forked from mirrors/gecko-dev
583 lines
19 KiB
Text
583 lines
19 KiB
Text
/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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interface nsIEventTarget;
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interface Principal;
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/**
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* Message managers provide a way for chrome-privileged JS code to
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* communicate with each other, even across process boundaries.
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*
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* Message managers are separated into "parent side" and "child side".
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* These don't always correspond to process boundaries, but can. For
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* each child-side message manager, there is always exactly one
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* corresponding parent-side message manager that it sends messages
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* to. However, for each parent-side message manager, there may be
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* either one or many child-side managers it can message.
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*
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* Message managers that always have exactly one "other side" are of
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* type MessageSender. Parent-side message managers that have many
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* "other sides" are of type MessageBroadcaster.
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*
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* Child-side message managers can send synchronous messages to their
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* parent side, but not the other way around.
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*
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* There are two realms of message manager hierarchies. One realm
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* approximately corresponds to DOM elements, the other corresponds to
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* process boundaries.
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*
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* Message managers corresponding to DOM elements
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* ==============================================
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*
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* In this realm of message managers, there are
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* - "frame message managers" which correspond to frame elements
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* - "window message managers" which correspond to top-level chrome
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* windows
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* - "group message managers" which correspond to named message
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* managers with a specific window MM as the parent
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* - the "global message manager", on the parent side. See below.
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*
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* The DOM-realm message managers can communicate in the ways shown by
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* the following diagram. The parent side and child side can
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* correspond to process boundaries, but don't always.
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*
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* Parent side Child side
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* ------------- ------------
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* global MMg
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* |
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* +-->window MMw1
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* | |
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* | +-->frame MMp1_1<------------>frame MMc1_1
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* | |
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* | +-->frame MMp1_2<------------>frame MMc1_2
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* | |
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* | +-->group MMgr1
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* | | |
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* | | +-->frame MMp2_1<------->frame MMc2_1
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* | | |
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* | | +-->frame MMp2_2<------->frame MMc2_2
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* | |
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* | +-->group MMgr2
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* | | ...
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* | |
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* | ...
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* |
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* +-->window MMw2
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* ...
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*
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* For example: a message sent from MMc1_1, from the child side, is
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* sent only to MMp1_1 on the parent side. However, note that all
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* message managers in the hierarchy above MMp1_1, in this diagram
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* MMw1 and MMg, will also notify their message listeners when the
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* message arrives.
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*
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* A message sent from MMc2_1 will be sent to MMp2_1 and also notify
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* all message managers in the hierarchy above that, including the
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* group message manager MMgr1.
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* For example: a message broadcast through the global MMg on the
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* parent side would be broadcast to MMw1, which would transitively
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* broadcast it to MMp1_1, MM1p_2. The message would next be
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* broadcast to MMgr1, which would broadcast it to MMp2_1 and MMp2_2.
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* After that it would broadcast to MMgr2 and then to MMw2, and so
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* on down the hierarchy.
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*
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* ***** PERFORMANCE AND SECURITY WARNING *****
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* Messages broadcast through the global MM and window or group MMs
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* can result in messages being dispatched across many OS processes,
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* and to many processes with different permissions. Great care
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* should be taken when broadcasting.
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*
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* Interfaces
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* ----------
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*
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* The global MMg and window MMw's are message broadcasters implementing
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* MessageBroadcaster while the frame MMp's are simple message senders (MessageSender).
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* Their counterparts in the content processes are message senders implementing
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* ContentFrameMessageManager.
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*
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* MessageListenerManager
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* / \
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* MessageSender MessageBroadcaster
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* |
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* SyncMessageSender (content process/in-process only)
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* |
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* ContentFrameMessageManager (content process/in-process only)
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* |
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* nsIInProcessContentFrameMessageManager (in-process only)
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*
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*
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* Message managers in the chrome process also implement FrameScriptLoader.
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*
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*
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* Message managers corresponding to process boundaries
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* ====================================================
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*
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* The second realm of message managers is the "process message
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* managers". With one exception, these always correspond to process
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* boundaries. The picture looks like
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*
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* Parent process Child processes
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* ---------------- -----------------
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* global (GPPMM)
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* |
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* +-->parent in-process PIPMM<-->child in-process CIPPMM
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* |
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* +-->parent (PPMM1)<------------------>child (CPMM1)
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* |
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* +-->parent (PPMM2)<------------------>child (CPMM2)
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* ...
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*
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* Note, PIPMM and CIPPMM both run in the parent process.
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*
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* For example: the parent-process PPMM1 sends messages to the
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* child-process CPMM1.
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*
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* For example: CPMM1 sends messages directly to PPMM1. The global GPPMM
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* will also notify their message listeners when the message arrives.
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*
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* For example: messages sent through the global GPPMM will be
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* dispatched to the listeners of the same-process, CIPPMM, CPMM1,
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* CPMM2, etc.
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*
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* ***** PERFORMANCE AND SECURITY WARNING *****
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* Messages broadcast through the GPPMM can result in messages
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* being dispatched across many OS processes, and to many processes
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* with different permissions. Great care should be taken when
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* broadcasting.
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*
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* Requests sent to parent-process message listeners should usually
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* have replies scoped to the requesting CPMM. The following pattern
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* is common
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*
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* const ParentProcessListener = {
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* receiveMessage: function(aMessage) {
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* switch (aMessage.name) {
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* case "Foo:Request":
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* // service request
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* aMessage.target.sendAsyncMessage("Foo:Response", { data });
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* }
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* }
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* };
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*/
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dictionary ReceiveMessageArgument
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{
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/**
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* The target of the message. Either an element owning the message manager, or message
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* manager itself if no element owns it.
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*/
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required nsISupports target;
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/**
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* Message name.
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*/
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required DOMString name;
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required boolean sync;
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/**
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* Structured clone of the sent message data
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*/
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any data = null;
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/**
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* Same as .data, deprecated.
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*/
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any json = null;
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sequence<MessagePort> ports;
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FrameLoader targetFrameLoader;
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};
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[Exposed=Window]
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callback interface MessageListener
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{
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/**
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* Each listener is invoked with its own copy of the message
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* parameter.
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*
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* When the listener is called, 'this' value is the target of the message.
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*
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* If the message is synchronous, the possible return value is
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* returned as JSON (will be changed to use structured clones).
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* When there are multiple listeners to sync messages, each
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* listener's return value is sent back as an array. |undefined|
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* return values show up as undefined values in the array.
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*/
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any receiveMessage(ReceiveMessageArgument argument);
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};
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[ChromeOnly, Exposed=Window]
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interface MessageListenerManager
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{
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// All the methods are pulled in via mixin.
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};
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MessageListenerManager includes MessageListenerManagerMixin;
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interface mixin MessageListenerManagerMixin
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{
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/**
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* Register |listener| to receive |messageName|. All listener
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* callbacks for a particular message are invoked when that message
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* is received.
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*
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* The message manager holds a strong ref to |listener|.
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*
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* If the same listener registers twice for the same message, the
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* second registration is ignored.
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*
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* Pass true for listenWhenClosed if you want to receive messages
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* during the short period after a frame has been removed from the
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* DOM and before its frame script has finished unloading. This
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* parameter only has an effect for frame message managers in
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* the main process. Default is false.
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*/
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[Throws]
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void addMessageListener(DOMString messageName,
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MessageListener listener,
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optional boolean listenWhenClosed = false);
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/**
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* Undo an |addMessageListener| call -- that is, calling this causes us to no
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* longer invoke |listener| when |messageName| is received.
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*
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* removeMessageListener does not remove a message listener added via
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* addWeakMessageListener; use removeWeakMessageListener for that.
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*/
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[Throws]
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void removeMessageListener(DOMString messageName,
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MessageListener listener);
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/**
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* This is just like addMessageListener, except the message manager holds a
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* weak ref to |listener|.
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*
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* If you have two weak message listeners for the same message, they may be
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* called in any order.
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*/
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[Throws]
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void addWeakMessageListener(DOMString messageName,
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MessageListener listener);
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/**
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* This undoes an |addWeakMessageListener| call.
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*/
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[Throws]
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void removeWeakMessageListener(DOMString messageName,
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MessageListener listener);
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};
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/**
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* Message "senders" have a single "other side" to which messages are
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* sent. For example, a child-process message manager will send
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* messages that are only delivered to its one parent-process message
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* manager.
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*/
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[ChromeOnly, Exposed=Window]
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interface MessageSender : MessageListenerManager
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{
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// All the methods are pulled in via mixin.
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};
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MessageSender includes MessageSenderMixin;
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/**
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* Anyone including this MUST also incude MessageListenerManagerMixin.
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*/
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interface mixin MessageSenderMixin {
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/**
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* Send |messageName| and |obj| to the "other side" of this message
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* manager. This invokes listeners who registered for
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* |messageName|.
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*
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* See ReceiveMessageArgument for the format of the data delivered to listeners.
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* @throws NS_ERROR_NOT_INITIALIZED if the sender is not initialized. For
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* example, we will throw NS_ERROR_NOT_INITIALIZED if we try to send
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* a message to a cross-process frame but the other process has not
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* yet been set up.
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* @throws NS_ERROR_FAILURE when the message receiver cannot be found. For
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* example, we will throw NS_ERROR_FAILURE if we try to send a message
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* to a cross-process frame whose process has crashed.
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*/
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[Throws]
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void sendAsyncMessage(optional DOMString? messageName = null,
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optional any obj,
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optional any transfers);
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/**
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* For remote browsers there is always a corresponding process message
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* manager. The intention of this attribute is to link leaf level frame
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* message managers on the parent side with the corresponding process
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* message managers (if there is one). For any other cases this property
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* is null.
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*/
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[Throws]
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readonly attribute MessageSender? processMessageManager;
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/**
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* For remote browsers, this contains the remoteType of the content child.
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* Otherwise, it is empty.
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*/
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[Throws]
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readonly attribute UTF8String remoteType;
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};
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[ChromeOnly, Exposed=Window]
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interface SyncMessageSender : MessageSender
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{
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// All the methods are pulled in via mixin.
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};
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SyncMessageSender includes SyncMessageSenderMixin;
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/**
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* Anyone including this MUST also incude MessageSenderMixin.
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*/
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interface mixin SyncMessageSenderMixin
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{
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/**
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* Like |sendAsyncMessage()|, except blocks the sender until all
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* listeners of the message have been invoked. Returns an array
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* containing return values from each listener invoked.
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*/
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[Throws]
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sequence<any> sendSyncMessage(optional DOMString? messageName = null,
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optional any obj);
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};
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/**
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* ChildProcessMessageManager is used in a child process to communicate with the parent
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* process.
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*/
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[ChromeOnly, Exposed=Window]
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interface ChildProcessMessageManager : SyncMessageSender
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{
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};
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/**
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* Mixin for message manager globals. Anyone including this MUST also
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* include SyncMessageSenderMixin.
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*/
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interface mixin MessageManagerGlobal
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{
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/**
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* Print a string to stdout.
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*/
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void dump(DOMString str);
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/**
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* Ascii base64 data to binary data and vice versa
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*/
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[Throws]
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DOMString atob(DOMString asciiString);
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[Throws]
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DOMString btoa(DOMString base64Data);
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};
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interface mixin FrameScriptLoader
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{
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/**
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* Load a script in the (remote) frame. |url| must be the absolute URL.
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* data: URLs are also supported. For example data:,dump("foo\n");
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* If allowDelayedLoad is true, script will be loaded when the
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* remote frame becomes available. Otherwise the script will be loaded
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* only if the frame is already available.
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*/
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[Throws]
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void loadFrameScript(DOMString url, boolean allowDelayedLoad,
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optional boolean runInGlobalScope = false);
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/**
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* Removes |url| from the list of scripts which support delayed load.
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*/
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void removeDelayedFrameScript(DOMString url);
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/**
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* Returns all delayed scripts that will be loaded once a (remote)
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* frame becomes available. The return value is a list of pairs
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* [<URL>, <WasLoadedInGlobalScope>].
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*/
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[Throws]
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sequence<sequence<any>> getDelayedFrameScripts();
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};
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interface mixin ProcessScriptLoader
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{
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/**
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* Load a script in the (possibly remote) process. |url| must be the absolute
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* URL. data: URLs are also supported. For example data:,dump("foo\n");
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* If allowDelayedLoad is true, script will be loaded when the
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* remote frame becomes available. Otherwise the script will be loaded
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* only if the frame is already available.
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*/
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[Throws]
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void loadProcessScript(DOMString url, boolean allowDelayedLoad);
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/**
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* Removes |url| from the list of scripts which support delayed load.
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*/
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void removeDelayedProcessScript(DOMString url);
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/**
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* Returns all delayed scripts that will be loaded once a (remote)
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* frame becomes available. The return value is a list of pairs
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* [<URL>, <WasLoadedInGlobalScope>].
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*/
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[Throws]
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sequence<sequence<any>> getDelayedProcessScripts();
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};
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/**
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* Anyone including GlobalProcessScriptLoader MUST also include ProcessScriptLoader.
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*/
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interface mixin GlobalProcessScriptLoader
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{
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/**
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* Allows the parent process to set the initial process data for
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* new, not-yet-created child processes. This attribute should only
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* be used by the global parent process message manager. When a new
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* process is created, it gets a copy of this data (via structured
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* cloning). It can access the data via the initialProcessData
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* attribute of its childprocessmessagemanager.
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*
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* This value will always be a JS object if it's not null or undefined. Different
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* users are expected to set properties on this object. The property name should be
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* unique enough that other Gecko consumers won't accidentally choose it.
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*/
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[Throws]
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readonly attribute any initialProcessData;
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readonly attribute MozWritableSharedMap sharedData;
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};
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[ChromeOnly, Exposed=Window]
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interface ContentFrameMessageManager : EventTarget
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{
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/**
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* The current top level window in the frame or null.
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*/
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[Throws]
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readonly attribute WindowProxy? content;
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/**
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* The top level docshell or null.
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*/
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[Throws]
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readonly attribute nsIDocShell? docShell;
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/**
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* Returns the SchedulerEventTarget corresponding to the TabGroup
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* for this frame.
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*/
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readonly attribute nsIEventTarget? tabEventTarget;
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/**
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* Returns the outerWindowID of the browser window hosting the frame.
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* If, for some reason, the frameloader can't be resolved to a browser
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* window, this will return 0.
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*/
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readonly attribute long long chromeOuterWindowID;
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};
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ContentFrameMessageManager includes MessageManagerGlobal;
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ContentFrameMessageManager includes SyncMessageSenderMixin;
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ContentFrameMessageManager includes MessageSenderMixin;
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ContentFrameMessageManager includes MessageListenerManagerMixin;
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[ChromeOnly, Exposed=Window]
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interface ContentProcessMessageManager
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{
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/**
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* Read out a copy of the object that was initialized in the parent
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* process via ProcessScriptLoader.initialProcessData.
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*/
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[Throws]
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readonly attribute any initialProcessData;
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readonly attribute MozSharedMap sharedData;
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};
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ContentProcessMessageManager includes MessageManagerGlobal;
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ContentProcessMessageManager includes SyncMessageSenderMixin;
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|
ContentProcessMessageManager includes MessageSenderMixin;
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|
ContentProcessMessageManager includes MessageListenerManagerMixin;
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|
|
|
/**
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|
* Message "broadcasters" don't have a single "other side" that they send messages to, but
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* rather a set of subordinate message managers. For example, broadcasting a message
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|
* through a window message manager will broadcast the message to all frame message
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* managers within its window.
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*/
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|
[ChromeOnly, Exposed=Window]
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interface MessageBroadcaster : MessageListenerManager
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|
{
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/**
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|
* Like |sendAsyncMessage()|, but also broadcasts this message to
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* all "child" message managers of this message manager. See long
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* comment above for details.
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|
*
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|
* WARNING: broadcasting messages can be very expensive and leak
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* sensitive data. Use with extreme caution.
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*/
|
|
[Throws]
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void broadcastAsyncMessage(optional DOMString? messageName = null,
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optional any obj);
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/**
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* Number of subordinate message managers.
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*/
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readonly attribute unsigned long childCount;
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/**
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* Return a single subordinate message manager.
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*/
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MessageListenerManager? getChildAt(unsigned long aIndex);
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/**
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|
* Some processes are kept alive after their last tab/window are closed for testing
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* (see dom.ipc.keepProcessesAlive). This function releases those.
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*/
|
|
void releaseCachedProcesses();
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};
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|
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/**
|
|
* ChromeMessageBroadcaster is used for window and group message managers.
|
|
*/
|
|
[ChromeOnly, Exposed=Window]
|
|
interface ChromeMessageBroadcaster : MessageBroadcaster
|
|
{
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|
};
|
|
ChromeMessageBroadcaster includes FrameScriptLoader;
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/**
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* ParentProcessMessageManager is used in a parent process to communicate with all the
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* child processes.
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*/
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[ChromeOnly, Exposed=Window]
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interface ParentProcessMessageManager : MessageBroadcaster
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{
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};
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ParentProcessMessageManager includes ProcessScriptLoader;
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ParentProcessMessageManager includes GlobalProcessScriptLoader;
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[ChromeOnly, Exposed=Window]
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interface ChromeMessageSender : MessageSender
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{
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};
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ChromeMessageSender includes FrameScriptLoader;
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|
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/**
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* ProcessMessageManager is used in a parent process to communicate with a child process
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* (or with the process itself in a single-process scenario).
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|
*/
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[ChromeOnly, Exposed=Window]
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|
interface ProcessMessageManager : MessageSender
|
|
{
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// PID of the process being communicated with.
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|
readonly attribute long osPid;
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|
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// Whether this is message manager for the current process.
|
|
readonly attribute boolean isInProcess;
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};
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ProcessMessageManager includes ProcessScriptLoader;
|