47 lines
1.2 KiB
Go
47 lines
1.2 KiB
Go
|
/*
|
||
|
|
* Copyright 2019 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 balancerload defines APIs to parse server loads in trailers. The
|
||
|
|
// parsed loads are sent to balancers in DoneInfo.
|
||
|
|
package balancerload
|
||
|
|
|
||
|
|
import (
|
||
|
|
"google.golang.org/grpc/metadata"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Parser converts loads from metadata into a concrete type.
|
||
|
|
type Parser interface {
|
||
|
|
// Parse parses loads from metadata.
|
||
|
|
Parse(md metadata.MD) interface{}
|
||
|
|
}
|
||
|
|
|
||
|
|
var parser Parser
|
||
|
|
|
||
|
|
// SetParser sets the load parser.
|
||
|
|
//
|
||
|
|
// Not mutex-protected, should be called before any gRPC functions.
|
||
|
|
func SetParser(lr Parser) {
|
||
|
|
parser = lr
|
||
|
|
}
|
||
|
|
|
||
|
|
// Parse calls parser.Read().
|
||
|
|
func Parse(md metadata.MD) interface{} {
|
||
|
|
if parser == nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
return parser.Parse(md)
|
||
|
|
}
|