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运行时从文件动态加载函数

require node.js javascript

0

Kaito Kid · 技术社区 · 7 年前

我有一些nodejs代码可以作为机器人玩游戏的仲裁者。

每个bot都是它自己的文件,其中有一些预定义的 functions 使用固定名称(每个bot都将使用相同的名称和参数调用其函数,例如 PlayRound() )

现在我想,在 runtime ,在游戏中添加机器人程序。就像我告诉仲裁人 botName1 它会在bots文件夹中查找名为botname1.js的文件,然后能够调用 botName1.PlayRound() 后来。

自从 require 似乎只使用文字静态字符串,而不使用运行时值,是否有一种方法可以做到这一点?

样例代码:

const readline = require('readline');
const readLine = readline.createInterface({ input: process.stdin });

var players = []
var playerFiles = [];

readLine.on('line', (ln) => {

    var ws = ln.split(' ');

    if (ws[0].toLowerCase() === 'add') {
        players[players.length] = ws[1];
        // I would like to add the file corresponding to the name here
    } else if (ws[0].toLowerCase() === 'list'){
        console.log('There are currently ' + players.length + ' players registered:');
        for (var p in players) {
            console.log(players[p]);
        }
    } else if (ws[0].toLowerCase() === 'start'){
        // I would like to do this here
        for (var playerFile in playerFiles) {
            playerFiles[playerFile].PlayRound();
        }
    }

});

2 回复 | 直到 7 年前

1

Himanshu Singh 7 年前

botname botfilepath
botfile botfunction

bots

const fs        = require( "fs" ),
      path      = require( "path" ),
      botsDir   = path.join( __dirname, "bots" );

/** One time read to fetch all the bot files in bots dir */
const files         = fs.readdirSync( botsDir ),
      /** Here we create the map of bot and bot file path */
      availableBots = files
                        .reduce( ( botMap, file ) => Object.assign( botMap, { 
                            [ file.replace(".js", "") ] : path.join( botsDir, file ) 
                        } ), {} );

// Your code
const botThatWillBeJoiningAtRuntime = "BotC"; // This would be some calculation to determine bot that joins at runtime.

/** Here we safely require the bot file only if we have one corresponding to the bot that is joining */
if ( availableBots[botThatWillBeJoiningAtRuntime] ) {
    const botFunc = require( availableBots[botThatWillBeJoiningAtRuntime] );
}

if

2

1

Yash Thakor 7 年前

 fs.readdirSync(PATHOFDIRECTORYCONTAININGFILEs)
       .forEach((file) =>  {
        var name = file.replace('.js', '');
        if(name === botname) {
          require('./' + file).PlayRound();
        }
    });

 const readline = require('readline');
 const fs = require('fs);
 const readLine = readline.createInterface({ input: process.stdin });

 var players = []
 var playerFiles = [];

 readLine.on('line', (ln) => {

var ws = ln.split(' ');

if (ws[0].toLowerCase() === 'add') {
    players[players.length] = ws[1];
    //
} else if (ws[0].toLowerCase() === 'list'){
    console.log('There are currently ' + players.length + ' players 
        registered:');
    for (var p in players) {
        console.log(players[p]);
    }
} else if (ws[0].toLowerCase() === 'start'){
    // I would like to do this here

   fs.readdirSync(__diname)
   .forEach((file) =>  {
       for (var playerFile in playerFiles) {
         var name = file.replace('.js', '');
         if(name === playerFile) {
         require('./' + file).PlayRound();
        }
     }
  });
});