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80 lines
1.8 KiB
80 lines
1.8 KiB
/*
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* MinIO Cloud Storage, (C) 2020 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 cmd
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import (
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"net/http"
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"sync"
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"time"
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)
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type apiThrottling struct {
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mu sync.RWMutex
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enabled bool
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requestsDeadline time.Duration
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requestsPool chan struct{}
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}
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func (t *apiThrottling) init(max int, deadline time.Duration) {
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if max <= 0 {
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return
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}
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t.mu.Lock()
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defer t.mu.Unlock()
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t.requestsPool = make(chan struct{}, max)
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t.requestsDeadline = deadline
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t.enabled = true
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}
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func (t *apiThrottling) get() (chan struct{}, <-chan time.Time) {
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t.mu.RLock()
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defer t.mu.RUnlock()
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if !t.enabled {
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return nil, nil
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}
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return t.requestsPool, time.NewTimer(t.requestsDeadline).C
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}
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// maxClients throttles the S3 API calls
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func maxClients(f http.HandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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pool, deadlineTimer := globalAPIThrottling.get()
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if pool == nil {
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f.ServeHTTP(w, r)
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return
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}
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select {
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case pool <- struct{}{}:
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defer func() { <-pool }()
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f.ServeHTTP(w, r)
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case <-deadlineTimer:
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// Send a http timeout message
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writeErrorResponse(r.Context(), w,
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errorCodes.ToAPIErr(ErrOperationMaxedOut),
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r.URL, guessIsBrowserReq(r))
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return
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case <-r.Context().Done():
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return
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}
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}
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}
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