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75 lines
1.7 KiB
75 lines
1.7 KiB
10 years ago
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/*
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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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)
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// requestLimitHandler
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type connLimit struct {
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sync.RWMutex
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handler http.Handler
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connections map[uint32]int
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limit int
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}
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func (c *connLimit) TestAndAdd(ip uint32) bool {
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c.Lock()
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defer c.Unlock()
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count, _ := c.connections[ip]
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if count >= c.limit {
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return false
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}
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count = count + 1
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c.connections[ip] = count
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return true
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}
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func (c *connLimit) Remove(ip uint32) {
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c.Lock()
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defer c.Unlock()
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count, _ := c.connections[ip]
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count = count - 1
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if count <= 0 {
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delete(c.connections, ip)
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return
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}
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c.connections[ip] = count
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}
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// ServeHTTP is an http.Handler ServeHTTP method
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func (c *connLimit) 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 c.TestAndAdd(longIP) {
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defer c.Remove(longIP)
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c.handler.ServeHTTP(w, req)
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}
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}
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// ConnectionLimit limits the number of concurrent connections
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func ConnectionLimit(h http.Handler, limit int) http.Handler {
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return &connLimit{
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handler: h,
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connections: make(map[uint32]int),
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limit: limit,
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}
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}
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