add query totals by group

examples/gettotl/main.go

@@ -4,6 +4,14 @@
 // that can be found in the LICENSE file in the root of the source
 // tree.
 
+// This example returns the values of a "group" of totl counts/values
+// given a 2 uint64 id group tuple.  Or it will return the single value
+// for a unique 3 uint64 id triple.
+
+// id1    id2    id3
+// |--group--|
+// |--specific id---|
+
 package main
 
 import (
@@ -16,8 +24,9 @@ import (
 )
 
 func main() {
-	if len(os.Args) != 5 || os.Args[1] == "-h" {
-		fmt.Fprintln(os.Stderr, "usage:", os.Args[0], "<scoutfs mount point> <id1> <id2> <id3>")
+	if (len(os.Args) != 4 && len(os.Args) != 5) || os.Args[1] == "-h" {
+		fmt.Fprintln(os.Stderr, "usage:", os.Args[0],
+			"<scoutfs mount point> <id1> <id2> or <scoutfs mount point> <id1> <id2> <id3>")
 		os.Exit(1)
 	}
 
@@ -35,16 +44,33 @@ func main() {
 	if err != nil {
 		log.Fatalln("error parsing id2:", err)
 	}
+
+	if len(os.Args) == 4 {
+		tg := scoutfs.NewTotalsGroup(f, u1, u2, 10)
+		for {
+			ttls, err := tg.Next()
+			if err != nil {
+				log.Fatalln("error read totals:", err)
+			}
+			if ttls == nil {
+				break
+			}
+			for _, t := range ttls {
+				fmt.Println("id:", t.ID[2], "xattrs match:", t.Count, "total value:", t.Total)
+			}
+		}
+		return
+	}
+
 	u3, err := strconv.ParseUint(os.Args[4], 10, 64)
 	if err != nil {
-		log.Fatalln("error parsing id3:", err)
+		log.Fatalln("error parsing id2:", err)
 	}
 
 	t, err := scoutfs.ReadXattrTotals(f, u1, u2, u3)
 	if err != nil {
-		log.Fatalln("error read totals:", err)
+		log.Fatalln("error reading totals:", err)
 	}
-
-	fmt.Println("xattrs match: ", t.Count)
-	fmt.Println("total value : ", t.Total)
+	fmt.Println("Count", t.Count)
+	fmt.Println("Total", t.Total)
 }