mirror of
https://github.com/openziti/zrok.git
synced 2024-11-25 01:23:49 +01:00
101 lines
2.3 KiB
Go
101 lines
2.3 KiB
Go
package metrics
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import (
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"encoding/binary"
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"encoding/json"
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"github.com/michaelquigley/cf"
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"github.com/nxadm/tail"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"os"
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)
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type FileSourceConfig struct {
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Path string
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DataPath string
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}
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func loadFileSourceConfig(v interface{}, opts *cf.Options) (interface{}, error) {
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if submap, ok := v.(map[string]interface{}); ok {
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cfg := &FileSourceConfig{}
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if err := cf.Bind(cfg, submap, cf.DefaultOptions()); err != nil {
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return nil, err
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}
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return &fileSource{cfg: cfg}, nil
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}
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return nil, errors.New("invalid config structure for 'file' source")
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}
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type fileSource struct {
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cfg *FileSourceConfig
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t *tail.Tail
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}
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func (s *fileSource) Start(events chan map[string]interface{}) (join chan struct{}, err error) {
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f, err := os.Open(s.cfg.Path)
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if err != nil {
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return nil, errors.Wrapf(err, "error opening '%v'", s.cfg.Path)
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}
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_ = f.Close()
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idxPath := s.cfg.Path + ".idx"
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idxF, err := os.OpenFile(idxPath, os.O_CREATE|os.O_RDWR, os.ModePerm)
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if err != nil {
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return nil, errors.Wrapf(err, "error opening '%v'", idxPath)
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}
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pos := int64(0)
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posBuf := make([]byte, 8)
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if n, err := idxF.Read(posBuf); err == nil && n == 8 {
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pos = int64(binary.LittleEndian.Uint64(posBuf))
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logrus.Infof("recovered stored position: %d", pos)
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}
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join = make(chan struct{})
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go func() {
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s.tail(pos, events, idxF)
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close(join)
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}()
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return join, nil
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}
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func (s *fileSource) Stop() {
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if err := s.t.Stop(); err != nil {
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logrus.Error(err)
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}
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}
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func (s *fileSource) tail(pos int64, events chan map[string]interface{}, idxF *os.File) {
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logrus.Infof("started")
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defer logrus.Infof("stopped")
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posBuf := make([]byte, 8)
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var err error
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s.t, err = tail.TailFile(s.cfg.Path, tail.Config{
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ReOpen: true,
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Follow: true,
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Location: &tail.SeekInfo{Offset: pos},
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})
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if err != nil {
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logrus.Error(err)
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return
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}
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for line := range s.t.Lines {
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event := make(map[string]interface{})
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if err := json.Unmarshal([]byte(line.Text), &event); err == nil {
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binary.LittleEndian.PutUint64(posBuf, uint64(line.SeekInfo.Offset))
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if n, err := idxF.Seek(0, 0); err == nil && n == 0 {
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if n, err := idxF.Write(posBuf); err != nil || n != 8 {
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logrus.Errorf("error writing index (%d): %v", n, err)
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}
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}
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events <- event
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} else {
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logrus.Errorf("error parsing line #%d: %v", line.Num, err)
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}
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}
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}
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