blob: cda3b497869714ec588ce30be5bb132f526e77d5 [file] [log] [blame]
/*
*
* Copyright 2018 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
// Binary server is an example server.
package main
import (
"context"
"flag"
"fmt"
"io"
"log"
"math/rand"
"net"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
pb "google.golang.org/grpc/examples/features/proto/echo"
)
var port = flag.Int("port", 50051, "the port to serve on")
const (
timestampFormat = time.StampNano
streamingCount = 10
)
type server struct {
pb.UnimplementedEchoServer
}
func (s *server) UnaryEcho(ctx context.Context, in *pb.EchoRequest) (*pb.EchoResponse, error) {
fmt.Printf("--- UnaryEcho ---\n")
// Create trailer in defer to record function return time.
defer func() {
trailer := metadata.Pairs("timestamp", time.Now().Format(timestampFormat))
grpc.SetTrailer(ctx, trailer)
}()
// Read metadata from client.
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return nil, status.Errorf(codes.DataLoss, "UnaryEcho: failed to get metadata")
}
if t, ok := md["timestamp"]; ok {
fmt.Printf("timestamp from metadata:\n")
for i, e := range t {
fmt.Printf(" %d. %s\n", i, e)
}
}
// Create and send header.
header := metadata.New(map[string]string{"location": "MTV", "timestamp": time.Now().Format(timestampFormat)})
grpc.SendHeader(ctx, header)
fmt.Printf("request received: %v, sending echo\n", in)
return &pb.EchoResponse{Message: in.Message}, nil
}
func (s *server) ServerStreamingEcho(in *pb.EchoRequest, stream pb.Echo_ServerStreamingEchoServer) error {
fmt.Printf("--- ServerStreamingEcho ---\n")
// Create trailer in defer to record function return time.
defer func() {
trailer := metadata.Pairs("timestamp", time.Now().Format(timestampFormat))
stream.SetTrailer(trailer)
}()
// Read metadata from client.
md, ok := metadata.FromIncomingContext(stream.Context())
if !ok {
return status.Errorf(codes.DataLoss, "ServerStreamingEcho: failed to get metadata")
}
if t, ok := md["timestamp"]; ok {
fmt.Printf("timestamp from metadata:\n")
for i, e := range t {
fmt.Printf(" %d. %s\n", i, e)
}
}
// Create and send header.
header := metadata.New(map[string]string{"location": "MTV", "timestamp": time.Now().Format(timestampFormat)})
stream.SendHeader(header)
fmt.Printf("request received: %v\n", in)
// Read requests and send responses.
for i := 0; i < streamingCount; i++ {
fmt.Printf("echo message %v\n", in.Message)
err := stream.Send(&pb.EchoResponse{Message: in.Message})
if err != nil {
return err
}
}
return nil
}
func (s *server) ClientStreamingEcho(stream pb.Echo_ClientStreamingEchoServer) error {
fmt.Printf("--- ClientStreamingEcho ---\n")
// Create trailer in defer to record function return time.
defer func() {
trailer := metadata.Pairs("timestamp", time.Now().Format(timestampFormat))
stream.SetTrailer(trailer)
}()
// Read metadata from client.
md, ok := metadata.FromIncomingContext(stream.Context())
if !ok {
return status.Errorf(codes.DataLoss, "ClientStreamingEcho: failed to get metadata")
}
if t, ok := md["timestamp"]; ok {
fmt.Printf("timestamp from metadata:\n")
for i, e := range t {
fmt.Printf(" %d. %s\n", i, e)
}
}
// Create and send header.
header := metadata.New(map[string]string{"location": "MTV", "timestamp": time.Now().Format(timestampFormat)})
stream.SendHeader(header)
// Read requests and send responses.
var message string
for {
in, err := stream.Recv()
if err == io.EOF {
fmt.Printf("echo last received message\n")
return stream.SendAndClose(&pb.EchoResponse{Message: message})
}
message = in.Message
fmt.Printf("request received: %v, building echo\n", in)
if err != nil {
return err
}
}
}
func (s *server) BidirectionalStreamingEcho(stream pb.Echo_BidirectionalStreamingEchoServer) error {
fmt.Printf("--- BidirectionalStreamingEcho ---\n")
// Create trailer in defer to record function return time.
defer func() {
trailer := metadata.Pairs("timestamp", time.Now().Format(timestampFormat))
stream.SetTrailer(trailer)
}()
// Read metadata from client.
md, ok := metadata.FromIncomingContext(stream.Context())
if !ok {
return status.Errorf(codes.DataLoss, "BidirectionalStreamingEcho: failed to get metadata")
}
if t, ok := md["timestamp"]; ok {
fmt.Printf("timestamp from metadata:\n")
for i, e := range t {
fmt.Printf(" %d. %s\n", i, e)
}
}
// Create and send header.
header := metadata.New(map[string]string{"location": "MTV", "timestamp": time.Now().Format(timestampFormat)})
stream.SendHeader(header)
// Read requests and send responses.
for {
in, err := stream.Recv()
if err == io.EOF {
return nil
}
if err != nil {
return err
}
fmt.Printf("request received %v, sending echo\n", in)
if err := stream.Send(&pb.EchoResponse{Message: in.Message}); err != nil {
return err
}
}
}
func main() {
flag.Parse()
rand.Seed(time.Now().UnixNano())
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
fmt.Printf("server listening at %v\n", lis.Addr())
s := grpc.NewServer()
pb.RegisterEchoServer(s, &server{})
s.Serve(lis)
}