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/*
* Copyright (c) 2014, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.sjavac.client;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Reader;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import com.sun.tools.javac.main.Main;
import com.sun.tools.javac.main.Main.Result;
import com.sun.tools.sjavac.Log;
import com.sun.tools.sjavac.Util;
import com.sun.tools.sjavac.options.Options;
import com.sun.tools.sjavac.server.PortFile;
import com.sun.tools.sjavac.server.Sjavac;
import com.sun.tools.sjavac.server.SjavacServer;
/**
* Sjavac implementation that delegates requests to a SjavacServer.
*
* This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.
*/
public class SjavacClient implements Sjavac {
private PortFile portFile;
// The servercmd option specifies how the server part of sjavac is spawned.
// It should point to a com.sun.tools.sjavac.Main that supports --startserver
private String serverCommand;
// Accept 120 seconds of inactivity before quitting.
private static final int KEEPALIVE = 120;
private static final int POOLSIZE = Runtime.getRuntime().availableProcessors();
// Wait 2 seconds for response, before giving up on javac server.
private static final int CONNECTION_TIMEOUT = 2000;
private static final int MAX_CONNECT_ATTEMPTS = 3;
private static final int WAIT_BETWEEN_CONNECT_ATTEMPTS = 2000;
public SjavacClient(Options options) {
String serverConf = options.getServerConf();
String configFile = Util.extractStringOption("conf", serverConf, "");
try {
List configFileLines = Files.readAllLines(Path.of(configFile));
String configFileContent = String.join("\n", configFileLines);
String portfileName = Util.extractStringOptionLine("portfile", configFileContent, "");
if (portfileName.isEmpty()) {
Log.error("Configuration file missing value for 'portfile'");
portFile = null;
} else {
portFile = SjavacServer.getPortFile(portfileName);
}
String serverCommandString = Util.extractStringOptionLine("servercmd", configFileContent, "");
if (serverCommandString.isEmpty()) {
Log.error("Configuration file missing value for 'servercmd'");
serverCommand = null;
} else {
serverCommand = serverCommandString;
}
} catch (IOException e) {
Log.error("Cannot read configuration file " + configFile);
Log.debug(e);
portFile = null;
serverCommand = null;
}
}
@Override
public Result compile(String[] args) {
if (portFile == null || serverCommand == null) {
Log.error("Incorrect configuration, portfile and/or servercmd missing");
return Result.ERROR;
}
Result result = null;
try (Socket socket = tryConnect()) {
PrintWriter out = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
// Send args array to server
out.println(args.length);
for (String arg : args)
out.println(arg);
out.flush();
// Read server response line by line
String line;
while (null != (line = in.readLine())) {
if (!line.contains(":")) {
throw new AssertionError("Could not parse protocol line: >>\"" + line + "\"<<");
}
String[] typeAndContent = line.split(":", 2);
String type = typeAndContent[0];
String content = typeAndContent[1];
try {
if (Log.isDebugging()) {
// Distinguish server generated output if debugging.
content = "[sjavac-server] " + content;
}
Log.log(Log.Level.valueOf(type), content);
continue;
} catch (IllegalArgumentException e) {
// Parsing of 'type' as log level failed.
}
if (type.equals(SjavacServer.LINE_TYPE_RC)) {
result = Main.Result.valueOf(content);
}
}
} catch (PortFileInaccessibleException e) {
Log.error("Port file inaccessible.");
result = Result.ERROR;
} catch (IOException ioe) {
Log.error("IOException caught during compilation: " + ioe.getMessage());
Log.debug(ioe);
result = Result.ERROR;
} catch (InterruptedException ie) {
Thread.currentThread().interrupt(); // Restore interrupt
Log.error("Compilation interrupted.");
Log.debug(ie);
result = Result.ERROR;
}
if (result == null) {
// No LINE_TYPE_RC was found.
result = Result.ERROR;
}
return result;
}
/*
* Makes MAX_CONNECT_ATTEMPTS attempts to connect to server.
*/
private Socket tryConnect() throws IOException, InterruptedException {
makeSureServerIsRunning();
int attempt = 0;
while (true) {
Log.debug("Trying to connect. Attempt " + (++attempt) + " of " + MAX_CONNECT_ATTEMPTS);
try {
return makeConnectionAttempt();
} catch (IOException ex) {
Log.error("Connection attempt failed: " + ex.getMessage());
if (attempt >= MAX_CONNECT_ATTEMPTS) {
Log.error("Giving up");
throw new IOException("Could not connect to server", ex);
}
}
Thread.sleep(WAIT_BETWEEN_CONNECT_ATTEMPTS);
}
}
private Socket makeConnectionAttempt() throws IOException {
Socket socket = new Socket();
InetAddress localhost = InetAddress.getByName(null);
InetSocketAddress address = new InetSocketAddress(localhost, portFile.getPort());
socket.connect(address, CONNECTION_TIMEOUT);
Log.debug("Connected");
return socket;
}
/*
* Will return immediately if a server already seems to be running,
* otherwise fork a new server and block until it seems to be running.
*/
private void makeSureServerIsRunning()
throws IOException, InterruptedException {
if (portFile.exists()) {
portFile.lock();
portFile.getValues();
portFile.unlock();
if (portFile.containsPortInfo()) {
// Server seems to already be running
return;
}
}
// Fork a new server and wait for it to start
startNewServer();
}
@Override
public void shutdown() {
// Nothing to clean up
}
/*
* Fork a server process process and wait for server to come around
*/
public void startNewServer()
throws IOException, InterruptedException {
List cmd = new ArrayList<>();
cmd.addAll(Arrays.asList(serverCommand.split(" ")));
cmd.add("--startserver:"
+ "portfile=" + portFile.getFilename()
+ ",poolsize=" + POOLSIZE
+ ",keepalive="+ KEEPALIVE);
Process serverProcess;
Log.debug("Starting server. Command: " + String.join(" ", cmd));
try {
// If the cmd for some reason can't be executed (file is not found,
// or is not executable for instance) this will throw an
// IOException and p == null.
serverProcess = new ProcessBuilder(cmd)
.redirectErrorStream(true)
.start();
} catch (IOException ex) {
// Message is typically something like:
// Cannot run program "xyz": error=2, No such file or directory
Log.error("Failed to create server process: " + ex.getMessage());
Log.debug(ex);
throw new IOException(ex);
}
// serverProcess != null at this point.
try {
// Throws an IOException if no valid values materialize
portFile.waitForValidValues();
} catch (IOException ex) {
// Process was started, but server failed to initialize. This could
// for instance be due to the JVM not finding the server class,
// or the server running in to some exception early on.
Log.error("Sjavac server failed to initialize: " + ex.getMessage());
Log.error("Process output:");
Reader serverStdoutStderr = new InputStreamReader(serverProcess.getInputStream());
try (BufferedReader br = new BufferedReader(serverStdoutStderr)) {
br.lines().forEach(Log::error);
}
Log.error("");
try {
Log.error("Process exit code: " + serverProcess.exitValue());
} catch (IllegalThreadStateException e) {
// Server is presumably still running.
}
throw new IOException("Server failed to initialize: " + ex.getMessage(), ex);
}
}
}