Fix ineffassign (#1959)

* Fix ineffassign

This fix tries to fix ineffassign, as was reported in:
https://goreportcard.com/report/github.com/coredns/coredns#ineffassignSigned-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update setup.go

Revert this one change, so this can be merged.

plugin/federation/setup.go

@@ -50,7 +50,7 @@ func federationParse(c *caddy.Controller) (*Federation, error) {
 	for c.Next() {
 		// federation [zones..]
 		zones := c.RemainingArgs()
-		origins := []string{}
+		var origins []string
 		if len(zones) > 0 {
 			origins = make([]string, len(zones))
 			copy(origins, zones)

plugin/file/setup.go

@@ -53,7 +53,6 @@ func setup(c *caddy.Controller) error {
 func fileParse(c *caddy.Controller) (Zones, error) {
 	z := make(map[string]*Zone)
 	names := []string{}
-	origins := []string{}
 
 	config := dnsserver.GetConfig(c)
 
@@ -64,7 +63,7 @@ func fileParse(c *caddy.Controller) (Zones, error) {
 		}
 		fileName := c.Val()
 
-		origins = make([]string, len(c.ServerBlockKeys))
+		origins := make([]string, len(c.ServerBlockKeys))
 		copy(origins, c.ServerBlockKeys)
 		args := c.RemainingArgs()
 		if len(args) > 0 {

plugin/file/zone.go

@@ -203,7 +203,7 @@ func (z *Zone) nameFromRight(qname string, i int) (string, bool) {
 	}
 
 	k := 0
-	shot := false
+	var shot bool
 	for j := 1; j <= i; j++ {
 		k, shot = dns.PrevLabel(qname, j+z.origLen)
 		if shot {

plugin/normalize.go

@@ -125,7 +125,8 @@ func SplitHostPort(s string) (host, port string, ipnet *net.IPNet, err error) {
 			// Get the first lower octet boundary to see what encompassing zone we should be authoritative for.
 			mod := (bits - ones) % sizeDigit
 			nearest := (bits - ones) + mod
-			offset, end := 0, false
+			offset := 0
+			var end bool
 			for i := 0; i < nearest/sizeDigit; i++ {
 				offset, end = dns.NextLabel(rev, offset)
 				if end {

plugin/proxy/lookup.go

@@ -71,7 +71,7 @@ func (p Proxy) lookup(state request.Request) (*dns.Msg, error) {
 	}
 	for {
 		start := time.Now()
-		reply := new(dns.Msg)
+		var reply *dns.Msg
 		var backendErr error
 
 		// Since Select() should give us "up" hosts, keep retrying

plugin/proxy/proxy.go

@@ -70,7 +70,7 @@ func (p Proxy) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
 
 	for {
 		start := time.Now()
-		reply := new(dns.Msg)
+		var reply *dns.Msg
 		var backendErr error
 
 		// Since Select() should give us "up" hosts, keep retrying

plugin/secondary/setup.go

@@ -49,13 +49,12 @@ func setup(c *caddy.Controller) error {
 func secondaryParse(c *caddy.Controller) (file.Zones, error) {
 	z := make(map[string]*file.Zone)
 	names := []string{}
-	origins := []string{}
 	upstr := upstream.Upstream{}
 	for c.Next() {
 
 		if c.Val() == "secondary" {
 			// secondary [origin]
-			origins = make([]string, len(c.ServerBlockKeys))
+			origins := make([]string, len(c.ServerBlockKeys))
 			copy(origins, c.ServerBlockKeys)
 			args := c.RemainingArgs()
 			if len(args) > 0 {

test/server_reverse_test.go

@@ -74,10 +74,8 @@ func TestReverse(t *testing.T) {
 
 	m := new(dns.Msg)
 	for i, tc := range tests {
-		inaddr := tc.addr
-		var err error
 		if !strings.HasSuffix(tc.addr, ".arpa.") {
-			inaddr, err = dns.ReverseAddr(tc.addr)
+			inaddr, err := dns.ReverseAddr(tc.addr)
 			if err != nil {
 				t.Fatalf("Test %d, failed to convert %s", i, tc.addr)
 			}
@@ -122,10 +120,8 @@ func TestReverseInAddr(t *testing.T) {
 
 	m := new(dns.Msg)
 	for i, tc := range tests {
-		inaddr := tc.addr
-		var err error
 		if !strings.HasSuffix(tc.addr, ".arpa.") {
-			inaddr, err = dns.ReverseAddr(tc.addr)
+			inaddr, err := dns.ReverseAddr(tc.addr)
 			if err != nil {
 				t.Fatalf("Test %d, failed to convert %s", i, tc.addr)
 			}