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50 lines
1.3 KiB
50 lines
1.3 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 api
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import "net/http"
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// rateLimit
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type rateLimit struct {
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handler http.Handler
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rateQueue chan bool
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}
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func (c rateLimit) Add() {
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c.rateQueue <- true // fill in the queue
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return
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}
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func (c rateLimit) Remove() {
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<-c.rateQueue // invalidate the queue, after the request is served
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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 (c rateLimit) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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c.Add() // add
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c.handler.ServeHTTP(w, req) // serve
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c.Remove() // remove
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}
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// RateLimitHandler limits the number of concurrent http requests
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func RateLimitHandler(handle http.Handler, limit int) http.Handler {
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return rateLimit{
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handler: handle,
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rateQueue: make(chan bool, limit),
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}
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}
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