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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
fmt "fmt"
"io"
"net"
"os"
"github.com/newrelic/go-agent/v3/integrations/nrgrpc"
sampleapp "github.com/newrelic/go-agent/v3/integrations/nrgrpc/example/sampleapp"
newrelic "github.com/newrelic/go-agent/v3/newrelic"
"google.golang.org/grpc"
)
// Server is a gRPC server.
type Server struct{}
// processMessage processes each incoming Message.
func processMessage(ctx context.Context, msg *sampleapp.Message) {
defer newrelic.FromContext(ctx).StartSegment("processMessage").End()
fmt.Printf("Message received: %s\n", msg.Text)
}
// DoUnaryUnary is a unary request, unary response method.
func (s *Server) DoUnaryUnary(ctx context.Context, msg *sampleapp.Message) (*sampleapp.Message, error) {
processMessage(ctx, msg)
return &sampleapp.Message{Text: "Hello from DoUnaryUnary"}, nil
}
// DoUnaryStream is a unary request, stream response method.
func (s *Server) DoUnaryStream(msg *sampleapp.Message, stream sampleapp.SampleApplication_DoUnaryStreamServer) error {
processMessage(stream.Context(), msg)
for i := 0; i < 3; i++ {
if err := stream.Send(&sampleapp.Message{Text: "Hello from DoUnaryStream"}); nil != err {
return err
}
}
return nil
}
// DoStreamUnary is a stream request, unary response method.
func (s *Server) DoStreamUnary(stream sampleapp.SampleApplication_DoStreamUnaryServer) error {
for {
msg, err := stream.Recv()
if err == io.EOF {
return stream.SendAndClose(&sampleapp.Message{Text: "Hello from DoStreamUnary"})
} else if nil != err {
return err
}
processMessage(stream.Context(), msg)
}
}
// DoStreamStream is a stream request, stream response method.
func (s *Server) DoStreamStream(stream sampleapp.SampleApplication_DoStreamStreamServer) error {
for {
msg, err := stream.Recv()
if err == io.EOF {
return nil
} else if nil != err {
return err
}
processMessage(stream.Context(), msg)
if err := stream.Send(&sampleapp.Message{Text: "Hello from DoStreamStream"}); nil != err {
return err
}
}
}
func main() {
app, err := newrelic.NewApplication(
newrelic.ConfigAppName("gRPC Server"),
newrelic.ConfigLicense(os.Getenv("NEW_RELIC_LICENSE_KEY")),
newrelic.ConfigDebugLogger(os.Stdout),
)
if nil != err {
panic(err)
}
lis, err := net.Listen("tcp", "localhost:8080")
if err != nil {
panic(err)
}
grpcServer := grpc.NewServer(
// Add the New Relic gRPC server instrumentation
grpc.UnaryInterceptor(nrgrpc.UnaryServerInterceptor(app)),
grpc.StreamInterceptor(nrgrpc.StreamServerInterceptor(app)),
)
sampleapp.RegisterSampleApplicationServer(grpcServer, &Server{})
grpcServer.Serve(lis)
}
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