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package melody
import (
"errors"
"net/http"
"sync"
"time"
"github.com/gorilla/websocket"
)
// Session wrapper around websocket connections.
type Session struct {
Request *http.Request
Keys map[string]interface{}
conn *websocket.Conn
output chan *envelope
melody *Melody
open bool
rwmutex *sync.RWMutex
}
func (s *Session) writeMessage(message *envelope) {
if s.closed() {
s.melody.errorHandler(s, errors.New("tried to write to closed a session"))
return
}
select {
case s.output <- message:
default:
s.melody.errorHandler(s, errors.New("session message buffer is full"))
}
}
func (s *Session) writeRaw(message *envelope) error {
if s.closed() {
return errors.New("tried to write to a closed session")
}
s.conn.SetWriteDeadline(time.Now().Add(s.melody.Config.WriteWait))
err := s.conn.WriteMessage(message.t, message.msg)
if err != nil {
return err
}
return nil
}
func (s *Session) closed() bool {
s.rwmutex.RLock()
defer s.rwmutex.RUnlock()
return !s.open
}
func (s *Session) close() {
if !s.closed() {
s.rwmutex.Lock()
s.open = false
s.conn.Close()
close(s.output)
s.rwmutex.Unlock()
}
}
func (s *Session) ping() {
s.writeRaw(&envelope{t: websocket.PingMessage, msg: []byte{}})
}
func (s *Session) writePump() {
ticker := time.NewTicker(s.melody.Config.PingPeriod)
defer ticker.Stop()
loop:
for {
select {
case msg, ok := <-s.output:
if !ok {
break loop
}
err := s.writeRaw(msg)
if err != nil {
s.melody.errorHandler(s, err)
break loop
}
if msg.t == websocket.CloseMessage {
break loop
}
if msg.t == websocket.TextMessage {
s.melody.messageSentHandler(s, msg.msg)
}
if msg.t == websocket.BinaryMessage {
s.melody.messageSentHandlerBinary(s, msg.msg)
}
case <-ticker.C:
s.ping()
}
}
}
func (s *Session) readPump() {
s.conn.SetReadLimit(s.melody.Config.MaxMessageSize)
s.conn.SetReadDeadline(time.Now().Add(s.melody.Config.PongWait))
s.conn.SetPongHandler(func(string) error {
s.conn.SetReadDeadline(time.Now().Add(s.melody.Config.PongWait))
s.melody.pongHandler(s)
return nil
})
if s.melody.closeHandler != nil {
s.conn.SetCloseHandler(func(code int, text string) error {
return s.melody.closeHandler(s, code, text)
})
}
for {
t, message, err := s.conn.ReadMessage()
if err != nil {
s.melody.errorHandler(s, err)
break
}
if t == websocket.TextMessage {
s.melody.messageHandler(s, message)
}
if t == websocket.BinaryMessage {
s.melody.messageHandlerBinary(s, message)
}
}
}
// Write writes message to session.
func (s *Session) Write(msg []byte) error {
if s.closed() {
return errors.New("session is closed")
}
s.writeMessage(&envelope{t: websocket.TextMessage, msg: msg})
return nil
}
// WriteBinary writes a binary message to session.
func (s *Session) WriteBinary(msg []byte) error {
if s.closed() {
return errors.New("session is closed")
}
s.writeMessage(&envelope{t: websocket.BinaryMessage, msg: msg})
return nil
}
// Close closes session.
func (s *Session) Close() error {
if s.closed() {
return errors.New("session is already closed")
}
s.writeMessage(&envelope{t: websocket.CloseMessage, msg: []byte{}})
return nil
}
// CloseWithMsg closes the session with the provided payload.
// Use the FormatCloseMessage function to format a proper close message payload.
func (s *Session) CloseWithMsg(msg []byte) error {
if s.closed() {
return errors.New("session is already closed")
}
s.writeMessage(&envelope{t: websocket.CloseMessage, msg: msg})
return nil
}
// Set is used to store a new key/value pair exclusivelly for this session.
// It also lazy initializes s.Keys if it was not used previously.
func (s *Session) Set(key string, value interface{}) {
if s.Keys == nil {
s.Keys = make(map[string]interface{})
}
s.Keys[key] = value
}
// Get returns the value for the given key, ie: (value, true).
// If the value does not exists it returns (nil, false)
func (s *Session) Get(key string) (value interface{}, exists bool) {
if s.Keys != nil {
value, exists = s.Keys[key]
}
return
}
// MustGet returns the value for the given key if it exists, otherwise it panics.
func (s *Session) MustGet(key string) interface{} {
if value, exists := s.Get(key); exists {
return value
}
panic("Key \"" + key + "\" does not exist")
}
// IsClosed returns the status of the connection.
func (s *Session) IsClosed() bool {
return s.closed()
}
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