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inbound.go
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inbound.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package protobuf
import (
"context"
"github.com/gogo/protobuf/proto"
apiencoding "go.uber.org/yarpc/api/encoding"
"go.uber.org/yarpc/api/transport"
"go.uber.org/yarpc/pkg/errors"
)
type unaryHandler struct {
handle func(context.Context, proto.Message) (proto.Message, error)
newRequest func() proto.Message
}
func newUnaryHandler(
handle func(context.Context, proto.Message) (proto.Message, error),
newRequest func() proto.Message,
) *unaryHandler {
return &unaryHandler{handle, newRequest}
}
func (u *unaryHandler) Handle(ctx context.Context, transportRequest *transport.Request, responseWriter transport.ResponseWriter) error {
ctx, call, request, err := getProtoRequest(ctx, transportRequest, u.newRequest)
if err != nil {
return err
}
response, appErr := u.handle(ctx, request)
if err := call.WriteToResponse(responseWriter); err != nil {
return err
}
var responseData []byte
var responseCleanup func()
if response != nil {
responseData, responseCleanup, err = marshal(transportRequest.Encoding, response)
if responseCleanup != nil {
defer responseCleanup()
}
if err != nil {
return errors.ResponseBodyEncodeError(transportRequest, err)
}
}
_, err = responseWriter.Write(responseData)
if err != nil {
return err
}
if appErr != nil {
responseWriter.SetApplicationError()
}
return appErr
}
type onewayHandler struct {
handleOneway func(context.Context, proto.Message) error
newRequest func() proto.Message
}
func newOnewayHandler(
handleOneway func(context.Context, proto.Message) error,
newRequest func() proto.Message,
) *onewayHandler {
return &onewayHandler{handleOneway, newRequest}
}
func (o *onewayHandler) HandleOneway(ctx context.Context, transportRequest *transport.Request) error {
ctx, _, request, err := getProtoRequest(ctx, transportRequest, o.newRequest)
if err != nil {
return err
}
return o.handleOneway(ctx, request)
}
func getProtoRequest(ctx context.Context, transportRequest *transport.Request, newRequest func() proto.Message) (context.Context, *apiencoding.InboundCall, proto.Message, error) {
if err := errors.ExpectEncodings(transportRequest, Encoding, JSONEncoding); err != nil {
return nil, nil, nil, err
}
ctx, call := apiencoding.NewInboundCall(ctx)
if err := call.ReadFromRequest(transportRequest); err != nil {
return nil, nil, nil, err
}
request := newRequest()
if err := unmarshal(transportRequest.Encoding, transportRequest.Body, request); err != nil {
return nil, nil, nil, errors.RequestBodyDecodeError(transportRequest, err)
}
return ctx, call, request, nil
}