forked from mirrors/gotosocial
75 lines
2.2 KiB
Go
75 lines
2.2 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 unix implements a resolver for unix targets.
|
||
|
|
package unix
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
|
||
|
|
"google.golang.org/grpc/internal/transport/networktype"
|
||
|
|
"google.golang.org/grpc/resolver"
|
||
|
|
)
|
||
|
|
|
||
|
|
const unixScheme = "unix"
|
||
|
|
const unixAbstractScheme = "unix-abstract"
|
||
|
|
|
||
|
|
type builder struct {
|
||
|
|
scheme string
|
||
|
|
}
|
||
|
|
|
||
|
|
func (b *builder) Build(target resolver.Target, cc resolver.ClientConn, _ resolver.BuildOptions) (resolver.Resolver, error) {
|
||
|
|
if target.URL.Host != "" {
|
||
|
|
return nil, fmt.Errorf("invalid (non-empty) authority: %v", target.URL.Host)
|
||
|
|
}
|
||
|
|
|
||
|
|
// gRPC was parsing the dial target manually before PR #4817, and we
|
||
|
|
// switched to using url.Parse() in that PR. To avoid breaking existing
|
||
|
|
// resolver implementations we ended up stripping the leading "/" from the
|
||
|
|
// endpoint. This obviously does not work for the "unix" scheme. Hence we
|
||
|
|
// end up using the parsed URL instead.
|
||
|
|
endpoint := target.URL.Path
|
||
|
|
if endpoint == "" {
|
||
|
|
endpoint = target.URL.Opaque
|
||
|
|
}
|
||
|
|
addr := resolver.Address{Addr: endpoint}
|
||
|
|
if b.scheme == unixAbstractScheme {
|
||
|
|
// We can not prepend \0 as c++ gRPC does, as in Golang '@' is used to signify we do
|
||
|
|
// not want trailing \0 in address.
|
||
|
|
addr.Addr = "@" + addr.Addr
|
||
|
|
}
|
||
|
|
cc.UpdateState(resolver.State{Addresses: []resolver.Address{networktype.Set(addr, "unix")}})
|
||
|
|
return &nopResolver{}, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (b *builder) Scheme() string {
|
||
|
|
return b.scheme
|
||
|
|
}
|
||
|
|
|
||
|
|
type nopResolver struct {
|
||
|
|
}
|
||
|
|
|
||
|
|
func (*nopResolver) ResolveNow(resolver.ResolveNowOptions) {}
|
||
|
|
|
||
|
|
func (*nopResolver) Close() {}
|
||
|
|
|
||
|
|
func init() {
|
||
|
|
resolver.Register(&builder{scheme: unixScheme})
|
||
|
|
resolver.Register(&builder{scheme: unixAbstractScheme})
|
||
|
|
}
|