64 lines
1.7 KiB
Go
64 lines
1.7 KiB
Go
/*
|
|
*
|
|
* Copyright 2017 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 passthrough implements a pass-through resolver. It sends the target
|
|
// name without scheme back to gRPC as resolved address.
|
|
package passthrough
|
|
|
|
import (
|
|
"errors"
|
|
|
|
"google.golang.org/grpc/resolver"
|
|
)
|
|
|
|
const scheme = "passthrough"
|
|
|
|
type passthroughBuilder struct{}
|
|
|
|
func (*passthroughBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
|
|
if target.Endpoint() == "" && opts.Dialer == nil {
|
|
return nil, errors.New("passthrough: received empty target in Build()")
|
|
}
|
|
r := &passthroughResolver{
|
|
target: target,
|
|
cc: cc,
|
|
}
|
|
r.start()
|
|
return r, nil
|
|
}
|
|
|
|
func (*passthroughBuilder) Scheme() string {
|
|
return scheme
|
|
}
|
|
|
|
type passthroughResolver struct {
|
|
target resolver.Target
|
|
cc resolver.ClientConn
|
|
}
|
|
|
|
func (r *passthroughResolver) start() {
|
|
r.cc.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: r.target.Endpoint()}}})
|
|
}
|
|
|
|
func (*passthroughResolver) ResolveNow(o resolver.ResolveNowOptions) {}
|
|
|
|
func (*passthroughResolver) Close() {}
|
|
|
|
func init() {
|
|
resolver.Register(&passthroughBuilder{})
|
|
}
|