Sakurai/pdf.js
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Detect and handle premature worker load error

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Fall back to a fake worker if the worker fails to load or initialize,
e.g. due to a network error, a security error or simply a script error.
This commit is contained in:
Rob Wu 2015-12-25 13:24:19 +01:00
parent e1ac5744d0
commit c8996f654f
1 changed files with 26 additions and 6 deletions
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32
src/display/api.js
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@ -1302,11 +1302,32 @@ var PDFWorker = (function PDFWorkerClosure() {
// https://bugzilla.mozilla.org/show_bug.cgi?id=683280
var worker = new Worker(workerSrc);
var messageHandler = new MessageHandler('main', 'worker', worker);
messageHandler.on('test', function PDFWorker_test(data) {
var terminateEarly = function() {
worker.removeEventListener('error', onWorkerError);
messageHandler.destroy();
worker.terminate();
if (this.destroyed) {
this._readyCapability.reject(new Error('Worker was destroyed'));
messageHandler.destroy();
worker.terminate();
} else {
// Fall back to fake worker if the termination is caused by an
// error (e.g. NetworkError / SecurityError).
this._setupFakeWorker();
}
}.bind(this);
var onWorkerError = function(event) {
if (!this._webWorker) {
// Worker failed to initialize due to an error. Clean up and fall
// back to the fake worker.
terminateEarly();
}
}.bind(this);
worker.addEventListener('error', onWorkerError);
messageHandler.on('test', function PDFWorker_test(data) {
worker.removeEventListener('error', onWorkerError);
if (this.destroyed) {
terminateEarly();
return; // worker was destroyed
}
var supportTypedArray = data && data.supportTypedArray;
@ -1333,10 +1354,9 @@ var PDFWorker = (function PDFWorkerClosure() {
});
messageHandler.on('ready', function (data) {
worker.removeEventListener('error', onWorkerError);
if (this.destroyed) {
this._readyCapability.reject(new Error('Worker was destroyed'));
messageHandler.destroy();
worker.terminate();
terminateEarly();
return; // worker was destroyed
}
try {