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109 lines
3.5 KiB
JavaScript
109 lines
3.5 KiB
JavaScript
/* 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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// Code that is shared between clients and workers.
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this.EXPORTED_SYMBOLS = ["AbstractPort"];
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this.AbstractPort = function AbstractPort(portid) {
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this._portid = portid;
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this._handler = undefined;
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this._closed = false;
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// pending messages sent to this port before it has a message handler.
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this._pendingMessagesIncoming = [];
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};
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AbstractPort.prototype = {
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_portType: null, // set by a subclass.
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// abstract methods to be overridden.
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_dopost: function fw_AbstractPort_dopost(data) {
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throw new Error("not implemented");
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},
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_onerror: function fw_AbstractPort_onerror(err) {
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throw new Error("not implemented");
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},
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// and concrete methods shared by client and workers.
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toString: function fw_AbstractPort_toString() {
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return "MessagePort(portType='" + this._portType + "', portId="
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+ this._portid + (this._closed ? ", closed=true" : "") + ")";
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},
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_JSONParse: function fw_AbstractPort_JSONParse(data) JSON.parse(data),
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_postControlMessage: function fw_AbstractPort_postControlMessage(topic, data) {
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let postData = {
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portTopic: topic,
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portId: this._portid,
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portFromType: this._portType,
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data: data
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};
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this._dopost(postData);
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},
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_onmessage: function fw_AbstractPort_onmessage(data) {
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// See comments in postMessage below - we work around a cloning
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// issue by using JSON for these messages.
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// Further, we allow the workers to override exactly how the JSON parsing
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// is done - we try and do such parsing in the client window so things
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// like prototype overrides on Array work as expected.
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if (!this._handler) {
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this._pendingMessagesIncoming.push(data);
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} else {
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data = this._JSONParse(data);
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try {
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this._handler({
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data: data,
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__exposedProps__: {
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data: 'r'
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}
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});
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} catch (ex) {
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this._onerror(ex);
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}
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}
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},
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set onmessage(handler) { // property setter for onmessage
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this._handler = handler;
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while (this._pendingMessagesIncoming.length) {
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this._onmessage(this._pendingMessagesIncoming.shift());
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}
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},
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get onmessage() {
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return this._handler;
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},
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/**
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* postMessage
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*
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* Send data to the onmessage handler on the other end of the port. The
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* data object should have a topic property.
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*
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* @param {jsobj} data
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*/
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postMessage: function fw_AbstractPort_postMessage(data) {
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if (this._closed) {
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throw new Error("port is closed");
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}
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// There seems to be an issue with passing objects directly and letting
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// the structured clone thing work - we sometimes get:
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// [Exception... "The object could not be cloned." code: "25" nsresult: "0x80530019 (DataCloneError)"]
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// The best guess is that this happens when funky things have been added to the prototypes.
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// It doesn't happen for our "control" messages, only in messages from
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// content - so we explicitly use JSON on these messages as that avoids
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// the problem.
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this._postControlMessage("port-message", JSON.stringify(data));
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},
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close: function fw_AbstractPort_close() {
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if (this._closed) {
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return; // already closed.
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}
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this._postControlMessage("port-close");
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// and clean myself up.
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this._handler = null;
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this._pendingMessagesIncoming = [];
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this._closed = true;
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}
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};
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