forked from mordillo123/sockjs-go-client
/
xhr.go
138 lines (119 loc) · 2.5 KB
/
xhr.go
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package sockjs
import (
"bytes"
"encoding/json"
"errors"
"github.com/dchest/uniuri"
"io/ioutil"
"log"
"net/http"
"time"
)
type XHR struct {
Address string
TransportAddress string
ServerID string
SessionID string
Inbound chan []byte
}
func NewXHR(address string) (*XHR, error) {
xhr := &XHR{
Address: address,
ServerID: paddedRandomIntn(999),
SessionID: uniuri.New(),
}
xhr.TransportAddress = address + "/" + xhr.ServerID + "/" + xhr.SessionID
if err := xhr.Init(); err != nil {
return nil, err
}
xhr.StartReading()
return xhr, nil
}
func (x *XHR) Init() error {
req, err := http.NewRequest("POST", x.TransportAddress+"/xhr", nil)
if err != nil {
return err
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
if body[0] != 'o' {
return errors.New("Invalid initial message")
}
return nil
}
func (x *XHR) StartReading() {
go func() {
client := &http.Client{
Timeout: time.Minute,
}
for {
req, err := http.NewRequest("POST", x.TransportAddress+"/xhr", nil)
if err != nil {
log.Print(err)
continue
}
resp, err := client.Do(req)
if err != nil {
log.Print(err)
continue
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Print(err)
continue
}
switch data[0] {
case 'h':
// Heartbeat
continue
case 'a':
// Normal message
x.Inbound <- data[1:]
case 'c':
// Session closed
var v []interface{}
if err := json.Unmarshal(data[1:], &v); err != nil {
log.Printf("Closing session: %s", err)
break
}
log.Printf("%v: %v", v[0], v[1])
break
}
}
}()
}
func (x *XHR) ReadJSON(v interface{}) error {
message := <-x.Inbound
return json.Unmarshal(message, v)
}
func (x *XHR) WriteJSON(v interface{}) error {
message, err := json.Marshal(v)
if err != nil {
return err
}
req, err := http.NewRequest("POST", x.TransportAddress+"/xhr_send", bytes.NewReader(message))
if err != nil {
return err
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != 204 {
return errors.New("Invalid HTTP code - " + resp.Status)
}
return nil
}
func (x *XHR) Close() error {
// Unimplemented
return nil
}