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// Copyright (c) 2020, Compiler Explorer Authors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
import {executionAsyncId} from 'async_hooks';
import {default as Queue} from 'p-queue';
import PromClient from 'prom-client';
// globals as essentially the compilation queue is a singleton, and if we make them members of the queue, tests fail as
// when we create a second queue, the previous counters are still registered.
const queueEnqueued = new PromClient.Counter({
name: 'ce_compilation_queue_enqueued_total',
help: 'Total number of jobs enqueued',
});
const queueDequeued = new PromClient.Counter({
name: 'ce_compilation_queue_dequeued_total',
help: 'Total number of jobs dequeued',
});
const queueCompleted = new PromClient.Counter({
name: 'ce_compilation_queue_completed_total',
help: 'Total number of jobs completed',
});
export type Job<TaskResultType> = () => PromiseLike<TaskResultType>;
export class CompilationQueue {
private readonly _running: Set<number> = new Set();
private readonly _queue: Queue;
constructor(concurrency: number, timeout: number) {
this._queue = new Queue({
concurrency,
timeout,
throwOnTimeout: true,
});
}
static fromProps(ceProps) {
return new CompilationQueue(ceProps('maxConcurrentCompiles', 1), ceProps('compilationEnvTimeoutMs'));
}
enqueue<Result>(job: Job<Result>): PromiseLike<Result> {
const enqueueAsyncId = executionAsyncId();
// If we're asked to enqueue a job when we're already in a async queued job context, just run it.
// This prevents a deadlock.
if (this._running.has(enqueueAsyncId)) return job();
queueEnqueued.inc();
return this._queue.add(() => {
queueDequeued.inc();
const jobAsyncId = executionAsyncId();
if (this._running.has(jobAsyncId)) throw new Error('somehow we entered the context twice');
try {
this._running.add(jobAsyncId);
return job();
} finally {
this._running.delete(jobAsyncId);
queueCompleted.inc();
}
}) as PromiseLike<Result>; // TODO(supergrecko): investigate why this assert is needed
}
status(): {busy: boolean; pending: number; size: number} {
const pending = this._queue.pending;
const size = this._queue.size;
return {
busy: pending > 0 || size > 0,
pending,
size,
};
}
}
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