Pull request 2195: upd-go-code

Squashed commit of the following:

commit a1bd3c249be043108c84a902d2e88bf80946d444
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Apr 4 14:59:37 2024 +0300

    all: upd more

commit 9e55bbb02c2af2064aa2a2ca7b49fd28b544a02c
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Apr 4 14:12:45 2024 +0300

    all: upd go code

go.mod

@@ -34,7 +34,7 @@ require (
 	go.etcd.io/bbolt v1.3.9
 	golang.org/x/crypto v0.21.0
 	golang.org/x/exp v0.0.0-20240222234643-814bf88cf225
-	golang.org/x/net v0.22.0
+	golang.org/x/net v0.23.0
 	golang.org/x/sys v0.18.0
 	gopkg.in/natefinch/lumberjack.v2 v2.2.1
 	gopkg.in/yaml.v3 v3.0.1

go.sum

@@ -145,8 +145,8 @@ golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLdyRGr576XBO4/greRjx4P4O3yc=
-golang.org/x/net v0.22.0 h1:9sGLhx7iRIHEiX0oAJ3MRZMUCElJgy7Br1nO+AMN3Tc=
-golang.org/x/net v0.22.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=
+golang.org/x/net v0.23.0 h1:7EYJ93RZ9vYSZAIb2x3lnuvqO5zneoD6IvWjuhfxjTs=
+golang.org/x/net v0.23.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=

internal/aghalg/aghalg.go

@@ -10,29 +10,8 @@ import (
 	"golang.org/x/exp/constraints"
 )
 
-// Coalesce returns the first non-zero value.  It is named after function
-// COALESCE in SQL.  If values or all its elements are empty, it returns a zero
-// value.
-//
-// T is comparable, because Go currently doesn't have a comparableWithZeroValue
-// constraint.
-//
-// TODO(a.garipov): Think of ways to merge with [CoalesceSlice].
-func Coalesce[T comparable](values ...T) (res T) {
-	var zero T
-	for _, v := range values {
-		if v != zero {
-			return v
-		}
-	}
-
-	return zero
-}
-
 // CoalesceSlice returns the first non-zero value.  It is named after function
 // COALESCE in SQL.  If values or all its elements are empty, it returns nil.
-//
-// TODO(a.garipov): Think of ways to merge with [Coalesce].
 func CoalesceSlice[E any, S []E](values ...S) (res S) {
 	for _, v := range values {
 		if v != nil {

internal/aghalg/ringbuffer_test.go

@@ -33,7 +33,7 @@ func elements(b *aghalg.RingBuffer[int], n uint, reverse bool) (es []int) {
 func TestNewRingBuffer(t *testing.T) {
 	t.Run("success_and_clear", func(t *testing.T) {
 		b := aghalg.NewRingBuffer[int](5)
-		for i := 0; i < 10; i++ {
+		for i := range 10 {
 			b.Append(i)
 		}
 		assert.Equal(t, []int{5, 6, 7, 8, 9}, elements(b, b.Len(), false))
@@ -44,7 +44,7 @@ func TestNewRingBuffer(t *testing.T) {
 
 	t.Run("zero", func(t *testing.T) {
 		b := aghalg.NewRingBuffer[int](0)
-		for i := 0; i < 10; i++ {
+		for i := range 10 {
 			b.Append(i)
 			bufLen := b.Len()
 			assert.EqualValues(t, 0, bufLen)
@@ -55,7 +55,7 @@ func TestNewRingBuffer(t *testing.T) {
 
 	t.Run("single", func(t *testing.T) {
 		b := aghalg.NewRingBuffer[int](1)
-		for i := 0; i < 10; i++ {
+		for i := range 10 {
 			b.Append(i)
 			bufLen := b.Len()
 			assert.EqualValues(t, 1, bufLen)
@@ -94,7 +94,7 @@ func TestRingBuffer_Range(t *testing.T) {
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
-			for i := 0; i < tc.count; i++ {
+			for i := range tc.count {
 				b.Append(i)
 			}
 

internal/aghalg/sortedmap_test.go

@@ -11,7 +11,7 @@ func TestNewSortedMap(t *testing.T) {
 	var m SortedMap[string, int]
 
 	letters := []string{}
-	for i := 0; i < 10; i++ {
+	for i := range 10 {
 		r := string('a' + rune(i))
 		letters = append(letters, r)
 	}

internal/aghos/filewalker.go

@@ -97,6 +97,8 @@ func (fw FileWalker) Walk(fsys fs.FS, initial ...string) (ok bool, err error) {
 	var filename string
 	defer func() { err = errors.Annotate(err, "checking %q: %w", filename) }()
 
+	// TODO(e.burkov):  Redo this loop, as it modifies the very same slice it
+	// iterates over.
 	for i := 0; i < len(src); i++ {
 		var patterns []string
 		var cont bool

internal/aghrenameio/renameio_test.go

@@ -78,7 +78,6 @@ func TestWithDeferredCleanup(t *testing.T) {
 	}}
 
 	for _, tc := range testCases {
-		tc := tc
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 

internal/client/addrproc_test.go

@@ -91,8 +91,6 @@ func TestDefaultAddrProc_Process_rDNS(t *testing.T) {
 	}}
 
 	for _, tc := range testCases {
-		tc := tc
-
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 
@@ -186,8 +184,6 @@ func TestDefaultAddrProc_Process_WHOIS(t *testing.T) {
 	}}
 
 	for _, tc := range testCases {
-		tc := tc
-
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 

internal/configmigrate/v15.go

@@ -1,5 +1,7 @@
 package configmigrate
 
+import "github.com/AdguardTeam/golibs/errors"
+
 // migrateTo15 performs the following changes:
 //
 //	# BEFORE:
@@ -43,7 +45,7 @@ func migrateTo15(diskConf yobj) (err error) {
 	}
 	diskConf["querylog"] = qlog
 
-	return coalesceError(
+	return errors.Join(
 		moveVal[bool](dns, qlog, "querylog_enabled", "enabled"),
 		moveVal[bool](dns, qlog, "querylog_file_enabled", "file_enabled"),
 		moveVal[any](dns, qlog, "querylog_interval", "interval"),

internal/configmigrate/v24.go

@@ -1,5 +1,7 @@
 package configmigrate
 
+import "github.com/AdguardTeam/golibs/errors"
+
 // migrateTo24 performs the following changes:
 //
 //	# BEFORE:
@@ -28,7 +30,7 @@ func migrateTo24(diskConf yobj) (err error) {
 	diskConf["schema_version"] = 24
 
 	logObj := yobj{}
-	err = coalesceError(
+	err = errors.Join(
 		moveVal[string](diskConf, logObj, "log_file", "file"),
 		moveVal[int](diskConf, logObj, "log_max_backups", "max_backups"),
 		moveVal[int](diskConf, logObj, "log_max_size", "max_size"),

internal/configmigrate/v26.go

@@ -1,5 +1,7 @@
 package configmigrate
 
+import "github.com/AdguardTeam/golibs/errors"
+
 // migrateTo26 performs the following changes:
 //
 //	# BEFORE:
@@ -78,7 +80,7 @@ func migrateTo26(diskConf yobj) (err error) {
 	}
 
 	filteringObj := yobj{}
-	err = coalesceError(
+	err = errors.Join(
 		moveSameVal[bool](dns, filteringObj, "filtering_enabled"),
 		moveSameVal[int](dns, filteringObj, "filters_update_interval"),
 		moveSameVal[bool](dns, filteringObj, "parental_enabled"),

internal/configmigrate/v7.go

@@ -1,5 +1,7 @@
 package configmigrate
 
+import "github.com/AdguardTeam/golibs/errors"
+
 // migrateTo7 performs the following changes:
 //
 //	# BEFORE:
@@ -37,7 +39,7 @@ func migrateTo7(diskConf yobj) (err error) {
 	}
 
 	dhcpv4 := yobj{}
-	err = coalesceError(
+	err = errors.Join(
 		moveSameVal[string](dhcp, dhcpv4, "gateway_ip"),
 		moveSameVal[string](dhcp, dhcpv4, "subnet_mask"),
 		moveSameVal[string](dhcp, dhcpv4, "range_start"),

internal/configmigrate/yaml.go

@@ -50,19 +50,3 @@ func moveVal[T any](src, dst yobj, srcKey, dstKey string) (err error) {
 func moveSameVal[T any](src, dst yobj, key string) (err error) {
 	return moveVal[T](src, dst, key, key)
 }
-
-// coalesceError returns the first non-nil error.  It is named after function
-// COALESCE in SQL.  If all errors are nil, it returns nil.
-//
-// TODO(e.burkov): Replace with [errors.Join].
-//
-// TODO(a.garipov): Think of ways to merge with [aghalg.Coalesce].
-func coalesceError(errors ...error) (res error) {
-	for _, err := range errors {
-		if err != nil {
-			return err
-		}
-	}
-
-	return nil
-}

internal/dnsforward/dns64_test.go

@@ -266,7 +266,6 @@ func TestServer_HandleDNSRequest_dns64(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		tc := tc
 		t.Run(tc.name, func(t *testing.T) {
 			upsHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
 				q := req.Question[0]

internal/dnsforward/dnsforward.go

@@ -2,6 +2,7 @@
 package dnsforward
 
 import (
+	"cmp"
 	"context"
 	"fmt"
 	"io"
@@ -15,7 +16,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/AdguardTeam/AdGuardHome/internal/aghalg"
 	"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
 	"github.com/AdguardTeam/AdGuardHome/internal/client"
 	"github.com/AdguardTeam/AdGuardHome/internal/filtering"
@@ -908,5 +908,5 @@ func (s *Server) IsBlockedClient(ip netip.Addr, clientID string) (blocked bool,
 		blocked = true
 	}
 
-	return blocked, aghalg.Coalesce(rule, clientID)
+	return blocked, cmp.Or(rule, clientID)
 }

internal/dnsforward/dnsforward_test.go

@@ -1,6 +1,7 @@
 package dnsforward
 
 import (
+	"cmp"
 	"context"
 	"crypto/ecdsa"
 	"crypto/rand"
@@ -21,7 +22,6 @@ import (
 	"testing/fstest"
 	"time"
 
-	"github.com/AdguardTeam/AdGuardHome/internal/aghalg"
 	"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
 	"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
 	"github.com/AdguardTeam/AdGuardHome/internal/filtering"
@@ -190,7 +190,7 @@ func newGoogleUpstream() (u upstream.Upstream) {
 	return &aghtest.UpstreamMock{
 		OnAddress: func() (addr string) { return "google.upstream.example" },
 		OnExchange: func(req *dns.Msg) (resp *dns.Msg, err error) {
-			return aghalg.Coalesce(
+			return cmp.Or(
 				aghtest.MatchedResponse(req, dns.TypeA, googleDomainName, "8.8.8.8"),
 				new(dns.Msg).SetRcode(req, dns.RcodeNameError),
 			), nil
@@ -253,7 +253,7 @@ func sendTestMessagesAsync(t *testing.T, conn *dns.Conn) {
 
 	wg := &sync.WaitGroup{}
 
-	for i := 0; i < testMessagesCount; i++ {
+	for range testMessagesCount {
 		msg := createGoogleATestMessage()
 		wg.Add(1)
 
@@ -276,7 +276,7 @@ func sendTestMessagesAsync(t *testing.T, conn *dns.Conn) {
 func sendTestMessages(t *testing.T, conn *dns.Conn) {
 	t.Helper()
 
-	for i := 0; i < testMessagesCount; i++ {
+	for i := range testMessagesCount {
 		req := createGoogleATestMessage()
 		err := conn.WriteMsg(req)
 		assert.NoErrorf(t, err, "cannot write message #%d: %s", i, err)
@@ -691,7 +691,7 @@ func TestServerCustomClientUpstream(t *testing.T) {
 	ups := aghtest.NewUpstreamMock(func(req *dns.Msg) (resp *dns.Msg, err error) {
 		atomic.AddUint32(&upsCalledCounter, 1)
 
-		return aghalg.Coalesce(
+		return cmp.Or(
 			aghtest.MatchedResponse(req, dns.TypeA, "host", "192.168.0.1"),
 			new(dns.Msg).SetRcode(req, dns.RcodeNameError),
 		), nil
@@ -1152,7 +1152,7 @@ func TestRewrite(t *testing.T) {
 	}))
 
 	ups := aghtest.NewUpstreamMock(func(req *dns.Msg) (resp *dns.Msg, err error) {
-		return aghalg.Coalesce(
+		return cmp.Or(
 			aghtest.MatchedResponse(req, dns.TypeA, "example.org", "4.3.2.1"),
 			new(dns.Msg).SetRcode(req, dns.RcodeNameError),
 		), nil
@@ -1481,7 +1481,7 @@ func TestServer_Exchange(t *testing.T) {
 	require.NoError(t, err)
 
 	extUpsHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
-		resp := aghalg.Coalesce(
+		resp := cmp.Or(
 			aghtest.MatchedResponse(req, dns.TypePTR, onesRevExtIPv4, dns.Fqdn(onesHost)),
 			doubleTTL(aghtest.MatchedResponse(req, dns.TypePTR, twosRevExtIPv4, dns.Fqdn(twosHost))),
 			new(dns.Msg).SetRcode(req, dns.RcodeNameError),
@@ -1495,7 +1495,7 @@ func TestServer_Exchange(t *testing.T) {
 	require.NoError(t, err)
 
 	locUpsHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
-		resp := aghalg.Coalesce(
+		resp := cmp.Or(
 			aghtest.MatchedResponse(req, dns.TypePTR, revLocIPv4, dns.Fqdn(localDomainHost)),
 			new(dns.Msg).SetRcode(req, dns.RcodeNameError),
 		)

internal/dnsforward/process_internal_test.go

@@ -1,11 +1,11 @@
 package dnsforward
 
 import (
+	"cmp"
 	"net"
 	"net/netip"
 	"testing"
 
-	"github.com/AdguardTeam/AdGuardHome/internal/aghalg"
 	"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
 	"github.com/AdguardTeam/AdGuardHome/internal/filtering"
 	"github.com/AdguardTeam/dnsproxy/proxy"
@@ -70,8 +70,6 @@ func TestServer_ProcessInitial(t *testing.T) {
 	}}
 
 	for _, tc := range testCases {
-		tc := tc
-
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 
@@ -171,8 +169,6 @@ func TestServer_ProcessFilteringAfterResponse(t *testing.T) {
 	}}
 
 	for _, tc := range testCases {
-		tc := tc
-
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 
@@ -667,7 +663,7 @@ func TestServer_ProcessRestrictLocal(t *testing.T) {
 	)
 
 	localUpsHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
-		resp := aghalg.Coalesce(
+		resp := cmp.Or(
 			aghtest.MatchedResponse(req, dns.TypePTR, extPTRQuestion, extPTRAnswer),
 			aghtest.MatchedResponse(req, dns.TypePTR, intPTRQuestion, intPTRAnswer),
 			new(dns.Msg).SetRcode(req, dns.RcodeNameError),
@@ -756,7 +752,7 @@ func TestServer_ProcessLocalPTR_usingResolvers(t *testing.T) {
 	const reqAddr = "1.1.168.192.in-addr.arpa."
 
 	localUpsHdlr := dns.HandlerFunc(func(w dns.ResponseWriter, req *dns.Msg) {
-		resp := aghalg.Coalesce(
+		resp := cmp.Or(
 			aghtest.MatchedResponse(req, dns.TypePTR, reqAddr, locDomain),
 			new(dns.Msg).SetRcode(req, dns.RcodeNameError),
 		)

internal/filtering/filtering_test.go

@@ -200,7 +200,7 @@ func TestParallelSB(t *testing.T) {
 	t.Cleanup(d.Close)
 
 	t.Run("group", func(t *testing.T) {
-		for i := 0; i < 100; i++ {
+		for i := range 100 {
 			t.Run(fmt.Sprintf("aaa%d", i), func(t *testing.T) {
 				t.Parallel()
 				d.checkMatch(t, sbBlocked, setts)
@@ -670,7 +670,7 @@ func BenchmarkSafeBrowsing(b *testing.B) {
 	}, nil)
 	b.Cleanup(d.Close)
 
-	for n := 0; n < b.N; n++ {
+	for range b.N {
 		res, err := d.CheckHost(sbBlocked, dns.TypeA, setts)
 		require.NoError(b, err)
 

internal/filtering/idgenerator_internal_test.go

@@ -63,8 +63,6 @@ func TestIDGenerator_Fix(t *testing.T) {
 	}}
 
 	for _, tc := range testCases {
-		tc := tc
-
 		t.Run(tc.name, func(t *testing.T) {
 			g := newIDGenerator(1)
 			g.fix(tc.in)

internal/filtering/rulelist/parser_test.go

@@ -132,7 +132,6 @@ func TestParser_Parse(t *testing.T) {
 	}}
 
 	for _, tc := range testCases {
-		tc := tc
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 
@@ -216,7 +215,7 @@ func BenchmarkParser_Parse(b *testing.B) {
 
 	b.ReportAllocs()
 	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
+	for range b.N {
 		resSink, errSink = p.Parse(dst, src, buf)
 		dst.Reset()
 	}

internal/filtering/safesearch/safesearch_internal_test.go

@@ -127,7 +127,7 @@ var dnsRewriteSink *rules.DNSRewrite
 func BenchmarkSafeSearch(b *testing.B) {
 	ss := newForTest(b, defaultSafeSearchConf)
 
-	for n := 0; n < b.N; n++ {
+	for range b.N {
 		dnsRewriteSink = ss.searchHost(googleHost, testQType)
 	}
 

internal/home/clientshttp.go

@@ -434,7 +434,7 @@ func (clients *clientsContainer) handleUpdateClient(w http.ResponseWriter, r *ht
 func (clients *clientsContainer) handleFindClient(w http.ResponseWriter, r *http.Request) {
 	q := r.URL.Query()
 	data := []map[string]*clientJSON{}
-	for i := 0; i < len(q); i++ {
+	for i := range len(q) {
 		idStr := q.Get(fmt.Sprintf("ip%d", i))
 		if idStr == "" {
 			break

internal/home/log.go

@@ -1,13 +1,13 @@
 package home
 
 import (
+	"cmp"
 	"fmt"
 	"path/filepath"
 	"runtime"
 
 	"github.com/AdguardTeam/AdGuardHome/internal/aghos"
 	"github.com/AdguardTeam/golibs/log"
-	"github.com/AdguardTeam/golibs/stringutil"
 	"gopkg.in/natefinch/lumberjack.v2"
 	"gopkg.in/yaml.v3"
 )
@@ -76,8 +76,7 @@ func getLogSettings(opts options) (ls *logSettings) {
 		ls.Verbose = true
 	}
 
-	// TODO(a.garipov): Use cmp.Or in Go 1.22.
-	ls.File = stringutil.Coalesce(opts.logFile, ls.File)
+	ls.File = cmp.Or(opts.logFile, ls.File)
 
 	if opts.runningAsService && ls.File == "" && runtime.GOOS == "windows" {
 		// When running as a Windows service, use eventlog by default if

internal/home/service_openbsd.go

@@ -3,6 +3,7 @@
 package home
 
 import (
+	"cmp"
 	"fmt"
 	"os"
 	"os/signal"
@@ -14,7 +15,6 @@ import (
 	"github.com/AdguardTeam/AdGuardHome/internal/aghos"
 	"github.com/AdguardTeam/golibs/errors"
 	"github.com/AdguardTeam/golibs/log"
-	"github.com/AdguardTeam/golibs/stringutil"
 	"github.com/kardianos/service"
 )
 
@@ -76,7 +76,7 @@ func (*openbsdRunComService) Platform() (p string) {
 
 // String implements service.Service interface for *openbsdRunComService.
 func (s *openbsdRunComService) String() string {
-	return stringutil.Coalesce(s.cfg.DisplayName, s.cfg.Name)
+	return cmp.Or(s.cfg.DisplayName, s.cfg.Name)
 }
 
 // getBool returns the value of the given name from kv, assuming the value is a

internal/ipset/ipset_linux_internal_test.go

@@ -147,7 +147,7 @@ func BenchmarkManager_LookupHost(b *testing.B) {
 
 	b.Run("long", func(b *testing.B) {
 		const name = "a.very.long.domain.name.inside.the.domain.example.com"
-		for i := 0; i < b.N; i++ {
+		for range b.N {
 			ipsetPropsSink = m.lookupHost(name)
 		}
 
@@ -156,7 +156,7 @@ func BenchmarkManager_LookupHost(b *testing.B) {
 
 	b.Run("short", func(b *testing.B) {
 		const name = "example.net"
-		for i := 0; i < b.N; i++ {
+		for range b.N {
 			ipsetPropsSink = m.lookupHost(name)
 		}
 

internal/querylog/decode_test.go

@@ -303,7 +303,7 @@ func BenchmarkAnonymizeIP(b *testing.B) {
 		b.Run(bc.name, func(b *testing.B) {
 			b.ReportAllocs()
 
-			for i := 0; i < b.N; i++ {
+			for range b.N {
 				AnonymizeIP(bc.ip)
 			}
 
@@ -313,7 +313,7 @@ func BenchmarkAnonymizeIP(b *testing.B) {
 		b.Run(bc.name+"_slow", func(b *testing.B) {
 			b.ReportAllocs()
 
-			for i := 0; i < b.N; i++ {
+			for range b.N {
 				anonymizeIPSlow(bc.ip)
 			}
 

internal/querylog/qlog_test.go

@@ -143,13 +143,13 @@ func TestQueryLogOffsetLimit(t *testing.T) {
 		secondPageDomain = "second.example.org"
 	)
 	// Add entries to the log.
-	for i := 0; i < entNum; i++ {
+	for range entNum {
 		addEntry(l, secondPageDomain, net.IPv4(1, 1, 1, 1), net.IPv4(2, 2, 2, 1))
 	}
 	// Write them to the first file.
 	require.NoError(t, l.flushLogBuffer())
 	// Add more to the in-memory part of log.
-	for i := 0; i < entNum; i++ {
+	for range entNum {
 		addEntry(l, firstPageDomain, net.IPv4(1, 1, 1, 1), net.IPv4(2, 2, 2, 1))
 	}
 
@@ -215,7 +215,7 @@ func TestQueryLogMaxFileScanEntries(t *testing.T) {
 
 	const entNum = 10
 	// Add entries to the log.
-	for i := 0; i < entNum; i++ {
+	for range entNum {
 		addEntry(l, "example.org", net.IPv4(1, 1, 1, 1), net.IPv4(2, 2, 2, 1))
 	}
 	// Write them to disk.

internal/querylog/qlogfile_test.go

@@ -37,7 +37,7 @@ func prepareTestFile(t *testing.T, dir string, linesNum int) (name string) {
 
 	var lineIP uint32
 	lineTime := time.Date(2020, 2, 18, 19, 36, 35, 920973000, time.UTC)
-	for i := 0; i < linesNum; i++ {
+	for range linesNum {
 		lineIP++
 		lineTime = lineTime.Add(time.Second)
 

internal/stats/stats_internal_test.go

@@ -68,13 +68,13 @@ func TestStats_races(t *testing.T) {
 		startWG, finWG := &sync.WaitGroup{}, &sync.WaitGroup{}
 		waitCh := make(chan unit)
 
-		for i := 0; i < writersNum; i++ {
+		for i := range writersNum {
 			startWG.Add(1)
 			finWG.Add(1)
 			go writeFunc(startWG, finWG, waitCh, i)
 		}
 
-		for i := 0; i < readersNum; i++ {
+		for range readersNum {
 			startWG.Add(1)
 			finWG.Add(1)
 			go readFunc(startWG, finWG, waitCh)
@@ -111,7 +111,7 @@ func TestStatsCtx_FillCollectedStats_daily(t *testing.T) {
 
 	dailyData := []*unitDB{}
 
-	for i := 0; i < daysCount*24; i++ {
+	for i := range daysCount * 24 {
 		n := uint64(i)
 		nResult := make([]uint64, resultLast)
 		nResult[RFiltered] = n

internal/stats/stats_test.go

@@ -195,7 +195,7 @@ func TestLargeNumbers(t *testing.T) {
 	for h := 0; h < hoursNum; h++ {
 		atomic.AddUint32(&curHour, 1)
 
-		for i := 0; i < cliNumPerHour; i++ {
+		for i := range cliNumPerHour {
 			ip := net.IP{127, 0, byte((i & 0xff00) >> 8), byte(i & 0xff)}
 			e := &stats.Entry{
 				Domain:         fmt.Sprintf("domain%d.hour%d", i, h),

internal/stats/unit.go

@@ -525,9 +525,8 @@ func (s *StatsCtx) fillCollectedStatsDaily(
 	hours := countHours(curHour, days)
 	units = units[len(units)-hours:]
 
-	for i := 0; i < len(units); i++ {
+	for i, u := range units {
 		day := i / 24
-		u := units[i]
 
 		data.DNSQueries[day] += u.NTotal
 		data.BlockedFiltering[day] += u.NResult[RFiltered]

internal/whois/whois.go

@@ -3,6 +3,7 @@ package whois
 
 import (
 	"bytes"
+	"cmp"
 	"context"
 	"fmt"
 	"io"
@@ -17,7 +18,6 @@ import (
 	"github.com/AdguardTeam/golibs/ioutil"
 	"github.com/AdguardTeam/golibs/log"
 	"github.com/AdguardTeam/golibs/netutil"
-	"github.com/AdguardTeam/golibs/stringutil"
 	"github.com/bluele/gcache"
 )
 
@@ -174,7 +174,7 @@ func whoisParse(data []byte, maxLen int) (info map[string]string) {
 			val = trimValue(val, maxLen)
 		case "descr", "netname":
 			key = "orgname"
-			val = stringutil.Coalesce(orgname, val)
+			val = cmp.Or(orgname, val)
 			orgname = val
 		case "whois":
 			key = "whois"
@@ -232,7 +232,7 @@ func (w *Default) queryAll(ctx context.Context, target string) (info map[string]
 	server := net.JoinHostPort(w.serverAddr, w.portStr)
 	var data []byte
 
-	for i := 0; i < w.maxRedirects; i++ {
+	for range w.maxRedirects {
 		data, err = w.query(ctx, target, server)
 		if err != nil {
 			// Don't wrap the error since it's informative enough as is.

scripts/translations/download.go

@@ -48,7 +48,7 @@ func (c *twoskyClient) download() (err error) {
 	failed := &sync.Map{}
 	uriCh := make(chan *url.URL, len(c.langs))
 
-	for i := 0; i < numWorker; i++ {
+	for range numWorker {
 		wg.Add(1)
 		go downloadWorker(wg, failed, client, uriCh)
 	}

scripts/translations/main.go

@@ -5,6 +5,7 @@ package main
 import (
 	"bufio"
 	"bytes"
+	"cmp"
 	"encoding/json"
 	"fmt"
 	"net/url"
@@ -204,19 +205,13 @@ type twoskyClient struct {
 func (t *twoskyConfig) toClient() (cli *twoskyClient, err error) {
 	defer func() { err = errors.Annotate(err, "filling config: %w") }()
 
-	uriStr := os.Getenv("TWOSKY_URI")
-	if uriStr == "" {
-		uriStr = twoskyURI
-	}
+	uriStr := cmp.Or(os.Getenv("TWOSKY_URI"), twoskyURI)
 	uri, err := url.Parse(uriStr)
 	if err != nil {
 		return nil, err
 	}
 
-	projectID := os.Getenv("TWOSKY_PROJECT_ID")
-	if projectID == "" {
-		projectID = defaultProjectID
-	}
+	projectID := cmp.Or(os.Getenv("TWOSKY_PROJECT_ID"), defaultProjectID)
 
 	baseLang := t.BaseLangcode
 	uLangStr := os.Getenv("UPLOAD_LANGUAGE")