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// Copyright 2014 Canonical Ltd.
// Licensed under the LGPLv3 with static-linking exception.
// See LICENCE file for details.
package ratelimit
import "io"
type reader struct {
r io.Reader
bucket *Bucket
}
// Reader returns a reader that is rate limited by
// the given token bucket. Each token in the bucket
// represents one byte.
func Reader(r io.Reader, bucket *Bucket) io.Reader {
return &reader{
r: r,
bucket: bucket,
}
}
func (r *reader) Read(buf []byte) (int, error) {
n, err := r.r.Read(buf)
if n <= 0 {
return n, err
}
r.bucket.Wait(int64(n))
return n, err
}
type writer struct {
w io.Writer
bucket *Bucket
}
// Writer returns a reader that is rate limited by
// the given token bucket. Each token in the bucket
// represents one byte.
func Writer(w io.Writer, bucket *Bucket) io.Writer {
return &writer{
w: w,
bucket: bucket,
}
}
func (w *writer) Write(buf []byte) (int, error) {
w.bucket.Wait(int64(len(buf)))
return w.w.Write(buf)
}
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