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limiter.go
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limiter.go
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// Copyright (c) 2015-2022 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// Package limiter implements throughput upload and download limits via http.RoundTripper
package limiter
import (
"errors"
"io"
"net/http"
"github.com/juju/ratelimit"
)
type limiter struct {
upload *ratelimit.Bucket
download *ratelimit.Bucket
transport http.RoundTripper // HTTP transport that needs to be intercepted
}
func (l limiter) limitReader(r io.Reader, b *ratelimit.Bucket) io.Reader {
if b == nil {
return r
}
return ratelimit.Reader(r, b)
}
// RoundTrip executes user provided request and response hooks for each HTTP call.
func (l limiter) RoundTrip(req *http.Request) (res *http.Response, err error) {
if l.transport == nil {
return nil, errors.New("Invalid Argument")
}
type readCloser struct {
io.Reader
io.Closer
}
if req.Body != nil {
req.Body = &readCloser{
Reader: l.limitReader(req.Body, l.upload),
Closer: req.Body,
}
}
res, err = l.transport.RoundTrip(req)
if res != nil && res.Body != nil {
res.Body = &readCloser{
Reader: l.limitReader(res.Body, l.download),
Closer: res.Body,
}
}
return res, err
}
// New return a ratelimited transport
func New(uploadLimit, downloadLimit int64, transport http.RoundTripper) http.RoundTripper {
if uploadLimit == 0 && downloadLimit == 0 {
return transport
}
var (
uploadBucket *ratelimit.Bucket
downloadBucket *ratelimit.Bucket
)
if uploadLimit > 0 {
uploadBucket = ratelimit.NewBucketWithRate(float64(uploadLimit), uploadLimit)
}
if downloadLimit > 0 {
downloadBucket = ratelimit.NewBucketWithRate(float64(downloadLimit), downloadLimit)
}
return &limiter{
upload: uploadBucket,
download: downloadBucket,
transport: transport,
}
}