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61 lines
1.2 KiB
61 lines
1.2 KiB
// Copyright 2019 fatedier, fatedier@gmail.com
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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 limit
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import (
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"context"
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"io"
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"golang.org/x/time/rate"
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)
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type Writer struct {
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w io.Writer
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limiter *rate.Limiter
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}
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func NewWriter(w io.Writer, limiter *rate.Limiter) *Writer {
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return &Writer{
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w: w,
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limiter: limiter,
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}
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}
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func (w *Writer) Write(p []byte) (n int, err error) {
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var nn int
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b := w.limiter.Burst()
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for {
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end := len(p)
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if end == 0 {
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break
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}
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if b < len(p) {
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end = b
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}
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err = w.limiter.WaitN(context.Background(), end)
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if err != nil {
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return
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}
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nn, err = w.w.Write(p[:end])
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n += nn
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if err != nil {
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return
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}
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p = p[end:]
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}
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return
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}
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