neko/server/internal/websocket/peer.go

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package websocket
import (
"encoding/json"
"errors"
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"sync"
"github.com/gorilla/websocket"
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"github.com/rs/zerolog"
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"github.com/demodesk/neko/pkg/types"
"github.com/demodesk/neko/pkg/types/event"
"github.com/demodesk/neko/pkg/types/message"
"github.com/demodesk/neko/pkg/utils"
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)
type WebSocketPeerCtx struct {
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mu sync.Mutex
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logger zerolog.Logger
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connection *websocket.Conn
}
func newPeer(logger zerolog.Logger, connection *websocket.Conn) *WebSocketPeerCtx {
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return &WebSocketPeerCtx{
logger: logger.With().Str("submodule", "peer").Logger(),
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connection: connection,
}
}
func (peer *WebSocketPeerCtx) Send(event string, payload any) {
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peer.mu.Lock()
defer peer.mu.Unlock()
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raw, err := json.Marshal(payload)
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if err != nil {
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peer.logger.Err(err).Str("event", event).Msg("message marshalling has failed")
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return
}
err = peer.connection.WriteJSON(types.WebSocketMessage{
Event: event,
Payload: raw,
})
if err != nil {
err = errors.Unwrap(err) // unwrap if possible
peer.logger.Warn().Err(err).Str("event", event).Msg("send message error")
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return
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}
// log events if not ignored
if ok, _ := utils.ArrayIn(event, nologEvents); !ok {
if len(raw) > maxPayloadLogLength {
raw = []byte("<truncated>")
}
peer.logger.Debug().
Str("address", peer.connection.RemoteAddr().String()).
Str("event", event).
Str("payload", string(raw)).
Msg("sending message to client")
}
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}
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func (peer *WebSocketPeerCtx) Ping() error {
peer.mu.Lock()
defer peer.mu.Unlock()
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// application level heartbeat
if err := peer.connection.WriteJSON(types.WebSocketMessage{
Event: event.SYSTEM_HEARTBEAT,
}); err != nil {
return err
}
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return peer.connection.WriteMessage(websocket.PingMessage, nil)
}
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func (peer *WebSocketPeerCtx) Destroy(reason string) {
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peer.Send(
event.SYSTEM_DISCONNECT,
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message.SystemDisconnect{
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Message: reason,
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})
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peer.mu.Lock()
defer peer.mu.Unlock()
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err := peer.connection.Close()
peer.logger.Err(err).Msg("peer connection destroyed")
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}