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make comment easier to read

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Bruno Windels 2021-04-09 15:24:10 +02:00
parent c604c31032
commit 606e30fed2
1 changed files with 10 additions and 9 deletions
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19
src/matrix/net/HomeServerRequest.js
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@ -44,27 +44,28 @@ export class HomeServerRequest {
}
}
}, err => {
// if this._sourceRequest is still set, the abort error came not from calling abort here
// if this._sourceRequest is still set,
// the abort error came not from calling abort here
if (err.name === "AbortError" && this._sourceRequest) {
// The service worker sometimes (only on Firefox, on long, large request,
// perhaps it has its own timeout?) aborts the request, see #187.
// When it happens, the best thing to do seems to be to retry.
//
// In the service worker, we will also actively abort requests
// In the service worker, we will also actively abort all
// ongoing requests when trying to get a new service worker to activate
// (this may surface in the app as a TypeError, which already gets mapped
// to a ConnectionError in the request function, or an AbortError,
// depending on the browser)
// when trying to get a new service worker to activate,
// as the service worker will only be replaced when there are
// no more (fetch) events for the current one to handle.
// depending on the browser), as the service worker will only be
// replaced when there are no more (fetch) events for the
// current one to handle.
//
// In that case, the request function (in fetch.js) will check
// the haltRequests flag on the service worker handler, and it will
// actually not do any requests, as that would break the update process.
// the haltRequests flag on the service worker handler, and
// block any new requests, as that would break the update process.
//
// So it is OK to return a ConnectionError here.
// If we're updating the service worker, the /versions polling will
// actually be blocked at the fetch level because haltRequests is set.
// be blocked at the fetch level because haltRequests is set.
// And for #187, retrying is the right thing to do.
const err = new ConnectionError(`Service worker aborted, either updating or hit #187.`);
log?.catch(err);