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|
package discord
import (
"context"
"encoding/json"
"errors"
"fmt"
"jinx/pkg/libs/cancellablewebsocket"
"math/rand"
"net/http"
"time"
"github.com/gorilla/websocket"
"github.com/rs/zerolog"
)
type Discord struct {
token string
logger *zerolog.Logger
conn *cancellablewebsocket.CancellableWebSocket
eventHandler *EventHandlerImpl
rest REST
}
func NewClient(token string, logger *zerolog.Logger) *Discord {
token = "Bot " + token
return &Discord{
token: token,
logger: logger,
conn: nil,
eventHandler: NewEventHandler(),
rest: NewREST(token),
}
}
func (d *Discord) Connect(ctx context.Context) error {
gatewayURL, err := d.rest.Gateway()
if err != nil {
return err
}
connectHeader := http.Header{}
d.conn, err = cancellablewebsocket.Dial(websocket.DefaultDialer, ctx, gatewayURL, connectHeader)
if err != nil {
return err
}
var helloMsg GatewayPayload[GatewayHelloEvent]
if err = d.conn.ReadJSON(&helloMsg); err != nil {
return err
}
if helloMsg.Op != GATEWAY_OP_HELLO {
return fmt.Errorf("expected opcode %d, got %d", GATEWAY_OP_HELLO, helloMsg.Op)
}
go d.heartbeat(ctx, helloMsg.Data.HeartbeatInterval)
if err = d.identify(); err != nil {
return err
}
go d.listen(ctx)
// We are ready!
d.eventHandler.Fire(DISCORD_EVENT_READY, nil)
return nil
}
func (d *Discord) Disconnect() error {
if d.conn == nil {
return errors.New("not connected")
}
return d.conn.Close()
}
func (d *Discord) heartbeat(ctx context.Context, interval uint64) {
// REF: heartbeat_interval * jitter
jitter := rand.Intn(int(interval))
time.Sleep(time.Duration(jitter) * time.Millisecond)
ticker := time.NewTicker(time.Duration(interval) * time.Millisecond)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
d.logger.Debug().Msg("sending heartbeat")
msg := GatewayPayload[any]{
Op: GATEWAY_OP_HEARTBEAT,
}
if err := d.conn.WriteJSON(msg); err != nil {
d.logger.Error().Err(err).Msg("error sending heartbeat")
}
}
}
}
func (d *Discord) identify() error {
msg := GatewayPayload[GatewayIdentifyMsg]{
Op: GATEWAY_OP_IDENTIFY,
Data: GatewayIdentifyMsg{
Token: d.token,
Intents: 13991,
Properties: GatewayIdentifyProperties{
OS: "linux",
Browser: "jinx",
Device: "jinx",
},
},
Sequence: 0,
}
if err := d.conn.WriteJSON(msg); err != nil {
return err
}
var res GatewayPayload[GatewayReadyEvent]
if err := d.conn.ReadJSON(&res); err != nil {
return err
}
d.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 (d *Discord) listen(ctx context.Context) {
for {
var msg GatewayPayload[json.RawMessage]
if err := d.conn.ReadJSON(&msg); err != nil {
d.logger.Error().Err(err).Msg("error reading message")
}
select {
case <-ctx.Done():
return
default:
d.onEvent(msg)
}
}
}
func (d *Discord) onEvent(msg GatewayPayload[json.RawMessage]) error {
switch msg.Op {
case GATEWAY_OP_HEARTBEAT_ACK:
d.logger.Debug().Msg("received heartbeat ack.")
case GATEWAY_OP_HEARTBEAT:
return errors.New("on demand heartbeat not implemented")
case GATEWAY_OP_DISPATCH:
return d.onDispatch(msg.EventName, msg.Data)
default:
d.logger.Warn().Msgf("received unknown opcode: %d", msg.Op)
}
return nil
}
func (d *Discord) 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
}
d.eventHandler.Fire(DISCORD_EVENT_MESSAGE, payload)
default:
d.logger.Warn().Msgf("received unknown event: %s", eventName)
}
return nil
}
func (d *Discord) SendMessage(channelID Snowflake, content string) error {
return d.rest.SendMessage(channelID, content)
}
func (d *Discord) AddEventHandler(eventName DiscordEvent, handler func(payload any)) {
d.eventHandler.Add(eventName, handler)
}
|
