126 lines
3.1 KiB
Go
126 lines
3.1 KiB
Go
/*
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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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"github.com/minio/minio/cmd/config/api"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/sys"
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)
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type apiConfig struct {
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mu sync.RWMutex
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requestsDeadline time.Duration
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requestsPool chan struct{}
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clusterDeadline time.Duration
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corsAllowOrigins []string
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}
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func (t *apiConfig) init(cfg api.Config, setDriveCount int) {
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t.mu.Lock()
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defer t.mu.Unlock()
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t.clusterDeadline = cfg.ClusterDeadline
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t.corsAllowOrigins = cfg.CorsAllowOrigin
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var apiRequestsMaxPerNode int
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if cfg.RequestsMax <= 0 {
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stats, err := sys.GetStats()
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if err != nil {
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logger.LogIf(GlobalContext, err)
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// Default to 8 GiB, not critical.
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stats.TotalRAM = 8 << 30
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}
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// max requests per node is calculated as
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// total_ram / ram_per_request
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// ram_per_request is 4MiB * setDriveCount + (2 * 10MiB (v1 erasure block size) + 2 * 1MiB (v2 erasure block size)
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apiRequestsMaxPerNode = int(stats.TotalRAM / uint64(setDriveCount*readBlockSize+int(blockSizeV1*2+blockSizeV2*2)))
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} else {
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apiRequestsMaxPerNode = cfg.RequestsMax
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if len(globalEndpoints.Hostnames()) > 0 {
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apiRequestsMaxPerNode /= len(globalEndpoints.Hostnames())
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}
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}
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t.requestsPool = make(chan struct{}, apiRequestsMaxPerNode)
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t.requestsDeadline = cfg.RequestsDeadline
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}
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func (t *apiConfig) getCorsAllowOrigins() []string {
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t.mu.RLock()
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defer t.mu.RUnlock()
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corsAllowOrigins := make([]string, len(t.corsAllowOrigins))
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copy(corsAllowOrigins, t.corsAllowOrigins)
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return corsAllowOrigins
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}
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func (t *apiConfig) getClusterDeadline() time.Duration {
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t.mu.RLock()
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defer t.mu.RUnlock()
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if t.clusterDeadline == 0 {
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return 10 * time.Second
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}
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return t.clusterDeadline
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}
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func (t *apiConfig) getRequestsPool() (chan struct{}, time.Duration) {
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t.mu.RLock()
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defer t.mu.RUnlock()
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if t.requestsPool == nil {
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return nil, time.Duration(0)
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}
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return t.requestsPool, t.requestsDeadline
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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, deadline := globalAPIConfig.getRequestsPool()
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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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deadlineTimer := time.NewTimer(deadline)
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defer deadlineTimer.Stop()
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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.C:
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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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