/
manager.go
413 lines (337 loc) · 10.7 KB
/
manager.go
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package manifest
import (
"bytes"
"context"
"encoding/hex"
"fmt"
"time"
"github.com/virtengine/virtengine/provider/cluster"
"github.com/virtengine/virtengine/provider/cluster/util"
"github.com/pkg/errors"
"github.com/tendermint/tendermint/libs/log"
lifecycle "github.com/boz/go-lifecycle"
"github.com/virtengine/virtengine/manifest"
"github.com/virtengine/virtengine/provider/event"
"github.com/virtengine/virtengine/provider/session"
"github.com/virtengine/virtengine/pubsub"
"github.com/virtengine/virtengine/sdl"
"github.com/virtengine/virtengine/util/runner"
"github.com/virtengine/virtengine/validation"
dtypes "github.com/virtengine/virtengine/x/deployment/types"
mtypes "github.com/virtengine/virtengine/x/market/types"
)
var (
// ErrShutdownTimerExpired for a terminating deployment
ErrShutdownTimerExpired = errors.New("shutdown timer expired")
// ErrManifestVersion indicates that the given manifest's version does not
// match the blockchain Version value.
ErrManifestVersion = errors.New("manifest version validation failed")
ErrNoManifestForDeployment = errors.New("manifest not yet received for that deployment")
ErrNoLeaseForDeployment = errors.New("no lease for deployment")
)
func newManager(h *service, daddr dtypes.DeploymentID) *manager {
session := h.session.ForModule("manifest-manager")
m := &manager{
daddr: daddr,
session: session,
bus: h.bus,
leasech: make(chan event.LeaseWon),
rmleasech: make(chan mtypes.LeaseID),
manifestch: make(chan manifestRequest),
updatech: make(chan []byte),
log: session.Log().With("deployment", daddr),
lc: lifecycle.New(),
config: h.config,
hostnameService: h.hostnameService,
}
go m.lc.WatchChannel(h.lc.ShuttingDown())
go m.run(h.managerch)
return m
}
// 'manager' facilitates operations around a configured Deployment.
type manager struct {
config ServiceConfig
daddr dtypes.DeploymentID
session session.Session
bus pubsub.Bus
leasech chan event.LeaseWon
rmleasech chan mtypes.LeaseID
manifestch chan manifestRequest
updatech chan []byte
data *dtypes.QueryDeploymentResponse
requests []manifestRequest
pendingRequests []chan<- error
leases []event.LeaseWon
manifests []*manifest.Manifest
versions [][]byte
stoptimer *time.Timer
log log.Logger
lc lifecycle.Lifecycle
hostnameService cluster.HostnameServiceClient
}
func (m *manager) stop() {
m.lc.ShutdownAsync(nil)
}
func (m *manager) handleLease(ev event.LeaseWon) {
select {
case m.leasech <- ev:
case <-m.lc.ShuttingDown():
m.log.Error("not running: handle manifest", "lease", ev.LeaseID)
}
}
func (m *manager) removeLease(id mtypes.LeaseID) {
select {
case m.rmleasech <- id:
case <-m.lc.ShuttingDown():
m.log.Error("not running: remove lease", "lease", id)
}
}
func (m *manager) handleManifest(req manifestRequest) {
select {
case m.manifestch <- req:
case <-m.lc.ShuttingDown():
m.log.Error("not running: handle manifest")
req.ch <- ErrNotRunning
}
}
func (m *manager) handleUpdate(version []byte) {
select {
case m.updatech <- version:
case <-m.lc.ShuttingDown():
m.log.Error("not running: version update", "version", hex.EncodeToString(version))
}
}
func (m *manager) run(donech chan<- *manager) {
defer m.lc.ShutdownCompleted()
defer func() { donech <- m }()
var runch <-chan runner.Result
ctx, cancel := context.WithCancel(context.Background())
loop:
for {
var stopch <-chan time.Time
if m.stoptimer != nil {
stopch = m.stoptimer.C
}
select {
case err := <-m.lc.ShutdownRequest():
m.lc.ShutdownInitiated(err)
break loop
case <-stopch:
m.log.Error(ErrShutdownTimerExpired.Error())
m.lc.ShutdownInitiated(ErrShutdownTimerExpired)
break loop
case ev := <-m.leasech:
m.log.Info("new lease", "lease", ev.LeaseID)
m.leases = append(m.leases, ev)
m.emitReceivedEvents()
m.maybeScheduleStop()
runch = m.maybeFetchData(ctx, runch)
case id := <-m.rmleasech:
m.log.Info("lease removed", "lease", id)
for idx, lease := range m.leases {
if id.Equals(lease.LeaseID) {
m.leases = append(m.leases[:idx], m.leases[idx+1:]...)
}
}
m.maybeScheduleStop()
case req := <-m.manifestch:
m.log.Info("manifest received")
m.requests = append(m.requests, req)
m.validateRequests()
m.emitReceivedEvents()
m.maybeScheduleStop()
runch = m.maybeFetchData(ctx, runch)
case version := <-m.updatech:
m.log.Info("received version", "version", hex.EncodeToString(version))
m.versions = append(m.versions, version)
if m.data != nil {
m.data.Deployment.Version = version
}
case result := <-runch:
runch = nil
if err := result.Error(); err != nil {
m.log.Error("error fetching data", "err", err)
// Fetching data failed, all requests are now in an error state
m.fillAllRequests(err)
break
}
m.data = result.Value().(*dtypes.QueryDeploymentResponse)
m.log.Info("data received", "version", hex.EncodeToString(m.data.Deployment.Version))
m.validateRequests()
m.emitReceivedEvents()
m.maybeScheduleStop()
}
}
cancel()
m.fillAllRequests(ErrNotRunning)
if m.stoptimer != nil {
if m.stoptimer.Stop() {
<-m.stoptimer.C
}
}
if runch != nil {
<-runch
}
}
func (m *manager) maybeFetchData(ctx context.Context, runch <-chan runner.Result) <-chan runner.Result {
if m.data == nil && runch == nil {
return m.fetchData(ctx)
}
return runch
}
func (m *manager) fetchData(ctx context.Context) <-chan runner.Result {
return runner.Do(func() runner.Result {
// TODO: retry
return runner.NewResult(m.doFetchData(ctx))
})
}
func (m *manager) doFetchData(ctx context.Context) (*dtypes.QueryDeploymentResponse, error) {
res, err := m.session.Client().Query().Deployment(ctx, &dtypes.QueryDeploymentRequest{ID: m.daddr})
if err != nil {
return nil, err
}
return res, nil
}
func (m *manager) maybeScheduleStop() bool { // nolint:golint,unparam
if len(m.leases) > 0 || len(m.manifests) > 0 {
if m.stoptimer != nil {
m.log.Info("stopping stop timer")
if m.stoptimer.Stop() {
<-m.stoptimer.C
}
m.stoptimer = nil
}
return false
}
if m.stoptimer != nil {
const manifestLingerDuration = time.Minute * time.Duration(5)
m.log.Info("starting stop timer", "duration", manifestLingerDuration)
m.stoptimer = time.NewTimer(manifestLingerDuration)
}
return true
}
func (m *manager) fillAllRequests(response error) {
for _, reqch := range m.pendingRequests {
reqch <- response
}
m.pendingRequests = nil
for _, req := range m.requests {
req.ch <- response
}
m.requests = nil
}
func (m *manager) emitReceivedEvents() {
if len(m.leases) == 0 {
m.log.Debug("emit received events skips due to no leases", "data", m.data, "leases", len(m.leases), "manifests", len(m.manifests))
m.fillAllRequests(ErrNoLeaseForDeployment)
return
}
if m.data == nil || len(m.manifests) == 0 {
m.log.Debug("emit received events skipped", "data", m.data, "leases", len(m.leases), "manifests", len(m.manifests))
return
}
manifest := m.manifests[len(m.manifests)-1]
m.log.Debug("publishing manifest received", "num-leases", len(m.leases))
for _, lease := range m.leases {
m.log.Debug("publishing manifest received for lease", "lease_id", lease.LeaseID)
if err := m.bus.Publish(event.ManifestReceived{
LeaseID: lease.LeaseID,
Group: lease.Group,
Manifest: manifest,
Deployment: m.data,
}); err != nil {
m.log.Error("publishing event", "err", err, "lease", lease.LeaseID)
}
}
// A manifest has been published, satisfy all pending requests
for _, reqch := range m.pendingRequests {
reqch <- nil
}
m.pendingRequests = nil
}
func (m *manager) validateRequests() {
if m.data == nil || len(m.requests) == 0 {
return
}
manifests := make([]*manifest.Manifest, 0)
for _, req := range m.requests {
if err := m.validateRequest(req); err != nil {
m.log.Error("invalid manifest", "err", err)
req.ch <- err
continue
}
manifests = append(manifests, &req.value.Manifest)
// The manifest has been grabbed from the request but not published yet, store this response
m.pendingRequests = append(m.pendingRequests, req.ch)
}
m.requests = nil
m.log.Debug("requests valid", "num-requests", len(manifests))
if len(manifests) > 0 {
// XXX: only one version means only one valid manifest
m.manifests = append(m.manifests, manifests[0])
}
}
var errManifestRejected = errors.New("manifest rejected")
func (m *manager) checkHostnamesForManifest(requestManifest manifest.Manifest, groupNames []string) error {
allHostnames := make([]string, 0)
for _, mgroup := range requestManifest.GetGroups() {
for _, groupName := range groupNames {
// Only check leases with a matching deployment ID & group name
if groupName != mgroup.GetName() {
continue
}
allHostnames = append(allHostnames, util.AllHostnamesOfManifestGroup(mgroup)...)
if !m.config.HTTPServicesRequireAtLeastOneHost {
continue
}
// For each service that exposes via an Ingress, then require a hsotname
for _, service := range mgroup.Services {
for _, expose := range service.Expose {
if util.ShouldBeIngress(expose) && len(expose.Hosts) == 0 {
return fmt.Errorf("%w: service %q exposed on %d:%s must have a hostname", errManifestRejected, service.Name, util.ExposeExternalPort(expose), expose.Proto)
}
}
}
}
}
// Check if the hostnames are available. Do not block forever
select {
case err := <-m.hostnameService.CanReserveHostnames(allHostnames, m.data.Deployment.DeploymentID):
return err
case <-m.lc.ShutdownRequest():
return ErrNotRunning
}
}
func (m *manager) validateRequest(req manifestRequest) error {
// ensure that an uploaded manifest matches the hash declared on
// the VirtEngine Deployment.Version
version, err := sdl.ManifestVersion(req.value.Manifest)
if err != nil {
return err
}
var versionExpected []byte
if len(m.versions) != 0 {
versionExpected = m.versions[len(m.versions)-1]
} else {
versionExpected = m.data.Deployment.Version
}
if !bytes.Equal(version, versionExpected) {
m.log.Info("deployment version mismatch", "expected", m.data.Deployment.Version, "got", version)
return ErrManifestVersion
}
if err := validation.ValidateManifest(req.value.Manifest); err != nil {
return err
}
if err := validation.ValidateManifestWithDeployment(&req.value.Manifest, m.data.Groups); err != nil {
return err
}
groupNames := make([]string, 0)
for _, lease := range m.leases {
groupNames = append(groupNames, lease.Group.GroupSpec.Name)
}
// Check that hostnames are not in use
if err := m.checkHostnamesForManifest(req.value.Manifest, groupNames); err != nil {
return err
}
return nil
}