canopeas/discord/utils.go

package discord

import (
	r "math/rand"
	"net/http"
	"time"

	"git.birbmc.com/canopeas/database"

	"git.birbmc.com/Etzelia/go-serverapi"
	"go.jolheiser.com/beaver"
)

type rateLimit struct {
	rate time.Duration
	next time.Time
}

func NewRateLimit(rate time.Duration) *rateLimit {
	return &rateLimit{
		rate: rate,
		next: time.Now(),
	}
}

func (r *rateLimit) Try() bool {
	now := time.Now()
	if now.After(r.next) {
		r.next = now.Add(r.rate)
		return true
	}
	return false
}

var rand = r.New(r.NewSource(time.Now().Unix()))

func random(list []string) string {
	size := len(list)
	if size == 0 {
		return ""
	} else if size == 1 {
		return list[0]
	}
	idx := rand.Intn(size)
	return list[idx]
}

type unbanSchedule struct {
	db   *database.Database
	sapi *serverapi.Client
}

func (u *unbanSchedule) Run() {
	u.check()
	ticker := time.NewTicker(time.Minute * 5)
	for {
		<-ticker.C
		u.check()
	}
}

func (u *unbanSchedule) check() {
	beaver.Debug("Running unban schedule")
	now := time.Now()
	for _, record := range u.db.ListUnbans() {
		if now.After(record.Expiration) {
			beaver.Infof("Unbanning %s", record.Username)
			unban := serverapi.Unban{
				Target: record.Username,
			}
			status, err := u.sapi.Unban(unban)
			if err != nil {
				beaver.Error(err)
			}
			if status != http.StatusOK {
				beaver.Errorf("ServerAPI returned status %d when trying to ban %s", status, record.Username)
			}
			if err := u.db.RemoveUnban(record.Username); err != nil {
				beaver.Errorf("could not remove unban for %s in database", record.Username)
			}
		}
	}
}