gecko/toolkit/devtools/server/main.js
Dave Camp 85a97695bf Bug 877300 - Add a basic DOM walker actor. r=jwalker
--HG--
extra : rebase_source : 984ca53aba9223f1d7c716a394cef2fc72bf8438
2013-06-06 16:09:16 -07:00

902 lines
27 KiB
JavaScript

/* -*- Mode: javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
/**
* Toolkit glue for the remote debugging protocol, loaded into the
* debugging global.
*/
const Ci = Components.interfaces;
const Cc = Components.classes;
const CC = Components.Constructor;
const Cu = Components.utils;
const Cr = Components.results;
const DBG_STRINGS_URI = "chrome://global/locale/devtools/debugger.properties";
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
let wantLogging = Services.prefs.getBoolPref("devtools.debugger.log");
Cu.import("resource://gre/modules/jsdebugger.jsm");
addDebuggerToGlobal(this);
Cu.import("resource://gre/modules/commonjs/sdk/core/promise.js");
const { defer, resolve, reject, all } = Promise;
Cu.import("resource://gre/modules/devtools/SourceMap.jsm");
loadSubScript.call(this, "resource://gre/modules/devtools/DevToolsUtils.js");
function dumpn(str) {
if (wantLogging) {
dump("DBG-SERVER: " + str + "\n");
}
}
function dbg_assert(cond, e) {
if (!cond) {
return e;
}
}
loadSubScript.call(this, "resource://gre/modules/devtools/server/transport.js");
// XPCOM constructors
const ServerSocket = CC("@mozilla.org/network/server-socket;1",
"nsIServerSocket",
"initSpecialConnection");
var gRegisteredModules = Object.create(null);
/**
* The ModuleAPI object is passed to modules loaded using the
* DebuggerServer.registerModule() API. Modules can use this
* object to register actor factories.
* Factories registered through the module API will be removed
* when the module is unregistered or when the server is
* destroyed.
*/
function ModuleAPI() {
let activeTabActors = new Set();
let activeGlobalActors = new Set();
return {
// See DebuggerServer.addGlobalActor for a description.
addGlobalActor: function(factory, name) {
DebuggerServer.addGlobalActor(factory, name);
activeGlobalActors.add(factory);
},
// See DebuggerServer.removeGlobalActor for a description.
removeGlobalActor: function(factory) {
DebuggerServer.removeGlobalActor(factory);
activeGlobalActors.delete(factory);
},
// See DebuggerServer.addTabActor for a description.
addTabActor: function(factory, name) {
DebuggerServer.addTabActor(factory, name);
activeTabActors.add(factory);
},
// See DebuggerServer.removeTabActor for a description.
removeTabActor: function(factory) {
DebuggerServer.removeTabActor(factory);
activeTabActors.delete(factory);
},
// Destroy the module API object, unregistering any
// factories registered by the module.
destroy: function() {
for (let factory of activeTabActors) {
DebuggerServer.removeTabActor(factory);
}
activeTabActors = null;
for (let factory of activeGlobalActors) {
DebuggerServer.removeGlobalActor(factory);
}
activeGlobalActors = null;
}
}
};
/***
* Public API
*/
var DebuggerServer = {
_listener: null,
_initialized: false,
_transportInitialized: false,
xpcInspector: null,
// Number of currently open TCP connections.
_socketConnections: 0,
// Map of global actor names to actor constructors provided by extensions.
globalActorFactories: {},
// Map of tab actor names to actor constructors provided by extensions.
tabActorFactories: {},
LONG_STRING_LENGTH: 10000,
LONG_STRING_INITIAL_LENGTH: 1000,
LONG_STRING_READ_LENGTH: 1000,
/**
* A handler function that prompts the user to accept or decline the incoming
* connection.
*/
_allowConnection: null,
/**
* Prompt the user to accept or decline the incoming connection. This is the
* default implementation that products embedding the debugger server may
* choose to override.
*
* @return true if the connection should be permitted, false otherwise
*/
_defaultAllowConnection: function DS__defaultAllowConnection() {
let title = L10N.getStr("remoteIncomingPromptTitle");
let msg = L10N.getStr("remoteIncomingPromptMessage");
let disableButton = L10N.getStr("remoteIncomingPromptDisable");
let prompt = Services.prompt;
let flags = prompt.BUTTON_POS_0 * prompt.BUTTON_TITLE_OK +
prompt.BUTTON_POS_1 * prompt.BUTTON_TITLE_CANCEL +
prompt.BUTTON_POS_2 * prompt.BUTTON_TITLE_IS_STRING +
prompt.BUTTON_POS_1_DEFAULT;
let result = prompt.confirmEx(null, title, msg, flags, null, null,
disableButton, null, { value: false });
if (result == 0) {
return true;
}
if (result == 2) {
DebuggerServer.closeListener(true);
Services.prefs.setBoolPref("devtools.debugger.remote-enabled", false);
}
return false;
},
/**
* Initialize the debugger server.
*
* @param function aAllowConnectionCallback
* The embedder-provider callback, that decides whether an incoming
* remote protocol conection should be allowed or refused.
*/
init: function DS_init(aAllowConnectionCallback) {
if (this.initialized) {
return;
}
this.xpcInspector = Cc["@mozilla.org/jsinspector;1"].getService(Ci.nsIJSInspector);
this.initTransport(aAllowConnectionCallback);
this.addActors("resource://gre/modules/devtools/server/actors/root.js");
this._initialized = true;
},
/**
* Initialize the debugger server's transport variables. This can be
* in place of init() for cases where the jsdebugger isn't needed.
*
* @param function aAllowConnectionCallback
* The embedder-provider callback, that decides whether an incoming
* remote protocol conection should be allowed or refused.
*/
initTransport: function DS_initTransport(aAllowConnectionCallback) {
if (this._transportInitialized) {
return;
}
this._connections = {};
this._nextConnID = 0;
this._transportInitialized = true;
this._allowConnection = aAllowConnectionCallback ?
aAllowConnectionCallback :
this._defaultAllowConnection;
},
get initialized() this._initialized,
/**
* Performs cleanup tasks before shutting down the debugger server, if no
* connections are currently open. Such tasks include clearing any actor
* constructors added at runtime. This method should be called whenever a
* debugger server is no longer useful, to avoid memory leaks. After this
* method returns, the debugger server must be initialized again before use.
*/
destroy: function DS_destroy() {
if (!this._initialized) {
return;
}
for (let connID of Object.getOwnPropertyNames(this._connections)) {
this._connections[connID].close();
}
for (let id of Object.getOwnPropertyNames(gRegisteredModules)) {
let mod = gRegisteredModules[id];
mod.module.unregister(mod.api);
}
gRegisteredModules = {};
this.closeListener();
this.globalActorFactories = {};
this.tabActorFactories = {};
delete this._allowConnection;
this._transportInitialized = false;
this._initialized = false;
dumpn("Debugger server is shut down.");
},
/**
* Load a subscript into the debugging global.
*
* @param aURL string A url that will be loaded as a subscript into the
* debugging global. The user must load at least one script
* that implements a createRootActor() function to create the
* server's root actor.
*/
addActors: function DS_addActors(aURL) {
loadSubScript.call(this, aURL);
},
/**
* Register a CommonJS module with the debugger server.
* @param id string
* The ID of a CommonJS module. This module must export
* 'register' and 'unregister' functions.
*/
registerModule: function(id) {
if (id in gRegisteredModules) {
throw new Error("Tried to register a module twice: " + id + "\n");
}
let moduleAPI = ModuleAPI();
let {devtools} = Cu.import("resource://gre/modules/devtools/Loader.jsm", {});
let mod = devtools.require(id);
mod.register(moduleAPI);
gRegisteredModules[id] = { module: mod, api: moduleAPI };
},
/**
* Returns true if a module id has been registered.
*/
isModuleRegistered: function(id) {
return (id in gRegisteredModules);
},
/**
* Unregister a previously-loaded CommonJS module from the debugger server.
*/
unregisterModule: function(id) {
let mod = gRegisteredModules[id];
if (!mod) {
throw new Error("Tried to unregister a module that was not previously registered.");
}
mod.module.unregister(mod.api);
mod.api.destroy();
delete gRegisteredModules[id];
},
/**
* Install Firefox-specific actors.
*/
addBrowserActors: function DS_addBrowserActors() {
this.addActors("resource://gre/modules/devtools/server/actors/webbrowser.js");
this.addActors("resource://gre/modules/devtools/server/actors/script.js");
this.addGlobalActor(this.ChromeDebuggerActor, "chromeDebugger");
this.addActors("resource://gre/modules/devtools/server/actors/webconsole.js");
this.addActors("resource://gre/modules/devtools/server/actors/gcli.js");
if ("nsIProfiler" in Ci)
this.addActors("resource://gre/modules/devtools/server/actors/profiler.js");
this.addActors("resource://gre/modules/devtools/server/actors/styleeditor.js");
this.addActors("resource://gre/modules/devtools/server/actors/webapps.js");
this.registerModule("devtools/server/actors/inspector");
},
/**
* Listens on the given port for remote debugger connections.
*
* @param aPort int
* The port to listen on.
*/
openListener: function DS_openListener(aPort) {
if (!Services.prefs.getBoolPref("devtools.debugger.remote-enabled")) {
return false;
}
this._checkInit();
// Return early if the server is already listening.
if (this._listener) {
return true;
}
let flags = Ci.nsIServerSocket.KeepWhenOffline;
// A preference setting can force binding on the loopback interface.
if (Services.prefs.getBoolPref("devtools.debugger.force-local")) {
flags |= Ci.nsIServerSocket.LoopbackOnly;
}
try {
let socket = new ServerSocket(aPort, flags, 4);
socket.asyncListen(this);
this._listener = socket;
} catch (e) {
dumpn("Could not start debugging listener on port " + aPort + ": " + e);
throw Cr.NS_ERROR_NOT_AVAILABLE;
}
this._socketConnections++;
return true;
},
/**
* Close a previously-opened TCP listener.
*
* @param aForce boolean [optional]
* If set to true, then the socket will be closed, regardless of the
* number of open connections.
*/
closeListener: function DS_closeListener(aForce) {
if (!this._listener || this._socketConnections == 0) {
return false;
}
// Only close the listener when the last connection is closed, or if the
// aForce flag is passed.
if (--this._socketConnections == 0 || aForce) {
this._listener.close();
this._listener = null;
this._socketConnections = 0;
}
return true;
},
/**
* Creates a new connection to the local debugger speaking over a fake
* transport. This connection results in straightforward calls to the onPacket
* handlers of each side.
*
* @returns a client-side DebuggerTransport for communicating with
* the newly-created connection.
*/
connectPipe: function DS_connectPipe() {
this._checkInit();
let serverTransport = new LocalDebuggerTransport;
let clientTransport = new LocalDebuggerTransport(serverTransport);
serverTransport.other = clientTransport;
let connection = this._onConnection(serverTransport);
// I'm putting this here because I trust you.
//
// There are times, when using a local connection, when you're going
// to be tempted to just get direct access to the server. Resist that
// temptation! If you succumb to that temptation, you will make the
// fine developers that work on Fennec and Firefox OS sad. They're
// professionals, they'll try to act like they understand, but deep
// down you'll know that you hurt them.
//
// This reference allows you to give in to that temptation. There are
// times this makes sense: tests, for example, and while porting a
// previously local-only codebase to the remote protocol.
//
// But every time you use this, you will feel the shame of having
// used a property that starts with a '_'.
clientTransport._serverConnection = connection;
return clientTransport;
},
// nsIServerSocketListener implementation
onSocketAccepted:
makeInfallible(function DS_onSocketAccepted(aSocket, aTransport) {
if (!this._allowConnection()) {
return;
}
dumpn("New debugging connection on " + aTransport.host + ":" + aTransport.port);
let input = aTransport.openInputStream(0, 0, 0);
let output = aTransport.openOutputStream(0, 0, 0);
let transport = new DebuggerTransport(input, output);
DebuggerServer._onConnection(transport);
}, "DebuggerServer.onSocketAccepted"),
onStopListening: function DS_onStopListening(aSocket, status) {
dumpn("onStopListening, status: " + status);
},
/**
* Raises an exception if the server has not been properly initialized.
*/
_checkInit: function DS_checkInit() {
if (!this._transportInitialized) {
throw "DebuggerServer has not been initialized.";
}
if (!this.createRootActor) {
throw "Use DebuggerServer.addActors() to add a root actor implementation.";
}
},
/**
* Create a new debugger connection for the given transport. Called
* after connectPipe() or after an incoming socket connection.
*/
_onConnection: function DS_onConnection(aTransport) {
let connID = "conn" + this._nextConnID++ + '.';
let conn = new DebuggerServerConnection(connID, aTransport);
this._connections[connID] = conn;
// Create a root actor for the connection and send the hello packet.
conn.rootActor = this.createRootActor(conn);
conn.addActor(conn.rootActor);
aTransport.send(conn.rootActor.sayHello());
aTransport.ready();
return conn;
},
/**
* Remove the connection from the debugging server.
*/
_connectionClosed: function DS_connectionClosed(aConnection) {
delete this._connections[aConnection.prefix];
},
// DebuggerServer extension API.
/**
* Registers handlers for new tab-scoped request types defined dynamically.
* This is used for example by add-ons to augment the functionality of the tab
* actor. Note that the name or actorPrefix of the request type is not allowed
* to clash with existing protocol packet properties, like 'title', 'url' or
* 'actor', since that would break the protocol.
*
* @param aFunction function
* The constructor function for this request type. This expects to be
* called as a constructor (i.e. with 'new'), and passed two
* arguments: the DebuggerServerConnection, and the BrowserTabActor
* with which it will be associated.
*
* @param aName string [optional]
* The name of the new request type. If this is not present, the
* actorPrefix property of the constructor prototype is used.
*/
addTabActor: function DS_addTabActor(aFunction, aName) {
let name = aName ? aName : aFunction.prototype.actorPrefix;
if (["title", "url", "actor"].indexOf(name) != -1) {
throw Error(name + " is not allowed");
}
if (DebuggerServer.tabActorFactories.hasOwnProperty(name)) {
throw Error(name + " already exists");
}
DebuggerServer.tabActorFactories[name] = aFunction;
},
/**
* Unregisters the handler for the specified tab-scoped request type.
* This may be used for example by add-ons when shutting down or upgrading.
*
* @param aFunction function
* The constructor function for this request type.
*/
removeTabActor: function DS_removeTabActor(aFunction) {
for (let name in DebuggerServer.tabActorFactories) {
let handler = DebuggerServer.tabActorFactories[name];
if (handler.name == aFunction.name) {
delete DebuggerServer.tabActorFactories[name];
}
}
},
/**
* Registers handlers for new browser-scoped request types defined
* dynamically. This is used for example by add-ons to augment the
* functionality of the root actor. Note that the name or actorPrefix of the
* request type is not allowed to clash with existing protocol packet
* properties, like 'from', 'tabs' or 'selected', since that would break the
* protocol.
*
* @param aFunction function
* The constructor function for this request type. This expects to be
* called as a constructor (i.e. with 'new'), and passed two
* arguments: the DebuggerServerConnection, and the BrowserRootActor
* with which it will be associated.
*
* @param aName string [optional]
* The name of the new request type. If this is not present, the
* actorPrefix property of the constructor prototype is used.
*/
addGlobalActor: function DS_addGlobalActor(aFunction, aName) {
let name = aName ? aName : aFunction.prototype.actorPrefix;
if (["from", "tabs", "selected"].indexOf(name) != -1) {
throw Error(name + " is not allowed");
}
if (DebuggerServer.globalActorFactories.hasOwnProperty(name)) {
throw Error(name + " already exists");
}
DebuggerServer.globalActorFactories[name] = aFunction;
},
/**
* Unregisters the handler for the specified browser-scoped request type.
* This may be used for example by add-ons when shutting down or upgrading.
*
* @param aFunction function
* The constructor function for this request type.
*/
removeGlobalActor: function DS_removeGlobalActor(aFunction) {
for (let name in DebuggerServer.globalActorFactories) {
let handler = DebuggerServer.globalActorFactories[name];
if (handler.name == aFunction.name) {
delete DebuggerServer.globalActorFactories[name];
}
}
}
};
/**
* Construct an ActorPool.
*
* ActorPools are actorID -> actor mapping and storage. These are
* used to accumulate and quickly dispose of groups of actors that
* share a lifetime.
*/
function ActorPool(aConnection)
{
this.conn = aConnection;
this._cleanups = {};
this._actors = {};
}
ActorPool.prototype = {
/**
* Add an actor to the actor pool. If the actor doesn't have an ID,
* allocate one from the connection.
*
* @param aActor object
* The actor implementation. If the object has a
* 'disconnect' property, it will be called when the actor
* pool is cleaned up.
*/
addActor: function AP_addActor(aActor) {
aActor.conn = this.conn;
if (!aActor.actorID) {
let prefix = aActor.actorPrefix;
if (typeof aActor == "function") {
prefix = aActor.prototype.actorPrefix;
}
aActor.actorID = this.conn.allocID(prefix || undefined);
}
if (aActor.registeredPool) {
aActor.registeredPool.removeActor(aActor);
}
aActor.registeredPool = this;
this._actors[aActor.actorID] = aActor;
if (aActor.disconnect) {
this._cleanups[aActor.actorID] = aActor;
}
},
get: function AP_get(aActorID) {
return this._actors[aActorID];
},
has: function AP_has(aActorID) {
return aActorID in this._actors;
},
/**
* Returns true if the pool is empty.
*/
isEmpty: function AP_isEmpty() {
return Object.keys(this._actors).length == 0;
},
/**
* Remove an actor from the actor pool.
*/
removeActor: function AP_remove(aActor) {
delete this._actors[aActor.actorID];
delete this._cleanups[aActor.actorID];
},
/**
* Match the api expected by the protocol library.
*/
unmanage: function(aActor) {
return this.removeActor(aActor);
},
/**
* Run all actor cleanups.
*/
cleanup: function AP_cleanup() {
for each (let actor in this._cleanups) {
actor.disconnect();
}
this._cleanups = {};
}
}
/**
* Creates a DebuggerServerConnection.
*
* Represents a connection to this debugging global from a client.
* Manages a set of actors and actor pools, allocates actor ids, and
* handles incoming requests.
*
* @param aPrefix string
* All actor IDs created by this connection should be prefixed
* with aPrefix.
* @param aTransport transport
* Packet transport for the debugging protocol.
*/
function DebuggerServerConnection(aPrefix, aTransport)
{
this._prefix = aPrefix;
this._transport = aTransport;
this._transport.hooks = this;
this._nextID = 1;
this._actorPool = new ActorPool(this);
this._extraPools = [];
}
DebuggerServerConnection.prototype = {
_prefix: null,
get prefix() { return this._prefix },
_transport: null,
get transport() { return this._transport },
close: function() {
this._transport.close();
},
send: function DSC_send(aPacket) {
this.transport.send(aPacket);
},
allocID: function DSC_allocID(aPrefix) {
return this.prefix + (aPrefix || '') + this._nextID++;
},
/**
* Add a map of actor IDs to the connection.
*/
addActorPool: function DSC_addActorPool(aActorPool) {
this._extraPools.push(aActorPool);
},
/**
* Remove a previously-added pool of actors to the connection.
*
* @param ActorPool aActorPool
* The ActorPool instance you want to remove.
* @param boolean aCleanup
* True if you want to disconnect each actor from the pool, false
* otherwise.
*/
removeActorPool: function DSC_removeActorPool(aActorPool, aCleanup) {
let index = this._extraPools.lastIndexOf(aActorPool);
if (index > -1) {
let pool = this._extraPools.splice(index, 1);
if (aCleanup) {
pool.map(function(p) { p.cleanup(); });
}
}
},
/**
* Add an actor to the default actor pool for this connection.
*/
addActor: function DSC_addActor(aActor) {
this._actorPool.addActor(aActor);
},
/**
* Remove an actor to the default actor pool for this connection.
*/
removeActor: function DSC_removeActor(aActor) {
this._actorPool.removeActor(aActor);
},
/**
* Match the api expected by the protocol library.
*/
unmanage: function(aActor) {
return this.removeActor(aActor);
},
/**
* Look up an actor implementation for an actorID. Will search
* all the actor pools registered with the connection.
*
* @param aActorID string
* Actor ID to look up.
*/
getActor: function DSC_getActor(aActorID) {
let pool = this.poolFor(aActorID);
if (pool) {
return pool.get(aActorID);
}
if (aActorID === "root") {
return this.rootActor;
}
return null;
},
poolFor: function DSC_actorPool(aActorID) {
if (this._actorPool && this._actorPool.has(aActorID)) {
return this._actorPool;
}
for (let pool of this._extraPools) {
if (pool.has(aActorID)) {
return pool;
}
}
return null;
},
_unknownError: function DSC__unknownError(aPrefix, aError) {
let errorString = safeErrorString(aError);
errorString += "\n" + aError.stack;
Cu.reportError(errorString);
dumpn(errorString);
return {
error: "unknownError",
message: (aPrefix + "': " + errorString)
};
},
// Transport hooks.
/**
* Called by DebuggerTransport to dispatch incoming packets as appropriate.
*
* @param aPacket object
* The incoming packet.
*/
onPacket: function DSC_onPacket(aPacket) {
let actor = this.getActor(aPacket.to);
if (!actor) {
this.transport.send({ from: aPacket.to ? aPacket.to : "root",
error: "noSuchActor" });
return;
}
// Dyamically-loaded actors have to be created lazily.
if (typeof actor == "function") {
let instance;
try {
instance = new actor();
} catch (e) {
this.transport.send(this._unknownError(
"Error occurred while creating actor '" + actor.name,
e));
}
instance.parentID = actor.parentID;
// We want the newly-constructed actor to completely replace the factory
// actor. Reusing the existing actor ID will make sure ActorPool.addActor
// does the right thing.
instance.actorID = actor.actorID;
actor.registeredPool.addActor(instance);
actor = instance;
}
var ret = null;
// Dispatch the request to the actor.
if (actor.requestTypes && actor.requestTypes[aPacket.type]) {
try {
this.currentPacket = aPacket;
ret = actor.requestTypes[aPacket.type].bind(actor)(aPacket, this);
} catch(e) {
this.transport.send(this._unknownError(
"error occurred while processing '" + aPacket.type,
e));
} finally {
delete this.currentPacket;
}
} else {
ret = { error: "unrecognizedPacketType",
message: ('Actor "' + actor.actorID +
'" does not recognize the packet type "' +
aPacket.type + '"') };
}
if (!ret) {
// This should become an error once we've converted every user
// of this to promises in bug 794078.
return;
}
resolve(ret)
.then(null, (e) => {
return this._unknownError(
"error occurred while processing '" + aPacket.type,
e);
})
.then(function (aResponse) {
if (!aResponse.from) {
aResponse.from = aPacket.to;
}
return aResponse;
})
.then(this.transport.send.bind(this.transport));
},
/**
* Called by DebuggerTransport when the underlying stream is closed.
*
* @param aStatus nsresult
* The status code that corresponds to the reason for closing
* the stream.
*/
onClosed: function DSC_onClosed(aStatus) {
dumpn("Cleaning up connection.");
this._actorPool.cleanup();
this._actorPool = null;
this._extraPools.map(function(p) { p.cleanup(); });
this._extraPools = null;
DebuggerServer._connectionClosed(this);
},
/*
* Debugging helper for inspecting the state of the actor pools.
*/
_dumpPools: function DSC_dumpPools() {
dumpn("/-------------------- dumping pools:");
if (this._actorPool) {
dumpn("--------------------- actorPool actors: " +
uneval(Object.keys(this._actorPool._actors)));
}
for each (let pool in this._extraPools)
dumpn("--------------------- extraPool actors: " +
uneval(Object.keys(pool._actors)));
},
/*
* Debugging helper for inspecting the state of an actor pool.
*/
_dumpPool: function DSC_dumpPools(aPool) {
dumpn("/-------------------- dumping pool:");
dumpn("--------------------- actorPool actors: " +
uneval(Object.keys(aPool._actors)));
}
};
/**
* Localization convenience methods.
*/
let L10N = {
/**
* L10N shortcut function.
*
* @param string aName
* @return string
*/
getStr: function L10N_getStr(aName) {
return this.stringBundle.GetStringFromName(aName);
}
};
XPCOMUtils.defineLazyGetter(L10N, "stringBundle", function() {
return Services.strings.createBundle(DBG_STRINGS_URI);
});