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fix panic when setting rate to lower than tokens consumed last interval v2 #4

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fix panic when setting rate to lower than tokens consumed last interval v2 #4

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6 changes: 6 additions & 0 deletions iocap.go
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,9 @@ func (r *Reader) Read(p []byte) (n int, err error) {
for n < len(p) {
// Ask for enough space to fit all remaining bytes
v := r.bucket.insert(len(p) - n)
if v < 0 {
return
}

// Read from src into the byte range in p
v, err = r.src.Read(p[n : n+v])
Expand Down Expand Up @@ -81,6 +84,9 @@ func (w *Writer) Write(p []byte) (n int, err error) {
for n < len(p) {
// Ask for enough space to write p completely.
v := w.bucket.insert(len(p) - n)
if v < 0 {
return
}

// Write from the byte offset on p into the writer.
v, err = w.dst.Write(p[n : n+v])
Expand Down