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60 lines
1.2 KiB
60 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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