forked from Silverfish/proton-bridge
b15d22c8cc
* [x] expononential cooldown of retries * [x] do not trigger sync by counts * [x] randomization of event poll interval
66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
// Copyright (c) 2020 Proton Technologies AG
|
|
//
|
|
// This file is part of ProtonMail Bridge.
|
|
//
|
|
// ProtonMail Bridge 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.
|
|
//
|
|
// ProtonMail Bridge 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 ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
package store
|
|
|
|
import "time"
|
|
|
|
type cooldown struct {
|
|
waitTimes []time.Duration
|
|
waitIndex int
|
|
lastTry time.Time
|
|
}
|
|
|
|
func (c *cooldown) setExponentialWait(initial time.Duration, base int, maximum time.Duration) {
|
|
waitTimes := []time.Duration{}
|
|
t := initial
|
|
if base > 1 {
|
|
for t < maximum {
|
|
waitTimes = append(waitTimes, t)
|
|
t *= time.Duration(base)
|
|
}
|
|
}
|
|
waitTimes = append(waitTimes, maximum)
|
|
c.setWaitTimes(waitTimes...)
|
|
}
|
|
|
|
func (c *cooldown) setWaitTimes(newTimes ...time.Duration) {
|
|
c.waitTimes = newTimes
|
|
c.reset()
|
|
}
|
|
|
|
// isTooSoon™ returns whether the cooldown period is not yet over.
|
|
func (c *cooldown) isTooSoon() bool {
|
|
if time.Since(c.lastTry) < c.waitTimes[c.waitIndex] {
|
|
return true
|
|
}
|
|
c.lastTry = time.Now()
|
|
return false
|
|
}
|
|
|
|
func (c *cooldown) increaseWaitTime() {
|
|
c.lastTry = time.Now()
|
|
if c.waitIndex+1 < len(c.waitTimes) {
|
|
c.waitIndex++
|
|
}
|
|
}
|
|
|
|
func (c *cooldown) reset() {
|
|
c.waitIndex = 0
|
|
c.lastTry = time.Time{}
|
|
}
|