mirror of https://github.com/docker/cli.git
51 lines
1.4 KiB
Go
51 lines
1.4 KiB
Go
|
/*
|
||
|
|
*
|
||
|
|
* Copyright 2020 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 metadata contains functions to set and get metadata from addresses.
|
||
|
|
//
|
||
|
|
// This package is experimental.
|
||
|
|
package metadata
|
||
|
|
|
||
|
|
import (
|
||
|
|
"google.golang.org/grpc/metadata"
|
||
|
|
"google.golang.org/grpc/resolver"
|
||
|
|
)
|
||
|
|
|
||
|
|
type mdKeyType string
|
||
|
|
|
||
|
|
const mdKey = mdKeyType("grpc.internal.address.metadata")
|
||
|
|
|
||
|
|
// Get returns the metadata of addr.
|
||
|
|
func Get(addr resolver.Address) metadata.MD {
|
||
|
|
attrs := addr.Attributes
|
||
|
|
if attrs == nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
md, _ := attrs.Value(mdKey).(metadata.MD)
|
||
|
|
return md
|
||
|
|
}
|
||
|
|
|
||
|
|
// Set sets (overrides) the metadata in addr.
|
||
|
|
//
|
||
|
|
// When a SubConn is created with this address, the RPCs sent on it will all
|
||
|
|
// have this metadata.
|
||
|
|
func Set(addr resolver.Address, md metadata.MD) resolver.Address {
|
||
|
|
addr.Attributes = addr.Attributes.WithValues(mdKey, md)
|
||
|
|
return addr
|
||
|
|
}
|