mirror of https://github.com/linkerd/linkerd2.git
142 lines
4.5 KiB
Go
142 lines
4.5 KiB
Go
package api
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import (
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"context"
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"errors"
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"net"
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"net/http"
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"testing"
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"github.com/golang/protobuf/proto"
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healthcheckPb "github.com/linkerd/linkerd2/controller/gen/common/healthcheck"
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vizClient "github.com/linkerd/linkerd2/viz/metrics-api/client"
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pb "github.com/linkerd/linkerd2/viz/metrics-api/gen/viz"
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)
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type mockServer struct {
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LastRequestReceived proto.Message
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ResponseToReturn proto.Message
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ErrorToReturn error
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}
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type mockGrpcServer struct {
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mockServer
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}
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func (m *mockGrpcServer) StatSummary(ctx context.Context, req *pb.StatSummaryRequest) (*pb.StatSummaryResponse, error) {
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m.LastRequestReceived = req
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return m.ResponseToReturn.(*pb.StatSummaryResponse), m.ErrorToReturn
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}
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func (m *mockGrpcServer) Gateways(ctx context.Context, req *pb.GatewaysRequest) (*pb.GatewaysResponse, error) {
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m.LastRequestReceived = req
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return m.ResponseToReturn.(*pb.GatewaysResponse), m.ErrorToReturn
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}
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func (m *mockGrpcServer) TopRoutes(ctx context.Context, req *pb.TopRoutesRequest) (*pb.TopRoutesResponse, error) {
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m.LastRequestReceived = req
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return m.ResponseToReturn.(*pb.TopRoutesResponse), m.ErrorToReturn
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}
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func (m *mockGrpcServer) Edges(ctx context.Context, req *pb.EdgesRequest) (*pb.EdgesResponse, error) {
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m.LastRequestReceived = req
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return m.ResponseToReturn.(*pb.EdgesResponse), m.ErrorToReturn
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}
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func (m *mockGrpcServer) ListPods(ctx context.Context, req *pb.ListPodsRequest) (*pb.ListPodsResponse, error) {
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m.LastRequestReceived = req
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return m.ResponseToReturn.(*pb.ListPodsResponse), m.ErrorToReturn
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}
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func (m *mockGrpcServer) ListServices(ctx context.Context, req *pb.ListServicesRequest) (*pb.ListServicesResponse, error) {
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m.LastRequestReceived = req
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return m.ResponseToReturn.(*pb.ListServicesResponse), m.ErrorToReturn
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}
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func (m *mockGrpcServer) SelfCheck(ctx context.Context, req *healthcheckPb.SelfCheckRequest) (*healthcheckPb.SelfCheckResponse, error) {
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m.LastRequestReceived = req
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return m.ResponseToReturn.(*healthcheckPb.SelfCheckResponse), m.ErrorToReturn
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}
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type grpcCallTestCase struct {
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expectedRequest proto.Message
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expectedResponse proto.Message
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functionCall func() (proto.Message, error)
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}
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func TestServer(t *testing.T) {
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t.Run("Delegates all non-streaming RPC messages to the underlying grpc server", func(t *testing.T) {
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mockGrpcServer, client := getServerVizClient(t)
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listPodsReq := &pb.ListPodsRequest{}
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testListPods := grpcCallTestCase{
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expectedRequest: listPodsReq,
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expectedResponse: &pb.ListPodsResponse{
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Pods: []*pb.Pod{
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{Status: "ok-ish"},
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},
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},
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functionCall: func() (proto.Message, error) { return client.ListPods(context.TODO(), listPodsReq) },
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}
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statSummaryReq := &pb.StatSummaryRequest{}
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testStatSummary := grpcCallTestCase{
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expectedRequest: statSummaryReq,
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expectedResponse: &pb.StatSummaryResponse{},
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functionCall: func() (proto.Message, error) { return client.StatSummary(context.TODO(), statSummaryReq) },
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}
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for _, testCase := range []grpcCallTestCase{testListPods, testStatSummary} {
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assertCallWasForwarded(t, &mockGrpcServer.mockServer, testCase.expectedRequest, testCase.expectedResponse, testCase.functionCall)
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}
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})
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}
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func getServerVizClient(t *testing.T) (*mockGrpcServer, pb.ApiClient) {
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mockGrpcServer := &mockGrpcServer{}
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listener, err := net.Listen("tcp", "localhost:0")
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if err != nil {
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t.Fatalf("Could not start listener: %v", err)
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}
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go func() {
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handler := &handler{
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grpcServer: mockGrpcServer,
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}
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err := http.Serve(listener, handler)
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if err != nil {
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t.Fatalf("Could not start server: %v", err)
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}
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}()
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client, err := vizClient.NewInternalClient("linkerd", listener.Addr().String())
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if err != nil {
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t.Fatalf("Unexpected error: %v", err)
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}
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return mockGrpcServer, client
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}
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func assertCallWasForwarded(t *testing.T, mockServer *mockServer, expectedRequest proto.Message, expectedResponse proto.Message, functionCall func() (proto.Message, error)) {
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mockServer.ErrorToReturn = nil
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mockServer.ResponseToReturn = expectedResponse
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actualResponse, err := functionCall()
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if err != nil {
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t.Fatalf("Unexpected error: %v", err)
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}
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actualRequest := mockServer.LastRequestReceived
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if !proto.Equal(actualRequest, expectedRequest) {
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t.Fatalf("Expecting server call to return [%v], but got [%v]", expectedRequest, actualRequest)
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}
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if !proto.Equal(actualResponse, expectedResponse) {
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t.Fatalf("Expecting server call to return [%v], but got [%v]", expectedResponse, actualResponse)
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}
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mockServer.ErrorToReturn = errors.New("expected")
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_, err = functionCall()
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if err == nil {
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t.Fatalf("Expecting error, got nothing")
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}
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}
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