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62 lines
2.4 KiB
Go
62 lines
2.4 KiB
Go
/*
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*
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* Copyright 2017 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Package encoding defines the interface for the compressor and the functions
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// to register and get the compossor.
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// This package is EXPERIMENTAL.
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package encoding
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import (
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"io"
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)
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var registerCompressor = make(map[string]Compressor)
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// Compressor is used for compressing and decompressing when sending or receiving messages.
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type Compressor interface {
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// Compress writes the data written to wc to w after compressing it. If an error
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// occurs while initializing the compressor, that error is returned instead.
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Compress(w io.Writer) (io.WriteCloser, error)
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// Decompress reads data from r, decompresses it, and provides the uncompressed data
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// via the returned io.Reader. If an error occurs while initializing the decompressor, that error
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// is returned instead.
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Decompress(r io.Reader) (io.Reader, error)
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// Name is the name of the compression codec and is used to set the content coding header.
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Name() string
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}
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// RegisterCompressor registers the compressor with gRPC by its name. It can be activated when
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// sending an RPC via grpc.UseCompressor(). It will be automatically accessed when receiving a
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// message based on the content coding header. Servers also use it to send a response with the
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// same encoding as the request.
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//
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// NOTE: this function must only be called during initialization time (i.e. in an init() function). If
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// multiple Compressors are registered with the same name, the one registered last will take effect.
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func RegisterCompressor(c Compressor) {
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registerCompressor[c.Name()] = c
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}
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// GetCompressor returns Compressor for the given compressor name.
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func GetCompressor(name string) Compressor {
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return registerCompressor[name]
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}
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// Identity specifies the optional encoding for uncompressed streams.
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// It is intended for grpc internal use only.
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const Identity = "identity"
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