// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package org.chromium.sdk.internal.v8native;
import java.util.Collections;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.chromium.sdk.Breakpoint;
import org.chromium.sdk.DebugContext;
import org.chromium.sdk.DebugEventListener;
import org.chromium.sdk.InvalidContextException;
import org.chromium.sdk.JavascriptVm;
import org.chromium.sdk.JavascriptVm.ScriptsCallback;
import org.chromium.sdk.JavascriptVm.SuspendCallback;
import org.chromium.sdk.RelayOk;
import org.chromium.sdk.SyncCallback;
import org.chromium.sdk.Version;
import org.chromium.sdk.internal.v8native.InternalContext.ContextDismissedCheckedException;
import org.chromium.sdk.internal.v8native.protocol.V8ProtocolUtil;
import org.chromium.sdk.internal.v8native.protocol.input.CommandResponse;
import org.chromium.sdk.internal.v8native.protocol.input.SuccessCommandResponse;
import org.chromium.sdk.internal.v8native.protocol.output.ContextlessDebuggerMessage;
import org.chromium.sdk.internal.v8native.protocol.output.DebuggerMessageFactory;
import org.chromium.sdk.util.AsyncFuture;
import org.chromium.sdk.util.AsyncFuture.Callback;
import org.chromium.sdk.util.AsyncFutureRef;
import org.chromium.sdk.util.MethodIsBlockingException;
import org.chromium.sdk.util.RelaySyncCallback;
/**
* A class that holds and administers main parts of debug protocol implementation.
*/
public class DebugSession {
private static final Logger LOGGER = Logger.getLogger(DebugSession.class.getName());
/** The script manager for the associated tab. */
private final ScriptManager scriptManager;
private final V8CommandProcessor v8CommandProcessor;
private final ContextBuilder contextBuilder;
/** Our manager. */
private DebugSessionManager sessionManager;
/** Context owns breakpoint manager. */
private final BreakpointManager breakpointManager;
private final ScriptManagerProxy scriptManagerProxy = new ScriptManagerProxy(this);
private final DefaultResponseHandler defaultResponseHandler;
private final JavascriptVm javascriptVm;
private volatile Version vmVersion = null;
public DebugSession(DebugSessionManager sessionManager, V8ContextFilter contextFilter,
V8CommandOutput v8CommandOutput, JavascriptVm javascriptVm) {
this.scriptManager = new ScriptManager(contextFilter, this);
this.sessionManager = sessionManager;
this.javascriptVm = javascriptVm;
this.breakpointManager = new BreakpointManager(this);
this.defaultResponseHandler = new DefaultResponseHandler(this);
this.v8CommandProcessor = new V8CommandProcessor(v8CommandOutput, defaultResponseHandler,
this);
this.contextBuilder = new ContextBuilder(this);
}
public ScriptManager getScriptManager() {
return scriptManager;
}
public V8CommandProcessor getV8CommandProcessor() {
return v8CommandProcessor;
}
public DebugSessionManager getSessionManager() {
return sessionManager;
}
public void onDebuggerDetached() {
getSessionManager().onDebuggerDetached();
getScriptManager().reset();
contextBuilder.forceCancelContext();
}
/**
* Sends V8 command messages, but only those which doesn't depend on context.
* Use {@code InternalContext} if you need to send context-specific commands.
* @return
*/
public RelayOk sendMessageAsync(ContextlessDebuggerMessage message, boolean isImmediate,
V8CommandProcessor.V8HandlerCallback commandCallback, SyncCallback syncCallback) {
return v8CommandProcessor.sendV8CommandAsync(message, isImmediate,
commandCallback, syncCallback);
}
JavascriptVm getJavascriptVm() {
return javascriptVm;
}
public Version getVmVersion() {
return vmVersion;
}
/**
* @return the DebugEventListener associated with this context
*/
public DebugEventListener getDebugEventListener() {
return getSessionManager().getDebugEventListener();
}
public BreakpointManager getBreakpointManager() {
return breakpointManager;
}
public ScriptManagerProxy getScriptManagerProxy() {
return scriptManagerProxy;
}
public ContextBuilder getContextBuilder() {
return contextBuilder;
}
/**
* Drops current context and creates a new one. This is useful if context is known to have changed
* (e.g. experimental feature LiveEdit may change current stack while execution is suspended).
* The method is asynchronous and returns immediately.
* Does nothing if currently there is no active context. Otherwise dismisses current context,
* invokes {@link DebugEventListener#resumed()} and initiates downloading stack frame descriptions
* and building new context. When the context is built,
* calls {@link DebugEventListener#suspended(DebugContext)}.
* <p>
* Must be called from Dispatch Thread.
* @return true if context has been actually dropped.
*/
public boolean recreateCurrentContext() {
ContextBuilder.ExpectingBacktraceStep step = contextBuilder.startRebuildCurrentContext();
if (step == null) {
return false;
}
defaultResponseHandler.getBreakpointProcessor().processNextStep(step);
return true;
}
public void suspend(final SuspendCallback suspendCallback) {
V8CommandProcessor.V8HandlerCallback v8Callback = new V8CommandCallbackBase() {
@Override
public void failure(String message) {
if (suspendCallback != null) {
suspendCallback.failure(new Exception(message));
}
}
@Override
public void success(SuccessCommandResponse successResponse) {
if (suspendCallback != null) {
suspendCallback.success();
}
ContextBuilder.ExpectingBreakEventStep step1 = contextBuilder.buildNewContextWhenIdle();
if (step1 == null) {
return;
}
ContextBuilder.ExpectingBacktraceStep step2 =
step1.setContextState(Collections.<Breakpoint>emptyList(), null);
defaultResponseHandler.getBreakpointProcessor().processNextStep(step2);
}
};
sendMessageAsync(DebuggerMessageFactory.suspend(), true, v8Callback, null);
}
/**
* A proxy to script manager that makes sure that all scripts have been pre-loaded from remote.
* This is done only once per debug session.
* TODO: consider loading all scripts synchronously on session start.
*/
public static class ScriptManagerProxy {
private final DebugSession debugSession;
private final AsyncFutureRef<Void> scriptsLoadedFuture = new AsyncFutureRef<Void>();
ScriptManagerProxy(DebugSession debugSession) {
this.debugSession = debugSession;
}
public RelayOk getAllScripts(final ScriptsCallback callback, SyncCallback syncCallback) {
if (!scriptsLoadedFuture.isInitialized()) {
scriptsLoadedFuture.initializeRunning(new ScriptsRequester());
}
// Operation is multi-step, so make sure that syncCallback won't be left uncalled.
RelaySyncCallback relay = new RelaySyncCallback(syncCallback);
final RelaySyncCallback.Guard guard = relay.newGuard();
Callback<Void> futureCallback = new Callback<Void>() {
@Override public void done(Void res) {
if (callback != null) {
RelayOk relayOk = getAllScriptsAsync(callback, guard.getRelay());
guard.discharge(relayOk);
}
}
};
return scriptsLoadedFuture.getAsync(futureCallback, guard.asSyncCallback());
}
private RelayOk getAllScriptsAsync(final ScriptsCallback callback, RelaySyncCallback relay) {
// We should call the callback from Dispatch thread (so that the whole collection
// kept fresh during the call-back).
return debugSession.getV8CommandProcessor().runInDispatchThread(
new Runnable() {
@Override
public void run() {
callback.success(debugSession.getScriptManager().allScripts());
}
},
relay.getUserSyncCallback());
}
private class ScriptsRequester implements AsyncFuture.Operation<Void> {
@Override
public RelayOk start(final Callback<Void> requestCallback,
SyncCallback syncCallback) {
V8Helper.ScriptLoadCallback scriptLoadCallback = new V8Helper.ScriptLoadCallback() {
@Override
public void success() {
requestCallback.done(null);
}
@Override
public void failure(final String message) {
LOGGER.log(Level.SEVERE, null,
new Exception("Failed to load scripts from remote: " + message));
requestCallback.done(null);
}
};
return V8Helper.reloadAllScriptsAsync(debugSession, scriptLoadCallback, syncCallback);
}
}
}
/**
* Checks version of V8 and check if it in running state.
*/
public void startCommunication() throws MethodIsBlockingException {
V8BlockingCallback<Void> callback = new V8BlockingCallback<Void>() {
@Override
public Void messageReceived(CommandResponse response) {
SuccessCommandResponse successResponse = response.asSuccess();
if (successResponse == null) {
return null;
}
Version vmVersion = V8ProtocolUtil.parseVersionResponse(successResponse);
DebugSession.this.vmVersion = vmVersion;
if (V8VersionFeatures.isRunningAccurate(vmVersion)) {
Boolean running = successResponse.running();
if (running == Boolean.FALSE) {
ContextBuilder.ExpectingBreakEventStep step1 = contextBuilder.buildNewContextWhenIdle();
// If step is not null -- we are already in process of building a context.
if (step1 != null) {
ContextBuilder.ExpectingBacktraceStep step2 =
step1.setContextState(Collections.<Breakpoint>emptyList(), null);
defaultResponseHandler.getBreakpointProcessor().processNextStep(step2);
}
}
}
return null;
}
@Override
protected Void handleSuccessfulResponse(SuccessCommandResponse response) {
throw new UnsupportedOperationException();
}
};
V8Helper.callV8Sync(this.v8CommandProcessor, DebuggerMessageFactory.version(), callback);
}
public RelayOk sendLoopbackMessage(Runnable callback, SyncCallback syncCallback) {
return this.v8CommandProcessor.runInDispatchThread(callback, syncCallback);
}
public void maybeRethrowContextException(ContextDismissedCheckedException e) {
// TODO(peter.rybin): make some kind of option out of this
final boolean strictPolicy = true;
if (strictPolicy) {
throw new InvalidContextException(e);
}
}
}