Add the route ID to uuid

dispatch/route.go

@@ -180,6 +180,29 @@ func (r *Route) Key() string {
 	return b.String()
 }
 
+// ID returns a unique identifier for the route.
+func (r *Route) ID() string {
+	b := strings.Builder{}
+
+	position := -1
+	if r.parent != nil {
+		// Find the position in the same level leaf.
+		for i, cr := range r.parent.Routes {
+			if cr == r {
+				position = i
+				break
+			}
+		}
+	}
+	b.WriteString(r.Key())
+
+	if position > -1 {
+		b.WriteRune('/')
+		b.WriteString(fmt.Sprint(position))
+	}
+	return b.String()
+}
+
 // Walk traverses the route tree in depth-first order.
 func (r *Route) Walk(visit func(*Route)) {
 	visit(r)

dispatch/route_test.go

@@ -853,3 +853,71 @@ routes:
 		}
 	}
 }
+
+func TestRouteID(t *testing.T) {
+	in := `
+receiver: 'notify-def'
+
+routes:
+- matchers: ['{owner="team-A"}', '{level!="critical"}']
+  receiver: 'notify-D'
+  group_by: [...]
+  continue: true
+- matchers: ['{owner="team-A"}', '{level!="critical"}']
+  receiver: 'notify-A'
+  routes:
+  - matchers: ['{env="testing"}', '{baz!~".*quux"}']
+    receiver: 'notify-testing'
+    group_by: [...]
+  - match:
+      env: "production"
+    receiver: 'notify-productionA'
+    group_wait: 1m
+    continue: true
+  - matchers: [ env=~"produ.*", job=~".*"]
+    receiver: 'notify-productionB'
+    group_wait: 30s
+    group_interval: 5m
+    repeat_interval: 1h
+    group_by: ['job']
+- match_re:
+    owner: 'team-(B|C)'
+  group_by: ['foo', 'bar']
+  group_wait: 2m
+  receiver: 'notify-BC'
+- matchers: [group_by="role"]
+  group_by: ['role']
+  routes:
+  - matchers: ['{env="testing"}']
+    receiver: 'notify-testing'
+    routes:
+    - matchers: [wait="long"]
+      group_wait: 2m
+`
+
+	var ctree config.Route
+	if err := yaml.UnmarshalStrict([]byte(in), &ctree); err != nil {
+		t.Fatal(err)
+	}
+	tree := NewRoute(&ctree, nil)
+
+	expected := []string{
+		"{}",
+		"{}/{level!=\"critical\",owner=\"team-A\"}/0",
+		"{}/{level!=\"critical\",owner=\"team-A\"}/1",
+		"{}/{level!=\"critical\",owner=\"team-A\"}/{baz!~\".*quux\",env=\"testing\"}/0",
+		"{}/{level!=\"critical\",owner=\"team-A\"}/{env=\"production\"}/1",
+		"{}/{level!=\"critical\",owner=\"team-A\"}/{env=~\"produ.*\",job=~\".*\"}/2",
+		"{}/{owner=~\"^(?:team-(B|C))$\"}/2",
+		"{}/{group_by=\"role\"}/3",
+		"{}/{group_by=\"role\"}/{env=\"testing\"}/0",
+		"{}/{group_by=\"role\"}/{env=\"testing\"}/{wait=\"long\"}/0",
+	}
+
+	var got []string
+	tree.Walk(func(r *Route) {
+		got = append(got, r.ID())
+	})
+
+	require.ElementsMatch(t, got, expected)
+}