mirror of https://github.com/grpc/grpc-node.git
94 lines
2.4 KiB
TypeScript
94 lines
2.4 KiB
TypeScript
/*
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* Copyright 2019 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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import * as assert from 'assert';
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const toCall = new Map<() => void, number>();
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const afterCallsQueue: Array<() => void> = [];
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/**
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* Assert that the given function doesn't throw an error, and then return
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* its value.
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* @param fn The function to evaluate.
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*/
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export function noThrowAndReturn<T>(fn: () => T): T {
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try {
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return fn();
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} catch (e) {
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assert.throws(() => {
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throw e;
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});
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throw e; // for type safety only
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}
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}
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/**
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* Helper function that returns true when every function wrapped with
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* mustCall has been called.
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*/
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function mustCallsSatisfied(): boolean {
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let result = true;
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toCall.forEach(value => {
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result = result && value === 0;
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});
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return result;
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}
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export function clearMustCalls(): void {
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afterCallsQueue.length = 0;
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}
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/**
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* Wraps a function to keep track of whether it was called or not.
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* @param fn The function to wrap.
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*/
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// tslint:disable:no-any
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export function mustCall<T>(fn: (...args: any[]) => T): (...args: any[]) => T {
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const existingValue = toCall.get(fn);
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if (existingValue !== undefined) {
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toCall.set(fn, existingValue + 1);
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} else {
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toCall.set(fn, 1);
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}
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return (...args: any[]) => {
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const result = fn(...args);
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const existingValue = toCall.get(fn);
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if (existingValue !== undefined) {
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toCall.set(fn, existingValue - 1);
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}
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if (mustCallsSatisfied()) {
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afterCallsQueue.forEach(fn => fn());
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afterCallsQueue.length = 0;
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}
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return result;
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};
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}
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/**
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* Calls the given function when every function that was wrapped with
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* mustCall has been called.
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* @param fn The function to call once all mustCall-wrapped functions have
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* been called.
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*/
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export function afterMustCallsSatisfied(fn: () => void): void {
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if (!mustCallsSatisfied()) {
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afterCallsQueue.push(fn);
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} else {
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fn();
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}
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}
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