// RPC : transmit data via UDP
func (m *Module) RPC(host string, method string, args ...string) ([]byte, error) {
// parse UDP addresses
udpRemoteAddress, err := net.ResolveUDPAddr("udp", host)
if err != nil {
return nil, err
}
udpClientAddress, err := net.ResolveUDPAddr("udp", "0.0.0.0:0")
if err != nil {
return nil, err
}
// open client socket
conn, err := net.DialUDP("udp", udpClientAddress, udpRemoteAddress)
if err != nil {
return nil, err
}
defer conn.Close()
reader := bufio.NewReader(conn)
writer := bufio.NewWriter(conn)
var a api.RemoteCall
a.Action = method
a.Args = args
b, err := json.Marshal(a)
if err != nil {
return nil, err
}
// send data
writer.Write(b)
writer.WriteByte(DELIM)
writer.Flush()
// get response
resp, err := reader.ReadBytes(DELIM)
if err != nil {
log.Println(err.Error())
return nil, err
}
return resp, nil
}
// RPC : client interface
func (h *Module) RPC(host string, method string, args ...string) ([]byte, error) {
var a api.RemoteCall
a.Action = method
a.Args = args
b, err := json.Marshal(a)
if err != nil {
return nil, err
}
//log.Println("POSTING: " + string(b))
req, _ := http.NewRequest("POST", "https://"+host, bytes.NewReader(b))
//req.Close = true
req.Header.Add("Accept", "application/json")
resp, err := h.client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
buf, err := ioutil.ReadAll(resp.Body)
return buf, err
}