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stats.go
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/
stats.go
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package main
import (
"strconv"
"strings"
"sync/atomic"
"time"
"github.com/dgraph-io/badger/v2"
log "unknwon.dev/clog/v2"
)
// NOTE: all int64 must be manipulated atomically.
type stats struct {
totalView int64
totalGet int64
pkgsView map[string]*int64
pkgsGet map[string]*int64
lastUpdated int64
lastSynced int64
}
func (s *stats) TotalView() int64 {
return atomic.LoadInt64(&s.totalView)
}
func (s *stats) TotalGet() int64 {
return atomic.LoadInt64(&s.totalGet)
}
func (s *stats) PkgView(improtPath string) int64 {
return atomic.LoadInt64(s.pkgsView[improtPath])
}
func (s *stats) PkgGet(improtPath string) int64 {
return atomic.LoadInt64(s.pkgsGet[improtPath])
}
func (s *stats) PkgViewIncr(improtPath string, n int64) {
atomic.AddInt64(s.pkgsView[improtPath], n)
atomic.AddInt64(&s.totalView, n)
atomic.StoreInt64(&s.lastUpdated, time.Now().Unix())
}
func (s *stats) PkgGetIncr(improtPath string, n int64) {
atomic.AddInt64(s.pkgsGet[improtPath], n)
atomic.AddInt64(&s.totalGet, n)
atomic.StoreInt64(&s.lastUpdated, time.Now().Unix())
}
// NOTE: atomic operation is not needed in this method since it is currently only
// being called at init time.
func (s *stats) loadFromDB(db *badger.DB) error {
return db.View(func(tx *badger.Txn) error {
iter := tx.NewIterator(badger.DefaultIteratorOptions)
defer iter.Close()
for iter.Rewind(); iter.Valid(); iter.Next() {
item := iter.Item()
k := item.Key()
err := item.Value(func(v []byte) (err error) {
ks := string(k)
if ks == "view_total" {
s.totalView, _ = strconv.ParseInt(string(v), 10, 64)
return nil
} else if ks == "get_total" {
s.totalGet, _ = strconv.ParseInt(string(v), 10, 64)
return nil
}
if strings.HasPrefix(ks, "view_") {
importPath := strings.TrimPrefix(ks, "view_")
pkgView, _ := strconv.ParseInt(string(v), 10, 64)
s.pkgsView[importPath] = &pkgView
return nil
}
if strings.HasPrefix(ks, "get_") {
importPath := strings.TrimPrefix(ks, "get_")
pkgGet, _ := strconv.ParseInt(string(v), 10, 64)
s.pkgsGet[importPath] = &pkgGet
return nil
}
return nil
})
if err != nil {
return err
}
}
return nil
})
}
func (s *stats) start(db *badger.DB, done chan struct{}) {
defer func() {
log.Info("Exiting stats syncing goroutine...")
done <- struct{}{}
}()
t := time.NewTicker(time.Minute)
for {
select {
case <-t.C:
s.syncToDB(db)
case <-done:
s.syncToDB(db)
return
}
}
}
func (s *stats) syncToDB(db *badger.DB) {
lastSynced := atomic.LoadInt64(&s.lastSynced)
lastUpdated := atomic.LoadInt64(&s.lastUpdated)
if lastSynced == lastUpdated {
log.Trace("stats.syncToDB: nothing changed, DB is up-to-date")
return
}
err := db.Update(func(tx *badger.Txn) error {
err := tx.Set([]byte("view_total"), []byte(strconv.FormatInt(s.TotalView(), 10)))
if err != nil {
return err
}
err = tx.Set([]byte("get_total"), []byte(strconv.FormatInt(s.TotalGet(), 10)))
if err != nil {
return err
}
for p := range s.pkgsView {
err = tx.Set([]byte("view_"+p), []byte(strconv.FormatInt(s.PkgView(p), 10)))
if err != nil {
return err
}
err = tx.Set([]byte("get_"+p), []byte(strconv.FormatInt(s.PkgGet(p), 10)))
if err != nil {
return err
}
}
return nil
})
if err != nil {
log.Error("Failed to update DB: %v", err)
return
}
atomic.StoreInt64(&s.lastSynced, lastUpdated)
}