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add grpc-proxy (github.com/mwitkow/grpc-proxy)

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Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>
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# gRPC Proxy
[![Travis Build](https://travis-ci.org/mwitkow/grpc-proxy.svg?branch=master)](https://travis-ci.org/mwitkow/grpc-proxy)
[![Go Report Card](https://goreportcard.com/badge/github.com/mwitkow/grpc-proxy)](https://goreportcard.com/report/github.com/mwitkow/grpc-proxy)
[![Go Reference](https://pkg.go.dev/badge/github.com/mwitkow/grpc-proxy.svg)](https://pkg.go.dev/github.com/mwitkow/grpc-proxy)
[![Apache 2.0 License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
[gRPC Go](https://github.com/grpc/grpc-go) Proxy server
## Project Goal
Build a transparent reverse proxy for gRPC targets that will make it easy to expose gRPC services
over the internet. This includes:
* no needed knowledge of the semantics of requests exchanged in the call (independent rollouts)
* easy, declarative definition of backends and their mappings to frontends
* simple round-robin load balancing of inbound requests from a single connection to multiple backends
The project now exists as a **proof of concept**, with the key piece being the `proxy` package that
is a generic gRPC reverse proxy handler.
## Proxy Handler
The package [`proxy`](proxy/) contains a generic gRPC reverse proxy handler that allows a gRPC server to
not know about registered handlers or their data types. Please consult the docs, here's an exaple usage.
You can call `proxy.NewProxy` to create a `*grpc.Server` that proxies requests.
```go
proxy := proxy.NewProxy(clientConn)
```
More advanced users will want to define a `StreamDirector` that can make more complex decisions on what
to do with the request.
```go
director = func(ctx context.Context, fullMethodName string) (context.Context, *grpc.ClientConn, error) {
md, _ := metadata.FromIncomingContext(ctx)
outCtx = metadata.NewOutgoingContext(ctx, md.Copy())
return outCtx, cc, nil
// Make sure we never forward internal services.
if strings.HasPrefix(fullMethodName, "/com.example.internal.") {
return outCtx, nil, status.Errorf(codes.Unimplemented, "Unknown method")
}
if ok {
// Decide on which backend to dial
if val, exists := md[":authority"]; exists && val[0] == "staging.api.example.com" {
// Make sure we use DialContext so the dialing can be cancelled/time out together with the context.
return outCtx, grpc.DialContext(ctx, "api-service.staging.svc.local", grpc.WithCodec(proxy.Codec())), nil
} else if val, exists := md[":authority"]; exists && val[0] == "api.example.com" {
return outCtx, grpc.DialContext(ctx, "api-service.prod.svc.local", grpc.WithCodec(proxy.Codec())), nil
}
}
return outCtx, nil, status.Errorf(codes.Unimplemented, "Unknown method")
}
```
Then you need to register it with a `grpc.Server`. The server may have other handlers that will be served
locally.
```go
server := grpc.NewServer(
grpc.CustomCodec(proxy.Codec()),
grpc.UnknownServiceHandler(proxy.TransparentHandler(director)))
pb_test.RegisterTestServiceServer(server, &testImpl{})
```
## Testing
To make debugging a bit simpler, there are some helpers.
`testservice` contains a method `TestTestServiceServerImpl` which performs a complete test against
the reference implementation of the `TestServiceServer`.
In `proxy_test.go`, the test framework spins up a `TestServiceServer` that it tests the proxy
against. To make debugging a bit simpler (eg. if the developer needs to step into
`google.golang.org/grpc` methods), this `TestServiceServer` can be provided by a server by
passing `-test-backend=addr` to `go test`. A simple, local-only implementation of
`TestServiceServer` exists in [`testservice/server`](./testservice/server).
## License
`grpc-proxy` is released under the Apache 2.0 license. See [LICENSE.txt](LICENSE.txt).

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package proxy
import (
"fmt"
"google.golang.org/grpc"
"google.golang.org/protobuf/proto"
)
// Codec returns a proxying grpc.Codec with the default protobuf codec as parent.
//
// See CodecWithParent.
//
// Deprecated: No longer necessary.
func Codec() grpc.Codec {
return CodecWithParent(&protoCodec{})
}
// CodecWithParent returns a proxying grpc.Codec with a user provided codec as parent.
//
// Deprecated: No longer necessary.
func CodecWithParent(fallback grpc.Codec) grpc.Codec {
return &rawCodec{fallback}
}
type rawCodec struct {
parentCodec grpc.Codec
}
type frame struct {
payload []byte
}
func (c *rawCodec) Marshal(v interface{}) ([]byte, error) {
out, ok := v.(*frame)
if !ok {
return c.parentCodec.Marshal(v)
}
return out.payload, nil
}
func (c *rawCodec) Unmarshal(data []byte, v interface{}) error {
dst, ok := v.(*frame)
if !ok {
return c.parentCodec.Unmarshal(data, v)
}
dst.payload = data
return nil
}
func (c *rawCodec) String() string {
return fmt.Sprintf("proxy>%s", c.parentCodec.String())
}
// protoCodec is a Codec implementation with protobuf. It is the default rawCodec for gRPC.
type protoCodec struct{}
func (protoCodec) Marshal(v interface{}) ([]byte, error) {
return proto.Marshal(v.(proto.Message))
}
func (protoCodec) Unmarshal(data []byte, v interface{}) error {
return proto.Unmarshal(data, v.(proto.Message))
}
func (protoCodec) String() string {
return "proto"
}

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package proxy
import (
"testing"
"github.com/stretchr/testify/require"
)
func TestCodec_ReadYourWrites(t *testing.T) {
framePtr := &frame{}
data := []byte{0xDE, 0xAD, 0xBE, 0xEF}
codec := rawCodec{}
require.NoError(t, codec.Unmarshal(data, framePtr), "unmarshalling must go ok")
out, err := codec.Marshal(framePtr)
require.NoError(t, err, "no marshal error")
require.Equal(t, data, out, "output and data must be the same")
// reuse
require.NoError(t, codec.Unmarshal([]byte{0x55}, framePtr), "unmarshalling must go ok")
out, err = codec.Marshal(framePtr)
require.NoError(t, err, "no marshal error")
require.Equal(t, []byte{0x55}, out, "output and data must be the same")
}

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// Copyright 2017 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package proxy
import (
"context"
"google.golang.org/grpc"
)
// StreamDirector returns a gRPC ClientConn to be used to forward the call to.
//
// The presence of the `Context` allows for rich filtering, e.g. based on Metadata (headers).
// If no handling is meant to be done, a `codes.NotImplemented` gRPC error should be returned.
//
// The context returned from this function should be the context for the *outgoing* (to backend) call. In case you want
// to forward any Metadata between the inbound request and outbound requests, you should do it manually. However, you
// *must* propagate the cancel function (`context.WithCancel`) of the inbound context to the one returned.
//
// It is worth noting that the StreamDirector will be fired *after* all server-side stream interceptors
// are invoked. So decisions around authorization, monitoring etc. are better to be handled there.
//
// See the rather rich example.
type StreamDirector func(ctx context.Context, fullMethodName string) (context.Context, grpc.ClientConnInterface, error)

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// Copyright 2017 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
/*
Package proxy provides a reverse proxy handler for gRPC.
The implementation allows a grpc.Server to pass a received ServerStream to a ClientStream without understanding
the semantics of the messages exchanged. It basically provides a transparent reverse-proxy.
This package is intentionally generic, exposing a StreamDirector function that allows users of this package
to implement whatever logic of backend-picking, dialing and service verification to perform.
See examples on documented functions.
*/
package proxy

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// Copyright 2017 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package proxy_test
import (
"context"
"log"
"strings"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
"go.linka.cloud/grpc-toolkit/proxy"
)
var (
director proxy.StreamDirector
)
func ExampleNewProxy() {
dst, err := grpc.Dial("example.com")
if err != nil {
log.Fatalf("dialing example.org: %v", err)
}
proxy := proxy.NewProxy(dst)
_ = proxy
}
func ExampleRegisterService() {
// A gRPC server with the proxying codec enabled.
server := grpc.NewServer()
// Register a TestService with 4 of its methods explicitly.
proxy.RegisterService(server, director,
"mwitkow.testproto.TestService",
"PingEmpty", "Ping", "PingError", "PingList")
}
func ExampleTransparentHandler() {
grpc.NewServer(
grpc.UnknownServiceHandler(proxy.TransparentHandler(director)))
}
// Provides a simple example of a director that shields internal services and dials a staging or production backend.
// This is a *very naive* implementation that creates a new connection on every request. Consider using pooling.
func ExampleStreamDirector() {
director = func(ctx context.Context, fullMethodName string) (context.Context, grpc.ClientConnInterface, error) {
// Make sure we never forward internal services.
if strings.HasPrefix(fullMethodName, "/com.example.internal.") {
return nil, nil, status.Errorf(codes.Unimplemented, "Unknown method")
}
md, ok := metadata.FromIncomingContext(ctx)
// Copy the inbound metadata explicitly.
outCtx := metadata.NewOutgoingContext(ctx, md.Copy())
if ok {
// Decide on which backend to dial
if val, exists := md[":authority"]; exists && val[0] == "staging.api.example.com" {
// Make sure we use DialContext so the dialing can be cancelled/time out together with the context.
conn, err := grpc.DialContext(ctx, "api-service.staging.svc.local")
return outCtx, conn, err
} else if val, exists := md[":authority"]; exists && val[0] == "api.example.com" {
conn, err := grpc.DialContext(ctx, "api-service.prod.svc.local")
return outCtx, conn, err
}
}
return nil, nil, status.Errorf(codes.Unimplemented, "Unknown method")
}
}

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// Copyright 2017 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package proxy
import (
"context"
"io"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/types/known/emptypb"
)
var (
clientStreamDescForProxying = &grpc.StreamDesc{
ServerStreams: true,
ClientStreams: true,
}
)
// RegisterService sets up a proxy handler for a particular gRPC service and method.
// The behaviour is the same as if you were registering a handler method, e.g. from a generated pb.go file.
func RegisterService(server *grpc.Server, director StreamDirector, serviceName string, methodNames ...string) {
streamer := &handler{director}
fakeDesc := &grpc.ServiceDesc{
ServiceName: serviceName,
HandlerType: (*interface{})(nil),
}
for _, m := range methodNames {
streamDesc := grpc.StreamDesc{
StreamName: m,
Handler: streamer.handler,
ServerStreams: true,
ClientStreams: true,
}
fakeDesc.Streams = append(fakeDesc.Streams, streamDesc)
}
server.RegisterService(fakeDesc, streamer)
}
// TransparentHandler returns a handler that attempts to proxy all requests that are not registered in the server.
// The indented use here is as a transparent proxy, where the server doesn't know about the services implemented by the
// backends. It should be used as a `grpc.UnknownServiceHandler`.
func TransparentHandler(director StreamDirector) grpc.StreamHandler {
streamer := &handler{director: director}
return streamer.handler
}
type handler struct {
director StreamDirector
}
// handler is where the real magic of proxying happens.
// It is invoked like any gRPC server stream and uses the emptypb.Empty type server
// to proxy calls between the input and output streams.
func (s *handler) handler(srv interface{}, serverStream grpc.ServerStream) error {
// little bit of gRPC internals never hurt anyone
fullMethodName, ok := grpc.MethodFromServerStream(serverStream)
if !ok {
return status.Errorf(codes.Internal, "lowLevelServerStream not exists in context")
}
// We require that the director's returned context inherits from the serverStream.Context().
outgoingCtx, backendConn, err := s.director(serverStream.Context(), fullMethodName)
if err != nil {
return err
}
clientCtx, clientCancel := context.WithCancel(outgoingCtx)
defer clientCancel()
// TODO(mwitkow): Add a `forwarded` header to metadata, https://en.wikipedia.org/wiki/X-Forwarded-For.
clientStream, err := backendConn.NewStream(clientCtx, clientStreamDescForProxying, fullMethodName)
if err != nil {
return err
}
// Explicitly *do not close* s2cErrChan and c2sErrChan, otherwise the select below will not terminate.
// Channels do not have to be closed, it is just a control flow mechanism, see
// https://groups.google.com/forum/#!msg/golang-nuts/pZwdYRGxCIk/qpbHxRRPJdUJ
s2cErrChan := s.forwardServerToClient(serverStream, clientStream)
c2sErrChan := s.forwardClientToServer(clientStream, serverStream)
// We don't know which side is going to stop sending first, so we need a select between the two.
for i := 0; i < 2; i++ {
select {
case s2cErr := <-s2cErrChan:
if s2cErr == io.EOF {
// this is the happy case where the sender has encountered io.EOF, and won't be sending anymore./
// the clientStream>serverStream may continue pumping though.
clientStream.CloseSend()
} else {
// however, we may have gotten a receive error (stream disconnected, a read error etc) in which case we need
// to cancel the clientStream to the backend, let all of its goroutines be freed up by the CancelFunc and
// exit with an error to the stack
clientCancel()
return status.Errorf(codes.Internal, "failed proxying s2c: %v", s2cErr)
}
case c2sErr := <-c2sErrChan:
// This happens when the clientStream has nothing else to offer (io.EOF), returned a gRPC error. In those two
// cases we may have received Trailers as part of the call. In case of other errors (stream closed) the trailers
// will be nil.
serverStream.SetTrailer(clientStream.Trailer())
// c2sErr will contain RPC error from client code. If not io.EOF return the RPC error as server stream error.
if c2sErr != io.EOF {
return c2sErr
}
return nil
}
}
return status.Errorf(codes.Internal, "gRPC proxying should never reach this stage.")
}
func (s *handler) forwardClientToServer(src grpc.ClientStream, dst grpc.ServerStream) chan error {
ret := make(chan error, 1)
go func() {
f := &emptypb.Empty{}
for i := 0; ; i++ {
if err := src.RecvMsg(f); err != nil {
ret <- err // this can be io.EOF which is happy case
break
}
if i == 0 {
// This is a bit of a hack, but client to server headers are only readable after first client msg is
// received but must be written to server stream before the first msg is flushed.
// This is the only place to do it nicely.
md, err := src.Header()
if err != nil {
ret <- err
break
}
if err := dst.SendHeader(md); err != nil {
ret <- err
break
}
}
if err := dst.SendMsg(f); err != nil {
ret <- err
break
}
}
}()
return ret
}
func (s *handler) forwardServerToClient(src grpc.ServerStream, dst grpc.ClientStream) chan error {
ret := make(chan error, 1)
go func() {
f := &emptypb.Empty{}
for i := 0; ; i++ {
if err := src.RecvMsg(f); err != nil {
ret <- err // this can be io.EOF which is happy case
break
}
if err := dst.SendMsg(f); err != nil {
ret <- err
break
}
}
}()
return ret
}

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// Copyright 2017 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package proxy_test
import (
"context"
"fmt"
"io"
"net"
"strings"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/stretchr/testify/suite"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/emptypb"
"go.linka.cloud/grpc-toolkit/proxy"
pb "go.linka.cloud/grpc-toolkit/proxy/testservice"
)
const (
pingDefaultValue = "I like kittens."
clientMdKey = "test-client-header"
serverHeaderMdKey = "test-client-header"
serverTrailerMdKey = "test-client-trailer"
rejectingMdKey = "test-reject-rpc-if-in-context"
countListResponses = 20
)
// asserting service is implemented on the server side and serves as a handler for stuff
type assertingService struct {
t *testing.T
pb.UnsafeTestServiceServer
}
var _ pb.TestServiceServer = (*assertingService)(nil)
func (s *assertingService) PingEmpty(ctx context.Context, _ *emptypb.Empty) (*pb.PingResponse, error) {
// Check that this call has client's metadata.
md, ok := metadata.FromIncomingContext(ctx)
assert.True(s.t, ok, "PingEmpty call must have metadata in context")
_, ok = md[clientMdKey]
assert.True(s.t, ok, "PingEmpty call must have clients's custom headers in metadata")
return &pb.PingResponse{Value: pingDefaultValue, Counter: 42}, nil
}
func (s *assertingService) Ping(ctx context.Context, ping *pb.PingRequest) (*pb.PingResponse, error) {
// Send user trailers and headers.
grpc.SendHeader(ctx, metadata.Pairs(serverHeaderMdKey, "I like turtles."))
grpc.SetTrailer(ctx, metadata.Pairs(serverTrailerMdKey, "I like ending turtles."))
return &pb.PingResponse{Value: ping.Value, Counter: 42}, nil
}
func (s *assertingService) PingError(ctx context.Context, ping *pb.PingRequest) (*emptypb.Empty, error) {
return nil, status.Errorf(codes.FailedPrecondition, "Userspace error.")
}
func (s *assertingService) PingList(ping *pb.PingRequest, stream pb.TestService_PingListServer) error {
// Send user trailers and headers.
stream.SendHeader(metadata.Pairs(serverHeaderMdKey, "I like turtles."))
for i := 0; i < countListResponses; i++ {
stream.Send(&pb.PingResponse{Value: ping.Value, Counter: int32(i)})
}
stream.SetTrailer(metadata.Pairs(serverTrailerMdKey, "I like ending turtles."))
return nil
}
func (s *assertingService) PingStream(stream pb.TestService_PingStreamServer) error {
stream.SendHeader(metadata.Pairs(serverHeaderMdKey, "I like turtles."))
counter := int32(0)
for {
ping, err := stream.Recv()
if err == io.EOF {
break
} else if err != nil {
require.NoError(s.t, err, "can't fail reading stream")
return err
}
pong := &pb.PingResponse{Value: ping.Value, Counter: counter}
if err := stream.Send(pong); err != nil {
require.NoError(s.t, err, "can't fail sending back a pong")
}
counter += 1
}
stream.SetTrailer(metadata.Pairs(serverTrailerMdKey, "I like ending turtles."))
return nil
}
// ProxyHappySuite tests the "happy" path of handling: that everything works in absence of connection issues.
type ProxyHappySuite struct {
suite.Suite
serverListener net.Listener
server *grpc.Server
proxyListener net.Listener
proxy *grpc.Server
serverClientConn *grpc.ClientConn
client *grpc.ClientConn
testClient pb.TestServiceClient
}
func (s *ProxyHappySuite) TestPingEmptyCarriesClientMetadata() {
ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(clientMdKey, "true"))
out, err := s.testClient.PingEmpty(ctx, &emptypb.Empty{})
require.NoError(s.T(), err, "PingEmpty should succeed without errors")
want := &pb.PingResponse{Value: pingDefaultValue, Counter: 42}
require.True(s.T(), proto.Equal(want, out))
}
func (s *ProxyHappySuite) TestPingEmpty_StressTest() {
for i := 0; i < 50; i++ {
s.TestPingEmptyCarriesClientMetadata()
}
}
func (s *ProxyHappySuite) TestPingCarriesServerHeadersAndTrailers() {
headerMd := make(metadata.MD)
trailerMd := make(metadata.MD)
// This is an awkward calling convention... but meh.
out, err := s.testClient.Ping(context.Background(), &pb.PingRequest{Value: "foo"}, grpc.Header(&headerMd), grpc.Trailer(&trailerMd))
want := &pb.PingResponse{Value: "foo", Counter: 42}
require.NoError(s.T(), err, "Ping should succeed without errors")
require.True(s.T(), proto.Equal(want, out))
assert.Contains(s.T(), headerMd, serverHeaderMdKey, "server response headers must contain server data")
assert.Len(s.T(), trailerMd, 1, "server response trailers must contain server data")
}
func (s *ProxyHappySuite) TestPingErrorPropagatesAppError() {
_, err := s.testClient.PingError(context.Background(), &pb.PingRequest{Value: "foo"})
require.Error(s.T(), err, "PingError should never succeed")
assert.Equal(s.T(), codes.FailedPrecondition, status.Code(err))
assert.Equal(s.T(), "Userspace error.", status.Convert(err).Message())
}
func (s *ProxyHappySuite) TestDirectorErrorIsPropagated() {
// See SetupSuite where the StreamDirector has a special case.
ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(rejectingMdKey, "true"))
_, err := s.testClient.Ping(ctx, &pb.PingRequest{Value: "foo"})
require.Error(s.T(), err, "Director should reject this RPC")
assert.Equal(s.T(), codes.PermissionDenied, status.Code(err))
assert.Equal(s.T(), "testing rejection", status.Convert(err).Message())
}
func (s *ProxyHappySuite) TestPingStream_FullDuplexWorks() {
stream, err := s.testClient.PingStream(context.Background())
require.NoError(s.T(), err, "PingStream request should be successful.")
for i := 0; i < countListResponses; i++ {
ping := &pb.PingRequest{Value: fmt.Sprintf("foo:%d", i)}
require.NoError(s.T(), stream.Send(ping), "sending to PingStream must not fail")
resp, err := stream.Recv()
if err == io.EOF {
break
}
if i == 0 {
// Check that the header arrives before all entries.
headerMd, err := stream.Header()
require.NoError(s.T(), err, "PingStream headers should not error.")
assert.Contains(s.T(), headerMd, serverHeaderMdKey, "PingStream response headers user contain metadata")
}
assert.EqualValues(s.T(), i, resp.Counter, "ping roundtrip must succeed with the correct id")
}
require.NoError(s.T(), stream.CloseSend(), "no error on close send")
_, err = stream.Recv()
require.Equal(s.T(), io.EOF, err, "stream should close with io.EOF, meaining OK")
// Check that the trailer headers are here.
trailerMd := stream.Trailer()
assert.Len(s.T(), trailerMd, 1, "PingList trailer headers user contain metadata")
}
func (s *ProxyHappySuite) TestPingStream_StressTest() {
for i := 0; i < 50; i++ {
s.TestPingStream_FullDuplexWorks()
}
}
func (s *ProxyHappySuite) SetupSuite() {
var err error
s.proxyListener, err = net.Listen("tcp", "127.0.0.1:0")
require.NoError(s.T(), err, "must be able to allocate a port for proxyListener")
s.serverListener, err = net.Listen("tcp", "127.0.0.1:0")
require.NoError(s.T(), err, "must be able to allocate a port for serverListener")
s.server = grpc.NewServer()
pb.RegisterTestServiceServer(s.server, &assertingService{t: s.T()})
// Setup of the proxy's Director.
//lint:ignore SA1019 regression test
s.serverClientConn, err = grpc.Dial(s.serverListener.Addr().String(), grpc.WithInsecure(), grpc.WithCodec(proxy.Codec()))
require.NoError(s.T(), err, "must not error on deferred client Dial")
director := func(ctx context.Context, fullName string) (context.Context, grpc.ClientConnInterface, error) {
md, ok := metadata.FromIncomingContext(ctx)
if ok {
if _, exists := md[rejectingMdKey]; exists {
return ctx, nil, status.Errorf(codes.PermissionDenied, "testing rejection")
}
}
// Explicitly copy the metadata, otherwise the tests will fail.
outCtx := metadata.NewOutgoingContext(ctx, md.Copy())
return outCtx, s.serverClientConn, nil
}
s.proxy = grpc.NewServer(
//lint:ignore SA1019 regression test
grpc.CustomCodec(proxy.Codec()),
grpc.UnknownServiceHandler(proxy.TransparentHandler(director)),
)
// Ping handler is handled as an explicit registration and not as a TransparentHandler.
proxy.RegisterService(s.proxy, director,
"mwitkow.testproto.TestService",
"Ping")
// Start the serving loops.
s.T().Logf("starting grpc.Server at: %v", s.serverListener.Addr().String())
go func() {
s.server.Serve(s.serverListener)
}()
s.T().Logf("starting grpc.Proxy at: %v", s.proxyListener.Addr().String())
go func() {
s.proxy.Serve(s.proxyListener)
}()
dCtx, ccl := context.WithTimeout(context.Background(), time.Second)
defer ccl()
clientConn, err := grpc.DialContext(dCtx, strings.Replace(s.proxyListener.Addr().String(), "127.0.0.1", "localhost", 1), grpc.WithInsecure())
require.NoError(s.T(), err, "must not error on deferred client Dial")
s.testClient = pb.NewTestServiceClient(clientConn)
}
func (s *ProxyHappySuite) TearDownSuite() {
if s.client != nil {
s.client.Close()
}
if s.serverClientConn != nil {
s.serverClientConn.Close()
}
// Close all transports so the logs don't get spammy.
time.Sleep(10 * time.Millisecond)
if s.proxy != nil {
s.proxy.Stop()
s.proxyListener.Close()
}
if s.serverListener != nil {
s.server.Stop()
s.serverListener.Close()
}
}
func TestProxyHappySuite(t *testing.T) {
suite.Run(t, &ProxyHappySuite{})
}

33
proxy/proxy.go Normal file
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// Copyright 2021 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package proxy
import (
"context"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
// NewProxy sets up a simple proxy that forwards all requests to dst.
func NewProxy(dst *grpc.ClientConn, opts ...grpc.ServerOption) *grpc.Server {
opts = append(opts, DefaultProxyOpt(dst))
// Set up the proxy server and then serve from it like in step one.
return grpc.NewServer(opts...)
}
// DefaultProxyOpt returns an grpc.UnknownServiceHandler with a DefaultDirector.
func DefaultProxyOpt(cc *grpc.ClientConn) grpc.ServerOption {
return grpc.UnknownServiceHandler(TransparentHandler(DefaultDirector(cc)))
}
// DefaultDirector returns a very simple forwarding StreamDirector that forwards all
// calls.
func DefaultDirector(cc *grpc.ClientConn) StreamDirector {
return func(ctx context.Context, fullMethodName string) (context.Context, grpc.ClientConnInterface, error) {
md, _ := metadata.FromIncomingContext(ctx)
ctx = metadata.NewOutgoingContext(ctx, md.Copy())
return ctx, cc, nil
}
}

211
proxy/proxy_test.go Normal file
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package proxy_test
import (
"context"
"flag"
"fmt"
"net"
"testing"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/test/bufconn"
"go.linka.cloud/grpc-toolkit/proxy"
"go.linka.cloud/grpc-toolkit/proxy/testservice"
)
var testBackend = flag.String("test-backend", "", "Service providing TestServiceServer")
// TestIntegrationV1 is a regression test of the proxy.
func TestLegacyBehaviour(t *testing.T) {
// These bufconns are test listeners used to make connections between our
// services. This test actually starts two fully functional grpc services.
proxyBc := bufconn.Listen(10)
// Setup is a little thorough, but here's the gist of it:
// 1. Create the test backend using testservice.DefaultTestServiceServer
// 2. Create the proxy backend using this package
// 3. Make calls to 1 via 2.
// 1.
//lint:ignore SA1019 regression test
testCC, err := backendDialer(t, grpc.WithCodec(proxy.Codec()))
if err != nil {
t.Fatal(err)
}
// 2.
go func() {
// Second, we need to implement the SteamDirector.
directorFn := func(ctx context.Context, fullMethodName string) (context.Context, grpc.ClientConnInterface, error) {
md, _ := metadata.FromIncomingContext(ctx)
outCtx := metadata.NewOutgoingContext(ctx, md.Copy())
return outCtx, testCC, nil
}
// Set up the proxy server and then serve from it like in step one.
proxySrv := grpc.NewServer(
//lint:ignore SA1019 regression test
grpc.CustomCodec(proxy.Codec()), // was previously needed for proxy to function.
grpc.UnknownServiceHandler(proxy.TransparentHandler(directorFn)),
)
// run the proxy backend
go func() {
t.Log("Running proxySrv")
if err := proxySrv.Serve(proxyBc); err != nil {
if err == grpc.ErrServerStopped {
return
}
t.Logf("running proxy server: %v", err)
}
}()
t.Cleanup(func() {
t.Log("Gracefully stopping proxySrv")
proxySrv.GracefulStop()
})
}()
// 3.
// Connect to the proxy. We should not need to do anything special here -
// users do not need to know they're talking to a proxy.
proxyCC, err := grpc.Dial(
"bufnet",
grpc.WithInsecure(),
grpc.WithBlock(),
grpc.WithContextDialer(func(ctx context.Context, s string) (net.Conn, error) {
return proxyBc.Dial()
}),
)
if err != nil {
t.Fatalf("dialing proxy: %v", err)
}
proxyClient := testservice.NewTestServiceClient(proxyCC)
// 4. Run the tests!
testservice.TestTestServiceServerImpl(t, proxyClient)
}
func TestNewProxy(t *testing.T) {
proxyBc := bufconn.Listen(10)
// Setup is a little thorough, but here's the gist of it:
// 1. Create the test backend using testservice.DefaultTestServiceServer
// 2. Create the proxy backend using this package
// 3. Make calls to 1 via 2.
// 1.
// First, we need to create a client connection to this backend.
testCC, err := backendDialer(t)
if err != nil {
t.Fatal(err)
}
// 2.
go func() {
t.Helper()
// First, we need to create a client connection to this backend.
proxySrv := proxy.NewProxy(testCC)
// run the proxy backend
go func() {
t.Log("Running proxySrv")
if err := proxySrv.Serve(proxyBc); err != nil {
if err == grpc.ErrServerStopped {
return
}
t.Logf("running proxy server: %v", err)
}
}()
t.Cleanup(func() {
t.Log("Gracefully stopping proxySrv")
proxySrv.GracefulStop()
})
}()
// 3.
// Connect to the proxy. We should not need to do anything special here -
// users do not need to know they're talking to a proxy.
t.Logf("dialing %s", proxyBc.Addr())
proxyCC, err := grpc.Dial(
proxyBc.Addr().String(),
grpc.WithInsecure(),
grpc.WithBlock(),
grpc.WithContextDialer(func(ctx context.Context, s string) (net.Conn, error) {
return proxyBc.Dial()
}),
)
if err != nil {
t.Fatalf("dialing proxy: %v", err)
}
proxyClient := testservice.NewTestServiceClient(proxyCC)
// 4. Run the tests!
testservice.TestTestServiceServerImpl(t, proxyClient)
}
// backendDialer dials the testservice.TestServiceServer either by connecting
// to the user-supplied server, or by creating a mock server using bufconn.
func backendDialer(t *testing.T, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
t.Helper()
if *testBackend != "" {
return backendSvcDialer(t, *testBackend, opts...)
}
backendBc := bufconn.Listen(10)
// set up the backend using a "real" server over a bufconn
testSrv := grpc.NewServer()
testservice.RegisterTestServiceServer(testSrv, testservice.DefaultTestServiceServer)
// run the test backend
go func() {
t.Log("Running testSrv")
if err := testSrv.Serve(backendBc); err != nil {
if err == grpc.ErrServerStopped {
return
}
t.Logf("running test server: %v", err)
}
}()
t.Cleanup(func() {
t.Log("Gracefully stopping testSrv")
testSrv.GracefulStop()
})
opts = append(opts,
grpc.WithInsecure(),
grpc.WithBlock(),
grpc.WithContextDialer(func(ctx context.Context, s string) (net.Conn, error) {
return backendBc.Dial()
}),
)
backendCC, err := grpc.Dial(
"bufnet",
opts...,
)
if err != nil {
return nil, fmt.Errorf("dialing backend: %v", err)
}
return backendCC, nil
}
func backendSvcDialer(t *testing.T, addr string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
opts = append(opts,
grpc.WithInsecure(),
grpc.WithBlock(),
)
t.Logf("connecting to %s", addr)
cc, err := grpc.Dial(
addr,
opts...,
)
if err != nil {
return nil, fmt.Errorf("dialing backend: %v", err)
}
return cc, nil
}

9
proxy/testservice/Makefile Normal file
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@ -0,0 +1,9 @@
all: test_go
test_go: test.proto
protoc --go_out=. --go_opt=paths=source_relative \
--go-grpc_out=. --go-grpc_opt=paths=source_relative \
test.proto

168
proxy/testservice/ping.go Normal file
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@ -0,0 +1,168 @@
package testservice
import (
"context"
"fmt"
"io"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/types/known/emptypb"
)
var DefaultTestServiceServer = defaultPingServer{}
const (
PingHeader = "ping-header"
PingHeaderCts = "Arbitrary header text"
PingTrailer = "ping-trailer"
PingTrailerCts = "Arbitrary trailer text"
PingEchoHeader = "ping-echo-header"
PingEchoTrailer = "ping-echo-trailer"
)
// defaultPingServer is the canonical implementation of a TestServiceServer.
type defaultPingServer struct {
UnsafeTestServiceServer
}
func (s defaultPingServer) PingEmpty(ctx context.Context, empty *emptypb.Empty) (*PingResponse, error) {
if err := s.sendHeader(ctx); err != nil {
return nil, err
}
if err := s.setTrailer(ctx); err != nil {
return nil, err
}
return &PingResponse{}, nil
}
func (s defaultPingServer) Ping(ctx context.Context, request *PingRequest) (*PingResponse, error) {
if err := s.sendHeader(ctx); err != nil {
return nil, err
}
if err := s.setTrailer(ctx); err != nil {
return nil, err
}
return &PingResponse{Value: request.Value}, nil
}
func (s defaultPingServer) PingError(ctx context.Context, request *PingRequest) (*emptypb.Empty, error) {
if err := s.sendHeader(ctx); err != nil {
return nil, err
}
if err := s.setTrailer(ctx); err != nil {
return nil, err
}
return nil, status.Error(codes.Unknown, "Something is wrong and this is a message that describes it")
}
func (s defaultPingServer) PingList(request *PingRequest, server TestService_PingListServer) error {
if err := s.sendHeader(server.Context()); err != nil {
return err
}
s.setStreamTrailer(server)
for i := 0; i < 10; i++ {
if err := server.Send(&PingResponse{
Value: request.Value,
Counter: int32(i),
}); err != nil {
return err
}
}
return nil
}
func (s defaultPingServer) PingStream(server TestService_PingStreamServer) error {
g, ctx := errgroup.WithContext(context.Background())
if err := s.sendHeader(server.Context()); err != nil {
return err
}
pings := make(chan *PingRequest)
g.Go(func() error {
defer close(pings)
for {
m, err := server.Recv()
if err != nil {
if err == io.EOF {
return nil
}
return err
}
select {
case pings <- m:
case <-ctx.Done():
return ctx.Err()
}
}
})
g.Go(func() error {
var i int32
for m := range pings {
if err := server.Send(&PingResponse{
Value: m.Value,
Counter: i,
}); err != nil {
return err
}
i++
}
return nil
})
return g.Wait()
}
func (s *defaultPingServer) sendHeader(ctx context.Context) error {
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
md = metadata.New(nil)
}
if tvs := md.Get(PingEchoHeader); len(tvs) > 0 {
md.Append(PingEchoHeader, tvs...)
}
md.Append(PingHeader, PingHeaderCts)
if err := grpc.SendHeader(ctx, md); err != nil {
return fmt.Errorf("setting header: %w", err)
}
return nil
}
func (s *defaultPingServer) setTrailer(ctx context.Context) error {
md := s.buildTrailer(ctx)
if err := grpc.SetTrailer(ctx, md); err != nil {
return fmt.Errorf("setting trailer: %w", err)
}
return nil
}
func (s *defaultPingServer) buildTrailer(ctx context.Context) metadata.MD {
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
md = metadata.New(nil)
}
if tvs := md.Get(PingEchoTrailer); len(tvs) > 0 {
md.Append(PingEchoTrailer, tvs...)
}
md.Append(PingTrailer, PingTrailerCts)
return md
}
func (s defaultPingServer) setStreamTrailer(server grpc.ServerStream) {
server.SetTrailer(s.buildTrailer(server.Context()))
}
var _ TestServiceServer = (*defaultPingServer)(nil)

54
proxy/testservice/server/main.go Normal file
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@ -0,0 +1,54 @@
package main
import (
"flag"
"fmt"
"log"
"net"
"os"
"os/signal"
"syscall"
"google.golang.org/grpc"
"go.linka.cloud/grpc-toolkit/proxy/testservice"
)
var (
port = flag.Uint("port", 8080, "Port to listen to")
)
func main() {
srv := grpc.NewServer()
lis, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", *port))
if err != nil {
panic(err)
}
testservice.RegisterTestServiceServer(srv, testservice.DefaultTestServiceServer)
errs := make(chan error)
go func() {
log.Printf("listening on %s", lis.Addr().String())
errs <- srv.Serve(lis)
}()
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
go func() {
sig := <-sigs
log.Printf("shutdown due to %s", sig)
srv.GracefulStop()
}()
if err := <-errs; err != nil {
log.Println(err)
os.Exit(1)
}
os.Exit(0)
}
func init() {
flag.Parse()
}

255
proxy/testservice/test.pb.go Normal file
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@ -0,0 +1,255 @@
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.25.0-devel
// protoc v3.15.5
// source: test.proto
package testservice
import (
protoreflect "google.golang.org/protobuf/reflect/protoreflect"
protoimpl "google.golang.org/protobuf/runtime/protoimpl"
emptypb "google.golang.org/protobuf/types/known/emptypb"
reflect "reflect"
sync "sync"
)
const (
// Verify that this generated code is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
// Verify that runtime/protoimpl is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
)
type PingRequest struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Value string `protobuf:"bytes,1,opt,name=value,proto3" json:"value,omitempty"`
}
func (x *PingRequest) Reset() {
*x = PingRequest{}
if protoimpl.UnsafeEnabled {
mi := &file_test_proto_msgTypes[0]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *PingRequest) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*PingRequest) ProtoMessage() {}
func (x *PingRequest) ProtoReflect() protoreflect.Message {
mi := &file_test_proto_msgTypes[0]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
// Deprecated: Use PingRequest.ProtoReflect.Descriptor instead.
func (*PingRequest) Descriptor() ([]byte, []int) {
return file_test_proto_rawDescGZIP(), []int{0}
}
func (x *PingRequest) GetValue() string {
if x != nil {
return x.Value
}
return ""
}
type PingResponse struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Value string `protobuf:"bytes,1,opt,name=value,proto3" json:"value,omitempty"`
Counter int32 `protobuf:"varint,2,opt,name=counter,proto3" json:"counter,omitempty"`
}
func (x *PingResponse) Reset() {
*x = PingResponse{}
if protoimpl.UnsafeEnabled {
mi := &file_test_proto_msgTypes[1]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *PingResponse) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*PingResponse) ProtoMessage() {}
func (x *PingResponse) ProtoReflect() protoreflect.Message {
mi := &file_test_proto_msgTypes[1]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
// Deprecated: Use PingResponse.ProtoReflect.Descriptor instead.
func (*PingResponse) Descriptor() ([]byte, []int) {
return file_test_proto_rawDescGZIP(), []int{1}
}
func (x *PingResponse) GetValue() string {
if x != nil {
return x.Value
}
return ""
}
func (x *PingResponse) GetCounter() int32 {
if x != nil {
return x.Counter
}
return 0
}
var File_test_proto protoreflect.FileDescriptor
var file_test_proto_rawDesc = []byte{
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0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
}
var (
file_test_proto_rawDescOnce sync.Once
file_test_proto_rawDescData = file_test_proto_rawDesc
)
func file_test_proto_rawDescGZIP() []byte {
file_test_proto_rawDescOnce.Do(func() {
file_test_proto_rawDescData = protoimpl.X.CompressGZIP(file_test_proto_rawDescData)
})
return file_test_proto_rawDescData
}
var file_test_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
var file_test_proto_goTypes = []interface{}{
(*PingRequest)(nil), // 0: mwitkow.testproto.PingRequest
(*PingResponse)(nil), // 1: mwitkow.testproto.PingResponse
(*emptypb.Empty)(nil), // 2: google.protobuf.Empty
}
var file_test_proto_depIdxs = []int32{
2, // 0: mwitkow.testproto.TestService.PingEmpty:input_type -> google.protobuf.Empty
0, // 1: mwitkow.testproto.TestService.Ping:input_type -> mwitkow.testproto.PingRequest
0, // 2: mwitkow.testproto.TestService.PingError:input_type -> mwitkow.testproto.PingRequest
0, // 3: mwitkow.testproto.TestService.PingList:input_type -> mwitkow.testproto.PingRequest
0, // 4: mwitkow.testproto.TestService.PingStream:input_type -> mwitkow.testproto.PingRequest
1, // 5: mwitkow.testproto.TestService.PingEmpty:output_type -> mwitkow.testproto.PingResponse
1, // 6: mwitkow.testproto.TestService.Ping:output_type -> mwitkow.testproto.PingResponse
2, // 7: mwitkow.testproto.TestService.PingError:output_type -> google.protobuf.Empty
1, // 8: mwitkow.testproto.TestService.PingList:output_type -> mwitkow.testproto.PingResponse
1, // 9: mwitkow.testproto.TestService.PingStream:output_type -> mwitkow.testproto.PingResponse
5, // [5:10] is the sub-list for method output_type
0, // [0:5] is the sub-list for method input_type
0, // [0:0] is the sub-list for extension type_name
0, // [0:0] is the sub-list for extension extendee
0, // [0:0] is the sub-list for field type_name
}
func init() { file_test_proto_init() }
func file_test_proto_init() {
if File_test_proto != nil {
return
}
if !protoimpl.UnsafeEnabled {
file_test_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*PingRequest); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
file_test_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*PingResponse); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
}
type x struct{}
out := protoimpl.TypeBuilder{
File: protoimpl.DescBuilder{
GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
RawDescriptor: file_test_proto_rawDesc,
NumEnums: 0,
NumMessages: 2,
NumExtensions: 0,
NumServices: 1,
},
GoTypes: file_test_proto_goTypes,
DependencyIndexes: file_test_proto_depIdxs,
MessageInfos: file_test_proto_msgTypes,
}.Build()
File_test_proto = out.File
file_test_proto_rawDesc = nil
file_test_proto_goTypes = nil
file_test_proto_depIdxs = nil
}

30
proxy/testservice/test.proto Normal file
View File

@ -0,0 +1,30 @@
syntax = "proto3";
package mwitkow.testproto;
option go_package="go.linka.cloud/grpc-toolkit/proxy/testservice";
import "google/protobuf/empty.proto";
message PingRequest {
string value = 1;
}
message PingResponse {
string value = 1;
int32 counter = 2;
}
service TestService {
rpc PingEmpty(google.protobuf.Empty) returns (PingResponse) {}
rpc Ping(PingRequest) returns (PingResponse) {}
rpc PingError(PingRequest) returns (google.protobuf.Empty) {}
rpc PingList(PingRequest) returns (stream PingResponse) {}
rpc PingStream(stream PingRequest) returns (stream PingResponse) {}
}

306
proxy/testservice/test_grpc.pb.go Normal file
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@ -0,0 +1,306 @@
// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
package testservice
import (
context "context"
grpc "google.golang.org/grpc"
codes "google.golang.org/grpc/codes"
status "google.golang.org/grpc/status"
emptypb "google.golang.org/protobuf/types/known/emptypb"
)
// This is a compile-time assertion to ensure that this generated file
// is compatible with the grpc package it is being compiled against.
// Requires gRPC-Go v1.32.0 or later.
const _ = grpc.SupportPackageIsVersion7
// TestServiceClient is the client API for TestService service.
//
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
type TestServiceClient interface {
PingEmpty(ctx context.Context, in *emptypb.Empty, opts ...grpc.CallOption) (*PingResponse, error)
Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error)
PingError(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*emptypb.Empty, error)
PingList(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (TestService_PingListClient, error)
PingStream(ctx context.Context, opts ...grpc.CallOption) (TestService_PingStreamClient, error)
}
type testServiceClient struct {
cc grpc.ClientConnInterface
}
func NewTestServiceClient(cc grpc.ClientConnInterface) TestServiceClient {
return &testServiceClient{cc}
}
func (c *testServiceClient) PingEmpty(ctx context.Context, in *emptypb.Empty, opts ...grpc.CallOption) (*PingResponse, error) {
out := new(PingResponse)
err := c.cc.Invoke(ctx, "/mwitkow.testproto.TestService/PingEmpty", in, out, opts...)
if err != nil {
return nil, err
}
return out, nil
}
func (c *testServiceClient) Ping(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*PingResponse, error) {
out := new(PingResponse)
err := c.cc.Invoke(ctx, "/mwitkow.testproto.TestService/Ping", in, out, opts...)
if err != nil {
return nil, err
}
return out, nil
}
func (c *testServiceClient) PingError(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (*emptypb.Empty, error) {
out := new(emptypb.Empty)
err := c.cc.Invoke(ctx, "/mwitkow.testproto.TestService/PingError", in, out, opts...)
if err != nil {
return nil, err
}
return out, nil
}
func (c *testServiceClient) PingList(ctx context.Context, in *PingRequest, opts ...grpc.CallOption) (TestService_PingListClient, error) {
stream, err := c.cc.NewStream(ctx, &TestService_ServiceDesc.Streams[0], "/mwitkow.testproto.TestService/PingList", opts...)
if err != nil {
return nil, err
}
x := &testServicePingListClient{stream}
if err := x.ClientStream.SendMsg(in); err != nil {
return nil, err
}
if err := x.ClientStream.CloseSend(); err != nil {
return nil, err
}
return x, nil
}
type TestService_PingListClient interface {
Recv() (*PingResponse, error)
grpc.ClientStream
}
type testServicePingListClient struct {
grpc.ClientStream
}
func (x *testServicePingListClient) Recv() (*PingResponse, error) {
m := new(PingResponse)
if err := x.ClientStream.RecvMsg(m); err != nil {
return nil, err
}
return m, nil
}
func (c *testServiceClient) PingStream(ctx context.Context, opts ...grpc.CallOption) (TestService_PingStreamClient, error) {
stream, err := c.cc.NewStream(ctx, &TestService_ServiceDesc.Streams[1], "/mwitkow.testproto.TestService/PingStream", opts...)
if err != nil {
return nil, err
}
x := &testServicePingStreamClient{stream}
return x, nil
}
type TestService_PingStreamClient interface {
Send(*PingRequest) error
Recv() (*PingResponse, error)
grpc.ClientStream
}
type testServicePingStreamClient struct {
grpc.ClientStream
}
func (x *testServicePingStreamClient) Send(m *PingRequest) error {
return x.ClientStream.SendMsg(m)
}
func (x *testServicePingStreamClient) Recv() (*PingResponse, error) {
m := new(PingResponse)
if err := x.ClientStream.RecvMsg(m); err != nil {
return nil, err
}
return m, nil
}
// TestServiceServer is the server API for TestService service.
// All implementations must embed UnimplementedTestServiceServer
// for forward compatibility
type TestServiceServer interface {
PingEmpty(context.Context, *emptypb.Empty) (*PingResponse, error)
Ping(context.Context, *PingRequest) (*PingResponse, error)
PingError(context.Context, *PingRequest) (*emptypb.Empty, error)
PingList(*PingRequest, TestService_PingListServer) error
PingStream(TestService_PingStreamServer) error
mustEmbedUnimplementedTestServiceServer()
}
// UnimplementedTestServiceServer must be embedded to have forward compatible implementations.
type UnimplementedTestServiceServer struct {
}
func (UnimplementedTestServiceServer) PingEmpty(context.Context, *emptypb.Empty) (*PingResponse, error) {
return nil, status.Errorf(codes.Unimplemented, "method PingEmpty not implemented")
}
func (UnimplementedTestServiceServer) Ping(context.Context, *PingRequest) (*PingResponse, error) {
return nil, status.Errorf(codes.Unimplemented, "method Ping not implemented")
}
func (UnimplementedTestServiceServer) PingError(context.Context, *PingRequest) (*emptypb.Empty, error) {
return nil, status.Errorf(codes.Unimplemented, "method PingError not implemented")
}
func (UnimplementedTestServiceServer) PingList(*PingRequest, TestService_PingListServer) error {
return status.Errorf(codes.Unimplemented, "method PingList not implemented")
}
func (UnimplementedTestServiceServer) PingStream(TestService_PingStreamServer) error {
return status.Errorf(codes.Unimplemented, "method PingStream not implemented")
}
func (UnimplementedTestServiceServer) mustEmbedUnimplementedTestServiceServer() {}
// UnsafeTestServiceServer may be embedded to opt out of forward compatibility for this service.
// Use of this interface is not recommended, as added methods to TestServiceServer will
// result in compilation errors.
type UnsafeTestServiceServer interface {
mustEmbedUnimplementedTestServiceServer()
}
func RegisterTestServiceServer(s grpc.ServiceRegistrar, srv TestServiceServer) {
s.RegisterService(&TestService_ServiceDesc, srv)
}
func _TestService_PingEmpty_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
in := new(emptypb.Empty)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil {
return srv.(TestServiceServer).PingEmpty(ctx, in)
}
info := &grpc.UnaryServerInfo{
Server: srv,
FullMethod: "/mwitkow.testproto.TestService/PingEmpty",
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) {
return srv.(TestServiceServer).PingEmpty(ctx, req.(*emptypb.Empty))
}
return interceptor(ctx, in, info, handler)
}
func _TestService_Ping_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
in := new(PingRequest)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil {
return srv.(TestServiceServer).Ping(ctx, in)
}
info := &grpc.UnaryServerInfo{
Server: srv,
FullMethod: "/mwitkow.testproto.TestService/Ping",
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) {
return srv.(TestServiceServer).Ping(ctx, req.(*PingRequest))
}
return interceptor(ctx, in, info, handler)
}
func _TestService_PingError_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
in := new(PingRequest)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil {
return srv.(TestServiceServer).PingError(ctx, in)
}
info := &grpc.UnaryServerInfo{
Server: srv,
FullMethod: "/mwitkow.testproto.TestService/PingError",
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) {
return srv.(TestServiceServer).PingError(ctx, req.(*PingRequest))
}
return interceptor(ctx, in, info, handler)
}
func _TestService_PingList_Handler(srv interface{}, stream grpc.ServerStream) error {
m := new(PingRequest)
if err := stream.RecvMsg(m); err != nil {
return err
}
return srv.(TestServiceServer).PingList(m, &testServicePingListServer{stream})
}
type TestService_PingListServer interface {
Send(*PingResponse) error
grpc.ServerStream
}
type testServicePingListServer struct {
grpc.ServerStream
}
func (x *testServicePingListServer) Send(m *PingResponse) error {
return x.ServerStream.SendMsg(m)
}
func _TestService_PingStream_Handler(srv interface{}, stream grpc.ServerStream) error {
return srv.(TestServiceServer).PingStream(&testServicePingStreamServer{stream})
}
type TestService_PingStreamServer interface {
Send(*PingResponse) error
Recv() (*PingRequest, error)
grpc.ServerStream
}
type testServicePingStreamServer struct {
grpc.ServerStream
}
func (x *testServicePingStreamServer) Send(m *PingResponse) error {
return x.ServerStream.SendMsg(m)
}
func (x *testServicePingStreamServer) Recv() (*PingRequest, error) {
m := new(PingRequest)
if err := x.ServerStream.RecvMsg(m); err != nil {
return nil, err
}
return m, nil
}
// TestService_ServiceDesc is the grpc.ServiceDesc for TestService service.
// It's only intended for direct use with grpc.RegisterService,
// and not to be introspected or modified (even as a copy)
var TestService_ServiceDesc = grpc.ServiceDesc{
ServiceName: "mwitkow.testproto.TestService",
HandlerType: (*TestServiceServer)(nil),
Methods: []grpc.MethodDesc{
{
MethodName: "PingEmpty",
Handler: _TestService_PingEmpty_Handler,
},
{
MethodName: "Ping",
Handler: _TestService_Ping_Handler,
},
{
MethodName: "PingError",
Handler: _TestService_PingError_Handler,
},
},
Streams: []grpc.StreamDesc{
{
StreamName: "PingList",
Handler: _TestService_PingList_Handler,
ServerStreams: true,
},
{
StreamName: "PingStream",
Handler: _TestService_PingStream_Handler,
ServerStreams: true,
ClientStreams: true,
},
},
Metadata: "test.proto",
}

158
proxy/testservice/testping.go Normal file
View File

@ -0,0 +1,158 @@
package testservice
import (
"context"
"io"
"reflect"
"testing"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
const (
returnHeader = "test-client-header"
)
// TestTestServiceServerImpl can be called to test the underlying TestServiceServer.
func TestTestServiceServerImpl(t *testing.T, client TestServiceClient) {
t.Run("Unary ping", func(t *testing.T) {
want := "hello, world"
hdr := metadata.MD{}
res, err := client.Ping(context.TODO(), &PingRequest{Value: want}, grpc.Header(&hdr))
if err != nil {
t.Errorf("want no err; got %v", err)
return
}
checkHeaders(t, hdr)
t.Logf("got %v (%d)", res.Value, res.Counter)
if got := res.Value; got != want {
t.Errorf("res.Value = %q; want %q", got, want)
}
})
t.Run("Error ping", func(t *testing.T) {
_, err := client.PingError(context.TODO(), &PingRequest{})
if err == nil {
t.Errorf("want err; got %v", err)
}
})
t.Run("Server streaming ping", func(t *testing.T) {
want := "hello, world"
stream, err := client.PingList(context.TODO(), &PingRequest{Value: want})
if err != nil {
t.Errorf("want no err; got %v", err)
if err := stream.CloseSend(); err != nil {
t.Fatalf("closing send channel: %v", err)
}
return
}
hdr, err := stream.Header()
if err != nil {
t.Errorf("reading headers: %v", err)
}
checkHeaders(t, hdr)
for {
res, err := stream.Recv()
if err != nil {
if err == io.EOF {
checkTrailers(t, stream.Trailer())
return
}
t.Errorf("want no err; got %v", err)
return
}
t.Logf("got %v (%d)", res.Value, res.Counter)
if got := res.Value; got != want {
t.Errorf("res.Value = %q; want %q", got, want)
}
}
})
t.Run("Bidirectional pinging", func(t *testing.T) {
want := "hello, world"
stream, err := client.PingStream(context.TODO())
if err != nil {
t.Errorf("want no err; got %v", err)
if err := stream.CloseSend(); err != nil {
t.Fatalf("closing send channel: %v", err)
}
return
}
d := make(chan struct{})
go func() {
hdr, err := stream.Header()
if err != nil {
t.Errorf("reading headers: %v", err)
}
checkHeaders(t, hdr)
close(d)
}()
for i := 0; i < 25; i++ {
if err := stream.Send(&PingRequest{Value: want}); err != nil {
t.Errorf("want no err; got %v", err)
return
}
res, err := stream.Recv()
if err != nil {
t.Errorf("receiving full duplex stream: %w", err)
return
}
t.Logf("got %v (%d)", res.Value, res.Counter)
if got := res.Value; got != want {
t.Errorf("res.Value = %q; want %q", got, want)
}
if got, want := res.Counter, int32(i); got != want {
t.Errorf("res.Counter = %d; want %d", got, want)
}
}
if err := stream.CloseSend(); err != nil {
t.Errorf("closing full duplex stream: %v", err)
}
<-d
})
t.Run("Unary ping with headers", func(t *testing.T) {
want := "hello, world"
req := &PingRequest{Value: want}
ctx := metadata.AppendToOutgoingContext(context.Background(), returnHeader, "I like turtles.")
inHeader := make(metadata.MD)
res, err := client.Ping(ctx, req, grpc.Header(&inHeader))
if err != nil {
t.Errorf("want no err; got %v", err)
return
}
t.Logf("got %v (%d)", res.Value, res.Counter)
if !reflect.DeepEqual(inHeader.Get(returnHeader), []string{"I like turtles."}) {
t.Errorf("did not receive correct return headers")
}
})
}
func checkTrailers(t *testing.T, md metadata.MD) {
vs := md.Get(PingTrailer)
if want, got := 1, len(vs); want != got {
t.Errorf("trailer %q not present", PingTrailer)
return
}
if want, got := []string{PingTrailerCts}, vs; !reflect.DeepEqual(got, want) {
t.Errorf("trailer mismatch; want %q, got %q", want, got)
}
}
func checkHeaders(t *testing.T, md metadata.MD) {
vs := md.Get(PingHeader)
if want, got := 1, len(vs); want != got {
t.Errorf("header %q not present", PingHeader)
return
}
if want, got := []string{PingHeaderCts}, vs; !reflect.DeepEqual(got, want) {
t.Errorf("header mismatch; want %q, got %q", want, got)
}
}