redis-semaphore
Version:
Distributed mutex and semaphore based on Redis
37 lines • 1.75 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.acquireRedlockMultiSemaphore = acquireRedlockMultiSemaphore;
const debug_1 = __importDefault(require("debug"));
const lua_1 = require("../multiSemaphore/acquire/lua");
const utils_1 = require("../utils");
const redlock_1 = require("../utils/redlock");
const debug = (0, debug_1.default)('redis-semaphore:redlock-multi-semaphore:acquire');
async function acquireRedlockMultiSemaphore(clients, key, limit, permits, options) {
const { identifier, lockTimeout, acquireTimeout, acquireAttemptsLimit, retryInterval } = options;
let attempt = 0;
const end = Date.now() + acquireTimeout;
const quorum = (0, redlock_1.getQuorum)(clients.length);
let now;
while ((now = Date.now()) < end && ++attempt <= acquireAttemptsLimit) {
debug(key, identifier, 'attempt', attempt);
const promises = clients.map(client => (0, lua_1.acquireLua)(client, [key, limit, permits, identifier, lockTimeout, now])
.then(result => +result)
.catch(() => 0));
const results = await Promise.all(promises);
if (results.reduce(redlock_1.smartSum, 0) >= quorum) {
debug(key, identifier, 'acquired');
return true;
}
else {
const promises = clients.map(client => client.zrem(key, identifier).catch(() => 0));
await Promise.all(promises);
await (0, utils_1.delay)(retryInterval);
}
}
debug(key, identifier, 'timeout or reach limit');
return false;
}
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