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rolloutImage.go
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rolloutImage.go
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package main
import (
"fmt"
"io"
"math"
"net"
"os"
"os/exec"
"path"
"path/filepath"
"sync"
"syscall"
"time"
imageclient "github.com/Cloud-Foundations/Dominator/imageserver/client"
"github.com/Cloud-Foundations/Dominator/lib/concurrent"
"github.com/Cloud-Foundations/Dominator/lib/constants"
"github.com/Cloud-Foundations/Dominator/lib/cpusharer"
"github.com/Cloud-Foundations/Dominator/lib/errors"
"github.com/Cloud-Foundations/Dominator/lib/format"
"github.com/Cloud-Foundations/Dominator/lib/json"
"github.com/Cloud-Foundations/Dominator/lib/log"
"github.com/Cloud-Foundations/Dominator/lib/log/prefixlogger"
libnet "github.com/Cloud-Foundations/Dominator/lib/net"
"github.com/Cloud-Foundations/Dominator/lib/rpcclientpool"
"github.com/Cloud-Foundations/Dominator/lib/srpc"
"github.com/Cloud-Foundations/Dominator/lib/tags"
fm_proto "github.com/Cloud-Foundations/Dominator/proto/fleetmanager"
hyper_proto "github.com/Cloud-Foundations/Dominator/proto/hypervisor"
sub_proto "github.com/Cloud-Foundations/Dominator/proto/sub"
subclient "github.com/Cloud-Foundations/Dominator/sub/client"
"github.com/Cloud-Foundations/tricorder/go/tricorder/messages"
)
const (
filePerms = syscall.S_IRUSR | syscall.S_IWUSR | syscall.S_IRGRP |
syscall.S_IROTH
)
type hypervisorType struct {
alreadyUpdated bool
healthAgentClientResource *rpcclientpool.ClientResource
hostname string
hypervisorClientResource *srpc.ClientResource
initialTags tags.Tags
initialUnhealthyList map[string]struct{}
logger log.DebugLogger
noVMs bool
subClientResource *srpc.ClientResource
}
func rolloutImageSubcommand(args []string, logger log.DebugLogger) error {
err := rolloutImage(args[0], logger)
if err != nil {
return fmt.Errorf("error rolling out image: %s", err)
}
return nil
}
func checkCertificates(predictedDuration time.Duration) error {
predictedFinish := time.Now().Add(predictedDuration)
if srpc.GetEarliestClientCertExpiration().Before(predictedFinish) {
return fmt.Errorf("a certificate expires before: %s", predictedFinish)
}
return nil
}
func extendImageLifetime(imageServerClientResource *srpc.ClientResource,
imageName string, expiresAt time.Time, predictedDuration time.Duration,
logger log.DebugLogger) error {
if expiresAt.IsZero() {
return nil
}
if time.Until(expiresAt) >= predictedDuration {
return nil
}
newExpiration := time.Now().Add(predictedDuration)
logger.Debugf(0, "extending image lifetime by %s\n",
format.Duration(time.Until(newExpiration)))
client, err := imageServerClientResource.GetHTTP(nil, 0)
if err != nil {
return err
}
defer client.Put()
return imageclient.ChangeImageExpiration(client, imageName, newExpiration)
}
func gitCommand(repositoryDirectory string, command ...string) ([]byte, error) {
cmd := exec.Command("git", command...)
cmd.Dir = repositoryDirectory
cmd.Stderr = os.Stderr
if output, err := cmd.Output(); err != nil {
return nil, fmt.Errorf("error running git %v: %s", cmd.Args, err)
} else {
return output, nil
}
}
func rolloutImage(imageName string, logger log.DebugLogger) error {
startTime := time.Now()
cpuSharer := cpusharer.NewFifoCpuSharer()
if *topologyDir != "" {
logger.Debugln(0, "updating Git repository")
stdout, err := gitCommand(*topologyDir, "status", "--porcelain")
if err != nil {
return err
}
if len(stdout) > 0 {
return errors.New("Git repository is not clean")
}
if _, err := gitCommand(*topologyDir, "pull"); err != nil {
return err
}
}
logger.Debugln(0, "checking image")
imageServerClientResource := srpc.NewClientResource("tcp",
fmt.Sprintf("%s:%d", *imageServerHostname, *imageServerPortNum))
defer imageServerClientResource.ScheduleClose()
expiresAt, err := checkImage(imageServerClientResource, imageName)
if err != nil {
return err
}
fleetManagerClientResource := srpc.NewClientResource("tcp",
fmt.Sprintf("%s:%d", *fleetManagerHostname, *fleetManagerPortNum))
defer fleetManagerClientResource.ScheduleClose()
logger.Debugln(0, "finding good Hypervisors")
hypervisorAddresses, err := listConnectedHypervisors(
fleetManagerClientResource)
if err != nil {
return err
}
hypervisors := make([]*hypervisorType, 0, len(hypervisorAddresses))
defer closeHypervisors(hypervisors)
tagsForHypervisors, err := getTagsForHypervisors(fleetManagerClientResource)
logger.Debugln(0, "checking and tagging Hypervisors")
if err != nil {
return fmt.Errorf("failure getting tags: %s", err)
}
hypervisorsChannel := make(chan *hypervisorType, len(hypervisorAddresses))
for _, address := range hypervisorAddresses {
if hostname, _, err := net.SplitHostPort(address); err != nil {
return err
} else {
go func(hostname string) {
cpuSharer.GrabCpu()
defer cpuSharer.ReleaseCpu()
hypervisor := setupHypervisor(hostname, imageName,
tagsForHypervisors[hostname], cpuSharer, logger)
hypervisorsChannel <- hypervisor
}(hostname)
}
}
numAlreadyUpdated := 0
for range hypervisorAddresses {
if hypervisor := <-hypervisorsChannel; hypervisor != nil {
if hypervisor.alreadyUpdated {
numAlreadyUpdated++
continue
}
err := hypervisor.updateTagForHypervisor(
fleetManagerClientResource, "PlannedImage", imageName)
if err != nil {
return fmt.Errorf("%s: failure updating tags: %s",
hypervisor.hostname, err)
}
hypervisors = append(hypervisors, hypervisor)
}
}
if numAlreadyUpdated == len(hypervisorAddresses) {
return releaseImage(imageServerClientResource, imageName, expiresAt,
logger)
}
if len(hypervisors) < 1 {
return errors.New("no hypervisors to update")
}
logger.Debugln(0, "splitting unused/used Hypervisors")
unusedHypervisors, usedHypervisors := markUnusedHypervisors(hypervisors,
cpuSharer)
logger.Debugf(0, "%d unused, %d used Hypervisors\n",
len(unusedHypervisors), len(usedHypervisors))
numSteps := math.Sqrt(float64(len(unusedHypervisors)*2)) +
math.Sqrt(float64(len(usedHypervisors)*2))
predictedDuration := time.Minute * 5 * time.Duration(numSteps)
if err := checkCertificates(predictedDuration); err != nil {
return err
}
err = extendImageLifetime(imageServerClientResource, imageName, expiresAt,
predictedDuration, logger)
if err != nil {
return err
}
logger.Debugln(0, "upgrading unused Hypervisors")
err = upgradeOneThenAll(fleetManagerClientResource, imageName,
unusedHypervisors, cpuSharer, uint(len(unusedHypervisors)))
if err != nil {
return err
}
numConcurrent := uint(len(usedHypervisors) / 2)
if numConcurrent < 1 {
numConcurrent = 1
} else if numConcurrent > uint(len(unusedHypervisors)) {
numConcurrent = 1
} else if numConcurrent*10 < uint(len(usedHypervisors)) {
numConcurrent++
}
logger.Debugln(0, "upgrading used Hypervisors")
err = upgradeOneThenAll(fleetManagerClientResource, imageName,
usedHypervisors, cpuSharer, numConcurrent)
if err != nil {
return err
}
err = releaseImage(imageServerClientResource, imageName, expiresAt, logger)
if err != nil {
return err
}
if *topologyDir != "" {
var tgs tags.Tags
tagsFilename := filepath.Join(*topologyDir, *location, "tags.json")
if err := json.ReadFromFile(tagsFilename, &tgs); err != nil {
if !os.IsNotExist(err) {
return err
}
tgs = make(tags.Tags)
}
oldImageName := tgs["RequiredImage"]
tgs["RequiredImage"] = imageName
delete(tgs, "PlannedImage")
err := json.WriteToFile(tagsFilename, filePerms, " ", tgs)
if err != nil {
return err
}
if _, err := gitCommand(*topologyDir, "add", tagsFilename); err != nil {
return err
}
var locationInsert string
if *location != "" {
locationInsert = "in " + *location + " "
}
_, err = gitCommand(*topologyDir, "commit", "-m",
fmt.Sprintf("Upgrade %sfrom %s to %s",
locationInsert, oldImageName, imageName))
if err != nil {
return err
}
if _, err := gitCommand(*topologyDir, "push"); err != nil {
return err
}
}
logger.Printf("rollout completed in %s\n",
format.Duration(time.Since(startTime)))
return nil
}
func checkImage(imageServerClientResource *srpc.ClientResource,
imageName string) (time.Time, error) {
client, err := imageServerClientResource.GetHTTP(nil, 0)
if err != nil {
return time.Time{}, err
}
defer client.Put()
expiresAt, err := imageclient.GetImageExpiration(client, imageName)
if err != nil {
return time.Time{}, err
}
if expiresAt.IsZero() {
return expiresAt, nil
}
return expiresAt,
imageclient.ChangeImageExpiration(client, imageName, expiresAt)
}
func closeHypervisors(hypervisors []*hypervisorType) {
for _, hypervisor := range hypervisors {
hypervisor.hypervisorClientResource.ScheduleClose()
hypervisor.subClientResource.ScheduleClose()
}
}
func getTagsForHypervisors(clientResource *srpc.ClientResource) (
map[string]tags.Tags, error) {
client, err := clientResource.GetHTTP(nil, 0)
if err != nil {
return nil, err
}
defer client.Close()
conn, err := client.Call("FleetManager.GetUpdates")
if err != nil {
return nil, err
}
defer conn.Close()
request := fm_proto.GetUpdatesRequest{Location: *location, MaxUpdates: 1}
if err := conn.Encode(request); err != nil {
return nil, err
}
if err := conn.Flush(); err != nil {
return nil, err
}
var reply fm_proto.Update
if err := conn.Decode(&reply); err != nil {
return nil, err
}
if err := errors.New(reply.Error); err != nil {
return nil, err
}
tagsForHypervisors := make(map[string]tags.Tags, len(reply.ChangedMachines))
for _, machine := range reply.ChangedMachines {
tagsForHypervisors[machine.Hostname] = machine.Tags
}
return tagsForHypervisors, nil
}
func listConnectedHypervisors(clientResource *srpc.ClientResource) (
[]string, error) {
return listConnectedHypervisorsInLocation(clientResource, *location)
}
func listConnectedHypervisorsInLocation(clientResource *srpc.ClientResource,
location string) ([]string, error) {
client, err := clientResource.GetHTTP(nil, 0)
if err != nil {
return nil, err
}
defer client.Put()
request := fm_proto.ListHypervisorsInLocationRequest{
IncludeUnhealthy: true,
Location: location,
}
var reply fm_proto.ListHypervisorsInLocationResponse
err = client.RequestReply("FleetManager.ListHypervisorsInLocation",
request, &reply)
if err != nil {
return nil, err
}
if err := errors.New(reply.Error); err != nil {
return nil, err
}
return reply.HypervisorAddresses, nil
}
func markUnusedHypervisors(hypervisors []*hypervisorType,
cpuSharer cpusharer.CpuSharer) (
map[*hypervisorType]struct{}, map[*hypervisorType]struct{}) {
dialer := libnet.NewCpuSharingDialer(&net.Dialer{}, cpuSharer)
waitGroup := &sync.WaitGroup{}
for _, hypervisor_ := range hypervisors {
waitGroup.Add(1)
go func(h *hypervisorType) {
defer waitGroup.Done()
cpuSharer.GrabCpu()
defer cpuSharer.ReleaseCpu()
client, err := h.hypervisorClientResource.GetHTTPWithDialer(nil,
dialer)
if err != nil {
h.logger.Printf("error connecting to hypervisor: %s\n", err)
return
}
defer client.Put()
request := hyper_proto.ListVMsRequest{
IgnoreStateMask: 1<<hyper_proto.StateFailedToStart |
1<<hyper_proto.StateStopping |
1<<hyper_proto.StateStopped |
1<<hyper_proto.StateDestroying,
}
var reply hyper_proto.ListVMsResponse
err = client.RequestReply("Hypervisor.ListVMs", request, &reply)
if err != nil {
h.logger.Printf("error listing VMS: %s", err)
return
}
if len(reply.IpAddresses) < 1 {
h.noVMs = true
}
}(hypervisor_)
}
waitGroup.Wait()
unusedHypervisors := make(map[*hypervisorType]struct{})
usedHypervisors := make(map[*hypervisorType]struct{})
for _, hypervisor := range hypervisors {
if hypervisor.noVMs {
unusedHypervisors[hypervisor] = struct{}{}
} else {
usedHypervisors[hypervisor] = struct{}{}
}
}
return unusedHypervisors, usedHypervisors
}
func releaseImage(imageServerClientResource *srpc.ClientResource,
imageName string, expiresAt time.Time, logger log.DebugLogger) error {
if expiresAt.IsZero() {
logger.Debugln(1, "image already released")
return nil
}
logger.Debugln(0, "releasing image")
client, err := imageServerClientResource.GetHTTP(nil, 0)
if err != nil {
return err
}
defer client.Put()
return imageclient.ChangeImageExpiration(client, imageName, time.Time{})
}
func setupHypervisor(hostname string, imageName string, tgs tags.Tags,
cpuSharer *cpusharer.FifoCpuSharer,
logger log.DebugLogger) *hypervisorType {
logger = prefixlogger.New(hostname+": ", logger)
currentRequiredImage := tgs["RequiredImage"]
if currentRequiredImage != "" &&
path.Dir(currentRequiredImage) != path.Dir(imageName) {
logger.Printf(
"image stream: current=%s != new=%s, skipping\n",
path.Dir(currentRequiredImage), path.Dir(imageName))
return nil
}
h := &hypervisorType{
healthAgentClientResource: rpcclientpool.New("tcp",
fmt.Sprintf("%s:%d", hostname, 6910), true, ""),
hostname: hostname,
hypervisorClientResource: srpc.NewClientResource("tcp",
fmt.Sprintf("%s:%d", hostname,
constants.HypervisorPortNumber)),
initialTags: tgs,
initialUnhealthyList: make(map[string]struct{}),
logger: logger,
subClientResource: srpc.NewClientResource("tcp",
fmt.Sprintf("%s:%d", hostname, constants.SubPortNumber)),
}
if lastImage, err := h.getLastImageName(cpuSharer); err != nil {
logger.Printf("skipping: %s\n", err)
return nil
} else if lastImage == imageName {
logger.Println("already updated, skipping")
h.alreadyUpdated = true
return h
} else {
return h
}
}
func upgradeOneThenAll(fleetManagerClientResource *srpc.ClientResource,
imageName string, hypervisors map[*hypervisorType]struct{},
cpuSharer *cpusharer.FifoCpuSharer, maxConcurrent uint) error {
if len(hypervisors) < 1 {
return nil
}
state := concurrent.NewStateWithLinearConcurrencyIncrease(1, maxConcurrent)
for hypervisor := range hypervisors {
hypervisor := hypervisor
err := state.GoRun(func() error {
err := hypervisor.upgrade(fleetManagerClientResource, imageName,
cpuSharer)
if err != nil {
return fmt.Errorf("error upgrading: %s: %s",
hypervisor.hostname, err)
}
return nil
})
if err != nil {
return err
}
}
return state.Reap()
}
func (h *hypervisorType) getFailingHealthChecks(
cpuSharer *cpusharer.FifoCpuSharer,
timeout time.Duration) ([]string, time.Time, error) {
stopTime := time.Now().Add(timeout)
for ; time.Until(stopTime) >= 0; cpuSharer.Sleep(time.Second) {
if list, timestamp, err := h.getFailingHealthChecksOnce(); err == nil {
return list, timestamp, nil
}
}
return nil, time.Time{}, errors.New("timed out getting health status")
}
func (h *hypervisorType) getFailingHealthChecksOnce() (
[]string, time.Time, error) {
client, err := h.healthAgentClientResource.Get(nil)
if err != nil {
return nil, time.Time{}, err
}
defer client.Put()
var metric messages.Metric
err = client.Call("MetricsServer.GetMetric",
"/health-checks/*/unhealthy-list", &metric)
if err != nil {
client.Close()
return nil, time.Time{}, err
}
if list, ok := metric.Value.([]string); !ok {
return nil, time.Time{}, errors.New("list metric is not []string")
} else {
if timestamp, ok := metric.TimeStamp.(time.Time); ok {
return list, timestamp, nil
} else {
return list, time.Time{}, nil
}
}
}
func (h *hypervisorType) getLastImageName(cpuSharer *cpusharer.FifoCpuSharer) (
string, error) {
client, err := h.subClientResource.GetHTTP(nil, time.Second*15)
if err != nil {
return "", fmt.Errorf("error connecting to sub: %s", err)
}
defer client.Put()
request := sub_proto.PollRequest{ShortPollOnly: true}
var reply sub_proto.PollResponse
if err := subclient.CallPoll(client, request, &reply); err != nil {
client.Close()
if err != io.EOF {
return "", fmt.Errorf("error polling sub: %s", err)
}
}
return reply.LastSuccessfulImageName, nil
}
func (h *hypervisorType) updateTagForHypervisor(
clientResource *srpc.ClientResource, key, value string) error {
newTags := h.initialTags.Copy()
newTags[key] = value
if key == "RequiredImage" {
delete(newTags, "PlannedImage")
}
if h.initialTags.Equal(newTags) {
return nil
}
client, err := clientResource.GetHTTP(nil, 0)
if err != nil {
return err
}
defer client.Put()
request := fm_proto.ChangeMachineTagsRequest{
Hostname: h.hostname,
Tags: newTags,
}
var reply fm_proto.ChangeMachineTagsResponse
err = client.RequestReply("FleetManager.ChangeMachineTags",
request, &reply)
if err != nil {
return err
}
return errors.New(reply.Error)
}
func (h *hypervisorType) upgrade(clientResource *srpc.ClientResource,
imageName string, cpuSharer *cpusharer.FifoCpuSharer) error {
cpuSharer.GrabCpu()
defer cpuSharer.ReleaseCpu()
list, _, err := h.getFailingHealthChecks(cpuSharer, time.Second)
if err != nil {
h.logger.Println(err)
return nil
} else if len(list) > 0 {
for _, failed := range list {
h.initialUnhealthyList[failed] = struct{}{}
}
}
h.logger.Debugln(0, "upgrading")
err = h.updateTagForHypervisor(clientResource, "RequiredImage", imageName)
if err != nil {
return err
}
stopTime := time.Now().Add(time.Minute * 15)
updateCompleted := false
var lastError string
for ; time.Until(stopTime) > 0; cpuSharer.Sleep(time.Second) {
if syncedImage, err := h.getLastImageName(cpuSharer); err != nil {
if lastError != err.Error() {
h.logger.Debugln(0, err)
}
lastError = err.Error()
continue
} else if syncedImage == imageName {
updateCompleted = true
break
}
}
if !updateCompleted {
return errors.New("timed out waiting for image update to complete")
}
h.logger.Debugln(0, "upgraded")
cpuSharer.Sleep(time.Second * 15)
list, _, err = h.getFailingHealthChecks(cpuSharer, time.Minute)
if err != nil {
return err
} else {
for _, entry := range list {
if _, ok := h.initialUnhealthyList[entry]; !ok {
return fmt.Errorf("health check failed: %s:", entry)
}
}
}
h.logger.Debugln(0, "still healthy")
return nil
}
func (h *hypervisorType) waitLastImageName(cpuSharer *cpusharer.FifoCpuSharer) (
string, error) {
stopTime := time.Now().Add(time.Minute)
for ; time.Until(stopTime) > 0; cpuSharer.Sleep(time.Second * 5) {
imageName, err := h.getLastImageName(cpuSharer)
if err != nil {
h.logger.Debugln(0, err)
continue
}
return imageName, nil
}
return "", errors.New("timed out getting last image name")
}