plugin/log: support multi nameScope (#2420)

plugin/log/README.md

@@ -23,10 +23,10 @@ log
 Or if you want/need slightly more control:
 
 ~~~ txt
-log [NAME] [FORMAT]
+log [NAMES...] [FORMAT]
 ~~~
 
-* `NAME` is the name to match in order to be logged
+* `NAMES` is the name list to match in order to be logged
 * `FORMAT` is the log format to use (default is Common Log Format), `{common}` is used as a shortcut
   for the Common Log Format. You can also use `{combined}` for a format that adds the query opcode
   `{>opcode}` to the Common Log Format.
@@ -34,7 +34,7 @@ log [NAME] [FORMAT]
 You can further specify the classes of responses that get logged:
 
 ~~~ txt
-log [NAME] [FORMAT] {
+log [NAMES...] [FORMAT] {
     class CLASSES...
 }
 ~~~

plugin/log/setup.go

 package log
 
 import (
+	"strings"
+
 	"github.com/coredns/coredns/core/dnsserver"
 	"github.com/coredns/coredns/plugin"
 	"github.com/coredns/coredns/plugin/pkg/response"
@@ -34,62 +36,75 @@ func logParse(c *caddy.Controller) ([]Rule, error) {
 
 	for c.Next() {
 		args := c.RemainingArgs()
+		length := len(rules)
 
-		if len(args) == 0 {
+		switch len(args) {
+		case 0:
 			// Nothing specified; use defaults
 			rules = append(rules, Rule{
 				NameScope: ".",
 				Format:    DefaultLogFormat,
 				Class:     make(map[response.Class]struct{}),
 			})
-		} else if len(args) == 1 {
+		case 1:
 			rules = append(rules, Rule{
 				NameScope: dns.Fqdn(args[0]),
 				Format:    DefaultLogFormat,
 				Class:     make(map[response.Class]struct{}),
 			})
-		} else {
-			// Name scope, and maybe a format specified
+		default:
+			// Name scopes, and maybe a format specified
 			format := DefaultLogFormat
 
-			switch args[1] {
-			case "{common}":
-				format = CommonLogFormat
-			case "{combined}":
-				format = CombinedLogFormat
-			default:
-				format = args[1]
+			if strings.Contains(args[len(args)-1], "{") {
+				switch args[len(args)-1] {
+				case "{common}":
+					format = CommonLogFormat
+				case "{combined}":
+					format = CombinedLogFormat
+				default:
+					format = args[len(args)-1]
+				}
+
+				args = args[:len(args)-1]
 			}
 
-			rules = append(rules, Rule{
-				NameScope: dns.Fqdn(args[0]),
-				Format:    format,
-				Class:     make(map[response.Class]struct{}),
-			})
+			for _, str := range args {
+				rules = append(rules, Rule{
+					NameScope: dns.Fqdn(str),
+					Format:    format,
+					Class:     make(map[response.Class]struct{}),
+				})
+			}
 		}
 
 		// Class refinements in an extra block.
+		classes := make(map[response.Class]struct{})
 		for c.NextBlock() {
 			switch c.Val() {
 			// class followed by combinations of all, denial, error and success.
 			case "class":
-				classes := c.RemainingArgs()
-				if len(classes) == 0 {
+				classesArgs := c.RemainingArgs()
+				if len(classesArgs) == 0 {
 					return nil, c.ArgErr()
 				}
-				for _, c := range classes {
+				for _, c := range classesArgs {
 					cls, err := response.ClassFromString(c)
 					if err != nil {
 						return nil, err
 					}
-					rules[len(rules)-1].Class[cls] = struct{}{}
+					classes[cls] = struct{}{}
 				}
 			default:
 				return nil, c.ArgErr()
 			}
 		}
-		if len(rules[len(rules)-1].Class) == 0 {
-			rules[len(rules)-1].Class[response.All] = struct{}{}
+		if len(classes) == 0 {
+			classes[response.All] = struct{}{}
+		}
+
+		for i := len(rules) - 1; i >= length; i -= 1 {
+			rules[i].Class = classes
 		}
 	}
 

plugin/log/setup_test.go

@@ -55,6 +55,35 @@ func TestLogParse(t *testing.T) {
 			Format:    "{when}",
 			Class:     map[response.Class]struct{}{response.All: struct{}{}},
 		}}},
+		{`log example.org example.net`, false, []Rule{{
+			NameScope: "example.org.",
+			Format:    DefaultLogFormat,
+			Class:     map[response.Class]struct{}{response.All: struct{}{}},
+		}, {
+			NameScope: "example.net.",
+			Format:    DefaultLogFormat,
+			Class:     map[response.Class]struct{}{response.All: struct{}{}},
+		}}},
+		{`log example.org example.net {host}`, false, []Rule{{
+			NameScope: "example.org.",
+			Format:    "{host}",
+			Class:     map[response.Class]struct{}{response.All: struct{}{}},
+		}, {
+			NameScope: "example.net.",
+			Format:    "{host}",
+			Class:     map[response.Class]struct{}{response.All: struct{}{}},
+		}}},
+		{`log example.org example.net {when} {
+			class denial
+		}`, false, []Rule{{
+			NameScope: "example.org.",
+			Format:    "{when}",
+			Class:     map[response.Class]struct{}{response.Denial: struct{}{}},
+		}, {
+			NameScope: "example.net.",
+			Format:    "{when}",
+			Class:     map[response.Class]struct{}{response.Denial: struct{}{}},
+		}}},
 
 		{`log example.org {
 				class all