[feature] allow uncaching of other media types (#1234)

* simplify pruneRemote, remove unncecessary media trace logging, update RemoteOlderThan() to include headers/avis

Signed-off-by: kim <grufwub@gmail.com>

* cleanup pruneallmeta, add remote header to pruneremote tests

Signed-off-by: kim <grufwub@gmail.com>

* fix olderthan duration additions

Signed-off-by: kim <grufwub@gmail.com>

* fix broken test now that test model header changed

Signed-off-by: kim <grufwub@gmail.com>

* instead use new remote test account for new header model

Signed-off-by: kim <grufwub@gmail.com>

* use newer generated ULID for remote_account_3 to ensure it is sorted last

Signed-off-by: kim <grufwub@gmail.com>

* reorganize serialized keys to match expected test account model order

Signed-off-by: kim <grufwub@gmail.com>

Signed-off-by: kim <grufwub@gmail.com>

9 files changed, 107 insertions, 110 deletions

diff --git a/internal/db/bundb/media.go b/internal/db/bundb/media.go
index 39e0ad0e3..3be7be39a 100644
--- a/internal/db/bundb/media.go
+++ b/internal/db/bundb/media.go
@@ -57,8 +57,6 @@ func (m *mediaDB) GetRemoteOlderThan(ctx context.Context, olderThan time.Time, l
 		NewSelect().
 		Model(&attachments).
 		Where("? = ?", bun.Ident("media_attachment.cached"), true).
-		Where("? = ?", bun.Ident("media_attachment.avatar"), false).
-		Where("? = ?", bun.Ident("media_attachment.header"), false).
 		Where("? < ?", bun.Ident("media_attachment.created_at"), olderThan).
 		WhereGroup(" AND ", whereNotEmptyAndNotNull("media_attachment.remote_url")).
 		Order("media_attachment.created_at DESC")
@@ -70,6 +68,7 @@ func (m *mediaDB) GetRemoteOlderThan(ctx context.Context, olderThan time.Time, l
 	if err := q.Scan(ctx); err != nil {
 		return nil, m.conn.ProcessError(err)
 	}
+
 	return attachments, nil
 }
 
diff --git a/internal/db/bundb/media_test.go b/internal/db/bundb/media_test.go
index d6a4981f8..1676954ce 100644
--- a/internal/db/bundb/media_test.go
+++ b/internal/db/bundb/media_test.go
@@ -41,7 +41,7 @@ func (suite *MediaTestSuite) TestGetAttachmentByID() {
 func (suite *MediaTestSuite) TestGetOlder() {
 	attachments, err := suite.db.GetRemoteOlderThan(context.Background(), time.Now(), 20)
 	suite.NoError(err)
-	suite.Len(attachments, 2)
+	suite.Len(attachments, 3)
 }
 
 func (suite *MediaTestSuite) TestGetAvisAndHeaders() {
@@ -49,7 +49,7 @@ func (suite *MediaTestSuite) TestGetAvisAndHeaders() {
 
 	attachments, err := suite.db.GetAvatarsAndHeaders(ctx, "", 20)
 	suite.NoError(err)
-	suite.Len(attachments, 2)
+	suite.Len(attachments, 3)
 }
 
 func (suite *MediaTestSuite) TestGetLocalUnattachedOlderThan() {
diff --git a/internal/db/media.go b/internal/db/media.go
index 2f9ed79dc..2d4fbb441 100644
--- a/internal/db/media.go
+++ b/internal/db/media.go
@@ -29,18 +29,20 @@ import (
 type Media interface {
 	// GetAttachmentByID gets a single attachment by its ID
 	GetAttachmentByID(ctx context.Context, id string) (*gtsmodel.MediaAttachment, Error)
-	// GetRemoteOlderThan gets limit n remote media attachments older than the given olderThan time.
-	// These will be returned in order of attachment.created_at descending (newest to oldest in other words).
+
+	// GetRemoteOlderThan gets limit n remote media attachments (including avatars and headers) older than the given
+	// olderThan time. These will be returned in order of attachment.created_at descending (newest to oldest in other words).
 	//
 	// The selected media attachments will be those with both a URL and a RemoteURL filled in.
 	// In other words, media attachments that originated remotely, and that we currently have cached locally.
 	GetRemoteOlderThan(ctx context.Context, olderThan time.Time, limit int) ([]*gtsmodel.MediaAttachment, Error)
+
 	// GetAvatarsAndHeaders fetches limit n avatars and headers with an id < maxID. These headers
 	// and avis may be in use or not; the caller should check this if it's important.
 	GetAvatarsAndHeaders(ctx context.Context, maxID string, limit int) ([]*gtsmodel.MediaAttachment, Error)
-	// GetLocalUnattachedOlderThan fetches limit n local media attachments, older than the given time, which
-	// aren't header or avatars, and aren't attached to a status. In other words, attachments which were uploaded
-	// but never used for whatever reason, or attachments that were attached to a status which was subsequently
-	// deleted.
+
+	// GetLocalUnattachedOlderThan fetches limit n local media attachments (including avatars and headers), older than
+	// the given time, which aren't header or avatars, and aren't attached to a status. In other words, attachments which were
+	// uploaded but never used for whatever reason, or attachments that were attached to a status which was subsequently deleted.
 	GetLocalUnattachedOlderThan(ctx context.Context, olderThan time.Time, maxID string, limit int) ([]*gtsmodel.MediaAttachment, Error)
 }
diff --git a/internal/media/processingmedia.go b/internal/media/processingmedia.go
index 1fd9423f5..94c8f9a7a 100644
--- a/internal/media/processingmedia.go
+++ b/internal/media/processingmedia.go
@@ -81,10 +81,8 @@ func (p *ProcessingMedia) AttachmentID() string {
 // LoadAttachment blocks until the thumbnail and fullsize content
 // has been processed, and then returns the completed attachment.
 func (p *ProcessingMedia) LoadAttachment(ctx context.Context) (*gtsmodel.MediaAttachment, error) {
-	log.Tracef("LoadAttachment: getting lock for attachment %s", p.attachment.URL)
 	p.mu.Lock()
 	defer p.mu.Unlock()
-	log.Tracef("LoadAttachment: got lock for attachment %s", p.attachment.URL)
 
 	if err := p.store(ctx); err != nil {
 		return nil, err
@@ -98,23 +96,24 @@ func (p *ProcessingMedia) LoadAttachment(ctx context.Context) (*gtsmodel.MediaAt
 		return nil, err
 	}
 
-	// store the result in the database before returning it
 	if !p.insertedInDB {
 		if p.recache {
-			// if it's a recache we should only need to update
+			// This is an existing media attachment we're recaching, so only need to update it
 			if err := p.database.UpdateByID(ctx, p.attachment, p.attachment.ID); err != nil {
 				return nil, err
 			}
 		} else {
-			// otherwise we need to really PUT it
+			// This is a new media attachment we're caching for first time
 			if err := p.database.Put(ctx, p.attachment); err != nil {
 				return nil, err
 			}
 		}
+
+		// Mark this as stored in DB
 		p.insertedInDB = true
 	}
 
-	log.Tracef("LoadAttachment: finished, returning attachment %s", p.attachment.URL)
+	log.Tracef("finished loading attachment %s", p.attachment.URL)
 	return p.attachment, nil
 }
 
@@ -180,7 +179,7 @@ func (p *ProcessingMedia) loadThumb(ctx context.Context) error {
 
 		// we're done processing the thumbnail!
 		atomic.StoreInt32(&p.thumbState, int32(complete))
-		log.Tracef("loadThumb: finished processing thumbnail for attachment %s", p.attachment.URL)
+		log.Tracef("finished processing thumbnail for attachment %s", p.attachment.URL)
 		fallthrough
 	case complete:
 		return nil
@@ -241,7 +240,7 @@ func (p *ProcessingMedia) loadFullSize(ctx context.Context) error {
 
 		// we're done processing the full-size image
 		atomic.StoreInt32(&p.fullSizeState, int32(complete))
-		log.Tracef("loadFullSize: finished processing full size image for attachment %s", p.attachment.URL)
+		log.Tracef("finished processing full size image for attachment %s", p.attachment.URL)
 		fallthrough
 	case complete:
 		return nil
@@ -362,7 +361,7 @@ func (p *ProcessingMedia) store(ctx context.Context) error {
 	p.attachment.File.FileSize = int(fileSize)
 	p.read = true
 
-	log.Tracef("store: finished storing initial data for attachment %s", p.attachment.URL)
+	log.Tracef("finished storing initial data for attachment %s", p.attachment.URL)
 	return nil
 }
 
diff --git a/internal/media/prunemeta.go b/internal/media/prunemeta.go
index 69d79b8d9..19fbb7e7e 100644
--- a/internal/media/prunemeta.go
+++ b/internal/media/prunemeta.go
@@ -20,6 +20,7 @@ package media
 
 import (
 	"context"
+	"errors"
 
 	"codeberg.org/gruf/go-store/v2/storage"
 	"github.com/superseriousbusiness/gotosocial/internal/db"
@@ -28,17 +29,23 @@ import (
 )
 
 func (m *manager) PruneAllMeta(ctx context.Context) (int, error) {
-	var totalPruned int
-	var maxID string
-	var attachments []*gtsmodel.MediaAttachment
-	var err error
+	var (
+		totalPruned int
+		maxID       string
+	)
+
+	for {
+		// select "selectPruneLimit" headers / avatars at a time for pruning
+		attachments, err := m.db.GetAvatarsAndHeaders(ctx, maxID, selectPruneLimit)
+		if err != nil && !errors.Is(err, db.ErrNoEntries) {
+			return totalPruned, err
+		} else if len(attachments) == 0 {
+			break
+		}
 
-	// select 20 attachments at a time and prune them
-	for attachments, err = m.db.GetAvatarsAndHeaders(ctx, maxID, selectPruneLimit); err == nil && len(attachments) != 0; attachments, err = m.db.GetAvatarsAndHeaders(ctx, maxID, selectPruneLimit) {
 		// use the id of the last attachment in the slice as the next 'maxID' value
-		l := len(attachments)
-		log.Tracef("PruneAllMeta: got %d attachments with maxID < %s", l, maxID)
-		maxID = attachments[l-1].ID
+		log.Tracef("PruneAllMeta: got %d attachments with maxID < %s", len(attachments), maxID)
+		maxID = attachments[len(attachments)-1].ID
 
 		// prune each attachment that meets one of the following criteria:
 		// - has no owning account in the database
@@ -56,11 +63,6 @@ func (m *manager) PruneAllMeta(ctx context.Context) (int, error) {
 		}
 	}
 
-	// make sure we don't have a real error when we leave the loop
-	if err != nil && err != db.ErrNoEntries {
-		return totalPruned, err
-	}
-
 	log.Infof("PruneAllMeta: finished pruning avatars + headers: pruned %d entries", totalPruned)
 	return totalPruned, nil
 }
diff --git a/internal/media/pruneremote.go b/internal/media/pruneremote.go
index 011ed1dd7..f6108588f 100644
--- a/internal/media/pruneremote.go
+++ b/internal/media/pruneremote.go
@@ -20,7 +20,8 @@ package media
 
 import (
 	"context"
-	"fmt"
+	"errors"
+	"time"
 
 	"codeberg.org/gruf/go-store/v2/storage"
 	"github.com/superseriousbusiness/gotosocial/internal/db"
@@ -31,21 +32,23 @@ import (
 func (m *manager) PruneAllRemote(ctx context.Context, olderThanDays int) (int, error) {
 	var totalPruned int
 
-	olderThan, err := parseOlderThan(olderThanDays)
-	if err != nil {
-		return totalPruned, fmt.Errorf("PruneAllRemote: error parsing olderThanDays %d: %s", olderThanDays, err)
-	}
+	olderThan := time.Now().Add(-time.Hour * 24 * time.Duration(olderThanDays))
 	log.Infof("PruneAllRemote: pruning media older than %s", olderThan)
 
-	// select 20 attachments at a time and prune them
-	for attachments, err := m.db.GetRemoteOlderThan(ctx, olderThan, selectPruneLimit); err == nil && len(attachments) != 0; attachments, err = m.db.GetRemoteOlderThan(ctx, olderThan, selectPruneLimit) {
+	for {
+		// Select "selectPruneLimit" status attacchments at a time for pruning
+		attachments, err := m.db.GetRemoteOlderThan(ctx, olderThan, selectPruneLimit)
+		if err != nil && !errors.Is(err, db.ErrNoEntries) {
+			return totalPruned, err
+		} else if len(attachments) == 0 {
+			break
+		}
 
-		// use the age of the oldest attachment (the last one in the slice) as the next 'older than' value
-		l := len(attachments)
-		log.Tracef("PruneAllRemote: got %d attachments older than %s", l, olderThan)
-		olderThan = attachments[l-1].CreatedAt
+		// use the age of the oldest attachment (last in slice) as the next 'olderThan' value
+		log.Tracef("PruneAllRemote: got %d status attachments older than %s", len(attachments), olderThan)
+		olderThan = attachments[len(attachments)-1].CreatedAt
 
-		// prune each attachment
+		// prune each status attachment
 		for _, attachment := range attachments {
 			if err := m.pruneOneRemote(ctx, attachment); err != nil {
 				return totalPruned, err
@@ -54,11 +57,6 @@ func (m *manager) PruneAllRemote(ctx context.Context, olderThanDays int) (int, e
 		}
 	}
 
-	// make sure we don't have a real error when we leave the loop
-	if err != nil && err != db.ErrNoEntries {
-		return totalPruned, err
-	}
-
 	log.Infof("PruneAllRemote: finished pruning remote media: pruned %d entries", totalPruned)
 	return totalPruned, nil
 }
@@ -69,7 +67,7 @@ func (m *manager) pruneOneRemote(ctx context.Context, attachment *gtsmodel.Media
 	if attachment.File.Path != "" {
 		// delete the full size attachment from storage
 		log.Tracef("pruneOneRemote: deleting %s", attachment.File.Path)
-		if err := m.storage.Delete(ctx, attachment.File.Path); err != nil && err != storage.ErrNotFound {
+		if err := m.storage.Delete(ctx, attachment.File.Path); err != nil && !errors.Is(err, storage.ErrNotFound) {
 			return err
 		}
 		cached := false
@@ -80,7 +78,7 @@ func (m *manager) pruneOneRemote(ctx context.Context, attachment *gtsmodel.Media
 	if attachment.Thumbnail.Path != "" {
 		// delete the thumbnail from storage
 		log.Tracef("pruneOneRemote: deleting %s", attachment.Thumbnail.Path)
-		if err := m.storage.Delete(ctx, attachment.Thumbnail.Path); err != nil && err != storage.ErrNotFound {
+		if err := m.storage.Delete(ctx, attachment.Thumbnail.Path); err != nil && !errors.Is(err, storage.ErrNotFound) {
 			return err
 		}
 		cached := false
@@ -88,10 +86,10 @@ func (m *manager) pruneOneRemote(ctx context.Context, attachment *gtsmodel.Media
 		changed = true
 	}
 
-	// update the attachment to reflect that we no longer have it cached
-	if changed {
-		return m.db.UpdateByID(ctx, attachment, attachment.ID, "updated_at", "cached")
+	if !changed {
+		return nil
 	}
 
-	return nil
+	// update the attachment to reflect that we no longer have it cached
+	return m.db.UpdateByID(ctx, attachment, attachment.ID, "updated_at", "cached")
 }
diff --git a/internal/media/pruneremote_test.go b/internal/media/pruneremote_test.go
index 4af01c1c5..d4365f72c 100644
--- a/internal/media/pruneremote_test.go
+++ b/internal/media/pruneremote_test.go
@@ -27,6 +27,7 @@ import (
 
 	"codeberg.org/gruf/go-store/v2/storage"
 	"github.com/stretchr/testify/suite"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
 )
 
 type PruneRemoteTestSuite struct {
@@ -34,24 +35,29 @@ type PruneRemoteTestSuite struct {
 }
 
 func (suite *PruneRemoteTestSuite) TestPruneRemote() {
-	testAttachment := suite.testAttachments["remote_account_1_status_1_attachment_1"]
-	suite.True(*testAttachment.Cached)
+	testStatusAttachment := suite.testAttachments["remote_account_1_status_1_attachment_1"]
+	suite.True(*testStatusAttachment.Cached)
+
+	testHeader := suite.testAttachments["remote_account_3_header"]
+	suite.True(*testHeader.Cached)
 
 	totalPruned, err := suite.manager.PruneAllRemote(context.Background(), 1)
 	suite.NoError(err)
-	suite.Equal(2, totalPruned)
+	suite.Equal(3, totalPruned)
 
-	prunedAttachment, err := suite.db.GetAttachmentByID(context.Background(), testAttachment.ID)
+	prunedAttachment, err := suite.db.GetAttachmentByID(context.Background(), testStatusAttachment.ID)
 	suite.NoError(err)
+	suite.False(*prunedAttachment.Cached)
 
-	// the media should no longer be cached
+	prunedAttachment, err = suite.db.GetAttachmentByID(context.Background(), testHeader.ID)
+	suite.NoError(err)
 	suite.False(*prunedAttachment.Cached)
 }
 
 func (suite *PruneRemoteTestSuite) TestPruneRemoteTwice() {
 	totalPruned, err := suite.manager.PruneAllRemote(context.Background(), 1)
 	suite.NoError(err)
-	suite.Equal(2, totalPruned)
+	suite.Equal(3, totalPruned)
 
 	// final prune should prune nothing, since the first prune already happened
 	totalPrunedAgain, err := suite.manager.PruneAllRemote(context.Background(), 1)
@@ -61,16 +67,21 @@ func (suite *PruneRemoteTestSuite) TestPruneRemoteTwice() {
 
 func (suite *PruneRemoteTestSuite) TestPruneAndRecache() {
 	ctx := context.Background()
-	testAttachment := suite.testAttachments["remote_account_1_status_1_attachment_1"]
+	testStatusAttachment := suite.testAttachments["remote_account_1_status_1_attachment_1"]
+	testHeader := suite.testAttachments["remote_account_3_header"]
 
 	totalPruned, err := suite.manager.PruneAllRemote(ctx, 1)
 	suite.NoError(err)
-	suite.Equal(2, totalPruned)
+	suite.Equal(3, totalPruned)
 
 	// media should no longer be stored
-	_, err = suite.storage.Get(ctx, testAttachment.File.Path)
+	_, err = suite.storage.Get(ctx, testStatusAttachment.File.Path)
 	suite.ErrorIs(err, storage.ErrNotFound)
-	_, err = suite.storage.Get(ctx, testAttachment.Thumbnail.Path)
+	_, err = suite.storage.Get(ctx, testStatusAttachment.Thumbnail.Path)
+	suite.ErrorIs(err, storage.ErrNotFound)
+	_, err = suite.storage.Get(ctx, testHeader.File.Path)
+	suite.ErrorIs(err, storage.ErrNotFound)
+	_, err = suite.storage.Get(ctx, testHeader.Thumbnail.Path)
 	suite.ErrorIs(err, storage.ErrNotFound)
 
 	// now recache the image....
@@ -82,34 +93,40 @@ func (suite *PruneRemoteTestSuite) TestPruneAndRecache() {
 		}
 		return io.NopCloser(bytes.NewBuffer(b)), int64(len(b)), nil
 	}
-	processingRecache, err := suite.manager.RecacheMedia(ctx, data, nil, testAttachment.ID)
-	suite.NoError(err)
 
-	// synchronously load the recached attachment
-	recachedAttachment, err := processingRecache.LoadAttachment(ctx)
-	suite.NoError(err)
-	suite.NotNil(recachedAttachment)
-
-	// recachedAttachment should be basically the same as the old attachment
-	suite.True(*recachedAttachment.Cached)
-	suite.Equal(testAttachment.ID, recachedAttachment.ID)
-	suite.Equal(testAttachment.File.Path, recachedAttachment.File.Path)           // file should be stored in the same place
-	suite.Equal(testAttachment.Thumbnail.Path, recachedAttachment.Thumbnail.Path) // as should the thumbnail
-	suite.EqualValues(testAttachment.FileMeta, recachedAttachment.FileMeta)       // and the filemeta should be the same
-
-	// recached files should be back in storage
-	_, err = suite.storage.Get(ctx, recachedAttachment.File.Path)
-	suite.NoError(err)
-	_, err = suite.storage.Get(ctx, recachedAttachment.Thumbnail.Path)
-	suite.NoError(err)
+	for _, original := range []*gtsmodel.MediaAttachment{
+		testStatusAttachment,
+		testHeader,
+	} {
+		processingRecache, err := suite.manager.RecacheMedia(ctx, data, nil, original.ID)
+		suite.NoError(err)
+
+		// synchronously load the recached attachment
+		recachedAttachment, err := processingRecache.LoadAttachment(ctx)
+		suite.NoError(err)
+		suite.NotNil(recachedAttachment)
+
+		// recachedAttachment should be basically the same as the old attachment
+		suite.True(*recachedAttachment.Cached)
+		suite.Equal(original.ID, recachedAttachment.ID)
+		suite.Equal(original.File.Path, recachedAttachment.File.Path)           // file should be stored in the same place
+		suite.Equal(original.Thumbnail.Path, recachedAttachment.Thumbnail.Path) // as should the thumbnail
+		suite.EqualValues(original.FileMeta, recachedAttachment.FileMeta)       // and the filemeta should be the same
+
+		// recached files should be back in storage
+		_, err = suite.storage.Get(ctx, recachedAttachment.File.Path)
+		suite.NoError(err)
+		_, err = suite.storage.Get(ctx, recachedAttachment.Thumbnail.Path)
+		suite.NoError(err)
+	}
 }
 
 func (suite *PruneRemoteTestSuite) TestPruneOneNonExistent() {
 	ctx := context.Background()
-	testAttachment := suite.testAttachments["remote_account_1_status_1_attachment_1"]
+	testStatusAttachment := suite.testAttachments["remote_account_1_status_1_attachment_1"]
 
 	// Delete this attachment cached on disk
-	media, err := suite.db.GetAttachmentByID(ctx, testAttachment.ID)
+	media, err := suite.db.GetAttachmentByID(ctx, testStatusAttachment.ID)
 	suite.NoError(err)
 	suite.True(*media.Cached)
 	err = suite.storage.Delete(ctx, media.File.Path)
@@ -118,7 +135,7 @@ func (suite *PruneRemoteTestSuite) TestPruneOneNonExistent() {
 	// Now attempt to prune remote for item with db entry no file
 	totalPruned, err := suite.manager.PruneAllRemote(ctx, 1)
 	suite.NoError(err)
-	suite.Equal(2, totalPruned)
+	suite.Equal(3, totalPruned)
 }
 
 func TestPruneRemoteTestSuite(t *testing.T) {
diff --git a/internal/media/pruneunusedlocal.go b/internal/media/pruneunusedlocal.go
index ba74b7c90..7098648e0 100644
--- a/internal/media/pruneunusedlocal.go
+++ b/internal/media/pruneunusedlocal.go
@@ -20,7 +20,7 @@ package media
 
 import (
 	"context"
-	"fmt"
+	"time"
 
 	"codeberg.org/gruf/go-store/v2/storage"
 	"github.com/superseriousbusiness/gotosocial/internal/db"
@@ -34,10 +34,7 @@ func (m *manager) PruneUnusedLocalAttachments(ctx context.Context) (int, error)
 	var attachments []*gtsmodel.MediaAttachment
 	var err error
 
-	olderThan, err := parseOlderThan(UnusedLocalAttachmentCacheDays)
-	if err != nil {
-		return totalPruned, fmt.Errorf("PruneUnusedLocalAttachments: error parsing olderThanDays %d: %s", UnusedLocalAttachmentCacheDays, err)
-	}
+	olderThan := time.Now().Add(-time.Hour * 24 * time.Duration(UnusedLocalAttachmentCacheDays))
 	log.Infof("PruneUnusedLocalAttachments: pruning unused local attachments older than %s", olderThan)
 
 	// select 20 attachments at a time and prune them
diff --git a/internal/media/util.go b/internal/media/util.go
index 7efd788a1..60661cbc0 100644
--- a/internal/media/util.go
+++ b/internal/media/util.go
@@ -23,7 +23,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"time"
 
 	"github.com/h2non/filetype"
 	"github.com/superseriousbusiness/gotosocial/internal/log"
@@ -134,22 +133,6 @@ func (l *logrusWrapper) Error(err error, msg string, keysAndValues ...interface{
 	log.Error("media manager cron logger: ", err, msg, keysAndValues)
 }
 
-func parseOlderThan(olderThanDays int) (time.Time, error) {
-	// convert days into a duration string
-	olderThanHoursString := fmt.Sprintf("%dh", olderThanDays*24)
-
-	// parse the duration string into a duration
-	olderThanHours, err := time.ParseDuration(olderThanHoursString)
-	if err != nil {
-		return time.Time{}, err
-	}
-
-	// 'subtract' that from the time now to give our threshold
-	olderThan := time.Now().Add(-olderThanHours)
-
-	return olderThan, nil
-}
-
 // lengthReader wraps a reader and reads the length of total bytes written as it goes.
 type lengthReader struct {
 	source io.Reader