gateway.go

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
)

// TODO: log to file

func main() {

	http.HandleFunc("/data", dataHandler)
	http.HandleFunc("/heartbeat", heartbeatHandler)

	if err := http.ListenAndServeTLS(
		":48820",
		"/etc/pki/tls/certs/gateway.crt",
		"/etc/pki/tls/private/gateway.key",
		nil); err != nil {
		fmt.Printf("Error serving TLS: %v\n", err)
	}
}

func dataHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Printf("Got data from: %v at %v\n", r.Header.Get("uuid"), r.Header.Get("time"))
	body, _ := ioutil.ReadAll(r.Body)
	var data map[string][]StampedReading
	if err := json.Unmarshal(body, &data); err != nil {
		fmt.Printf("Error unmarshalling body: %v\n", err)
	} else {
		fmt.Printf("Data received: %v\n", data)
	}
	w.WriteHeader(200)
}

func heartbeatHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Printf("Got heartbeat from %v@%v at %v\n",
		r.Header.Get(headerUUID),
		r.RemoteAddr,
		r.Header.Get(headerTimestamp))

	w.WriteHeader(200)
}