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node -v : 8.1.2
I use redis client node_redis with node 8 util.promisify , no blurbird.
the callback redis.get is ok, but promisify type get error message
TypeError: Cannot read property 'internal_send_command' of undefined
at get (D:\Github\redis-test\node_modules\redis\lib\commands.js:62:24)
at get (internal/util.js:229:26)
at D:\Github\redis-test\app.js:23:27
at Object. (D:\Github\redis-test\app.js:31:3)
at Module._compile (module.js:569:30)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:503:32)
at tryModuleLoad (module.js:466:12)
at Function.Module._load (module.js:458:3)
at Function.Module.runMain (module.js:605:10)
my test code
const util = require('util'); var redis = require("redis"), client = redis.createClient({ host: "192.168.99.100", port: 32768, }); let get = util.promisify(client.get); (async function () { client.set(["aaa", JSON.stringify({ A: 'a', B: 'b', C: "C" })]); client.get("aaa", (err, value) => { console.log(`use callback: ${value}`); }); try { let value = await get("aaa"); console.log(`use promisify: ${value}`); } catch (e) { console.log(`promisify error:`); console.log(e); } client.quit(); })() 
229
The util. promisify() method basically takes a function as an input that follows the common Node. js callback style, i.e., with a (err, value) and returns a version of the same that returns a promise instead of a callback.
Create new session. js file in the root directory with the following content: const express = require('express'); const session = require('express-session'); const redis = require('redis'); const client = redis. createClient(); const redisStore = require('connect-redis')(session); const app = express(); app.
Redis, an in-memory database that stores data in the server memory, is a popular tool to cache data. You can connect to Redis in Node. js using the node-redis module, which gives you methods to retrieve and store data in Redis.
changing let get = util.promisify(client.get);
to let get = util.promisify(client.get).bind(client);
solved it for me :)
57
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