-
Notifications
You must be signed in to change notification settings - Fork 71
/
main.go
111 lines (86 loc) 路 2.74 KB
/
main.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
package main
import (
"context"
"fmt"
"log"
"net"
pb "github.com/kubeshop/tracetest/quick-start-grpc-stream-propagation/producer-api/proto"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
"go.opentelemetry.io/otel/trace"
grpc "google.golang.org/grpc"
)
// Implement the PaymentReceiverServer interface
type serverImpl struct {
pb.PaymentReceiverServer
tracer trace.Tracer
}
type paymentWithMetadata struct {
payment *pb.Payment
metadata map[string]string
}
// Guarantee that the serverImpl implements the PaymentReceiverServer interface
var _ pb.PaymentReceiverServer = &serverImpl{}
// Channel to store payments and used as a "in-memory" queue
var paymentChannel = make(chan *paymentWithMetadata)
func (s *serverImpl) ReceivePayment(ctx context.Context, payment *pb.Payment) (*pb.ReceivePaymentResponse, error) {
go func() {
ctx, span := s.tracer.Start(ctx, "EnqueuePayment")
defer span.End()
message := &paymentWithMetadata{
payment: payment,
metadata: extractMetadataFromContext(ctx),
}
// handle channel as in-memory queue
paymentChannel <- message
}()
return &pb.ReceivePaymentResponse{Received: true}, nil
}
func (s *serverImpl) NotifyPayment(_ *pb.Empty, stream pb.PaymentReceiver_NotifyPaymentServer) error {
for {
message, ok := <-paymentChannel
if !ok {
return nil
}
ctx := injectMetadataIntoContext(context.Background(), message.metadata)
ctx, span := s.tracer.Start(ctx, "SendPaymentNotification")
payment := message.payment
highValuePayment := payment.Amount > 10_000
notification := &pb.PaymentNotification{
Payment: payment,
HighValuePayment: highValuePayment,
}
// extract OTel data from context and add it to the notification
notification.Metadata = extractMetadataFromContext(ctx)
if err := stream.Send(notification); err != nil {
return err
}
span.End()
}
}
func main() {
port := getEnvVar("PORT", "8080")
otelExporterEndpoint := getEnvVar("OTEL_EXPORTER_OTLP_ENDPOINT", "localhost:4317")
otelServiceName := getEnvVar("OTEL_SERVICE_NAME", "producer-api")
tracer, err := setupOpenTelemetry(context.Background(), otelExporterEndpoint, otelServiceName)
if err != nil {
log.Fatalf("failed to initialize OpenTelemetry: %v", err)
return
}
address := fmt.Sprintf(":%s", port)
lis, err := net.Listen("tcp", address)
if err != nil {
log.Fatalf("failed to listen: %v", err)
return
}
log.Printf("server listening at %s", lis.Addr())
grpcServer := grpc.NewServer(
grpc.StatsHandler(otelgrpc.NewServerHandler()),
)
paymentReceiverServer := &serverImpl{
tracer: tracer,
}
pb.RegisterPaymentReceiverServer(grpcServer, paymentReceiverServer)
if err := grpcServer.Serve(lis); err != nil {
log.Fatalf("failed to serve: %v", err)
}
}