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Fix linter findings for: funlen, nestif, gocognit, revive, cyclop

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chubin/logging
Igor Chubin 1 year ago
parent 635ac451c0
commit 04f064460c
4 changed files with 125 additions and 104 deletions
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5
.golangci.yaml
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@ -17,12 +17,7 @@ linters:
- ireturn
- gosec
- noctx
- funlen
- nestif
- gocognit
- interfacer
- revive
- cyclop
# deprecated:
- scopelint

2
internal/processor/peak.go
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@ -35,6 +35,8 @@ func (rp *RequestProcessor) startPeakHandling() error {
return nil
}
// registerPeakRequest registers requests coming in the peak time.
// Such requests can be prefetched afterwards just before the peak time comes.
func (rp *RequestProcessor) savePeakRequest(cacheDigest string, r *http.Request) {
if _, min, _ := time.Now().Clock(); min == 30 {
rp.peakRequest30.Store(cacheDigest, *r)

105
internal/processor/processor.go
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@ -39,7 +39,7 @@ func plainTextAgents() []string {
}
}
type responseWithHeader struct {
type ResponseWithHeader struct {
InProgress bool // true if the request is being processed
Expires time.Time // expiration time of the cache entry
@ -105,14 +105,12 @@ func (rp *RequestProcessor) Start() error {
return rp.startPeakHandling()
}
func (rp *RequestProcessor) ProcessRequest(r *http.Request) (*responseWithHeader, error) {
func (rp *RequestProcessor) ProcessRequest(r *http.Request) (*ResponseWithHeader, error) {
var (
response *responseWithHeader
cacheEntry responseWithHeader
err error
response *ResponseWithHeader
ip = util.ReadUserIP(r)
)
ip := util.ReadUserIP(r)
if ip != "127.0.0.1" {
rp.stats.Inc("total")
}
@ -137,46 +135,68 @@ func (rp *RequestProcessor) ProcessRequest(r *http.Request) (*responseWithHeader
return get(r, rp.upstreamTransport)
}
// processing cached request
cacheDigest := getCacheDigest(r)
foundInCache := false
rp.savePeakRequest(cacheDigest, r)
cacheBody, ok := rp.lruCache.Get(cacheDigest)
if ok {
cacheEntry, ok = cacheBody.(responseWithHeader)
response = rp.processRequestFromCache(r)
if response != nil {
return response, nil
}
if ok {
rp.stats.Inc("cache1")
// if after all attempts we still have no answer,
// we try to make the query on our own
for attempts := 0; attempts < 300; attempts++ {
if !ok || !cacheEntry.InProgress {
break
}
time.Sleep(30 * time.Millisecond)
cacheBody, ok = rp.lruCache.Get(cacheDigest)
if ok && cacheBody != nil {
if v, ok := cacheBody.(responseWithHeader); ok {
cacheEntry = v
}
}
}
if cacheEntry.InProgress {
log.Printf("TIMEOUT: %s\n", cacheDigest)
return rp.processUncachedRequest(r)
}
// processRequestFromCache processes requests using the cache.
// If no entry in cache found, nil is returned.
func (rp *RequestProcessor) processRequestFromCache(r *http.Request) *ResponseWithHeader {
var (
cacheEntry ResponseWithHeader
cacheDigest = getCacheDigest(r)
ok bool
)
cacheBody, _ := rp.lruCache.Get(cacheDigest)
cacheEntry, ok = cacheBody.(ResponseWithHeader)
if !ok {
return nil
}
// if after all attempts we still have no answer,
// we try to make the query on our own
for attempts := 0; attempts < 300; attempts++ {
if !ok || !cacheEntry.InProgress {
break
}
if ok && !cacheEntry.InProgress && cacheEntry.Expires.After(time.Now()) {
response = &cacheEntry
foundInCache = true
time.Sleep(30 * time.Millisecond)
cacheBody, _ = rp.lruCache.Get(cacheDigest)
v, ok := cacheBody.(ResponseWithHeader)
if ok {
cacheEntry = v
}
}
if cacheEntry.InProgress {
log.Printf("TIMEOUT: %s\n", cacheDigest)
}
if ok && !cacheEntry.InProgress && cacheEntry.Expires.After(time.Now()) {
rp.stats.Inc("cache1")
if foundInCache {
return response, nil
return &cacheEntry
}
return nil
}
// processUncachedRequest processes requests that were not found in the cache.
func (rp *RequestProcessor) processUncachedRequest(r *http.Request) (*ResponseWithHeader, error) {
var (
cacheDigest = getCacheDigest(r)
ip = util.ReadUserIP(r)
response *ResponseWithHeader
err error
)
// Response was not found in cache.
// Starting real handling.
format := r.URL.Query().Get("format")
@ -187,13 +207,14 @@ func (rp *RequestProcessor) ProcessRequest(r *http.Request) (*responseWithHeader
}
}
// How many IP addresses are known.
// Count, how many IP addresses are known.
_, err = rp.geoIPCache.Read(ip)
if err == nil {
rp.stats.Inc("geoip")
}
rp.lruCache.Add(cacheDigest, responseWithHeader{InProgress: true})
// Indicate, that the request is being handled.
rp.lruCache.Add(cacheDigest, ResponseWithHeader{InProgress: true})
response, err = get(r, rp.upstreamTransport)
if err != nil {
@ -209,7 +230,7 @@ func (rp *RequestProcessor) ProcessRequest(r *http.Request) (*responseWithHeader
return response, nil
}
func get(req *http.Request, transport *http.Transport) (*responseWithHeader, error) {
func get(req *http.Request, transport *http.Transport) (*ResponseWithHeader, error) {
client := &http.Client{
Transport: transport,
}
@ -245,7 +266,7 @@ func get(req *http.Request, transport *http.Transport) (*responseWithHeader, err
return nil, err
}
return &responseWithHeader{
return &ResponseWithHeader{
InProgress: false,
Expires: time.Now().Add(time.Duration(randInt(1000, 1500)) * time.Second),
Body: body,
@ -282,7 +303,7 @@ func dontCache(req *http.Request) bool {
// Insecure queries are marked by the frontend web server
// with X-Forwarded-Proto header:
// `proxy_set_header X-Forwarded-Proto $scheme;`.
func redirectInsecure(req *http.Request) (*responseWithHeader, bool) {
func redirectInsecure(req *http.Request) (*ResponseWithHeader, bool) {
if isPlainTextAgent(req.Header.Get("User-Agent")) {
return nil, false
}
@ -304,7 +325,7 @@ The document has moved
</BODY></HTML>
`, target))
return &responseWithHeader{
return &ResponseWithHeader{
InProgress: false,
Expires: time.Now().Add(time.Duration(randInt(1000, 1500)) * time.Second),
Body: body,
@ -340,8 +361,8 @@ func ipFromAddr(s string) string {
}
// fromCadre converts Cadre into a responseWithHeader.
func fromCadre(cadre *routing.Cadre) *responseWithHeader {
return &responseWithHeader{
func fromCadre(cadre *routing.Cadre) *ResponseWithHeader {
return &ResponseWithHeader{
Body: cadre.Body,
Expires: cadre.Expires,
StatusCode: 200,

117
srv.go
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@ -79,7 +79,9 @@ func serve(conf *config.Config) error {
mux = http.NewServeMux()
// logger is optimized requests logger.
logger *logging.RequestLogger
logger = logging.NewRequestLogger(
conf.Logging.AccessLog,
time.Duration(conf.Logging.Interval)*time.Second)
rp *processor.RequestProcessor
@ -89,25 +91,18 @@ func serve(conf *config.Config) error {
// numberOfServers started. If 0, exit.
numberOfServers int
errorsLog *logging.LogSuppressor
errorsLog = logging.NewLogSuppressor(
conf.Logging.ErrorsLog,
[]string{
"error reading preface from client",
"TLS handshake error from",
},
logLineStart,
)
err error
)
// logger is optimized requests logger.
logger = logging.NewRequestLogger(
conf.Logging.AccessLog,
time.Duration(conf.Logging.Interval)*time.Second)
errorsLog = logging.NewLogSuppressor(
conf.Logging.ErrorsLog,
[]string{
"error reading preface from client",
"TLS handshake error from",
},
logLineStart,
)
rp, err = processor.NewRequestProcessor(conf)
if err != nil {
return fmt.Errorf("log processor initialization: %w", err)
@ -123,11 +118,32 @@ func serve(conf *config.Config) error {
return err
}
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
mux.HandleFunc("/", mainHandler(rp, logger))
if conf.Server.PortHTTP != 0 {
go serveHTTP(mux, conf.Server.PortHTTP, errorsLog, errs)
numberOfServers++
}
if conf.Server.PortHTTPS != 0 {
go serveHTTPS(mux, conf.Server.PortHTTPS, conf.Server.TLSCertFile, conf.Server.TLSKeyFile, errorsLog, errs)
numberOfServers++
}
if numberOfServers == 0 {
return types.ErrNoServersConfigured
}
return <-errs // block until one of the servers writes an error
}
func mainHandler(
rp *processor.RequestProcessor,
logger *logging.RequestLogger,
) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
if err := logger.Log(r); err != nil {
log.Println(err)
}
// printStat()
response, err := rp.ProcessRequest(r)
if err != nil {
log.Println(err)
@ -147,21 +163,7 @@ func serve(conf *config.Config) error {
if err != nil {
log.Println(err)
}
})
if conf.Server.PortHTTP != 0 {
go serveHTTP(mux, conf.Server.PortHTTP, errorsLog, errs)
numberOfServers++
}
if conf.Server.PortHTTPS != 0 {
go serveHTTPS(mux, conf.Server.PortHTTPS, conf.Server.TLSCertFile, conf.Server.TLSKeyFile, errorsLog, errs)
numberOfServers++
}
if numberOfServers == 0 {
return types.ErrNoServersConfigured
}
return <-errs // block until one of the servers writes an error
}
func main() {
@ -192,29 +194,12 @@ func main() {
return
}
if cli.ConvertGeoIPCache {
geoIPCache, err := geoip.NewCache(conf)
if err != nil {
ctx.FatalIfErrorf(err)
}
ctx.FatalIfErrorf(geoIPCache.ConvertCache())
return
}
if cli.ConvertGeoLocationCache {
geoLocCache, err := geoloc.NewCache(conf)
if err != nil {
ctx.FatalIfErrorf(err)
}
ctx.FatalIfErrorf(geoLocCache.ConvertCache())
return
}
if cli.GeoResolve != "" {
switch {
case cli.ConvertGeoIPCache:
ctx.FatalIfErrorf(convertGeoIPCache(conf))
case cli.ConvertGeoLocationCache:
ctx.FatalIfErrorf(convertGeoLocationCache(conf))
case cli.GeoResolve != "":
sr := geoloc.NewSearcher(conf)
loc, err := sr.Search(cli.GeoResolve)
ctx.FatalIfErrorf(err)
@ -222,8 +207,26 @@ func main() {
//nolint:forbidigo
fmt.Println(*loc)
}
default:
err = serve(conf)
ctx.FatalIfErrorf(err)
}
}
func convertGeoIPCache(conf *config.Config) error {
geoIPCache, err := geoip.NewCache(conf)
if err != nil {
return err
}
return geoIPCache.ConvertCache()
}
func convertGeoLocationCache(conf *config.Config) error {
geoLocCache, err := geoloc.NewCache(conf)
if err != nil {
return err
}
err = serve(conf)
ctx.FatalIfErrorf(err)
return geoLocCache.ConvertCache()
}

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