Extract ControlChannel class

This prevents many components from depending on the whole
DesktopConnection.

server/src/main/java/com/genymobile/scrcpy/ControlChannel.java

@@ -0,0 +1,33 @@
+package com.genymobile.scrcpy;
+
+import android.net.LocalSocket;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public final class ControlChannel {
+    private final InputStream inputStream;
+    private final OutputStream outputStream;
+
+    private final ControlMessageReader reader = new ControlMessageReader();
+    private final DeviceMessageWriter writer = new DeviceMessageWriter();
+
+    public ControlChannel(LocalSocket controlSocket) throws IOException {
+        this.inputStream = controlSocket.getInputStream();
+        this.outputStream = controlSocket.getOutputStream();
+    }
+
+    public ControlMessage recv() throws IOException {
+        ControlMessage msg = reader.next();
+        while (msg == null) {
+            reader.readFrom(inputStream);
+            msg = reader.next();
+        }
+        return msg;
+    }
+
+    public void send(DeviceMessage msg) throws IOException {
+        writer.writeTo(msg, outputStream);
+    }
+}

server/src/main/java/com/genymobile/scrcpy/Controller.java

@@ -27,7 +27,7 @@ public class Controller implements AsyncProcessor {
     private Thread thread;
 
     private final Device device;
-    private final DesktopConnection connection;
+    private final ControlChannel controlChannel;
     private final CleanUp cleanUp;
     private final DeviceMessageSender sender;
     private final boolean clipboardAutosync;
@@ -42,14 +42,14 @@ public class Controller implements AsyncProcessor {
 
     private boolean keepPowerModeOff;
 
-    public Controller(Device device, DesktopConnection connection, CleanUp cleanUp, boolean clipboardAutosync, boolean powerOn) {
+    public Controller(Device device, ControlChannel controlChannel, CleanUp cleanUp, boolean clipboardAutosync, boolean powerOn) {
         this.device = device;
-        this.connection = connection;
+        this.controlChannel = controlChannel;
         this.cleanUp = cleanUp;
         this.clipboardAutosync = clipboardAutosync;
         this.powerOn = powerOn;
         initPointers();
-        sender = new DeviceMessageSender(connection);
+        sender = new DeviceMessageSender(controlChannel);
     }
 
     private void initPointers() {
@@ -123,7 +123,7 @@ public class Controller implements AsyncProcessor {
     }
 
     private void handleEvent() throws IOException {
-        ControlMessage msg = connection.receiveControlMessage();
+        ControlMessage msg = controlChannel.recv();
         switch (msg.getType()) {
             case ControlMessage.TYPE_INJECT_KEYCODE:
                 if (device.supportsInputEvents()) {

server/src/main/java/com/genymobile/scrcpy/DesktopConnection.java

@@ -7,8 +7,6 @@ import android.net.LocalSocketAddress;
 import java.io.Closeable;
 import java.io.FileDescriptor;
 import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
 import java.nio.charset.StandardCharsets;
 
 public final class DesktopConnection implements Closeable {
@@ -24,25 +22,16 @@ public final class DesktopConnection implements Closeable {
     private final FileDescriptor audioFd;
 
     private final LocalSocket controlSocket;
-    private final InputStream controlInputStream;
-    private final OutputStream controlOutputStream;
-
-    private final ControlMessageReader reader = new ControlMessageReader();
-    private final DeviceMessageWriter writer = new DeviceMessageWriter();
+    private final ControlChannel controlChannel;
 
     private DesktopConnection(LocalSocket videoSocket, LocalSocket audioSocket, LocalSocket controlSocket) throws IOException {
         this.videoSocket = videoSocket;
-        this.controlSocket = controlSocket;
         this.audioSocket = audioSocket;
-        if (controlSocket != null) {
-            controlInputStream = controlSocket.getInputStream();
-            controlOutputStream = controlSocket.getOutputStream();
-        } else {
-            controlInputStream = null;
-            controlOutputStream = null;
-        }
+        this.controlSocket = controlSocket;
+
         videoFd = videoSocket != null ? videoSocket.getFileDescriptor() : null;
         audioFd = audioSocket != null ? audioSocket.getFileDescriptor() : null;
+        controlChannel = controlSocket != null ? new ControlChannel(controlSocket) : null;
     }
 
     private static LocalSocket connect(String abstractName) throws IOException {
@@ -179,16 +168,7 @@ public final class DesktopConnection implements Closeable {
         return audioFd;
     }
 
-    public ControlMessage receiveControlMessage() throws IOException {
-        ControlMessage msg = reader.next();
-        while (msg == null) {
-            reader.readFrom(controlInputStream);
-            msg = reader.next();
-        }
-        return msg;
-    }
-
-    public void sendDeviceMessage(DeviceMessage msg) throws IOException {
-        writer.writeTo(msg, controlOutputStream);
+    public ControlChannel getControlChannel() {
+        return controlChannel;
     }
 }

server/src/main/java/com/genymobile/scrcpy/DeviceMessageSender.java

@@ -4,7 +4,7 @@ import java.io.IOException;
 
 public final class DeviceMessageSender {
 
-    private final DesktopConnection connection;
+    private final ControlChannel controlChannel;
 
     private Thread thread;
 
@@ -12,8 +12,8 @@ public final class DeviceMessageSender {
 
     private long ack;
 
-    public DeviceMessageSender(DesktopConnection connection) {
-        this.connection = connection;
+    public DeviceMessageSender(ControlChannel controlChannel) {
+        this.controlChannel = controlChannel;
     }
 
     public synchronized void pushClipboardText(String text) {
@@ -43,11 +43,11 @@ public final class DeviceMessageSender {
 
             if (sequence != DeviceMessage.SEQUENCE_INVALID) {
                 DeviceMessage event = DeviceMessage.createAckClipboard(sequence);
-                connection.sendDeviceMessage(event);
+                controlChannel.send(event);
             }
             if (text != null) {
                 DeviceMessage event = DeviceMessage.createClipboard(text);
-                connection.sendDeviceMessage(event);
+                controlChannel.send(event);
             }
         }
     }

server/src/main/java/com/genymobile/scrcpy/Server.java

@@ -131,7 +131,8 @@ public final class Server {
             }
 
             if (control) {
-                Controller controller = new Controller(device, connection, cleanUp, options.getClipboardAutosync(), options.getPowerOn());
+                ControlChannel controlChannel = connection.getControlChannel();
+                Controller controller = new Controller(device, controlChannel, cleanUp, options.getClipboardAutosync(), options.getPowerOn());
                 device.setClipboardListener(text -> controller.getSender().pushClipboardText(text));
                 asyncProcessors.add(controller);
             }