/
file.go
89 lines (72 loc) · 1.59 KB
/
file.go
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package feeders
import (
"fmt"
"io"
"os"
"github.com/Matrix86/driplane/data"
"github.com/evilsocket/islazy/log"
"github.com/hpcloud/tail"
)
// File is a Feeder that creates a stream from a file
type File struct {
Base
filename string
lastLines bool
fp *tail.Tail
}
// NewFileFeeder is the registered method to instantiate a FileFeeder
func NewFileFeeder(conf map[string]string) (Feeder, error) {
f := &File{
lastLines: false,
}
if val, ok := conf["file.filename"]; ok {
f.filename = val
}
if val, ok := conf["file.toend"]; ok && val == "true" {
f.lastLines = true
}
info, err := os.Stat(f.filename)
if os.IsNotExist(err) || info.IsDir() {
return nil, fmt.Errorf("file '%s' does not exist", f.filename)
}
seek := tail.SeekInfo{
Offset: 0,
Whence: io.SeekStart,
}
if f.lastLines {
seek.Offset = info.Size()
}
f.fp, err = tail.TailFile(f.filename, tail.Config{
Logger: tail.DiscardingLogger,
Follow: true,
Location: &seek,
})
if err != nil {
return nil, err
}
return f, nil
}
// Start propagates a message every time a new line is read
func (f *File) Start() {
go func() {
for line := range f.fp.Lines {
msg := data.NewMessage(line.Text)
msg.SetExtra("file_name", f.filename)
f.Propagate(msg)
}
}()
f.isRunning = true
}
// Stop handles the Feeder shutdown
func (f *File) Stop() {
log.Debug("feeder '%s' stream stop", f.Name())
f.fp.Stop()
f.fp.Cleanup()
f.isRunning = false
}
// OnEvent is called when an event occurs
func (f *File) OnEvent(event *data.Event) {}
// Auto factory adding
func init() {
register("file", NewFileFeeder)
}