97 lines
2.3 KiB
Go
97 lines
2.3 KiB
Go
/*
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* Minimalist Object Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package quota
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import (
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"encoding/binary"
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"net"
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"sync"
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"time"
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)
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// map[minute][address] = current quota
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type quotaMap struct {
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sync.RWMutex
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data map[int64]map[uint32]int64
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limit int64
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duration time.Duration
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segmentSize time.Duration
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}
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func (q *quotaMap) CanExpire() {
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q.Lock()
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defer q.Unlock()
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currentMinute := time.Now().UTC().UnixNano() / q.segmentSize.Nanoseconds()
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// divide by segmentSize, otherwise expiredQuotas will always be negative
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expiredQuotas := currentMinute - (q.duration.Nanoseconds() / q.segmentSize.Nanoseconds())
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for time := range q.data {
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if time < expiredQuotas {
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delete(q.data, time)
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}
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}
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}
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func (q *quotaMap) Add(ip uint32, size int64) {
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q.CanExpire()
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q.Lock()
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defer q.Unlock()
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currentMinute := time.Now().UTC().UnixNano() / q.segmentSize.Nanoseconds()
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if _, ok := q.data[currentMinute]; !ok {
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q.data[currentMinute] = make(map[uint32]int64)
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}
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currentData, _ := q.data[currentMinute][ip]
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proposedDataSize := currentData + size
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q.data[currentMinute][ip] = proposedDataSize
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}
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func (q *quotaMap) IsQuotaMet(ip uint32) bool {
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q.CanExpire()
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if q.GetQuotaUsed(ip) >= q.limit {
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return true
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}
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return false
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}
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func (q *quotaMap) GetQuotaUsed(ip uint32) (total int64) {
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q.CanExpire()
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q.RLock()
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defer q.RUnlock()
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for _, segment := range q.data {
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if used, ok := segment[ip]; ok {
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total += used
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}
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}
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return
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}
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func (q *quotaMap) WillExceedQuota(ip uint32, size int64) (result bool) {
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return q.GetQuotaUsed(ip)+size > q.limit
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}
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type longIP struct {
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net.IP
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}
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// []byte to uint32 representation
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func (p longIP) IptoUint32() (result uint32) {
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ip := p.To4()
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if ip == nil {
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return 0
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}
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return binary.BigEndian.Uint32(ip)
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}
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