandlerAdapter
             }
             if (decodedMessage != null) {
                 if (decodedMessage instanceof Collection) {
-                    for (Object o : (Collection) decodedMessage) {
+                    var collection = (Collection) decodedMessage;
+                    ctx.writeAndFlush(new AcknowledgementHandler.EventDecoded(collection));
+                    for (Object o : collection) {
                         saveOriginal(o, originalMessage);
                         ctx.fireChannelRead(o);
                     }
                 } else {
+                    ctx.writeAndFlush(new AcknowledgementHandler.EventDecoded(List.of(decodedMessage)));
                     saveOriginal(decodedMessage, originalMessage);
                     ctx.fireChannelRead(decodedMessage);
                 }
+            } else {
+                ctx.writeAndFlush(new AcknowledgementHandler.EventDecoded(List.of()));
             }
         } finally {
             ReferenceCountUtil.release(originalMessage);
diff --git a/src/main/java/org/traccar/MainEventHandler.java b/src/main/java/org/traccar/MainEventHandler.java
index 877f03ae7..658ff6d6d 100644
--- a/src/main/java/org/traccar/MainEventHandler.java
+++ b/src/main/java/org/traccar/MainEventHandler.java
@@ -27,6 +27,7 @@ import org.slf4j.LoggerFactory;
 import org.traccar.config.Config;
 import org.traccar.config.Keys;
 import org.traccar.database.StatisticsManager;
+import org.traccar.handler.AcknowledgementHandler;
 import org.traccar.helper.DateUtil;
 import org.traccar.helper.NetworkUtil;
 import org.traccar.helper.model.PositionUtil;
@@ -145,6 +146,8 @@ public class MainEventHandler extends ChannelInboundHandlerAdapter {
             LOGGER.info(builder.toString());
 
             statisticsManager.registerMessageStored(position.getDeviceId(), position.getProtocol());
+
+            ctx.writeAndFlush(new AcknowledgementHandler.EventHandled(position));
         }
     }
 
diff --git a/src/main/java/org/traccar/config/Keys.java b/src/main/java/org/traccar/config/Keys.java
index cb1ee63e1..c207efb1e 100644
--- a/src/main/java/org/traccar/config/Keys.java
+++ b/src/main/java/org/traccar/config/Keys.java
@@ -293,6 +293,13 @@ public final class Keys {
             List.of(KeyType.CONFIG));
 
     /**
+     * Send device responses immediately before writing it in the database.
+     */
+    public static final ConfigKey<Boolean> SERVER_INSTANT_ACKNOWLEDGEMENT = new BooleanConfigKey(
+            "server.instantAcknowledgement",
+            List.of(KeyType.CONFIG));
+
+    /**
      * Address for uploading aggregated anonymous usage statistics. Uploaded information is the same you can see on the
      * statistics screen in the web app. It does not include any sensitive (e.g. locations).
      */
diff --git a/src/main/java/org/traccar/handler/AcknowledgementHandler.java b/src/main/java/org/traccar/handler/AcknowledgementHandler.java
new file mode 100644
index 000000000..c3f6038de
--- /dev/null
+++ b/src/main/java/org/traccar/handler/AcknowledgementHandler.java
@@ -0,0 +1,121 @@
+/*
+ * Copyright 2023 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.handler;
+
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelOutboundHandlerAdapter;
+import io.netty.channel.ChannelPromise;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Set;
+
+public class AcknowledgementHandler extends ChannelOutboundHandlerAdapter {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(AcknowledgementHandler.class);
+
+    public interface Event {
+    }
+
+    public static class EventReceived implements Event {
+    }
+
+    public static class EventDecoded implements Event {
+        private final Collection<Object> objects;
+
+        public EventDecoded(Collection<Object> objects) {
+            this.objects = objects;
+        }
+
+        public Collection<Object> getObjects() {
+            return objects;
+        }
+    }
+
+    public static class EventHandled implements Event {
+        private final Object object;
+
+        public EventHandled(Object object) {
+            this.object = object;
+        }
+
+        public Object getObject() {
+            return object;
+        }
+    }
+
+    private static class Entry {
+        private final Object message;
+        private final ChannelPromise promise;
+
+        private Entry(Object message, ChannelPromise promise) {
+            this.message = message;
+            this.promise = promise;
+        }
+
+        public Object getMessage() {
+            return message;
+        }
+
+        public ChannelPromise getPromise() {
+            return promise;
+        }
+    }
+
+    private List<Entry> queue;
+    private final Set<Object> waiting = new HashSet<>();
+
+    @Override
+    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
+        List<Entry> output = new LinkedList<>();
+        synchronized (this) {
+            if (msg instanceof Event) {
+                if (msg instanceof EventReceived) {
+                    LOGGER.debug("Event received");
+                    if (queue == null) {
+                        queue = new LinkedList<>();
+                    }
+                } else if (msg instanceof EventDecoded) {
+                    EventDecoded event = (EventDecoded) msg;
+                    LOGGER.debug("Event decoded {}", event.getObjects().size());
+                    waiting.addAll(event.getObjects());
+                } else if (msg instanceof EventHandled) {
+                    EventHandled event = (EventHandled) msg;
+                    LOGGER.debug("Event handled");
+                    waiting.remove(event.getObject());
+                }
+                if (!(msg instanceof EventReceived) && waiting.isEmpty()) {
+                    output.addAll(queue);
+                    queue = null;
+                }
+            } else if (queue != null) {
+                LOGGER.debug("Message queued");
+                queue.add(new Entry(msg, promise));
+            } else {
+                LOGGER.debug("Message sent");
+                output.add(new Entry(msg, promise));
+            }
+        }
+        for (Entry entry : output) {
+            ctx.write(entry.getMessage(), entry.getPromise());
+        }
+    }
+
+}
diff --git a/src/main/java/org/traccar/handler/FilterHandler.java b/src/main/java/org/traccar/handler/FilterHandler.java
index 994276bb6..1d1c27b7a 100644
--- a/src/main/java/org/traccar/handler/FilterHandler.java
+++ b/src/main/java/org/traccar/handler/FilterHandler.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 - 2022 Anton Tananaev (anton@traccar.org)
+ * Copyright 2014 - 2023 Anton Tananaev (anton@traccar.org)
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,10 @@
 package org.traccar.handler;
 
 import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.traccar.BaseDataHandler;
 import org.traccar.config.Config;
 import org.traccar.config.Keys;
 import org.traccar.helper.UnitsConverter;
@@ -39,7 +40,7 @@ import java.util.Date;
 
 @Singleton
 @ChannelHandler.Sharable
-public class FilterHandler extends BaseDataHandler {
+public class FilterHandler extends ChannelInboundHandlerAdapter {
 
     private static final Logger LOGGER = LoggerFactory.getLogger(FilterHandler.class);
 
@@ -177,7 +178,7 @@ public class FilterHandler extends BaseDataHandler {
         return false;
     }
 
-    private boolean filter(Position position) {
+    protected boolean filter(Position position) {
 
         StringBuilder filterType = new StringBuilder();
 
@@ -243,11 +244,17 @@ public class FilterHandler extends BaseDataHandler {
     }
 
     @Override
-    protected Position handlePosition(Position position) {
-        if (enabled && filter(position)) {
-            return null;
+    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+        if (msg instanceof Position) {
+            Position position = (Position) msg;
+            if (enabled && filter(position)) {
+                ctx.writeAndFlush(new AcknowledgementHandler.EventHandled(position));
+            } else {
+                ctx.fireChannelRead(position);
+            }
+        } else {
+            super.channelRead(ctx, msg);
         }
-        return position;
     }
 
 }