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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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package org.chromium.sdk.internal.transport;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.Writer;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.Future;
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import java.util.concurrent.FutureTask;
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import java.util.concurrent.RunnableFuture;
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import org.chromium.sdk.internal.transport.Message.MalformedMessageException;
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/**
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* Handshaker handles "handshake" part of communication. It may write and read whatever it needs
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* before regular message-based communication has started.
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*/
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public interface Handshaker {
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/**
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* Performs handshake. This method is blocking. After it has successfully finished, input/output
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* should be ready for normal message-based communication. In case method fails with IOException,
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* input and output are returned in undefined state.
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* @throws IOException if handshake process failed physically (input or output has unexpectedly
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* closed) or logically (if unexpected message came from remote).
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*/
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void perform(BufferedReader input, Writer output) throws IOException;
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/**
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* Implementation of handshake from Google Chrome Developer Tools Protocol. Used when we
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* connect to browser.
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*/
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Handshaker CHROMIUM = new Handshaker() {
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public void perform(BufferedReader input, Writer output) throws IOException {
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output.write(OUTGOING_MESSAGE);
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output.flush();
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// TODO(prybin): expose this as a parameter or get rid of this option if we don't need it.
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final boolean ignoreUnexpectedResponses = false;
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while (true) {
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if (Thread.interrupted()) {
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throw new IOException("Interrupted");
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}
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String line = input.readLine();
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if (line == null) {
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throw new IOException("Connection closed");
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}
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if (INCOMING_TEXT.equals(line)) {
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break;
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}
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if (!ignoreUnexpectedResponses) {
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throw new IOException("Unexpected handshake: " + line);
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}
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}
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}
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/**
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* A handshake string to be sent by a browser on the connection start,
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* specified by the protocol design doc (without trailing cr/lf).
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*/
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private static final String INCOMING_TEXT = "ChromeDevToolsHandshake";
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/**
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* A handshake string that we send to a browser on the connection start,
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* specified by the protocol design doc (including trailing cr/lf).
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*/
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private static final String OUTGOING_MESSAGE = "ChromeDevToolsHandshake\r\n";
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};
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/**
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* Stateful handshaker implementation for Standalone V8 protocol.
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*/
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class StandaloneV8 implements Handshaker {
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public interface RemoteInfo {
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String getProtocolVersion();
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String getV8VmVersion();
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String getEmbeddingHostName();
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}
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public Future<RemoteInfo> getRemoteInfo() {
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return runnableFuture;
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}
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private final RunnableFuture<RemoteInfo> runnableFuture =
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new FutureTask<RemoteInfo>(new HandshakeTaks());
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private BufferedReader input = null;
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public void perform(BufferedReader input, Writer output) throws IOException {
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this.input = input;
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runnableFuture.run();
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// Check for possible exceptions
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try {
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runnableFuture.get();
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} catch (InterruptedException e) {
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throw new RuntimeException(e);
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} catch (ExecutionException e) {
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throw new IOException("Failed to perform handshake", e);
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}
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}
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class HandshakeTaks implements Callable<RemoteInfo> {
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public RemoteInfo call() throws IOException {
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final Message message;
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try {
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message = Message.fromBufferedReader(input);
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} catch (MalformedMessageException e) {
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throw new IOException("Unrecognized handshake message from remote", e);
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}
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if (message == null) {
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throw new IOException("End of stream");
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}
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final String protocolVersion = message.getHeader("Protocol-Version", null);
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if (protocolVersion == null) {
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throw new IOException("Absent protocol version");
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}
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final String vmVersion = message.getHeader("V8-Version", null);
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if (vmVersion == null) {
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throw new IOException("Absent V8 VM version");
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}
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RemoteInfo remoteInfo = new RemoteInfo() {
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public String getProtocolVersion() {
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return protocolVersion;
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}
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public String getV8VmVersion() {
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return vmVersion;
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}
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public String getEmbeddingHostName() {
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return message.getHeader("Embedding-Host", null);
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}
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};
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return remoteInfo;
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}
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}
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}
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}
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