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