mirror of https://github.com/grpc/grpc-go.git
69 lines
2.2 KiB
Go
69 lines
2.2 KiB
Go
/*
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*
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* Copyright 2022 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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package outlierdetection
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import (
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"unsafe"
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"google.golang.org/grpc/balancer"
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"google.golang.org/grpc/internal/buffer"
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"google.golang.org/grpc/resolver"
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)
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// subConnWrapper wraps every created SubConn in the Outlier Detection Balancer,
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// to help track the latest state update from the underlying SubConn, and also
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// whether or not this SubConn is ejected.
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type subConnWrapper struct {
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balancer.SubConn
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// addressInfo is a pointer to the subConnWrapper's corresponding address
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// map entry, if the map entry exists.
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addressInfo unsafe.Pointer // *addressInfo
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// These two pieces of state will reach eventual consistency due to sync in
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// run(), and child will always have the correctly updated SubConnState.
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// latestState is the latest state update from the underlying SubConn. This
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// is used whenever a SubConn gets unejected.
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latestState balancer.SubConnState
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ejected bool
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scUpdateCh *buffer.Unbounded
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// addresses is the list of address(es) this SubConn was created with to
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// help support any change in address(es)
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addresses []resolver.Address
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}
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// eject causes the wrapper to report a state update with the TRANSIENT_FAILURE
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// state, and to stop passing along updates from the underlying subchannel.
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func (scw *subConnWrapper) eject() {
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scw.scUpdateCh.Put(&ejectionUpdate{
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scw: scw,
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isEjected: true,
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})
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}
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// uneject causes the wrapper to report a state update with the latest update
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// from the underlying subchannel, and resume passing along updates from the
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// underlying subchannel.
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func (scw *subConnWrapper) uneject() {
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scw.scUpdateCh.Put(&ejectionUpdate{
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scw: scw,
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isEjected: false,
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})
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}
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