Pull request: all: fix lint and naming issues vol. 4

Merge in DNS/adguard-home from 2276-fix-lint-4 to master

Updates #2276.

Squashed commit of the following:

commit 15d49184cd8ce1f8701bf3221e69418ca1778b36
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Dec 8 15:51:34 2020 +0300

    util: fix naming

commit 3b9a86a0feb8c6e0b167e6e23105e8137b0dda76
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Dec 8 15:41:10 2020 +0300

    all: fix lint and naming issues vol. 4

internal/agherr/agherr.go

@@ -65,3 +65,9 @@ func (e *manyError) Unwrap() error {
 
 	return e.underlying[0]
 }
+
+// wrapper is a copy of the hidden errors.wrapper interface for tests, linting,
+// etc.
+type wrapper interface {
+	Unwrap() error
+}

internal/agherr/agherr_test.go

@@ -41,6 +41,8 @@ func TestError_Error(t *testing.T) {
 }
 
 func TestError_Unwrap(t *testing.T) {
+	var _ wrapper = &manyError{}
+
 	const (
 		errSimple = iota
 		errWrapped

internal/dnsfilter/dnsfilter.go

@@ -129,8 +129,6 @@ const (
 	NotFilteredNotFound Reason = iota
 	// NotFilteredWhiteList - the host is explicitly whitelisted
 	NotFilteredWhiteList
-	// NotFilteredError - there was a transitive error during check
-	NotFilteredError
 
 	// reasons for filtering
 
@@ -777,12 +775,3 @@ func (d *Dnsfilter) Start() {
 		d.registerBlockedServicesHandlers()
 	}
 }
-
-//
-// stats
-//
-
-// GetStats return dns filtering stats since startup.
-func (d *Dnsfilter) GetStats() Stats {
-	return gctx.stats
-}

internal/sysutil/syslog_others.go

@@ -3,8 +3,9 @@
 package sysutil
 
 import (
-	"log"
 	"log/syslog"
+
+	"github.com/AdguardTeam/golibs/log"
 )
 
 func configureSyslog(serviceName string) error {

internal/sysutil/syslog_windows.go

@@ -3,9 +3,9 @@
 package sysutil
 
 import (
-	"log"
 	"strings"
 
+	"github.com/AdguardTeam/golibs/log"
 	"golang.org/x/sys/windows"
 	"golang.org/x/sys/windows/svc/eventlog"
 )

internal/util/helpers.go

@@ -9,7 +9,6 @@ import (
 	"io/ioutil"
 	"os"
 	"os/exec"
-	"path"
 	"runtime"
 	"strings"
 )
@@ -41,13 +40,6 @@ func RunCommand(command string, arguments ...string) (int, string, error) {
 	return cmd.ProcessState.ExitCode(), string(out), nil
 }
 
-func FuncName() string {
-	pc := make([]uintptr, 10) // at least 1 entry needed
-	runtime.Callers(2, pc)
-	f := runtime.FuncForPC(pc[0])
-	return path.Base(f.Name())
-}
-
 // SplitNext - split string by a byte and return the first chunk
 // Skip empty chunks
 // Whitespace is trimmed

internal/util/network_test.go

@@ -1,7 +1,6 @@
 package util
 
 import (
-	"log"
 	"testing"
 )
 
@@ -19,6 +18,6 @@ func TestGetValidNetInterfacesForWeb(t *testing.T) {
 			t.Fatalf("No addresses found for %s", iface.Name)
 		}
 
-		log.Printf("%v", iface)
+		t.Logf("%v", iface)
 	}
 }