Pull request #976: all: imp cyclomatic complexity, minor improvements

Merge in DNS/adguard-home from less-cyclo to master

Updates #2646.

Squashed commit of the following:

commit 42f81c9
Merge: f61e236 42b88c3
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Feb 5 15:07:04 2021 +0300

    Merge branch 'master' into less-cyclo

commit f61e236
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Feb 5 15:06:02 2021 +0300

    home: imp docs

commit e3c2310
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Jan 27 21:14:30 2021 +0300

    all: imp cyclomatic complexity, minor improvements

internal/dhcpd/dhcphttp.go

@@ -90,6 +90,28 @@ type dhcpServerConfigJSON struct {
 	V6            v6ServerConfJSON `json:"v6"`
 }
 
+func (s *Server) enableDHCP(ifaceName string) (code int, err error) {
+	var hasStaticIP bool
+	hasStaticIP, err = sysutil.IfaceHasStaticIP(ifaceName)
+	if err != nil {
+		return http.StatusInternalServerError, fmt.Errorf("checking static ip: %w", err)
+	}
+
+	if !hasStaticIP {
+		err = sysutil.IfaceSetStaticIP(ifaceName)
+		if err != nil {
+			return http.StatusInternalServerError, fmt.Errorf("setting static ip: %w", err)
+		}
+	}
+
+	err = s.Start()
+	if err != nil {
+		return http.StatusBadRequest, fmt.Errorf("starting dhcp server: %w", err)
+	}
+
+	return 0, nil
+}
+
 func (s *Server) handleDHCPSetConfig(w http.ResponseWriter, r *http.Request) {
 	newconfig := dhcpServerConfigJSON{}
 	newconfig.Enabled = s.conf.Enabled
@@ -98,6 +120,7 @@ func (s *Server) handleDHCPSetConfig(w http.ResponseWriter, r *http.Request) {
 	js, err := jsonutil.DecodeObject(&newconfig, r.Body)
 	if err != nil {
 		httpError(r, w, http.StatusBadRequest, "Failed to parse new DHCP config json: %s", err)
+
 		return
 	}
 
@@ -112,6 +135,7 @@ func (s *Server) handleDHCPSetConfig(w http.ResponseWriter, r *http.Request) {
 		if len(v4conf.RangeStart) == 0 {
 			v4conf.Enabled = false
 		}
+
 		v4Enabled = v4conf.Enabled
 		v4conf.InterfaceName = newconfig.InterfaceName
 
@@ -122,7 +146,8 @@ func (s *Server) handleDHCPSetConfig(w http.ResponseWriter, r *http.Request) {
 
 		s4, err = v4Create(v4conf)
 		if err != nil {
-			httpError(r, w, http.StatusBadRequest, "Invalid DHCPv4 configuration: %s", err)
+			httpError(r, w, http.StatusBadRequest, "invalid dhcpv4 configuration: %s", err)
+
 			return
 		}
 	}
@@ -133,18 +158,22 @@ func (s *Server) handleDHCPSetConfig(w http.ResponseWriter, r *http.Request) {
 		if len(v6conf.RangeStart) == 0 {
 			v6conf.Enabled = false
 		}
+
 		v6Enabled = v6conf.Enabled
 		v6conf.InterfaceName = newconfig.InterfaceName
 		v6conf.notify = s.onNotify
+
 		s6, err = v6Create(v6conf)
 		if err != nil {
-			httpError(r, w, http.StatusBadRequest, "Invalid DHCPv6 configuration: %s", err)
+			httpError(r, w, http.StatusBadRequest, "invalid dhcpv6 configuration: %s", err)
+
 			return
 		}
 	}
 
 	if newconfig.Enabled && !v4Enabled && !v6Enabled {
-		httpError(r, w, http.StatusBadRequest, "DHCPv4 or DHCPv6 configuration must be complete")
+		httpError(r, w, http.StatusBadRequest, "dhcpv4 or dhcpv6 configuration must be complete")
+
 		return
 	}
 
@@ -161,25 +190,20 @@ func (s *Server) handleDHCPSetConfig(w http.ResponseWriter, r *http.Request) {
 	if s4 != nil {
 		s.srv4 = s4
 	}
+
 	if s6 != nil {
 		s.srv6 = s6
 	}
+
 	s.conf.ConfigModified()
 	s.dbLoad()
 
 	if s.conf.Enabled {
-		staticIP, err := sysutil.IfaceHasStaticIP(newconfig.InterfaceName)
-		if !staticIP && err == nil {
-			err = sysutil.IfaceSetStaticIP(newconfig.InterfaceName)
-			if err != nil {
-				httpError(r, w, http.StatusInternalServerError, "Failed to configure static IP: %s", err)
-				return
-			}
-		}
-
-		err = s.Start()
+		var code int
+		code, err = s.enableDHCP(newconfig.InterfaceName)
 		if err != nil {
-			httpError(r, w, http.StatusBadRequest, "Failed to start DHCP server: %s", err)
+			httpError(r, w, code, "enabling dhcp: %s", err)
+
 			return
 		}
 	}

internal/home/whois.go

@@ -83,36 +83,33 @@ func whoisParse(data string) map[string]string {
 		switch k {
 		case "org-name":
 			m["orgname"] = trimValue(v)
-		case "orgname":
-			fallthrough
-		case "city":
-			fallthrough
-		case "country":
+		case "city", "country", "orgname":
 			m[k] = trimValue(v)
-
 		case "descr":
 			if len(descr) == 0 {
 				descr = v
 			}
 		case "netname":
 			netname = v
-
 		case "whois": // "whois: whois.arin.net"
 			m["whois"] = v
-
 		case "referralserver": // "ReferralServer:  whois://whois.ripe.net"
 			if strings.HasPrefix(v, "whois://") {
 				m["whois"] = v[len("whois://"):]
 			}
 		}
 	}
 
-	// descr or netname -> orgname
 	_, ok := m["orgname"]
-	if !ok && len(descr) != 0 {
-		m["orgname"] = trimValue(descr)
-	} else if !ok && len(netname) != 0 {
-		m["orgname"] = trimValue(netname)
+	if !ok {
+		// Set orgname from either descr or netname for the frontent.
+		//
+		// TODO(a.garipov): Perhaps don't do that in the V1 HTTP API?
+		if descr != "" {
+			m["orgname"] = trimValue(descr)
+		} else if netname != "" {
+			m["orgname"] = trimValue(netname)
+		}
 	}
 
 	return m

scripts/make/go-lint.sh

@@ -132,7 +132,7 @@ golint --set_exit_status ./...
 
 "$GO" vet ./...
 
-gocyclo --over 20 .
+gocyclo --over 19 .
 
 gosec --quiet .