@apiratorjs/locking-redis
Version:
An extension to the core @apiratorjs/locking library, providing Redis-based implementations of distributed mutexes and semaphores for true cross-process concurrency control in Node.js.
69 lines • 2.72 kB
JavaScript
;
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
var ownKeys = function(o) {
ownKeys = Object.getOwnPropertyNames || function (o) {
var ar = [];
for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
return ar;
};
return ownKeys(o);
};
return function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
__setModuleDefault(result, mod);
return result;
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.RedisScript = void 0;
const crypto = __importStar(require("node:crypto"));
/**
* A Lua script kept in the server-side script cache and invoked by its SHA1,
* so the source is not sent on every call.
*
* Falls back to EVAL whenever the server does not know the script - a fresh
* server, SCRIPT FLUSH, a restart, a failover, or another node of a cluster.
* That fallback re-populates the cache, so the next call is an EVALSHA again.
*/
class RedisScript {
constructor(source) {
this.source = source;
// Redis keys its script cache by the SHA1 of the body, so the digest can be
// computed locally instead of paying a SCRIPT LOAD round-trip up front.
this.sha1 = crypto.createHash("sha1").update(source).digest("hex");
}
async run(client, options) {
try {
return await client.evalSha(this.sha1, options);
}
catch (error) {
if (!RedisScript.isNoScriptError(error)) {
throw error;
}
return await client.eval(this.source, options);
}
}
static isNoScriptError(error) {
return error instanceof Error && error.message.startsWith("NOSCRIPT");
}
}
exports.RedisScript = RedisScript;
//# sourceMappingURL=redis-script.js.map