reader/sql: improve status check and implement DaemonReader

Author: unknwon

reader/meta.go

@@ -9,6 +9,7 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/json-iterator/go"
@@ -71,7 +72,8 @@ type Meta struct {
 	RunnerName        string
 	extrainfo         map[string]string
 
-	subMetas map[string]*Meta //对于tailx模式的情况会有嵌套的meta
+	subMetaLock sync.RWMutex
+	subMetas    map[string]*Meta //对于tailx模式的情况会有嵌套的meta
 }
 
 func getValidDir(dir string) (realPath string, err error) {
@@ -195,6 +197,9 @@ func NewMetaWithConf(conf conf.MapConf) (meta *Meta, err error) {
 }
 
 func (m *Meta) AddSubMeta(key string, meta *Meta) error {
+	m.subMetaLock.Lock()
+	defer m.subMetaLock.Unlock()
+
 	if m.subMetas == nil {
 		m.subMetas = make(map[string]*Meta)
 	}
@@ -206,6 +211,9 @@ func (m *Meta) AddSubMeta(key string, meta *Meta) error {
 }
 
 func (m *Meta) RemoveSubMeta(key string) {
+	m.subMetaLock.Lock()
+	defer m.subMetaLock.Unlock()
+
 	delete(m.subMetas, key)
 }
 
@@ -547,7 +555,11 @@ func (m *Meta) GetDoneFiles() ([]File, error) {
 	if err != nil {
 		return nil, err
 	}
+
 	//submeta
+	m.subMetaLock.RLock()
+	defer m.subMetaLock.RUnlock()
+
 	for _, mv := range m.subMetas {
 		newfiles, err := mv.GetDoneFiles()
 		if err != nil {
@@ -588,6 +600,10 @@ func (m *Meta) SetEncodingWay(e string) {
 	if e != "UTF-8" {
 		m.encodingWay = e
 	}
+
+	m.subMetaLock.RLock()
+	defer m.subMetaLock.RUnlock()
+
 	for _, mv := range m.subMetas {
 		mv.SetEncodingWay(e)
 	}
@@ -644,6 +660,10 @@ func (m *Meta) Reset() error {
 			}
 		}
 	}
+
+	m.subMetaLock.RLock()
+	defer m.subMetaLock.RUnlock()
+
 	for key, mv := range m.subMetas {
 		err := mv.Reset()
 		if err != nil {