+++ /dev/null
-// Copyright (C) The Arvados Authors. All rights reserved.
-//
-// SPDX-License-Identifier: AGPL-3.0
-
-package keepstore
-
-import (
- "bufio"
- "bytes"
- "context"
- "crypto/sha256"
- "encoding/base64"
- "encoding/hex"
- "encoding/json"
- "errors"
- "fmt"
- "io"
- "io/ioutil"
- "net/http"
- "os"
- "regexp"
- "strings"
- "sync"
- "sync/atomic"
- "time"
-
- "git.arvados.org/arvados.git/sdk/go/arvados"
- "github.com/AdRoll/goamz/aws"
- "github.com/AdRoll/goamz/s3"
- "github.com/prometheus/client_golang/prometheus"
- "github.com/sirupsen/logrus"
-)
-
-func init() {
- driver["S3"] = chooseS3VolumeDriver
-}
-
-func newS3Volume(cluster *arvados.Cluster, volume arvados.Volume, logger logrus.FieldLogger, metrics *volumeMetricsVecs) (Volume, error) {
- v := &S3Volume{cluster: cluster, volume: volume, metrics: metrics}
- err := json.Unmarshal(volume.DriverParameters, v)
- if err != nil {
- return nil, err
- }
- v.logger = logger.WithField("Volume", v.String())
- return v, v.check()
-}
-
-func (v *S3Volume) check() error {
- if v.Bucket == "" {
- return errors.New("DriverParameters: Bucket must be provided")
- }
- if v.IndexPageSize == 0 {
- v.IndexPageSize = 1000
- }
- if v.RaceWindow < 0 {
- return errors.New("DriverParameters: RaceWindow must not be negative")
- }
-
- if v.Endpoint == "" {
- r, ok := aws.Regions[v.Region]
- if !ok {
- return fmt.Errorf("unrecognized region %+q; try specifying endpoint instead", v.Region)
- }
- v.region = r
- } else {
- v.region = aws.Region{
- Name: v.Region,
- S3Endpoint: v.Endpoint,
- S3LocationConstraint: v.LocationConstraint,
- }
- }
-
- // Zero timeouts mean "wait forever", which is a bad
- // default. Default to long timeouts instead.
- if v.ConnectTimeout == 0 {
- v.ConnectTimeout = s3DefaultConnectTimeout
- }
- if v.ReadTimeout == 0 {
- v.ReadTimeout = s3DefaultReadTimeout
- }
-
- v.bucket = &s3bucket{
- bucket: &s3.Bucket{
- S3: v.newS3Client(),
- Name: v.Bucket,
- },
- }
- // Set up prometheus metrics
- lbls := prometheus.Labels{"device_id": v.GetDeviceID()}
- v.bucket.stats.opsCounters, v.bucket.stats.errCounters, v.bucket.stats.ioBytes = v.metrics.getCounterVecsFor(lbls)
-
- err := v.bootstrapIAMCredentials()
- if err != nil {
- return fmt.Errorf("error getting IAM credentials: %s", err)
- }
-
- return nil
-}
-
-const (
- s3DefaultReadTimeout = arvados.Duration(10 * time.Minute)
- s3DefaultConnectTimeout = arvados.Duration(time.Minute)
-)
-
-var (
- // ErrS3TrashDisabled is returned by Trash if that operation
- // is impossible with the current config.
- ErrS3TrashDisabled = fmt.Errorf("trash function is disabled because Collections.BlobTrashLifetime=0 and DriverParameters.UnsafeDelete=false")
-
- s3ACL = s3.Private
-
- zeroTime time.Time
-)
-
-const (
- maxClockSkew = 600 * time.Second
- nearlyRFC1123 = "Mon, 2 Jan 2006 15:04:05 GMT"
-)
-
-func s3regions() (okList []string) {
- for r := range aws.Regions {
- okList = append(okList, r)
- }
- return
-}
-
-// S3Volume implements Volume using an S3 bucket.
-type S3Volume struct {
- arvados.S3VolumeDriverParameters
- AuthToken string // populated automatically when IAMRole is used
- AuthExpiration time.Time // populated automatically when IAMRole is used
-
- cluster *arvados.Cluster
- volume arvados.Volume
- logger logrus.FieldLogger
- metrics *volumeMetricsVecs
- bucket *s3bucket
- region aws.Region
- startOnce sync.Once
-}
-
-// GetDeviceID returns a globally unique ID for the storage bucket.
-func (v *S3Volume) GetDeviceID() string {
- return "s3://" + v.Endpoint + "/" + v.Bucket
-}
-
-func (v *S3Volume) bootstrapIAMCredentials() error {
- if v.AccessKeyID != "" || v.SecretAccessKey != "" {
- if v.IAMRole != "" {
- return errors.New("invalid DriverParameters: AccessKeyID and SecretAccessKey must be blank if IAMRole is specified")
- }
- return nil
- }
- ttl, err := v.updateIAMCredentials()
- if err != nil {
- return err
- }
- go func() {
- for {
- time.Sleep(ttl)
- ttl, err = v.updateIAMCredentials()
- if err != nil {
- v.logger.WithError(err).Warnf("failed to update credentials for IAM role %q", v.IAMRole)
- ttl = time.Second
- } else if ttl < time.Second {
- v.logger.WithField("TTL", ttl).Warnf("received stale credentials for IAM role %q", v.IAMRole)
- ttl = time.Second
- }
- }
- }()
- return nil
-}
-
-func (v *S3Volume) newS3Client() *s3.S3 {
- auth := aws.NewAuth(v.AccessKeyID, v.SecretAccessKey, v.AuthToken, v.AuthExpiration)
- client := s3.New(*auth, v.region)
- if !v.V2Signature {
- client.Signature = aws.V4Signature
- }
- client.ConnectTimeout = time.Duration(v.ConnectTimeout)
- client.ReadTimeout = time.Duration(v.ReadTimeout)
- return client
-}
-
-// returned by AWS metadata endpoint .../security-credentials/${rolename}
-type iamCredentials struct {
- Code string
- LastUpdated time.Time
- Type string
- AccessKeyID string
- SecretAccessKey string
- Token string
- Expiration time.Time
-}
-
-// Returns TTL of updated credentials, i.e., time to sleep until next
-// update.
-func (v *S3Volume) updateIAMCredentials() (time.Duration, error) {
- ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(time.Minute))
- defer cancel()
-
- metadataBaseURL := "http://169.254.169.254/latest/meta-data/iam/security-credentials/"
-
- var url string
- if strings.Contains(v.IAMRole, "://") {
- // Configuration provides complete URL (used by tests)
- url = v.IAMRole
- } else if v.IAMRole != "" {
- // Configuration provides IAM role name and we use the
- // AWS metadata endpoint
- url = metadataBaseURL + v.IAMRole
- } else {
- url = metadataBaseURL
- v.logger.WithField("URL", url).Debug("looking up IAM role name")
- req, err := http.NewRequest("GET", url, nil)
- if err != nil {
- return 0, fmt.Errorf("error setting up request %s: %s", url, err)
- }
- resp, err := http.DefaultClient.Do(req.WithContext(ctx))
- if err != nil {
- return 0, fmt.Errorf("error getting %s: %s", url, err)
- }
- defer resp.Body.Close()
- if resp.StatusCode == http.StatusNotFound {
- return 0, fmt.Errorf("this instance does not have an IAM role assigned -- either assign a role, or configure AccessKeyID and SecretAccessKey explicitly in DriverParameters (error getting %s: HTTP status %s)", url, resp.Status)
- } else if resp.StatusCode != http.StatusOK {
- return 0, fmt.Errorf("error getting %s: HTTP status %s", url, resp.Status)
- }
- body := bufio.NewReader(resp.Body)
- var role string
- _, err = fmt.Fscanf(body, "%s\n", &role)
- if err != nil {
- return 0, fmt.Errorf("error reading response from %s: %s", url, err)
- }
- if n, _ := body.Read(make([]byte, 64)); n > 0 {
- v.logger.Warnf("ignoring additional data returned by metadata endpoint %s after the single role name that we expected", url)
- }
- v.logger.WithField("Role", role).Debug("looked up IAM role name")
- url = url + role
- }
-
- v.logger.WithField("URL", url).Debug("getting credentials")
- req, err := http.NewRequest("GET", url, nil)
- if err != nil {
- return 0, fmt.Errorf("error setting up request %s: %s", url, err)
- }
- resp, err := http.DefaultClient.Do(req.WithContext(ctx))
- if err != nil {
- return 0, fmt.Errorf("error getting %s: %s", url, err)
- }
- defer resp.Body.Close()
- if resp.StatusCode != http.StatusOK {
- return 0, fmt.Errorf("error getting %s: HTTP status %s", url, resp.Status)
- }
- var cred iamCredentials
- err = json.NewDecoder(resp.Body).Decode(&cred)
- if err != nil {
- return 0, fmt.Errorf("error decoding credentials from %s: %s", url, err)
- }
- v.AccessKeyID, v.SecretAccessKey, v.AuthToken, v.AuthExpiration = cred.AccessKeyID, cred.SecretAccessKey, cred.Token, cred.Expiration
- v.bucket.SetBucket(&s3.Bucket{
- S3: v.newS3Client(),
- Name: v.Bucket,
- })
- // TTL is time from now to expiration, minus 5m. "We make new
- // credentials available at least five minutes before the
- // expiration of the old credentials." --
- // https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html#instance-metadata-security-credentials
- // (If that's not true, the returned ttl might be zero or
- // negative, which the caller can handle.)
- ttl := cred.Expiration.Sub(time.Now()) - 5*time.Minute
- v.logger.WithFields(logrus.Fields{
- "AccessKeyID": cred.AccessKeyID,
- "LastUpdated": cred.LastUpdated,
- "Expiration": cred.Expiration,
- "TTL": arvados.Duration(ttl),
- }).Debug("updated credentials")
- return ttl, nil
-}
-
-func (v *S3Volume) getReaderWithContext(ctx context.Context, key string) (rdr io.ReadCloser, err error) {
- ready := make(chan bool)
- go func() {
- rdr, err = v.getReader(key)
- close(ready)
- }()
- select {
- case <-ready:
- return
- case <-ctx.Done():
- v.logger.Debugf("s3: abandoning getReader(%s): %s", key, ctx.Err())
- go func() {
- <-ready
- if err == nil {
- rdr.Close()
- }
- }()
- return nil, ctx.Err()
- }
-}
-
-// getReader wraps (Bucket)GetReader.
-//
-// In situations where (Bucket)GetReader would fail because the block
-// disappeared in a Trash race, getReader calls fixRace to recover the
-// data, and tries again.
-func (v *S3Volume) getReader(key string) (rdr io.ReadCloser, err error) {
- rdr, err = v.bucket.GetReader(key)
- err = v.translateError(err)
- if err == nil || !os.IsNotExist(err) {
- return
- }
-
- _, err = v.bucket.Head("recent/"+key, nil)
- err = v.translateError(err)
- if err != nil {
- // If we can't read recent/X, there's no point in
- // trying fixRace. Give up.
- return
- }
- if !v.fixRace(key) {
- err = os.ErrNotExist
- return
- }
-
- rdr, err = v.bucket.GetReader(key)
- if err != nil {
- v.logger.Warnf("reading %s after successful fixRace: %s", key, err)
- err = v.translateError(err)
- }
- return
-}
-
-// Get a block: copy the block data into buf, and return the number of
-// bytes copied.
-func (v *S3Volume) Get(ctx context.Context, loc string, buf []byte) (int, error) {
- key := v.key(loc)
- rdr, err := v.getReaderWithContext(ctx, key)
- if err != nil {
- return 0, err
- }
-
- var n int
- ready := make(chan bool)
- go func() {
- defer close(ready)
-
- defer rdr.Close()
- n, err = io.ReadFull(rdr, buf)
-
- switch err {
- case nil, io.EOF, io.ErrUnexpectedEOF:
- err = nil
- default:
- err = v.translateError(err)
- }
- }()
- select {
- case <-ctx.Done():
- v.logger.Debugf("s3: interrupting ReadFull() with Close() because %s", ctx.Err())
- rdr.Close()
- // Must wait for ReadFull to return, to ensure it
- // doesn't write to buf after we return.
- v.logger.Debug("s3: waiting for ReadFull() to fail")
- <-ready
- return 0, ctx.Err()
- case <-ready:
- return n, err
- }
-}
-
-// Compare the given data with the stored data.
-func (v *S3Volume) Compare(ctx context.Context, loc string, expect []byte) error {
- key := v.key(loc)
- errChan := make(chan error, 1)
- go func() {
- _, err := v.bucket.Head("recent/"+key, nil)
- errChan <- err
- }()
- var err error
- select {
- case <-ctx.Done():
- return ctx.Err()
- case err = <-errChan:
- }
- if err != nil {
- // Checking for "loc" itself here would interfere with
- // future GET requests.
- //
- // On AWS, if X doesn't exist, a HEAD or GET request
- // for X causes X's non-existence to be cached. Thus,
- // if we test for X, then create X and return a
- // signature to our client, the client might still get
- // 404 from all keepstores when trying to read it.
- //
- // To avoid this, we avoid doing HEAD X or GET X until
- // we know X has been written.
- //
- // Note that X might exist even though recent/X
- // doesn't: for example, the response to HEAD recent/X
- // might itself come from a stale cache. In such
- // cases, we will return a false negative and
- // PutHandler might needlessly create another replica
- // on a different volume. That's not ideal, but it's
- // better than passing the eventually-consistent
- // problem on to our clients.
- return v.translateError(err)
- }
- rdr, err := v.getReaderWithContext(ctx, key)
- if err != nil {
- return err
- }
- defer rdr.Close()
- return v.translateError(compareReaderWithBuf(ctx, rdr, expect, loc[:32]))
-}
-
-// Put writes a block.
-func (v *S3Volume) Put(ctx context.Context, loc string, block []byte) error {
- if v.volume.ReadOnly {
- return MethodDisabledError
- }
- var opts s3.Options
- size := len(block)
- if size > 0 {
- md5, err := hex.DecodeString(loc)
- if err != nil {
- return err
- }
- opts.ContentMD5 = base64.StdEncoding.EncodeToString(md5)
- // In AWS regions that use V4 signatures, we need to
- // provide ContentSHA256 up front. Otherwise, the S3
- // library reads the request body (from our buffer)
- // into another new buffer in order to compute the
- // SHA256 before sending the request -- which would
- // mean consuming 128 MiB of memory for the duration
- // of a 64 MiB write.
- opts.ContentSHA256 = fmt.Sprintf("%x", sha256.Sum256(block))
- }
-
- key := v.key(loc)
-
- // Send the block data through a pipe, so that (if we need to)
- // we can close the pipe early and abandon our PutReader()
- // goroutine, without worrying about PutReader() accessing our
- // block buffer after we release it.
- bufr, bufw := io.Pipe()
- go func() {
- io.Copy(bufw, bytes.NewReader(block))
- bufw.Close()
- }()
-
- var err error
- ready := make(chan bool)
- go func() {
- defer func() {
- if ctx.Err() != nil {
- v.logger.Debugf("abandoned PutReader goroutine finished with err: %s", err)
- }
- }()
- defer close(ready)
- err = v.bucket.PutReader(key, bufr, int64(size), "application/octet-stream", s3ACL, opts)
- if err != nil {
- return
- }
- err = v.bucket.PutReader("recent/"+key, nil, 0, "application/octet-stream", s3ACL, s3.Options{})
- }()
- select {
- case <-ctx.Done():
- v.logger.Debugf("taking PutReader's input away: %s", ctx.Err())
- // Our pipe might be stuck in Write(), waiting for
- // PutReader() to read. If so, un-stick it. This means
- // PutReader will get corrupt data, but that's OK: the
- // size and MD5 won't match, so the write will fail.
- go io.Copy(ioutil.Discard, bufr)
- // CloseWithError() will return once pending I/O is done.
- bufw.CloseWithError(ctx.Err())
- v.logger.Debugf("abandoning PutReader goroutine")
- return ctx.Err()
- case <-ready:
- // Unblock pipe in case PutReader did not consume it.
- io.Copy(ioutil.Discard, bufr)
- return v.translateError(err)
- }
-}
-
-// Touch sets the timestamp for the given locator to the current time.
-func (v *S3Volume) Touch(loc string) error {
- if v.volume.ReadOnly {
- return MethodDisabledError
- }
- key := v.key(loc)
- _, err := v.bucket.Head(key, nil)
- err = v.translateError(err)
- if os.IsNotExist(err) && v.fixRace(key) {
- // The data object got trashed in a race, but fixRace
- // rescued it.
- } else if err != nil {
- return err
- }
- err = v.bucket.PutReader("recent/"+key, nil, 0, "application/octet-stream", s3ACL, s3.Options{})
- return v.translateError(err)
-}
-
-// Mtime returns the stored timestamp for the given locator.
-func (v *S3Volume) Mtime(loc string) (time.Time, error) {
- key := v.key(loc)
- _, err := v.bucket.Head(key, nil)
- if err != nil {
- return zeroTime, v.translateError(err)
- }
- resp, err := v.bucket.Head("recent/"+key, nil)
- err = v.translateError(err)
- if os.IsNotExist(err) {
- // The data object X exists, but recent/X is missing.
- err = v.bucket.PutReader("recent/"+key, nil, 0, "application/octet-stream", s3ACL, s3.Options{})
- if err != nil {
- v.logger.WithError(err).Errorf("error creating %q", "recent/"+key)
- return zeroTime, v.translateError(err)
- }
- v.logger.Infof("created %q to migrate existing block to new storage scheme", "recent/"+key)
- resp, err = v.bucket.Head("recent/"+key, nil)
- if err != nil {
- v.logger.WithError(err).Errorf("HEAD failed after creating %q", "recent/"+key)
- return zeroTime, v.translateError(err)
- }
- } else if err != nil {
- // HEAD recent/X failed for some other reason.
- return zeroTime, err
- }
- return v.lastModified(resp)
-}
-
-// IndexTo writes a complete list of locators with the given prefix
-// for which Get() can retrieve data.
-func (v *S3Volume) IndexTo(prefix string, writer io.Writer) error {
- // Use a merge sort to find matching sets of X and recent/X.
- dataL := s3Lister{
- Logger: v.logger,
- Bucket: v.bucket.Bucket(),
- Prefix: v.key(prefix),
- PageSize: v.IndexPageSize,
- Stats: &v.bucket.stats,
- }
- recentL := s3Lister{
- Logger: v.logger,
- Bucket: v.bucket.Bucket(),
- Prefix: "recent/" + v.key(prefix),
- PageSize: v.IndexPageSize,
- Stats: &v.bucket.stats,
- }
- for data, recent := dataL.First(), recentL.First(); data != nil && dataL.Error() == nil; data = dataL.Next() {
- if data.Key >= "g" {
- // Conveniently, "recent/*" and "trash/*" are
- // lexically greater than all hex-encoded data
- // hashes, so stopping here avoids iterating
- // over all of them needlessly with dataL.
- break
- }
- loc, isBlk := v.isKeepBlock(data.Key)
- if !isBlk {
- continue
- }
-
- // stamp is the list entry we should use to report the
- // last-modified time for this data block: it will be
- // the recent/X entry if one exists, otherwise the
- // entry for the data block itself.
- stamp := data
-
- // Advance to the corresponding recent/X marker, if any
- for recent != nil && recentL.Error() == nil {
- if cmp := strings.Compare(recent.Key[7:], data.Key); cmp < 0 {
- recent = recentL.Next()
- continue
- } else if cmp == 0 {
- stamp = recent
- recent = recentL.Next()
- break
- } else {
- // recent/X marker is missing: we'll
- // use the timestamp on the data
- // object.
- break
- }
- }
- if err := recentL.Error(); err != nil {
- return err
- }
- t, err := time.Parse(time.RFC3339, stamp.LastModified)
- if err != nil {
- return err
- }
- // We truncate sub-second precision here. Otherwise
- // timestamps will never match the RFC1123-formatted
- // Last-Modified values parsed by Mtime().
- fmt.Fprintf(writer, "%s+%d %d\n", loc, data.Size, t.Unix()*1000000000)
- }
- return dataL.Error()
-}
-
-// Trash a Keep block.
-func (v *S3Volume) Trash(loc string) error {
- if v.volume.ReadOnly {
- return MethodDisabledError
- }
- if t, err := v.Mtime(loc); err != nil {
- return err
- } else if time.Since(t) < v.cluster.Collections.BlobSigningTTL.Duration() {
- return nil
- }
- key := v.key(loc)
- if v.cluster.Collections.BlobTrashLifetime == 0 {
- if !v.UnsafeDelete {
- return ErrS3TrashDisabled
- }
- return v.translateError(v.bucket.Del(key))
- }
- err := v.checkRaceWindow(key)
- if err != nil {
- return err
- }
- err = v.safeCopy("trash/"+key, key)
- if err != nil {
- return err
- }
- return v.translateError(v.bucket.Del(key))
-}
-
-// checkRaceWindow returns a non-nil error if trash/key is, or might
-// be, in the race window (i.e., it's not safe to trash key).
-func (v *S3Volume) checkRaceWindow(key string) error {
- resp, err := v.bucket.Head("trash/"+key, nil)
- err = v.translateError(err)
- if os.IsNotExist(err) {
- // OK, trash/X doesn't exist so we're not in the race
- // window
- return nil
- } else if err != nil {
- // Error looking up trash/X. We don't know whether
- // we're in the race window
- return err
- }
- t, err := v.lastModified(resp)
- if err != nil {
- // Can't parse timestamp
- return err
- }
- safeWindow := t.Add(v.cluster.Collections.BlobTrashLifetime.Duration()).Sub(time.Now().Add(time.Duration(v.RaceWindow)))
- if safeWindow <= 0 {
- // We can't count on "touch trash/X" to prolong
- // trash/X's lifetime. The new timestamp might not
- // become visible until now+raceWindow, and EmptyTrash
- // is allowed to delete trash/X before then.
- return fmt.Errorf("%s: same block is already in trash, and safe window ended %s ago", key, -safeWindow)
- }
- // trash/X exists, but it won't be eligible for deletion until
- // after now+raceWindow, so it's safe to overwrite it.
- return nil
-}
-
-// safeCopy calls PutCopy, and checks the response to make sure the
-// copy succeeded and updated the timestamp on the destination object
-// (PutCopy returns 200 OK if the request was received, even if the
-// copy failed).
-func (v *S3Volume) safeCopy(dst, src string) error {
- resp, err := v.bucket.Bucket().PutCopy(dst, s3ACL, s3.CopyOptions{
- ContentType: "application/octet-stream",
- MetadataDirective: "REPLACE",
- }, v.bucket.Bucket().Name+"/"+src)
- err = v.translateError(err)
- if os.IsNotExist(err) {
- return err
- } else if err != nil {
- return fmt.Errorf("PutCopy(%q ← %q): %s", dst, v.bucket.Bucket().Name+"/"+src, err)
- }
- if t, err := time.Parse(time.RFC3339Nano, resp.LastModified); err != nil {
- return fmt.Errorf("PutCopy succeeded but did not return a timestamp: %q: %s", resp.LastModified, err)
- } else if time.Now().Sub(t) > maxClockSkew {
- return fmt.Errorf("PutCopy succeeded but returned an old timestamp: %q: %s", resp.LastModified, t)
- }
- return nil
-}
-
-// Get the LastModified header from resp, and parse it as RFC1123 or
-// -- if it isn't valid RFC1123 -- as Amazon's variant of RFC1123.
-func (v *S3Volume) lastModified(resp *http.Response) (t time.Time, err error) {
- s := resp.Header.Get("Last-Modified")
- t, err = time.Parse(time.RFC1123, s)
- if err != nil && s != "" {
- // AWS example is "Sun, 1 Jan 2006 12:00:00 GMT",
- // which isn't quite "Sun, 01 Jan 2006 12:00:00 GMT"
- // as required by HTTP spec. If it's not a valid HTTP
- // header value, it's probably AWS (or s3test) giving
- // us a nearly-RFC1123 timestamp.
- t, err = time.Parse(nearlyRFC1123, s)
- }
- return
-}
-
-// Untrash moves block from trash back into store
-func (v *S3Volume) Untrash(loc string) error {
- key := v.key(loc)
- err := v.safeCopy(key, "trash/"+key)
- if err != nil {
- return err
- }
- err = v.bucket.PutReader("recent/"+key, nil, 0, "application/octet-stream", s3ACL, s3.Options{})
- return v.translateError(err)
-}
-
-// Status returns a *VolumeStatus representing the current in-use
-// storage capacity and a fake available capacity that doesn't make
-// the volume seem full or nearly-full.
-func (v *S3Volume) Status() *VolumeStatus {
- return &VolumeStatus{
- DeviceNum: 1,
- BytesFree: BlockSize * 1000,
- BytesUsed: 1,
- }
-}
-
-// InternalStats returns bucket I/O and API call counters.
-func (v *S3Volume) InternalStats() interface{} {
- return &v.bucket.stats
-}
-
-// String implements fmt.Stringer.
-func (v *S3Volume) String() string {
- return fmt.Sprintf("s3-bucket:%+q", v.Bucket)
-}
-
-var s3KeepBlockRegexp = regexp.MustCompile(`^[0-9a-f]{32}$`)
-
-func (v *S3Volume) isKeepBlock(s string) (string, bool) {
- if v.PrefixLength > 0 && len(s) == v.PrefixLength+33 && s[:v.PrefixLength] == s[v.PrefixLength+1:v.PrefixLength*2+1] {
- s = s[v.PrefixLength+1:]
- }
- return s, s3KeepBlockRegexp.MatchString(s)
-}
-
-// Return the key used for a given loc. If PrefixLength==0 then
-// key("abcdef0123") is "abcdef0123", if PrefixLength==3 then key is
-// "abc/abcdef0123", etc.
-func (v *S3Volume) key(loc string) string {
- if v.PrefixLength > 0 && v.PrefixLength < len(loc)-1 {
- return loc[:v.PrefixLength] + "/" + loc
- } else {
- return loc
- }
-}
-
-// fixRace(X) is called when "recent/X" exists but "X" doesn't
-// exist. If the timestamps on "recent/X" and "trash/X" indicate there
-// was a race between Put and Trash, fixRace recovers from the race by
-// Untrashing the block.
-func (v *S3Volume) fixRace(key string) bool {
- trash, err := v.bucket.Head("trash/"+key, nil)
- if err != nil {
- if !os.IsNotExist(v.translateError(err)) {
- v.logger.WithError(err).Errorf("fixRace: HEAD %q failed", "trash/"+key)
- }
- return false
- }
- trashTime, err := v.lastModified(trash)
- if err != nil {
- v.logger.WithError(err).Errorf("fixRace: error parsing time %q", trash.Header.Get("Last-Modified"))
- return false
- }
-
- recent, err := v.bucket.Head("recent/"+key, nil)
- if err != nil {
- v.logger.WithError(err).Errorf("fixRace: HEAD %q failed", "recent/"+key)
- return false
- }
- recentTime, err := v.lastModified(recent)
- if err != nil {
- v.logger.WithError(err).Errorf("fixRace: error parsing time %q", recent.Header.Get("Last-Modified"))
- return false
- }
-
- ageWhenTrashed := trashTime.Sub(recentTime)
- if ageWhenTrashed >= v.cluster.Collections.BlobSigningTTL.Duration() {
- // No evidence of a race: block hasn't been written
- // since it became eligible for Trash. No fix needed.
- return false
- }
-
- v.logger.Infof("fixRace: %q: trashed at %s but touched at %s (age when trashed = %s < %s)", key, trashTime, recentTime, ageWhenTrashed, v.cluster.Collections.BlobSigningTTL)
- v.logger.Infof("fixRace: copying %q to %q to recover from race between Put/Touch and Trash", "recent/"+key, key)
- err = v.safeCopy(key, "trash/"+key)
- if err != nil {
- v.logger.WithError(err).Error("fixRace: copy failed")
- return false
- }
- return true
-}
-
-func (v *S3Volume) translateError(err error) error {
- switch err := err.(type) {
- case *s3.Error:
- if (err.StatusCode == http.StatusNotFound && err.Code == "NoSuchKey") ||
- strings.Contains(err.Error(), "Not Found") {
- return os.ErrNotExist
- }
- // Other 404 errors like NoSuchVersion and
- // NoSuchBucket are different problems which should
- // get called out downstream, so we don't convert them
- // to os.ErrNotExist.
- }
- return err
-}
-
-// EmptyTrash looks for trashed blocks that exceeded BlobTrashLifetime
-// and deletes them from the volume.
-func (v *S3Volume) EmptyTrash() {
- if v.cluster.Collections.BlobDeleteConcurrency < 1 {
- return
- }
-
- var bytesInTrash, blocksInTrash, bytesDeleted, blocksDeleted int64
-
- // Define "ready to delete" as "...when EmptyTrash started".
- startT := time.Now()
-
- emptyOneKey := func(trash *s3.Key) {
- key := trash.Key[6:]
- loc, isBlk := v.isKeepBlock(key)
- if !isBlk {
- return
- }
- atomic.AddInt64(&bytesInTrash, trash.Size)
- atomic.AddInt64(&blocksInTrash, 1)
-
- trashT, err := time.Parse(time.RFC3339, trash.LastModified)
- if err != nil {
- v.logger.Warnf("EmptyTrash: %q: parse %q: %s", trash.Key, trash.LastModified, err)
- return
- }
- recent, err := v.bucket.Head("recent/"+key, nil)
- if err != nil && os.IsNotExist(v.translateError(err)) {
- v.logger.Warnf("EmptyTrash: found trash marker %q but no %q (%s); calling Untrash", trash.Key, "recent/"+loc, err)
- err = v.Untrash(loc)
- if err != nil {
- v.logger.WithError(err).Errorf("EmptyTrash: Untrash(%q) failed", loc)
- }
- return
- } else if err != nil {
- v.logger.WithError(err).Warnf("EmptyTrash: HEAD %q failed", "recent/"+key)
- return
- }
- recentT, err := v.lastModified(recent)
- if err != nil {
- v.logger.WithError(err).Warnf("EmptyTrash: %q: error parsing %q", "recent/"+key, recent.Header.Get("Last-Modified"))
- return
- }
- if trashT.Sub(recentT) < v.cluster.Collections.BlobSigningTTL.Duration() {
- if age := startT.Sub(recentT); age >= v.cluster.Collections.BlobSigningTTL.Duration()-time.Duration(v.RaceWindow) {
- // recent/loc is too old to protect
- // loc from being Trashed again during
- // the raceWindow that starts if we
- // delete trash/X now.
- //
- // Note this means (TrashSweepInterval
- // < BlobSigningTTL - raceWindow) is
- // necessary to avoid starvation.
- v.logger.Infof("EmptyTrash: detected old race for %q, calling fixRace + Touch", loc)
- v.fixRace(key)
- v.Touch(loc)
- return
- }
- _, err := v.bucket.Head(key, nil)
- if os.IsNotExist(err) {
- v.logger.Infof("EmptyTrash: detected recent race for %q, calling fixRace", loc)
- v.fixRace(key)
- return
- } else if err != nil {
- v.logger.WithError(err).Warnf("EmptyTrash: HEAD %q failed", loc)
- return
- }
- }
- if startT.Sub(trashT) < v.cluster.Collections.BlobTrashLifetime.Duration() {
- return
- }
- err = v.bucket.Del(trash.Key)
- if err != nil {
- v.logger.WithError(err).Errorf("EmptyTrash: error deleting %q", trash.Key)
- return
- }
- atomic.AddInt64(&bytesDeleted, trash.Size)
- atomic.AddInt64(&blocksDeleted, 1)
-
- _, err = v.bucket.Head(key, nil)
- if err == nil {
- v.logger.Warnf("EmptyTrash: HEAD %q succeeded immediately after deleting %q", key, key)
- return
- }
- if !os.IsNotExist(v.translateError(err)) {
- v.logger.WithError(err).Warnf("EmptyTrash: HEAD %q failed", key)
- return
- }
- err = v.bucket.Del("recent/" + key)
- if err != nil {
- v.logger.WithError(err).Warnf("EmptyTrash: error deleting %q", "recent/"+key)
- }
- }
-
- var wg sync.WaitGroup
- todo := make(chan *s3.Key, v.cluster.Collections.BlobDeleteConcurrency)
- for i := 0; i < v.cluster.Collections.BlobDeleteConcurrency; i++ {
- wg.Add(1)
- go func() {
- defer wg.Done()
- for key := range todo {
- emptyOneKey(key)
- }
- }()
- }
-
- trashL := s3Lister{
- Logger: v.logger,
- Bucket: v.bucket.Bucket(),
- Prefix: "trash/",
- PageSize: v.IndexPageSize,
- Stats: &v.bucket.stats,
- }
- for trash := trashL.First(); trash != nil; trash = trashL.Next() {
- todo <- trash
- }
- close(todo)
- wg.Wait()
-
- if err := trashL.Error(); err != nil {
- v.logger.WithError(err).Error("EmptyTrash: lister failed")
- }
- v.logger.Infof("EmptyTrash stats for %v: Deleted %v bytes in %v blocks. Remaining in trash: %v bytes in %v blocks.", v.String(), bytesDeleted, blocksDeleted, bytesInTrash-bytesDeleted, blocksInTrash-blocksDeleted)
-}
-
-type s3Lister struct {
- Logger logrus.FieldLogger
- Bucket *s3.Bucket
- Prefix string
- PageSize int
- Stats *s3bucketStats
- nextMarker string
- buf []s3.Key
- err error
-}
-
-// First fetches the first page and returns the first item. It returns
-// nil if the response is the empty set or an error occurs.
-func (lister *s3Lister) First() *s3.Key {
- lister.getPage()
- return lister.pop()
-}
-
-// Next returns the next item, fetching the next page if necessary. It
-// returns nil if the last available item has already been fetched, or
-// an error occurs.
-func (lister *s3Lister) Next() *s3.Key {
- if len(lister.buf) == 0 && lister.nextMarker != "" {
- lister.getPage()
- }
- return lister.pop()
-}
-
-// Return the most recent error encountered by First or Next.
-func (lister *s3Lister) Error() error {
- return lister.err
-}
-
-func (lister *s3Lister) getPage() {
- lister.Stats.TickOps("list")
- lister.Stats.Tick(&lister.Stats.Ops, &lister.Stats.ListOps)
- resp, err := lister.Bucket.List(lister.Prefix, "", lister.nextMarker, lister.PageSize)
- lister.nextMarker = ""
- if err != nil {
- lister.err = err
- return
- }
- if resp.IsTruncated {
- lister.nextMarker = resp.NextMarker
- }
- lister.buf = make([]s3.Key, 0, len(resp.Contents))
- for _, key := range resp.Contents {
- if !strings.HasPrefix(key.Key, lister.Prefix) {
- lister.Logger.Warnf("s3Lister: S3 Bucket.List(prefix=%q) returned key %q", lister.Prefix, key.Key)
- continue
- }
- lister.buf = append(lister.buf, key)
- }
-}
-
-func (lister *s3Lister) pop() (k *s3.Key) {
- if len(lister.buf) > 0 {
- k = &lister.buf[0]
- lister.buf = lister.buf[1:]
- }
- return
-}
-
-// s3bucket wraps s3.bucket and counts I/O and API usage stats. The
-// wrapped bucket can be replaced atomically with SetBucket in order
-// to update credentials.
-type s3bucket struct {
- bucket *s3.Bucket
- stats s3bucketStats
- mu sync.Mutex
-}
-
-func (b *s3bucket) Bucket() *s3.Bucket {
- b.mu.Lock()
- defer b.mu.Unlock()
- return b.bucket
-}
-
-func (b *s3bucket) SetBucket(bucket *s3.Bucket) {
- b.mu.Lock()
- defer b.mu.Unlock()
- b.bucket = bucket
-}
-
-func (b *s3bucket) GetReader(path string) (io.ReadCloser, error) {
- rdr, err := b.Bucket().GetReader(path)
- b.stats.TickOps("get")
- b.stats.Tick(&b.stats.Ops, &b.stats.GetOps)
- b.stats.TickErr(err)
- return NewCountingReader(rdr, b.stats.TickInBytes), err
-}
-
-func (b *s3bucket) Head(path string, headers map[string][]string) (*http.Response, error) {
- resp, err := b.Bucket().Head(path, headers)
- b.stats.TickOps("head")
- b.stats.Tick(&b.stats.Ops, &b.stats.HeadOps)
- b.stats.TickErr(err)
- return resp, err
-}
-
-func (b *s3bucket) PutReader(path string, r io.Reader, length int64, contType string, perm s3.ACL, options s3.Options) error {
- if length == 0 {
- // goamz will only send Content-Length: 0 when reader
- // is nil due to net.http.Request.ContentLength
- // behavior. Otherwise, Content-Length header is
- // omitted which will cause some S3 services
- // (including AWS and Ceph RadosGW) to fail to create
- // empty objects.
- r = nil
- } else {
- r = NewCountingReader(r, b.stats.TickOutBytes)
- }
- err := b.Bucket().PutReader(path, r, length, contType, perm, options)
- b.stats.TickOps("put")
- b.stats.Tick(&b.stats.Ops, &b.stats.PutOps)
- b.stats.TickErr(err)
- return err
-}
-
-func (b *s3bucket) Del(path string) error {
- err := b.Bucket().Del(path)
- b.stats.TickOps("delete")
- b.stats.Tick(&b.stats.Ops, &b.stats.DelOps)
- b.stats.TickErr(err)
- return err
-}
-
-type s3bucketStats struct {
- statsTicker
- Ops uint64
- GetOps uint64
- PutOps uint64
- HeadOps uint64
- DelOps uint64
- ListOps uint64
-}
-
-func (s *s3bucketStats) TickErr(err error) {
- if err == nil {
- return
- }
- errType := fmt.Sprintf("%T", err)
- if err, ok := err.(*s3.Error); ok {
- errType = errType + fmt.Sprintf(" %d %s", err.StatusCode, err.Code)
- }
- s.statsTicker.TickErr(err, errType)
-}
projects / arvados.git / blobdiff