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Bug 878958: Implement ChildDebuggerTransport, a debug protocol transport for communicating with content child processes via process message managers. r=dcamp

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Transport classes (or prototypes?) should have a label that the requester telemetry stuff can cite, instead of that freaky check we have now.
This commit is contained in:
Jim Blandy 2013-07-12 11:08:28 -07:00
parent 62df5c4f44
commit bbb754faad
1 changed files with 53 additions and 4 deletions
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57
toolkit/devtools/server/transport.js
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@ -11,6 +11,8 @@ Components.utils.import("resource://gre/modules/NetUtil.jsm");
* An adapter that handles data transfers between the debugger client and
* server. It can work with both nsIPipe and nsIServerSocket transports so
* long as the properly created input and output streams are specified.
* (However, for intra-process connections, LocalDebuggerTransport, below,
* is more efficient than using an nsIPipe pair with DebuggerTransport.)
*
* @param aInput nsIInputStream
* The input stream.
@ -20,12 +22,12 @@ Components.utils.import("resource://gre/modules/NetUtil.jsm");
* Given a DebuggerTransport instance dt:
* 1) Set dt.hooks to a packet handler object (described below).
* 2) Call dt.ready() to begin watching for input packets.
* 3) Send packets as you please, and handle incoming packets passed to
* hook.onPacket.
* 3) Call dt.send() to send packets as you please, and handle incoming
* packets passed to hook.onPacket.
* 4) Call dt.close() to close the connection, and disengage from the event
* loop.
*
* A packet handler object is an object with two methods:
* A packet handler is an object with two methods:
*
* - onPacket(packet) - called when we have received a complete packet.
* |Packet| is the parsed form of the packet --- a JavaScript value, not
@ -33,7 +35,7 @@ Components.utils.import("resource://gre/modules/NetUtil.jsm");
*
* - onClosed(status) - called when the connection is closed. |Status| is
* an nsresult, of the sort passed to nsIRequestObserver.
*
*
* Data is transferred as a JSON packet serialized into a string, with the
* string length prepended to the packet, followed by a colon
* ([length]:[packet]). The contents of the JSON packet are specified in
@ -278,3 +280,50 @@ LocalDebuggerTransport.prototype = {
}
}
};
/**
* A transport for the debugging protocol that uses nsIMessageSenders to
* exchange packets with servers running in child processes.
*
* In the parent process, |aSender| should be the nsIMessageSender for the
* child process. In a child process, |aSender| should be the child process
* message manager, which sends packets to the parent.
*
* aPrefix is a string included in the message names, to distinguish
* multiple servers running in the same child process.
*
* This transport exchanges messages named 'debug:<prefix>:packet', where
* <prefix> is |aPrefix|, whose data is the protocol packet.
*/
function ChildDebuggerTransport(aSender, aPrefix) {
this._sender = aSender.QueryInterface(Components.interfaces.nsIMessageSender);
this._messageName = "debug:" + aPrefix + ":packet";
}
/*
* To avoid confusion, we use 'message' to mean something that
* nsIMessageSender conveys, and 'packet' to mean a remote debugging
* protocol packet.
*/
ChildDebuggerTransport.prototype = {
constructor: ChildDebuggerTransport,
hooks: null,
ready: function () {
this._sender.addMessageListener(this._messageName, this);
},
close: function () {
this._sender.removeMessageListener(this._messageName, this);
this.hooks.onClosed();
},
receiveMessage: function ({data}) {
this.hooks.onPacket(data);
},
send: function (packet) {
this._sender.sendAsyncMessage(this._messageName, packet);
}
};