func Restore(snapshotName string) {
snapshot := common.LoadSnapshot(common.Cfg.BackupSet.SnapshotsDir + snapshotName)
log.Info("Restoring bucket %s to snapshot %s.", common.Cfg.BackupSet.MasterBucket, snapshotName)
common.ConfigureAws(common.Cfg.BackupSet.MasterRegion)
for i := 0; i < common.RestoreWorkerCount; i++ {
readyRestoreWorkers <- i
go downloadWorker()
go uploadWorker()
}
for _, version := range snapshot.Contents {
wid := <-readyRestoreWorkers
downloadWorkQueue <- DownloadWork{Wid: wid, Version: version, Retry: 0}
}
for i := common.RestoreWorkerCount; i > 0; i-- {
log.Info("Wait for %d restore workers to finish.", i)
wid := <-readyRestoreWorkers
log.Info("Restore worker [%d] finished.", wid)
}
close(downloadWorkQueue)
close(uploadWorkQueue)
log.Info("Restored bucket %s to snapshot %s.", common.Cfg.BackupSet.MasterBucket, snapshotName)
}
func dispatchWorkers() {
forloop:
for {
select {
case path := <-workRequests:
select {
case wid := <-readySnapshotWorkers:
go snapshotWorker(wid, path)
default:
snapshotWorkQueue = append(snapshotWorkQueue, path)
}
case wid := <-doneSnapshotWorkers:
if len(snapshotWorkQueue) == 0 {
break forloop
}
path := snapshotWorkQueue[0]
snapshotWorkQueue = snapshotWorkQueue[1:]
go snapshotWorker(wid, path)
}
}
for i := common.SnapshotWorkerCount; i > 1; i-- {
log.Info("Wait for %d snapshot workers to finish.", i)
select {
case wid := <-readySnapshotWorkers:
log.Info("Snapshot worker [%d] finished, was never executed.", wid)
case wid := <-doneSnapshotWorkers:
log.Info("Snapshot worker [%d] finished.", wid)
}
}
log.Info("All snapshot workers finished.")
close(versionsFunnel)
}
func Snapshot() {
timestamp := time.Now()
timestampStr := timestamp.Format("20060102150405-0700MST")
log.Info("Taking snapshot %s of bucket %s.", timestampStr, common.Cfg.BackupSet.SlaveBucket)
common.ConfigureAws(common.Cfg.BackupSet.SlaveRegion)
for wid := 0; wid < common.SnapshotWorkerCount; wid++ {
readySnapshotWorkers <- wid
}
go func() { workRequests <- "" }()
go dispatchWorkers()
for newVersions := range versionsFunnel {
versions = append(versions, newVersions...)
}
log.Info("Dumping snapshot to %s%s.", common.Cfg.BackupSet.SnapshotsDir, timestampStr)
snapshot := &common.Snapshot{
File: common.Cfg.BackupSet.SnapshotsDir + "/" + timestampStr,
Timestamp: timestamp,
Contents: versions,
}
if common.Cfg.BackupSet.CompressSnapshots {
snapshot.File += ".Z"
}
bytes, err := json.MarshalIndent(snapshot, "", " ")
if err != nil {
log.Fatal("Could not marshal snapshot %s: %s", timestampStr, err)
}
if common.Cfg.BackupSet.CompressSnapshots {
f, openErr := os.OpenFile(snapshot.File, os.O_WRONLY|os.O_CREATE, 0644)
if openErr != nil {
log.Fatal("Could not open file %s: %s", snapshot.File, openErr)
}
defer f.Close()
w := gzip.NewWriter(f)
if _, writeErr := w.Write(bytes); writeErr != nil {
log.Fatal("Could not write compressed snapshot file %s: %s", snapshot.File, writeErr)
}
w.Close()
} else {
if writeErr := ioutil.WriteFile(snapshot.File, bytes, 0644); err != nil {
log.Fatal("Could not write snapshot file %s: %s", snapshot.File, writeErr)
}
}
log.Info("Snapshot %s of bucket %s is DONE.", timestampStr, common.Cfg.BackupSet.SlaveBucket)
}
func discriminateSnapshots(snapshots []common.Snapshot) (old []common.Snapshot, recent []common.Snapshot) {
retentionPeriod := time.Now().AddDate(0, 0, -common.Cfg.BackupSet.RetentionPolicy)
log.Info("Retention period is from %s up until now.", retentionPeriod)
for _, snapshot := range snapshots {
if retentionPeriod.After(snapshot.Timestamp) {
log.Info("Snapshot '%s' on %s is old.", snapshot.File, snapshot.Timestamp)
old = append(old, snapshot)
} else {
log.Info("Snapshot '%s' on %s is recent.", snapshot.File, snapshot.Timestamp)
recent = append(recent, snapshot)
}
}
return
}
func LoadSnapshots() (snapshots []Snapshot) {
log.Info("Loading snapshots")
files, _ := filepath.Glob(Cfg.BackupSet.SnapshotsDir + "/*")
for _, file := range files {
snapshots = append(snapshots, LoadSnapshot(file))
}
return
}
func GarbageCollect() {
log.Info("Garbage collecting obsolete backups.")
snapshots := common.LoadSnapshots()
if len(snapshots) <= common.Cfg.BackupSet.MinimumRedundancy {
log.Fatal("Minimum redundancy is not met. Current snapshot count is %d.", len(snapshots))
}
oldSnapshots, recentSnapshots := discriminateSnapshots(snapshots)
discriminateVersions(oldSnapshots, recentSnapshots)
versionsToRemove := discriminateVersions(oldSnapshots, recentSnapshots)
if ok := removeVersions(versionsToRemove); !ok {
log.Fatal("There was an unhandled error removing obsolete versions, exiting.")
}
removeSnapshots(oldSnapshots)
}
func LoadSnapshot(file string) (snapshot Snapshot) {
log.Info("Loading snapshot file '%s'.", file)
var bytes []byte
var readErr error
if filepath.Ext(file) == ".Z" {
f, openErr := os.OpenFile(file, os.O_RDONLY, 0000)
if openErr != nil {
log.Fatal("Could not open file %s: %s", file, openErr)
}
defer f.Close()
r, nrErr := gzip.NewReader(f)
if nrErr != nil {
log.Fatal("Could not initialize gzip decompressor: %s", nrErr)
}
defer r.Close()
bytes, readErr = ioutil.ReadAll(r)
if readErr != nil {
log.Fatal("Could not read compressed snapshot file %s: %s", file, readErr)
}
} else {
bytes, readErr = ioutil.ReadFile(file)
if readErr != nil {
log.Fatal("Could not read snapshot file '%s': %s", file, readErr)
}
}
err := json.Unmarshal(bytes, &snapshot)
if err != nil {
log.Fatal("Could not parse snapshot file '%s': %s", file, err)
}
snapshot.File = file
if Cfg.LogLevel > 0 {
pretty, _ := json.MarshalIndent(snapshot, "", " ")
log.Debug("Snapshot '%s':\n%s", file, pretty)
}
return
}
func snapshotWorker(wid int, path string) {
log.Info("[%d] Explore path '%s'.", wid, path)
s3Client := s3.New(nil)
params := &s3.ListObjectVersionsInput{
Bucket: aws.String(common.Cfg.BackupSet.SlaveBucket),
Delimiter: aws.String("/"),
// EncodingType: aws.String("EncodingType"),
// KeyMarker: aws.String("KeyMarker"),
MaxKeys: aws.Int64(common.SnapshotBatchSize),
Prefix: aws.String(path),
// VersionIdMarker: aws.String("VersionIdMarker"),
}
var discoveredVersions []common.Version
buffer := make([]common.Version, common.SnapshotBatchSize)
for batch := 1; ; batch++ {
log.Debug("[%d] Request batch %d for path '%s'", wid, batch, path)
resp, err := s3Client.ListObjectVersions(params)
if err != nil {
if awsErr, ok := err.(awserr.Error); ok {
if reqErr, ok := err.(awserr.RequestFailure); ok {
// A service error occurred
log.Error(awsErr.Code(), awsErr.Message(), awsErr.OrigErr())
log.Fatal(reqErr.Code(), reqErr.Message(), reqErr.StatusCode(), reqErr.RequestID())
} else {
log.Fatal(awsErr.Code(), awsErr.Message(), awsErr.OrigErr())
}
} else {
// This case should never be hit, The SDK should alway return an
// error which satisfies the awserr.Error interface.
log.Fatal(err.Error())
}
}
for _, cp := range resp.CommonPrefixes {
discoveredPath := *cp.Prefix
log.Info("[%d] Discover path '%s'.", wid, discoveredPath)
workRequests <- discoveredPath
}
index := 0
for _, v := range resp.Versions {
if v.IsLatest == nil {
log.Fatal("[%d] IsLatest is nil", wid)
}
if v.IsLatest != nil && *v.IsLatest == true {
if v.Key == nil {
log.Fatal("[%d] Key is nil", wid)
}
if v.LastModified == nil {
log.Fatal("[%d] LastModified is nil", wid)
}
if v.Size == nil {
log.Fatal("[%d] Size is nil", wid)
}
if v.VersionId == nil {
log.Fatal("[%d] VersionId is nil", wid)
}
version := common.Version{
Key: *v.Key,
LastModified: *v.LastModified,
Size: *v.Size,
VersionId: *v.VersionId,
}
log.Debug("[%d] Discover latest version: %s", wid, version)
buffer[index] = version
index++
} else {
log.Debug("[%d] Discover noncurrent latest version for key '%s'.", wid, *v.Key)
}
}
discoveredVersions = append(discoveredVersions, buffer[0:index]...)
if !*resp.IsTruncated {
break
}
log.Info("[%d] Continue exploring path '%s'.", wid, path)
if resp.NextVersionIdMarker != nil {
log.Debug("[%d] NextVersionIdMarker = %+v", wid, resp.NextVersionIdMarker)
} else {
log.Debug("[%d] NextVersionIdMarker = nil", wid)
}
if resp.NextKeyMarker != nil {
log.Debug("[%d] NextKeyMarker = %+v", wid, resp.NextKeyMarker)
} else {
log.Debug("[%d] NextKeyMarker = nil", wid)
}
params.VersionIdMarker = resp.NextVersionIdMarker
params.KeyMarker = resp.NextKeyMarker
}
log.Info("[%d] Registering versions for path '%s'.", wid, path)
versionsFunnel <- discoveredVersions
log.Info("[%d] Done exploring path '%s'.", wid, path)
doneSnapshotWorkers <- wid
}
func uploadWorker() {
s3Client := s3.New(nil)
for work := range uploadWorkQueue {
log.Debug("[%d] Upload version, retry %d: %s", work.Wid, work.Retry, work.Version)
putParams := &s3.PutObjectInput{
Bucket: aws.String(common.Cfg.BackupSet.MasterBucket), // Required
Key: aws.String(work.Version.Key), // Required
// ACL: aws.String("ObjectCannedACL"),
Body: bytes.NewReader(work.Bytes),
// CacheControl: aws.String("CacheControl"),
// ContentDisposition: aws.String("ContentDisposition"),
// ContentEncoding: aws.String("ContentEncoding"),
// ContentLanguage: aws.String("ContentLanguage"),
// ContentLength: aws.Long(1),
// ContentType: aws.String("ContentType"),
// Expires: aws.Time(time.Now()),
// GrantFullControl: aws.String("GrantFullControl"),
// GrantRead: aws.String("GrantRead"),
// GrantReadACP: aws.String("GrantReadACP"),
// GrantWriteACP: aws.String("GrantWriteACP"),
// Metadata: map[string]*string{
// "Key": aws.String("MetadataValue"), // Required
// // More values...
// },
// RequestPayer: aws.String("RequestPayer"),
// SSECustomerAlgorithm: aws.String("SSECustomerAlgorithm"),
// SSECustomerKey: aws.String("SSECustomerKey"),
// SSECustomerKeyMD5: aws.String("SSECustomerKeyMD5"),
// SSEKMSKeyID: aws.String("SSEKMSKeyId"),
// ServerSideEncryption: aws.String("ServerSideEncryption"),
// StorageClass: aws.String("StorageClass"),
// WebsiteRedirectLocation: aws.String("WebsiteRedirectLocation"),
}
_, putErr := s3Client.PutObject(putParams)
if putErr != nil {
if awsErr, ok := putErr.(awserr.Error); ok {
log.Error("[%d] Error code '%s', message '%s', origin '%s'", work.Wid, awsErr.Code(), awsErr.Message(), awsErr.OrigErr())
if reqErr, ok := putErr.(awserr.RequestFailure); ok {
log.Error("[%d] Service error code '%s', message '%s', status code '%d', request id '%s'", work.Wid, reqErr.Code(), reqErr.Message(), reqErr.StatusCode(), reqErr.RequestID())
}
} else {
// This case should never be hit, The SDK should alwsy return an
// error which satisfies the awserr.Error interface.
log.Error("[%d] Non AWS error: %s", work.Wid, putErr.Error())
}
work.Retry++
if work.Retry == common.MaxRetries {
log.Fatal("[%d] Error uploading version, retry %d: %s", work.Wid, work.Retry, work.Version)
}
log.Error("[%d] Error uploading version, retry %d: %s", work.Wid, work.Retry, work.Version)
uploadWorkQueue <- work
continue
}
log.Info("[%d] Restored version: %s", work.Wid, work.Version)
readyRestoreWorkers <- work.Wid
}
}