हमने GO टूल का उपयोग करके अपने DNS सर्वर को कैसे अनुकूलित किया

# timeout 20s ./dnsflood example.com 127.0.0.1 -p 2053

• लटके हुए गोरोचन
• डेफर और फाइनल का दुरुपयोग
• सबस्ट्रिंग और सब-कट्स
• सार्वत्रिक चर

Godebug

ट्रेस प्लानर

$ GODEBUG=schedtrace=100 ./redins -c config.json
SCHED 2952ms: ... runqueue=3 [26 11 7 18 13 30 6 3 24 25 11 0]
SCHED 3053ms: ... runqueue=3 [0 0 0 0 0 0 0 0 4 0 21 0]
SCHED 3154ms: ... runqueue=0 [0 6 2 4 0 30 0 5 0 11 2 5]
SCHED 3255ms: ... runqueue=1 [0 0 0 0 0 0 0 0 0 0 0 0]
SCHED 3355ms: ... runqueue=0 [1 0 0 0 0 0 0 0 0 0 0 0]
SCHED 3456ms: ... runqueue=0 [0 0 0 0 0 0 0 0 0 0 0 0]
SCHED 3557ms: ... runqueue=0 [13 0 3 0 3 33 2 0 10 8 10 14]
SCHED 3657ms: ...runqueue=3 [14 1 0 5 19 54 9 1 0 1 29 0]
SCHED 3758ms: ... runqueue=0 [67 1 5 0 0 1 0 0 87 4 0 0]
SCHED 3859ms: ... runqueue=6 [0 0 3 6 0 0 0 0 3 2 2 19]
SCHED 3960ms: ... runqueue=0 [0 0 1 0 1 0 0 1 0 1 0 0]
SCHED 4060ms: ... runqueue=5 [4 0 5 0 1 0 0 0 0 0 0 0]
SCHED 4161ms: ... runqueue=0 [0 0 0 0 0 0 0 1 0 0 0 0]
SCHED 4262ms: ... runqueue=4 [0 128 21 172 1 19 8 2 43 5 139 37]
SCHED 4362ms: ... runqueue=0 [0 0 0 0 0 0 0 0 0 0 0 0]
SCHED 4463ms: ... runqueue=6 [0 28 23 39 4 11 4 11 25 0 25 0]
SCHED 4564ms: ... runqueue=354 [51 45 33 32 15 20 8 7 5 42 6 0]

SCHED 2449ms: gomaxprocs=12 idleprocs=0 threads=40 spinningthreads=1 idlethreads=1 runqueue=20 [20 20 20 20 20 20 20 20 20 20 20]

कचरा इकट्ठा करने वाला ट्रेस

GODEBUG=gctrace=1 ./redins -c config1.json
.
.
.
gc 30 @3.727s 1%: 0.066+21+0.093 ms clock, 0.79+128/59/0+1.1 ms cpu, 67->71->45 MB, 76 MB goal, 12 P
gc 31 @3.784s 2%: 0.030+27+0.053 ms clock, 0.36+177/81/7.8+0.63 ms cpu, 79->84->55 MB, 90 MB goal, 12 P
gc 32 @3.858s 3%: 0.026+34+0.024 ms clock, 0.32+234/104/0+0.29 ms cpu, 96->100->65 MB, 110 MB goal, 12 P
gc 33 @3.954s 3%: 0.026+44+0.13 ms clock, 0.32+191/131/57+1.6 ms cpu, 117->123->79 MB, 131 MB goal, 12 P
gc 34 @4.077s 4%: 0.010+53+0.024 ms clock, 0.12+241/159/69+0.29 ms cpu, 142->147->91 MB, 158 MB goal, 12 P
gc 35 @4.228s 5%: 0.017+61+0.12 ms clock, 0.20+296/179/94+1.5 ms cpu, 166->174->105 MB, 182 MB goal, 12 P
gc 36 @4.391s 6%: 0.017+73+0.086 ms clock, 0.21+492/216/4.0+1.0 ms cpu, 191->198->122 MB, 210 MB goal, 12 P
gc 37 @4.590s 7%: 0.049+85+0.095 ms clock, 0.59+618/253/0+1.1 ms cpu, 222->230->140 MB, 244 MB goal, 12 P
.
.
.

प्रोफाइलर को सक्षम करना

import (
  _ "net/http/pprof"
)

go func() {
  log.Println(http.ListenAndServe("localhost:6060", nil))
}()

• allocs : सभी पिछले मेमोरी आवंटन प्राप्त करें
• ब्लॉक : स्टैक ट्रेस जिसके कारण सिंक्रोनाइज़ेशन प्राइमेटीज अवरुद्ध हो गया
• गोरोइन : सभी मौजूदा गोरोइन्ट्स का स्टैक ट्रेस
• ढेर : जीवित वस्तुओं की स्मृति आवंटन प्राप्त करें।
• म्यूटेक्स : परस्पर विरोधी म्यूटेक्स धारकों का ढेर
• प्रोफाइल : प्रोसेसर प्रोफाइल।
• थ्रेडक्रैट : एक स्टैक ट्रेस, जिसके कारण ओएस में नए थ्रेड्स का निर्माण हुआ
• ट्रेस : वर्तमान कार्यक्रम के निष्पादन का पता लगाने।

नोट: अन्य सभी समापन बिंदुओं के विपरीत ट्रेस समापन बिंदु, एक ट्रेस प्रोफ़ाइल है , न कि निजी तौर पर , आप इसके बजाय गो टूल ट्रेस का उपयोग करके देख सकते हैं go tool pprof।

प्रोसेसर प्रोफाइलर

‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍$ go tool pprof http://localhost:6060/debug/pprof/profile?seconds=10

(pprof) top 10 -cum
Showing nodes accounting for 1.50s, 6.19% of 24.23s total
Dropped 347 nodes (cum <= 0.12s)
Showing top 10 nodes out of 186
flat  flat%   sum%  cum   cum%
0.03s 0.12% 0.12% 16.7s 69.13% (*Server).serveUDPPacket
0.05s 0.21% 0.33% 15.6s 64.51% (*Server).serveDNS
0     0%    0.33% 14.3s 59.10% (*ServeMux).ServeDNS
0     0%    0.33% 14.2s 58.73% HandlerFunc.ServeDNS
0.01s 0.04% 0.37% 14.2s 58.73% main.handleRequest
0.07s 0.29% 0.66% 13.5s 56.00% (*DnsRequestHandler).HandleRequest
0.99s 4.09% 4.75% 7.56s 31.20% runtime.gentraceback
0.02s 0.08% 4.83% 7.02s 28.97% runtime.systemstack
0.31s 1.28% 6.11% 6.62s 27.32% runtime.mallocgc
0.02s 0.08% 6.19% 6.35s 26.21% (*DnsRequestHandler).FindANAME
(pprof)

(pprof) list handleRequest
Total: 24.23s
ROUTINE ======================== main.handleRequest in /home/arash/go/src/arvancloud/redins/redins.go
     10ms     14.23s (flat, cum) 58.73% of Total
        .          .     35: l          *handler.RateLimiter
        .          .     36: configFile string
        .          .     37:)
        .          .     38:
        .          .     39:func handleRequest(w dns.ResponseWriter, r *dns.Msg) {
     10ms      610ms     40: context := handler.NewRequestContext(w, r)
        .       50ms     41: logger.Default.Debugf("handle request: [%d] %s %s", r.Id, context.RawName(), context.Type())
        .          .     42:
        .          .     43: if l.CanHandle(context.IP()) {
        .     13.57s     44:  h.HandleRequest(context)
        .          .     45: } else {
        .          .     46:  context.Response(dns.RcodeRefused)
        .          .     47: }
        .          .     48:}
        .          .     49:
(pprof)

मेमोरी प्रोफाइलर

$ go tool pprof http://localhost:6060/debug/pprof/allocs

अड़चन की पहचान

$ curl http://localhost:6060/debug/pprof/trace?seconds=5 --output trace.out

$ go tool trace trace.out
2019/12/25 15:30:50 Parsing trace...
2019/12/25 15:30:59 Splitting trace...
2019/12/25 15:31:10 Opening browser. Trace viewer is listening on http://127.0.0.1:42703

Goroutines:
github.com/miekg/dns.(*Server).serveUDPPacket N=441703
runtime.gcBgMarkWorker N=12
github.com/karlseguin/ccache.(*Cache).worker N=2
main.Start.func1 N=1
runtime.bgsweep N=1
arvancloud/redins/handler.NewHandler.func2 N=1
runtime/trace.Start.func1 N=1
net/http.(*conn).serve N=1
runtime.timerproc N=3
net/http.(*connReader).backgroundRead N=1
N=40

runtime.SetBlockProfileRate(1)

$ go tool pprof http://localhost:6060/debug/pprof/block
(pprof) top
Showing nodes accounting for 16.03wks, 99.75% of 16.07wks total
Dropped 87 nodes (cum <= 0.08wks)
Showing top 10 nodes out of 27
     flat  flat%   sum%        cum   cum%
 10.78wks 67.08% 67.08%   10.78wks 67.08%  internal/poll.(*fdMutex).rwlock
  5.25wks 32.67% 99.75%    5.25wks 32.67%  sync.(*Mutex).Lock
        0     0% 99.75%    5.25wks 32.67%  arvancloud/redins/handler.(*DnsRequestHandler).Filter
        0     0% 99.75%    5.25wks 32.68%  arvancloud/redins/handler.(*DnsRequestHandler).FindANAME
        0     0% 99.75%   16.04wks 99.81%  arvancloud/redins/handler.(*DnsRequestHandler).HandleRequest
        0     0% 99.75%   10.78wks 67.08%  arvancloud/redins/handler.(*DnsRequestHandler).Response
        0     0% 99.75%   10.78wks 67.08%  arvancloud/redins/handler.(*RequestContext).Response
        0     0% 99.75%    5.25wks 32.67%  arvancloud/redins/handler.ChooseIp
        0     0% 99.75%   16.04wks 99.81%  github.com/miekg/dns.(*ServeMux).ServeDNS
        0     0% 99.75%   16.04wks 99.81%  github.com/miekg/dns.(*Server).serveDNS
(pprof)

(pprof) svg lock

$ go tool pprof http://localhost:6060/debug/pprof/goroutine

(pprof) top
Showing nodes accounting for 294412, 100% of 294424 total
Dropped 84 nodes (cum <= 1472)
Showing top 10 nodes out of 32
     flat  flat%   sum%        cum   cum%
   294404   100%   100%     294404   100%  runtime.gopark
        8 0.0027%   100%     294405   100%  github.com/miekg/dns.(*Server).serveUDPPacket
        0     0%   100%      58257 19.79%  arvancloud/redins/handler.(*DnsRequestHandler).Filter
        0     0%   100%      58259 19.79%  arvancloud/redins/handler.(*DnsRequestHandler).FindANAME
        0     0%   100%     293852 99.81%  arvancloud/redins/handler.(*DnsRequestHandler).HandleRequest
        0     0%   100%     235406 79.95%  arvancloud/redins/handler.(*DnsRequestHandler).Response
        0     0%   100%     235406 79.95%  arvancloud/redins/handler.(*RequestContext).Response
        0     0%   100%      58140 19.75%  arvancloud/redins/handler.ChooseIp
        0     0%   100%     293852 99.81%  github.com/miekg/dns.(*ServeMux).ServeDNS
        0     0%   100%     293900 99.82%  github.com/miekg/dns.(*Server).serveDNS
(pprof)

(pprof) svg gopark

UDPConn.WriteMsg ()

रैंड ()

rg := rand.New(rand.NewSource(int64(time.Now().Nanosecond())))

(pprof) list promote
ROUTINE ======================== github.com/karlseguin/ccache.(*Cache).promote in ...
        0   9.66days (flat, cum) 99.70% of Total
        .          .    155: h.Write([]byte(key))
        .          .    156: return c.buckets[h.Sum32()&c.bucketMask]
        .          .    157:}
        .          .    158:
        .          .    159:func (c *Cache) promote(item *Item) {
        .   9.66days    160: c.promotables <- item
        .          .    161:}
        .          .    162:
        .          .    163:func (c *Cache) worker() {
        .          .    164: defer close(c.donec)
        .          .    165:

आवंटन अनुकूलन

• मार्कर सेटिंग (STW)
• अंकन (समानांतर)
• लेबलिंग एंड (STW)

• आवंटन की संख्या आकार की तुलना में अधिक महत्वपूर्ण है (उदाहरण के लिए, 20-बाइट संरचना से 1000 मेमोरी आवंटन 20,000 बाइट्स के एकल आवंटन की तुलना में ढेर पर अधिक भार पैदा करते हैं);
• सी / सी ++ जैसी भाषाओं के विपरीत, सभी मेमोरी आवंटन ढेर पर समाप्त नहीं होते हैं। गो कंपाइलर यह तय करता है कि वेरिएबल हीप में जाएगा या स्टैक फ्रेम के अंदर रखा जा सकता है या नहीं। ढेर पर आवंटित चर के विपरीत, ढेर पर आवंटित चर जीसी लोड नहीं करते हैं।

• गर्म वितरण खोजने के लिए प्रोसेसर प्रोफाइलर;
• ट्रैकिंग आवंटन के लिए मेमोरी प्रोफाइलर;
• पैटर्न के लिए अनुरेखक; जीसी
• आवंटन का पता लगाने के लिए विश्लेषण से बचना चाहिए।

$ go tool pprof http://localhost:6060/debug/pprof/profile?seconds=20
(pprof) top 20 -cum
Showing nodes accounting for 7.27s, 29.10% of 24.98s total
Dropped 315 nodes (cum <= 0.12s)
Showing top 20 nodes out of 201
     flat  flat%   sum%        cum   cum%
        0     0%     0%     16.42s 65.73%  github.com/miekg/dns.(*Server).serveUDPPacket
    0.02s  0.08%  0.08%     16.02s 64.13%  github.com/miekg/dns.(*Server).serveDNS
    0.02s  0.08%  0.16%     13.69s 54.80%  github.com/miekg/dns.(*ServeMux).ServeDNS
    0.01s  0.04%   0.2%     13.48s 53.96%  github.com/miekg/dns.HandlerFunc.ServeDNS
    0.02s  0.08%  0.28%     13.47s 53.92%  main.handleRequest
    0.24s  0.96%  1.24%     12.50s 50.04%  arvancloud/redins/handler.(*DnsRequestHandler).HandleRequest
    0.81s  3.24%  4.48%      6.91s 27.66%  runtime.gentraceback
    3.82s 15.29% 19.78%      5.48s 21.94%  syscall.Syscall
    0.02s  0.08% 19.86%      5.44s 21.78%  arvancloud/redins/handler.(*DnsRequestHandler).Response
    0.06s  0.24% 20.10%      5.25s 21.02%  arvancloud/redins/handler.(*RequestContext).Response
    0.03s  0.12% 20.22%      4.97s 19.90%  arvancloud/redins/handler.(*DnsRequestHandler).FindANAME
    0.56s  2.24% 22.46%      4.92s 19.70%  runtime.mallocgc
    0.07s  0.28% 22.74%      4.90s 19.62%  github.com/miekg/dns.(*response).WriteMsg
    0.04s  0.16% 22.90%      4.40s 17.61%  github.com/miekg/dns.(*response).Write
    0.01s  0.04% 22.94%      4.36s 17.45%  github.com/miekg/dns.WriteToSessionUDP
    1.43s  5.72% 28.66%      4.30s 17.21%  runtime.pcvalue
    0.01s  0.04% 28.70%      4.15s 16.61%  runtime.newstack
    0.06s  0.24% 28.94%      4.09s 16.37%  runtime.copystack
    0.01s  0.04% 28.98%      4.05s 16.21%  net.(*UDPConn).WriteMsgUDP
    0.03s  0.12% 29.10%      4.04s 16.17%  net.(*UDPConn).writeMsg

(pprof) svg mallocgc

$ go tool pprof -alloc_objects http://localhost:6060/debug/pprof/allocs
(pprof) top -cum
Active filters:
  show=handler
Showing nodes accounting for 58464353, 59.78% of 97803168 total
Dropped 1 node (cum <= 489015)
Showing top 10 nodes out of 19
     flat  flat%   sum%        cum   cum%
 15401215 15.75% 15.75%   70279955 71.86%  arvancloud/redins/handler.(*DnsRequestHandler).HandleRequest
  2392100  2.45% 18.19%   27198697 27.81%  arvancloud/redins/handler.(*DnsRequestHandler).FindANAME
   711174  0.73% 18.92%   14936976 15.27%  arvancloud/redins/handler.(*DnsRequestHandler).Filter
        0     0% 18.92%   14161410 14.48%  arvancloud/redins/handler.(*DnsRequestHandler).Response
 14161410 14.48% 33.40%   14161410 14.48%  arvancloud/redins/handler.(*RequestContext).Response
  7284487  7.45% 40.85%   11118401 11.37%  arvancloud/redins/handler.NewRequestContext
 10439697 10.67% 51.52%   10439697 10.67%  arvancloud/redins/handler.reverseZone
        0     0% 51.52%   10371430 10.60%  arvancloud/redins/handler.(*DnsRequestHandler).FindZone
  2680723  2.74% 54.26%    8022046  8.20%  arvancloud/redins/handler.(*GeoIp).GetSameCountry
  5393547  5.51% 59.78%    5393547  5.51%  arvancloud/redins/handler.(*DnsRequestHandler).LoadLocation

(pprof) list handleRequest
Total: 97803168
ROUTINE ======================== main.handleRequest in /home/arash/go/src/arvancloud/redins/redins.go
  2555943   83954299 (flat, cum) 85.84% of Total
        .          .     35: l          *handler.RateLimiter
        .          .     36: configFile string
        .          .     37:)
        .          .     38:
        .          .     39:func handleRequest(w dns.ResponseWriter, r *dns.Msg) {
        .   11118401     40: context := handler.NewRequestContext(w, r)
  2555943    2555943     41: logger.Default.Debugf("handle request: [%d] %s %s", r.Id, context.RawName(), context.Type())
        .          .     42:
        .          .     43: if l.CanHandle(context.IP()) {
        .   70279955     44:  h.HandleRequest(context)
        .          .     45: } else {
        .          .     46:  context.Response(dns.RcodeRefused)
        .          .     47: }
        .          .     48:}
        .          .     49:

$ go build -gcflags '-m'

$ go build -gcflags '-m '

$ go build -gcflags '-m'
.
.
.
../redins.go:39:20: leaking param: w
./redins.go:39:42: leaking param: r
./redins.go:41:55: r.MsgHdr.Id escapes to heap
./redins.go:41:75: context.RawName() escapes to heap
./redins.go:41:91: context.Request.Type() escapes to heap
./redins.go:41:23: handleRequest []interface {} literal does not escape
./redins.go:219:17: leaking param: path
.
.
.

func (l *EventLogger) Debugf(format string, args ...interface{})

(pprof) list reverseZone
Total: 100817064
ROUTINE ======================== arvancloud/redins/handler.reverseZone in /home/arash/go/src/arvancloud/redins/handler/handler.go
  6127746   10379086 (flat, cum) 10.29% of Total
        .          .    396:  logger.Default.Warning("log queue is full")
        .          .    397: }
        .          .    398:}
        .          .    399:
        .          .    400:func reverseZone(zone string) string {
        .    4251340    401: x := strings.Split(zone, ".")
        .          .    402: var y string
        .          .    403: for i := len(x) - 1; i >= 0; i-- {
  6127746    6127746    404:  y += x[i] + "."
        .          .    405: }
        .          .    406: return y
        .          .    407:}
        .          .    408:
        .          .    409:func (h *DnsRequestHandler) LoadZones() {
(pprof)

(pprof) list reverseZone
Total: 93437002
ROUTINE ======================== arvancloud/redins/handler.reverseZone in /home/arash/go/src/arvancloud/redins/handler/handler.go
        0    7580611 (flat, cum)  8.11% of Total
        .          .    396:  logger.Default.Warning("log queue is full")
        .          .    397: }
        .          .    398:}
        .          .    399:
        .          .    400:func reverseZone(zone string) string {
        .    3681140    401: x := strings.Split(zone, ".")
        .          .    402: var sb strings.Builder
        .    3899471    403: sb.Grow(len(zone)+1)
        .          .    404: for i := len(x) - 1; i >= 0; i-- {
        .          .    405:  sb.WriteString(x[i])
        .          .    406:  sb.WriteByte('.')
        .          .    407: }
        .          .    408: return sb.String()

(pprof) list reverseZone
Total: 89094296
ROUTINE ======================== arvancloud/redins/handler.reverseZone in /home/arash/go/src/arvancloud/redins/handler/handler.go
  3801168    3801168 (flat, cum)  4.27% of Total
        .          .    400:func reverseZone(zone string) []byte {
        .          .    401: runes := []rune("." + zone)
        .          .    402: for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
        .          .    403:  runes[i], runes[j] = runes[j], runes[i]
        .          .    404: }
  3801168    3801168    405: return []byte(string(runes))
        .          .    406:}
        .          .    407:
        .          .    408:func (h *DnsRequestHandler) LoadZones() {
        .          .    409: h.LastZoneUpdate = time.Now()
        .          .    410: zones, err := h.Redis.SMembers("redins:zones")

sync.Pool

(pprof) list GetASN
Total: 69005282
ROUTINE ======================== arvancloud/redins/handler.(*GeoIp).GetASN in /home/arash/go/src/arvancloud/redins/handler/geoip.go
  1146897    1146897 (flat, cum)  1.66% of Total
        .          .    231:func (g *GeoIp) GetASN(ip net.IP) (uint, error) {
  1146897    1146897    232: var record struct {
        .          .    233:  AutonomousSystemNumber uint `maxminddb:"autonomous_system_number"`
        .          .    234: }
        .          .    235: err := g.ASNDB.Lookup(ip, &record)
        .          .    236: if err != nil {
        .          .    237:  logger.Default.Errorf("lookup failed : %s", err)
(pprof) list GetGeoLocation
Total: 69005282
ROUTINE ======================== arvancloud/redins/handler.(*GeoIp).GetGeoLocation in /home/arash/go/src/arvancloud/redins/handler/geoip.go
  1376298    3604572 (flat, cum)  5.22% of Total
        .          .    207:
        .          .    208:func (g *GeoIp) GetGeoLocation(ip net.IP) (latitude float64, longitude float64, country string, err error) {
        .          .    209: if !g.Enable || g.CountryDB == nil {
        .          .    210:  return
        .          .    211: }
  1376298    1376298    212: var record struct {
        .          .    213:  Location struct {
        .          .    214:   Latitude        float64 `maxminddb:"latitude"`
        .          .    215:   LongitudeOffset uintptr `maxminddb:"longitude"`
        .          .    216:  } `maxminddb:"location"`
        .          .    217:  Country struct {
        .          .    218:   ISOCode string `maxminddb:"iso_code"`
        .          .    219:  } `maxminddb:"country"`
        .          .    220: }
        .          .    221: // logger.Default.Debugf("ip : %s", ip)
        .          .    222: if err := g.CountryDB.Lookup(ip, &record); err != nil {
        .          .    223:  logger.Default.Errorf("lookup failed : %s", err)
        .          .    224:  return 0, 0, "", err
        .          .    225: }
        .    2228274    226: _ = g.CountryDB.Decode(record.Location.LongitudeOffset, &longitude)
        .          .    227: // logger.Default.Debug("lat = ", record.Location.Latitude, " lang = ", longitude, " country = ", record.Country.ISOCode)
        .          .    228: return record.Location.Latitude, longitude, record.Country.ISOCode, nil
        .          .    229:}
        .          .    230:
        .          .    231:func (g *GeoIp) GetASN(ip net.IP) (uint, error) {

type MMDBGeoLocation struct {
  Coordinations struct {
     Latitude        float64 `maxminddb:"latitude"`
     Longitude       float64
     LongitudeOffset uintptr `maxminddb:"longitude"`
  } `maxminddb:"location"`
  Country struct {
     ISOCode string `maxminddb:"iso_code"`
  } `maxminddb:"country"`
}

type MMDBASN struct {
  AutonomousSystemNumber uint `maxminddb:"autonomous_system_number"`
}
func (g *GeoIp) GetGeoLocation(ip net.IP) (*MMDBGeoLocation, error) {
  if !g.Enable || g.CountryDB == nil {
     return nil, EMMDBNotAvailable
  }
  var record *MMDBGeoLocation = g.LocationPool.Get().(*MMDBGeoLocation)
  logger.Default.Debugf("ip : %s", ip)
  if err := g.CountryDB.Lookup(ip, &record); err != nil {
     logger.Default.Errorf("lookup failed : %s", err)
     return nil, err
  }
  _ = g.CountryDB.Decode(record.Coordinations.LongitudeOffset, &record.Coordinations.Longitude)
  logger.Default.Debug("lat = ", record.Coordinations.Latitude, " lang = ", record.Coordinations.Longitude, " country = ", record.Country.ISOCode)
  return record, nil
}

func (g *GeoIp) GetASN(ip net.IP) (uint, error) {
  var record *MMDBASN = g.AsnPool.Get().(*MMDBASN)
  err := g.ASNDB.Lookup(ip, record)
  if err != nil {
     logger.Default.Errorf("lookup failed : %s", err)
     return 0, err
  }
  logger.Default.Debug("asn = ", record.AutonomousSystemNumber)
  return record.AutonomousSystemNumber, nil
}

परिणाम

निष्कर्ष

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