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file.go
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file.go
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// Input-plug: fileinput
// The plug's function is real-time monitoring of the specified file, once the data is
//updated to record the data.
package fileinput
import (
"bufio"
"bytes"
"encoding/json"
"errors"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
"time"
log "github.com/Sirupsen/logrus"
"github.com/fsnotify/fsnotify"
"github.com/wgliang/logcool/utils"
)
const (
ModuleName = "file"
)
var (
mapWatcher = map[string]*fsnotify.Watcher{}
)
type SinceDBInfo struct {
Offset int64 `json:"offset"`
}
// Define fileinput' config.
type InputConfig struct {
utils.InputConfig
DirsPath []string `json:"dirspath"`
FileType string `json:"filetype"`
StartPos string `json:"startpos"`
SincePath string `json:"sincepath"`
Intervals int `json:"intervals"`
hostname string
SinceDBInfos map[string]*SinceDBInfo
sinceLastInfos []byte
SinceLastSaveTime time.Time
}
func init() {
utils.RegistInputHandler(ModuleName, InitHandler)
}
// Init fileinput Handler.
func InitHandler(confraw *utils.ConfigRaw) (retconf utils.TypeInputConfig, err error) {
conf := InputConfig{
InputConfig: utils.InputConfig{
CommonConfig: utils.CommonConfig{
Type: ModuleName,
},
},
SinceDBInfos: map[string]*SinceDBInfo{},
}
if err = utils.ReflectConfig(confraw, &conf); err != nil {
return
}
// get hostname.
if conf.hostname, err = os.Hostname(); err != nil {
return
}
retconf = &conf
return
}
// Input's start,and this is the main function of input.
func (ic *InputConfig) Start() {
ic.Invoke(ic.monitor)
}
// load current since data.
func (ic *InputConfig) LoadSinceData() (err error) {
var (
raw []byte
)
log.Debug("LoadSinceDBInfos")
ic.SinceDBInfos = map[string]*SinceDBInfo{}
if ic.SincePath == "" || ic.SincePath == "/dev/null" {
log.Warnf("No valid sincedb path")
return
}
if _, err = os.Stat(ic.SincePath); err != nil {
log.Debugf("sincedb not found: %q", ic.SincePath)
return
}
if raw, err = ioutil.ReadFile(ic.SincePath); err != nil {
log.Errorf("Read sincedb failed: %q\n%s", ic.SincePath, err)
return
}
if err = json.Unmarshal(raw, &ic.SinceDBInfos); err != nil {
log.Errorf("Unmarshal sincedb failed: %q\n%s", ic.SincePath, err)
return
}
return
}
// save since data info.
func (ic *InputConfig) SaveSinceDBInfos() (err error) {
var (
raw []byte
)
log.Debug("SaveSinceDBInfos")
ic.SinceLastSaveTime = time.Now()
if ic.SincePath == "" || ic.SincePath == "/dev/null" {
log.Warnf("No valid sincedb path")
return
}
if raw, err = json.Marshal(ic.SinceDBInfos); err != nil {
log.Errorf("Marshal sincedb failed: %s", err)
return
}
ic.sinceLastInfos = raw
if err = ioutil.WriteFile(ic.SincePath, raw, 0664); err != nil {
log.Errorf("Write sincedb failed: %q\n%s", ic.SincePath, err)
return
}
return
}
// check since data info.
func (ic *InputConfig) CheckSaveSinceDBInfos() (err error) {
var (
raw []byte
)
if time.Since(ic.SinceLastSaveTime) > time.Duration(ic.Intervals)*time.Second {
if raw, err = json.Marshal(ic.SinceDBInfos); err != nil {
log.Errorf("Marshal sincedb failed: %s", err)
return
}
if bytes.Compare(raw, ic.sinceLastInfos) != 0 {
err = ic.SaveSinceDBInfos()
}
}
return
}
// load check save since data
func (ic *InputConfig) LoopCheckSaveSinceInfos() (err error) {
for {
time.Sleep(time.Duration(ic.Intervals) * time.Second)
if err = ic.CheckSaveSinceDBInfos(); err != nil {
return
}
}
}
func (ic *InputConfig) monitor(logger *log.Logger, inchan utils.InChan) (err error) {
defer func() {
if err != nil {
logger.Errorln(err)
}
}()
var (
matches = make([]string, 0)
fi os.FileInfo
)
if err = ic.LoadSinceData(); err != nil {
return
}
// load all files.
if len(ic.DirsPath) < 1 {
return
}
for _, dir := range ic.DirsPath {
var matche []string
matche, err = fileList(dir, ic.FileType)
if err != nil {
logger.Errorln(err)
}
matches = append(matches, matche...)
}
go ic.LoopCheckSaveSinceInfos()
for _, fpath := range matches {
// get all sysmlinks.
if fpath, err = filepath.EvalSymlinks(fpath); err != nil {
logger.Errorf("Get symlinks failed: %q\n%v", fpath, err)
continue
}
// check file status.
if fi, err = os.Stat(fpath); err != nil {
logger.Errorf("Stat(%q) failed\n%s", ic.DirsPath, err)
continue
}
// check file isDir?
if fi.IsDir() {
logger.Infof("Skipping directory: %q", ic.DirsPath)
continue
}
// monitor file.
readEventChan := make(chan fsnotify.Event, 10)
go ic.loopRead(readEventChan, fpath, logger, inchan)
go ic.loopWatch(readEventChan, fpath, fsnotify.Create|fsnotify.Write)
}
return
}
func (ic *InputConfig) loopRead(
readEventChan chan fsnotify.Event,
fpath string,
logger *log.Logger,
inchan utils.InChan,
) (err error) {
var (
since *SinceDBInfo
fp *os.File
truncated bool
ok bool
whence int
reader *bufio.Reader
line string
size int
buffer = &bytes.Buffer{}
)
if fpath, err = filepath.EvalSymlinks(fpath); err != nil {
logger.Errorf("Get symlinks failed: %q\n%v", fpath, err)
return
}
// if no path's since, add a null SinceDB.
if since, ok = ic.SinceDBInfos[fpath]; !ok {
ic.SinceDBInfos[fpath] = &SinceDBInfo{}
since = ic.SinceDBInfos[fpath]
}
// set or get offset index.
if since.Offset == 0 {
if ic.StartPos == "end" {
whence = os.SEEK_END // SEEK_END = 2
} else {
whence = os.SEEK_SET // SEEK_SET = 0
}
} else {
whence = os.SEEK_SET // SEEK_SET = 0
}
// open the file.
if fp, reader, err = openFile(fpath, since.Offset, whence); err != nil {
return
}
defer fp.Close()
// seek beginning.
if truncated, err = isTruncated(fp, since); err != nil {
return
}
if truncated {
logger.Warnf("File truncated, seeking to beginning: %q", fpath)
since.Offset = 0
if _, err = fp.Seek(since.Offset, os.SEEK_SET); err != nil {
logger.Errorf("seek file failed: %q", fpath)
return
}
}
// load all data.
for {
if line, size, err = readLine(reader, buffer); err != nil {
if err == io.EOF {
watchev := <-readEventChan
logger.Debug("loopRead recv:", watchev)
if watchev.Op&fsnotify.Create == fsnotify.Create {
logger.Warnf("File recreated, seeking to beginning: %q", fpath)
fp.Close()
since.Offset = 0
if fp, reader, err = openFile(fpath, since.Offset, os.SEEK_SET); err != nil {
return
}
}
if truncated, err = isTruncated(fp, since); err != nil {
return
}
if truncated {
logger.Warnf("File truncated, seeking to beginning: %q", fpath)
since.Offset = 0
if _, err = fp.Seek(since.Offset, os.SEEK_SET); err != nil {
logger.Errorf("seek file failed: %q", fpath)
return
}
continue
}
logger.Debugf("watch %q %q %v", watchev.Name, fpath, watchev)
continue
} else {
return
}
}
event := utils.LogEvent{
Timestamp: time.Now(),
Message: line,
Extra: map[string]interface{}{
"host": ic.hostname,
"path": fpath,
"offset": since.Offset,
},
}
since.Offset += int64(size)
logger.Debugf("%q %v", event.Message, event)
inchan <- event
ic.CheckSaveSinceDBInfos()
}
}
func (ic *InputConfig) loopWatch(readEventChan chan fsnotify.Event, fpath string, op fsnotify.Op) (err error) {
var (
event fsnotify.Event
)
for {
if event, err = waitWatchEvent(fpath, op); err != nil {
return
}
readEventChan <- event
}
}
func isTruncated(fp *os.File, since *SinceDBInfo) (truncated bool, err error) {
var (
fi os.FileInfo
)
if fi, err = fp.Stat(); err != nil {
return
}
if fi.Size() < since.Offset {
truncated = true
} else {
truncated = false
}
return
}
func openFile(fpath string, offset int64, whence int) (fp *os.File, reader *bufio.Reader, err error) {
if fp, err = os.Open(fpath); err != nil {
return
}
if _, err = fp.Seek(offset, whence); err != nil {
err = errors.New("seek file failed: " + fpath)
return
}
reader = bufio.NewReaderSize(fp, 16*1024)
return
}
func readLine(reader *bufio.Reader, buffer *bytes.Buffer) (line string, size int, err error) {
var (
segment []byte
)
for {
if segment, err = reader.ReadBytes('\n'); err != nil {
if err != io.EOF {
err = errors.New("read line failed")
}
return
}
if _, err = buffer.Write(segment); err != nil {
return
}
if len(segment) < 1 {
time.Sleep(1 * time.Second)
} else {
if segment[len(segment)-1] != '\n' {
time.Sleep(1 * time.Second)
} else {
size = buffer.Len()
line = buffer.String()
buffer.Reset()
line = strings.TrimRight(line, "\r\n")
return
}
}
}
}
func waitWatchEvent(fpath string, op fsnotify.Op) (event fsnotify.Event, err error) {
var (
fdir string
watcher *fsnotify.Watcher
ok bool
)
if fpath, err = filepath.EvalSymlinks(fpath); err != nil {
err = errors.New("Get symlinks failed: " + fpath)
return
}
fdir = filepath.Dir(fpath)
if watcher, ok = mapWatcher[fdir]; !ok {
if watcher, err = fsnotify.NewWatcher(); err != nil {
err = errors.New("create new watcher failed: " + fdir)
return
}
mapWatcher[fdir] = watcher
if err = watcher.Add(fdir); err != nil {
err = errors.New("add new watch path failed: " + fdir)
return
}
}
for {
select {
case event = <-watcher.Events:
if event.Name == fpath {
if op > 0 {
if event.Op&op > 0 {
return
}
} else {
return
}
}
case err = <-watcher.Errors:
err = errors.New("watcher error")
return
}
}
}
// list all config templates.
func fileList(dirPath string, suffix string) (files []string, err error) {
files = make([]string, 0, 10)
dir, err := ioutil.ReadDir(dirPath)
if err != nil {
return nil, err
}
PthSep := string(os.PathSeparator)
suffix = strings.ToUpper(suffix)
for _, fi := range dir {
if fi.IsDir() {
continue
}
if strings.HasSuffix(strings.ToUpper(fi.Name()), suffix) {
files = append(files, dirPath+PthSep+fi.Name())
}
}
return files, nil
}