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package main
import (
"fmt"
"io/ioutil"
"log"
"net/http"
"strings"
"time"
"github.com/nats-io/nats.go"
)
func main() {
// Connect to NATS server
nc, err := nats.Connect(nats.DefaultURL)
if err != nil {
log.Fatal(err)
}
defer nc.Close()
// HTTP handler function
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
// Read the request body
body, err := ioutil.ReadAll(r.Body)
if err != nil {
http.Error(w, "Error reading request body", http.StatusInternalServerError)
return
}
defer r.Body.Close()
// Drop the leading slash if there is one, and replace slashes with dots.
subject := strings.ReplaceAll(strings.TrimPrefix(r.URL.Path, "/"), "/", ".")
// Create a NATS message with the request body and headers
msg := nats.Msg{
Subject: fmt.Sprintf("http.%s", subject),
Data: body,
Header: nats.Header{},
}
log.Println("subject:", msg.Subject)
// Copy HTTP headers to NATS message headers
for key, values := range r.Header {
for _, value := range values {
msg.Header.Add(key, value)
}
}
// Send request to NATS and wait for reply
reply, err := nc.RequestMsg(&msg, 30*time.Second)
if err != nil {
http.Error(w, "Error processing request", http.StatusInternalServerError)
log.Println("Error processing the request", err)
return
}
// Copy NATS reply headers to HTTP response
for key, values := range reply.Header {
for _, value := range values {
w.Header().Add(key, value)
}
}
// Write NATS reply body to HTTP response
w.Write(reply.Data)
})
// Start HTTP server
fmt.Println("Server is running on http://localhost:8080")
log.Fatal(http.ListenAndServe(":8080", nil))
}
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