all: sync with master

internal/dhcpsvc/config.go

@@ -2,11 +2,12 @@ package dhcpsvc
 
 import (
 	"fmt"
-	"slices"
+	"log/slog"
 	"time"
 
+	"github.com/AdguardTeam/golibs/errors"
+	"github.com/AdguardTeam/golibs/mapsutil"
 	"github.com/AdguardTeam/golibs/netutil"
-	"golang.org/x/exp/maps"
 )
 
 // Config is the configuration for the DHCP service.
@@ -15,6 +16,9 @@ type Config struct {
 	// interface identified by its name.
 	Interfaces map[string]*InterfaceConfig
 
+	// Logger will be used to log the DHCP events.
+	Logger *slog.Logger
+
 	// LocalDomainName is the top-level domain name to use for resolving DHCP
 	// clients' hostnames.
 	LocalDomainName string
@@ -38,36 +42,44 @@ type InterfaceConfig struct {
 }
 
 // Validate returns an error in conf if any.
+//
+// TODO(e.burkov):  Unexport and rewrite the test.
 func (conf *Config) Validate() (err error) {
 	switch {
 	case conf == nil:
 		return errNilConfig
 	case !conf.Enabled:
 		return nil
-	case conf.ICMPTimeout < 0:
-		return newMustErr("icmp timeout", "be non-negative", conf.ICMPTimeout)
+	}
+
+	var errs []error
+	if conf.ICMPTimeout < 0 {
+		err = newMustErr("icmp timeout", "be non-negative", conf.ICMPTimeout)
+		errs = append(errs, err)
 	}
 
 	err = netutil.ValidateDomainName(conf.LocalDomainName)
 	if err != nil {
 		// Don't wrap the error since it's informative enough as is.
-		return err
+		errs = append(errs, err)
 	}
 
 	if len(conf.Interfaces) == 0 {
-		return errNoInterfaces
+		errs = append(errs, errNoInterfaces)
+
+		return errors.Join(errs...)
 	}
 
-	ifaces := maps.Keys(conf.Interfaces)
-	slices.Sort(ifaces)
-
-	for _, iface := range ifaces {
-		if err = conf.Interfaces[iface].validate(); err != nil {
-			return fmt.Errorf("interface %q: %w", iface, err)
+	mapsutil.SortedRange(conf.Interfaces, func(iface string, ic *InterfaceConfig) (ok bool) {
+		err = ic.validate()
+		if err != nil {
+			errs = append(errs, fmt.Errorf("interface %q: %w", iface, err))
 		}
-	}
 
-	return nil
+		return true
+	})
+
+	return errors.Join(errs...)
 }
 
 // validate returns an error in ic, if any.