71 lines
2.2 KiB
Go
71 lines
2.2 KiB
Go
package networkdb
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import (
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"encoding/json"
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"net"
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"github.com/hashicorp/memberlist"
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"github.com/sirupsen/logrus"
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)
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type eventDelegate struct {
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nDB *NetworkDB
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}
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func (e *eventDelegate) broadcastNodeEvent(addr net.IP, op opType) {
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value, err := json.Marshal(&NodeAddr{addr})
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if err == nil {
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e.nDB.broadcaster.Write(makeEvent(op, NodeTable, "", "", value))
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} else {
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logrus.Errorf("Error marshalling node broadcast event %s", addr.String())
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}
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}
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func (e *eventDelegate) NotifyJoin(mn *memberlist.Node) {
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logrus.Infof("Node %s/%s, joined gossip cluster", mn.Name, mn.Addr)
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e.broadcastNodeEvent(mn.Addr, opCreate)
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e.nDB.Lock()
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// In case the node is rejoining after a failure or leave,
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// wait until an explicit join message arrives before adding
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// it to the nodes just to make sure this is not a stale
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// join. If you don't know about this node add it immediately.
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_, fOk := e.nDB.failedNodes[mn.Name]
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_, lOk := e.nDB.leftNodes[mn.Name]
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if fOk || lOk {
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e.nDB.Unlock()
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return
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}
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e.nDB.nodes[mn.Name] = &node{Node: *mn}
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e.nDB.Unlock()
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logrus.Infof("Node %s/%s, added to nodes list", mn.Name, mn.Addr)
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}
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func (e *eventDelegate) NotifyLeave(mn *memberlist.Node) {
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var failed bool
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logrus.Infof("Node %s/%s, left gossip cluster", mn.Name, mn.Addr)
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e.broadcastNodeEvent(mn.Addr, opDelete)
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// The node left or failed, delete all the entries created by it.
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// If the node was temporary down, deleting the entries will guarantee that the CREATE events will be accepted
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// If the node instead left because was going down, then it makes sense to just delete all its state
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e.nDB.Lock()
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e.nDB.deleteNetworkEntriesForNode(mn.Name)
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e.nDB.deleteNodeTableEntries(mn.Name)
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if n, ok := e.nDB.nodes[mn.Name]; ok {
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delete(e.nDB.nodes, mn.Name)
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// In case of node failure, keep retrying to reconnect every retryInterval (1sec) for nodeReapInterval (24h)
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// Explicit leave will have already removed the node from the list of nodes (nDB.nodes) and put it into the leftNodes map
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n.reapTime = nodeReapInterval
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e.nDB.failedNodes[mn.Name] = n
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failed = true
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}
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e.nDB.Unlock()
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if failed {
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logrus.Infof("Node %s/%s, added to failed nodes list", mn.Name, mn.Addr)
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}
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}
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func (e *eventDelegate) NotifyUpdate(n *memberlist.Node) {
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}
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