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limiter.go
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/
limiter.go
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/*
*
* k6 - a next-generation load testing tool
* Copyright (C) 2017 Load Impact
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package http
type SlotLimiter struct {
ch chan struct{}
}
func NewSlotLimiter(slots int) SlotLimiter {
if slots <= 0 {
return SlotLimiter{nil}
}
ch := make(chan struct{}, slots)
for i := 0; i < slots; i++ {
ch <- struct{}{}
}
return SlotLimiter{ch}
}
func (l *SlotLimiter) Begin() {
if l.ch != nil {
<-l.ch
}
}
func (l *SlotLimiter) End() {
if l.ch != nil {
l.ch <- struct{}{}
}
}
type MultiSlotLimiter struct {
m map[string]*SlotLimiter
slots int
}
func NewMultiSlotLimiter(slots int) MultiSlotLimiter {
return MultiSlotLimiter{make(map[string]*SlotLimiter), slots}
}
func (l *MultiSlotLimiter) Slot(s string) *SlotLimiter {
if l.slots == 0 {
return nil
}
ll, ok := l.m[s]
if !ok {
tmp := NewSlotLimiter(l.slots)
ll = &tmp
l.m[s] = ll
}
return ll
}