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conn.go
149 lines (134 loc) · 2.85 KB
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conn.go
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package fncmp
import (
"encoding/json"
"errors"
"log"
"net/http"
"sync"
"github.com/gorilla/websocket"
)
var connPool = conns{
pool: make(map[string]*conn),
}
func (c *conns) Get(id string) (*conn, bool) {
c.mu.Lock()
defer c.mu.Unlock()
conn, ok := c.pool[id]
return conn, ok
}
func (c *conns) Set(id string, conn *conn) {
c.mu.Lock()
defer c.mu.Unlock()
c.pool[id] = conn
}
func (c *conns) Delete(id string) {
c.mu.Lock()
defer c.mu.Unlock()
delete(c.pool, id)
}
type (
conns struct {
mu sync.Mutex
pool map[string]*conn
}
conn struct {
websocket *websocket.Conn
ID string
HandlerID string
Messages chan []byte
}
)
func newConn(w http.ResponseWriter, r *http.Request, handlerID string, ID string) (*conn, error) {
upgrader := websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool {
// TODO: check cookie for session id
// Set as conn id
return true
// host := strings.Split(r.Host, ":")[0]
// return host == "localhost"
},
}
websocket, err := upgrader.Upgrade(w, r, nil)
if err != nil {
return nil, errors.New("failed to upgrade connection")
}
c := &conn{
websocket: websocket,
ID: ID,
HandlerID: handlerID,
Messages: make(chan []byte, 16),
}
connPool.Set(c.ID, c)
return c, nil
}
func (c *conn) close() error {
if c == nil {
return errors.New("cannot close nil connection")
}
evtListeners.Delete(c)
connPool.Delete(c.ID)
c.websocket.Close()
return nil
}
func (c *conn) listen() {
go func(c *conn) {
defer c.close()
// Listen for messages on conn's Messages channel
var dispatch Dispatch
for {
_, message, err := c.websocket.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(
err,
websocket.CloseGoingAway,
websocket.CloseAbnormalClosure,
websocket.CloseNormalClosure,
) {
log.Printf("error: %v", err)
}
close(c.Messages)
break
}
// Parse dispatch from websocket message
err = json.Unmarshal(message, &dispatch)
if err != nil {
log.Printf("error: %v", err)
continue
}
// Get handler from handler pool
handler, ok := handlers.Get(dispatch.HandlerID)
if !ok {
log.Printf("error: handler '%s' not found", dispatch.HandlerID)
continue
}
// Set conn on dispatch
dispatch.conn = c
// Dispatch to handler
handler.in <- dispatch
}
}(c)
for {
msg, ok := <-c.Messages
if !ok {
c.close()
break
}
if err := c.websocket.WriteMessage(1, msg); err != nil {
config.Logger.Error("error writing message", "error", err)
c.close()
}
}
}
func (c *conn) Publish(msg []byte) {
// if msg is not json encodable, return
_, err := json.Marshal(msg)
if err != nil {
config.Logger.Error("error: message not json encodable", "error", err)
return
}
c.Messages <- msg
}
func (c *conn) Write(p []byte) (n int, err error) {
c.Messages <- p
return len(p), nil
}