package consul import ( "fmt" "math/rand" "os" "reflect" "strings" "testing" "time" "github.com/hashicorp/consul/consul/structs" "github.com/hashicorp/consul/testutil" "github.com/hashicorp/net-rpc-msgpackrpc" "github.com/hashicorp/serf/coordinate" ) // generateRandomCoordinate creates a random coordinate. This mucks with the // underlying structure directly, so it's not really useful for any particular // position in the network, but it's a good payload to send through to make // sure things come out the other side or get stored correctly. func generateRandomCoordinate() *coordinate.Coordinate { config := coordinate.DefaultConfig() coord := coordinate.NewCoordinate(config) for i := range coord.Vec { coord.Vec[i] = rand.NormFloat64() } coord.Error = rand.NormFloat64() coord.Adjustment = rand.NormFloat64() return coord } // verifyCoordinatesEqual will compare a and b and fail if they are not exactly // equal (no floating point fuzz is considered since we are trying to make sure // we are getting exactly the coordinates we expect, without math on them). func verifyCoordinatesEqual(t *testing.T, a, b *coordinate.Coordinate) { if !reflect.DeepEqual(a, b) { t.Fatalf("coordinates are not equal: %v != %v", a, b) } } func TestCoordinate_Update(t *testing.T) { name := fmt.Sprintf("Node %d", getPort()) dir1, config1 := testServerConfig(t, name) defer os.RemoveAll(dir1) config1.CoordinateUpdatePeriod = 500 * time.Millisecond config1.CoordinateUpdateBatchSize = 5 config1.CoordinateUpdateMaxBatches = 2 s1, err := NewServer(config1) if err != nil { t.Fatal(err) } defer s1.Shutdown() codec := rpcClient(t, s1) defer codec.Close() testutil.WaitForLeader(t, s1.RPC, "dc1") // Register some nodes. nodes := []string{"node1", "node2"} for _, node := range nodes { req := structs.RegisterRequest{ Datacenter: "dc1", Node: node, Address: "127.0.0.1", } var reply struct{} if err := msgpackrpc.CallWithCodec(codec, "Catalog.Register", &req, &reply); err != nil { t.Fatalf("err: %v", err) } } // Send an update for the first node. arg1 := structs.CoordinateUpdateRequest{ Datacenter: "dc1", Node: "node1", Coord: generateRandomCoordinate(), } var out struct{} if err := msgpackrpc.CallWithCodec(codec, "Coordinate.Update", &arg1, &out); err != nil { t.Fatalf("err: %v", err) } // Send an update for the second node. arg2 := structs.CoordinateUpdateRequest{ Datacenter: "dc1", Node: "node2", Coord: generateRandomCoordinate(), } if err := msgpackrpc.CallWithCodec(codec, "Coordinate.Update", &arg2, &out); err != nil { t.Fatalf("err: %v", err) } // Make sure the updates did not yet apply because the update period // hasn't expired. state := s1.fsm.State() c, err := state.CoordinateGetRaw("node1") if err != nil { t.Fatalf("err: %v", err) } if c != nil { t.Fatalf("should be nil because the update should be batched") } c, err = state.CoordinateGetRaw("node2") if err != nil { t.Fatalf("err: %v", err) } if c != nil { t.Fatalf("should be nil because the update should be batched") } // Send another update for the second node. It should take precedence // since there will be two updates in the same batch. arg2.Coord = generateRandomCoordinate() if err := msgpackrpc.CallWithCodec(codec, "Coordinate.Update", &arg2, &out); err != nil { t.Fatalf("err: %v", err) } // Wait a while and the updates should get picked up. time.Sleep(2 * s1.config.CoordinateUpdatePeriod) c, err = state.CoordinateGetRaw("node1") if err != nil { t.Fatalf("err: %v", err) } if c == nil { t.Fatalf("should return a coordinate but it's nil") } verifyCoordinatesEqual(t, c, arg1.Coord) c, err = state.CoordinateGetRaw("node2") if err != nil { t.Fatalf("err: %v", err) } if c == nil { t.Fatalf("should return a coordinate but it's nil") } verifyCoordinatesEqual(t, c, arg2.Coord) // Register a bunch of additional nodes. spamLen := s1.config.CoordinateUpdateBatchSize*s1.config.CoordinateUpdateMaxBatches + 1 for i := 0; i < spamLen; i++ { req := structs.RegisterRequest{ Datacenter: "dc1", Node: fmt.Sprintf("bogusnode%d", i), Address: "127.0.0.1", } var reply struct{} if err := msgpackrpc.CallWithCodec(codec, "Catalog.Register", &req, &reply); err != nil { t.Fatalf("err: %v", err) } } // Now spam some coordinate updates and make sure it starts throwing // them away if they exceed the batch allowance. Note we have to make // unique names since these are held in map by node name. for i := 0; i < spamLen; i++ { arg1.Node = fmt.Sprintf("bogusnode%d", i) arg1.Coord = generateRandomCoordinate() if err := msgpackrpc.CallWithCodec(codec, "Coordinate.Update", &arg1, &out); err != nil { t.Fatalf("err: %v", err) } } // Wait a little while for the batch routine to run, then make sure // exactly one of the updates got dropped (we won't know which one). time.Sleep(2 * s1.config.CoordinateUpdatePeriod) numDropped := 0 for i := 0; i < spamLen; i++ { c, err = state.CoordinateGetRaw(fmt.Sprintf("bogusnode%d", i)) if err != nil { t.Fatalf("err: %v", err) } if c == nil { numDropped++ } } if numDropped != 1 { t.Fatalf("wrong number of coordinates dropped, %d != 1", numDropped) } // Finally, send a coordinate with the wrong dimensionality to make sure // there are no panics, and that it gets rejected. arg2.Coord.Vec = make([]float64, 2*len(arg2.Coord.Vec)) err = msgpackrpc.CallWithCodec(codec, "Coordinate.Update", &arg2, &out) if err == nil || !strings.Contains(err.Error(), "rejected bad coordinate") { t.Fatalf("should have failed with an error, got %v", err) } } func TestCoordinate_ListDatacenters(t *testing.T) { dir1, s1 := testServer(t) defer os.RemoveAll(dir1) defer s1.Shutdown() codec := rpcClient(t, s1) defer codec.Close() testutil.WaitForLeader(t, s1.RPC, "dc1") // It's super hard to force the Serfs into a known configuration of // coordinates, so the best we can do is make sure our own DC shows // up in the list with the proper coordinates. The guts of the algorithm // are extensively tested in rtt_test.go using a mock database. var out []structs.DatacenterMap if err := msgpackrpc.CallWithCodec(codec, "Coordinate.ListDatacenters", struct{}{}, &out); err != nil { t.Fatalf("err: %v", err) } if len(out) != 1 || out[0].Datacenter != "dc1" || len(out[0].Coordinates) != 1 || out[0].Coordinates[0].Node != s1.config.NodeName { t.Fatalf("bad: %v", out) } c, err := s1.serfWAN.GetCoordinate() if err != nil { t.Fatalf("bad: %v", err) } verifyCoordinatesEqual(t, c, out[0].Coordinates[0].Coord) } func TestCoordinate_ListNodes(t *testing.T) { dir1, s1 := testServer(t) defer os.RemoveAll(dir1) defer s1.Shutdown() codec := rpcClient(t, s1) defer codec.Close() testutil.WaitForLeader(t, s1.RPC, "dc1") // Register some nodes. nodes := []string{"foo", "bar", "baz"} for _, node := range nodes { req := structs.RegisterRequest{ Datacenter: "dc1", Node: node, Address: "127.0.0.1", } var reply struct{} if err := msgpackrpc.CallWithCodec(codec, "Catalog.Register", &req, &reply); err != nil { t.Fatalf("err: %v", err) } } // Send coordinate updates for a few nodes, waiting a little while for // the batch update to run. arg1 := structs.CoordinateUpdateRequest{ Datacenter: "dc1", Node: "foo", Coord: generateRandomCoordinate(), } var out struct{} if err := msgpackrpc.CallWithCodec(codec, "Coordinate.Update", &arg1, &out); err != nil { t.Fatalf("err: %v", err) } arg2 := structs.CoordinateUpdateRequest{ Datacenter: "dc1", Node: "bar", Coord: generateRandomCoordinate(), } if err := msgpackrpc.CallWithCodec(codec, "Coordinate.Update", &arg2, &out); err != nil { t.Fatalf("err: %v", err) } arg3 := structs.CoordinateUpdateRequest{ Datacenter: "dc1", Node: "baz", Coord: generateRandomCoordinate(), } if err := msgpackrpc.CallWithCodec(codec, "Coordinate.Update", &arg3, &out); err != nil { t.Fatalf("err: %v", err) } time.Sleep(2 * s1.config.CoordinateUpdatePeriod) // Now query back for all the nodes. arg := structs.DCSpecificRequest{ Datacenter: "dc1", } resp := structs.IndexedCoordinates{} if err := msgpackrpc.CallWithCodec(codec, "Coordinate.ListNodes", &arg, &resp); err != nil { t.Fatalf("err: %v", err) } if len(resp.Coordinates) != 3 || resp.Coordinates[0].Node != "bar" || resp.Coordinates[1].Node != "baz" || resp.Coordinates[2].Node != "foo" { t.Fatalf("bad: %v", resp.Coordinates) } verifyCoordinatesEqual(t, resp.Coordinates[0].Coord, arg2.Coord) // bar verifyCoordinatesEqual(t, resp.Coordinates[1].Coord, arg3.Coord) // baz verifyCoordinatesEqual(t, resp.Coordinates[2].Coord, arg1.Coord) // foo }