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免责声明：我对节点相当陌生（但不是 JavaScript）。

我只是想写一个记录器类，它在内存中一次保存几行，然后在其缓冲区达到容量时刷新到磁盘

问题

调用我的记录器包装器会导致缓冲写入器出现异常

我确定我误解了 require() 的工作原理，还有很多人建议我使用新的 chatlogs.Chatlogger() 创建对象，但我没有看到许多其他节点库使用这种工作方式

/www/im/node_modules/buffered-writer/lib/buffered-writer.js:125
    cb ();
        ^
TypeError: undefined is not a function
    at Writer.flush (/www/nodeim/node_modules/buffered-writer/lib/buffered-writer.js:125:3)
    at Chatlogger.close (/www/nodeim/helpers/chatlogs.js:27:14)
    at Object.<anonymous> (/www/nodeim/app.js:76:16)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:901:3

调用代码...

var chatlogs = require('./helpers/chatlogs.js'); 
var chatlogger_obj = new chatlogs.Chatlogger();

chatlogger_obj.open("logs/log.txt");
chatlogger_obj.log("TESTING");
chatlogger_obj.close();

process.exit(0);

包装类

./helpers/chatlogs.js

exports.version = '0.0.1';

var 
  buffer = require('buffered-writer'),
    fs = require('fs');

var Chatlogger = function() {
    this.handle = null,
    this.filename = "",
    this.dirtyops = 0;
}

Chatlogger.prototype.open = function (filename) {

    //fs.unlink(filename);

    this.filename = filename;
    this.handle = buffer.open(filename)
        .on ("error", function (error) {
            //this.handle = null;
            console.log (error);
        });
}

Chatlogger.prototype.close = function() {
    console.log("CLOSING");
    this.handle.flush();
    this.handle.close();
    this.handle = null;
}

Chatlogger.prototype.log = function (str) {

    console.log(str);
    this.handle.writeln(str);

    if (this.dirtyops++ > 5)
    {
        console.log("FLUSHING");
        this.handle.flush();
        this.dirtyops = 0;
    }
}

module.exports.Chatlogger = Chatlogger;
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1 回答 1

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我是这个模块的作者。您需要将回调传递给flush函数，但不需要调用flush。当缓冲写入器关闭或写入时超出缓冲区大小时，数据会自动刷新到磁盘。

Writer#flush(回调)

于 2013-07-24T07:39:24.397 回答