github.com/kaydxh/golang@v0.0.131/go/net/resolver/unix/unix.go (about)

     1  /*
     2   *Copyright (c) 2022, kaydxh
     3   *
     4   *Permission is hereby granted, free of charge, to any person obtaining a copy
     5   *of this software and associated documentation files (the "Software"), to deal
     6   *in the Software without restriction, including without limitation the rights
     7   *to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     8   *copies of the Software, and to permit persons to whom the Software is
     9   *furnished to do so, subject to the following conditions:
    10   *
    11   *The above copyright notice and this permission notice shall be included in all
    12   *copies or substantial portions of the Software.
    13   *
    14   *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    15   *IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    16   *FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    17   *AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    18   *LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    19   *OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    20   *SOFTWARE.
    21   */
    22  package unix
    23  
    24  import (
    25  	"fmt"
    26  
    27  	"github.com/kaydxh/golang/go/net/resolver"
    28  )
    29  
    30  const unixScheme = "unix"
    31  const unixAbstractScheme = "unix-abstract"
    32  
    33  type builder struct {
    34  	scheme string
    35  }
    36  
    37  func (b *builder) Build(target resolver.Target, opts ...resolver.ResolverBuildOption) (resolver.Resolver, error) {
    38  	if target.Authority != "" {
    39  		return nil, fmt.Errorf("invalid (non-empty) authority: %v", target.Authority)
    40  	}
    41  	var opt resolver.ResolverBuildOptions
    42  	opt.ApplyOptions(opts...)
    43  	addr := resolver.Address{Addr: target.Endpoint}
    44  	if b.scheme == unixAbstractScheme {
    45  		// prepend "\x00" to address for unix-abstract
    46  		addr.Addr = "\x00" + addr.Addr
    47  	}
    48  	cc := opt.Cc
    49  	if cc != nil {
    50  		cc.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: addr.Addr}}})
    51  	}
    52  	return &nopResolver{addrs: []resolver.Address{{Addr: addr.Addr}}}, nil
    53  }
    54  
    55  func (b *builder) Scheme() string {
    56  	return b.scheme
    57  }
    58  
    59  type nopResolver struct {
    60  	addrs []resolver.Address
    61  }
    62  
    63  func (*nopResolver) ResolveOne(opts ...resolver.ResolveOneOption) (resolver.Address, error) {
    64  	return resolver.Address{}, nil
    65  }
    66  
    67  func (*nopResolver) ResolveAll(opts ...resolver.ResolveAllOption) ([]resolver.Address, error) {
    68  	return nil, nil
    69  }
    70  
    71  func (*nopResolver) ResolveNow(opts ...resolver.ResolveNowOption) {}
    72  
    73  func (*nopResolver) Close() {}
    74  
    75  func init() {
    76  	resolver.Register(&builder{scheme: unixScheme})
    77  	resolver.Register(&builder{scheme: unixAbstractScheme})
    78  }