gotosocial/internal/media/manager.go
2022-01-15 14:33:58 +01:00

176 lines
6.4 KiB
Go

/*
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"
"runtime"
"codeberg.org/gruf/go-runners"
"codeberg.org/gruf/go-store/kv"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/db"
)
// 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 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, attachment, etc.
//
// data should be a function that the media manager can call to return raw bytes of a piece of media.
//
// 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, accountID string, ai *AdditionalMediaInfo) (*ProcessingMedia, error)
ProcessEmoji(ctx context.Context, data DataFunc, shortcode string, id string, uri string, ai *AdditionalEmojiInfo) (*ProcessingEmoji, error)
// NumWorkers returns the total number of workers available to this manager.
NumWorkers() int
// QueueSize returns the total capacity of the queue.
QueueSize() int
// JobsQueued returns the number of jobs currently in the task queue.
JobsQueued() int
// ActiveWorkers returns the number of workers currently performing jobs.
ActiveWorkers() int
// 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
}
type manager struct {
db db.DB
storage *kv.KVStore
pool runners.WorkerPool
numWorkers int
queueSize int
}
// 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 number of workers will be the number of CPUs available to the Go runtime,
// divided by 2 (rounding down, but always at least 1).
//
// The length of the queue will be the number of workers multiplied by 10.
//
// So for an 8 core machine, the media manager will get 4 workers, and a queue of length 40.
// For a 4 core machine, this will be 2 workers, and a queue length of 20.
// For a single or 2-core machine, the media manager will get 1 worker, and a queue of length 10.
func NewManager(database db.DB, storage *kv.KVStore) (Manager, error) {
numWorkers := runtime.NumCPU() / 2
// make sure we always have at least 1 worker even on single-core machines
if numWorkers == 0 {
numWorkers = 1
}
queueSize := numWorkers * 10
m := &manager{
db: database,
storage: storage,
pool: runners.NewWorkerPool(numWorkers, queueSize),
numWorkers: numWorkers,
queueSize: queueSize,
}
if start := m.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", numWorkers, queueSize)
return m, nil
}
func (m *manager) ProcessMedia(ctx context.Context, data DataFunc, accountID string, ai *AdditionalMediaInfo) (*ProcessingMedia, error) {
processingMedia, err := m.preProcessMedia(ctx, data, accountID, ai)
if err != nil {
return nil, err
}
logrus.Tracef("ProcessMedia: about to enqueue media with attachmentID %s, queue length is %d", processingMedia.AttachmentID(), m.pool.Queue())
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 loading the media already for the caller's convenience
if _, err := processingMedia.LoadAttachment(innerCtx); err != nil {
logrus.Errorf("ProcessMedia: error processing media with attachmentID %s: %s", processingMedia.AttachmentID(), err)
}
}
})
logrus.Tracef("ProcessMedia: succesfully queued media with attachmentID %s, queue length is %d", processingMedia.AttachmentID(), m.pool.Queue())
return processingMedia, nil
}
func (m *manager) ProcessEmoji(ctx context.Context, data DataFunc, shortcode string, id string, uri string, ai *AdditionalEmojiInfo) (*ProcessingEmoji, error) {
processingEmoji, err := m.preProcessEmoji(ctx, data, shortcode, id, uri, ai)
if err != nil {
return nil, err
}
logrus.Tracef("ProcessEmoji: about to enqueue emoji with id %s, queue length is %d", processingEmoji.EmojiID(), m.pool.Queue())
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 loading the emoji already for the caller's convenience
if _, err := processingEmoji.LoadEmoji(innerCtx); err != nil {
logrus.Errorf("ProcessEmoji: error processing emoji with id %s: %s", processingEmoji.EmojiID(), err)
}
}
})
logrus.Tracef("ProcessEmoji: succesfully queued emoji with id %s, queue length is %d", processingEmoji.EmojiID(), m.pool.Queue())
return processingEmoji, nil
}
func (m *manager) NumWorkers() int {
return m.numWorkers
}
func (m *manager) QueueSize() int {
return m.queueSize
}
func (m *manager) JobsQueued() int {
return m.pool.Queue()
}
func (m *manager) ActiveWorkers() int {
return m.pool.Workers()
}
func (m *manager) Stop() error {
logrus.Info("stopping media manager worker pool")
stopped := m.pool.Stop()
if !stopped {
return errors.New("could not stop media manager worker pool")
}
return nil
}