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|
package discord
import (
"context"
"encoding/json"
"fmt"
"jinx/pkg/libs/cancellablewebsocket"
"net/http"
"github.com/gorilla/websocket"
"github.com/rs/zerolog"
)
type Gateway interface {
Start(ctx context.Context, url string, token string) error
Close() error
Heartbeat() error
}
var _ Gateway = &GatewayImpl{}
type GatewayImpl struct {
ctx context.Context
logger *zerolog.Logger
conn *cancellablewebsocket.CancellableWebSocket
heartbeat Heartbeat
eventHandler EventHandler
lastSeq uint64
}
func NewGateway(logger *zerolog.Logger, eventHandler EventHandler) *GatewayImpl {
gateway := &GatewayImpl{
ctx: nil,
logger: logger,
conn: nil,
eventHandler: eventHandler,
heartbeat: nil,
lastSeq: 0,
}
// Cycle dependency, is this the best way to do this?
heartbeat := NewHeartbeat(logger, gateway)
gateway.heartbeat = heartbeat
return gateway
}
func (g *GatewayImpl) Start(ctx context.Context, url string, token string) error {
connectHeader := http.Header{}
conn, err := cancellablewebsocket.Dial(websocket.DefaultDialer, ctx, url, connectHeader)
if err != nil {
return err
}
g.conn = conn
g.ctx = ctx
hello, err := g.hello()
if err != nil {
return err
}
g.heartbeat.Start(ctx, hello.HeartbeatInterval)
if err = g.identify(token); err != nil {
return err
}
go g.listen()
return nil
}
func (g *GatewayImpl) Close() error {
return g.conn.Close()
}
func (g *GatewayImpl) Heartbeat() error {
msg := GatewayPayload[uint64]{
Op: GATEWAY_OP_HEARTBEAT,
Data: g.lastSeq,
}
return g.send(msg)
}
func (g *GatewayImpl) hello() (GatewayHelloEvent, error) {
var msg GatewayPayload[GatewayHelloEvent]
if err := receive(g, &msg); err != nil {
return GatewayHelloEvent{}, err
}
if msg.Op != GATEWAY_OP_HELLO {
return GatewayHelloEvent{}, fmt.Errorf("expected opcode %d, got %d", GATEWAY_OP_HELLO, msg.Op)
}
return msg.Data, nil
}
func (g *GatewayImpl) identify(token string) error {
msg := GatewayPayload[GatewayIdentifyMsg]{
Op: GATEWAY_OP_IDENTIFY,
Data: GatewayIdentifyMsg{
Token: token,
Intents: 13991,
Properties: GatewayIdentifyProperties{
OS: "linux",
Browser: "jinx",
Device: "jinx",
},
},
Sequence: 0,
}
if err := g.send(msg); err != nil {
return err
}
var res GatewayPayload[GatewayReadyEvent]
if err := receive(g, &res); err != nil {
return err
}
g.logger.Debug().Msgf("identify response payload: %+v", res)
if res.Op != GATEWAY_OP_DISPATCH {
return fmt.Errorf("expected opcode %d, got %d", GATEWAY_OP_DISPATCH, res.Op)
}
if res.EventName != "READY" {
return fmt.Errorf("expected event name %s, got %s", "READY", res.EventName)
}
return nil
}
func (g *GatewayImpl) listen() {
for {
var msg GatewayPayload[json.RawMessage]
if err := receive(g, &msg); err != nil {
g.logger.Error().Err(err).Msgf("error reading message")
continue
}
select {
case <-g.ctx.Done():
return
default:
g.onEvent(msg)
}
}
}
func (g *GatewayImpl) onEvent(msg GatewayPayload[json.RawMessage]) error {
switch msg.Op {
case GATEWAY_OP_HEARTBEAT_ACK:
g.heartbeat.Ack()
case GATEWAY_OP_HEARTBEAT:
g.heartbeat.ForceHeartbeat()
case GATEWAY_OP_DISPATCH:
return g.onDispatch(msg.EventName, msg.Data)
default:
g.logger.Warn().Msgf("received unknown opcode: %d", msg.Op)
}
return nil
}
func (g *GatewayImpl) onDispatch(eventName string, body json.RawMessage) error {
switch eventName {
case "MESSAGE_CREATE":
var payload GatewayMessageCreateEvent
if err := json.Unmarshal(body, &payload); err != nil {
return err
}
g.eventHandler.Fire(DISCORD_EVENT_MESSAGE, payload)
default:
g.logger.Warn().Msgf("received unknown event: %s", eventName)
}
return nil
}
func (g *GatewayImpl) send(payload any) error {
return g.conn.WriteJSON(payload)
}
func receive[D any](g *GatewayImpl, res *GatewayPayload[D]) error {
err := g.conn.ReadJSON(&res)
if err != nil {
return err
}
if res.Sequence != 0 {
g.lastSeq = res.Sequence
}
return nil
}
|
