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refine handling for empty read

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This commit is contained in:
Darien Raymond 2018-03-29 18:15:50 +02:00
parent babd0107cf
commit bb46a96f04
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GPG Key ID: 7251FFA14BB18169
1 changed files with 26 additions and 18 deletions
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44
common/buf/reader.go
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@ -23,7 +23,7 @@ const xlSize = 128 * 1024
func (r *BytesToBufferReader) readSmall() (MultiBuffer, error) {
b := New()
for {
for i := 0; i < 64; i++ {
err := b.Reset(ReadFrom(r.Reader))
if b.IsFull() {
r.buffer = newBytes(Size + 1)
@ -36,6 +36,13 @@ func (r *BytesToBufferReader) readSmall() (MultiBuffer, error) {
return nil, err
}
}
return nil, newError("Reader returns too many empty payloads.")
}
func (r *BytesToBufferReader) freeBuffer() {
freeBytes(r.buffer)
r.buffer = nil
}
// ReadMultiBuffer implements Reader.
@ -44,26 +51,27 @@ func (r *BytesToBufferReader) ReadMultiBuffer() (MultiBuffer, error) {
return r.readSmall()
}
for {
nBytes, err := r.Reader.Read(r.buffer)
if nBytes > 0 {
mb := NewMultiBufferCap(nBytes/Size + 1)
mb.Write(r.buffer[:nBytes])
if nBytes == len(r.buffer) && nBytes < xlSize {
freeBytes(r.buffer)
r.buffer = newBytes(uint32(nBytes) + 1)
} else if nBytes < Size {
freeBytes(r.buffer)
r.buffer = nil
}
return mb, nil
}
if err != nil {
nBytes, err := r.Reader.Read(r.buffer)
if nBytes > 0 {
mb := NewMultiBufferCap(nBytes/Size + 1)
mb.Write(r.buffer[:nBytes])
if nBytes == len(r.buffer) && nBytes < xlSize {
freeBytes(r.buffer)
r.buffer = nil
return nil, err
r.buffer = newBytes(uint32(nBytes) + 1)
} else if nBytes < Size {
r.freeBuffer()
}
return mb, nil
}
r.freeBuffer()
if err != nil {
return nil, err
}
// Read() returns empty payload and nil err. We don't expect this to happen, but just in case.
return r.readSmall()
}
// BufferedReader is a Reader that keeps its internal buffer.