39 lines
811 B
Go
39 lines
811 B
Go
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package middleware
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import (
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"context"
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"crypto/rand"
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"encoding/hex"
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"net/http"
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)
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type requestIDKey struct{}
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func RequestID(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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requestID := r.Header.Get("X-Request-ID")
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if requestID == "" {
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requestID = newRequestID()
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}
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w.Header().Set("X-Request-ID", requestID)
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ctx := context.WithValue(r.Context(), requestIDKey{}, requestID)
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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func RequestIDFromContext(ctx context.Context) string {
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if value, ok := ctx.Value(requestIDKey{}).(string); ok {
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return value
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}
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return ""
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}
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func newRequestID() string {
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var data [16]byte
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if _, err := rand.Read(data[:]); err != nil {
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return "request-id-unavailable"
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}
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return hex.EncodeToString(data[:])
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}
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