github.com/hxx258456/ccgo@v0.0.5-0.20230213014102-48b35f46f66f/grpc/internal/resolver/passthrough/passthrough.go (about)

     1  /*
     2   *
     3   * Copyright 2017 gRPC authors.
     4   *
     5   * Licensed under the Apache License, Version 2.0 (the "License");
     6   * you may not use this file except in compliance with the License.
     7   * 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  // Package passthrough implements a pass-through resolver. It sends the target
    20  // name without scheme back to gRPC as resolved address.
    21  package passthrough
    22  
    23  import "github.com/hxx258456/ccgo/grpc/resolver"
    24  
    25  const scheme = "passthrough"
    26  
    27  type passthroughBuilder struct{}
    28  
    29  func (*passthroughBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
    30  	r := &passthroughResolver{
    31  		target: target,
    32  		cc:     cc,
    33  	}
    34  	r.start()
    35  	return r, nil
    36  }
    37  
    38  func (*passthroughBuilder) Scheme() string {
    39  	return scheme
    40  }
    41  
    42  type passthroughResolver struct {
    43  	target resolver.Target
    44  	cc     resolver.ClientConn
    45  }
    46  
    47  func (r *passthroughResolver) start() {
    48  	r.cc.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: r.target.Endpoint}}})
    49  }
    50  
    51  func (*passthroughResolver) ResolveNow(o resolver.ResolveNowOptions) {}
    52  
    53  func (*passthroughResolver) Close() {}
    54  
    55  func init() {
    56  	resolver.Register(&passthroughBuilder{})
    57  }