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Fix racy promises in SpecTestRunner #2693

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Merged
merged 5 commits into from
Mar 9, 2020
Merged

Fix racy promises in SpecTestRunner #2693

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5c3b0b3
add iterative drain on AQ
Mar 2, 2020
a584393
make comments gud
Mar 4, 2020
9add026
modify drain
Mar 4, 2020
5068b66
removing counter for async queue operations
Mar 4, 2020
2a0dc71
add comment as per sebastian
Mar 4, 2020
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13 changes: 10 additions & 3 deletions packages/firestore/src/util/async_queue.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -372,9 +372,16 @@ export class AsyncQueue {
* Waits until all currently queued tasks are finished executing. Delayed
* operations are not run.
*/
drain(): Promise<void> {
// It should still be possible to drain the queue after it is shutting down.
return this.enqueueEvenAfterShutdown(() => Promise.resolve());
async drain(): Promise<void> {
// Operations in the queue prior to draining may have enqueued additional
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I don't know if this works, but if it does you could get rid of all size accounting:

let currentTail : Promise<void>;
do (
  currentTail = this.tail;
  await currentTail;
} while (currentTail !== this.tail);

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done.

// operations. Keep draining the queue until the tail is no longer advanced,
// which indicates that no more new operations were enqueued and that all
// operations were executed.
let currentTail: Promise<unknown>;
do {
currentTail = this.tail;
await currentTail;
} while (currentTail !== this.tail);
}

/**
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2 changes: 1 addition & 1 deletion packages/firestore/test/unit/specs/limbo_spec.test.ts
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Expand Up @@ -476,12 +476,12 @@ describeSpec('Limbo Documents:', [], () => {
.expectLimboDocs(docB.key, docC.key)
.client(1)
.stealPrimaryLease()
.expectListen(query, 'resume-token-1000000')
.client(0)
.runTimer(TimerId.ClientMetadataRefresh)
.expectPrimaryState(false)
.expectLimboDocs()
.client(1)
.expectListen(query, 'resume-token-1000000')
.watchAcksFull(query, 3 * 1e6)
.expectLimboDocs(docB.key, docC.key)
.ackLimbo(3 * 1e6, deletedDocB)
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