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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package testapp
import (
"context"
"encoding/json"
"io"
newrelic "github.com/newrelic/go-agent"
codes "google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
status "google.golang.org/grpc/status"
)
// Server is a gRPC server.
type Server struct{}
// DoUnaryUnary is a unary request, unary response method.
func (s *Server) DoUnaryUnary(ctx context.Context, msg *Message) (*Message, error) {
defer newrelic.StartSegment(newrelic.FromContext(ctx), "DoUnaryUnary").End()
md, _ := metadata.FromIncomingContext(ctx)
js, _ := json.Marshal(md)
return &Message{Text: string(js)}, nil
}
// DoUnaryStream is a unary request, stream response method.
func (s *Server) DoUnaryStream(msg *Message, stream TestApplication_DoUnaryStreamServer) error {
defer newrelic.StartSegment(newrelic.FromContext(stream.Context()), "DoUnaryStream").End()
md, _ := metadata.FromIncomingContext(stream.Context())
js, _ := json.Marshal(md)
for i := 0; i < 3; i++ {
if err := stream.Send(&Message{Text: string(js)}); nil != err {
return err
}
}
return nil
}
// DoStreamUnary is a stream request, unary response method.
func (s *Server) DoStreamUnary(stream TestApplication_DoStreamUnaryServer) error {
defer newrelic.StartSegment(newrelic.FromContext(stream.Context()), "DoStreamUnary").End()
md, _ := metadata.FromIncomingContext(stream.Context())
js, _ := json.Marshal(md)
for {
_, err := stream.Recv()
if err == io.EOF {
return stream.SendAndClose(&Message{Text: string(js)})
} else if nil != err {
return err
}
}
}
// DoStreamStream is a stream request, stream response method.
func (s *Server) DoStreamStream(stream TestApplication_DoStreamStreamServer) error {
defer newrelic.StartSegment(newrelic.FromContext(stream.Context()), "DoStreamStream").End()
md, _ := metadata.FromIncomingContext(stream.Context())
js, _ := json.Marshal(md)
for {
_, err := stream.Recv()
if err == io.EOF {
return nil
} else if nil != err {
return err
}
if err := stream.Send(&Message{Text: string(js)}); nil != err {
return err
}
}
}
// DoUnaryUnaryError is a unary request, unary response method that returns an
// error.
func (s *Server) DoUnaryUnaryError(ctx context.Context, msg *Message) (*Message, error) {
return &Message{}, status.New(codes.DataLoss, "oooooops!").Err()
}
// DoUnaryStreamError is a unary request, unary response method that returns an
// error.
func (s *Server) DoUnaryStreamError(msg *Message, stream TestApplication_DoUnaryStreamErrorServer) error {
return status.New(codes.DataLoss, "oooooops!").Err()
}
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