Fix bug with prepared queries using sameness-groups. (#19970)

This commit fixes an issue where the partition was not properly set
on the peering query failover target created from sameness-groups.
Before this change, it was always empty, meaning that the data
would be queried with respect to the default partition always. This
resulted in a situation where a PQ that was attempting to use a
sameness-group for failover would select peers from the default
partition, rather than the partition of the sameness-group itself.

.changelog/_7773.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+prepared-query: (Enterprise-only) Fix issue where sameness-group failover targets to peers would attempt to query data from the default partition, rather than the sameness-group's partition always.
+```

agent/consul/prepared_query_endpoint_test.go

@@ -3357,6 +3357,7 @@ type executeServers struct {
 
 func createExecuteServers(t *testing.T) *executeServers {
 	es := newExecuteServers(t)
+	es.initPeering(t, "")
 	es.initWanFed(t)
 	es.exportPeeringServices(t)
 	es.initTokens(t)
@@ -3365,7 +3366,6 @@ func createExecuteServers(t *testing.T) *executeServers {
 }
 
 func newExecuteServers(t *testing.T) *executeServers {
-
 	// Setup server
 	dir1, s1 := testServerWithConfig(t, func(c *Config) {
 		c.PrimaryDatacenter = "dc1"
@@ -3416,67 +3416,6 @@ func newExecuteServers(t *testing.T) *executeServers {
 	testrpc.WaitForLeader(t, s1.RPC, "dc1", testrpc.WithToken("root"))
 	testrpc.WaitForLeader(t, s3.RPC, "dc3")
 
-	acceptingPeerName := "my-peer-accepting-server"
-	dialingPeerName := "my-peer-dialing-server"
-
-	// Set up peering between dc1 (dialing) and dc3 (accepting) and export the foo service
-	{
-		// Create a peering by generating a token.
-		ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
-		t.Cleanup(cancel)
-
-		options := structs.QueryOptions{Token: "root"}
-		ctx, err := grpcexternal.ContextWithQueryOptions(ctx, options)
-		require.NoError(t, err)
-
-		conn, err := grpc.DialContext(ctx, s3.config.RPCAddr.String(),
-			grpc.WithContextDialer(newServerDialer(s3.config.RPCAddr.String())),
-			//nolint:staticcheck
-			grpc.WithInsecure(),
-			grpc.WithBlock())
-		require.NoError(t, err)
-		t.Cleanup(func() {
-			conn.Close()
-		})
-
-		peeringClient := pbpeering.NewPeeringServiceClient(conn)
-		req := pbpeering.GenerateTokenRequest{
-			PeerName: dialingPeerName,
-		}
-		resp, err := peeringClient.GenerateToken(ctx, &req)
-		require.NoError(t, err)
-
-		conn, err = grpc.DialContext(ctx, s1.config.RPCAddr.String(),
-			grpc.WithContextDialer(newServerDialer(s1.config.RPCAddr.String())),
-			//nolint:staticcheck
-			grpc.WithInsecure(),
-			grpc.WithBlock())
-		require.NoError(t, err)
-		t.Cleanup(func() {
-			conn.Close()
-		})
-
-		peeringClient = pbpeering.NewPeeringServiceClient(conn)
-		establishReq := pbpeering.EstablishRequest{
-			PeerName:     acceptingPeerName,
-			PeeringToken: resp.PeeringToken,
-		}
-		establishResp, err := peeringClient.Establish(ctx, &establishReq)
-		require.NoError(t, err)
-		require.NotNil(t, establishResp)
-
-		readResp, err := peeringClient.PeeringRead(ctx, &pbpeering.PeeringReadRequest{Name: acceptingPeerName})
-		require.NoError(t, err)
-		require.NotNil(t, readResp)
-
-		// Wait for the stream to be connected.
-		retry.Run(t, func(r *retry.R) {
-			status, found := s1.peerStreamServer.StreamStatus(readResp.GetPeering().GetID())
-			require.True(r, found)
-			require.True(r, status.Connected)
-		})
-	}
-
 	es := executeServers{
 		server: &serverTestMetadata{
 			server:     s1,
@@ -3487,8 +3426,8 @@ func newExecuteServers(t *testing.T) *executeServers {
 			server:            s3,
 			codec:             codec3,
 			datacenter:        "dc3",
-			dialingPeerName:   dialingPeerName,
-			acceptingPeerName: acceptingPeerName,
+			dialingPeerName:   "my-peer-dialing-server",
+			acceptingPeerName: "my-peer-accepting-server",
 		},
 	}
 
@@ -3562,3 +3501,64 @@ func (es *executeServers) initWanFed(t *testing.T) {
 		datacenter: "dc2",
 	}
 }
+
+func (es *executeServers) initPeering(t *testing.T, localPartition string) {
+	// Create a peering by generating a token.
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	t.Cleanup(cancel)
+
+	options := structs.QueryOptions{Token: "root"}
+	ctx, err := grpcexternal.ContextWithQueryOptions(ctx, options)
+	require.NoError(t, err)
+
+	conn, err := grpc.DialContext(ctx, es.peeringServer.server.config.RPCAddr.String(),
+		grpc.WithContextDialer(newServerDialer(es.peeringServer.server.config.RPCAddr.String())),
+		//nolint:staticcheck
+		grpc.WithInsecure(),
+		grpc.WithBlock())
+	require.NoError(t, err)
+	t.Cleanup(func() {
+		conn.Close()
+	})
+
+	peeringClient := pbpeering.NewPeeringServiceClient(conn)
+	req := pbpeering.GenerateTokenRequest{
+		PeerName: es.peeringServer.dialingPeerName,
+	}
+	resp, err := peeringClient.GenerateToken(ctx, &req)
+	require.NoError(t, err)
+
+	conn, err = grpc.DialContext(ctx, es.server.server.config.RPCAddr.String(),
+		grpc.WithContextDialer(newServerDialer(es.server.server.config.RPCAddr.String())),
+		//nolint:staticcheck
+		grpc.WithInsecure(),
+		grpc.WithBlock())
+	require.NoError(t, err)
+	t.Cleanup(func() {
+		conn.Close()
+	})
+
+	peeringClient = pbpeering.NewPeeringServiceClient(conn)
+	establishReq := pbpeering.EstablishRequest{
+		Partition:    localPartition,
+		PeerName:     es.peeringServer.acceptingPeerName,
+		PeeringToken: resp.PeeringToken,
+	}
+	establishResp, err := peeringClient.Establish(ctx, &establishReq)
+	require.NoError(t, err)
+	require.NotNil(t, establishResp)
+
+	readResp, err := peeringClient.PeeringRead(ctx, &pbpeering.PeeringReadRequest{
+		Partition: localPartition,
+		Name:      es.peeringServer.acceptingPeerName,
+	})
+	require.NoError(t, err)
+	require.NotNil(t, readResp)
+
+	// Wait for the stream to be connected.
+	retry.Run(t, func(r *retry.R) {
+		status, found := es.server.server.peerStreamServer.StreamStatus(readResp.GetPeering().GetID())
+		require.True(r, found)
+		require.True(r, status.Connected)
+	})
+}