dubbo.apache.org/dubbo-go/v3@v3.1.1/xds/utils/resolver/passthrough/passthrough.go (about)

     1  /*
     2   * Licensed to the Apache Software Foundation (ASF) under one or more
     3   * contributor license agreements.  See the NOTICE file distributed with
     4   * this work for additional information regarding copyright ownership.
     5   * The ASF licenses this file to You under the Apache License, Version 2.0
     6   * (the "License"); you may not use this file except in compliance with
     7   * the License.  You may obtain a copy of the License at
     8   *
     9   *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17  
    18  /*
    19   *
    20   * Copyright 2021 gRPC authors.
    21   *
    22   */
    23  
    24  // Package passthrough implements a pass-through resolver. It sends the target
    25  // name without scheme back to gRPC as resolved address.
    26  package passthrough
    27  
    28  import (
    29  	"google.golang.org/grpc/resolver"
    30  )
    31  
    32  const scheme = "passthrough"
    33  
    34  type passthroughBuilder struct{}
    35  
    36  func (*passthroughBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
    37  	r := &passthroughResolver{
    38  		target: target,
    39  		cc:     cc,
    40  	}
    41  	r.start()
    42  	return r, nil
    43  }
    44  
    45  func (*passthroughBuilder) Scheme() string {
    46  	return scheme
    47  }
    48  
    49  type passthroughResolver struct {
    50  	target resolver.Target
    51  	cc     resolver.ClientConn
    52  }
    53  
    54  func (r *passthroughResolver) start() {
    55  	r.cc.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: r.target.Endpoint}}})
    56  }
    57  
    58  func (*passthroughResolver) ResolveNow(o resolver.ResolveNowOptions) {}
    59  
    60  func (*passthroughResolver) Close() {}
    61  
    62  func init() {
    63  	resolver.Register(&passthroughBuilder{})
    64  }