Initial commit

go.mod

@@ -0,0 +1,13 @@
+module robbyzambito.me/http-nats-proxy/v2
+
+go 1.23.2
+
+require github.com/nats-io/nats.go v1.38.0
+
+require (
+	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/nats-io/nkeys v0.4.9 // indirect
+	github.com/nats-io/nuid v1.0.1 // indirect
+	golang.org/x/crypto v0.31.0 // indirect
+	golang.org/x/sys v0.28.0 // indirect
+)

go.sum

@@ -0,0 +1,12 @@
+github.com/klauspost/compress v1.17.9 h1:6KIumPrER1LHsvBVuDa0r5xaG0Es51mhhB9BQB2qeMA=
+github.com/klauspost/compress v1.17.9/go.mod h1:Di0epgTjJY877eYKx5yC51cX2A2Vl2ibi7bDH9ttBbw=
+github.com/nats-io/nats.go v1.38.0 h1:A7P+g7Wjp4/NWqDOOP/K6hfhr54DvdDQUznt5JFg9XA=
+github.com/nats-io/nats.go v1.38.0/go.mod h1:IGUM++TwokGnXPs82/wCuiHS02/aKrdYUQkU8If6yjw=
+github.com/nats-io/nkeys v0.4.9 h1:qe9Faq2Gxwi6RZnZMXfmGMZkg3afLLOtrU+gDZJ35b0=
+github.com/nats-io/nkeys v0.4.9/go.mod h1:jcMqs+FLG+W5YO36OX6wFIFcmpdAns+w1Wm6D3I/evE=
+github.com/nats-io/nuid v1.0.1 h1:5iA8DT8V7q8WK2EScv2padNa/rTESc1KdnPw4TC2paw=
+github.com/nats-io/nuid v1.0.1/go.mod h1:19wcPz3Ph3q0Jbyiqsd0kePYG7A95tJPxeL+1OSON2c=
+golang.org/x/crypto v0.31.0 h1:ihbySMvVjLAeSH1IbfcRTkD/iNscyz8rGzjF/E5hV6U=
+golang.org/x/crypto v0.31.0/go.mod h1:kDsLvtWBEx7MV9tJOj9bnXsPbxwJQ6csT/x4KIN4Ssk=
+golang.org/x/sys v0.28.0 h1:Fksou7UEQUWlKvIdsqzJmUmCX3cZuD2+P3XyyzwMhlA=
+golang.org/x/sys v0.28.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

main.go

@@ -0,0 +1,72 @@
+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))
+}