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/*
*
* Copyright 2021 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 xds
import (
"net"
"google.golang.org/grpc"
"google.golang.org/grpc/connectivity"
)
type serverOptions struct {
modeCallback ServingModeCallbackFunc
bootstrapContentsForTesting []byte
}
type serverOption struct {
grpc.EmptyServerOption
apply func(*serverOptions)
}
// ServingModeCallback returns a grpc.ServerOption which allows users to
// register a callback to get notified about serving mode changes.
func ServingModeCallback(cb ServingModeCallbackFunc) grpc.ServerOption {
return &serverOption{apply: func(o *serverOptions) { o.modeCallback = cb }}
}
// ServingModeCallbackFunc is the callback that users can register to get
// notified about the server's serving mode changes. The callback is invoked
// with the address of the listener and its new mode.
//
// Users must not perform any blocking operations in this callback.
type ServingModeCallbackFunc func(addr net.Addr, args ServingModeChangeArgs)
// ServingModeChangeArgs wraps the arguments passed to the serving mode callback
// function.
type ServingModeChangeArgs struct {
// Mode is the new serving mode of the server listener.
Mode connectivity.ServingMode
// Err is set to a non-nil error if the server has transitioned into
// not-serving mode.
Err error
}
// BootstrapContentsForTesting returns a grpc.ServerOption which allows users
// to inject a bootstrap configuration used by only this server, instead of the
// global configuration from the environment variables.
//
// # Testing Only
//
// This function should ONLY be used for testing and may not work with some
// other features, including the CSDS service.
//
// # Experimental
//
// Notice: This API is EXPERIMENTAL and may be changed or removed in a
// later release.
func BootstrapContentsForTesting(contents []byte) grpc.ServerOption {
return &serverOption{apply: func(o *serverOptions) { o.bootstrapContentsForTesting = contents }}
}
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