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Harden content script's message Port against spurious disconnections 

Those spurious disconnections have been observed to occur at
uBO's launch time.

Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/403

I have observed that this fixes an issue observed on Firefox 64
(current stable).

The reported Waterfox issue *may* be fixed as a result. If not,
the issue he still considered fixed as Waterfox is not
officially supported.
This commit is contained in:
Raymond Hill 2019-01-27 17:07:40 -05:00
parent 5261da69ac
commit 15100459b3
No known key found for this signature in database
GPG Key ID: 25E1490B761470C2
3 changed files with 89 additions and 60 deletions
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99
platform/chromium/vapi-client.js
View File

@ -1,7 +1,8 @@
/*******************************************************************************
uBlock Origin - a browser extension to block requests.
Copyright (C) 2014-2018 The uBlock Origin authors
Copyright (C) 2014-present The uBlock Origin authors
Copyright (C) 2015-present Raymond Hill
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@ -42,7 +43,6 @@ vAPI.randomToken = function() {
};
vAPI.sessionId = vAPI.randomToken();
vAPI.chrome = true;
vAPI.setTimeout = vAPI.setTimeout || self.setTimeout.bind(self);
/******************************************************************************/
@ -53,13 +53,13 @@ vAPI.shutdown = {
this.jobs.push(job);
},
exec: function() {
var job;
let job;
while ( (job = this.jobs.pop()) ) {
job();
}
},
remove: function(job) {
var pos;
let pos;
while ( (pos = this.jobs.indexOf(job)) !== -1 ) {
this.jobs.splice(pos, 1);
}
@ -79,7 +79,7 @@ vAPI.messaging = {
shuttingDown: false,
Connection: function(handler, details) {
var messaging = vAPI.messaging;
const messaging = vAPI.messaging;
this.messaging = messaging;
this.handler = handler;
this.id = details.id;
@ -87,18 +87,20 @@ vAPI.messaging = {
this.toToken = details.toToken;
this.from = details.from;
this.fromToken = details.fromToken;
this.checkBound = this.check.bind(this);
this.checkTimer = undefined;
// On Firefox it appears ports are not automatically disconnected when
// navigating to another page.
if ( messaging.Connection.pagehide !== undefined ) { return; }
messaging.Connection.pagehide = function() {
for ( var connection of this.connections.values() ) {
// On Firefox it appears ports are not automatically disconnected
// when navigating to another page.
const ctor = vAPI.messaging.Connection;
if ( ctor.pagehide !== undefined ) { return; }
ctor.pagehide = ( ) => {
for ( const connection of this.messaging.connections.values() ) {
connection.disconnect();
connection.handler(connection.toDetails('connectionBroken'));
connection.handler(
connection.toDetails('connectionBroken')
);
}
}.bind(messaging);
window.addEventListener('pagehide', messaging.Connection.pagehide);
};
window.addEventListener('pagehide', ctor.pagehide);
},
shutdown: function() {
@ -106,9 +108,15 @@ vAPI.messaging = {
this.destroyPort();
},
// https://github.com/uBlockOrigin/uBlock-issues/issues/403
// Spurious disconnection can happen, so do not consider such events
// as world-ending, i.e. stay around. Except for embedded frames.
disconnectListener: function() {
this.port = null;
vAPI.shutdown.exec();
if ( window !== window.top ) {
vAPI.shutdown.exec();
}
},
disconnectListenerBound: null,
@ -117,16 +125,15 @@ vAPI.messaging = {
// Sent to all channels
if ( details.broadcast ) {
for ( var channelName of this.channels.keys() ) {
for ( const channelName of this.channels.keys() ) {
this.sendToChannelListeners(channelName, details.msg);
}
return;
}
// Response to specific message previously sent
var listener;
if ( details.auxProcessId ) {
listener = this.pending.get(details.auxProcessId);
const listener = this.pending.get(details.auxProcessId);
if ( listener !== undefined ) {
this.pending.delete(details.auxProcessId);
listener(details.msg);
@ -137,7 +144,7 @@ vAPI.messaging = {
if ( details.channelName !== 'vapi' ) { return; }
// Internal handler
var connection;
let connection;
switch ( details.msg.what ) {
case 'connectionAccepted':
@ -150,11 +157,11 @@ vAPI.messaging = {
connection.receive(details.msg);
break;
case 'connectionRequested':
var listeners = this.channels.get(details.msg.to);
const listeners = this.channels.get(details.msg.to);
if ( listeners === undefined ) { return; }
var port = this.getPort();
const port = this.getPort();
if ( port === null ) { return; }
for ( listener of listeners ) {
for ( const listener of listeners ) {
if ( listener(details.msg) !== true ) { continue; }
details.msg.what = 'connectionAccepted';
details.msg.toToken = port.name;
@ -193,7 +200,7 @@ vAPI.messaging = {
clearTimeout(this.portTimer);
this.portTimer = null;
}
var port = this.port;
const port = this.port;
if ( port !== null ) {
port.disconnect();
port.onMessage.removeListener(this.messageListenerCallback);
@ -202,16 +209,16 @@ vAPI.messaging = {
}
this.channels.clear();
if ( this.connections.size !== 0 ) {
for ( var connection of this.connections.values() ) {
for ( const connection of this.connections.values() ) {
connection.receive({ what: 'connectionBroken' });
}
this.connections.clear();
}
// service pending callbacks
if ( this.pending.size !== 0 ) {
var pending = this.pending;
const pending = this.pending;
this.pending = new Map();
for ( var callback of pending.values() ) {
for ( const callback of pending.values() ) {
if ( typeof callback === 'function' ) {
callback(null);
}
@ -257,12 +264,12 @@ vAPI.messaging = {
if ( this.pending.size > 25 ) {
vAPI.shutdown.exec();
}
var port = this.getPort();
const port = this.getPort();
if ( port === null ) {
if ( typeof callback === 'function' ) { callback(); }
return;
}
var auxProcessId;
let auxProcessId;
if ( callback ) {
auxProcessId = this.auxProcessId++;
this.pending.set(auxProcessId, callback);
@ -275,9 +282,9 @@ vAPI.messaging = {
},
connectTo: function(from, to, handler) {
var port = this.getPort();
const port = this.getPort();
if ( port === null ) { return; }
var connection = new this.Connection(handler, {
const connection = new this.Connection(handler, {
id: from + '-' + to + '-' + vAPI.sessionId,
to: to,
from: from,
@ -298,19 +305,19 @@ vAPI.messaging = {
},
disconnectFrom: function(connectionId) {
var connection = this.connections.get(connectionId);
const connection = this.connections.get(connectionId);
if ( connection === undefined ) { return; }
connection.disconnect();
},
sendTo: function(connectionId, payload) {
var connection = this.connections.get(connectionId);
const connection = this.connections.get(connectionId);
if ( connection === undefined ) { return; }
connection.send(payload);
},
addChannelListener: function(channelName, listener) {
var listeners = this.channels.get(channelName);
const listeners = this.channels.get(channelName);
if ( listeners === undefined ) {
this.channels.set(channelName, [ listener ]);
} else if ( listeners.indexOf(listener) === -1 ) {
@ -320,9 +327,9 @@ vAPI.messaging = {
},
removeChannelListener: function(channelName, listener) {
var listeners = this.channels.get(channelName);
const listeners = this.channels.get(channelName);
if ( listeners === undefined ) { return; }
var pos = listeners.indexOf(listener);
const pos = listeners.indexOf(listener);
if ( pos === -1 ) { return; }
listeners.splice(pos, 1);
if ( listeners.length === 0 ) {
@ -335,11 +342,11 @@ vAPI.messaging = {
},
sendToChannelListeners: function(channelName, msg) {
var listeners = this.channels.get(channelName);
let listeners = this.channels.get(channelName);
if ( listeners === undefined ) { return; }
listeners = listeners.slice(0);
var response;
for ( var listener of listeners ) {
let response;
for ( const listener of listeners ) {
response = listener(msg);
if ( response !== undefined ) { break; }
}
@ -367,7 +374,7 @@ vAPI.messaging.Connection.prototype = {
this.checkTimer = undefined;
}
this.messaging.connections.delete(this.id);
var port = this.messaging.getPort();
const port = this.messaging.getPort();
if ( port === null ) { return; }
port.postMessage({
channelName: 'vapi',
@ -378,12 +385,15 @@ vAPI.messaging.Connection.prototype = {
if ( this.checkTimer !== undefined ) {
clearTimeout(this.checkTimer);
}
this.checkTimer = vAPI.setTimeout(this.checkBound, 499);
this.checkTimer = vAPI.setTimeout(
( ) => { this.check(); },
499
);
},
check: function() {
this.checkTimer = undefined;
if ( this.messaging.connections.has(this.id) === false ) { return; }
var port = this.messaging.getPort();
const port = this.messaging.getPort();
if ( port === null ) { return; }
port.postMessage({
channelName: 'vapi',
@ -407,7 +417,7 @@ vAPI.messaging.Connection.prototype = {
this.checkAsync();
break;
case 'connectionCheck':
var port = this.messaging.getPort();
const port = this.messaging.getPort();
if ( port === null ) { return; }
if ( this.messaging.connections.has(this.id) ) {
this.checkAsync();
@ -423,7 +433,7 @@ vAPI.messaging.Connection.prototype = {
}
},
send: function(payload) {
var port = this.messaging.getPort();
const port = this.messaging.getPort();
if ( port === null ) { return; }
port.postMessage({
channelName: 'vapi',
@ -439,9 +449,6 @@ vAPI.shutdown.add(function() {
window.vAPI = undefined;
});
// https://www.youtube.com/watch?v=rT5zCHn0tsg
// https://www.youtube.com/watch?v=E-jS4e3zacI
/******************************************************************************/
/******************************************************************************/

37
src/js/contentscript.js
View File

@ -1316,7 +1316,7 @@ vAPI.domSurveyor = (function() {
// Bootstrapping allows all components of the content script to be launched
// if/when needed.
(function bootstrap() {
vAPI.bootstrap = (function() {
const bootstrapPhase2 = function() {
// This can happen on Firefox. For instance:
@ -1372,7 +1372,16 @@ vAPI.domSurveyor = (function() {
});
};
// https://github.com/uBlockOrigin/uBlock-issues/issues/403
// If there was a spurious port disconnection -- in which case the
// response is expressly set to `null`, rather than undefined or
// an object -- let's stay around, we may be given the opportunity
// to try bootstrapping again later.
const bootstrapPhase1 = function(response) {
if ( response === null ) { return; }
vAPI.bootstrap = undefined;
// cosmetic filtering engine aka 'cfe'
const cfeDetails = response && response.specificCosmeticFilters;
if ( !cfeDetails || !cfeDetails.ready ) {
@ -1451,19 +1460,23 @@ vAPI.domSurveyor = (function() {
}
};
// This starts bootstrap process.
vAPI.messaging.send(
'contentscript',
{
what: 'retrieveContentScriptParameters',
url: window.location.href,
isRootFrame: window === window.top,
charset: document.characterSet
},
bootstrapPhase1
);
return function() {
vAPI.messaging.send(
'contentscript',
{
what: 'retrieveContentScriptParameters',
url: window.location.href,
isRootFrame: window === window.top,
charset: document.characterSet,
},
bootstrapPhase1
);
};
})();
// This starts bootstrap process.
vAPI.bootstrap();
/******************************************************************************/
/******************************************************************************/
/******************************************************************************/

13
src/js/scriptlets/should-inject-contentscript.js
View File

@ -23,11 +23,20 @@
// If content scripts are already injected, we need to respond with `false`,
// to "should inject content scripts?"
//
// https://github.com/uBlockOrigin/uBlock-issues/issues/403
// If the content script was not boostrapped, give it another try.
(function() {
try {
return vAPI.uBO !== true;
let status = vAPI.uBO !== true;
if ( status === false && vAPI.bootstrap ) {
self.requestIdleCallback(( ) => {
return vAPI && vAPI.bootstrap();
});
}
return status;
} catch(ex) {
}
return true;
})();
})();