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|
package discord
import (
"context"
"errors"
"fmt"
"log"
"math/rand"
"net/http"
"time"
"github.com/gorilla/websocket"
)
type Discord struct {
token string
conn *websocket.Conn
rest REST
}
func NewClient(token string) *Discord {
return &Discord{
token: token,
conn: nil,
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 = websocket.DefaultDialer.Dial(gatewayURL, connectHeader)
if err != nil {
return err
}
var helloMsg GatewayPayload[GatewayHelloMsg]
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)
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:
fmt.Println("sending heartbeat.")
msg := GatewayPayload[any]{
Op: GATEWAY_OP_HEARTBEAT,
}
if err := d.conn.WriteJSON(msg); err != nil {
log.Fatalf("error sending heartbeat: %s\n", err)
}
}
}
}
func (d *Discord) listen(ctx context.Context) {
for {
var msg GatewayPayload[any]
if err := d.conn.ReadJSON(&msg); err != nil {
log.Fatalf("error reading message: %s\n", err)
}
select {
case <-ctx.Done():
return
default:
fmt.Printf("received message: %+v\n", msg)
if msg.EventName == "MESSAGE_CREATE" {
event := msg.Data.(map[string]interface{})
if event["content"] == "ping" {
fmt.Println("got ping, sending pong...")
if err := d.rest.SendMessage(Snowflake(event["channel_id"].(string)), "pong"); err != nil {
log.Fatalf("error sending message: %s\n", err)
}
}
}
}
}
}
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[GatewayReadyMsg]
if err := d.conn.ReadJSON(&res); err != nil {
return err
}
fmt.Printf("identify response payload: %+v\n", 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
}
|
