92 lines
2.4 KiB
Go
92 lines
2.4 KiB
Go
/*
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* Copyright 2020 The Dragonfly 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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*/
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package limitreader
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import (
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"fmt"
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"hash"
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"io"
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"github.com/opencontainers/go-digest"
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"d7y.io/dragonfly/v2/pkg/ratelimiter/ratelimiter"
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"d7y.io/dragonfly/v2/pkg/util/digestutils"
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)
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// NewLimitReader creates a LimitReader.
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// src: reader
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// rate: bytes/second
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func NewLimitReader(src io.Reader, rate int64) *LimitReader {
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return NewLimitReaderWithLimiter(newRateLimiterWithDefaultWindow(rate), src)
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}
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// NewLimitReaderWithLimiter creates LimitReader with a rateLimiter.
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// src: reader
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// rate: bytes/second
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func NewLimitReaderWithLimiter(rl *ratelimiter.RateLimiter, src io.Reader) *LimitReader {
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return &LimitReader{
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Src: src,
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Limiter: rl,
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}
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}
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func newRateLimiterWithDefaultWindow(rate int64) *ratelimiter.RateLimiter {
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return ratelimiter.NewRateLimiter(ratelimiter.TransRate(rate), 2)
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}
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// LimitReader reads stream with RateLimiter.
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type LimitReader struct {
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Src io.Reader
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Limiter *ratelimiter.RateLimiter
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digest hash.Hash
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digestType string
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}
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func (lr *LimitReader) Read(p []byte) (n int, err error) {
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n, e := lr.Src.Read(p)
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if e != nil && e != io.EOF {
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return n, e
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}
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if n > 0 {
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if lr.digest != nil {
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lr.digest.Write(p[:n])
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}
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lr.Limiter.AcquireBlocking(int64(n))
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}
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return n, e
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}
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// NewLimitReaderWithLimiterAndDigest creates LimitReader with rateLimiter and digest.
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// src: reader
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// rate: bytes/second
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func NewLimitReaderWithLimiterAndDigest(src io.Reader, rl *ratelimiter.RateLimiter, digest hash.Hash, digestType digest.Algorithm) *LimitReader {
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return &LimitReader{
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Src: src,
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Limiter: rl,
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digest: digest,
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digestType: digestType.String(),
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}
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}
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// Digest calculates the digest of all contents read, return value is like <algo>:<hex_value>
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func (lr *LimitReader) Digest() string {
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if lr.digest != nil {
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return fmt.Sprintf("%s:%s", lr.digestType, digestutils.ToHashString(lr.digest))
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}
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return ""
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}
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