nodejs eval script?

[micateam]

Description

        // 
        const getPixelLuaScript = `
            local key = KEYS[1]
            local position = tonumber(ARGV[1])
            local binaryColor = ""
            return '233' .. tostring(key)
            `;
            console.log(`getPixelLuaScript:${ position} ${chunkKey}`)
            const binaryColor = await this.redis.eval(getPixelLuaScript, 1, chunkKey, position);

getPixelLuaScript:32 pixel004
key is nil

Node.js Version

"redis": "^4.7.0",

Redis Server Version

No response

Node Redis Version

No response

Platform

No response

Logs

No response

[micateam]

I used this method. May I ask if the first method was cancelled?

const binaryColor = await this.redis.eval(getPixelLuaScript,{
                keys:[chunkKey],
                arguments:['100']
 });

[leibale]

I'm not too sure I understand your question, but anyway, the best way to use scripts with node-redis is to register them on the client rather than using the eval command:

import { createClient, defineScript, BlobStringReply } from 'redis';

const client = createClient({
  scripts: {
    getPixel: defineScript({
      SCRIPT: `
        local key = KEYS[1]
        local position = tonumber(ARGV[1])
        local binaryColor = ""
        return '233' .. tostring(key)
      `,
      NUMBER_OF_KEYS: 1,
      transformArguments(key: string, position: number) {
        return [key, position.toString()];
      },
      transformReply: undefined as unknown as () => BlobStringReply
    })
  }
});

client.on('error', err => console.error('Redis Client Error', err));

await client.connect();

// you can use the script just like a normal command, the types are inferred from `transformArguments` and `transformReply`
const result = await client.getPixel('key', 100);

see https://github.com/redis/node-redis/blob/master/docs/programmability.md#lua-scripts for more details