-
Notifications
You must be signed in to change notification settings - Fork 302
/
correlation_interceptor.go
51 lines (44 loc) · 1.95 KB
/
correlation_interceptor.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
// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// 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.
package events
import (
"context"
"fmt"
grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
const requestIDKey = "x-request-id"
func extractOrGenerateCorrelationID(ctx context.Context, fullMethod string) context.Context {
md, _ := metadata.FromIncomingContext(ctx)
var id string
if xRequestID := md.Get(requestIDKey); len(xRequestID) > 0 {
id = xRequestID[len(xRequestID)-1]
} else {
id = NewCorrelationID()
}
ctx = ContextWithCorrelationID(ctx, fmt.Sprintf("rpc:%s:%s", fullMethod, id))
return ctx
}
// UnaryServerInterceptor returns a new unary server interceptor that modifies the context to include a correlation ID.
func UnaryServerInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
ctx = extractOrGenerateCorrelationID(ctx, info.FullMethod)
return handler(ctx, req)
}
// StreamServerInterceptor returns a new streaming server interceptor that that modifies the context.
func StreamServerInterceptor(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
wrapped := grpc_middleware.WrapServerStream(stream)
wrapped.WrappedContext = extractOrGenerateCorrelationID(stream.Context(), info.FullMethod)
return handler(srv, wrapped)
}