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fs_blobs_dir.go
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/
fs_blobs_dir.go
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package releasedir
import (
boshblob "github.com/cloudfoundry/bosh-utils/blobstore"
boshcrypto "github.com/cloudfoundry/bosh-utils/crypto"
bosherr "github.com/cloudfoundry/bosh-utils/errors"
boshfu "github.com/cloudfoundry/bosh-utils/fileutil"
boshlog "github.com/cloudfoundry/bosh-utils/logger"
boshsys "github.com/cloudfoundry/bosh-utils/system"
"gopkg.in/yaml.v2"
"io"
"os"
"path/filepath"
"sort"
"fmt"
bicrypto "github.com/cloudfoundry/bosh-cli/crypto"
)
type FSBlobsDir struct {
indexPath string
dirPath string
reporter BlobsDirReporter
blobstore boshblob.DigestBlobstore
digestCalculator bicrypto.DigestCalculator
fs boshsys.FileSystem
logTag string
logger boshlog.Logger
}
/*
---
golang/go1.5.1.linux-amd64.tar.gz:
object_id: 36764f38-6274-4a5d-8faa-26c31a745cb2
sha: 46eecd290d8803887dec718c691cc243f2175fe0
size: 77875767
*/
type fsBlobsDirSchema map[string]fsBlobsDirSchema_Blob
type fsBlobsDirSchema_Blob struct {
Size int64 `yaml:"size"`
BlobstoreID string `yaml:"object_id,omitempty"`
SHA1 string `yaml:"sha"`
}
func NewFSBlobsDir(
dirPath string,
reporter BlobsDirReporter,
blobstore boshblob.DigestBlobstore,
digestCalculator bicrypto.DigestCalculator,
fs boshsys.FileSystem,
logger boshlog.Logger,
) FSBlobsDir {
return FSBlobsDir{
indexPath: filepath.Join(dirPath, "config", "blobs.yml"),
dirPath: filepath.Join(dirPath, "blobs"),
reporter: reporter,
blobstore: blobstore,
digestCalculator: digestCalculator,
fs: fs,
logTag: "releasedir.FSBlobsDir",
logger: logger,
}
}
func (d FSBlobsDir) Init() error {
err := d.fs.MkdirAll(filepath.Dir(d.indexPath), os.ModePerm)
if err != nil {
return bosherr.WrapErrorf(err, "Creating blobs/")
}
err = d.fs.WriteFileString(d.indexPath, "--- {}\n")
if err != nil {
return bosherr.WrapErrorf(err, "Initing blobs.yml")
}
return nil
}
func (d FSBlobsDir) Blobs() ([]Blob, error) {
bytes, err := d.fs.ReadFile(d.indexPath)
if err != nil {
return nil, bosherr.WrapErrorf(err, "Reading blobs index")
}
var schema fsBlobsDirSchema
err = yaml.Unmarshal(bytes, &schema)
if err != nil {
return nil, bosherr.WrapError(err, "Unmarshalling blobs index")
}
var blobs []Blob
for recPath, rec := range schema {
blobs = append(blobs, Blob{
Path: recPath,
Size: rec.Size,
BlobstoreID: rec.BlobstoreID,
SHA1: rec.SHA1,
})
}
sort.Sort(BlobSorting(blobs))
return blobs, nil
}
func (d FSBlobsDir) SyncBlobs(numOfParallelWorkers int) error {
blobs, err := d.Blobs()
if err != nil {
return err
}
symlinksFound, err := d.containsSymlinks()
if err != nil {
return bosherr.WrapErrorf(err, "Syncing blobs")
}
if symlinksFound {
return bosherr.Error("Bailing because symlinks found in blobs directory. If switching from CLI v1, please use the `reset-release` command.")
}
if err := d.removeUnknownBlobs(blobs); err != nil {
return bosherr.WrapErrorf(err, "Syncing blobs")
}
resultsCh := make(chan error, len(blobs))
defer close(resultsCh)
blobsCh := make(chan Blob, numOfParallelWorkers)
defer close(blobsCh)
for w := 0; w < numOfParallelWorkers; w++ {
go d.downloadBlobsWorker(blobsCh, resultsCh)
}
for _, blob := range blobs {
blobsCh <- blob
}
var errs []error
for i := 0; i < len(blobs); i++ {
err := <-resultsCh
if err != nil {
errs = append(errs, err)
}
}
if errs != nil {
return bosherr.NewMultiError(errs...)
}
return nil
}
func (d FSBlobsDir) removeUnknownBlobs(blobs []Blob) error {
files, err := d.fs.RecursiveGlob(filepath.Join(d.dirPath, "**/*"))
if err != nil {
return bosherr.WrapErrorf(err, "Checking for unknown blobs")
}
for _, file := range files {
fileInfo, err := d.fs.Stat(file)
if err != nil {
return bosherr.WrapErrorf(err, "Determining existing blobs")
}
if fileInfo.IsDir() {
continue
}
found := false
for _, blob := range blobs {
if file == filepath.Join(d.dirPath, blob.Path) {
found = true
break
}
}
if !found {
d.logger.Info(d.logTag, fmt.Sprintf("Deleting blob at '%s' that is not in the blob index.", file))
if err := d.fs.RemoveAll(file); err != nil {
return bosherr.WrapErrorf(err, "Removing unknown blob")
}
}
}
return nil
}
func (d FSBlobsDir) downloadBlobsWorker(blobsCh chan Blob, resultsCh chan<- error) {
for blob := range blobsCh {
var err error
if len(blob.BlobstoreID) > 0 {
err = d.downloadBlob(blob)
}
resultsCh <- err
}
}
func (d FSBlobsDir) TrackBlob(path string, src io.ReadCloser) (Blob, error) {
tempFile, err := d.fs.TempFile("track-blob")
if err != nil {
return Blob{}, bosherr.WrapErrorf(err, "Creating temp blob")
}
defer tempFile.Close()
_, err = io.Copy(tempFile, src)
if err != nil {
return Blob{}, bosherr.WrapErrorf(err, "Populating temp blob")
}
//generation of digest string
sha1, err := d.digestCalculator.Calculate(tempFile.Name())
if err != nil {
return Blob{}, bosherr.WrapErrorf(err, "Calculating temp blob sha1")
}
fileInfo, err := tempFile.Stat()
if err != nil {
return Blob{}, bosherr.WrapErrorf(err, "Stating temp blob")
}
blobs, err := d.Blobs()
if err != nil {
return Blob{}, err
}
idx := -1
for i, blob := range blobs {
if blob.Path == path {
idx = i
break
}
}
if idx == -1 {
blobs = append(blobs, Blob{})
idx = len(blobs) - 1
}
blobs[idx] = Blob{Path: path, Size: fileInfo.Size(), SHA1: sha1}
tempFile.Close()
err = d.moveBlobLocally(tempFile.Name(), filepath.Join(d.dirPath, path))
if err != nil {
return Blob{}, err
}
return blobs[idx], d.save(blobs)
}
func (d FSBlobsDir) UntrackBlob(path string) error {
blobs, err := d.Blobs()
if err != nil {
return err
}
err = d.fs.RemoveAll(filepath.Join(d.dirPath, path))
if err != nil {
return bosherr.WrapErrorf(err, "Removing blob from blobs/")
}
for i, blob := range blobs {
if blob.Path == path {
return d.save(append(blobs[:i], blobs[i+1:]...))
}
}
return nil
}
func (d FSBlobsDir) UploadBlobs() error {
blobs, err := d.Blobs()
if err != nil {
return err
}
for i, blob := range blobs {
if len(blob.BlobstoreID) == 0 {
blobID, err := d.uploadBlob(blob)
if err != nil {
return err
}
blob.BlobstoreID = blobID
blobs[i] = blob
err = d.save(blobs)
if err != nil {
return bosherr.WrapErrorf(
err, "Saving newly created blob '%s' for path '%s'", blobID, blob.Path)
}
}
}
return nil
}
func (d FSBlobsDir) containsSymlinks() (bool, error) {
files, err := d.fs.RecursiveGlob(filepath.Join(d.dirPath, "**/*"))
if err != nil {
return false, nil
}
for _, file := range files {
fileInfo, err := d.fs.Lstat(file)
if err != nil {
return false, err
}
if fileInfo.Mode()&os.ModeSymlink != 0 {
return true, nil
}
}
return false, nil
}
func (d FSBlobsDir) checkBlobExistence(dstPath string, digest boshcrypto.MultipleDigest) bool {
if d.fs.FileExists(dstPath) {
if err := digest.VerifyFilePath(dstPath, d.fs); err != nil {
d.logger.Error(d.logTag, fmt.Sprintf("Incorrect SHA sum for blob at '%s'. Re-downloading from blobstore.", dstPath))
return false
}
return true
}
return false
}
func (d FSBlobsDir) downloadBlob(blob Blob) error {
dstPath := filepath.Join(d.dirPath, blob.Path)
digest, err := boshcrypto.ParseMultipleDigest(blob.SHA1)
if err != nil {
return bosherr.WrapErrorf(
err, "Generating multi digest for blob '%s' for path '%s' with digest string '%s'", blob.BlobstoreID, blob.Path, blob.SHA1)
}
if d.checkBlobExistence(dstPath, digest) {
return nil
}
d.reporter.BlobDownloadStarted(blob.Path, blob.Size, blob.BlobstoreID, blob.SHA1)
path, err := d.blobstore.Get(blob.BlobstoreID, digest)
if err != nil {
d.reporter.BlobDownloadFinished(blob.Path, blob.BlobstoreID, err)
return bosherr.WrapErrorf(
err, "Getting blob '%s' for path '%s'", blob.BlobstoreID, blob.Path)
}
d.reporter.BlobDownloadFinished(blob.Path, blob.BlobstoreID, nil)
return d.moveBlobLocally(path, dstPath)
}
func (d FSBlobsDir) uploadBlob(blob Blob) (string, error) {
var blobID string
d.reporter.BlobUploadStarted(blob.Path, blob.Size, blob.SHA1)
srcPath := filepath.Join(d.dirPath, blob.Path)
blobID, _, err := d.blobstore.Create(srcPath)
if err != nil {
d.reporter.BlobUploadFinished(blob.Path, "", err)
return "", bosherr.WrapErrorf(err, "Creating blob for path '%s'", blob.Path)
}
d.reporter.BlobUploadFinished(blob.Path, blobID, nil)
return blobID, nil
}
func (d FSBlobsDir) moveBlobLocally(srcPath, dstPath string) error {
err := d.fs.MkdirAll(filepath.Dir(dstPath), os.ModePerm)
if err != nil {
return bosherr.WrapErrorf(err, "Creating subdirs in blobs/")
}
err = boshfu.NewFileMover(d.fs).Move(srcPath, dstPath)
if err != nil {
return bosherr.WrapErrorf(err, "Moving temp blob to blobs/")
}
return nil
}
func (d FSBlobsDir) save(blobs []Blob) error {
schema := fsBlobsDirSchema{}
for _, blob := range blobs {
schema[blob.Path] = fsBlobsDirSchema_Blob{
Size: blob.Size,
BlobstoreID: blob.BlobstoreID,
SHA1: blob.SHA1,
}
}
bytes, err := yaml.Marshal(schema)
if err != nil {
return bosherr.WrapError(err, "Marshalling blobs index")
}
err = d.fs.WriteFile(d.indexPath, bytes)
if err != nil {
return bosherr.WrapErrorf(err, "Writing blobs index")
}
return nil
}
type BlobSorting []Blob
func (s BlobSorting) Len() int {
return len(s)
}
func (s BlobSorting) Less(i, j int) bool {
return s[i].Path < s[j].Path
}
func (s BlobSorting) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}