79 lines
2.2 KiB
Go
79 lines
2.2 KiB
Go
/*
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*
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* Copyright 2020 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Package unix implements a resolver for unix targets.
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package unix
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import (
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"fmt"
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"google.golang.org/grpc/internal/transport/networktype"
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"google.golang.org/grpc/resolver"
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)
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const unixScheme = "unix"
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const unixAbstractScheme = "unix-abstract"
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type builder struct {
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scheme string
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}
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func (b *builder) Build(target resolver.Target, cc resolver.ClientConn, _ resolver.BuildOptions) (resolver.Resolver, error) {
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if target.URL.Host != "" {
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return nil, fmt.Errorf("invalid (non-empty) authority: %v", target.URL.Host)
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}
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// gRPC was parsing the dial target manually before PR #4817, and we
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// switched to using url.Parse() in that PR. To avoid breaking existing
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// resolver implementations we ended up stripping the leading "/" from the
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// endpoint. This obviously does not work for the "unix" scheme. Hence we
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// end up using the parsed URL instead.
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endpoint := target.URL.Path
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if endpoint == "" {
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endpoint = target.URL.Opaque
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}
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addr := resolver.Address{Addr: endpoint}
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if b.scheme == unixAbstractScheme {
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// We can not prepend \0 as c++ gRPC does, as in Golang '@' is used to signify we do
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// not want trailing \0 in address.
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addr.Addr = "@" + addr.Addr
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}
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cc.UpdateState(resolver.State{Addresses: []resolver.Address{networktype.Set(addr, "unix")}})
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return &nopResolver{}, nil
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}
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func (b *builder) Scheme() string {
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return b.scheme
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}
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func (b *builder) OverrideAuthority(resolver.Target) string {
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return "localhost"
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}
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type nopResolver struct {
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}
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func (*nopResolver) ResolveNow(resolver.ResolveNowOptions) {}
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func (*nopResolver) Close() {}
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func init() {
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resolver.Register(&builder{scheme: unixScheme})
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resolver.Register(&builder{scheme: unixAbstractScheme})
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}
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