redisess/esm/redis-script.js

Powerful redis session manager for NodeJS

import promisify from 'putil-promisify';
export class RedisScript {
    constructor(src, keys) {
        this._src = src;
        this._sha = '';
        this._keys = keys || [];
    }
    async execute(client, ...args) {
        if (!this._sha)
            await this._loadScript(client);
        try {
            return await this._execute(client, ...args);
        }
        catch (err) {
            /* istanbul ignore next */
            if (!String(err).includes('NOSCRIPT'))
                throw err;
            // Retry
            this._sha = '';
            return await this._execute(client, ...args);
        }
    }
    async _execute(client, ...args) {
        await this._loadScript(client);
        const prms = [...this._keys];
        const m = Math.max(this._keys.length, args.length);
        for (let i = 0; i < m; i++) {
            prms.push(this._keys[i] == null ? 'key' + (i + 1) : '' + this._keys[i]);
        }
        for (let i = 0; i < m; i++) {
            prms.push(args[i] == null ? '' : args[i]);
        }
        return !!(await promisify.fromCallback(cb => client.evalsha(this._sha, m, ...prms, cb)));
    }
    async _loadScript(client) {
        const resp = await promisify.fromCallback(cb => client.script('LOAD', this._src, cb));
        /* istanbul ignore next */
        if (!resp)
            throw new Error('Unable to load redis script in to redis cache');
        this._sha = resp;
    }
}