gRPC transport initial work with crossdock testing

Dockerfile.crossdock

@@ -1,6 +1,6 @@
 FROM golang:1.8.1
 
-EXPOSE 8080-8088
+EXPOSE 8080-8090
 ENV SUPPRESS_DOCKER 1
 WORKDIR /go/src/go.uber.org/yarpc
 ADD dockercrossdockdeps.mk /go/src/go.uber.org/yarpc/

build/local.mk

@@ -1,6 +1,7 @@
 # Paths besides auto-detected generated files that should be excluded from
 # lint results.
-LINT_EXCLUDES_EXTRAS =
+LINT_EXCLUDES_EXTRAS = \
+	transport/x/grpc/handler.go
 
 # Regex for 'go vet' rules to ignore
 GOVET_IGNORE_RULES = \

docker-compose.yml

@@ -34,7 +34,11 @@ services:
             - AXIS_HTTPSERVER=go
             - AXIS_CLIENT_ONEWAY=go
             - AXIS_SERVER_ONEWAY=go
-            - AXIS_TRANSPORT_ONEWAY=http,redis,cherami
+            - AXIS_TRANSPORT_ONEWAY=grpc,http,redis,cherami
+            - AXIS_TRANSPORT_ONEWAY_CTXPROPAGATION=http,redis,cherami
+            - AXIS_GO_ENCODING=raw,json,thrift,protobuf
+            - AXIS_GO_CLIENT=go
+            - AXIS_GO_SERVER=go
 
             # Transports available to the ctxpropagation behavior for multihop
             # requests.
@@ -45,6 +49,8 @@ services:
             - BEHAVIOR_JSON=client,server,transport
             - SKIP_JSON=client:java+transport:tchannel,server:java+transport:tchannel
             - BEHAVIOR_THRIFT=client,server,transport
+            - BEHAVIOR_PROTOBUF=go_client,go_server,transport
+            - BEHAVIOR_GRPC=go_client,go_server,go_encoding
             - SKIP_THRIFT=client:java+transport:tchannel,server:java+transport:tchannel
             - BEHAVIOR_HEADERS=client,server,transport,encoding
             - SKIP_HEADERS=client:java+transport:tchannel,server:java+transport:tchannel
@@ -70,7 +76,7 @@ services:
             - BEHAVIOR_CTXPROPAGATION=ctxclient,ctxserver,transport,ctxavailabletransports
             - BEHAVIOR_APACHETHRIFT=apachethriftclient,apachethriftserver
             - BEHAVIOR_ONEWAY=client_oneway,server_oneway,transport_oneway,encoding
-            - BEHAVIOR_ONEWAY_CTXPROPAGATION=client_oneway,server_oneway,transport_oneway
+            - BEHAVIOR_ONEWAY_CTXPROPAGATION=client_oneway,server_oneway,transport_oneway_ctxpropagation
 
             - REPORT=compact
 
@@ -83,7 +89,7 @@ services:
           context: .
           dockerfile: Dockerfile.crossdock
         ports:
-            - "8080-8088"
+            - "8080-8090"
         environment:
             - REDIS=enabled
             - CHERAMI=enabled

encoding/x/protobuf/inbound.go

@@ -66,6 +66,9 @@ func (u *unaryHandler) Handle(ctx context.Context, transportRequest *transport.R
 		}
 	}
 	response, appErr := u.handle(ctx, request)
+	if appErr != nil {
+		responseWriter.SetApplicationError()
+	}
 	if err := call.WriteToResponse(responseWriter); err != nil {
 		return err
 	}
@@ -78,9 +81,23 @@ func (u *unaryHandler) Handle(ctx context.Context, transportRequest *transport.R
 		}
 		responseData = protoBuffer.Bytes()
 	}
+	// We have to detect if our transport requires a raw response
+	// It is not possible to propagate this information on ctx with the current API
+	// we we attach this in the relevant transport (currently only gRPC) on the headers
+	// If we are sending a raw response back to a YARPC client, it needs to understand
+	// this is happening, so we attach the headers on the response as well
+	// Other clients (namely the existing gRPC clients outside of YARPC) understand
+	// that the response is the raw response.
+	if isRawResponse(transportRequest.Headers) {
+		responseWriter.AddHeaders(getRawResponseHeaders())
+		_, err := responseWriter.Write(responseData)
+		if err != nil {
+			return err
+		}
+		return appErr
+	}
 	var wireError *wirepb.Error
 	if appErr != nil {
-		responseWriter.SetApplicationError()
 		wireError = &wirepb.Error{
 			appErr.Error(),
 		}

encoding/x/protobuf/outbound.go

@@ -78,6 +78,15 @@ func (c *client) Call(
 	if responseData == nil {
 		return nil, nil
 	}
+	// TODO: the error from Call will be the application error, we might
+	// also have a response returned however
+	if isRawResponse(transportResponse.Headers) {
+		response := newResponse()
+		if err := proto.Unmarshal(responseData, response); err != nil {
+			return nil, encoding.ResponseBodyDecodeError(transportRequest, err)
+		}
+		return response, nil
+	}
 	wireResponse := &wirepb.Response{}
 	if err := proto.Unmarshal(responseData, wireResponse); err != nil {
 		return nil, encoding.ResponseBodyDecodeError(transportRequest, err)

encoding/x/protobuf/protoc-gen-yarpc-go/main.go

@@ -50,6 +50,7 @@ package main
 import (
 	"fmt"
 	"log"
+	"strings"
 	"text/template"
 
 	"go.uber.org/yarpc/internal/protoplugin"
@@ -79,7 +80,7 @@ type {{$service.GetName}}YarpcClient interface {
 
 // New{{$service.GetName}}YarpcClient builds a new yarpc client for the {{$service.GetName}} service.
 func New{{$service.GetName}}YarpcClient(clientConfig transport.ClientConfig) {{$service.GetName}}YarpcClient {
-	return &_{{$service.GetName}}YarpcCaller{protobuf.NewClient("{{$service.GetName}}", clientConfig)}
+	return &_{{$service.GetName}}YarpcCaller{protobuf.NewClient("{{trimPrefixPeriod $service.FQSN}}", clientConfig)}
 }
 
 // {{$service.GetName}}YarpcServer is the yarpc server-side interface for the {{$service.GetName}} service.
@@ -94,7 +95,7 @@ type {{$service.GetName}}YarpcServer interface {
 func Build{{$service.GetName}}YarpcProcedures(server {{$service.GetName}}YarpcServer) []transport.Procedure {
 	handler := &_{{$service.GetName}}YarpcHandler{server}
 	return protobuf.BuildProcedures(
-		"{{$service.GetName}}",
+		"{{trimPrefixPeriod $service.FQSN}}",
 		map[string]transport.UnaryHandler{
 		{{range $method := unaryMethods $service}}"{{$method.GetName}}": protobuf.NewUnaryHandler(handler.{{$method.GetName}}, new{{$service.GetName}}_{{$method.GetName}}YarpcRequest),
 		{{end}}
@@ -181,7 +182,7 @@ var (
 {{end}}
 `
 
-var funcMap = template.FuncMap{"unaryMethods": unaryMethods, "onewayMethods": onewayMethods}
+var funcMap = template.FuncMap{"unaryMethods": unaryMethods, "onewayMethods": onewayMethods, "trimPrefixPeriod": trimPrefixPeriod}
 
 func main() {
 	if err := protoplugin.Run(
@@ -230,3 +231,7 @@ func onewayMethods(service *protoplugin.Service) ([]*protoplugin.Method, error)
 	}
 	return methods, nil
 }
+
+func trimPrefixPeriod(s string) string {
+	return strings.TrimPrefix(s, ".")
+}

encoding/x/protobuf/testing/benchmark_test.go

@@ -41,8 +41,8 @@ func benchmarkIntegrationForTransportType(b *testing.B, transportType testutils.
 		transportType,
 		keyValueYarpcServer,
 		sinkYarpcServer,
-		func(keyValueYarpcClient examplepb.KeyValueYarpcClient, sinkYarpcClient examplepb.SinkYarpcClient) error {
-			benchmarkIntegration(b, keyValueYarpcClient, sinkYarpcClient, keyValueYarpcServer, sinkYarpcServer)
+		func(clients *example.Clients) error {
+			benchmarkIntegration(b, clients.KeyValueYarpcClient, clients.SinkYarpcClient, keyValueYarpcServer, sinkYarpcServer)
 			return nil
 		},
 	)

encoding/x/protobuf/testing/testing.go

@@ -19,3 +19,8 @@
 // THE SOFTWARE.
 
 package testing
+
+import (
+	// this is to make sure scripts/cover.sh picks this up with .Deps
+	_ "go.uber.org/yarpc/internal/examples/protobuf/example"
+)

encoding/x/protobuf/testing/testing_test.go

@@ -25,7 +25,6 @@ import (
 	"testing"
 	"time"
 
-	"go.uber.org/yarpc/encoding/x/protobuf"
 	"go.uber.org/yarpc/internal/examples/protobuf/example"
 	"go.uber.org/yarpc/internal/examples/protobuf/examplepb"
 	"go.uber.org/yarpc/internal/testutils"
@@ -50,8 +49,8 @@ func testIntegrationForTransportType(t *testing.T, transportType testutils.Trans
 			transportType,
 			keyValueYarpcServer,
 			sinkYarpcServer,
-			func(keyValueYarpcClient examplepb.KeyValueYarpcClient, sinkYarpcClient examplepb.SinkYarpcClient) error {
-				testIntegration(t, keyValueYarpcClient, sinkYarpcClient, keyValueYarpcServer, sinkYarpcServer)
+			func(clients *example.Clients) error {
+				testIntegration(t, clients, keyValueYarpcServer, sinkYarpcServer)
 				return nil
 			},
 		),
@@ -60,37 +59,41 @@ func testIntegrationForTransportType(t *testing.T, transportType testutils.Trans
 
 func testIntegration(
 	t *testing.T,
-	keyValueYarpcClient examplepb.KeyValueYarpcClient,
-	sinkYarpcClient examplepb.SinkYarpcClient,
+	clients *example.Clients,
 	keyValueYarpcServer *example.KeyValueYarpcServer,
 	sinkYarpcServer *example.SinkYarpcServer,
 ) {
-	_, err := getValue(keyValueYarpcClient, "foo")
+	_, err := getValue(clients.KeyValueYarpcClient, "foo")
+	assert.Error(t, err)
+	_, err = getValueGRPC(clients.KeyValueGRPCClient, "foo")
 	assert.Error(t, err)
-	assert.NotNil(t, protobuf.GetApplicationError(err))
 
-	assert.NoError(t, setValue(keyValueYarpcClient, "foo", "bar"))
-	value, err := getValue(keyValueYarpcClient, "foo")
+	assert.NoError(t, setValue(clients.KeyValueYarpcClient, "foo", "bar"))
+	value, err := getValue(clients.KeyValueYarpcClient, "foo")
 	assert.NoError(t, err)
 	assert.Equal(t, "bar", value)
 
-	assert.NoError(t, setValue(keyValueYarpcClient, "foo", ""))
-	_, err = getValue(keyValueYarpcClient, "foo")
+	assert.NoError(t, setValueGRPC(clients.KeyValueGRPCClient, "foo", "barGRPC"))
+	value, err = getValueGRPC(clients.KeyValueGRPCClient, "foo")
+	assert.NoError(t, err)
+	assert.Equal(t, "barGRPC", value)
+
+	assert.NoError(t, setValue(clients.KeyValueYarpcClient, "foo", ""))
+	_, err = getValue(clients.KeyValueYarpcClient, "foo")
 	assert.Error(t, err)
-	assert.NotNil(t, protobuf.GetApplicationError(err))
 
-	assert.NoError(t, setValue(keyValueYarpcClient, "foo", "baz"))
-	assert.NoError(t, setValue(keyValueYarpcClient, "baz", "bat"))
-	value, err = getValue(keyValueYarpcClient, "foo")
+	assert.NoError(t, setValue(clients.KeyValueYarpcClient, "foo", "baz"))
+	assert.NoError(t, setValue(clients.KeyValueYarpcClient, "baz", "bat"))
+	value, err = getValue(clients.KeyValueYarpcClient, "foo")
 	assert.NoError(t, err)
 	assert.Equal(t, "baz", value)
-	value, err = getValue(keyValueYarpcClient, "baz")
+	value, err = getValue(clients.KeyValueYarpcClient, "baz")
 	assert.NoError(t, err)
 	assert.Equal(t, "bat", value)
 
-	assert.NoError(t, fire(sinkYarpcClient, "foo"))
+	assert.NoError(t, fire(clients.SinkYarpcClient, "foo"))
 	assert.NoError(t, sinkYarpcServer.WaitFireDone())
-	assert.NoError(t, fire(sinkYarpcClient, "bar"))
+	assert.NoError(t, fire(clients.SinkYarpcClient, "bar"))
 	assert.NoError(t, sinkYarpcServer.WaitFireDone())
 	assert.Equal(t, []string{"foo", "bar"}, sinkYarpcServer.Values())
 }
@@ -112,6 +115,23 @@ func setValue(keyValueYarpcClient examplepb.KeyValueYarpcClient, key string, val
 	return err
 }
 
+func getValueGRPC(keyValueGRPCClient examplepb.KeyValueClient, key string) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
+	defer cancel()
+	response, err := keyValueGRPCClient.GetValue(ctx, &examplepb.GetValueRequest{key})
+	if err != nil {
+		return "", err
+	}
+	return response.Value, nil
+}
+
+func setValueGRPC(keyValueGRPCClient examplepb.KeyValueClient, key string, value string) error {
+	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
+	defer cancel()
+	_, err := keyValueGRPCClient.SetValue(ctx, &examplepb.SetValueRequest{key, value})
+	return err
+}
+
 func fire(sinkYarpcClient examplepb.SinkYarpcClient, value string) error {
 	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
 	defer cancel()

encoding/x/protobuf/types.go

@@ -31,17 +31,26 @@ import (
 	"github.com/gogo/protobuf/proto"
 )
 
-// Encoding is the name of this encoding.
-const Encoding transport.Encoding = "protobuf"
+const (
+	// Encoding is the name of this encoding.
+	Encoding transport.Encoding = "protobuf"
 
-// GetApplicationError returns the application error from the server, if present.
+	rawResponseHeaderKey = "yarpc-protobuf-raw-response"
+)
+
+// SetRawResponse will set rawResponseHeaderKey to "true".
 //
-// TODO: this has overlap with IsApplicationError
-func GetApplicationError(err error) error {
-	if applicationError, ok := err.(*applicationError); ok {
-		return applicationError
-	}
-	return nil
+// rawResponseHeaderKey is a header key attached to either a request or
+// response that signals a UnaryHandler to not encode an application error
+// inside a wirepb.Response object, instead marshalling the actual response.
+//
+// Note per the documentation on transport.Headers#With, the returned Header
+// may not be the same as the input header, so the caller should always
+// update the header with:
+//
+//   header = protobuf.SetRawResponse(header)
+func SetRawResponse(headers transport.Headers) transport.Headers {
+	return headers.With(rawResponseHeaderKey, "1")
 }
 
 // ***all below functions should only be called by generated code***
@@ -118,3 +127,12 @@ func NewOnewayHandler(
 func CastError(expectedType proto.Message, actualType proto.Message) error {
 	return fmt.Errorf("expected proto.Message to have type %T but had type %T", expectedType, actualType)
 }
+
+func isRawResponse(headers transport.Headers) bool {
+	rawResponse, ok := headers.Get(rawResponseHeaderKey)
+	return ok && rawResponse == "1"
+}
+
+func getRawResponseHeaders() transport.Headers {
+	return SetRawResponse(transport.Headers{})
+}