mirror of https://github.com/docker/cli.git
82 lines
3.1 KiB
Go
82 lines
3.1 KiB
Go
/*
|
|
*
|
|
* Copyright 2024 gRPC authors.
|
|
*
|
|
* 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 encoding
|
|
|
|
import (
|
|
"strings"
|
|
|
|
"google.golang.org/grpc/mem"
|
|
)
|
|
|
|
// CodecV2 defines the interface gRPC uses to encode and decode messages. Note
|
|
// that implementations of this interface must be thread safe; a CodecV2's
|
|
// methods can be called from concurrent goroutines.
|
|
type CodecV2 interface {
|
|
// Marshal returns the wire format of v. The buffers in the returned
|
|
// [mem.BufferSlice] must have at least one reference each, which will be freed
|
|
// by gRPC when they are no longer needed.
|
|
Marshal(v any) (out mem.BufferSlice, err error)
|
|
// Unmarshal parses the wire format into v. Note that data will be freed as soon
|
|
// as this function returns. If the codec wishes to guarantee access to the data
|
|
// after this function, it must take its own reference that it frees when it is
|
|
// no longer needed.
|
|
Unmarshal(data mem.BufferSlice, v any) error
|
|
// Name returns the name of the Codec implementation. The returned string
|
|
// will be used as part of content type in transmission. The result must be
|
|
// static; the result cannot change between calls.
|
|
Name() string
|
|
}
|
|
|
|
// RegisterCodecV2 registers the provided CodecV2 for use with all gRPC clients and
|
|
// servers.
|
|
//
|
|
// The CodecV2 will be stored and looked up by result of its Name() method, which
|
|
// should match the content-subtype of the encoding handled by the CodecV2. This
|
|
// is case-insensitive, and is stored and looked up as lowercase. If the
|
|
// result of calling Name() is an empty string, RegisterCodecV2 will panic. See
|
|
// Content-Type on
|
|
// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests for
|
|
// more details.
|
|
//
|
|
// If both a Codec and CodecV2 are registered with the same name, the CodecV2
|
|
// will be used.
|
|
//
|
|
// NOTE: this function must only be called during initialization time (i.e. in
|
|
// an init() function), and is not thread-safe. If multiple Codecs are
|
|
// registered with the same name, the one registered last will take effect.
|
|
func RegisterCodecV2(codec CodecV2) {
|
|
if codec == nil {
|
|
panic("cannot register a nil CodecV2")
|
|
}
|
|
if codec.Name() == "" {
|
|
panic("cannot register CodecV2 with empty string result for Name()")
|
|
}
|
|
contentSubtype := strings.ToLower(codec.Name())
|
|
registeredCodecs[contentSubtype] = codec
|
|
}
|
|
|
|
// GetCodecV2 gets a registered CodecV2 by content-subtype, or nil if no CodecV2 is
|
|
// registered for the content-subtype.
|
|
//
|
|
// The content-subtype is expected to be lowercase.
|
|
func GetCodecV2(contentSubtype string) CodecV2 {
|
|
c, _ := registeredCodecs[contentSubtype].(CodecV2)
|
|
return c
|
|
}
|