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input_file.js
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input_file.js
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var base_input = require('../lib/base_input'),
util = require('util'),
path = require('path'),
logger = require('log4node'),
directory_detector = require('../lib/directory_detector'),
directory_watcher = require('../lib/directory_watcher'),
file_filter = require('../lib/file_filter'),
fs = require('fs'),
monitor_file = require('../lib/monitor_file'),
tail = require('../lib/tail_file'),
async = require('async');
function InputFile() {
base_input.BaseInput.call(this);
this.mergeConfig(this.unserializer_config());
this.mergeConfig({
name: 'File',
host_field: 'path',
optional_params: ['type', 'buffer_size', 'buffer_encoding', 'wait_delay_after_renaming', 'start_index', 'use_tail'],
default_values: {
'use_tail': false,
},
start_hook: this.start,
});
}
util.inherits(InputFile, base_input.BaseInput);
InputFile.prototype.monitorFile = function(dir, local_filename, start_index) {
var filename = (dir === '.' ? path.resolve('.') : dir) + '/' + local_filename;
if (this.monitored_files[filename] || !this.filter.filter(local_filename)) {
return;
}
logger.info('Start input file', filename);
var monitor = this.use_tail ? tail.tail(filename) : monitor_file.monitor(filename, {
buffer_size: this.buffer_size,
buffer_encoding: this.buffer_encoding,
wait_delay_after_renaming: this.wait_delay_after_renaming,
});
this.monitored_files[filename] = monitor;
monitor.on('error', function(err) {
this.emit('error', err);
}.bind(this));
monitor.on('data', function(data) {
this.unserialize_data(data, function(parsed) {
this.emit('data', parsed);
}.bind(this), function(data) {
this.emit('data', {
'message': data,
'path': filename,
'type': this.type,
});
}.bind(this));
}.bind(this));
monitor.start(function(err) {
if (err) {
this.emit('error', err);
}
}.bind(this), start_index);
};
InputFile.prototype.start = function(callback) {
logger.info('Start input on file', this.path);
if (this.start_index) {
this.start_index = parseInt(this.start_index, 10);
}
this.filter = file_filter.create(path.basename(this.path));
var detector = new directory_detector.DirectoryDetector();
detector.on('removed', function(dir) {
if (this.monitored_files[dir]) {
this.monitored_files[dir].close(function() {});
delete this.monitored_files[dir];
}
Object.keys(this.monitored_files).forEach(function(k) {
if (k.indexOf(dir) === 0) {
this.monitored_files[k].close(function() {});
delete this.monitored_files[k];
}
}.bind(this));
}.bind(this));
detector.on('exists', function(dir, newly_created) {
logger.info('Parent directory exists', dir, 'for reading', this.path);
fs.readdir(dir, function(err, l) {
if (err) {
return this.emit('error', new Error('Error while reading ' + dir + ' : ' + err));
}
l.forEach(function(x) {
this.monitorFile(dir, x, newly_created ? 0 : this.start_index);
}.bind(this));
try {
var dir_watcher = directory_watcher.register(dir, function(event, filename) {
this.monitorFile(dir, filename, 0);
}.bind(this));
this.monitored_files[dir] = {
close: function(callback) {
directory_watcher.unregister(dir_watcher);
callback();
}
};
}
catch(err) {
return this.emit('error', new Error('Error while reading ' + dir + ' : ' + err));
}
}.bind(this));
}.bind(this));
this.monitored_files = {};
this.monitored_files.__detector__ = detector;
detector.on('error', function(err) {
this.emit('error', err);
}.bind(this));
detector.start(path.dirname(this.path), callback);
};
InputFile.prototype.close = function(callback) {
logger.info('Closing input file', this.path);
async.eachSeries(Object.keys(this.monitored_files), function(x, callback) {
var o = this.monitored_files[x];
delete this.monitored_files[x];
o.close(callback);
}.bind(this), callback);
};
exports.create = function() {
return new InputFile();
};