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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 "google.golang.org/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.BuildOption) (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.NewAddress([]resolver.Address{{Addr: r.target.Endpoint}}) | |
49 | } | |
50 | ||
51 | func (*passthroughResolver) ResolveNow(o resolver.ResolveNowOption) {} | |
52 | ||
53 | func (*passthroughResolver) Close() {} | |
54 | ||
55 | func init() { | |
56 | resolver.Register(&passthroughBuilder{}) | |
57 | } |