plugin: cleanup code based on staticcheck warnings (#3302)

TrimPrefix re-assign to former variable
Signed-off-by: Guangming Wang <guangming.wang@daocloud.io>

plugin/acl/acl_test.go

@@ -27,9 +27,7 @@ func (t *testResponseWriter) WriteMsg(m *dns.Msg) error {
 
 func NewTestControllerWithZones(input string, zones []string) *caddy.Controller {
 	ctr := caddy.NewTestController("dns", input)
-	for _, zone := range zones {
-		ctr.ServerBlockKeys = append(ctr.ServerBlockKeys, zone)
-	}
+	ctr.ServerBlockKeys = append(ctr.ServerBlockKeys, zones...)
 	return ctr
 }
 

plugin/dnstap/setup.go

@@ -46,9 +46,7 @@ func parseConfig(d *caddyfile.Dispenser) (c config, err error) {
 		c.target = servers[0]
 	} else {
 		// default to UNIX socket
-		if strings.HasPrefix(c.target, "unix://") {
-			c.target = c.target[7:]
-		}
+		c.target = strings.TrimPrefix(c.target, "unix://")
 		c.socket = true
 	}
 

plugin/etcd/etcd.go

@@ -83,7 +83,7 @@ func (e *Etcd) Records(ctx context.Context, state request.Request, exact bool) (
 func (e *Etcd) get(ctx context.Context, path string, recursive bool) (*etcdcv3.GetResponse, error) {
 	ctx, cancel := context.WithTimeout(ctx, etcdTimeout)
 	defer cancel()
-	if recursive == true {
+	if recursive {
 		if !strings.HasSuffix(path, "/") {
 			path = path + "/"
 		}

plugin/file/xfr.go

@@ -45,8 +45,8 @@ func (x Xfr) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (in
 	ch := make(chan *dns.Envelope)
 	tr := new(dns.Transfer)
 	wg := new(sync.WaitGroup)
+	wg.Add(1)
 	go func() {
-		wg.Add(1)
 		tr.Out(w, r, ch)
 		wg.Done()
 	}()

plugin/hosts/hostsfile.go

@@ -244,8 +244,8 @@ func (h *Hostsfile) LookupStaticAddr(addr string) []string {
 
 	h.RLock()
 	defer h.RUnlock()
-	hosts1, _ := h.hmap.addr[addr]
-	hosts2, _ := h.inline.addr[addr]
+	hosts1 := h.hmap.addr[addr]
+	hosts2 := h.inline.addr[addr]
 
 	if len(hosts1) == 0 && len(hosts2) == 0 {
 		return nil