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Implement traceid.Transport & add example usage (#1)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| package traceid | ||
|
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| import ( | ||
| "context" | ||
| "net/http" | ||
|
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| "github.com/google/uuid" | ||
| ) | ||
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| func Middleware(next http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| ctx := r.Context() | ||
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| traceID := r.Header.Get(Header) | ||
| if _, err := uuid.Parse(traceID); err != nil { | ||
| traceID = uuidV7() | ||
| } | ||
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| ctx = context.WithValue(ctx, ctxKey{}, traceID) | ||
| w.Header().Set(Header, traceID) | ||
| next.ServeHTTP(w, r.WithContext(ctx)) | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package traceid | ||
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| import ( | ||
| "net/http" | ||
| ) | ||
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| func Transport(next http.RoundTripper) http.RoundTripper { | ||
| return RoundTripFunc(func(req *http.Request) (resp *http.Response, err error) { | ||
| r := cloneRequest(req) | ||
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| traceID, _ := r.Context().Value(ctxKey{}).(string) | ||
| if traceID == "" { | ||
| traceID = uuidV7() | ||
| } | ||
| r.Header.Set(http.CanonicalHeaderKey(Header), traceID) | ||
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| return next.RoundTrip(r) | ||
| }) | ||
| } | ||
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| // RoundTripFunc, similar to http.HandlerFunc, is an adapter | ||
| // to allow the use of ordinary functions as http.RoundTrippers. | ||
| type RoundTripFunc func(r *http.Request) (*http.Response, error) | ||
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| func (f RoundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) { | ||
| return f(req) | ||
| } | ||
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| // cloneRequest creates a shallow copy of a given request | ||
| // to comply with stdlib's http.RoundTripper contract: | ||
| // | ||
| // RoundTrip should not modify the request, except for | ||
| // consuming and closing the Request's Body. RoundTrip may | ||
| // read fields of the request in a separate goroutine. Callers | ||
| // should not mutate or reuse the request until the Response's | ||
| // Body has been closed. | ||
| func cloneRequest(orig *http.Request) *http.Request { | ||
| clone := &http.Request{} | ||
| *clone = *orig | ||
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| clone.Header = make(http.Header, len(orig.Header)) | ||
| for key, value := range orig.Header { | ||
| clone.Header[key] = append([]string{}, value...) | ||
| } | ||
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| return clone | ||
| } |