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// Copyright (c) 2014-2019 Ludovic Fauvet
// Licensed under the MIT license
package http
import (
"errors"
"fmt"
"strconv"
"strings"
"sync"
"time"
"github.com/etix/mirrorbits/database"
"github.com/etix/mirrorbits/filesystem"
"github.com/etix/mirrorbits/mirrors"
)
/*
Total (all files, all mirrors):
STATS_TOTAL
List of hashes for a file:
STATS_FILE = path -> value All time
STATS_FILE_[year] = path -> value By year
STATS_FILE_[year]_[month] = path -> value By month
STATS_FILE_[year]_[month]_[day] = path -> value By day
List of hashes for a mirror:
STATS_MIRROR = mirror -> value All time
STATS_MIRROR_[year] = mirror -> value By year
STATS_MIRROR_[year]_[month] = mirror -> value By month
STATS_MIRROR_[year]_[month]_[day] = mirror -> value By day
*/
var (
errEmptyFileError = errors.New("stats: file parameter is empty")
errUnknownMirror = errors.New("stats: unknown mirror")
)
// Stats is the internal structure for the download stats
type Stats struct {
r *database.Redis
countChan chan countItem
mapStats map[string]int64
stop chan bool
wg sync.WaitGroup
downgraded bool
}
type countItem struct {
mirrorID int
filepath string
size int64
time time.Time
}
// NewStats returns an instance of the stats counter
func NewStats(redis *database.Redis) *Stats {
s := &Stats{
r: redis,
countChan: make(chan countItem, 1000),
mapStats: make(map[string]int64),
stop: make(chan bool),
}
go s.processCountDownload()
return s
}
// Terminate stops the stats handler and commit results to the database
func (s *Stats) Terminate() {
close(s.stop)
log.Notice("Saving stats")
s.wg.Wait()
}
// CountDownload is a lightweight method used to count a new download for a specific file and mirror
func (s *Stats) CountDownload(m mirrors.Mirror, fileinfo filesystem.FileInfo) error {
if m.Name == "" {
return errUnknownMirror
}
if fileinfo.Path == "" {
return errEmptyFileError
}
s.countChan <- countItem{m.ID, fileinfo.Path, fileinfo.Size, time.Now().UTC()}
return nil
}
// Process all stacked download messages
func (s *Stats) processCountDownload() {
s.wg.Add(1)
pushTicker := time.NewTicker(500 * time.Millisecond)
for {
select {
case <-s.stop:
s.pushStats()
s.wg.Done()
return
case c := <-s.countChan:
date := c.time.Format("2006_01_02|") // Includes separator
s.mapStats["f"+date+c.filepath]++
s.mapStats["m"+date+strconv.Itoa(c.mirrorID)]++
s.mapStats["s"+date+strconv.Itoa(c.mirrorID)] += c.size
case <-pushTicker.C:
s.pushStats()
}
}
}
// Push the resulting stats on redis
func (s *Stats) pushStats() {
if len(s.mapStats) <= 0 {
return
}
rconn := s.r.Get()
defer rconn.Close()
if rconn.Err() != nil {
if s.downgraded == false {
log.Warningf("Uncommited stats kept in-memory: %v", rconn.Err())
}
s.downgraded = true
return
}
rconn.Send("MULTI")
for k, v := range s.mapStats {
if v == 0 {
continue
}
separator := strings.Index(k, "|")
if separator <= 0 {
log.Critical("Stats: separator not found")
continue
}
typ := k[:1]
date := k[1:separator]
object := k[separator+1:]
if typ == "f" {
// File
fkey := fmt.Sprintf("STATS_FILE_%s", date)
for i := 0; i < 4; i++ {
rconn.Send("HINCRBY", fkey, object, v)
fkey = fkey[:strings.LastIndex(fkey, "_")]
}
// Increase the total too
rconn.Send("INCRBY", "STATS_TOTAL", v)
} else if typ == "m" {
// Mirror
mkey := fmt.Sprintf("STATS_MIRROR_%s", date)
for i := 0; i < 4; i++ {
rconn.Send("HINCRBY", mkey, object, v)
mkey = mkey[:strings.LastIndex(mkey, "_")]
}
} else if typ == "s" {
// Bytes
mkey := fmt.Sprintf("STATS_MIRROR_BYTES_%s", date)
for i := 0; i < 4; i++ {
rconn.Send("HINCRBY", mkey, object, v)
mkey = mkey[:strings.LastIndex(mkey, "_")]
}
} else {
log.Warning("Stats: unknown type", typ)
}
}
_, err := rconn.Do("EXEC")
if err != nil {
log.Errorf("Stats: could not save stats to redis: %s", err.Error())
return
}
s.downgraded = false
// Clear the map
s.mapStats = make(map[string]int64)
}
|
