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/
ratelimit.go
81 lines (69 loc) · 2.23 KB
/
ratelimit.go
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/*
Copyright 2015 Franc[e]sco (lolisamurai@tfwno.gf)
This file is part of Shigebot.
Shigebot is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Shigebot is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Shigebot. If not, see <http://www.gnu.org/licenses/>.
*/
package shige
import (
"fmt"
"time"
)
const (
period = 30
userMessageLimit = 19
modMessageLimit = 99
)
type rateLimiter struct {
messageCounter int
lastMessageCountReset int64
messageLimit int
}
func (b *Bot) initRateLimiter() {
b.rateLimiter = make(chan *rateLimiter, 1)
rl := &rateLimiter{0, 0, userMessageLimit}
if b.isMod {
rl.messageLimit = modMessageLimit
}
b.rateLimiter <- rl
fmt.Printf("> Initialized rate limiter with msglimit=%d\n", rl.messageLimit)
}
// Privmsgf formats and sends a rate-limited message to channel.
func (b Bot) Privmsgf(channel, format string, args ...interface{}) {
rl := <-b.rateLimiter
defer func() { b.rateLimiter <- rl }()
now := time.Now().Unix()
if rl.lastMessageCountReset == 0 ||
now-rl.lastMessageCountReset > period {
fmt.Printf("> Rate limiter: %d messages sent in %d seconds "+
"(limit is %d msgs / %d seconds).\n",
rl.messageCounter, now-rl.lastMessageCountReset,
rl.messageLimit, period)
rl.lastMessageCountReset = now
rl.messageCounter = 0
}
if rl.messageCounter >= rl.messageLimit {
go func() {
difference := now - rl.lastMessageCountReset
amount := time.Second*period -
time.Duration(int64(time.Second)*difference) +
time.Millisecond*500
fmt.Println("!! Rate limit reached, postponing this message by",
amount)
<-time.After(amount)
fmt.Println("Sending delayed message")
b.Privmsgf(channel, format, args...)
}()
return
}
b.irc.Privmsgf(channel, fmt.Sprintf("%s %s", format, b.randStr()), args...)
rl.messageCounter++
}