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/*
GoToSocial
Copyright (C) 2021-2022 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"
"errors"
"fmt"
"runtime"
"strings"
"time"
"codeberg.org/gruf/go-runners"
"codeberg.org/gruf/go-store/kv"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/id"
"github.com/superseriousbusiness/gotosocial/internal/uris"
)
// Manager provides an interface for managing media: parsing, storing, and retrieving media objects like photos, videos, and gifs.
type Manager interface {
// ProcessMedia begins the process of decoding and storing the given data as a piece of media (aka an attachment).
// It will return a pointer to a Media struct upon which further actions can be performed, such as getting
// the finished media, thumbnail, decoded bytes, attachment, and setting additional fields.
//
// accountID should be the account that the media belongs to.
//
// RemoteURL is optional, and can be an empty string. Setting this to a non-empty string indicates that
// the piece of media originated on a remote instance and has been dereferenced to be cached locally.
ProcessMedia(ctx context.Context, data []byte, accountID string, remoteURL string) (*Media, error)
ProcessEmoji(ctx context.Context, data []byte, accountID string, remoteURL string) (*Media, error)
}
type manager struct {
db db.DB
storage *kv.KVStore
pool runners.WorkerPool
}
// New returns a media manager with the given db and underlying storage.
func New(database db.DB, storage *kv.KVStore) (Manager, error) {
workers := runtime.NumCPU() / 2
queue := workers * 10
pool := runners.NewWorkerPool(workers, queue)
if start := pool.Start(); !start {
return nil, errors.New("could not start worker pool")
}
logrus.Debugf("started media manager worker pool with %d workers and queue capacity of %d", workers, queue)
m := &manager{
db: database,
storage: storage,
pool: pool,
}
return m, nil
}
/*
INTERFACE FUNCTIONS
*/
func (m *manager) ProcessMedia(ctx context.Context, data []byte, accountID string, remoteURL string) (*Media, error) {
contentType, err := parseContentType(data)
if err != nil {
return nil, err
}
split := strings.Split(contentType, "/")
if len(split) != 2 {
return nil, fmt.Errorf("content type %s malformed", contentType)
}
mainType := split[0]
switch mainType {
case mimeImage:
media, err := m.preProcessImage(ctx, data, contentType, accountID, remoteURL)
if err != nil {
return nil, err
}
m.pool.Enqueue(func(innerCtx context.Context) {
select {
case <-innerCtx.Done():
// if the inner context is done that means the worker pool is closing, so we should just return
return
default:
// start preloading the media for the caller's convenience
media.preLoad(innerCtx)
}
})
return media, nil
default:
return nil, fmt.Errorf("content type %s not (yet) supported", contentType)
}
}
func (m *manager) ProcessEmoji(ctx context.Context, data []byte, accountID string, remoteURL string) (*Media, error) {
return nil, nil
}
// preProcessImage initializes processing
func (m *manager) preProcessImage(ctx context.Context, data []byte, contentType string, accountID string, remoteURL string) (*Media, error) {
if !supportedImage(contentType) {
return nil, fmt.Errorf("image type %s not supported", contentType)
}
if len(data) == 0 {
return nil, errors.New("image was of size 0")
}
id, err := id.NewRandomULID()
if err != nil {
return nil, err
}
extension := strings.Split(contentType, "/")[1]
attachment := >smodel.MediaAttachment{
ID: id,
UpdatedAt: time.Now(),
URL: uris.GenerateURIForAttachment(accountID, string(TypeAttachment), string(SizeOriginal), id, extension),
RemoteURL: remoteURL,
Type: gtsmodel.FileTypeImage,
AccountID: accountID,
Processing: 0,
File: gtsmodel.File{
Path: fmt.Sprintf("%s/%s/%s/%s.%s", accountID, TypeAttachment, SizeOriginal, id, extension),
ContentType: contentType,
UpdatedAt: time.Now(),
},
Thumbnail: gtsmodel.Thumbnail{
URL: uris.GenerateURIForAttachment(accountID, string(TypeAttachment), string(SizeSmall), id, mimeJpeg), // all thumbnails are encoded as jpeg,
Path: fmt.Sprintf("%s/%s/%s/%s.%s", accountID, TypeAttachment, SizeSmall, id, mimeJpeg), // all thumbnails are encoded as jpeg,
ContentType: mimeJpeg,
UpdatedAt: time.Now(),
},
Avatar: false,
Header: false,
}
media := &Media{
attachment: attachment,
rawData: data,
thumbstate: received,
fullSizeState: received,
database: m.db,
storage: m.storage,
}
return media, nil
}
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