forked from GoogleCloudPlatform/gcsfuse
/
bucket.go
116 lines (96 loc) · 2.7 KB
/
bucket.go
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// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 main
import (
"fmt"
"time"
"golang.org/x/net/context"
"github.com/googlecloudplatform/gcsfuse/ratelimit"
"github.com/jacobsa/gcloud/gcs"
"github.com/jacobsa/gcloud/gcs/gcscaching"
"github.com/jacobsa/timeutil"
)
func setUpRateLimiting(
in gcs.Bucket,
opRateLimitHz float64,
egressBandwidthLimit float64) (out gcs.Bucket, err error) {
// If no rate limiting has been requested, just return the bucket.
if !(opRateLimitHz > 0 || egressBandwidthLimit > 0) {
out = in
return
}
// Treat a disabled limit as a very large one.
if !(opRateLimitHz > 0) {
opRateLimitHz = 1e15
}
if !(egressBandwidthLimit > 0) {
egressBandwidthLimit = 1e15
}
// Choose token bucket capacities.
const window = 30 * time.Second
opCapacity, err := ratelimit.ChooseTokenBucketCapacity(
opRateLimitHz,
window)
if err != nil {
err = fmt.Errorf("Choosing operation token bucket capacity: %v", err)
return
}
egressCapacity, err := ratelimit.ChooseTokenBucketCapacity(
egressBandwidthLimit,
window)
if err != nil {
err = fmt.Errorf("Choosing egress bandwidth token bucket capacity: %v", err)
return
}
// Create the throttles.
opThrottle := ratelimit.NewThrottle(opRateLimitHz, opCapacity)
egressThrottle := ratelimit.NewThrottle(egressBandwidthLimit, egressCapacity)
// And the bucket.
out = ratelimit.NewThrottledBucket(
opThrottle,
egressThrottle,
in)
return
}
func setUpBucket(
ctx context.Context,
flags *flagStorage,
conn gcs.Conn,
name string) (b gcs.Bucket, err error) {
// Extract the appropriate bucket.
b, err = conn.OpenBucket(ctx, name)
if err != nil {
err = fmt.Errorf("OpenBucket: %v", err)
return
}
// Enable rate limiting, if requested.
b, err = setUpRateLimiting(
b,
flags.OpRateLimitHz,
flags.EgressBandwidthLimitBytesPerSecond)
if err != nil {
err = fmt.Errorf("setUpRateLimiting: %v", err)
return
}
// Enable cached StatObject results, if appropriate.
if flags.StatCacheTTL != 0 {
const cacheCapacity = 4096
b = gcscaching.NewFastStatBucket(
flags.StatCacheTTL,
gcscaching.NewStatCache(cacheCapacity),
timeutil.RealClock(),
b)
}
return
}