/
websocket.go
84 lines (66 loc) · 1.73 KB
/
websocket.go
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package web
import (
"fmt"
"log"
"github.com/gorilla/websocket"
)
type MessageHandler func(client *WSClient, msg string) error
type CloseHandler func()
type WSClient struct {
conn *websocket.Conn
inbox chan string
onClose CloseHandler
}
func NewWSClient(conn *websocket.Conn, onMessage MessageHandler, onClose CloseHandler) *WSClient {
client := WSClient{
conn: conn,
inbox: make(chan string, 100),
onClose: onClose,
}
go func() {
if err := client.readMessages(onMessage); err != nil {
log.Printf("failed to read client messages: %v", err)
}
}()
go func() {
if err := client.writeMessages(); err != nil {
log.Printf("failed to write to client: %v", err)
}
}()
return &client
}
func (c *WSClient) WriteMessage(msg string) {
c.inbox <- msg
}
func (c *WSClient) Close() error {
defer c.onClose()
if err := c.conn.Close(); err != nil {
return fmt.Errorf("failed to close WSClient connection: %w", err)
}
return nil
}
func (c *WSClient) readMessages(onMessage MessageHandler) error {
defer close(c.inbox)
for {
msgType, msg, err := c.conn.ReadMessage()
if err != nil {
return fmt.Errorf("failed to read message from websocket connection: %w", err)
}
if msgType != websocket.TextMessage {
log.Println("Received unsupported message type - skipping message.")
continue
}
if err := onMessage(c, string(msg)); err != nil {
return fmt.Errorf("failed to handle message %q: %w", string(msg), err)
}
}
}
func (c *WSClient) writeMessages() error {
defer c.Close()
for msg := range c.inbox {
if err := c.conn.WriteMessage(websocket.TextMessage, []byte(msg)); err != nil {
return fmt.Errorf("failed to write message to websocket connection %q: %w", msg, err)
}
}
return nil
}