/
zlib_transport.go
86 lines (75 loc) · 2.09 KB
/
zlib_transport.go
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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package thrift
import (
"compress/zlib"
"io"
"log"
)
// ZlibTransport is a Transport implementation that makes use of zlib compression.
type ZlibTransport struct {
reader io.ReadCloser
transport Transport
writer *zlib.Writer
}
// NewZlibTransport constructs a new instance of ZlibTransport
func NewZlibTransport(trans Transport, level int) (*ZlibTransport, error) {
w, err := zlib.NewWriterLevel(trans, level)
if err != nil {
log.Println(err)
return nil, err
}
return &ZlibTransport{
writer: w,
transport: trans,
}, nil
}
// Close closes the reader and writer (flushing any unwritten data) and closes
// the underlying transport.
func (z *ZlibTransport) Close() error {
if z.reader != nil {
if err := z.reader.Close(); err != nil {
return err
}
}
if err := z.writer.Close(); err != nil {
return err
}
return z.transport.Close()
}
// Flush flushes the writer and its underlying transport.
func (z *ZlibTransport) Flush() error {
if err := z.writer.Flush(); err != nil {
return err
}
return z.transport.Flush()
}
func (z *ZlibTransport) Read(p []byte) (int, error) {
if z.reader == nil {
r, err := zlib.NewReader(z.transport)
if err != nil {
return 0, NewTransportExceptionFromError(err)
}
z.reader = r
}
return z.reader.Read(p)
}
func (z *ZlibTransport) RemainingBytes() uint64 {
return UnknownRemaining // the truth is, we just don't know unless framed is used
}
func (z *ZlibTransport) Write(p []byte) (int, error) {
return z.writer.Write(p)
}