premier jet

go.mod

@@ -0,0 +1,3 @@
+module git.passke.org/laurentu/http-multicaster
+
+go 1.23.2

http-multicaster.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"sync"
+)
+
+var backends = []string{
+	"http://backend1.local/api",
+	"http://backend2.local/api",
+	"http://backend3.local/api",
+}
+
+func forwardRequestToBackend(wg *sync.WaitGroup, client *http.Client, backend string, req *http.Request, responses chan<- string) {
+	defer wg.Done()
+
+	// Recréer la requête HTTP
+	forwardReq, err := http.NewRequest(req.Method, backend, req.Body)
+	if err != nil {
+		log.Printf("Error creating request for %s: %v", backend, err)
+		responses <- fmt.Sprintf("Error: %v", err)
+		return
+	}
+
+	// Copier les en-têtes de la requête originale
+	forwardReq.Header = req.Header.Clone()
+
+	// Envoyer la requête au backend
+	resp, err := client.Do(forwardReq)
+	if err != nil {
+		log.Printf("Error forwarding to %s: %v", backend, err)
+		responses <- fmt.Sprintf("Error: %v", err)
+		return
+	}
+	defer resp.Body.Close()
+
+	// Lire la réponse du backend
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		log.Printf("Error reading response from %s: %v", backend, err)
+		responses <- fmt.Sprintf("Error: %v", err)
+		return
+	}
+
+	// Ajouter la réponse dans le canal
+	responses <- fmt.Sprintf("Response from %s: %s", backend, body)
+}
+
+func handler(w http.ResponseWriter, req *http.Request) {
+	client := &http.Client{}
+	var wg sync.WaitGroup
+	responses := make(chan string, len(backends))
+
+	// Forward la requête vers chaque backend
+	for _, backend := range backends {
+		wg.Add(1)
+		go forwardRequestToBackend(&wg, client, backend, req, responses)
+	}
+
+	// Attendre la fin de toutes les requêtes
+	wg.Wait()
+	close(responses)
+
+	// Collecter et afficher les réponses des backends
+	for response := range responses {
+		fmt.Fprintf(w, "%s\n", response)
+	}
+}
+
+func main() {
+	http.HandleFunc("/", handler)
+	fmt.Println("Starting server on :8080...")
+	if err := http.ListenAndServe(":8080", nil); err != nil {
+		log.Fatalf("Server failed: %v", err)
+	}
+}