执行redis eval命令在nodeJS中运行Lua脚本 [英] executing redis eval command to run Lua script in nodeJS

问题描述

在 Redis 中，我通过 CLI 运行 Lua 脚本，如下所示:-

In Redis I run a Lua script through CLI like this:-

$ redis-cli --eval debug_script.lua key1 key2 key3 key4 , arg1 arg2

所以，我的 Lua 脚本接受 4 个键和 2 个参数.

So, my Lua script accepts 4 keys and 2 arguments.

现在我想在 Node.js 中运行相同的脚本.

Now I want to run the same script in Node.js.

我正在使用 this 库在我的应用中导入 Redis.

I am using this library for importing Redis in my app.

我没有找到任何说明用于执行 Lua 脚本的 redisClient.eval(...) 函数参数的示例.

I didn't find any example which tells about the arguments of redisClient.eval(...) function for executing the Lua script.

因此，我只是随机打一些可能有用的东西.但似乎没有任何效果.

Thus I am just hitting something random that might work. But nothing seems to work.

我的 app.js 是这样的:

My app.js goes like this:

var redis = require("redis")
var client = redis.createClient();

// my hit and trial guess
client.eval(["script_file.lua", 1 "score" 0 10 , "meeting_type:email" meeting_status:close], function(err, res){
    console.log("something happened
");
});

我的问题:如何使用 node.js 执行以下命令，以便返回与通过 CLI(命令行界面)执行时相同的内容.

My question: How to execute below command using node.js, so that it returns the same thing as it does when executed through CLI(command-line-interface).

$ redis-cli --eval debug_script.lua key1 key2 key3 key4 , arg1 arg2

推荐答案

找到了一些解决方案:

解决方案 1 )

var redis = require('redis')
var client = redis.createClient()
var fs = require('fs')

client.eval(fs.readFileSync('./debug_script.lua'), 4, key1, key2, key3, key4, arg1, arg2, function(err, res) {
  console.log(res);
});

注意:4(eval 的第二个参数)表示脚本中要传递的键数.

Note: 4 (second argument of eval) represents the number of keys to be passed in the script.

解决方案 2) 创建子进程并运行 CLI 命令.

Solution 2) Creates a child process and run CLI command.

var redis = require("redis");
var client = redis.createClient();

var exec = require('child_process').exec;

var cmd = 'redis-cli --eval debug_script.lua key1 key2 key3 key4 , arg1 arg2';


exec(cmd, function(error, stdout, stderr) {
    // command output is in stdout
        console.log("something happened 
");
        console.log(stdout);
    });

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