免责声明:我对节点很新(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,然后在缓冲区达到容量时刷新到磁盘
调用我的记录器包装器会导致缓冲编写器中出现异常
我确定我误解了require()是如何工作的,并且不同的人建议我使用新的chatlogs.Chatlogger()来创建对象但是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
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
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;
答案 0 :(得分:2)
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过缓冲区大小时,数据会自动刷新到磁盘。