redis-semaphore
Version:
Distributed mutex and semaphore based on Redis
38 lines • 1.43 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.acquireSemaphore = acquireSemaphore;
const debug_1 = __importDefault(require("debug"));
const utils_1 = require("../../utils");
const lua_1 = require("./lua");
const debug = (0, debug_1.default)('redis-semaphore:multi-semaphore:acquire');
async function acquireSemaphore(client, key, limit, permits, options) {
const { identifier, lockTimeout, acquireTimeout, acquireAttemptsLimit, retryInterval } = options;
let attempt = 0;
const end = Date.now() + acquireTimeout;
let now;
while ((now = Date.now()) < end && ++attempt <= acquireAttemptsLimit) {
debug(key, identifier, limit, lockTimeout, 'attempt', attempt);
const result = await (0, lua_1.acquireLua)(client, [
key,
limit,
permits,
identifier,
lockTimeout,
now
]);
debug(key, 'result', typeof result, result);
if (result === 1) {
debug(key, identifier, 'acquired');
return true;
}
else {
await (0, utils_1.delay)(retryInterval);
}
}
debug(key, identifier, limit, lockTimeout, 'timeout or reach limit');
return false;
}
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