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Web UI -- persistent stats by writing them into stats.json at exit

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This commit is contained in:
Eugene Bujak 2018-10-04 02:17:37 +03:00
parent c6eabb5b67
commit 51ec58b0ce
4 changed files with 125 additions and 56 deletions
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18
app.go
View file

@ -6,6 +6,7 @@ import (
"net"
"net/http"
"os"
"os/signal"
"path/filepath"
"strconv"
@ -15,7 +16,12 @@ import (
// VersionString will be set through ldflags, contains current version
var VersionString = "undefined"
func cleanup() {
writeStats()
}
func main() {
c := make(chan os.Signal, 1)
log.Printf("AdGuard DNS web interface backend, version %s\n", VersionString)
box := packr.NewBox("build/static")
{
@ -114,6 +120,18 @@ func main() {
log.Fatal(err)
}
err = loadStats()
if err != nil {
log.Fatal(err)
}
signal.Notify(c, os.Interrupt)
go func() {
<-c
cleanup()
os.Exit(1)
}()
address := net.JoinHostPort(config.BindHost, strconv.Itoa(config.BindPort))
runStatsCollectors()

10
control.go
View file

@ -217,7 +217,7 @@ func handleStatus(w http.ResponseWriter, r *http.Request) {
// stats
// -----
func handleStats(w http.ResponseWriter, r *http.Request) {
histrical := generateMapFromStats(&statistics.perHour, 0, 24)
histrical := generateMapFromStats(&statistics.PerHour, 0, 24)
// sum them up
summed := map[string]interface{}{}
for key, values := range histrical {
@ -259,16 +259,16 @@ func handleStatsHistory(w http.ResponseWriter, r *http.Request) {
switch timeUnitString {
case "seconds":
timeUnit = time.Second
stats = &statistics.perSecond
stats = &statistics.PerSecond
case "minutes":
timeUnit = time.Minute
stats = &statistics.perMinute
stats = &statistics.PerMinute
case "hours":
timeUnit = time.Hour
stats = &statistics.perHour
stats = &statistics.PerHour
case "days":
timeUnit = time.Hour * 24
stats = &statistics.perDay
stats = &statistics.PerDay
default:
http.Error(w, "Must specify valid time_unit parameter", 400)
return

14
helpers.go
View file

@ -111,8 +111,8 @@ func generateMapFromStats(stats *periodicStats, start int, end int) map[string]i
avgProcessingTime := make([]float64, 0)
count := getReversedSlice(stats.entries[processingTimeCount], start, end)
sum := getReversedSlice(stats.entries[processingTimeSum], start, end)
count := getReversedSlice(stats.Entries[processingTimeCount], start, end)
sum := getReversedSlice(stats.Entries[processingTimeSum], start, end)
for i := 0; i < len(count); i++ {
var avg float64
if count[i] != 0 {
@ -123,11 +123,11 @@ func generateMapFromStats(stats *periodicStats, start int, end int) map[string]i
}
result := map[string]interface{}{
"dns_queries": getReversedSlice(stats.entries[totalRequests], start, end),
"blocked_filtering": getReversedSlice(stats.entries[filteredTotal], start, end),
"replaced_safebrowsing": getReversedSlice(stats.entries[filteredSafebrowsing], start, end),
"replaced_safesearch": getReversedSlice(stats.entries[filteredSafesearch], start, end),
"replaced_parental": getReversedSlice(stats.entries[filteredParental], start, end),
"dns_queries": getReversedSlice(stats.Entries[totalRequests], start, end),
"blocked_filtering": getReversedSlice(stats.Entries[filteredTotal], start, end),
"replaced_safebrowsing": getReversedSlice(stats.Entries[filteredSafebrowsing], start, end),
"replaced_safesearch": getReversedSlice(stats.Entries[filteredSafesearch], start, end),
"replaced_parental": getReversedSlice(stats.Entries[filteredParental], start, end),
"avg_processing_time": avgProcessingTime,
}
return result

139
stats.go
View file

@ -2,12 +2,14 @@ package main
import (
"bufio"
"encoding/json"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"
"syscall"
@ -33,31 +35,41 @@ const (
processingTimeCount = `coredns_dns_request_duration_seconds_count`
)
var entryWhiteList = map[string]bool{
totalRequests: true,
filteredTotal: true,
filteredSafebrowsing: true,
filteredSafesearch: true,
filteredParental: true,
processingTimeSum: true,
processingTimeCount: true,
}
type periodicStats struct {
entries statsEntries
lastRotate time.Time // last time this data was rotated
Entries statsEntries
LastRotate time.Time // last time this data was rotated
}
type stats struct {
perSecond periodicStats
perMinute periodicStats
perHour periodicStats
perDay periodicStats
PerSecond periodicStats
PerMinute periodicStats
PerHour periodicStats
PerDay periodicStats
lastSeen statsEntry
LastSeen statsEntry
}
var statistics stats
func initPeriodicStats(periodic *periodicStats) {
periodic.entries = statsEntries{}
periodic.Entries = statsEntries{}
}
func init() {
initPeriodicStats(&statistics.perSecond)
initPeriodicStats(&statistics.perMinute)
initPeriodicStats(&statistics.perHour)
initPeriodicStats(&statistics.perDay)
initPeriodicStats(&statistics.PerSecond)
initPeriodicStats(&statistics.PerMinute)
initPeriodicStats(&statistics.PerHour)
initPeriodicStats(&statistics.PerDay)
}
func runStatsCollectors() {
@ -85,37 +97,29 @@ func isConnRefused(err error) bool {
return false
}
func statsRotate(periodic *periodicStats, now time.Time) {
for key, values := range periodic.entries {
newValues := [statsHistoryElements]float64{}
for i := 1; i < len(values); i++ {
newValues[i] = values[i-1]
func statsRotate(periodic *periodicStats, now time.Time, rotations int64) {
// calculate how many times we should rotate
for r := int64(0); r < rotations; r++ {
for key, values := range periodic.Entries {
newValues := [statsHistoryElements]float64{}
for i := 1; i < len(values); i++ {
newValues[i] = values[i-1]
}
periodic.Entries[key] = newValues
}
periodic.entries[key] = newValues
}
periodic.lastRotate = now
if rotations > 0 {
periodic.LastRotate = now
}
}
// called every second, accumulates stats for each second, minute, hour and day
func collectStats() {
now := time.Now()
// rotate each second
// NOTE: since we are called every second, always rotate perSecond, otherwise aliasing problems cause the rotation to skip
if true {
statsRotate(&statistics.perSecond, now)
}
// if minute elapsed, rotate
if now.Sub(statistics.perMinute.lastRotate).Minutes() >= 1 {
statsRotate(&statistics.perMinute, now)
}
// if hour elapsed, rotate
if now.Sub(statistics.perHour.lastRotate).Hours() >= 1 {
statsRotate(&statistics.perHour, now)
}
// if day elapsed, rotate
if now.Sub(statistics.perDay.lastRotate).Hours()/24.0 >= 1 {
statsRotate(&statistics.perDay, now)
}
statsRotate(&statistics.PerSecond, now, int64(now.Sub(statistics.PerSecond.LastRotate)/time.Second))
statsRotate(&statistics.PerMinute, now, int64(now.Sub(statistics.PerMinute.LastRotate)/time.Minute))
statsRotate(&statistics.PerHour, now, int64(now.Sub(statistics.PerHour.LastRotate)/time.Hour))
statsRotate(&statistics.PerDay, now, int64(now.Sub(statistics.PerDay.LastRotate)/time.Hour/24))
// grab HTTP from prometheus
resp, err := client.Get("http://127.0.0.1:9153/metrics")
@ -169,6 +173,11 @@ func collectStats() {
continue
}
// keys not in whitelist are not ok
if entryWhiteList[key] == false {
continue
}
got, ok := entry[key]
if ok {
value += got
@ -177,16 +186,16 @@ func collectStats() {
}
// calculate delta
delta := calcDelta(entry, statistics.lastSeen)
delta := calcDelta(entry, statistics.LastSeen)
// apply delta to second/minute/hour/day
applyDelta(&statistics.perSecond, delta)
applyDelta(&statistics.perMinute, delta)
applyDelta(&statistics.perHour, delta)
applyDelta(&statistics.perDay, delta)
applyDelta(&statistics.PerSecond, delta)
applyDelta(&statistics.PerMinute, delta)
applyDelta(&statistics.PerHour, delta)
applyDelta(&statistics.PerDay, delta)
// save last seen
statistics.lastSeen = entry
statistics.LastSeen = entry
}
func calcDelta(current, seen statsEntry) statsEntry {
@ -201,8 +210,50 @@ func calcDelta(current, seen statsEntry) statsEntry {
func applyDelta(current *periodicStats, delta statsEntry) {
for key, deltaValue := range delta {
currentValues := current.entries[key]
currentValues := current.Entries[key]
currentValues[0] += deltaValue
current.entries[key] = currentValues
current.Entries[key] = currentValues
}
}
func loadStats() error {
statsFile := filepath.Join(config.ourBinaryDir, "stats.json")
if _, err := os.Stat(statsFile); os.IsNotExist(err) {
log.Printf("Stats JSON does not exist, skipping: %s", statsFile)
return nil
}
log.Printf("Loading JSON stats: %s", statsFile)
jsonText, err := ioutil.ReadFile(statsFile)
if err != nil {
log.Printf("Couldn't read JSON stats: %s", err)
return err
}
err = json.Unmarshal(jsonText, &statistics)
if err != nil {
log.Printf("Couldn't parse JSON stats: %s", err)
return err
}
return nil
}
func writeStats() error {
statsFile := filepath.Join(config.ourBinaryDir, "stats.json")
log.Printf("Writing JSON file: %s", statsFile)
json, err := json.MarshalIndent(statistics, "", " ")
if err != nil {
log.Printf("Couldn't generate JSON: %s", err)
return err
}
err = ioutil.WriteFile(statsFile+".tmp", json, 0644)
if err != nil {
log.Printf("Couldn't write stats in JSON: %s", err)
return err
}
err = os.Rename(statsFile+".tmp", statsFile)
if err != nil {
log.Printf("Couldn't rename stats JSON: %s", err)
return err
}
return nil
}