forked from adamthesax/grpc-proxy
/
ping.go
168 lines (141 loc) · 3.68 KB
/
ping.go
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package testservice
import (
"context"
"fmt"
"io"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/types/known/emptypb"
)
var DefaultTestServiceServer = defaultPingServer{}
const (
PingHeader = "ping-header"
PingHeaderCts = "Arbitrary header text"
PingTrailer = "ping-trailer"
PingTrailerCts = "Arbitrary trailer text"
PingEchoHeader = "ping-echo-header"
PingEchoTrailer = "ping-echo-trailer"
)
// defaultPingServer is the canonical implementation of a TestServiceServer.
type defaultPingServer struct {
UnsafeTestServiceServer
}
func (s defaultPingServer) PingEmpty(ctx context.Context, empty *emptypb.Empty) (*PingResponse, error) {
if err := s.sendHeader(ctx); err != nil {
return nil, err
}
if err := s.setTrailer(ctx); err != nil {
return nil, err
}
return &PingResponse{}, nil
}
func (s defaultPingServer) Ping(ctx context.Context, request *PingRequest) (*PingResponse, error) {
if err := s.sendHeader(ctx); err != nil {
return nil, err
}
if err := s.setTrailer(ctx); err != nil {
return nil, err
}
return &PingResponse{Value: request.Value}, nil
}
func (s defaultPingServer) PingError(ctx context.Context, request *PingRequest) (*emptypb.Empty, error) {
if err := s.sendHeader(ctx); err != nil {
return nil, err
}
if err := s.setTrailer(ctx); err != nil {
return nil, err
}
return nil, status.Error(codes.Unknown, "Something is wrong and this is a message that describes it")
}
func (s defaultPingServer) PingList(request *PingRequest, server TestService_PingListServer) error {
if err := s.sendHeader(server.Context()); err != nil {
return err
}
s.setStreamTrailer(server)
for i := 0; i < 10; i++ {
if err := server.Send(&PingResponse{
Value: request.Value,
Counter: int32(i),
}); err != nil {
return err
}
}
return nil
}
func (s defaultPingServer) PingStream(server TestService_PingStreamServer) error {
g, ctx := errgroup.WithContext(context.Background())
if err := s.sendHeader(server.Context()); err != nil {
return err
}
pings := make(chan *PingRequest)
g.Go(func() error {
defer close(pings)
for {
m, err := server.Recv()
if err != nil {
if err == io.EOF {
return nil
}
return err
}
select {
case pings <- m:
case <-ctx.Done():
return ctx.Err()
}
}
})
g.Go(func() error {
var i int32
for m := range pings {
if err := server.Send(&PingResponse{
Value: m.Value,
Counter: i,
}); err != nil {
return err
}
i++
}
return nil
})
return g.Wait()
}
func (s *defaultPingServer) sendHeader(ctx context.Context) error {
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
md = metadata.New(nil)
}
if tvs := md.Get(PingEchoHeader); len(tvs) > 0 {
md.Append(PingEchoHeader, tvs...)
}
md.Append(PingHeader, PingHeaderCts)
if err := grpc.SendHeader(ctx, md); err != nil {
return fmt.Errorf("setting header: %w", err)
}
return nil
}
func (s *defaultPingServer) setTrailer(ctx context.Context) error {
md := s.buildTrailer(ctx)
if err := grpc.SetTrailer(ctx, md); err != nil {
return fmt.Errorf("setting trailer: %w", err)
}
return nil
}
func (s *defaultPingServer) buildTrailer(ctx context.Context) metadata.MD {
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
md = metadata.New(nil)
}
if tvs := md.Get(PingEchoTrailer); len(tvs) > 0 {
md.Append(PingEchoTrailer, tvs...)
}
md.Append(PingTrailer, PingTrailerCts)
return md
}
func (s defaultPingServer) setStreamTrailer(server grpc.ServerStream) {
server.SetTrailer(s.buildTrailer(server.Context()))
}
var _ TestServiceServer = (*defaultPingServer)(nil)