mirror of
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107 lines
2.6 KiB
Go
107 lines
2.6 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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"errors"
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"github.com/minio-io/minio/pkg/iodine"
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"io"
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"net"
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"net/http"
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"time"
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)
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// bandwidthQuotaHandler
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type bandwidthQuotaHandler struct {
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handler http.Handler
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quotas *quotaMap
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}
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// ServeHTTP is an http.Handler ServeHTTP method
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func (h *bandwidthQuotaHandler) 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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req.Body = quotaReader{
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ReadCloser: req.Body,
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quotas: h.quotas,
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ip: longIP,
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}
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w = quotaWriter{
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ResponseWriter: w,
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quotas: h.quotas,
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ip: longIP,
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}
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h.handler.ServeHTTP(w, req)
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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, duration time.Duration) http.Handler {
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return &bandwidthQuotaHandler{
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handler: h,
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quotas: "aMap{
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data: make(map[int64]map[uint32]int64),
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limit: int64(limit),
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duration: duration,
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segmentSize: segmentSize(duration),
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},
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}
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}
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type quotaReader struct {
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io.ReadCloser
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quotas *quotaMap
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ip uint32
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}
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func (q quotaReader) Read(b []byte) (int, error) {
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if q.quotas.IsQuotaMet(q.ip) {
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return 0, iodine.New(errors.New("Quota Met"), nil)
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}
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n, err := q.ReadCloser.Read(b)
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q.quotas.Add(q.ip, int64(n))
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return n, iodine.New(err, nil)
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}
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func (q quotaReader) Close() error {
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return iodine.New(q.ReadCloser.Close(), nil)
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}
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type quotaWriter struct {
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http.ResponseWriter
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quotas *quotaMap
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ip uint32
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}
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func (q quotaWriter) Write(b []byte) (int, error) {
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if q.quotas.IsQuotaMet(q.ip) {
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return 0, iodine.New(errors.New("Quota Met"), nil)
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}
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q.quotas.Add(q.ip, int64(len(b)))
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n, err := q.ResponseWriter.Write(b)
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// remove from quota if a full write isn't performed
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q.quotas.Add(q.ip, int64(n-len(b)))
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return n, iodine.New(err, nil)
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}
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func segmentSize(duration time.Duration) time.Duration {
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var segmentSize time.Duration
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for i := int64(1); i < duration.Nanoseconds(); i = i * 10 {
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segmentSize = time.Duration(i)
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}
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return segmentSize
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}
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