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delegate.go
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delegate.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package serf
import (
"bytes"
"fmt"
"github.com/armon/go-metrics"
"github.com/hashicorp/go-msgpack/v2/codec"
"github.com/hashicorp/memberlist"
)
// delegate is the memberlist.Delegate implementation that Serf uses.
type delegate struct {
serf *Serf
}
var _ memberlist.Delegate = &delegate{}
func (d *delegate) NodeMeta(limit int) []byte {
roleBytes := d.serf.encodeTags(d.serf.config.Tags)
if len(roleBytes) > limit {
panic(fmt.Errorf("Node tags '%v' exceeds length limit of %d bytes", d.serf.config.Tags, limit))
}
return roleBytes
}
func (d *delegate) NotifyMsg(buf []byte) {
// If we didn't actually receive any data, then ignore it.
if len(buf) == 0 {
return
}
metrics.AddSampleWithLabels([]string{"serf", "msgs", "received"}, float32(len(buf)), d.serf.metricLabels)
rebroadcast := false
rebroadcastQueue := d.serf.broadcasts
t := messageType(buf[0])
if d.serf.config.messageDropper(t) {
return
}
switch t {
case messageLeaveType:
var leave messageLeave
if err := decodeMessage(buf[1:], &leave); err != nil {
d.serf.logger.Printf("[ERR] serf: Error decoding leave message: %s", err)
break
}
d.serf.logger.Printf("[DEBUG] serf: messageLeaveType: %s", leave.Node)
rebroadcast = d.serf.handleNodeLeaveIntent(&leave)
case messageJoinType:
var join messageJoin
if err := decodeMessage(buf[1:], &join); err != nil {
d.serf.logger.Printf("[ERR] serf: Error decoding join message: %s", err)
break
}
d.serf.logger.Printf("[DEBUG] serf: messageJoinType: %s", join.Node)
rebroadcast = d.serf.handleNodeJoinIntent(&join)
case messageUserEventType:
var event messageUserEvent
if err := decodeMessage(buf[1:], &event); err != nil {
d.serf.logger.Printf("[ERR] serf: Error decoding user event message: %s", err)
break
}
d.serf.logger.Printf("[DEBUG] serf: messageUserEventType: %s", event.Name)
rebroadcast = d.serf.handleUserEvent(&event)
rebroadcastQueue = d.serf.eventBroadcasts
case messageQueryType:
var query messageQuery
if err := decodeMessage(buf[1:], &query); err != nil {
d.serf.logger.Printf("[ERR] serf: Error decoding query message: %s", err)
break
}
d.serf.logger.Printf("[DEBUG] serf: messageQueryType: %s", query.Name)
rebroadcast = d.serf.handleQuery(&query)
rebroadcastQueue = d.serf.queryBroadcasts
case messageQueryResponseType:
var resp messageQueryResponse
if err := decodeMessage(buf[1:], &resp); err != nil {
d.serf.logger.Printf("[ERR] serf: Error decoding query response message: %s", err)
break
}
d.serf.logger.Printf("[DEBUG] serf: messageQueryResponseType: %v", resp.From)
d.serf.handleQueryResponse(&resp)
case messageRelayType:
var header relayHeader
var handle codec.MsgpackHandle
reader := bytes.NewReader(buf[1:])
decoder := codec.NewDecoder(reader, &handle)
if err := decoder.Decode(&header); err != nil {
d.serf.logger.Printf("[ERR] serf: Error decoding relay header: %s", err)
break
}
// The remaining contents are the message itself, so forward that
raw := make([]byte, reader.Len())
reader.Read(raw)
addr := memberlist.Address{
Addr: header.DestAddr.String(),
Name: header.DestName,
}
d.serf.logger.Printf("[DEBUG] serf: Relaying response to addr: %s", header.DestAddr.String())
if err := d.serf.memberlist.SendToAddress(addr, raw); err != nil {
d.serf.logger.Printf("[ERR] serf: Error forwarding message to %s: %s", header.DestAddr.String(), err)
break
}
default:
d.serf.logger.Printf("[WARN] serf: Received message of unknown type: %d", t)
}
if rebroadcast {
// Copy the buffer since it we cannot rely on the slice not changing
newBuf := make([]byte, len(buf))
copy(newBuf, buf)
rebroadcastQueue.QueueBroadcast(&broadcast{
msg: newBuf,
notify: nil,
})
}
}
func (d *delegate) GetBroadcasts(overhead, limit int) [][]byte {
msgs := d.serf.broadcasts.GetBroadcasts(overhead, limit)
// Determine the bytes used already
bytesUsed := 0
for _, msg := range msgs {
lm := len(msg)
bytesUsed += lm + overhead
metrics.AddSampleWithLabels([]string{"serf", "msgs", "sent"}, float32(lm), d.serf.metricLabels)
}
// Get any additional query broadcasts
queryMsgs := d.serf.queryBroadcasts.GetBroadcasts(overhead, limit-bytesUsed)
if queryMsgs != nil {
for _, m := range queryMsgs {
lm := len(m)
bytesUsed += lm + overhead
metrics.AddSampleWithLabels([]string{"serf", "msgs", "sent"}, float32(lm), d.serf.metricLabels)
}
msgs = append(msgs, queryMsgs...)
}
// Get any additional event broadcasts
eventMsgs := d.serf.eventBroadcasts.GetBroadcasts(overhead, limit-bytesUsed)
if eventMsgs != nil {
for _, m := range eventMsgs {
lm := len(m)
bytesUsed += lm + overhead
metrics.AddSampleWithLabels([]string{"serf", "msgs", "sent"}, float32(lm), d.serf.keyManager.serf.metricLabels)
}
msgs = append(msgs, eventMsgs...)
}
return msgs
}
func (d *delegate) LocalState(join bool) []byte {
d.serf.memberLock.RLock()
defer d.serf.memberLock.RUnlock()
d.serf.eventLock.RLock()
defer d.serf.eventLock.RUnlock()
// Create the message to send
pp := messagePushPull{
LTime: d.serf.clock.Time(),
StatusLTimes: make(map[string]LamportTime, len(d.serf.members)),
LeftMembers: make([]string, 0, len(d.serf.leftMembers)),
EventLTime: d.serf.eventClock.Time(),
Events: d.serf.eventBuffer,
QueryLTime: d.serf.queryClock.Time(),
}
// Add all the join LTimes
for name, member := range d.serf.members {
pp.StatusLTimes[name] = member.statusLTime
}
// Add all the left nodes
for _, member := range d.serf.leftMembers {
pp.LeftMembers = append(pp.LeftMembers, member.Name)
}
// Encode the push pull state
buf, err := encodeMessage(messagePushPullType, &pp, d.serf.msgpackUseNewTimeFormat)
if err != nil {
d.serf.logger.Printf("[ERR] serf: Failed to encode local state: %v", err)
return nil
}
return buf
}
func (d *delegate) MergeRemoteState(buf []byte, isJoin bool) {
// Ensure we have a message
if len(buf) == 0 {
d.serf.logger.Printf("[ERR] serf: Remote state is zero bytes")
return
}
// Check the message type
if messageType(buf[0]) != messagePushPullType {
d.serf.logger.Printf("[ERR] serf: Remote state has bad type prefix: %v", buf[0])
return
}
if d.serf.config.messageDropper(messagePushPullType) {
return
}
// Attempt a decode
pp := messagePushPull{}
if err := decodeMessage(buf[1:], &pp); err != nil {
d.serf.logger.Printf("[ERR] serf: Failed to decode remote state: %v", err)
return
}
// Witness the Lamport clocks first.
// We subtract 1 since no message with that clock has been sent yet
if pp.LTime > 0 {
d.serf.clock.Witness(pp.LTime - 1)
}
if pp.EventLTime > 0 {
d.serf.eventClock.Witness(pp.EventLTime - 1)
}
if pp.QueryLTime > 0 {
d.serf.queryClock.Witness(pp.QueryLTime - 1)
}
// Process the left nodes first to avoid the LTimes from incrementing
// in the wrong order. Note that we don't have the actual Lamport time
// for the leave message, so we go one past the join time, since the
// leave must have been accepted after that to get onto the left members
// list. If we didn't do this then the message would not get processed.
leftMap := make(map[string]struct{}, len(pp.LeftMembers))
leave := messageLeave{}
for _, name := range pp.LeftMembers {
leftMap[name] = struct{}{}
leave.LTime = pp.StatusLTimes[name] + 1
leave.Node = name
d.serf.handleNodeLeaveIntent(&leave)
}
// Update any other LTimes
join := messageJoin{}
for name, statusLTime := range pp.StatusLTimes {
// Skip the left nodes
if _, ok := leftMap[name]; ok {
continue
}
// Create an artificial join message
join.LTime = statusLTime
join.Node = name
d.serf.handleNodeJoinIntent(&join)
}
// If we are doing a join, and eventJoinIgnore is set
// then we set the eventMinTime to the EventLTime. This
// prevents any of the incoming events from being processed
eventJoinIgnore := d.serf.eventJoinIgnore.Load().(bool)
if isJoin && eventJoinIgnore {
d.serf.eventLock.Lock()
if pp.EventLTime > d.serf.eventMinTime {
d.serf.eventMinTime = pp.EventLTime
}
d.serf.eventLock.Unlock()
}
// Process all the events
userEvent := messageUserEvent{}
for _, events := range pp.Events {
if events == nil {
continue
}
userEvent.LTime = events.LTime
for _, e := range events.Events {
userEvent.Name = e.Name
userEvent.Payload = e.Payload
d.serf.handleUserEvent(&userEvent)
}
}
}