grpc: add clientconn.CanonicalTarget() to return the canonical target string (#7006)

Author: arvindbr8

clientconn.go

@@ -883,13 +883,13 @@ func (cc *ClientConn) channelzMetric() *channelz.ChannelInternalMetric {
 	}
 }
 
-// Target returns the canonical target string of the ClientConn.
-//
-// # Experimental
-//
-// Notice: This API is EXPERIMENTAL and may be changed or removed in a
-// later release.
+// Target returns the target string of the ClientConn.
 func (cc *ClientConn) Target() string {
+	return cc.target
+}
+
+// CanonicalTarget returns the canonical target string of the ClientConn.
+func (cc *ClientConn) CanonicalTarget() string {
 	return cc.parsedTarget.String()
 }
 
@@ -1744,6 +1744,7 @@ func (cc *ClientConn) parseTargetAndFindResolver() error {
 	defScheme := resolver.GetDefaultScheme()
 	channelz.Infof(logger, cc.channelzID, "fallback to scheme %q", defScheme)
 	canonicalTarget := defScheme + ":///" + cc.target
+
 	parsedTarget, err = parseTarget(canonicalTarget)
 	if err != nil {
 		channelz.Infof(logger, cc.channelzID, "dial target %q parse failed: %v", canonicalTarget, err)

clientconn_test.go

@@ -808,31 +808,31 @@ func (s) TestMethodConfigDefaultService(t *testing.T) {
 	}
 }
 
-func (s) TestClientConn_Target(t *testing.T) {
+func (s) TestClientConnCanonicalTarget(t *testing.T) {
 	tests := []struct {
-		name       string
-		addr       string
-		targetWant string
+		name                string
+		addr                string
+		canonicalTargetWant string
 	}{
 		{
-			name:       "normal-case",
-			addr:       "dns://a.server.com/google.com",
-			targetWant: "dns://a.server.com/google.com",
+			name:                "normal-case",
+			addr:                "dns://a.server.com/google.com",
+			canonicalTargetWant: "dns://a.server.com/google.com",
 		},
 		{
-			name:       "canonical-target-not-specified",
-			addr:       "no.scheme",
-			targetWant: "passthrough:///no.scheme",
+			name:                "canonical-target-not-specified",
+			addr:                "no.scheme",
+			canonicalTargetWant: "passthrough:///no.scheme",
 		},
 		{
-			name:       "canonical-target-nonexistent",
-			addr:       "nonexist:///non.existent",
-			targetWant: "passthrough:///nonexist:///non.existent",
+			name:                "canonical-target-nonexistent",
+			addr:                "nonexist:///non.existent",
+			canonicalTargetWant: "passthrough:///nonexist:///non.existent",
 		},
 		{
-			name:       "canonical-target-add-colon-slash",
-			addr:       "dns:hostname:port",
-			targetWant: "dns:///hostname:port",
+			name:                "canonical-target-add-colon-slash",
+			addr:                "dns:hostname:port",
+			canonicalTargetWant: "dns:///hostname:port",
 		},
 	}
 	for _, test := range tests {
@@ -842,8 +842,11 @@ func (s) TestClientConn_Target(t *testing.T) {
 				t.Fatalf("Dial(%s, _) = _, %v, want _, <nil>", test.addr, err)
 			}
 			defer cc.Close()
-			if cc.Target() != test.targetWant {
-				t.Fatalf("Target() = %s, want %s", cc.Target(), test.targetWant)
+			if cc.Target() != test.addr {
+				t.Fatalf("Target() = %s, want %s", cc.Target(), test.addr)
+			}
+			if cc.CanonicalTarget() != test.canonicalTargetWant {
+				t.Fatalf("CanonicalTarget() = %s, want %s", cc.CanonicalTarget(), test.canonicalTargetWant)
 			}
 		})
 	}