32 lines
682 B
Go
32 lines
682 B
Go
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package middleware
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import (
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"net/http"
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"github.com/celrenheit/sandflake"
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"within.website/ln"
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)
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// RequestID appends a unique (sandflake) request ID to each request's
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// X-Request-Id header field, much like Heroku's router does.
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func RequestID(next http.Handler) http.Handler {
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var g sandflake.Generator
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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id := g.Next().String()
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if rid := r.Header.Get("X-Request-Id"); rid != "" {
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id = rid + "," + id
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}
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ctx := ln.WithF(r.Context(), ln.F{
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"request_id": id,
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})
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r = r.WithContext(ctx)
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w.Header().Set("X-Request-Id", id)
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r.Header.Set("X-Request-Id", id)
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next.ServeHTTP(w, r)
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})
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}
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