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:sparkles: middleware to validate query param and create request id
+42
-2
+2
go.mod
+2
go.mod
+2
go.sum
+2
go.sum
+6
-2
main.go
+6
-2
main.go
···
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package main
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import (
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+
"fmt"
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"log"
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"net/http"
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)
···
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pubsub := NewPubSub()
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r := &http.ServeMux{}
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r.HandleFunc("GET /subscribe", pubsub.HandleSubscribe)
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r.HandleFunc("POST /publish", pubsub.HandlePublish)
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r.HandleFunc("GET /subscribe", middlewareRequestId(middlewareTopicQueryParam(pubsub.HandleSubscribe)))
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r.HandleFunc("POST /publish", middlewareRequestId(middlewareTopicQueryParam(pubsub.HandlePublish)))
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server := http.Server{Addr: ":8000", Handler: r}
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fmt.Println("Starting server on 0.0.0.0:8000")
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if err := server.ListenAndServe(); err != nil {
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log.Fatal(err)
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} else {
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fmt.Println("Killing server")
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}
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}
+32
middleware.go
+32
middleware.go
···
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package main
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+
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import (
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"context"
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"errors"
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"net/http"
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"github.com/google/uuid"
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)
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func middlewareTopicQueryParam(next http.HandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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topicName := r.URL.Query().Get("topic")
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if topicName == "" {
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http.Error(w, errors.New("Missing 'topic' query param").Error(), http.StatusBadRequest)
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return
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}
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next.ServeHTTP(w, r)
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}
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}
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func middlewareRequestId(next http.HandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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id, _ := uuid.NewV7()
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ctx := context.WithValue(r.Context(), "REQUEST_ID", id.String())
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r = r.WithContext(ctx)
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next.ServeHTTP(w, r)
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}
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}