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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// -----------------------------------------------------------------------------
// NOTE: If you change this file you need to touch renderer_resources.grd to
// have your change take effect.
// -----------------------------------------------------------------------------
var chrome = chrome || {};
(function () {
native function OpenChannelToExtension(id);
native function CloseChannel(portId);
native function PostMessage(portId, msg);
// Port object. Represents a connection to another script context through
// which messages can be passed.
chrome.Port = function(portId) {
if (chrome.Port.ports_[portId]) {
throw new Error("Port '" + portId + "' already exists.");
}
this.portId_ = portId; // TODO(mpcomplete): readonly
this.onDisconnect = new chrome.Event();
this.onMessage = new chrome.Event();
chrome.Port.ports_[portId] = this;
};
// Map of port IDs to port object.
chrome.Port.ports_ = {};
// Called by native code when a channel has been opened to this context.
chrome.Port.dispatchOnConnect_ = function(portId, tab) {
var port = new chrome.Port(portId);
if (tab) {
tab = JSON.parse(tab);
}
port.tab = tab;
chrome.Event.dispatch_("channel-connect", [port]);
};
// Called by native code when a channel has been closed.
chrome.Port.dispatchOnDisconnect_ = function(portId) {
var port = chrome.Port.ports_[portId];
if (port) {
port.onDisconnect.dispatch(port);
delete chrome.Port.ports_[portId];
}
};
// Called by native code when a message has been sent to the given port.
chrome.Port.dispatchOnMessage_ = function(msg, portId) {
var port = chrome.Port.ports_[portId];
if (port) {
if (msg) {
msg = JSON.parse(msg);
}
port.onMessage.dispatch(msg, port);
}
};
// Sends a message asynchronously to the context on the other end of this
// port.
chrome.Port.prototype.postMessage = function(msg) {
// JSON.stringify doesn't support a root object which is undefined.
if (msg === undefined)
msg = null;
PostMessage(this.portId_, JSON.stringify(msg));
};
// Disconnects the port from the other end.
chrome.Port.prototype.disconnect = function() {
delete chrome.Port.ports_[this.portId_];
CloseChannel(this.portId_);
}
// Extension object.
chrome.Extension = function(id) {
this.id_ = id;
};
// Opens a message channel to the extension. Returns a Port for
// message passing.
chrome.Extension.prototype.connect = function() {
var portId = OpenChannelToExtension(this.id_);
if (portId == -1)
throw new Error("No such extension: '" + this.id_ + "'");
return new chrome.Port(portId);
};
// Returns a resource URL that can be used to fetch a resource from this
// extension.
chrome.Extension.prototype.getURL = function(path) {
return "chrome-extension://" + this.id_ + "/" + path;
};
chrome.onUnload_.addListener(function() {
for (var i in chrome.Port.ports_) {
chrome.Port.ports_[i].disconnect();
}
});
})();
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