/
ws.go
123 lines (107 loc) · 2.51 KB
/
ws.go
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package ws
import (
"net/http"
"time"
"github.com/chazapp/o11y/apps/wall_api/metrics"
"github.com/chazapp/o11y/apps/wall_api/models"
"github.com/gin-gonic/gin"
"github.com/gorilla/websocket"
"github.com/rs/zerolog/log"
)
var WsReadBufferSize = 1024
var WsWriteBufferSize = 1024
var WsTimeoutSeconds = 10
var ChannelSize = 255
var wsupgrader = websocket.Upgrader{
ReadBufferSize: WsReadBufferSize,
WriteBufferSize: WsWriteBufferSize,
CheckOrigin: func(_ *http.Request) bool {
return true
},
}
type Client struct {
hub *Hub
conn *websocket.Conn
send chan models.WallMessage
}
type Hub struct {
clients map[*Client]bool
Broadcast chan models.WallMessage
register chan *Client
}
func NewHub() *Hub {
metrics.WSClients.Set(0)
return &Hub{
Broadcast: make(chan models.WallMessage, ChannelSize),
register: make(chan *Client),
clients: make(map[*Client]bool),
}
}
func (h *Hub) Run() {
for {
select {
case client := <-h.register:
h.clients[client] = true
metrics.WSClients.Inc()
case message := <-h.Broadcast:
for client := range h.clients {
select {
case client.send <- message:
default:
close(client.send)
}
}
}
}
}
func (c *Client) writePump() {
ticker := time.NewTicker(time.Duration(WsTimeoutSeconds) * time.Second)
defer func() {
ticker.Stop()
c.conn.Close()
metrics.WSClients.Dec()
delete(c.hub.clients, c)
log.Error().Msg("Removed wwebsocket via defer")
}()
log.Info().Msg("Started write pump")
for {
select {
case message, ok := <-c.send:
if err := c.conn.SetWriteDeadline(time.Now().Add(time.Duration(WsTimeoutSeconds) * time.Second)); err != nil {
log.Err(err)
return
}
if !ok {
log.Error().Msg("Hub closing write pump")
_ = c.conn.WriteMessage(websocket.CloseMessage, []byte{})
return
}
if err := c.conn.WriteJSON(message); err != nil {
log.Err(err)
return
}
case <-ticker.C:
if err := c.conn.SetWriteDeadline(time.Now().Add(time.Duration(WsTimeoutSeconds) * time.Second)); err != nil {
log.Err(err)
return
}
if err := c.conn.WriteMessage(websocket.PingMessage, nil); err != nil {
log.Err(err)
return
}
}
}
}
func (h *Hub) WsHandler(c *gin.Context) {
conn, err := wsupgrader.Upgrade(c.Writer, c.Request, nil)
if err != nil {
log.Err(err)
return
}
client := &Client{hub: h, conn: conn, send: make(chan models.WallMessage, ChannelSize)}
client.hub.register <- client
go client.writePump()
}
func (h *Hub) GetCountConnectedClients() int {
return len(h.clients)
}