Implemented getting chainparams.json as a starting step to "daisy pull"

blockwebserver.go

@@ -34,9 +34,21 @@ func blockWebSendBlock(w http.ResponseWriter, r *http.Request) {
 	// log.Println("Done serving block", blockHeight)
 }
 
+func blockWebSendChainParams(w http.ResponseWriter, r *http.Request) {
+	log.Println("Serving chainparams.json to", r.RemoteAddr)
+
+	w.Header().Set("Content-Type", "application/json")
+	w.Header().Set("Content-Disposition", "attachment; filename=\"chainparams.json\"")
+	_, err := w.Write(jsonifyWhateverToBytes(chainParams))
+	if err != nil {
+		log.Println(err)
+	}
+}
+
 func blockWebServer() {
 	r := mux.NewRouter()
 	r.HandleFunc("/block/{height}", blockWebSendBlock)
+	r.HandleFunc("/chainparams.json", blockWebSendChainParams)
 
 	serverAddress := fmt.Sprintf(":%d", cfg.httpPort)
 

config.go

@@ -26,7 +26,7 @@ var cfg struct {
 	configFile     string
 	P2pPort        int    `json:"p2p_port"`
 	DataDir        string `json:"data_dir"`
-	httpPort       int
+	httpPort       int    `json:"http_port"`
 	showHelp       bool
 	faster         bool
 	p2pBlockInline bool

util.go

@@ -267,7 +267,7 @@ func (ss *StringSetWithExpiry) TestAndSet(s string) bool {
 	return ok
 }
 
-// Convert whatever to JSON
+// Convert whatever to a JSON string
 func jsonifyWhatever(i interface{}) string {
 	jsonb, err := json.Marshal(i)
 	if err != nil {
@@ -276,6 +276,15 @@ func jsonifyWhatever(i interface{}) string {
 	return string(jsonb)
 }
 
+// Convert whatever to JSON bytes
+func jsonifyWhateverToBytes(i interface{}) []byte {
+	jsonb, err := json.Marshal(i)
+	if err != nil {
+		log.Panic(err)
+	}
+	return jsonb
+}
+
 // Splits an address string in the form of "host:port" into its separate host and port parts
 func splitAddress(address string) (string, int, error) {
 	i := strings.LastIndex(address, ":") // Not using strings.Split because of IPv6