injectForwardedRequestMetadata implements HTTPHeaderPropagationClientInterceptor and HTTPHeaderPropagationStreamClientInterceptor by inserting headers that are supposed to be forwarded into metadata of the request
(ctx context.Context)
| 82 | // injectForwardedRequestMetadata implements HTTPHeaderPropagationClientInterceptor and HTTPHeaderPropagationStreamClientInterceptor |
| 83 | // by inserting headers that are supposed to be forwarded into metadata of the request |
| 84 | func injectForwardedRequestMetadata(ctx context.Context) context.Context { |
| 85 | requestMetadataMap := requestmeta.MapFromContext(ctx) |
| 86 | if requestMetadataMap == nil { |
| 87 | return ctx |
| 88 | } |
| 89 | md, ok := metadata.FromOutgoingContext(ctx) |
| 90 | if !ok { |
| 91 | md = metadata.New(map[string]string{}) |
| 92 | } |
| 93 | |
| 94 | newCtx := ctx |
| 95 | if _, ok := md[requestmeta.PropagationStringForRequestMetadata]; !ok { |
| 96 | var mdContent []string |
| 97 | for requestMetadata, content := range requestMetadataMap { |
| 98 | mdContent = append(mdContent, requestMetadata, content) |
| 99 | } |
| 100 | md = md.Copy() |
| 101 | md[requestmeta.PropagationStringForRequestMetadata] = mdContent |
| 102 | newCtx = metadata.NewOutgoingContext(ctx, md) |
| 103 | } |
| 104 | return newCtx |
| 105 | } |