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unit.test.js
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unit.test.js
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/* eslint-disable no-await-in-loop */
const delay = require('delay');
const faker = require('faker');
const Redis = require('ioredis');
const { lock } = require('.');
describe('Lock tests', () => {
/**
* @type {import('ioredis').Redis}
*/
let redis;
// If REDIS_URI variable is null, will default to localhost
beforeAll(() => {
redis = new Redis(process.env.REDIS_URI);
});
afterEach(async () => {
await redis.flushdb();
});
afterAll(() => {
redis.disconnect();
});
describe('Locking functionality', () => {
let counter = 0;
async function unsafeIncrement() {
await delay(faker.datatype.number({ min: 10, max: 50 }));
const counterValue = counter;
await delay(faker.datatype.number({ min: 10, max: 50 }));
counter = counterValue + 1;
}
test('The unsafe function has race condition', async () => {
counter = 0;
await Promise.all(new Array(20).fill(0).map(unsafeIncrement));
expect(counter).not.toEqual(20);
});
test('Locks handle race conditions', async () => {
counter = 0;
await Promise.all(
new Array(20).fill(0).map(async () => {
const unlock = await lock(redis, 'test');
await unsafeIncrement();
await unlock();
}),
);
expect(counter).toEqual(20);
});
});
describe('options', () => {
test('timeout', async () => {
const lockName = 'timeout-test';
const timeBeforeLock = new Date().valueOf();
await lock(redis, lockName, { timeoutMillis: 200 });
const unlock = await lock(redis, lockName);
const timeAfterLock = new Date().valueOf();
await unlock();
expect(timeAfterLock - timeBeforeLock).toBeGreaterThanOrEqual(200);
expect(timeAfterLock - timeBeforeLock).toBeLessThanOrEqual(220);
});
test('retry time', async () => {
const lockName = 'retry-test';
await lock(redis, lockName, { timeoutMillis: 20 });
const timeBeforeLock = new Date().valueOf();
const unlock = await lock(redis, lockName, { retryTimeMillis: 200 });
const timeAfterLock = new Date().valueOf();
await unlock();
expect(timeAfterLock - timeBeforeLock).toBeGreaterThanOrEqual(200);
expect(timeAfterLock - timeBeforeLock).toBeLessThanOrEqual(220);
});
test('fail time', async () => {
const lockName = 'fail-test';
const unlock = await lock(redis, lockName);
const timeBeforeLock = new Date().valueOf();
let timeAfterLock;
try {
await lock(redis, lockName, { failAfterMillis: 200 });
fail('Lock did not fail'); // eslint-disable-line no-undef
} catch (err) {
expect(err.message).toContain(`"${lockName}"`);
timeAfterLock = new Date().valueOf();
}
await unlock();
expect(timeAfterLock - timeBeforeLock).toBeGreaterThanOrEqual(200);
expect(timeAfterLock - timeBeforeLock).toBeLessThanOrEqual(220);
await delay(1000);
// Assert that the lock function is no longer attempting to acquire the lock asynchronously
const lockValue = await redis.get('@simple-redis-mutex:lock-fail-test');
expect(lockValue).toBeNull();
});
});
describe('fifo', () => {
let elements = [];
async function unsafeAppend(withLock = false) {
const push = async (index) => {
await delay(faker.datatype.number({ min: 10, max: 50 }));
elements.push(index);
};
const lockName = 'push-lock';
const promises = [];
for (let i = 0; i < 20; i++) {
await delay(5);
let pushPromise = Promise.resolve();
if (withLock) {
// eslint-disable-next-line no-loop-func
pushPromise = new Promise((resolve) => {
lock(redis, lockName, { fifo: true })
.then((unlock) => push(i).then(() => unlock()))
.then(resolve);
});
} else {
pushPromise = push(i);
}
promises.push(pushPromise);
}
await Promise.all(promises);
}
function isConsecutive(arr) {
for (let i = 1; i < arr.length; i++) {
if (arr[i - 1] > arr[i]) {
return false;
}
}
return true;
}
test('unsafeAppend is unsafe', async () => {
elements = [];
await unsafeAppend();
expect(isConsecutive(elements)).toBe(false);
});
test('FIFO lock works', async () => {
elements = [];
await unsafeAppend(true);
expect(isConsecutive(elements)).toBe(true);
});
});
});