gotosocial/internal/media/manager.go

298 lines
11 KiB
Go

/*
GoToSocial
Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
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"
"fmt"
"time"
"github.com/robfig/cron/v3"
"github.com/superseriousbusiness/gotosocial/internal/concurrency"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/log"
"github.com/superseriousbusiness/gotosocial/internal/storage"
)
// selectPruneLimit is the amount of media entries to select at a time from the db when pruning
const selectPruneLimit = 20
// UnusedLocalAttachmentCacheDays is the amount of days to keep local media in storage if it
// is not attached to a status, or was never attached to a status.
const UnusedLocalAttachmentCacheDays = 3
// Manager provides an interface for managing media: parsing, storing, and retrieving media objects like photos, videos, and gifs.
type Manager interface {
// Stop stops the underlying worker pool of the manager. It should be called
// when closing GoToSocial in order to cleanly finish any in-progress jobs.
// It will block until workers are finished processing.
Stop() error
/*
PROCESSING FUNCTIONS
*/
// ProcessMedia begins the process of decoding and storing the given data as an attachment.
// It will return a pointer to a ProcessingMedia struct upon which further actions can be performed, such as getting
// the finished media, thumbnail, attachment, etc.
//
// data should be a function that the media manager can call to return a reader containing the media data.
//
// postData will be called after data has been called; it can be used to clean up any remaining resources.
// The provided function can be nil, in which case it will not be executed.
//
// accountID should be the account that the media belongs to.
//
// ai is optional and can be nil. Any additional information about the attachment provided will be put in the database.
ProcessMedia(ctx context.Context, data DataFunc, postData PostDataCallbackFunc, accountID string, ai *AdditionalMediaInfo) (*ProcessingMedia, error)
// ProcessEmoji begins the process of decoding and storing the given data as an emoji.
// It will return a pointer to a ProcessingEmoji struct upon which further actions can be performed, such as getting
// the finished media, thumbnail, attachment, etc.
//
// data should be a function that the media manager can call to return a reader containing the emoji data.
//
// postData will be called after data has been called; it can be used to clean up any remaining resources.
// The provided function can be nil, in which case it will not be executed.
//
// shortcode should be the emoji shortcode without the ':'s around it.
//
// id is the database ID that should be used to store the emoji.
//
// uri is the ActivityPub URI/ID of the emoji.
//
// ai is optional and can be nil. Any additional information about the emoji provided will be put in the database.
//
// If refresh is true, this indicates that the emoji image has changed and should be updated.
ProcessEmoji(ctx context.Context, data DataFunc, postData PostDataCallbackFunc, shortcode string, id string, uri string, ai *AdditionalEmojiInfo, refresh bool) (*ProcessingEmoji, error)
// RecacheMedia refetches, reprocesses, and recaches an existing attachment that has been uncached via pruneRemote.
RecacheMedia(ctx context.Context, data DataFunc, postData PostDataCallbackFunc, attachmentID string) (*ProcessingMedia, error)
/*
PRUNING FUNCTIONS
*/
// PruneAllRemote prunes all remote media attachments cached on this instance which are older than the given amount of days.
// 'Pruning' in this context means removing the locally stored data of the attachment (both thumbnail and full size),
// and setting 'cached' to false on the associated attachment.
//
// The returned int is the amount of media that was pruned by this function.
PruneAllRemote(ctx context.Context, olderThanDays int) (int, error)
// PruneAllMeta 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.
PruneAllMeta(ctx context.Context) (int, error)
// PruneUnusedLocalAttachments 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.
PruneUnusedLocalAttachments(ctx context.Context) (int, error)
// 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.
PruneOrphaned(ctx context.Context, dry bool) (int, error)
/*
REFETCHING FUNCTIONS
Useful when data loss has occurred.
*/
// RefetchEmojis iterates through remote emojis (for the given domain, or all if domain is empty string).
//
// For each emoji, the manager will check whether both the full size and static images are present in storage.
// If not, the manager will refetch and reprocess full size and static images for the emoji.
//
// The provided DereferenceMedia function will be used when it's necessary to refetch something this way.
RefetchEmojis(ctx context.Context, domain string, dereferenceMedia DereferenceMedia) (int, error)
}
type manager struct {
db db.DB
storage *storage.Driver
emojiWorker *concurrency.WorkerPool[*ProcessingEmoji]
mediaWorker *concurrency.WorkerPool[*ProcessingMedia]
stopCronJobs func() error
}
// NewManager returns a media manager with the given db and underlying storage.
//
// A worker pool will also be initialized for the manager, to ensure that only
// a limited number of media will be processed in parallel. The numbers of workers
// is determined from the $GOMAXPROCS environment variable (usually no. CPU cores).
// See internal/concurrency.NewWorkerPool() documentation for further information.
func NewManager(database db.DB, storage *storage.Driver) (Manager, error) {
m := &manager{
db: database,
storage: storage,
}
// Prepare the media worker pool
m.mediaWorker = concurrency.NewWorkerPool[*ProcessingMedia](-1, 10)
m.mediaWorker.SetProcessor(func(ctx context.Context, media *ProcessingMedia) error {
if err := ctx.Err(); err != nil {
return err
}
if _, err := media.LoadAttachment(ctx); err != nil {
return fmt.Errorf("error loading media %s: %v", media.AttachmentID(), err)
}
return nil
})
// Prepare the emoji worker pool
m.emojiWorker = concurrency.NewWorkerPool[*ProcessingEmoji](-1, 10)
m.emojiWorker.SetProcessor(func(ctx context.Context, emoji *ProcessingEmoji) error {
if err := ctx.Err(); err != nil {
return err
}
if _, err := emoji.LoadEmoji(ctx); err != nil {
return fmt.Errorf("error loading emoji %s: %v", emoji.EmojiID(), err)
}
return nil
})
// Start the worker pools
if err := m.mediaWorker.Start(); err != nil {
return nil, err
}
if err := m.emojiWorker.Start(); err != nil {
return nil, err
}
if err := scheduleCleanupJobs(m); err != nil {
return nil, err
}
return m, nil
}
func (m *manager) ProcessMedia(ctx context.Context, data DataFunc, postData PostDataCallbackFunc, accountID string, ai *AdditionalMediaInfo) (*ProcessingMedia, error) {
processingMedia, err := m.preProcessMedia(ctx, data, postData, accountID, ai)
if err != nil {
return nil, err
}
m.mediaWorker.Queue(processingMedia)
return processingMedia, nil
}
func (m *manager) ProcessEmoji(ctx context.Context, data DataFunc, postData PostDataCallbackFunc, shortcode string, id string, uri string, ai *AdditionalEmojiInfo, refresh bool) (*ProcessingEmoji, error) {
processingEmoji, err := m.preProcessEmoji(ctx, data, postData, shortcode, id, uri, ai, refresh)
if err != nil {
return nil, err
}
m.emojiWorker.Queue(processingEmoji)
return processingEmoji, nil
}
func (m *manager) RecacheMedia(ctx context.Context, data DataFunc, postData PostDataCallbackFunc, attachmentID string) (*ProcessingMedia, error) {
processingRecache, err := m.preProcessRecache(ctx, data, postData, attachmentID)
if err != nil {
return nil, err
}
m.mediaWorker.Queue(processingRecache)
return processingRecache, nil
}
func (m *manager) Stop() error {
// Stop media and emoji worker pools
mediaErr := m.mediaWorker.Stop()
emojiErr := m.emojiWorker.Stop()
var cronErr error
if m.stopCronJobs != nil {
cronErr = m.stopCronJobs()
}
if mediaErr != nil {
return mediaErr
} else if emojiErr != nil {
return emojiErr
}
return cronErr
}
func scheduleCleanupJobs(m *manager) error {
// create a new cron instance for scheduling cleanup jobs
c := cron.New(cron.WithLogger(&logrusWrapper{}))
pruneCtx, pruneCancel := context.WithCancel(context.Background())
if _, err := c.AddFunc("@midnight", func() {
begin := time.Now()
pruned, err := m.PruneAllMeta(pruneCtx)
if err != nil {
log.Errorf("media manager: error pruning meta: %s", err)
return
}
log.Infof("media manager: pruned %d meta entries in %s", pruned, time.Since(begin))
}); err != nil {
pruneCancel()
return fmt.Errorf("error starting media manager meta cleanup job: %s", err)
}
if _, err := c.AddFunc("@midnight", func() {
begin := time.Now()
pruned, err := m.PruneUnusedLocalAttachments(pruneCtx)
if err != nil {
log.Errorf("media manager: error pruning unused local attachments: %s", err)
return
}
log.Infof("media manager: pruned %d unused local attachments in %s", pruned, time.Since(begin))
}); err != nil {
pruneCancel()
return fmt.Errorf("error starting media manager unused local attachments cleanup job: %s", err)
}
// start remote cache cleanup cronjob if configured
if mediaRemoteCacheDays := config.GetMediaRemoteCacheDays(); mediaRemoteCacheDays > 0 {
if _, err := c.AddFunc("@midnight", func() {
begin := time.Now()
pruned, err := m.PruneAllRemote(pruneCtx, mediaRemoteCacheDays)
if err != nil {
log.Errorf("media manager: error pruning remote cache: %s", err)
return
}
log.Infof("media manager: pruned %d remote cache entries in %s", pruned, time.Since(begin))
}); err != nil {
pruneCancel()
return fmt.Errorf("error starting media manager remote cache cleanup job: %s", err)
}
}
// try to stop any jobs gracefully by waiting til they're finished
m.stopCronJobs = func() error {
cronCtx := c.Stop()
select {
case <-cronCtx.Done():
log.Infof("media manager: cron finished jobs and stopped gracefully")
case <-time.After(1 * time.Minute):
log.Infof("media manager: cron didn't stop after 60 seconds, will force close jobs")
break
}
pruneCancel()
return nil
}
c.Start()
return nil
}