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114 lines
2.8 KiB
114 lines
2.8 KiB
/*
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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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"net"
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"net/http"
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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]uint64
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limit uint64
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duration int64
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}
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func (q *quotaMap) Add(ip uint32, size uint64) bool {
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q.Lock()
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defer q.Unlock()
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currentMinute := time.Now().Unix() / q.duration
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expiredQuotas := (time.Now().Unix() / q.duration) - 5
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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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if _, ok := q.data[currentMinute]; !ok {
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q.data[currentMinute] = make(map[uint32]uint64)
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}
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currentData, _ := q.data[currentMinute][ip]
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proposedDataSize := currentData + size
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if proposedDataSize > q.limit {
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return false
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}
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q.data[currentMinute][ip] = proposedDataSize
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return true
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}
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// HttpQuotaHandler
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type httpQuotaHandler struct {
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handler http.Handler
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quotas *quotaMap
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adder func(uint64) uint64
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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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q0 := uint32(ip[0]) << 24
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q1 := uint32(ip[1]) << 16
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q2 := uint32(ip[2]) << 8
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q3 := uint32(ip[3])
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result = q0 + q1 + q2 + q3
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return
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}
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// ServeHTTP is an http.Handler ServeHTTP method
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func (h *httpQuotaHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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host, _, _ := net.SplitHostPort(req.RemoteAddr)
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longIP := longIP{net.ParseIP(host)}.IptoUint32()
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if h.quotas.Add(longIP, h.adder(uint64(req.ContentLength))) {
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h.handler.ServeHTTP(w, req)
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}
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}
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// BandwidthCap sets a quote based upon bandwidth used
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func BandwidthCap(h http.Handler, limit int64) http.Handler {
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return &httpQuotaHandler{
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handler: h,
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quotas: "aMap{
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data: make(map[int64]map[uint32]uint64),
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limit: uint64(limit),
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duration: int64(60),
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},
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adder: func(count uint64) uint64 { return count },
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}
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}
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// RequestLimit sets a quota based upon request count
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func RequestLimit(h http.Handler, limit int64) http.Handler {
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return &httpQuotaHandler{
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handler: h,
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quotas: "aMap{
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data: make(map[int64]map[uint32]uint64),
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limit: uint64(limit),
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duration: int64(60),
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},
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adder: func(count uint64) uint64 { return 1 },
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}
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}
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