/
grpc.go
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/
grpc.go
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// Copyright (c) 2021 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// Package yarpcgrpccompressor provides an adapter for YARPC compressors to
// gRPC compressors.
//
// The only distinction is that YARPC's Decompressor returns an io.ReadCloser
// instead of a mere io.Reader.
// gRPC does not call Close, so must infer the end of stream by returning the
// reader to the reader pool when Read returns io.EOF.
// This wrapper uses the io.EOF to trigger and automatic Close.
package yarpcgrpccompressor
import (
"io"
"go.uber.org/yarpc/api/transport"
"google.golang.org/grpc/encoding"
)
// New adapts a YARPC compressor to a gRPC compressor.
func New(compressor transport.Compressor) encoding.Compressor {
return &Compressor{compressor: compressor}
}
// Compressor is a gRPC compressor that wraps a YARPC compressor.
type Compressor struct {
compressor transport.Compressor
}
var _ encoding.Compressor = (*Compressor)(nil)
// Name returns the name of the underlying compressor.
func (c *Compressor) Name() string {
return c.compressor.Name()
}
// Compress wraps a writer with a compressing writer.
func (c *Compressor) Compress(w io.Writer) (io.WriteCloser, error) {
return c.compressor.Compress(w)
}
// Decompress wraps a reader with a decompressing reader.
func (c *Compressor) Decompress(r io.Reader) (io.Reader, error) {
dr, err := c.compressor.Decompress(r)
if err != nil {
return nil, err
}
return &reader{reader: dr}, nil
}
type reader struct {
reader io.ReadCloser
}
var _ io.Reader = (*reader)(nil)
func (r *reader) Read(buf []byte) (n int, err error) {
n, err = r.reader.Read(buf)
if err == io.EOF {
r.reader.Close()
}
return n, err
}