minio/cmd/handler-api.go

108 lines
2.4 KiB
Go

/*
* 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"
"github.com/minio/minio/cmd/config/api"
)
type apiConfig struct {
mu sync.RWMutex
requestsDeadline time.Duration
requestsPool chan struct{}
readyDeadline time.Duration
corsAllowOrigins []string
}
func (t *apiConfig) init(cfg api.Config) {
t.mu.Lock()
defer t.mu.Unlock()
t.readyDeadline = cfg.APIReadyDeadline
t.corsAllowOrigins = cfg.APICorsAllowOrigin
if cfg.APIRequestsMax <= 0 {
return
}
apiRequestsMax := cfg.APIRequestsMax
if len(globalEndpoints.Hostnames()) > 0 {
apiRequestsMax /= len(globalEndpoints.Hostnames())
}
t.requestsPool = make(chan struct{}, apiRequestsMax)
t.requestsDeadline = cfg.APIRequestsDeadline
}
func (t *apiConfig) getCorsAllowOrigins() []string {
t.mu.RLock()
defer t.mu.RUnlock()
return t.corsAllowOrigins
}
func (t *apiConfig) getReadyDeadline() time.Duration {
t.mu.RLock()
defer t.mu.RUnlock()
if t.readyDeadline == 0 {
return 10 * time.Second
}
return t.readyDeadline
}
func (t *apiConfig) getRequestsPool() (chan struct{}, <-chan time.Time) {
t.mu.RLock()
defer t.mu.RUnlock()
if t.requestsPool == nil {
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 := globalAPIConfig.getRequestsPool()
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
}
}
}