gotosocial/internal/media/prune.go

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// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package media
import (
"context"
"errors"
"fmt"
"time"
"codeberg.org/gruf/go-store/v2/storage"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/log"
"github.com/superseriousbusiness/gotosocial/internal/regexes"
"github.com/superseriousbusiness/gotosocial/internal/uris"
)
const (
selectPruneLimit = 50 // Amount of media entries to select at a time from the db when pruning.
unusedLocalAttachmentDays = 3 // Number of days to keep local media in storage if not attached to a status.
)
// PruneAll runs all of the below pruning/uncacheing functions, and then cleans up any resulting
// empty directories from the storage driver. It can be called as a shortcut for calling the below
// pruning functions one by one.
//
// If blocking is true, then any errors encountered during the prune will be combined + returned to
// the caller. If blocking is false, the prune is run in the background and errors are just logged
// instead.
func (m *Manager) PruneAll(ctx context.Context, mediaCacheRemoteDays int, blocking bool) error {
const dry = false
f := func(innerCtx context.Context) error {
errs := gtserror.MultiError{}
pruned, err := m.PruneUnusedLocal(innerCtx, dry)
if err != nil {
errs = append(errs, fmt.Sprintf("error pruning unused local media (%s)", err))
} else {
log.Infof(ctx, "pruned %d unused local media", pruned)
}
pruned, err = m.PruneUnusedRemote(innerCtx, dry)
if err != nil {
errs = append(errs, fmt.Sprintf("error pruning unused remote media: (%s)", err))
} else {
log.Infof(ctx, "pruned %d unused remote media", pruned)
}
pruned, err = m.UncacheRemote(innerCtx, mediaCacheRemoteDays, dry)
if err != nil {
errs = append(errs, fmt.Sprintf("error uncacheing remote media older than %d day(s): (%s)", mediaCacheRemoteDays, err))
} else {
log.Infof(ctx, "uncached %d remote media older than %d day(s)", pruned, mediaCacheRemoteDays)
}
pruned, err = m.PruneOrphaned(innerCtx, dry)
if err != nil {
errs = append(errs, fmt.Sprintf("error pruning orphaned media: (%s)", err))
} else {
log.Infof(ctx, "pruned %d orphaned media", pruned)
}
if err := m.state.Storage.Storage.Clean(innerCtx); err != nil {
errs = append(errs, fmt.Sprintf("error cleaning storage: (%s)", err))
} else {
log.Info(ctx, "cleaned storage")
}
return errs.Combine()
}
if blocking {
return f(ctx)
}
go func() {
if err := f(context.Background()); err != nil {
log.Error(ctx, err)
}
}()
return nil
}
// PruneUnusedRemote prunes unused/out of date headers and avatars cached on this instance.
//
// The returned int is the amount of media that was pruned by this function.
func (m *Manager) PruneUnusedRemote(ctx context.Context, dry bool) (int, error) {
var (
totalPruned int
maxID string
attachments []*gtsmodel.MediaAttachment
err error
)
// We don't know in advance how many remote attachments will meet
// our criteria for being 'unused'. So a dry run in this case just
// means we iterate through as normal, but do nothing with each entry
// instead of removing it. Define this here so we don't do the 'if dry'
// check inside the loop a million times.
var f func(ctx context.Context, attachment *gtsmodel.MediaAttachment) error
if !dry {
f = m.deleteAttachment
} else {
f = func(_ context.Context, _ *gtsmodel.MediaAttachment) error {
return nil // noop
}
}
for attachments, err = m.state.DB.GetAvatarsAndHeaders(ctx, maxID, selectPruneLimit); err == nil && len(attachments) != 0; attachments, err = m.state.DB.GetAvatarsAndHeaders(ctx, maxID, selectPruneLimit) {
maxID = attachments[len(attachments)-1].ID // use the id of the last attachment in the slice as the next 'maxID' value
for _, attachment := range attachments {
// Retrieve owning account if possible.
var account *gtsmodel.Account
if accountID := attachment.AccountID; accountID != "" {
account, err = m.state.DB.GetAccountByID(ctx, attachment.AccountID)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
// Only return on a real error.
return 0, fmt.Errorf("PruneUnusedRemote: error fetching account with id %s: %w", accountID, err)
}
}
// Prune each attachment that meets one of the following criteria:
// - Has no owning account in the database.
// - Is a header but isn't the owning account's current header.
// - Is an avatar but isn't the owning account's current avatar.
if account == nil ||
(*attachment.Header && attachment.ID != account.HeaderMediaAttachmentID) ||
(*attachment.Avatar && attachment.ID != account.AvatarMediaAttachmentID) {
if err := f(ctx, attachment); err != nil {
return totalPruned, err
}
totalPruned++
}
}
}
// Make sure we don't have a real error when we leave the loop.
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return totalPruned, err
}
return totalPruned, nil
}
// PruneOrphaned prunes files that exist in storage but which do not have a corresponding
// entry in the database.
//
// If dry is true, then nothing will be changed, only the amount that *would* be removed
// is returned to the caller.
func (m *Manager) PruneOrphaned(ctx context.Context, dry bool) (int, error) {
// Emojis are stored under the instance account, so we
// need the ID of the instance account for the next part.
instanceAccount, err := m.state.DB.GetInstanceAccount(ctx, "")
if err != nil {
return 0, fmt.Errorf("PruneOrphaned: error getting instance account: %w", err)
}
instanceAccountID := instanceAccount.ID
var orphanedKeys []string
// Keys in storage will look like the following format:
// `[ACCOUNT_ID]/[MEDIA_TYPE]/[MEDIA_SIZE]/[MEDIA_ID].[EXTENSION]`
// We can filter out keys we're not interested in by matching through a regex.
if err := m.state.Storage.WalkKeys(ctx, func(ctx context.Context, key string) error {
if !regexes.FilePath.MatchString(key) {
// This is not our expected key format.
return nil
}
// Check whether this storage entry is orphaned.
orphaned, err := m.orphaned(ctx, key, instanceAccountID)
if err != nil {
return fmt.Errorf("error checking orphaned status: %w", err)
}
if orphaned {
// Add this orphaned entry to list of keys.
orphanedKeys = append(orphanedKeys, key)
}
return nil
}); err != nil {
return 0, fmt.Errorf("PruneOrphaned: error walking keys: %w", err)
}
totalPruned := len(orphanedKeys)
if dry {
// Dry run: don't remove anything.
return totalPruned, nil
}
// This is not a drill! We have to delete stuff!
return m.removeFiles(ctx, orphanedKeys...)
}
func (m *Manager) orphaned(ctx context.Context, key string, instanceAccountID string) (bool, error) {
pathParts := regexes.FilePath.FindStringSubmatch(key)
if len(pathParts) != 6 {
// This doesn't match our expectations so
// it wasn't created by gts; ignore it.
return false, nil
}
var (
mediaType = pathParts[2]
mediaID = pathParts[4]
orphaned = false
)
// Look for keys in storage that we don't have an attachment for.
switch Type(mediaType) {
case TypeAttachment, TypeHeader, TypeAvatar:
if _, err := m.state.DB.GetAttachmentByID(ctx, mediaID); err != nil {
if !errors.Is(err, db.ErrNoEntries) {
return false, fmt.Errorf("error calling GetAttachmentByID: %w", err)
}
orphaned = true
}
case TypeEmoji:
// Look using the static URL for the emoji. Emoji images can change, so
// the MEDIA_ID part of the key for emojis will not necessarily correspond
// to the file that's currently being used as the emoji image.
staticURL := uris.GenerateURIForAttachment(instanceAccountID, string(TypeEmoji), string(SizeStatic), mediaID, mimePng)
if _, err := m.state.DB.GetEmojiByStaticURL(ctx, staticURL); err != nil {
if !errors.Is(err, db.ErrNoEntries) {
return false, fmt.Errorf("error calling GetEmojiByStaticURL: %w", err)
}
orphaned = true
}
}
return orphaned, nil
}
// UncacheRemote uncaches all remote media attachments older than the given amount of days.
//
// In this context, uncacheing means deleting media files from storage and marking the attachment
// as cached=false in the database.
//
// If 'dry' is true, then only a dry run will be performed: nothing will actually be changed.
//
// The returned int is the amount of media that was/would be uncached by this function.
func (m *Manager) UncacheRemote(ctx context.Context, olderThanDays int, dry bool) (int, error) {
if olderThanDays < 0 {
return 0, nil
}
olderThan := time.Now().Add(-time.Hour * 24 * time.Duration(olderThanDays))
if dry {
// Dry run, just count eligible entries without removing them.
return m.state.DB.CountRemoteOlderThan(ctx, olderThan)
}
var (
totalPruned int
attachments []*gtsmodel.MediaAttachment
err error
)
for attachments, err = m.state.DB.GetRemoteOlderThan(ctx, olderThan, selectPruneLimit); err == nil && len(attachments) != 0; attachments, err = m.state.DB.GetRemoteOlderThan(ctx, olderThan, selectPruneLimit) {
olderThan = attachments[len(attachments)-1].CreatedAt // use the created time of the last attachment in the slice as the next 'olderThan' value
for _, attachment := range attachments {
if err := m.uncacheAttachment(ctx, attachment); err != nil {
return totalPruned, err
}
totalPruned++
}
}
// Make sure we don't have a real error when we leave the loop.
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return totalPruned, err
}
return totalPruned, nil
}
// PruneUnusedLocal prunes unused media attachments that were uploaded by
// a user on this instance, but never actually attached to a status, or attached but
// later detached.
//
// The returned int is the amount of media that was pruned by this function.
func (m *Manager) PruneUnusedLocal(ctx context.Context, dry bool) (int, error) {
olderThan := time.Now().Add(-time.Hour * 24 * time.Duration(unusedLocalAttachmentDays))
if dry {
// Dry run, just count eligible entries without removing them.
return m.state.DB.CountLocalUnattachedOlderThan(ctx, olderThan)
}
var (
totalPruned int
attachments []*gtsmodel.MediaAttachment
err error
)
for attachments, err = m.state.DB.GetLocalUnattachedOlderThan(ctx, olderThan, selectPruneLimit); err == nil && len(attachments) != 0; attachments, err = m.state.DB.GetLocalUnattachedOlderThan(ctx, olderThan, selectPruneLimit) {
olderThan = attachments[len(attachments)-1].CreatedAt // use the created time of the last attachment in the slice as the next 'olderThan' value
for _, attachment := range attachments {
if err := m.deleteAttachment(ctx, attachment); err != nil {
return totalPruned, err
}
totalPruned++
}
}
// Make sure we don't have a real error when we leave the loop.
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return totalPruned, err
}
return totalPruned, nil
}
/*
Handy little helpers
*/
func (m *Manager) deleteAttachment(ctx context.Context, attachment *gtsmodel.MediaAttachment) error {
if _, err := m.removeFiles(ctx, attachment.File.Path, attachment.Thumbnail.Path); err != nil {
return err
}
// Delete attachment completely.
return m.state.DB.DeleteAttachment(ctx, attachment.ID)
}
func (m *Manager) uncacheAttachment(ctx context.Context, attachment *gtsmodel.MediaAttachment) error {
if _, err := m.removeFiles(ctx, attachment.File.Path, attachment.Thumbnail.Path); err != nil {
return err
}
// Update attachment to reflect that we no longer have it cached.
attachment.Cached = func() *bool { i := false; return &i }()
return m.state.DB.UpdateAttachment(ctx, attachment, "cached")
}
func (m *Manager) removeFiles(ctx context.Context, keys ...string) (int, error) {
errs := make(gtserror.MultiError, 0, len(keys))
for _, key := range keys {
if err := m.state.Storage.Delete(ctx, key); err != nil && !errors.Is(err, storage.ErrNotFound) {
errs = append(errs, "storage error removing "+key+": "+err.Error())
}
}
return len(keys) - len(errs), errs.Combine()
}