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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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