mirror of https://github.com/kubernetes/kops.git
153 lines
3.8 KiB
Go
153 lines
3.8 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 mesh
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import (
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"github.com/golang/glog"
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"github.com/weaveworks/mesh"
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"k8s.io/kops/protokube/pkg/gossip"
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)
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// Peer encapsulates state and implements mesh.Gossiper.
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// It should be passed to mesh.Router.NewGossip,
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// and the resulting Gossip registered in turn,
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// before calling mesh.Router.Start.
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type peer struct {
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st *state
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send mesh.Gossip
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actions chan<- func()
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quit chan struct{}
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}
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// peer implements mesh.Gossiper.
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var _ mesh.Gossiper = &peer{}
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// Construct a peer with empty state.
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// Be sure to register a channel, later,
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// so we can make outbound communication.
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func newPeer(self mesh.PeerName) *peer {
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actions := make(chan func())
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p := &peer{
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st: newState(self),
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send: nil, // must .register() later
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actions: actions,
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quit: make(chan struct{}),
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}
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go p.loop(actions)
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return p
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}
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func (p *peer) loop(actions <-chan func()) {
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for {
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select {
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case f := <-actions:
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f()
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case <-p.quit:
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return
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}
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}
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}
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// register the result of a mesh.Router.NewGossip.
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func (p *peer) register(send mesh.Gossip) {
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p.actions <- func() { p.send = send }
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}
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func (p *peer) snapshot() *gossip.GossipStateSnapshot {
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return p.st.snapshot()
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}
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func (p *peer) updateValues(removeKeys []string, putEntries map[string]string) error {
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c := make(chan struct{})
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p.actions <- func() {
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defer close(c)
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p.st.updateValues(removeKeys, putEntries)
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if p.send != nil {
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gossipData := p.st.getData()
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p.send.GossipBroadcast(gossipData)
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} else {
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glog.Warningf("no sender configured; not broadcasting update right now")
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}
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}
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<-c
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return nil
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}
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func (p *peer) stop() {
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close(p.quit)
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}
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// Return a copy of our complete state.
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func (p *peer) Gossip() (complete mesh.GossipData) {
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data := p.st.getData()
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glog.V(4).Infof("Gossip => complete %v", data)
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return data
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}
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// Merge the gossiped data represented by buf into our state.
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// Return the state information that was modified.
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func (p *peer) OnGossip(buf []byte) (delta mesh.GossipData, err error) {
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message, err := DecodeKVState(buf)
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if err != nil {
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glog.Warningf("error decoding OnGossip: %v", err)
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return nil, err
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}
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deltas := &KVState{}
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p.st.merge(message, deltas)
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if len(deltas.Records) == 0 {
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// per OnGossip requirements
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glog.V(4).Infof("OnGossip %v => delta empty", message)
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return nil, nil
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} else {
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glog.V(4).Infof("OnGossip %v => delta %v", message, deltas)
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return deltas, nil
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}
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}
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// Merge the gossiped data represented by buf into our state.
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// Return the state information that was modified.
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func (p *peer) OnGossipBroadcast(src mesh.PeerName, buf []byte) (received mesh.GossipData, err error) {
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message, err := DecodeKVState(buf)
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if err != nil {
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glog.Warningf("error decoding OnGossipBroadcast: %v", err)
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return nil, err
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}
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deltas := &KVState{}
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p.st.merge(message, deltas)
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glog.V(4).Infof("OnGossipBroadcast %s %v => delta %v", src, message, deltas)
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return deltas, nil
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}
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// Merge the gossiped data represented by buf into our state.
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func (p *peer) OnGossipUnicast(src mesh.PeerName, buf []byte) error {
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message, err := DecodeKVState(buf)
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if err != nil {
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glog.Warningf("error decoding OnGossipUnicast: %v", err)
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return err
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}
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p.st.merge(message, nil)
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glog.V(4).Infof("OnGossipUnicast %s %v => complete %v", src, message, p.st)
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return nil
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}
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