Merge pull request #8 in DNS/adguard-dns from parental_metrics to master

* commit '9682dc6bc19ea940cf71911f6281450c7027eb16':
  travis -- npm installation of dependencies belongs in install section
  makefile -- use npm --prefix syntax instead of doing cd into subdir
  travis -- don't use slow master or tip builds, just specify 1.x for latest go version
  travis -- move dependency installation to install section, simplify go test invocation to test all subdirs in one go
  dnsfilter -- small code cleanup
  coredns plugin metrics -- deduplicate code
  dnsfilter metrics -- parental cache hits were counted as safebrowsing cache hits

.travis.yml

@@ -3,15 +3,17 @@ sudo: false
 go:
   - 1.10.x
   - 1.11.x
-  - master
-  - tip
+  - 1.x
 
 os:
   - linux
   - osx
 
-script:
-  - cd dnsfilter && go get -d -t . && go test
-  - cd ../coredns_plugin && go get -d -t . && go test
-  - cd .. && make
+install:
+  - go get -d -t ./...
+  - npm --prefix client install
+
+script:
+  - go test ./...
+  - make
 

Makefile

@@ -12,8 +12,8 @@ all: build
 build: AdguardDNS coredns
 
 $(STATIC):
-	cd client; npm install
-	cd client; npm run build-prod
+	npm --prefix client install
+	npm --prefix client run build-prod
 
 AdguardDNS: $(STATIC) *.go
 	echo mkfile_dir = $(mkfile_dir)

coredns_plugin/coredns_plugin.go

@@ -261,16 +261,17 @@ func gen(ch interface{}, doFunc statsFunc, name string, text string, value float
 	doFunc(ch, name, text, value, valueType)
 }
 
+func doStatsLookup(ch interface{}, doFunc statsFunc, name string, lookupstats *dnsfilter.LookupStats) {
+	gen(ch, doFunc, fmt.Sprintf("coredns_dnsfilter_%s_requests", name), fmt.Sprintf("Number of %s HTTP requests that were sent", name), float64(lookupstats.Requests), prometheus.CounterValue)
+	gen(ch, doFunc, fmt.Sprintf("coredns_dnsfilter_%s_cachehits", name), fmt.Sprintf("Number of %s lookups that didn't need HTTP requests", name), float64(lookupstats.CacheHits), prometheus.CounterValue)
+	gen(ch, doFunc, fmt.Sprintf("coredns_dnsfilter_%s_pending", name), fmt.Sprintf("Number of currently pending %s HTTP requests", name), float64(lookupstats.Pending), prometheus.GaugeValue)
+	gen(ch, doFunc, fmt.Sprintf("coredns_dnsfilter_%s_pending_max", name), fmt.Sprintf("Maximum number of pending %s HTTP requests", name), float64(lookupstats.PendingMax), prometheus.GaugeValue)
+}
+
 func (d *Plugin) doStats(ch interface{}, doFunc statsFunc) {
 	stats := d.d.GetStats()
-	gen(ch, doFunc, "coredns_dnsfilter_safebrowsing_requests", "Number of safebrowsing HTTP requests that were sent", float64(stats.Safebrowsing.Requests), prometheus.CounterValue)
-	gen(ch, doFunc, "coredns_dnsfilter_safebrowsing_cachehits", "Number of safebrowsing lookups that didn't need HTTP requests", float64(stats.Safebrowsing.CacheHits), prometheus.CounterValue)
-	gen(ch, doFunc, "coredns_dnsfilter_safebrowsing_pending", "Number of currently pending safebrowsing HTTP requests", float64(stats.Safebrowsing.Pending), prometheus.GaugeValue)
-	gen(ch, doFunc, "coredns_dnsfilter_safebrowsing_pending_max", "Maximum number of pending safebrowsing HTTP requests", float64(stats.Safebrowsing.PendingMax), prometheus.GaugeValue)
-	gen(ch, doFunc, "coredns_dnsfilter_parental_requests", "Number of parental HTTP requests that were sent", float64(stats.Parental.Requests), prometheus.CounterValue)
-	gen(ch, doFunc, "coredns_dnsfilter_parental_cachehits", "Number of parental lookups that didn't need HTTP requests", float64(stats.Parental.CacheHits), prometheus.CounterValue)
-	gen(ch, doFunc, "coredns_dnsfilter_parental_pending", "Number of currently pending parental HTTP requests", float64(stats.Parental.Pending), prometheus.GaugeValue)
-	gen(ch, doFunc, "coredns_dnsfilter_parental_pending_max", "Maximum number of pending parental HTTP requests", float64(stats.Parental.PendingMax), prometheus.GaugeValue)
+	doStatsLookup(ch, doFunc, "safebrowsing", &stats.Safebrowsing)
+	doStatsLookup(ch, doFunc, "parental", &stats.Parental)
 }
 
 func (d *Plugin) Describe(ch chan<- *prometheus.Desc) {

dnsfilter/dnsfilter.go

@@ -521,11 +521,11 @@ func (d *Dnsfilter) checkSafeBrowsing(host string) (Result, error) {
 }
 
 func (d *Dnsfilter) checkParental(host string) (Result, error) {
-	format2 := func(hashparam string) string {
+	format := func(hashparam string) string {
 		url := fmt.Sprintf(defaultParentalURL, hashparam, d.config.parentalSensitivity)
 		return url
 	}
-	handleBody2 := func(body []byte, hashes map[string]bool) (Result, error) {
+	handleBody := func(body []byte, hashes map[string]bool) (Result, error) {
 		// parse json
 		var m []struct {
 			Blocked   bool   `json:"blocked"`
@@ -551,7 +551,7 @@ func (d *Dnsfilter) checkParental(host string) (Result, error) {
 		}
 		return result, nil
 	}
-	result, err := d.lookupCommon(host, &stats.Parental, parentalCache, false, format2, handleBody2)
+	result, err := d.lookupCommon(host, &stats.Parental, parentalCache, false, format, handleBody)
 	return result, err
 }
 
@@ -563,7 +563,7 @@ func (d *Dnsfilter) lookupCommon(host string, lookupstats *LookupStats, cache gc
 	// check cache
 	cachedValue, isFound, err := getCachedReason(cache, host)
 	if isFound {
-		atomic.AddUint64(&stats.Safebrowsing.CacheHits, 1)
+		atomic.AddUint64(&lookupstats.CacheHits, 1)
 		return cachedValue, nil
 	}
 	if err != nil {