forked from Cloud-Foundations/Dominator
/
pushImage.go
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/
pushImage.go
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package main
import (
"errors"
"fmt"
"io"
"time"
"github.com/Cloud-Foundations/Dominator/dom/lib"
imgclient "github.com/Cloud-Foundations/Dominator/imageserver/client"
"github.com/Cloud-Foundations/Dominator/lib/filesystem"
"github.com/Cloud-Foundations/Dominator/lib/filesystem/scanner"
"github.com/Cloud-Foundations/Dominator/lib/filter"
"github.com/Cloud-Foundations/Dominator/lib/format"
"github.com/Cloud-Foundations/Dominator/lib/hash"
"github.com/Cloud-Foundations/Dominator/lib/image"
"github.com/Cloud-Foundations/Dominator/lib/log"
"github.com/Cloud-Foundations/Dominator/lib/objectcache"
"github.com/Cloud-Foundations/Dominator/lib/srpc"
"github.com/Cloud-Foundations/Dominator/lib/triggers"
"github.com/Cloud-Foundations/Dominator/proto/sub"
"github.com/Cloud-Foundations/Dominator/sub/client"
)
type nullObjectGetterType struct{}
type timedImageFetch struct {
image *image.Image
duration time.Duration
}
func (getter nullObjectGetterType) GetObject(hashVal hash.Hash) (
uint64, io.ReadCloser, error) {
return 0, nil, errors.New("no computed files")
}
func pushImageSubcommand(args []string, logger log.DebugLogger) error {
startTime := showStart("getSubClient()")
srpcClient := getSubClientRetry(logger)
defer srpcClient.Close()
showTimeTaken(startTime)
if err := pushImage(srpcClient, args[0]); err != nil {
return fmt.Errorf("error pushing image: %s: %s", args[0], err)
}
return nil
}
func pushImage(srpcClient *srpc.Client, imageName string) error {
computedInodes := make(map[string]*filesystem.RegularInode)
// Start querying the imageserver for the image.
imageServerAddress := fmt.Sprintf("%s:%d",
*imageServerHostname, *imageServerPortNum)
imgChannel := getImageChannel(imageServerAddress, imageName, timeoutTime)
subObj := lib.Sub{
Hostname: *subHostname,
Client: srpcClient,
ComputedInodes: computedInodes}
deleteMissingComputedFiles := true
ignoreMissingComputedFiles := false
if *computedFilesRoot == "" {
subObj.ObjectGetter = nullObjectGetterType{}
deleteMissingComputedFiles = false
ignoreMissingComputedFiles = true
} else {
fs, err := scanner.ScanFileSystem(*computedFilesRoot, nil, nil, nil,
nil, nil)
if err != nil {
return err
}
subObj.ObjectGetter = fs
for filename, inum := range fs.FilenameToInodeTable() {
if inode, ok := fs.InodeTable[inum].(*filesystem.RegularInode); ok {
computedInodes[filename] = inode
}
}
}
startTime := showStart("<-imgChannel")
imageResult := <-imgChannel
showTimeTaken(startTime)
logger.Printf("Background image fetch took %s\n",
format.Duration(imageResult.duration))
img := imageResult.image
var err error
if *filterFile != "" {
img.Filter, err = filter.Load(*filterFile)
if err != nil {
return err
}
}
if *triggersFile != "" {
img.Triggers, err = triggers.Load(*triggersFile)
if err != nil {
return err
}
} else if *triggersString != "" {
img.Triggers, err = triggers.Decode([]byte(*triggersString))
if err != nil {
return err
}
}
err = pollFetchAndPush(&subObj, img, imageServerAddress, timeoutTime, false,
logger)
if err != nil {
return err
}
if err := srpcClient.SetKeepAlivePeriod(time.Second); err != nil {
return fmt.Errorf("error setting keep-alive period: %s", err)
}
var updateRequest sub.UpdateRequest
var updateReply sub.UpdateResponse
startTime = showStart("lib.BuildUpdateRequest()")
if lib.BuildUpdateRequest(subObj, img, &updateRequest,
deleteMissingComputedFiles, ignoreMissingComputedFiles, logger) {
showBlankLine()
return errors.New("missing computed file(s)")
}
showTimeTaken(startTime)
updateRequest.ImageName = imageName
updateRequest.Wait = true
startTime = showStart("Subd.Update()")
err = client.CallUpdate(srpcClient, updateRequest, &updateReply)
if err != nil {
showBlankLine()
return err
}
showTimeTaken(startTime)
return nil
}
func getImageChannel(clientName, imageName string,
timeoutTime time.Time) <-chan timedImageFetch {
resultChannel := make(chan timedImageFetch, 1)
go func() {
startTime := time.Now()
img, err := getImageRetry(clientName, imageName, timeoutTime)
if err != nil {
logger.Fatalf("Error getting image: %s\n", err)
}
resultChannel <- timedImageFetch{img, time.Since(startTime)}
}()
return resultChannel
}
func getImageRetry(clientName, imageName string,
timeoutTime time.Time) (*image.Image, error) {
imageSrpcClient, err := srpc.DialHTTP("tcp", clientName, 0)
if err != nil {
return nil, err
}
defer imageSrpcClient.Close()
firstTime := true
for ; time.Now().Before(timeoutTime); time.Sleep(time.Second) {
img, err := imgclient.GetImage(imageSrpcClient, imageName)
if err != nil {
return nil, err
} else if img != nil {
if err := img.FileSystem.RebuildInodePointers(); err != nil {
return nil, err
}
img.FileSystem.InodeToFilenamesTable()
img.FileSystem.FilenameToInodeTable()
img.FileSystem.HashToInodesTable()
img.FileSystem.ComputeTotalDataBytes()
img.FileSystem.BuildEntryMap()
return img, nil
} else if firstTime {
logger.Printf("Image: %s not found, will retry\n", imageName)
firstTime = false
}
}
return nil, errors.New("timed out getting image")
}
func pollFetchAndPush(subObj *lib.Sub, img *image.Image,
imageServerAddress string, timeoutTime time.Time, singleFetch bool,
logger log.DebugLogger) error {
var generationCount, lastGenerationCount, lastScanCount uint64
deleteEarly := *deleteBeforeFetch
ignoreMissingComputedFiles := true
pushComputedFiles := true
if *computedFilesRoot == "" {
ignoreMissingComputedFiles = false
pushComputedFiles = false
}
for ; time.Now().Before(timeoutTime); time.Sleep(time.Second) {
var pollReply sub.PollResponse
if err := client.BoostCpuLimit(subObj.Client); err != nil {
return err
}
if err := pollAndBuildPointers(subObj.Client, &generationCount,
&pollReply); err != nil {
return err
}
if pollReply.GenerationCount != lastGenerationCount ||
pollReply.ScanCount != lastScanCount {
if pollReply.FileSystem == nil {
logger.Debugf(0,
"Poll Scan: %d, Generation: %d, cached objects: %d\n",
pollReply.ScanCount, pollReply.GenerationCount,
len(pollReply.ObjectCache))
} else {
logger.Debugf(0,
"Poll Scan: %d, Generation: %d, FS objects: %d, cached objects: %d\n",
pollReply.ScanCount, pollReply.GenerationCount,
len(pollReply.FileSystem.InodeTable),
len(pollReply.ObjectCache))
}
}
lastGenerationCount = pollReply.GenerationCount
lastScanCount = pollReply.ScanCount
if pollReply.FileSystem == nil {
continue
}
if deleteEarly {
deleteEarly = false
if deleteUnneededFiles(subObj.Client, pollReply.FileSystem,
img.FileSystem, logger) {
continue
}
}
subObj.FileSystem = pollReply.FileSystem
subObj.ObjectCache = pollReply.ObjectCache
startTime := showStart("lib.BuildMissingLists()")
objectsToFetch, objectsToPush := lib.BuildMissingLists(*subObj, img,
pushComputedFiles, ignoreMissingComputedFiles, logger)
showTimeTaken(startTime)
if len(objectsToFetch) < 1 && len(objectsToPush) < 1 {
return nil
}
if len(objectsToFetch) > 0 {
logger.Debugf(0, "Fetch(%d)\n", len(objectsToFetch))
startTime := showStart("Fetch()")
err := fetchUntil(subObj, sub.FetchRequest{
ServerAddress: imageServerAddress,
Wait: true,
Hashes: objectcache.ObjectMapToCache(objectsToFetch)},
timeoutTime, logger)
if err != nil {
logger.Printf("Error calling %s:Subd.Fetch(%s): %s\n",
subObj.Hostname, imageServerAddress, err)
return err
}
showTimeTaken(startTime)
if singleFetch {
return nil
}
}
if len(objectsToPush) > 0 {
logger.Debugf(0, "PushObjects(%d)\n", len(objectsToPush))
startTime := showStart("lib.PushObjects()")
err := lib.PushObjects(*subObj, objectsToPush, logger)
if err != nil {
showBlankLine()
return err
}
showTimeTaken(startTime)
}
}
return errors.New("timed out fetching and pushing objects")
}
func fetchUntil(subObj *lib.Sub, request sub.FetchRequest,
timeoutTime time.Time, logger log.DebugLogger) error {
showBlank := true
for ; time.Now().Before(timeoutTime); time.Sleep(time.Second) {
err := subObj.Client.RequestReply("Subd.Fetch", request,
&sub.FetchResponse{})
if err == nil {
return nil
}
if showBlank {
showBlankLine()
showBlank = false
}
logger.Printf("Error calling %s:Subd.Fetch(): %s\n",
subObj.Hostname, err)
}
if showBlank {
showBlankLine()
}
return errors.New("timed out fetching objects")
}
func pollAndBuildPointers(srpcClient *srpc.Client, generationCount *uint64,
pollReply *sub.PollResponse) error {
pollRequest := sub.PollRequest{HaveGeneration: *generationCount}
startTime := showStart("Poll()")
err := client.CallPoll(srpcClient, pollRequest, pollReply)
if err != nil {
showBlankLine()
return err
}
showTimeTaken(startTime)
*generationCount = pollReply.GenerationCount
fs := pollReply.FileSystem
if fs == nil {
return nil
}
startTime = showStart("FileSystem.RebuildInodePointers()")
if err := fs.RebuildInodePointers(); err != nil {
showBlankLine()
return err
}
showTimeTaken(startTime)
fs.BuildEntryMap()
return nil
}
func showStart(operation string) time.Time {
if *showTimes {
logger.Print(operation, " ")
}
return time.Now()
}
func showTimeTaken(startTime time.Time) {
if *showTimes {
stopTime := time.Now()
logger.Printf("took %s\n", format.Duration(stopTime.Sub(startTime)))
}
}
func showBlankLine() {
if *showTimes {
logger.Println()
}
}
func deleteUnneededFiles(srpcClient *srpc.Client, subFS *filesystem.FileSystem,
imgFS *filesystem.FileSystem, logger log.DebugLogger) bool {
startTime := showStart("compute early files to delete")
pathsToDelete := make([]string, 0)
imgHashToInodesTable := imgFS.HashToInodesTable()
imgFilenameToInodeTable := imgFS.FilenameToInodeTable()
for pathname, inum := range subFS.FilenameToInodeTable() {
if inode, ok := subFS.InodeTable[inum].(*filesystem.RegularInode); ok {
if inode.Size > 0 {
if _, ok := imgHashToInodesTable[inode.Hash]; !ok {
pathsToDelete = append(pathsToDelete, pathname)
}
} else {
if _, ok := imgFilenameToInodeTable[pathname]; !ok {
pathsToDelete = append(pathsToDelete, pathname)
}
}
}
}
showTimeTaken(startTime)
if len(pathsToDelete) < 1 {
return false
}
updateRequest := sub.UpdateRequest{
Wait: true,
PathsToDelete: pathsToDelete}
var updateReply sub.UpdateResponse
startTime = showStart("Subd.Update() for early files to delete")
err := client.CallUpdate(srpcClient, updateRequest, &updateReply)
showTimeTaken(startTime)
if err != nil {
logger.Println(err)
}
return true
}