mirror of
https://github.com/teivah/100-go-mistakes.git
synced 2026-06-22 17:37:12 +08:00
33 lines
586 B
Go
33 lines
586 B
Go
package main
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import (
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"context"
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"net/http"
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)
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type key string
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const isValidHostKey key = "isValidHost"
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func checkValid(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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validHost := r.Host == "acme"
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ctx := context.WithValue(r.Context(), isValidHostKey, validHost)
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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func handler(ctx context.Context, ch chan Message) error {
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for {
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select {
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case msg := <-ch:
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// Do something with msg
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_ = msg
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case <-ctx.Done():
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return ctx.Err()
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}
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}
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}
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type Message struct{}
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