使用 chokidar 使sails.js 服务器监控文件更改，然后发出套接字消息答案

【问题标题】：Make the sails.js server monitor file change using chokidar and then emit socket message使用 chokidar 使sails.js 服务器监控文件更改，然后发出套接字消息
【发布时间】：2014-07-15 11:24:57
【问题描述】：

我使用 chokidar 来监控文件夹中的文件是否已更改。目前，当用户在我的 ExperimentController 中更新 Experiment Model 时会触发它。

var chokidar = require('chokidar');
...
var watcher = chokidar.watch('assets/output-model-files', {ignored: /[\/\\]\./, persistent: true});
watcher.on('change', function(path) {
...read my changed file and update the content of my database, and send a socket publishUpdate message...
... read file content in an asynchronous way
fs.readFile(path,"utf-8", function (err, data) {
... update the experiment object with the content of the changed file
Experiment.update(req.param('id'), ExpObj, function expUpdated(err) {});
... send a message via socket saying that the exeriment object has been updated             
Experiment.publishUpdate(req.param('id'), {name: exp.name,
    results: JSON.stringify(myres),
    action: ('file has just been updated. nb of trajectories: '+totalNbTrajectories)
});

但我想持续监控目标文件夹中的任何更改，并在sails.js 服务器启动时发送 Experiment.publishUpdate 消息，而不是在用户更新实验对象时发送。我可以在哪里将该 chokidar.watch(...) 代码放在服务器端，以便从文件更改中更新实验对象？ socket.js？

【问题讨论】：

标签： sockets sails.js

【解决方案1】：

好的。我发现在 bootstrap.js 中定位代码似乎可以完美地重新调整偶数触发...

我的 bootstrap.js 现在看起来像：

var chokidar = require('chokidar');
var fs = require('fs');
var os = require('os');
var sys = require('sys');
module.exports.bootstrap = function(cb) {

// It's very important to trigger this callack method when you are finished 
// with the bootstrap!  (otherwise your server will never lift, since it's waiting on the bootstrap)

  User.update({}, {online: false},
    function userUpdated(err, users) {
        if (err) {
            console.log(err);
        } else {
            var watcher = chokidar.watch('assets/output-model-files', {ignored: /[\/\\]\./, persistent: true});
            watcher.on('change', function(path) {
                        console.log('File', path, 'has been changed'); 
                        // do file reading and presumably Experiment publish update here
            });
        }

        cb();
    }
  )

};

【讨论】：