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package networkdb
import (
"errors"
"time"
"github.com/hashicorp/memberlist"
"github.com/hashicorp/serf/serf"
)
const broadcastTimeout = 5 * time.Second
type networkEventMessage struct {
id string
node string
msg []byte
}
func (m *networkEventMessage) Invalidates(other memberlist.Broadcast) bool {
otherm := other.(*networkEventMessage)
return m.id == otherm.id && m.node == otherm.node
}
func (m *networkEventMessage) Message() []byte {
return m.msg
}
func (m *networkEventMessage) Finished() {
}
func (nDB *NetworkDB) sendNetworkEvent(nid string, event NetworkEvent_Type, ltime serf.LamportTime) error {
nEvent := NetworkEvent{
Type: event,
LTime: ltime,
NodeName: nDB.config.NodeID,
NetworkID: nid,
}
raw, err := encodeMessage(MessageTypeNetworkEvent, &nEvent)
if err != nil {
return err
}
nDB.networkBroadcasts.QueueBroadcast(&networkEventMessage{
msg: raw,
id: nid,
node: nDB.config.NodeID,
})
return nil
}
type nodeEventMessage struct {
msg []byte
notify chan<- struct{}
}
func (m *nodeEventMessage) Invalidates(other memberlist.Broadcast) bool {
return false
}
func (m *nodeEventMessage) Message() []byte {
return m.msg
}
func (m *nodeEventMessage) Finished() {
if m.notify != nil {
close(m.notify)
}
}
func (nDB *NetworkDB) sendNodeEvent(event NodeEvent_Type) error {
nEvent := NodeEvent{
Type: event,
LTime: nDB.networkClock.Increment(),
NodeName: nDB.config.NodeID,
}
raw, err := encodeMessage(MessageTypeNodeEvent, &nEvent)
if err != nil {
return err
}
notifyCh := make(chan struct{})
nDB.nodeBroadcasts.QueueBroadcast(&nodeEventMessage{
msg: raw,
notify: notifyCh,
})
nDB.RLock()
noPeers := len(nDB.nodes) <= 1
nDB.RUnlock()
// Message enqueued, do not wait for a send if no peer is present
if noPeers {
return nil
}
// Wait for the broadcast
select {
case <-notifyCh:
case <-time.After(broadcastTimeout):
return errors.New("timed out broadcasting node event")
}
return nil
}
type tableEventMessage struct {
id string
tname string
key string
msg []byte
}
func (m *tableEventMessage) Invalidates(other memberlist.Broadcast) bool {
otherm := other.(*tableEventMessage)
return m.tname == otherm.tname && m.id == otherm.id && m.key == otherm.key
}
func (m *tableEventMessage) Message() []byte {
return m.msg
}
func (m *tableEventMessage) Finished() {
}
func (nDB *NetworkDB) sendTableEvent(event TableEvent_Type, nid string, tname string, key string, entry *entry) error {
tEvent := TableEvent{
Type: event,
LTime: entry.ltime,
NodeName: nDB.config.NodeID,
NetworkID: nid,
TableName: tname,
Key: key,
Value: entry.value,
// The duration in second is a float that below would be truncated
ResidualReapTime: int32(entry.reapTime.Seconds()),
}
raw, err := encodeMessage(MessageTypeTableEvent, &tEvent)
if err != nil {
return err
}
var broadcastQ *memberlist.TransmitLimitedQueue
nDB.RLock()
thisNodeNetworks, ok := nDB.networks[nDB.config.NodeID]
if ok {
// The network may have been removed
network, networkOk := thisNodeNetworks[nid]
if !networkOk {
nDB.RUnlock()
return nil
}
broadcastQ = network.tableBroadcasts
}
nDB.RUnlock()
// The network may have been removed
if broadcastQ == nil {
return nil
}
broadcastQ.QueueBroadcast(&tableEventMessage{
msg: raw,
id: nid,
tname: tname,
key: key,
})
return nil
}
|
