all: implement sub command to remove caches by domain name

The "caches" command accept second sub command "remove" that accept
single domain name to be removed from caches.

This changes affect the HTTP API for caches delete to return the removed
answer on the response data.

2 files changed, 38 insertions, 0 deletions

diff --git a/cmd/resolver/main.go b/cmd/resolver/main.go
index 322ef85..0be5375 100644
--- a/cmd/resolver/main.go
+++ b/cmd/resolver/main.go
@@ -19,6 +19,7 @@ const (
 	cmdQuery  = "query"
 
 	subCmdSearch = "search"
+	subCmdRemove = "remove"
 )
 
 func main() {
@@ -63,12 +64,23 @@ func main() {
 
 		subCmd = strings.ToLower(args[0])
 		switch subCmd {
+		case subCmdRemove:
+			args = args[1:]
+			if len(args) == 0 {
+				log.Fatalf("resolver: %s %s: missing argument", rsol.cmd, subCmd)
+			}
+			rsol.doCmdCachesRemove(args[0])
+
 		case subCmdSearch:
 			args = args[1:]
 			if len(args) == 0 {
 				log.Fatalf("resolver: %s %s: missing argument", rsol.cmd, subCmd)
 			}
 			rsol.doCmdCachesSearch(args[0])
+
+		default:
+			log.Printf("resolver: %s: unknown sub command: %s", rsol.cmd, subCmd)
+			os.Exit(2)
 		}
 
 	case cmdQuery:
@@ -148,6 +160,10 @@ caches search <string>
 	This command can also be used to inspect each DNS message on the
 	caches.
 
+caches remove <string>
+
+	Remove the domain name from rescached caches.
+
 
 ==  Examples
 
diff --git a/cmd/resolver/resolver.go b/cmd/resolver/resolver.go
index 5ba632f..8804851 100644
--- a/cmd/resolver/resolver.go
+++ b/cmd/resolver/resolver.go
@@ -61,6 +61,28 @@ func (rsol *resolver) doCmdCaches() {
 	printAnswers(answers)
 }
 
+// doCmdCachesRemove remove an answer from caches by domain name.
+func (rsol *resolver) doCmdCachesRemove(q string) {
+	var (
+		resc = rsol.newRescachedClient()
+
+		listAnswer []*dns.Answer
+		err        error
+	)
+
+	listAnswer, err = resc.CachesRemove(q)
+	if err != nil {
+		log.Printf("resolver: caches: %s", err)
+		return
+	}
+
+	fmt.Printf("Total answer removed: %d\n", len(listAnswer))
+	if len(listAnswer) == 0 {
+		return
+	}
+	printAnswers(listAnswer)
+}
+
 // doCmdCachesSearch call the rescached HTTP API to search the caches by
 // domain name.
 func (rsol *resolver) doCmdCachesSearch(q string) {