/
discord.go
145 lines (131 loc) · 3.26 KB
/
discord.go
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package maleodiscord
import (
"context"
"math/rand"
"net/http"
"runtime"
"sync"
"sync/atomic"
"time"
"github.com/bwmarrin/snowflake"
"github.com/tigorlazuardi/maleo"
"github.com/tigorlazuardi/maleo/bucket"
"github.com/tigorlazuardi/maleo/locker"
"github.com/tigorlazuardi/maleo/queue"
)
func init() {
snowflake.Epoch = 1420070400000 // discord epoch
}
type Discord struct {
name string
webhook string
lock locker.Locker
queue *queue.Queue[*Job]
sem chan struct{}
working int32
trace maleo.TraceCapturer
builder EmbedBuilder
bucket bucket.Bucket
globalKey string
cooldown time.Duration
snowflake *snowflake.Node
client Client
hook Hook
dataEncoder DataEncoder
codeBlockBuilder CodeBlockBuilder
outgoing *sync.WaitGroup
}
// Name implements maleo.Messenger interface.
func (d *Discord) Name() string {
if d.name == "" {
return "discord"
}
return d.name
}
// SendMessage implements maleo.Messenger interface.
func (d *Discord) SendMessage(ctx context.Context, msg maleo.MessageContext) {
d.queue.Enqueue(NewJob(ctx, msg))
d.work()
}
// Wait implements maleo.Messenger interface.
func (d *Discord) Wait(ctx context.Context) error {
sig := make(chan struct{})
go func() {
d.outgoing.Wait()
close(sig)
}()
select {
case <-ctx.Done():
return ctx.Err()
case <-sig:
return nil
}
}
func (d *Discord) work() {
if atomic.CompareAndSwapInt32(&d.working, 0, 1) {
// We need at add one point synchronously to ensure .Wait works as intended, no matter the CPU.
d.outgoing.Add(1)
go func() {
for d.queue.HasNext() {
d.outgoing.Add(1)
d.sem <- struct{}{}
kv := d.queue.Dequeue()
go func() {
ctx := maleo.DetachedContext(kv.Context)
d.send(ctx, kv.Message)
<-d.sem
d.outgoing.Done()
}()
}
atomic.StoreInt32(&d.working, 0)
d.outgoing.Done()
}()
}
}
type Client interface {
Do(*http.Request) (*http.Response, error)
}
type Job struct {
Context context.Context
Message maleo.MessageContext
}
func NewJob(ctx context.Context, message maleo.MessageContext) *Job {
return &Job{Context: ctx, Message: message}
}
// NewDiscordBot creates a new discord bot.
func NewDiscordBot(webhook string, opts ...DiscordOption) *Discord {
d := &Discord{
name: "discord",
webhook: webhook,
lock: locker.NewLocalLock(),
queue: queue.New[*Job](500),
sem: make(chan struct{}, (runtime.NumCPU()/3)+2),
trace: maleo.NoopTraceCapturer{},
globalKey: "global",
cooldown: time.Minute * 15,
snowflake: generateSnowflakeNode(),
client: http.DefaultClient,
hook: NoopHook{},
dataEncoder: JSONDataEncoder{},
codeBlockBuilder: JSONCodeBlockBuilder{},
outgoing: &sync.WaitGroup{},
}
d.builder = EmbedBuilderFunc(d.defaultEmbedBuilder)
for _, opt := range opts {
opt.apply(d)
}
return d
}
func generateSnowflakeNode() *snowflake.Node {
source := rand.NewSource(time.Now().UnixNano())
id := source.Int63()
high := source.Int63()
for high > 1023 {
high >>= 1
}
for id > high {
id >>= 1
}
node, _ := snowflake.NewNode(id)
return node
}