mirror of https://github.com/goharbor/harbor.git
63 lines
1.3 KiB
Go
63 lines
1.3 KiB
Go
// Copyright Project Harbor Authors
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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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package transfer
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import (
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"fmt"
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"io"
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"time"
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"golang.org/x/time/rate"
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)
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type reader struct {
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reader io.ReadCloser
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limiter *rate.Limiter
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}
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type RateOpts struct {
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Rate float64
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}
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const KBRATE = 1024 / 8
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// NewReader returns a Reader that is rate limited
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func NewReader(r io.ReadCloser, kb int32) io.ReadCloser {
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l := rate.NewLimiter(rate.Limit(kb*KBRATE), 1000*1024)
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return &reader{
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reader: r,
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limiter: l,
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}
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}
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func (r *reader) Read(buf []byte) (int, error) {
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n, err := r.reader.Read(buf)
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if n <= 0 {
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return n, err
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}
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now := time.Now()
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rv := r.limiter.ReserveN(now, n)
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if !rv.OK() {
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return 0, fmt.Errorf("exceeds limiter's burst")
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}
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delay := rv.DelayFrom(now)
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time.Sleep(delay)
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return n, err
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}
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func (r *reader) Close() error {
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return r.reader.Close()
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}
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