192 lines
7.7 KiB
Java
192 lines
7.7 KiB
Java
/*
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* Copyright (c) 2014, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javacserver.client;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.OutputStreamWriter;
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import java.io.PrintWriter;
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import java.io.Reader;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.net.Socket;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import javacserver.server.Server;
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import javacserver.shared.PortFileInaccessibleException;
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import javacserver.shared.Protocol;
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import javacserver.shared.Result;
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import javacserver.util.AutoFlushWriter;
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import javacserver.util.Log;
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/**
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* The javacserver client. This is called from the makefiles, and is responsible for passing the command
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* line on to a server instance running javac, starting a new server if needed.
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*/
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public class Client {
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private static final Log.Level LOG_LEVEL = Log.Level.INFO;
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// Wait 4 seconds for response, before giving up on javac server.
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private static final int CONNECTION_TIMEOUT = 4000;
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private static final int MAX_CONNECT_ATTEMPTS = 10;
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private static final int WAIT_BETWEEN_CONNECT_ATTEMPTS = 2000;
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private final ClientConfiguration conf;
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public Client(ClientConfiguration conf) {
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this.conf = conf;
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}
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public static void main(String... args) {
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Log.setLogForCurrentThread(new Log(
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new AutoFlushWriter(new OutputStreamWriter(System.out)),
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new AutoFlushWriter(new OutputStreamWriter(System.err))));
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Log.setLogLevel(LOG_LEVEL);
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ClientConfiguration conf = ClientConfiguration.fromCommandLineArguments(args);
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if (conf == null) {
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System.exit(Result.CMDERR.exitCode);
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}
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Client client = new Client(conf);
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int exitCode = client.dispatchToServer();
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System.exit(exitCode);
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}
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private int dispatchToServer() {
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try {
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// Check if server seems to be already running
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if (!conf.portFile().hasValidValues()) {
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// Fork a new server and wait for it to start
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startNewServer();
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}
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try (Socket socket = tryConnect()) {
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BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
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PrintWriter out = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));
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Protocol.sendCommand(out, conf.javacArgs());
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int exitCode = Protocol.readResponse(in);
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return exitCode;
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}
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} catch (PortFileInaccessibleException e) {
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Log.error("Port file inaccessible.");
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return Result.ERROR.exitCode;
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} catch (IOException ioe) {
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Log.error("IOException caught during compilation: " + ioe.getMessage());
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Log.debug(ioe);
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return Result.ERROR.exitCode;
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} catch (InterruptedException ie) {
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Thread.currentThread().interrupt(); // Restore interrupt
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Log.error("Compilation interrupted.");
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Log.debug(ie);
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return Result.ERROR.exitCode;
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}
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}
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/*
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* Makes MAX_CONNECT_ATTEMPTS attempts to connect to server.
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*/
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private Socket tryConnect() throws IOException, InterruptedException {
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int attempt = 0;
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while (true) {
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Log.debug("Trying to connect. Attempt " + (++attempt) + " of " + MAX_CONNECT_ATTEMPTS);
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try {
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Socket socket = new Socket();
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InetAddress localhost = InetAddress.getByName(null);
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InetSocketAddress address = new InetSocketAddress(localhost, conf.portFile().getPort());
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socket.connect(address, CONNECTION_TIMEOUT);
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Log.debug("Connected");
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return socket;
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} catch (IOException ex) {
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Log.error("Connection attempt failed: " + ex.getMessage());
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if (attempt >= MAX_CONNECT_ATTEMPTS) {
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Log.error("Giving up");
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throw new IOException("Could not connect to server after " + MAX_CONNECT_ATTEMPTS + " attempts with timeout " + CONNECTION_TIMEOUT, ex);
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}
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}
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Thread.sleep(WAIT_BETWEEN_CONNECT_ATTEMPTS);
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}
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}
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/*
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* Fork a server process and wait for server to come around
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*/
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private void startNewServer() throws IOException, InterruptedException {
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List<String> cmd = new ArrayList<>();
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// conf.javaCommand() is how to start java in the way we want to run
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// the server
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cmd.addAll(Arrays.asList(conf.javaCommand().split(" ")));
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// javacserver.server.Server is the server main class
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cmd.add(Server.class.getName());
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// and it expects a port file path
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cmd.add(conf.portFile().getFilename());
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Process serverProcess;
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Log.debug("Starting server. Command: " + String.join(" ", cmd));
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try {
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// If the cmd for some reason can't be executed (file is not found,
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// or is not executable for instance) this will throw an
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// IOException
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serverProcess = new ProcessBuilder(cmd).redirectErrorStream(true).start();
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} catch (IOException ex) {
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// Message is typically something like:
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// Cannot run program "xyz": error=2, No such file or directory
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Log.error("Failed to create server process: " + ex.getMessage());
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Log.debug(ex);
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throw new IOException(ex);
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}
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// serverProcess != null at this point.
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try {
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// Throws an IOException if no valid values materialize
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conf.portFile().waitForValidValues();
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} catch (IOException ex) {
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// Process was started, but server failed to initialize. This could
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// for instance be due to the JVM not finding the server class,
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// or the server running in to some exception early on.
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Log.error("javacserver server process failed to initialize: " + ex.getMessage());
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Log.error("Process output:");
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Reader serverStdoutStderr = new InputStreamReader(serverProcess.getInputStream());
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try (BufferedReader br = new BufferedReader(serverStdoutStderr)) {
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br.lines().forEach(Log::error);
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}
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Log.error("<End of process output>");
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try {
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Log.error("Process exit code: " + serverProcess.exitValue());
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} catch (IllegalThreadStateException e) {
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// Server is presumably still running.
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}
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throw new IOException("Server failed to initialize: " + ex.getMessage(), ex);
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}
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}
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}
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