| /* |
| * |
| * Copyright 2020 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| // Package state declares grpclb types to be set by resolvers wishing to pass |
| // information to grpclb via resolver.State Attributes. |
| package state |
| |
| import ( |
| "google.golang.org/grpc/resolver" |
| ) |
| |
| // keyType is the key to use for storing State in Attributes. |
| type keyType string |
| |
| const key = keyType("grpc.grpclb.state") |
| |
| // State contains gRPCLB-relevant data passed from the name resolver. |
| type State struct { |
| // BalancerAddresses contains the remote load balancer address(es). If |
| // set, overrides any resolver-provided addresses with Type of GRPCLB. |
| BalancerAddresses []resolver.Address |
| } |
| |
| // Set returns a copy of the provided state with attributes containing s. s's |
| // data should not be mutated after calling Set. |
| func Set(state resolver.State, s *State) resolver.State { |
| state.Attributes = state.Attributes.WithValues(key, s) |
| return state |
| } |
| |
| // Get returns the grpclb State in the resolver.State, or nil if not present. |
| // The returned data should not be mutated. |
| func Get(state resolver.State) *State { |
| s, _ := state.Attributes.Value(key).(*State) |
| return s |
| } |