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minio/cmd/throttling.go

80 lines
1.8 KiB

/*
* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"net/http"
"sync"
"time"
)
type apiThrottling struct {
mu sync.RWMutex
enabled bool
requestsDeadline time.Duration
requestsPool chan struct{}
}
func (t *apiThrottling) init(max int, deadline time.Duration) {
if max <= 0 {
return
}
t.mu.Lock()
defer t.mu.Unlock()
t.requestsPool = make(chan struct{}, max)
t.requestsDeadline = deadline
t.enabled = true
}
func (t *apiThrottling) get() (chan struct{}, <-chan time.Time) {
t.mu.RLock()
defer t.mu.RUnlock()
if !t.enabled {
return nil, nil
}
return t.requestsPool, time.NewTimer(t.requestsDeadline).C
}
// maxClients throttles the S3 API calls
func maxClients(f http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
pool, deadlineTimer := globalAPIThrottling.get()
if pool == nil {
f.ServeHTTP(w, r)
return
}
select {
case pool <- struct{}{}:
defer func() { <-pool }()
f.ServeHTTP(w, r)
case <-deadlineTimer:
// Send a http timeout message
writeErrorResponse(r.Context(), w,
errorCodes.ToAPIErr(ErrOperationMaxedOut),
r.URL, guessIsBrowserReq(r))
return
case <-r.Context().Done():
return
}
}
}