function tailFile (file) {
var tail = new Tail(file, {start: getFilesizeInBytes(file)})
tail.on('line', function (line) {
parseLine(line, file, log)
})
tail.on('error', function (error) {
console.log('ERROR: ', error)
})
console.log('Watching file:' + file)
return tail
}
InputFile.prototype.tailFile = function (file) {
var tail = null
var pos = {start: 0}
if (this.fileNamesToWatch.indexOf(file) > -1) {
// check if we watch this file already
return null
} else {
}
try {
pos = this.getTailPosition(file)
} catch (error) {
// file might not exists, we ignore it and start watching
pos = {start: 0}
}
if (this.scanCounter > 0) {
// a new file matched the glob pattern
// reading from begin of file
logger.log('New file detected: ' + file)
pos = {start: 0}
}
try {
if (pos.start == -1) {
// there was no postion stored, let's start from the beginning
// throw new Error('File ' + file + ' does not exist.')
pos.start = 0
}
tail = new Tail(file, pos)
this.filesToWatch.push(tail)
this.fileNamesToWatch.push(file)
var context = {sourceName: file, startPos: pos}
tail.on('line', function (line) {
this.stats[file] = (this.stats[file] || 0) + 1
eventEmitter.emit('data.raw', line, context)
}.bind(this))
tail.once('error', function (error) {
var errMessage = 'ERROR tailing file ' + file + ': ' + error
logger.error(errMessage)
eventEmitter.emit('error.plugin.input.file', errMessage, {file: file, error: error})
}.bind(this))
logger.log('Watching file:' + file + ' from position: ' + pos.start)
return tail
} catch (error) {
// log('ERROR tailing file ' + file + ': ' + error)
return null
}
}