/
worker.go
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/
worker.go
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// Copyright 2014 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package peergrouper
import (
"fmt"
"net"
"reflect"
"sort"
"strconv"
"strings"
"time"
"github.com/juju/clock"
"github.com/juju/collections/set"
"github.com/juju/errors"
"github.com/juju/loggo"
"github.com/juju/replicaset/v3"
"github.com/juju/worker/v3"
"github.com/juju/worker/v3/catacomb"
"github.com/kr/pretty"
"github.com/prometheus/client_golang/prometheus"
"github.com/juju/juju/controller"
"github.com/juju/juju/core/network"
"github.com/juju/juju/core/status"
"github.com/juju/juju/pubsub/apiserver"
"github.com/juju/juju/state"
)
var logger = loggo.GetLogger("juju.worker.peergrouper")
type State interface {
RemoveControllerReference(m ControllerNode) error
ControllerConfig() (controller.Config, error)
ControllerIds() ([]string, error)
ControllerNode(id string) (ControllerNode, error)
ControllerHost(id string) (ControllerHost, error)
WatchControllerInfo() state.StringsWatcher
WatchControllerStatusChanges() state.StringsWatcher
WatchControllerConfig() state.NotifyWatcher
Space(name string) (Space, error)
}
type ControllerNode interface {
Id() string
Refresh() error
Watch() state.NotifyWatcher
WantsVote() bool
HasVote() bool
SetHasVote(hasVote bool) error
}
type ControllerHost interface {
Id() string
Life() state.Life
Watch() state.NotifyWatcher
SetStatus(status.StatusInfo) error
Refresh() error
Addresses() network.SpaceAddresses
}
type Space interface {
NetworkSpace() (network.SpaceInfo, error)
}
type MongoSession interface {
CurrentStatus() (*replicaset.Status, error)
CurrentMembers() ([]replicaset.Member, error)
Set([]replicaset.Member) error
StepDownPrimary() error
Refresh()
}
type APIHostPortsSetter interface {
SetAPIHostPorts([]network.SpaceHostPorts) error
}
var (
// If we fail to set the mongo replica set members,
// we start retrying with the following interval,
// before exponentially backing off with each further
// attempt.
initialRetryInterval = 2 * time.Second
// maxRetryInterval holds the maximum interval
// between retry attempts.
maxRetryInterval = 5 * time.Minute
// pollInterval holds the interval at which the replica set
// members will be updated even in the absence of changes
// to State. This enables us to make changes to members
// that are triggered by changes to member status.
pollInterval = 1 * time.Minute
// IdleFunc allows tests to be able to get callbacks when the controller
// hasn't been given any changes for a specified time.
IdleFunc func()
// IdleTime relates to how long the controller needs to wait with no changes
// to be considered idle.
IdleTime = 50 * time.Millisecond
)
// Hub defines the methods of the apiserver centralhub that the peer
// grouper uses.
type Hub interface {
Subscribe(topic string, handler interface{}) (func(), error)
Publish(topic string, data interface{}) (func(), error)
}
// pgWorker is a worker which watches the controller nodes in state
// as well as the MongoDB replicaset configuration, adding and
// removing controller nodes as they change or are added and
// removed.
type pgWorker struct {
catacomb catacomb.Catacomb
config Config
// controllerChanges receives events from the controllerTrackers when
// controller nodes change in ways that are relevant to the
// peergrouper.
controllerChanges chan struct{}
// controllerTrackers holds the workers which track the nodes we
// are currently watching (all the controller nodes).
controllerTrackers map[string]*controllerTracker
// detailsRequests is used to feed details requests from the hub into the main loop.
detailsRequests chan string
// serverDetails holds the last server information broadcast via pub/sub.
// It is used to detect changes since the last publish.
serverDetails apiserver.Details
metrics *Collector
idleFunc func()
}
// Config holds the configuration for a peergrouper worker.
type Config struct {
State State
APIHostPortsSetter APIHostPortsSetter
MongoSession MongoSession
Clock clock.Clock
MongoPort int
APIPort int
ControllerAPIPort int
// ControllerId is the id of the controller running this worker.
// It is used in checking if this working is running on the
// primary mongo node.
ControllerId func() string
// Kubernetes controllers do not support HA yet.
SupportsHA bool
// Hub is the central hub of the apiserver,
// and is used to publish the details of the
// API servers.
Hub Hub
PrometheusRegisterer prometheus.Registerer
// UpdateNotify is called when the update channel is signalled.
// Used solely for test synchronization.
UpdateNotify func()
}
// Validate validates the worker configuration.
func (config Config) Validate() error {
if config.State == nil {
return errors.NotValidf("nil State")
}
if config.APIHostPortsSetter == nil {
return errors.NotValidf("nil APIHostPortsSetter")
}
if config.MongoSession == nil {
return errors.NotValidf("nil MongoSession")
}
if config.Clock == nil {
return errors.NotValidf("nil Clock")
}
if config.Hub == nil {
return errors.NotValidf("nil Hub")
}
if config.PrometheusRegisterer == nil {
return errors.NotValidf("nil PrometheusRegisterer")
}
if config.MongoPort <= 0 {
return errors.NotValidf("non-positive MongoPort")
}
if config.APIPort <= 0 {
return errors.NotValidf("non-positive APIPort")
}
// TODO Juju 3.0: make ControllerAPIPort required.
return nil
}
// New returns a new worker that maintains the mongo replica set
// with respect to the given state.
func New(config Config) (worker.Worker, error) {
if err := config.Validate(); err != nil {
return nil, errors.Trace(err)
}
w := &pgWorker{
config: config,
controllerChanges: make(chan struct{}),
controllerTrackers: make(map[string]*controllerTracker),
detailsRequests: make(chan string),
idleFunc: IdleFunc,
metrics: NewMetricsCollector(),
}
err := catacomb.Invoke(catacomb.Plan{
Site: &w.catacomb,
Work: w.loop,
})
if err != nil {
return nil, errors.Trace(err)
}
return w, nil
}
// Kill is part of the worker.Worker interface.
func (w *pgWorker) Kill() {
w.catacomb.Kill(nil)
}
// Wait is part of the worker.Worker interface.
func (w *pgWorker) Wait() error {
return w.catacomb.Wait()
}
// Report is shown in the engine report.
func (w *pgWorker) Report() map[string]interface{} {
if w.metrics == nil {
return nil
}
return w.metrics.report()
}
func (w *pgWorker) loop() error {
_ = w.config.PrometheusRegisterer.Register(w.metrics)
defer w.config.PrometheusRegisterer.Unregister(w.metrics)
controllerChanges, err := w.watchForControllerChanges()
if err != nil {
return errors.Trace(err)
}
configChanges, err := w.watchForConfigChanges()
if err != nil {
return errors.Trace(err)
}
unsubscribe, err := w.config.Hub.Subscribe(apiserver.DetailsRequestTopic, w.apiserverDetailsRequested)
if err != nil {
return errors.Trace(err)
}
defer unsubscribe()
var updateChan <-chan time.Time
retryInterval := initialRetryInterval
idle := &time.Timer{}
if w.idleFunc != nil {
logger.Tracef("pgWorker %p set idle timeout to %s", w, IdleTime)
idle = time.NewTimer(IdleTime)
defer idle.Stop()
}
for {
logger.Tracef("waiting...")
select {
case <-w.catacomb.Dying():
return w.catacomb.ErrDying()
case <-idle.C:
logger.Tracef("pgWorker %p is idle", w)
w.idleFunc()
idle.Reset(IdleTime)
continue
case <-controllerChanges:
// A controller was added or removed.
logger.Tracef("<-controllerChanges")
changed, err := w.updateControllerNodes()
if err != nil {
return errors.Trace(err)
}
if !changed {
continue
}
logger.Tracef("controller added or removed, update replica now")
case <-w.controllerChanges:
// One of the controller nodes changed.
logger.Tracef("<-w.controllerChanges")
case <-configChanges:
// Controller config has changed.
logger.Tracef("<-w.configChanges")
// If a config change wakes up the loop before the topology has
// been represented in the worker's controller trackers, ignore it;
// errors will occur when trying to determine peer group changes.
// Continuing is OK because subsequent invocations of the loop will
// pick up the most recent config from state anyway.
if len(w.controllerTrackers) == 0 {
logger.Tracef("no controller information, ignoring config change")
continue
}
case requester := <-w.detailsRequests:
// A client requested the details be resent (probably
// because they just subscribed).
logger.Tracef("<-w.detailsRequests (from %q)", requester)
_, _ = w.config.Hub.Publish(apiserver.DetailsTopic, w.serverDetails)
continue
case <-updateChan:
// Scheduled update.
logger.Tracef("<-updateChan")
updateChan = nil
if w.config.UpdateNotify != nil {
w.config.UpdateNotify()
}
}
servers := w.apiServerHostPorts()
apiHostPorts := make([]network.SpaceHostPorts, 0, len(servers))
for _, serverHostPorts := range servers {
apiHostPorts = append(apiHostPorts, serverHostPorts)
}
var failed bool
if err := w.config.APIHostPortsSetter.SetAPIHostPorts(apiHostPorts); err != nil {
logger.Errorf("cannot write API server addresses: %v", err)
failed = true
}
members, err := w.updateReplicaSet()
if err != nil {
if errors.Is(err, replicaSetError) {
logger.Errorf("cannot set replicaset: %v", err)
} else if !errors.Is(err, stepDownPrimaryError) {
return errors.Trace(err)
} else {
logger.Tracef("isStepDownPrimary error: %v", err)
}
// both replicaset errors and stepping down the primary are both considered fast-retry 'failures'.
// we need to re-read the state after a short timeout and re-evaluate the replicaset.
failed = true
}
w.publishAPIServerDetails(servers, members)
if failed {
logger.Tracef("failed, will wake up after: %v", retryInterval)
updateChan = w.config.Clock.After(retryInterval)
retryInterval = scaleRetry(retryInterval)
} else {
// Update the replica set members occasionally to keep them up to
// date with the current replica-set member statuses.
// If we had previously failed to update the replicaset,
// the updateChan isn't set to the pollInterval. So if we had just
// processed an update, or have just succeeded after a failure reset
// the updateChan to the pollInterval.
if updateChan == nil || retryInterval != initialRetryInterval {
logger.Tracef("succeeded, will wake up after: %v", pollInterval)
updateChan = w.config.Clock.After(pollInterval)
} else {
logger.Tracef("succeeded, wait already pending")
}
retryInterval = initialRetryInterval
}
if w.idleFunc != nil {
idle.Reset(IdleTime)
}
}
}
func scaleRetry(value time.Duration) time.Duration {
value *= 2
if value > maxRetryInterval {
value = maxRetryInterval
}
return value
}
// watchForControllerChanges starts two watchers for changes to controller
// info and status.
// It returns a channel which will receive events if any of the watchers fires.
func (w *pgWorker) watchForControllerChanges() (<-chan struct{}, error) {
controllerInfoWatcher := w.config.State.WatchControllerInfo()
if err := w.catacomb.Add(controllerInfoWatcher); err != nil {
return nil, errors.Trace(err)
}
controllerStatusWatcher := w.config.State.WatchControllerStatusChanges()
if err := w.catacomb.Add(controllerStatusWatcher); err != nil {
return nil, errors.Trace(err)
}
out := make(chan struct{})
var notifyCh chan struct{}
go func() {
for {
select {
case <-w.catacomb.Dying():
return
case <-controllerInfoWatcher.Changes():
notifyCh = out
case <-controllerStatusWatcher.Changes():
notifyCh = out
case notifyCh <- struct{}{}:
notifyCh = nil
}
}
}()
return out, nil
}
// watchForConfigChanges starts a watcher for changes to controller config.
// It returns a channel which will receive events if the watcher fires.
// This is separate from watchForControllerChanges because of the worker loop
// logic. If controller nodes have not changed, then further processing
// does not occur, whereas we want to re-publish API addresses and check
// for replica-set changes if either the management or HA space configs have
// changed.
func (w *pgWorker) watchForConfigChanges() (<-chan struct{}, error) {
controllerConfigWatcher := w.config.State.WatchControllerConfig()
if err := w.catacomb.Add(controllerConfigWatcher); err != nil {
return nil, errors.Trace(err)
}
return controllerConfigWatcher.Changes(), nil
}
// updateControllerNodes updates the peergrouper's current list of
// controller nodes, as well as starting and stopping trackers for
// them as they are added and removed.
func (w *pgWorker) updateControllerNodes() (bool, error) {
controllerIds, err := w.config.State.ControllerIds()
if err != nil {
return false, fmt.Errorf("cannot get controller ids: %v", err)
}
logger.Debugf("controller nodes in state: %#v", controllerIds)
changed := false
// Stop controller goroutines that no longer correspond to controller nodes.
for _, m := range w.controllerTrackers {
if !inStrings(m.Id(), controllerIds) {
_ = worker.Stop(m)
delete(w.controllerTrackers, m.Id())
changed = true
}
}
// Start nodes with no watcher
for _, id := range controllerIds {
controllerNode, err := w.config.State.ControllerNode(id)
if err != nil {
if errors.IsNotFound(err) {
// If the controller isn't found, it must have been
// removed and will soon enough be removed
// from the controller list. This will probably
// never happen, but we'll code defensively anyway.
logger.Warningf("controller %q from controller list not found", id)
continue
}
return false, fmt.Errorf("cannot get controller %q: %v", id, err)
}
controllerHost, err := w.config.State.ControllerHost(id)
if err != nil {
if errors.IsNotFound(err) {
// If the controller isn't found, it must have been
// removed and will soon enough be removed
// from the controller list. This will probably
// never happen, but we'll code defensively anyway.
logger.Warningf("controller %q from controller list not found", id)
continue
}
return false, fmt.Errorf("cannot get controller %q: %v", id, err)
}
if _, ok := w.controllerTrackers[id]; ok {
continue
}
logger.Debugf("found new controller %q", id)
tracker, err := newControllerTracker(controllerNode, controllerHost, w.controllerChanges)
if err != nil {
return false, errors.Trace(err)
}
if err := w.catacomb.Add(tracker); err != nil {
return false, errors.Trace(err)
}
w.controllerTrackers[id] = tracker
changed = true
}
return changed, nil
}
func (w *pgWorker) apiserverDetailsRequested(topic string, request apiserver.DetailsRequest, err error) {
if err != nil {
// This shouldn't happen (barring programmer error ;) - treat it as fatal.
w.catacomb.Kill(errors.Annotate(err, "apiserver details request callback failed"))
return
}
select {
case w.detailsRequests <- request.Requester:
case <-w.catacomb.Dying():
}
}
func inStrings(t string, ss []string) bool {
for _, s := range ss {
if s == t {
return true
}
}
return false
}
// apiServerHostPorts returns the host-ports for each apiserver controller.
func (w *pgWorker) apiServerHostPorts() map[string]network.SpaceHostPorts {
servers := make(map[string]network.SpaceHostPorts)
for _, m := range w.controllerTrackers {
hostPorts := network.SpaceAddressesWithPort(m.Addresses(), w.config.APIPort)
if len(hostPorts) == 0 {
continue
}
servers[m.Id()] = hostPorts
}
return servers
}
// publishAPIServerDetails publishes the details corresponding to the latest
// known controller/replica-set topology if it has changed from the last known
// state.
func (w *pgWorker) publishAPIServerDetails(
servers map[string]network.SpaceHostPorts,
members map[string]*replicaset.Member,
) {
details := apiserver.Details{
Servers: make(map[string]apiserver.APIServer),
LocalOnly: true,
}
internalPort := w.config.ControllerAPIPort
if internalPort == 0 {
internalPort = w.config.APIPort
}
for id, hostPorts := range servers {
var internalAddress string
if members[id] != nil {
mongoAddress, _, err := net.SplitHostPort(members[id].Address)
if err != nil {
logger.Errorf("splitting host/port for address %q: %v", members[id].Address, err)
} else {
internalAddress = net.JoinHostPort(mongoAddress, strconv.Itoa(internalPort))
}
} else {
logger.Tracef("replica-set member %q not found", id)
}
server := apiserver.APIServer{
ID: id,
InternalAddress: internalAddress,
}
for _, hp := range hostPorts.HostPorts().FilterUnusable() {
server.Addresses = append(server.Addresses, network.DialAddress(hp))
}
sort.Strings(server.Addresses)
details.Servers[server.ID] = server
}
if !reflect.DeepEqual(w.serverDetails, details) {
_, _ = w.config.Hub.Publish(apiserver.DetailsTopic, details)
w.serverDetails = details
}
}
// replicaSetError means an error occurred as a result
// of calling replicaset.Set. As this is expected to fail
// in the normal course of things, it needs special treatment.
const replicaSetError = errors.ConstError("replicaset error")
// stepDownPrimaryError means we needed to ask the primary to step down, so we should come back and re-evaluate the
// replicaset once the new primary is voted in
const stepDownPrimaryError = errors.ConstError("primary is stepping down, must reevaluate peer group")
// updateReplicaSet sets the current replica set members, and applies the
// given voting status to nodes in the state. A mapping of controller ID
// to replicaset.Member structures is returned.
func (w *pgWorker) updateReplicaSet() (map[string]*replicaset.Member, error) {
info, err := w.peerGroupInfo()
if err != nil {
return nil, errors.Annotate(err, "creating peer group info")
}
// Update the metrics collector with the replicaset statuses.
w.metrics.update(info.statuses)
desired, err := desiredPeerGroup(info)
// membersChanged, members, voting, err
if err != nil {
return nil, errors.Annotate(err, "computing desired peer group")
}
if logger.IsDebugEnabled() {
if desired.isChanged {
logger.Debugf("desired peer group members: \n%s", prettyReplicaSetMembers(desired.members))
} else {
var output []string
for id, m := range desired.members {
output = append(output, fmt.Sprintf(" %s: %v", id, isVotingMember(m)))
}
logger.Debugf("no change in desired peer group, voting: \n%s", strings.Join(output, "\n"))
}
}
if desired.stepDownPrimary {
logger.Infof("mongo primary controller needs to be removed, first requesting it to step down")
if err := w.config.MongoSession.StepDownPrimary(); err != nil {
// StepDownPrimary should have already handled the io.EOF that mongo might give, so any error we
// get is unknown
return nil, errors.Annotate(err, "asking primary to step down")
}
// Asking the Primary to step down forces us to disconnect from Mongo, but session.Refresh() should get us
// reconnected so we can keep operating
w.config.MongoSession.Refresh()
// However, we no longer know who the primary is, so we have to error out and have it reevaluated
return nil, stepDownPrimaryError
}
// Figure out if we are running on the mongo primary.
controllerId := w.config.ControllerId()
isPrimary, err := info.isPrimary(controllerId)
if err != nil && !errors.IsNotFound(err) {
return nil, errors.Annotatef(err, "determining primary status of controller %q", controllerId)
}
logger.Debugf("controller node %q primary: %v", controllerId, isPrimary)
if !isPrimary {
return desired.members, nil
}
// Currently k8s controllers do not support HA, so only update
// the replicaset config if HA is enabled and there is a change.
// Only controllers corresponding with the mongo primary should
// update the replicaset, otherwise there will be a race since
// a diff needs to be calculated so the changes can be applied
// one at a time.
if w.config.SupportsHA && desired.isChanged {
ms := make([]replicaset.Member, 0, len(desired.members))
ids := make([]string, 0, len(desired.members))
for id := range desired.members {
ids = append(ids, id)
}
sortAsInts(ids)
for _, id := range ids {
m := desired.members[id]
ms = append(ms, *m)
}
if err := w.config.MongoSession.Set(ms); err != nil {
return nil, errors.WithType(err, replicaSetError)
}
logger.Infof("successfully updated replica set")
}
// Reset controller status for members of the changed peer-group.
// Any previous peer-group determination errors result in status
// warning messages.
for id := range desired.members {
if err := w.controllerTrackers[id].host.SetStatus(getStatusInfo("")); err != nil {
return nil, errors.Trace(err)
}
}
if err := w.updateVoteStatus(); err != nil {
return nil, errors.Trace(err)
}
for _, tracker := range w.controllerTrackers {
if tracker.host.Life() != state.Alive && !tracker.node.HasVote() {
logger.Debugf("removing dying controller %s references", tracker.Id())
if err := w.config.State.RemoveControllerReference(tracker.node); err != nil {
logger.Errorf("failed to remove dying controller as a controller after removing its vote: %v", err)
}
}
}
return desired.members, nil
}
func (w *pgWorker) updateVoteStatus() error {
currentMembers, err := w.config.MongoSession.CurrentMembers()
if err != nil {
return errors.Trace(err)
}
orphanedNodes := set.NewStrings()
for id := range w.controllerTrackers {
orphanedNodes.Add(id)
}
var voting, nonVoting []*controllerTracker
for _, m := range currentMembers {
node, ok := w.controllerTrackers[m.Tags[jujuNodeKey]]
orphanedNodes.Remove(node.Id())
if ok {
if !node.HasVote() && isVotingMember(&m) {
logger.Tracef("controller %v is now voting member", node.Id())
voting = append(voting, node)
} else if node.HasVote() && !isVotingMember(&m) {
logger.Tracef("controller %v is now non voting member", node.Id())
nonVoting = append(nonVoting, node)
}
}
}
logger.Debugf("controllers that are no longer in replicaset: %v", orphanedNodes.Values())
for _, id := range orphanedNodes.Values() {
node := w.controllerTrackers[id]
nonVoting = append(nonVoting, node)
}
if err := setHasVote(voting, true); err != nil {
return errors.Annotatef(err, "adding voters")
}
if err := setHasVote(nonVoting, false); err != nil {
return errors.Annotatef(err, "removing non-voters")
}
return nil
}
const (
voting = "voting"
nonvoting = "non-voting"
)
func prettyReplicaSetMembers(members map[string]*replicaset.Member) string {
var result []string
// It's easier to read if we sort by Id.
keys := make([]string, 0, len(members))
for key := range members {
keys = append(keys, key)
}
sort.Strings(keys)
for _, key := range keys {
m := members[key]
voteStatus := nonvoting
if isVotingMember(m) {
voteStatus = voting
}
result = append(result, fmt.Sprintf(" Id: %d, Tags: %v, %s", m.Id, m.Tags, voteStatus))
}
return strings.Join(result, "\n")
}
// peerGroupInfo collates current session information about the
// mongo peer group with information from state node instances.
func (w *pgWorker) peerGroupInfo() (*peerGroupInfo, error) {
sts, err := w.config.MongoSession.CurrentStatus()
if err != nil {
return nil, errors.Annotate(err, "cannot get replica set status")
}
members, err := w.config.MongoSession.CurrentMembers()
if err != nil {
return nil, errors.Annotate(err, "cannot get replica set members")
}
haSpace, err := w.getHASpaceFromConfig()
if err != nil {
return nil, err
}
if logger.IsTraceEnabled() {
logger.Tracef("read peer group info: %# v\n%# v", pretty.Formatter(sts), pretty.Formatter(members))
}
return newPeerGroupInfo(w.controllerTrackers, sts.Members, members, w.config.MongoPort, haSpace)
}
// getHASpaceFromConfig returns a space based on the controller's
// configuration for the HA space.
func (w *pgWorker) getHASpaceFromConfig() (network.SpaceInfo, error) {
config, err := w.config.State.ControllerConfig()
if err != nil {
return network.SpaceInfo{}, errors.Trace(err)
}
jujuHASpace := config.JujuHASpace()
if jujuHASpace == "" {
return network.SpaceInfo{}, nil
}
space, err := w.config.State.Space(jujuHASpace)
if err != nil {
return network.SpaceInfo{}, errors.Trace(err)
}
return space.NetworkSpace()
}
// setHasVote sets the HasVote status of all the given nodes to hasVote.
func setHasVote(ms []*controllerTracker, hasVote bool) error {
if len(ms) == 0 {
return nil
}
logger.Infof("setting HasVote=%v on nodes %v", hasVote, ms)
for _, m := range ms {
if err := m.node.SetHasVote(hasVote); err != nil {
return fmt.Errorf("cannot set voting status of %q to %v: %v", m.Id(), hasVote, err)
}
}
return nil
}