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bootstrap.go
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bootstrap.go
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/*
*
* Copyright 2022 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 bootstrap provides the functionality to register possible options
// for aspects of the xDS client through the bootstrap file.
//
// # Experimental
//
// Notice: This package is EXPERIMENTAL and may be changed or removed
// in a later release.
package bootstrap
import (
"encoding/json"
"google.golang.org/grpc/credentials"
)
// registry is a map from credential type name to Credential builder.
var registry = make(map[string]Credentials)
// Credentials interface encapsulates a credentials.Bundle builder
// that can be used for communicating with the xDS Management server.
type Credentials interface {
// Build returns a credential bundle associated with this credential, and
// a function to cleans up additional resources associated with this bundle
// when it is no longer needed.
Build(config json.RawMessage) (credentials.Bundle, func(), error)
// Name returns the credential name associated with this credential.
Name() string
}
// RegisterCredentials registers Credentials used for connecting to the xds
// management server.
//
// NOTE: this function must only be called during initialization time (i.e. in
// an init() function), and is not thread-safe. If multiple credentials are
// registered with the same name, the one registered last will take effect.
func RegisterCredentials(c Credentials) {
registry[c.Name()] = c
}
// GetCredentials returns the credentials associated with a given name.
// If no credentials are registered with the name, nil will be returned.
func GetCredentials(name string) Credentials {
if c, ok := registry[name]; ok {
return c
}
return nil
}