[rpc] use callback func to do send & recv (#4147)

* [rpc] use callback func to do send & recv. don't get fd from sock as it is deprecated in java

* fix java build

* fix min/max macro define in windows

* keep the old rpc setup for py

* add doc for CallbackChannel

Author: yzhliu

jvm/core/src/main/java/ml/dmlc/tvm/rpc/ConnectProxyServerProcessor.java

@@ -30,7 +30,6 @@ public class ConnectProxyServerProcessor implements ServerProcessor {
   private final String host;
   private final int port;
   private final String key;
-  private final SocketFileDescriptorGetter socketFileDescriptorGetter;
 
   private volatile Socket currSocket = new Socket();
   private Runnable callback;
@@ -40,14 +39,11 @@ public class ConnectProxyServerProcessor implements ServerProcessor {
    * @param host Proxy server host.
    * @param port Proxy server port.
    * @param key Proxy server key.
-   * @param sockFdGetter Method to get file descriptor from Java socket.
    */
-  public ConnectProxyServerProcessor(String host, int port, String key,
-      SocketFileDescriptorGetter sockFdGetter) {
+  public ConnectProxyServerProcessor(String host, int port, String key) {
     this.host = host;
     this.port = port;
     this.key = "server:" + key;
-    socketFileDescriptorGetter = sockFdGetter;
   }
 
   /** 
@@ -70,8 +66,8 @@ public void setStartTimeCallback(Runnable callback) {
     try {
       SocketAddress address = new InetSocketAddress(host, port);
       currSocket.connect(address, 6000);
-      InputStream in = currSocket.getInputStream();
-      OutputStream out = currSocket.getOutputStream();
+      final InputStream in = currSocket.getInputStream();
+      final OutputStream out = currSocket.getOutputStream();
       out.write(Utils.toBytes(RPC.RPC_MAGIC));
       out.write(Utils.toBytes(key.length()));
       out.write(Utils.toBytes(key));
@@ -91,11 +87,10 @@ public void setStartTimeCallback(Runnable callback) {
       if (callback != null) {
         callback.run();
       }
-      final int sockFd = socketFileDescriptorGetter.get(currSocket);
-      if (sockFd != -1) {
-        new NativeServerLoop(sockFd).run();
-        System.err.println("Finish serving " + address);
-      }
+
+      SocketChannel sockChannel = new SocketChannel(currSocket);
+      new NativeServerLoop(sockChannel.getFsend(), sockChannel.getFrecv()).run();
+      System.err.println("Finish serving " + address);
     } catch (Throwable e) {
       e.printStackTrace();
       throw new RuntimeException(e);

jvm/core/src/main/java/ml/dmlc/tvm/rpc/ConnectTrackerServerProcessor.java

@@ -37,7 +37,6 @@
  */
 public class ConnectTrackerServerProcessor implements ServerProcessor {
   private ServerSocket server;
-  private final SocketFileDescriptorGetter socketFileDescriptorGetter;
   private final String trackerHost;
   private final int trackerPort;
   // device key
@@ -62,10 +61,11 @@ public class ConnectTrackerServerProcessor implements ServerProcessor {
    * @param trackerHost Tracker host.
    * @param trackerPort Tracker port.
    * @param key Device key.
-   * @param sockFdGetter Method to get file descriptor from Java socket.
+   * @param watchdog watch for timeout, etc.
+   * @throws java.io.IOException when socket fails to open.
    */
   public ConnectTrackerServerProcessor(String trackerHost, int trackerPort, String key,
-      SocketFileDescriptorGetter sockFdGetter, RPCWatchdog watchdog) throws IOException {
+      RPCWatchdog watchdog) throws IOException {
     while (true) {
       try {
         this.server = new ServerSocket(serverPort);
@@ -81,7 +81,6 @@ public ConnectTrackerServerProcessor(String trackerHost, int trackerPort, String
       }
     }
     System.err.println("using port: " + serverPort);
-    this.socketFileDescriptorGetter = sockFdGetter;
     this.trackerHost = trackerHost;
     this.trackerPort = trackerPort;
     this.key = key;
@@ -163,11 +162,9 @@ public String getMatchKey() {
       System.err.println("Connection from " + socket.getRemoteSocketAddress().toString());
       // received timeout in seconds
       watchdog.startTimeout(timeout * 1000);
-      final int sockFd = socketFileDescriptorGetter.get(socket);
-      if (sockFd != -1) {
-        new NativeServerLoop(sockFd).run();
-        System.err.println("Finish serving " + socket.getRemoteSocketAddress().toString());
-      }
+      SocketChannel sockChannel = new SocketChannel(socket);
+      new NativeServerLoop(sockChannel.getFsend(), sockChannel.getFrecv()).run();
+      System.err.println("Finish serving " + socket.getRemoteSocketAddress().toString());
       Utils.closeQuietly(socket);
     } catch (ConnectException e) {
       // if the tracker connection failed, wait a bit before retrying

jvm/core/src/main/java/ml/dmlc/tvm/rpc/NativeServerLoop.java

@@ -28,22 +28,25 @@
  * Call native ServerLoop on socket file descriptor.
  */
 public class NativeServerLoop implements Runnable {
-  private final int sockFd;
+  private final Function fsend;
+  private final Function frecv;
 
   /**
    * Constructor for NativeServerLoop.
-   * @param nativeSockFd native socket file descriptor.
+   * @param fsend socket.send function.
+   * @param frecv socket.recv function.
    */
-  public NativeServerLoop(final int nativeSockFd) {
-    sockFd = nativeSockFd;
+  public NativeServerLoop(final Function fsend, final Function frecv) {
+    this.fsend = fsend;
+    this.frecv = frecv;
   }
 
   @Override public void run() {
     File tempDir = null;
     try {
       tempDir = serverEnv();
       System.err.println("starting server loop...");
-      RPC.getApi("_ServerLoop").pushArg(sockFd).invoke();
+      RPC.getApi("_ServerLoop").pushArg(fsend).pushArg(frecv).invoke();
       System.err.println("done server loop...");
     } catch (IOException e) {
       e.printStackTrace();

jvm/core/src/main/java/ml/dmlc/tvm/rpc/RPCSession.java

@@ -200,6 +200,7 @@ public void upload(byte[] data, String target) {
    * Upload file to remote runtime temp folder.
    * @param data The file in local to upload.
    * @param target The path in remote.
+   * @throws java.io.IOException for network failure.
    */
   public void upload(File data, String target) throws IOException {
     byte[] blob = getBytesFromFile(data);
@@ -209,6 +210,7 @@ public void upload(File data, String target) throws IOException {
   /**
    * Upload file to remote runtime temp folder.
    * @param data The file in local to upload.
+   * @throws java.io.IOException for network failure.
    */
   public void upload(File data) throws IOException {
     upload(data, data.getName());

jvm/core/src/main/java/ml/dmlc/tvm/rpc/Server.java

@@ -17,31 +17,12 @@
 
 package ml.dmlc.tvm.rpc;
 
-import sun.misc.SharedSecrets;
-
-import java.io.FileDescriptor;
-import java.io.FileInputStream;
 import java.io.IOException;
-import java.io.InputStream;
-import java.net.Socket;
 
 /**
  * RPC Server.
  */
 public class Server {
-  private static SocketFileDescriptorGetter defaultSocketFdGetter
-      = new SocketFileDescriptorGetter() {
-          @Override public int get(Socket socket) {
-            try {
-              InputStream is = socket.getInputStream();
-              FileDescriptor fd = ((FileInputStream) is).getFD();
-              return SharedSecrets.getJavaIOFileDescriptorAccess().get(fd);
-            } catch (IOException e) {
-              e.printStackTrace();
-              return -1;
-            }
-          }
-        };
   private final WorkerThread worker;
 
   private static class WorkerThread extends Thread {
@@ -72,35 +53,10 @@ public void terminate() {
   /**
    * Start a standalone server.
    * @param serverPort Port.
-   * @param socketFdGetter Method to get system file descriptor of the server socket.
-   * @throws IOException if failed to bind localhost:port.
-   */
-  public Server(int serverPort, SocketFileDescriptorGetter socketFdGetter) throws IOException {
-    worker = new WorkerThread(new StandaloneServerProcessor(serverPort, socketFdGetter));
-  }
-
-  /**
-   * Start a standalone server.
-   * Use sun.misc.SharedSecrets.getJavaIOFileDescriptorAccess
-   * to get file descriptor for the socket.
-   * @param serverPort Port.
    * @throws IOException if failed to bind localhost:port.
    */
   public Server(int serverPort) throws IOException {
-    this(serverPort, defaultSocketFdGetter);
-  }
-
-  /**
-   * Start a server connected to proxy.
-   * @param proxyHost The proxy server host.
-   * @param proxyPort The proxy server port.
-   * @param key The key to identify the server.
-   * @param socketFdGetter Method to get system file descriptor of the server socket.
-   */
-  public Server(String proxyHost, int proxyPort, String key,
-      SocketFileDescriptorGetter socketFdGetter) {
-    worker = new WorkerThread(
-      new ConnectProxyServerProcessor(proxyHost, proxyPort, key, socketFdGetter));
+    worker = new WorkerThread(new StandaloneServerProcessor(serverPort));
   }
 
   /**
@@ -112,7 +68,8 @@ public Server(String proxyHost, int proxyPort, String key,
    * @param key The key to identify the server.
    */
   public Server(String proxyHost, int proxyPort, String key) {
-    this(proxyHost, proxyPort, key, defaultSocketFdGetter);
+    worker = new WorkerThread(
+        new ConnectProxyServerProcessor(proxyHost, proxyPort, key));
   }
 
   /**

jvm/core/src/main/java/ml/dmlc/tvm/rpc/SocketChannel.java

@@ -0,0 +1,49 @@
+package ml.dmlc.tvm.rpc;
+
+import ml.dmlc.tvm.Function;
+import ml.dmlc.tvm.TVMValue;
+import ml.dmlc.tvm.TVMValueBytes;
+
+import java.io.IOException;
+import java.net.Socket;
+
+public class SocketChannel {
+  private final Socket socket;
+
+  SocketChannel(Socket sock) {
+    socket = sock;
+  }
+
+  private Function fsend = Function.convertFunc(new Function.Callback() {
+    @Override public Object invoke(TVMValue... args) {
+      byte[] data = args[0].asBytes();
+      try {
+        socket.getOutputStream().write(data);
+      } catch (IOException e) {
+        e.printStackTrace();
+        return -1;
+      }
+      return data.length;
+    }
+  });
+
+  private Function frecv = Function.convertFunc(new Function.Callback() {
+    @Override public Object invoke(TVMValue... args) {
+      long size = args[0].asLong();
+      try {
+        return new TVMValueBytes(Utils.recvAll(socket.getInputStream(), (int) size));
+      } catch (IOException e) {
+        e.printStackTrace();
+        return -1;
+      }
+    }
+  });
+
+  public Function getFsend() {
+    return fsend;
+  }
+
+  public Function getFrecv() {
+    return frecv;
+  }
+}

jvm/core/src/main/java/ml/dmlc/tvm/rpc/SocketFileDescriptorGetter.java

@@ -28,12 +28,9 @@
  */
 public class StandaloneServerProcessor implements ServerProcessor {
   private final ServerSocket server;
-  private final SocketFileDescriptorGetter socketFileDescriptorGetter;
 
-  public StandaloneServerProcessor(int serverPort,
-      SocketFileDescriptorGetter sockFdGetter) throws IOException {
+  public StandaloneServerProcessor(int serverPort) throws IOException {
     this.server = new ServerSocket(serverPort);
-    this.socketFileDescriptorGetter = sockFdGetter;
   }
 
   @Override public void terminate() {
@@ -46,9 +43,9 @@ public StandaloneServerProcessor(int serverPort,
 
   @Override public void run() {
     try {
-      Socket socket = server.accept();
-      InputStream in = socket.getInputStream();
-      OutputStream out = socket.getOutputStream();
+      final Socket socket = server.accept();
+      final InputStream in = socket.getInputStream();
+      final OutputStream out = socket.getOutputStream();
       int magic = Utils.wrapBytes(Utils.recvAll(in, 4)).getInt();
       if (magic != RPC.RPC_MAGIC) {
         Utils.closeQuietly(socket);
@@ -66,12 +63,10 @@ public StandaloneServerProcessor(int serverPort,
         out.write(Utils.toBytes(serverKey));
       }
 
+      SocketChannel sockChannel = new SocketChannel(socket);
       System.err.println("Connection from " + socket.getRemoteSocketAddress().toString());
-      final int sockFd = socketFileDescriptorGetter.get(socket);
-      if (sockFd != -1) {
-        new NativeServerLoop(sockFd).run();
-        System.err.println("Finish serving " + socket.getRemoteSocketAddress().toString());
-      }
+      new NativeServerLoop(sockChannel.getFsend(), sockChannel.getFrecv()).run();
+      System.err.println("Finish serving " + socket.getRemoteSocketAddress().toString());
       Utils.closeQuietly(socket);
     } catch (Throwable e) {
       e.printStackTrace();

jvm/core/src/main/java/ml/dmlc/tvm/rpc/StandaloneServerProcessor.java

@@ -17,7 +17,10 @@
 
 package ml.dmlc.tvm.contrib;
 
-import ml.dmlc.tvm.*;
+import ml.dmlc.tvm.Module;
+import ml.dmlc.tvm.NDArray;
+import ml.dmlc.tvm.TVMContext;
+import ml.dmlc.tvm.TestUtils;
 import ml.dmlc.tvm.rpc.Client;
 import ml.dmlc.tvm.rpc.RPCSession;
 import ml.dmlc.tvm.rpc.Server;

jvm/core/src/test/java/ml/dmlc/tvm/contrib/GraphRuntimeTest.java

@@ -164,8 +164,8 @@
         <artifactId>maven-compiler-plugin</artifactId>
         <version>3.3</version>
         <configuration>
-          <source>1.6</source>
-          <target>1.6</target>
+          <source>1.7</source>
+          <target>1.7</target>
           <encoding>UTF-8</encoding>
         </configuration>
       </plugin>