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arikawa/0-examples/simple/main.go
diamondburned 54cadd2f45 gateway: Refactor for a better concurrent API
This commit refactors the whole package gateway as well as utils/ws
(formerly utils/wsutil) and voice/voicegateway. The new refactor
utilizes a design pattern involving a concurrent loop and an arriving
event channel.

An additional change was made to the way gateway events are typed.
Before, pretty much any type will satisfy a gateway event type, since
the actual type was just interface{}. The new refactor defines a
concrete interface that events can implement:

    type Event interface {
        Op() OpCode
        EventType() EventType
    }

Using this interface, the user can easily add custom gateway events
independently of the library without relying on string maps. This adds a
lot of type safety into the library and makes type-switching on Event
types much more reasonable.

Gateway error callbacks are also almost entirely removed in favor of
custom gateway events. A catch-all can easily be added like this:

    s.AddHandler(func(err error) {
        log.Println("gateway error:, err")
    })
2021-12-14 13:49:34 -08:00

46 lines
957 B
Go

// Package main demonstrates a bare simple bot without a state cache. It logs
// all messages it sees into stderr.
package main
import (
"context"
"log"
"os"
"github.com/diamondburned/arikawa/v3/gateway"
"github.com/diamondburned/arikawa/v3/session"
)
// To run, do `BOT_TOKEN="TOKEN HERE" go run .`
func main() {
var token = os.Getenv("BOT_TOKEN")
if token == "" {
log.Fatalln("No $BOT_TOKEN given.")
}
s := session.New("Bot " + token)
s.AddHandler(func(c *gateway.MessageCreateEvent) {
log.Println(c.Author.Username, "sent", c.Content)
})
// Add the needed Gateway intents.
s.AddIntents(gateway.IntentGuildMessages)
s.AddIntents(gateway.IntentDirectMessages)
if err := s.Open(context.Background()); err != nil {
log.Fatalln("Failed to connect:", err)
}
defer s.Close()
u, err := s.Me()
if err != nil {
log.Fatalln("Failed to get myself:", err)
}
log.Println("Started as", u.Username)
// Block forever.
select {}
}