redis-semaphore
Version:
Distributed mutex and semaphore based on Redis
39 lines • 1.52 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const crypto_1 = require("crypto");
const debug_1 = __importDefault(require("debug"));
const index_1 = require("./index");
const debug = (0, debug_1.default)('redis-semaphore:eval');
function createSHA1(script) {
return (0, crypto_1.createHash)('sha1').update(script, 'utf8').digest('hex');
}
function isNoScriptError(err) {
return err.toString().indexOf('NOSCRIPT') !== -1;
}
function createEval(script, keysCount) {
const sha1 = createSHA1(script);
debug('creating script:', script, 'sha1:', sha1);
return async function optimizedEval(client, args) {
const connectionName = (0, index_1.getConnectionName)(client);
const evalSHAArgs = [sha1, keysCount, ...args];
debug(connectionName, sha1, 'attempt, args:', evalSHAArgs);
try {
return (await client.evalsha(sha1, keysCount, ...args));
}
catch (err) {
if (isNoScriptError(err)) {
const evalArgs = [script, keysCount, ...args];
debug(connectionName, sha1, 'fallback to eval, args:', evalArgs);
return (await client.eval(script, keysCount, ...args));
}
else {
throw err;
}
}
};
}
exports.default = createEval;
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