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Remove dead code

This commit is contained in:
Eugene Bujak 2018-10-10 15:47:08 +03:00
parent 945bd24f67
commit 903b20dcab
4 changed files with 31 additions and 351 deletions
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30
app.go
View File

@ -6,10 +6,8 @@ import (
"net"
"net/http"
"os"
"os/signal"
"path/filepath"
"strconv"
"time"
"github.com/gobuffalo/packr"
)
@ -17,12 +15,7 @@ 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")
{
@ -121,31 +114,8 @@ 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)
}()
go func() {
for range time.Tick(time.Hour * 24) {
err := writeStats()
if err != nil {
log.Printf("Couldn't write stats: %s", err)
// try later on next iteration, don't abort
}
}
}()
address := net.JoinHostPort(config.BindHost, strconv.Itoa(config.BindPort))
runStatsCollectors()
runFilterRefreshers()
http.Handle("/", optionalAuthHandler(http.FileServer(box)))

35
control.go
View File

@ -35,6 +35,10 @@ var versionCheckLastTime time.Time
const versionCheckURL = "https://adguardteam.github.io/AdguardDNS/version.json"
const versionCheckPeriod = time.Hour * 8
var client = &http.Client{
Timeout: time.Second * 30,
}
// -------------------
// coredns run control
// -------------------
@ -360,13 +364,36 @@ func handleQueryLogDisable(w http.ResponseWriter, r *http.Request) {
}
func handleStatsReset(w http.ResponseWriter, r *http.Request) {
purgeStats()
_, err := fmt.Fprintf(w, "OK\n")
resp, err := client.Post("http://127.0.0.1:8618/stats_reset", "text/plain", nil)
if err != nil {
httpError(w, http.StatusInternalServerError, "Couldn't write body: %s", err)
errortext := fmt.Sprintf("Couldn't get stats_top from coredns: %T %s\n", err, err)
log.Println(errortext)
http.Error(w, errortext, http.StatusBadGateway)
return
}
if resp != nil && resp.Body != nil {
defer resp.Body.Close()
}
// read the body entirely
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
errortext := fmt.Sprintf("Couldn't read response body: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusBadGateway)
return
}
// forward body entirely with status code
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Content-Length", strconv.Itoa(len(body)))
w.WriteHeader(resp.StatusCode)
_, err = w.Write(body)
if err != nil {
errortext := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusInternalServerError)
}
}
func handleStatsTop(w http.ResponseWriter, r *http.Request) {

40
helpers.go
View File

@ -91,46 +91,6 @@ func optionalAuthHandler(handler http.Handler) http.Handler {
return &authHandler{handler}
}
// --------------------------
// helper functions for stats
// --------------------------
func getReversedSlice(input [statsHistoryElements]float64, start int, end int) []float64 {
output := make([]float64, 0)
for i := start; i <= end; i++ {
output = append([]float64{input[i]}, output...)
}
return output
}
func generateMapFromStats(stats *periodicStats, start int, end int) map[string]interface{} {
// clamp
start = clamp(start, 0, statsHistoryElements)
end = clamp(end, 0, statsHistoryElements)
avgProcessingTime := make([]float64, 0)
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 {
avg = sum[i] / count[i]
avg *= 1000
}
avgProcessingTime = append(avgProcessingTime, avg)
}
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),
"avg_processing_time": avgProcessingTime,
}
return result
}
// -------------------------------------------------
// helper functions for parsing parameters from body
// -------------------------------------------------

277
stats.go
View File

@ -1,277 +0,0 @@
package main
import (
"bufio"
"encoding/json"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"syscall"
"time"
)
var client = &http.Client{
Timeout: time.Second * 30,
}
// as seen over HTTP
type statsEntry map[string]float64
type statsEntries map[string][statsHistoryElements]float64
const (
statsHistoryElements = 60 + 1 // +1 for calculating delta
totalRequests = `coredns_dns_request_count_total`
filteredTotal = `coredns_dnsfilter_filtered_total`
filteredSafebrowsing = `coredns_dnsfilter_filtered_safebrowsing_total`
filteredSafesearch = `coredns_dnsfilter_safesearch_total`
filteredParental = `coredns_dnsfilter_filtered_parental_total`
processingTimeSum = `coredns_dns_request_duration_seconds_sum`
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
}
type stats struct {
PerSecond periodicStats
PerMinute periodicStats
PerHour periodicStats
PerDay periodicStats
LastSeen statsEntry
sync.RWMutex
}
var statistics stats
func initPeriodicStats(periodic *periodicStats) {
periodic.Entries = statsEntries{}
periodic.LastRotate = time.Time{}
}
func init() {
purgeStats()
}
func purgeStats() {
statistics.Lock()
initPeriodicStats(&statistics.PerSecond)
initPeriodicStats(&statistics.PerMinute)
initPeriodicStats(&statistics.PerHour)
initPeriodicStats(&statistics.PerDay)
statistics.Unlock()
}
func runStatsCollectors() {
go statsCollector(time.Second)
}
func statsCollector(t time.Duration) {
for range time.Tick(t) {
collectStats()
}
}
func isConnRefused(err error) bool {
if err != nil {
if uerr, ok := err.(*url.Error); ok {
if noerr, ok := uerr.Err.(*net.OpError); ok {
if scerr, ok := noerr.Err.(*os.SyscallError); ok {
if scerr.Err == syscall.ECONNREFUSED {
return true
}
}
}
}
}
return false
}
func statsRotate(periodic *periodicStats, now time.Time, rotations int64) {
if rotations > statsHistoryElements {
rotations = statsHistoryElements
}
// 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
}
}
if rotations > 0 {
periodic.LastRotate = now
}
}
// called every second, accumulates stats for each second, minute, hour and day
func collectStats() {
now := time.Now()
statistics.Lock()
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))
statistics.Unlock()
// grab HTTP from prometheus
resp, err := client.Get("http://127.0.0.1:9153/metrics")
if resp != nil && resp.Body != nil {
defer resp.Body.Close()
}
if err != nil {
if isConnRefused(err) {
return
}
log.Printf("Couldn't get coredns metrics: %T %s\n", err, err)
return
}
// read the body entirely
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Println("Couldn't read response body:", err)
return
}
entry := statsEntry{}
// handle body
scanner := bufio.NewScanner(strings.NewReader(string(body)))
for scanner.Scan() {
line := scanner.Text()
// ignore comments
if line[0] == '#' {
continue
}
splitted := strings.Split(line, " ")
if len(splitted) < 2 {
continue
}
value, err := strconv.ParseFloat(splitted[1], 64)
if err != nil {
log.Printf("Failed to parse number input %s: %s", splitted[1], err)
continue
}
key := splitted[0]
index := strings.IndexByte(key, '{')
if index >= 0 {
key = key[:index]
}
// empty keys are not ok
if key == "" {
continue
}
// keys not in whitelist are not ok
if entryWhiteList[key] == false {
continue
}
got, ok := entry[key]
if ok {
value += got
}
entry[key] = value
}
// calculate delta
statistics.Lock()
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)
// save last seen
statistics.LastSeen = entry
statistics.Unlock()
}
func calcDelta(current, seen statsEntry) statsEntry {
delta := statsEntry{}
for key, currentValue := range current {
seenValue := seen[key]
deltaValue := currentValue - seenValue
delta[key] = deltaValue
}
return delta
}
func applyDelta(current *periodicStats, delta statsEntry) {
for key, deltaValue := range delta {
currentValues := current.Entries[key]
currentValues[0] += deltaValue
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)
statistics.RLock()
json, err := json.MarshalIndent(&statistics, "", " ")
statistics.RUnlock()
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
}