| /* |
| * |
| * 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.Authority != "" { |
| return nil, fmt.Errorf("invalid (non-empty) authority: %v", target.Authority) |
| } |
| |
| // 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 { |
| // prepend "\x00" to address for unix-abstract |
| addr.Addr = "\x00" + 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}) |
| } |