Fix linter findings for: forbidigo, funlen, forcetypeassert, stylecheck

.golangci.yaml

@@ -14,21 +14,16 @@ linters:
     - gofmt
 
     # to be fixed:
+    - ireturn
     - gosec
     - noctx
     - funlen
     - nestif
-    - forbidigo
-    - funlen
     - interfacer
     - revive
     - cyclop
     - goerr113
-    - forcetypeassert
     - gocognit
-    - golint
-    - stylecheck
-    - ireturn
 
     # deprecated:
     - scopelint
@@ -38,3 +33,4 @@ linters:
     - ifshort
     - nosnakecase
     - structcheck
+    - golint

internal/processor/peak.go

@@ -75,12 +75,19 @@ func (rp *RequestProcessor) prefetchPeakRequests(peakRequestMap *sync.Map) {
 	log.Printf("PREFETCH: Prefetching %d requests\n", peakRequestLen)
 	sleepBetweenRequests := time.Duration(rp.config.Uplink.PrefetchInterval*1000/peakRequestLen) * time.Millisecond
 	peakRequestMap.Range(func(key interface{}, value interface{}) bool {
+		req, ok := value.(http.Request)
+		if !ok {
+			log.Println("missing value for:", key)
+
+			return true
+		}
+
 		go func(r http.Request) {
 			err := rp.prefetchRequest(&r)
 			if err != nil {
 				log.Println("prefetch request:", err)
 			}
-		}(value.(http.Request))
+		}(req)
 		peakRequestMap.Delete(key)
 		time.Sleep(sleepBetweenRequests)
 

internal/processor/processor.go

@@ -107,8 +107,9 @@ func (rp *RequestProcessor) Start() error {
 
 func (rp *RequestProcessor) ProcessRequest(r *http.Request) (*responseWithHeader, error) {
 	var (
-		response *responseWithHeader
-		err      error
+		response   *responseWithHeader
+		cacheEntry responseWithHeader
+		err        error
 	)
 
 	ip := util.ReadUserIP(r)
@@ -143,9 +144,11 @@ func (rp *RequestProcessor) ProcessRequest(r *http.Request) (*responseWithHeader
 	rp.savePeakRequest(cacheDigest, r)
 
 	cacheBody, ok := rp.lruCache.Get(cacheDigest)
+	if ok {
+		cacheEntry, ok = cacheBody.(responseWithHeader)
+	}
 	if ok {
 		rp.stats.Inc("cache1")
-		cacheEntry := cacheBody.(responseWithHeader)
 
 		// if after all attempts we still have no answer,
 		// we try to make the query on our own
@@ -156,7 +159,9 @@ func (rp *RequestProcessor) ProcessRequest(r *http.Request) (*responseWithHeader
 			time.Sleep(30 * time.Millisecond)
 			cacheBody, ok = rp.lruCache.Get(cacheDigest)
 			if ok && cacheBody != nil {
-				cacheEntry = cacheBody.(responseWithHeader)
+				if v, ok := cacheBody.(responseWithHeader); ok {
+					cacheEntry = v
+				}
 			}
 		}
 		if cacheEntry.InProgress {
@@ -168,34 +173,37 @@ func (rp *RequestProcessor) ProcessRequest(r *http.Request) (*responseWithHeader
 		}
 	}
 
-	if !foundInCache {
-		// Handling query.
-		format := r.URL.Query().Get("format")
-		if len(format) != 0 {
-			rp.stats.Inc("format")
-			if format == "j1" {
-				rp.stats.Inc("format=j1")
-			}
-		}
+	if foundInCache {
+		return response, nil
+	}
 
-		// How many IP addresses are known.
-		_, err = rp.geoIPCache.Read(ip)
-		if err == nil {
-			rp.stats.Inc("geoip")
+	// Response was not found in cache.
+	// Starting real handling.
+	format := r.URL.Query().Get("format")
+	if len(format) != 0 {
+		rp.stats.Inc("format")
+		if format == "j1" {
+			rp.stats.Inc("format=j1")
 		}
+	}
 
-		rp.lruCache.Add(cacheDigest, responseWithHeader{InProgress: true})
+	// How many IP addresses are known.
+	_, err = rp.geoIPCache.Read(ip)
+	if err == nil {
+		rp.stats.Inc("geoip")
+	}
 
-		response, err = get(r, rp.upstreamTransport)
-		if err != nil {
-			return nil, err
-		}
-		if response.StatusCode == 200 || response.StatusCode == 304 || response.StatusCode == 404 {
-			rp.lruCache.Add(cacheDigest, *response)
-		} else {
-			log.Printf("REMOVE: %d response for %s from cache\n", response.StatusCode, cacheDigest)
-			rp.lruCache.Remove(cacheDigest)
-		}
+	rp.lruCache.Add(cacheDigest, responseWithHeader{InProgress: true})
+
+	response, err = get(r, rp.upstreamTransport)
+	if err != nil {
+		return nil, err
+	}
+	if response.StatusCode == 200 || response.StatusCode == 304 || response.StatusCode == 404 {
+		rp.lruCache.Add(cacheDigest, *response)
+	} else {
+		log.Printf("REMOVE: %d response for %s from cache\n", response.StatusCode, cacheDigest)
+		rp.lruCache.Remove(cacheDigest)
 	}
 
 	return response, nil

srv.go

@@ -76,7 +76,7 @@ func serveHTTPS(mux *http.ServeMux, port int, certFile, keyFile string, logFile
 func serve(conf *config.Config) error {
 	var (
 		// mux is main HTTP/HTTP requests multiplexer.
-		mux *http.ServeMux = http.NewServeMux()
+		mux = http.NewServeMux()
 
 		// logger is optimized requests logger.
 		logger *logging.RequestLogger
@@ -182,10 +182,13 @@ func main() {
 	}
 
 	if cli.ConfigDump {
+		//nolint:forbidigo
 		fmt.Print(string(conf.Dump()))
+
+		return
 	}
 
-	if cli.ConfigCheck || cli.ConfigDump {
+	if cli.ConfigCheck {
 		return
 	}
 
@@ -216,6 +219,7 @@ func main() {
 		loc, err := sr.Search(cli.GeoResolve)
 		ctx.FatalIfErrorf(err)
 		if loc != nil {
+			//nolint:forbidigo
 			fmt.Println(*loc)
 		}
 	}