redis-semaphore
Version:
Distributed mutex and semaphore based on Redis
48 lines • 2.15 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.refreshRedlockSemaphore = refreshRedlockSemaphore;
const debug_1 = __importDefault(require("debug"));
const lua_1 = require("../semaphore/acquire/lua");
const lua_2 = require("../semaphore/refresh/lua");
const redlock_1 = require("../utils/redlock");
const debug = (0, debug_1.default)('redis-semaphore:redlock-semaphore:refresh');
async function refreshRedlockSemaphore(clients, key, limit, options) {
const { identifier, lockTimeout } = options;
const now = Date.now();
debug(key, identifier, now);
const quorum = (0, redlock_1.getQuorum)(clients.length);
const promises = clients.map(client => (0, lua_2.refreshLua)(client, [key, limit, identifier, lockTimeout, now])
.then(result => +result)
.catch(() => 0));
const results = await Promise.all(promises);
debug('results', results);
const refreshedCount = results.reduce(redlock_1.smartSum, 0);
if (refreshedCount >= quorum) {
debug(key, identifier, 'refreshed');
if (refreshedCount < clients.length) {
debug(key, identifier, 'try to acquire on failed nodes');
const promises = results
.reduce((failedClients, result, index) => {
if (!result) {
failedClients.push(clients[index]);
}
return failedClients;
}, [])
.map(client => (0, lua_1.acquireLua)(client, [key, limit, identifier, lockTimeout, now])
.then(result => +result)
.catch(() => 0));
const acquireResults = await Promise.all(promises);
debug(key, identifier, 'acquire on failed nodes results', acquireResults);
}
return true;
}
else {
const promises = clients.map(client => client.zrem(key, identifier).catch(() => 0));
await Promise.all(promises);
return false;
}
}
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