зеркало из https://github.com/mozilla/gecko-dev.git
621 строка
20 KiB
Plaintext
621 строка
20 KiB
Plaintext
/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* 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/. */
|
|
|
|
interface nsIEventTarget;
|
|
interface Principal;
|
|
|
|
/**
|
|
* Message managers provide a way for chrome-privileged JS code to
|
|
* communicate with each other, even across process boundaries.
|
|
*
|
|
* Message managers are separated into "parent side" and "child side".
|
|
* These don't always correspond to process boundaries, but can. For
|
|
* each child-side message manager, there is always exactly one
|
|
* corresponding parent-side message manager that it sends messages
|
|
* to. However, for each parent-side message manager, there may be
|
|
* either one or many child-side managers it can message.
|
|
*
|
|
* Message managers that always have exactly one "other side" are of
|
|
* type MessageSender. Parent-side message managers that have many
|
|
* "other sides" are of type MessageBroadcaster.
|
|
*
|
|
* Child-side message managers can send synchronous messages to their
|
|
* parent side, but not the other way around.
|
|
*
|
|
* There are two realms of message manager hierarchies. One realm
|
|
* approximately corresponds to DOM elements, the other corresponds to
|
|
* process boundaries.
|
|
*
|
|
* Message managers corresponding to DOM elements
|
|
* ==============================================
|
|
*
|
|
* In this realm of message managers, there are
|
|
* - "frame message managers" which correspond to frame elements
|
|
* - "window message managers" which correspond to top-level chrome
|
|
* windows
|
|
* - "group message managers" which correspond to named message
|
|
* managers with a specific window MM as the parent
|
|
* - the "global message manager", on the parent side. See below.
|
|
*
|
|
* The DOM-realm message managers can communicate in the ways shown by
|
|
* the following diagram. The parent side and child side can
|
|
* correspond to process boundaries, but don't always.
|
|
*
|
|
* Parent side Child side
|
|
* ------------- ------------
|
|
* global MMg
|
|
* |
|
|
* +-->window MMw1
|
|
* | |
|
|
* | +-->frame MMp1_1<------------>frame MMc1_1
|
|
* | |
|
|
* | +-->frame MMp1_2<------------>frame MMc1_2
|
|
* | |
|
|
* | +-->group MMgr1
|
|
* | | |
|
|
* | | +-->frame MMp2_1<------->frame MMc2_1
|
|
* | | |
|
|
* | | +-->frame MMp2_2<------->frame MMc2_2
|
|
* | |
|
|
* | +-->group MMgr2
|
|
* | | ...
|
|
* | |
|
|
* | ...
|
|
* |
|
|
* +-->window MMw2
|
|
* ...
|
|
*
|
|
* For example: a message sent from MMc1_1, from the child side, is
|
|
* sent only to MMp1_1 on the parent side. However, note that all
|
|
* message managers in the hierarchy above MMp1_1, in this diagram
|
|
* MMw1 and MMg, will also notify their message listeners when the
|
|
* message arrives.
|
|
*
|
|
* A message sent from MMc2_1 will be sent to MMp2_1 and also notify
|
|
* all message managers in the hierarchy above that, including the
|
|
* group message manager MMgr1.
|
|
|
|
* For example: a message broadcast through the global MMg on the
|
|
* parent side would be broadcast to MMw1, which would transitively
|
|
* broadcast it to MMp1_1, MM1p_2. The message would next be
|
|
* broadcast to MMgr1, which would broadcast it to MMp2_1 and MMp2_2.
|
|
* After that it would broadcast to MMgr2 and then to MMw2, and so
|
|
* on down the hierarchy.
|
|
*
|
|
* ***** PERFORMANCE AND SECURITY WARNING *****
|
|
* Messages broadcast through the global MM and window or group MMs
|
|
* can result in messages being dispatched across many OS processes,
|
|
* and to many processes with different permissions. Great care
|
|
* should be taken when broadcasting.
|
|
*
|
|
* Interfaces
|
|
* ----------
|
|
*
|
|
* The global MMg and window MMw's are message broadcasters implementing
|
|
* MessageBroadcaster while the frame MMp's are simple message senders (MessageSender).
|
|
* Their counterparts in the content processes are message senders implementing
|
|
* ContentFrameMessageManager.
|
|
*
|
|
* MessageListenerManager
|
|
* / \
|
|
* MessageSender MessageBroadcaster
|
|
* |
|
|
* SyncMessageSender (content process/in-process only)
|
|
* |
|
|
* ContentFrameMessageManager (content process/in-process only)
|
|
* |
|
|
* nsIInProcessContentFrameMessageManager (in-process only)
|
|
*
|
|
*
|
|
* Message managers in the chrome process also implement FrameScriptLoader.
|
|
*
|
|
*
|
|
* Message managers corresponding to process boundaries
|
|
* ====================================================
|
|
*
|
|
* The second realm of message managers is the "process message
|
|
* managers". With one exception, these always correspond to process
|
|
* boundaries. The picture looks like
|
|
*
|
|
* Parent process Child processes
|
|
* ---------------- -----------------
|
|
* global (GPPMM)
|
|
* |
|
|
* +-->parent in-process PIPMM<-->child in-process CIPPMM
|
|
* |
|
|
* +-->parent (PPMM1)<------------------>child (CPMM1)
|
|
* |
|
|
* +-->parent (PPMM2)<------------------>child (CPMM2)
|
|
* ...
|
|
*
|
|
* Note, PIPMM and CIPPMM both run in the parent process.
|
|
*
|
|
* For example: the parent-process PPMM1 sends messages to the
|
|
* child-process CPMM1.
|
|
*
|
|
* For example: CPMM1 sends messages directly to PPMM1. The global GPPMM
|
|
* will also notify their message listeners when the message arrives.
|
|
*
|
|
* For example: messages sent through the global GPPMM will be
|
|
* dispatched to the listeners of the same-process, CIPPMM, CPMM1,
|
|
* CPMM2, etc.
|
|
*
|
|
* ***** PERFORMANCE AND SECURITY WARNING *****
|
|
* Messages broadcast through the GPPMM can result in messages
|
|
* being dispatched across many OS processes, and to many processes
|
|
* with different permissions. Great care should be taken when
|
|
* broadcasting.
|
|
*
|
|
* Requests sent to parent-process message listeners should usually
|
|
* have replies scoped to the requesting CPMM. The following pattern
|
|
* is common
|
|
*
|
|
* const ParentProcessListener = {
|
|
* receiveMessage: function(aMessage) {
|
|
* switch (aMessage.name) {
|
|
* case "Foo:Request":
|
|
* // service request
|
|
* aMessage.target.sendAsyncMessage("Foo:Response", { data });
|
|
* }
|
|
* }
|
|
* };
|
|
*/
|
|
|
|
dictionary ReceiveMessageArgument
|
|
{
|
|
/**
|
|
* The target of the message. Either an element owning the message manager, or message
|
|
* manager itself if no element owns it.
|
|
*/
|
|
required nsISupports target;
|
|
|
|
/**
|
|
* Message name.
|
|
*/
|
|
required DOMString name;
|
|
|
|
required boolean sync;
|
|
|
|
/**
|
|
* Structured clone of the sent message data
|
|
*/
|
|
any data = null;
|
|
|
|
/**
|
|
* Same as .data, deprecated.
|
|
*/
|
|
any json = null;
|
|
|
|
/**
|
|
* Named table of jsvals/objects, or null.
|
|
*/
|
|
required object objects;
|
|
|
|
sequence<MessagePort> ports;
|
|
|
|
/**
|
|
* Principal for the window app.
|
|
*/
|
|
required Principal? principal;
|
|
|
|
FrameLoader targetFrameLoader;
|
|
};
|
|
|
|
[Exposed=Window]
|
|
callback interface MessageListener
|
|
{
|
|
/**
|
|
* Each listener is invoked with its own copy of the message
|
|
* parameter.
|
|
*
|
|
* When the listener is called, 'this' value is the target of the message.
|
|
*
|
|
* If the message is synchronous, the possible return value is
|
|
* returned as JSON (will be changed to use structured clones).
|
|
* When there are multiple listeners to sync messages, each
|
|
* listener's return value is sent back as an array. |undefined|
|
|
* return values show up as undefined values in the array.
|
|
*/
|
|
any receiveMessage(ReceiveMessageArgument argument);
|
|
};
|
|
|
|
[ChromeOnly, Exposed=Window]
|
|
interface MessageListenerManager
|
|
{
|
|
// All the methods are pulled in via mixin.
|
|
};
|
|
MessageListenerManager includes MessageListenerManagerMixin;
|
|
|
|
interface mixin MessageListenerManagerMixin
|
|
{
|
|
/**
|
|
* Register |listener| to receive |messageName|. All listener
|
|
* callbacks for a particular message are invoked when that message
|
|
* is received.
|
|
*
|
|
* The message manager holds a strong ref to |listener|.
|
|
*
|
|
* If the same listener registers twice for the same message, the
|
|
* second registration is ignored.
|
|
*
|
|
* Pass true for listenWhenClosed if you want to receive messages
|
|
* during the short period after a frame has been removed from the
|
|
* DOM and before its frame script has finished unloading. This
|
|
* parameter only has an effect for frame message managers in
|
|
* the main process. Default is false.
|
|
*/
|
|
[Throws]
|
|
void addMessageListener(DOMString messageName,
|
|
MessageListener listener,
|
|
optional boolean listenWhenClosed = false);
|
|
|
|
/**
|
|
* Undo an |addMessageListener| call -- that is, calling this causes us to no
|
|
* longer invoke |listener| when |messageName| is received.
|
|
*
|
|
* removeMessageListener does not remove a message listener added via
|
|
* addWeakMessageListener; use removeWeakMessageListener for that.
|
|
*/
|
|
[Throws]
|
|
void removeMessageListener(DOMString messageName,
|
|
MessageListener listener);
|
|
|
|
/**
|
|
* This is just like addMessageListener, except the message manager holds a
|
|
* weak ref to |listener|.
|
|
*
|
|
* If you have two weak message listeners for the same message, they may be
|
|
* called in any order.
|
|
*/
|
|
[Throws]
|
|
void addWeakMessageListener(DOMString messageName,
|
|
MessageListener listener);
|
|
|
|
/**
|
|
* This undoes an |addWeakMessageListener| call.
|
|
*/
|
|
[Throws]
|
|
void removeWeakMessageListener(DOMString messageName,
|
|
MessageListener listener);
|
|
};
|
|
|
|
/**
|
|
* Message "senders" have a single "other side" to which messages are
|
|
* sent. For example, a child-process message manager will send
|
|
* messages that are only delivered to its one parent-process message
|
|
* manager.
|
|
*/
|
|
[ChromeOnly, Exposed=Window]
|
|
interface MessageSender : MessageListenerManager
|
|
{
|
|
// All the methods are pulled in via mixin.
|
|
};
|
|
MessageSender includes MessageSenderMixin;
|
|
|
|
/**
|
|
* Anyone including this MUST also incude MessageListenerManagerMixin.
|
|
*/
|
|
interface mixin MessageSenderMixin {
|
|
/**
|
|
* Send |messageName| and |obj| to the "other side" of this message
|
|
* manager. This invokes listeners who registered for
|
|
* |messageName|.
|
|
*
|
|
* See ReceiveMessageArgument for the format of the data delivered to listeners.
|
|
* @throws NS_ERROR_NOT_INITIALIZED if the sender is not initialized. For
|
|
* example, we will throw NS_ERROR_NOT_INITIALIZED if we try to send
|
|
* a message to a cross-process frame but the other process has not
|
|
* yet been set up.
|
|
* @throws NS_ERROR_FAILURE when the message receiver cannot be found. For
|
|
* example, we will throw NS_ERROR_FAILURE if we try to send a message
|
|
* to a cross-process frame whose process has crashed.
|
|
*/
|
|
[Throws]
|
|
void sendAsyncMessage(optional DOMString? messageName = null,
|
|
optional any obj,
|
|
optional object? objects = null,
|
|
optional Principal? principal = null,
|
|
optional any transfers);
|
|
|
|
/**
|
|
* For remote browsers there is always a corresponding process message
|
|
* manager. The intention of this attribute is to link leaf level frame
|
|
* message managers on the parent side with the corresponding process
|
|
* message managers (if there is one). For any other cases this property
|
|
* is null.
|
|
*/
|
|
[Throws]
|
|
readonly attribute MessageSender? processMessageManager;
|
|
|
|
/**
|
|
* For remote browsers, this contains the remoteType of the content child.
|
|
* Otherwise, it is empty.
|
|
*/
|
|
[Throws]
|
|
readonly attribute DOMString remoteType;
|
|
};
|
|
|
|
[ChromeOnly, Exposed=Window]
|
|
interface SyncMessageSender : MessageSender
|
|
{
|
|
// All the methods are pulled in via mixin.
|
|
};
|
|
SyncMessageSender includes SyncMessageSenderMixin;
|
|
|
|
/**
|
|
* Anyone including this MUST also incude MessageSenderMixin.
|
|
*/
|
|
interface mixin SyncMessageSenderMixin
|
|
{
|
|
/**
|
|
* Like |sendAsyncMessage()|, except blocks the sender until all
|
|
* listeners of the message have been invoked. Returns an array
|
|
* containing return values from each listener invoked.
|
|
*/
|
|
[Throws]
|
|
sequence<any> sendSyncMessage(optional DOMString? messageName = null,
|
|
optional any obj,
|
|
optional object? objects = null,
|
|
optional Principal? principal = null);
|
|
|
|
/**
|
|
* Like |sendSyncMessage()|, except re-entrant. New RPC messages may be
|
|
* issued even if, earlier on the call stack, we are waiting for a reply
|
|
* to an earlier sendRpcMessage() call.
|
|
*
|
|
* Both sendSyncMessage and sendRpcMessage will block until a reply is
|
|
* received, but they may be temporarily interrupted to process an urgent
|
|
* incoming message (such as a CPOW request).
|
|
*/
|
|
[Throws]
|
|
sequence<any> sendRpcMessage(optional DOMString? messageName = null,
|
|
optional any obj,
|
|
optional object? objects = null,
|
|
optional Principal? principal = null);
|
|
};
|
|
|
|
/**
|
|
* ChildProcessMessageManager is used in a child process to communicate with the parent
|
|
* process.
|
|
*/
|
|
[ChromeOnly, Exposed=Window]
|
|
interface ChildProcessMessageManager : SyncMessageSender
|
|
{
|
|
};
|
|
|
|
/**
|
|
* Mixin for message manager globals. Anyone including this MUST also
|
|
* include SyncMessageSenderMixin.
|
|
*/
|
|
interface mixin MessageManagerGlobal
|
|
{
|
|
/**
|
|
* Print a string to stdout.
|
|
*/
|
|
void dump(DOMString str);
|
|
|
|
/**
|
|
* If leak detection is enabled, print a note to the leak log that this
|
|
* process will intentionally crash.
|
|
*/
|
|
[Throws]
|
|
void privateNoteIntentionalCrash();
|
|
|
|
/**
|
|
* Ascii base64 data to binary data and vice versa
|
|
*/
|
|
[Throws]
|
|
DOMString atob(DOMString asciiString);
|
|
[Throws]
|
|
DOMString btoa(DOMString base64Data);
|
|
};
|
|
|
|
interface mixin FrameScriptLoader
|
|
{
|
|
/**
|
|
* Load a script in the (remote) frame. |url| must be the absolute URL.
|
|
* data: URLs are also supported. For example data:,dump("foo\n");
|
|
* If allowDelayedLoad is true, script will be loaded when the
|
|
* remote frame becomes available. Otherwise the script will be loaded
|
|
* only if the frame is already available.
|
|
*/
|
|
[Throws]
|
|
void loadFrameScript(DOMString url, boolean allowDelayedLoad,
|
|
optional boolean runInGlobalScope = false);
|
|
|
|
/**
|
|
* Removes |url| from the list of scripts which support delayed load.
|
|
*/
|
|
void removeDelayedFrameScript(DOMString url);
|
|
|
|
/**
|
|
* Returns all delayed scripts that will be loaded once a (remote)
|
|
* frame becomes available. The return value is a list of pairs
|
|
* [<URL>, <WasLoadedInGlobalScope>].
|
|
*/
|
|
[Throws]
|
|
sequence<sequence<any>> getDelayedFrameScripts();
|
|
};
|
|
|
|
interface mixin ProcessScriptLoader
|
|
{
|
|
/**
|
|
* Load a script in the (possibly remote) process. |url| must be the absolute
|
|
* URL. data: URLs are also supported. For example data:,dump("foo\n");
|
|
* If allowDelayedLoad is true, script will be loaded when the
|
|
* remote frame becomes available. Otherwise the script will be loaded
|
|
* only if the frame is already available.
|
|
*/
|
|
[Throws]
|
|
void loadProcessScript(DOMString url, boolean allowDelayedLoad);
|
|
|
|
/**
|
|
* Removes |url| from the list of scripts which support delayed load.
|
|
*/
|
|
void removeDelayedProcessScript(DOMString url);
|
|
|
|
/**
|
|
* Returns all delayed scripts that will be loaded once a (remote)
|
|
* frame becomes available. The return value is a list of pairs
|
|
* [<URL>, <WasLoadedInGlobalScope>].
|
|
*/
|
|
[Throws]
|
|
sequence<sequence<any>> getDelayedProcessScripts();
|
|
};
|
|
|
|
/**
|
|
* Anyone including GlobalProcessScriptLoader MUST also include ProcessScriptLoader.
|
|
*/
|
|
interface mixin GlobalProcessScriptLoader
|
|
{
|
|
/**
|
|
* Allows the parent process to set the initial process data for
|
|
* new, not-yet-created child processes. This attribute should only
|
|
* be used by the global parent process message manager. When a new
|
|
* process is created, it gets a copy of this data (via structured
|
|
* cloning). It can access the data via the initialProcessData
|
|
* attribute of its childprocessmessagemanager.
|
|
*
|
|
* This value will always be a JS object if it's not null or undefined. Different
|
|
* users are expected to set properties on this object. The property name should be
|
|
* unique enough that other Gecko consumers won't accidentally choose it.
|
|
*/
|
|
[Throws]
|
|
readonly attribute any initialProcessData;
|
|
|
|
readonly attribute MozWritableSharedMap sharedData;
|
|
};
|
|
|
|
[ChromeOnly, Exposed=Window]
|
|
interface ContentFrameMessageManager : EventTarget
|
|
{
|
|
/**
|
|
* The current top level window in the frame or null.
|
|
*/
|
|
[Throws]
|
|
readonly attribute WindowProxy? content;
|
|
|
|
/**
|
|
* The top level docshell or null.
|
|
*/
|
|
[Throws]
|
|
readonly attribute nsIDocShell? docShell;
|
|
|
|
/**
|
|
* Returns the SchedulerEventTarget corresponding to the TabGroup
|
|
* for this frame.
|
|
*/
|
|
readonly attribute nsIEventTarget? tabEventTarget;
|
|
|
|
/**
|
|
* Returns the outerWindowID of the browser window hosting the frame.
|
|
* If, for some reason, the frameloader can't be resolved to a browser
|
|
* window, this will return 0.
|
|
*/
|
|
readonly attribute long long chromeOuterWindowID;
|
|
|
|
};
|
|
ContentFrameMessageManager includes MessageManagerGlobal;
|
|
ContentFrameMessageManager includes SyncMessageSenderMixin;
|
|
ContentFrameMessageManager includes MessageSenderMixin;
|
|
ContentFrameMessageManager includes MessageListenerManagerMixin;
|
|
|
|
[ChromeOnly, Exposed=Window]
|
|
interface ContentProcessMessageManager
|
|
{
|
|
/**
|
|
* Read out a copy of the object that was initialized in the parent
|
|
* process via ProcessScriptLoader.initialProcessData.
|
|
*/
|
|
[Throws]
|
|
readonly attribute any initialProcessData;
|
|
|
|
readonly attribute MozSharedMap sharedData;
|
|
};
|
|
ContentProcessMessageManager includes MessageManagerGlobal;
|
|
ContentProcessMessageManager includes SyncMessageSenderMixin;
|
|
ContentProcessMessageManager includes MessageSenderMixin;
|
|
ContentProcessMessageManager includes MessageListenerManagerMixin;
|
|
|
|
/**
|
|
* Message "broadcasters" don't have a single "other side" that they send messages to, but
|
|
* rather a set of subordinate message managers. For example, broadcasting a message
|
|
* through a window message manager will broadcast the message to all frame message
|
|
* managers within its window.
|
|
*/
|
|
[ChromeOnly, Exposed=Window]
|
|
interface MessageBroadcaster : MessageListenerManager
|
|
{
|
|
/**
|
|
* Like |sendAsyncMessage()|, but also broadcasts this message to
|
|
* all "child" message managers of this message manager. See long
|
|
* comment above for details.
|
|
*
|
|
* WARNING: broadcasting messages can be very expensive and leak
|
|
* sensitive data. Use with extreme caution.
|
|
*/
|
|
[Throws]
|
|
void broadcastAsyncMessage(optional DOMString? messageName = null,
|
|
optional any obj,
|
|
optional object? objects = null);
|
|
|
|
/**
|
|
* Number of subordinate message managers.
|
|
*/
|
|
readonly attribute unsigned long childCount;
|
|
|
|
/**
|
|
* Return a single subordinate message manager.
|
|
*/
|
|
MessageListenerManager? getChildAt(unsigned long aIndex);
|
|
|
|
/**
|
|
* Some processes are kept alive after their last tab/window are closed for testing
|
|
* (see dom.ipc.keepProcessesAlive). This function releases those.
|
|
*/
|
|
void releaseCachedProcesses();
|
|
};
|
|
|
|
/**
|
|
* ChromeMessageBroadcaster is used for window and group message managers.
|
|
*/
|
|
[ChromeOnly, Exposed=Window]
|
|
interface ChromeMessageBroadcaster : MessageBroadcaster
|
|
{
|
|
};
|
|
ChromeMessageBroadcaster includes FrameScriptLoader;
|
|
|
|
/**
|
|
* ParentProcessMessageManager is used in a parent process to communicate with all the
|
|
* child processes.
|
|
*/
|
|
[ChromeOnly, Exposed=Window]
|
|
interface ParentProcessMessageManager : MessageBroadcaster
|
|
{
|
|
};
|
|
ParentProcessMessageManager includes ProcessScriptLoader;
|
|
ParentProcessMessageManager includes GlobalProcessScriptLoader;
|
|
|
|
[ChromeOnly, Exposed=Window]
|
|
interface ChromeMessageSender : MessageSender
|
|
{
|
|
};
|
|
ChromeMessageSender includes FrameScriptLoader;
|
|
|
|
/**
|
|
* ProcessMessageManager is used in a parent process to communicate with a child process
|
|
* (or with the process itself in a single-process scenario).
|
|
*/
|
|
[ChromeOnly, Exposed=Window]
|
|
interface ProcessMessageManager : MessageSender
|
|
{
|
|
// PID of the process being communicated with.
|
|
readonly attribute long osPid;
|
|
|
|
// Whether this is message manager for the current process.
|
|
readonly attribute boolean isInProcess;
|
|
};
|
|
ProcessMessageManager includes ProcessScriptLoader;
|