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51 lines
1.1 KiB
51 lines
1.1 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 Reader struct { |
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r io.Reader |
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limiter *rate.Limiter |
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} |
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func NewReader(r io.Reader, limiter *rate.Limiter) *Reader { |
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return &Reader{ |
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r: r, |
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limiter: limiter, |
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} |
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} |
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func (r *Reader) Read(p []byte) (n int, err error) { |
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b := r.limiter.Burst() |
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if b < len(p) { |
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p = p[:b] |
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} |
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n, err = r.r.Read(p) |
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if err != nil { |
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return |
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} |
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err = r.limiter.WaitN(context.Background(), n) |
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if err != nil { |
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return |
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} |
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return |
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}
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