mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-22 19:56:39 +00:00
291 lines
9.6 KiB
Go
291 lines
9.6 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package media
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import (
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"bytes"
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"context"
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"fmt"
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"io"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"codeberg.org/gruf/go-store/kv"
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"github.com/superseriousbusiness/gotosocial/internal/db"
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"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
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"github.com/superseriousbusiness/gotosocial/internal/uris"
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)
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// ProcessingEmoji represents an emoji currently processing. It exposes
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// various functions for retrieving data from the process.
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type ProcessingEmoji struct {
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mu sync.Mutex
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// id of this instance's account -- pinned for convenience here so we only need to fetch it once
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instanceAccountID string
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/*
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below fields should be set on newly created media;
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emoji will be updated incrementally as media goes through processing
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*/
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emoji *gtsmodel.Emoji
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data DataFunc
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read bool // bool indicating that data function has been triggered already
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/*
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below fields represent the processing state of the static of the emoji
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*/
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staticState int32
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/*
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below pointers to database and storage are maintained so that
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the media can store and update itself during processing steps
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*/
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database db.DB
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storage *kv.KVStore
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err error // error created during processing, if any
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// track whether this emoji has already been put in the databse
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insertedInDB bool
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}
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// EmojiID returns the ID of the underlying emoji without blocking processing.
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func (p *ProcessingEmoji) EmojiID() string {
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return p.emoji.ID
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}
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// LoadEmoji blocks until the static and fullsize image
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// has been processed, and then returns the completed emoji.
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func (p *ProcessingEmoji) LoadEmoji(ctx context.Context) (*gtsmodel.Emoji, error) {
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p.mu.Lock()
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defer p.mu.Unlock()
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if err := p.store(ctx); err != nil {
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return nil, err
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}
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if err := p.loadStatic(ctx); err != nil {
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return nil, err
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}
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// store the result in the database before returning it
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if !p.insertedInDB {
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if err := p.database.Put(ctx, p.emoji); err != nil {
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return nil, err
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}
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p.insertedInDB = true
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}
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return p.emoji, nil
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}
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// Finished returns true if processing has finished for both the thumbnail
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// and full fized version of this piece of media.
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func (p *ProcessingEmoji) Finished() bool {
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return atomic.LoadInt32(&p.staticState) == int32(complete)
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}
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func (p *ProcessingEmoji) loadStatic(ctx context.Context) error {
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staticState := atomic.LoadInt32(&p.staticState)
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switch processState(staticState) {
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case received:
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// stream the original file out of storage...
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stored, err := p.storage.GetStream(p.emoji.ImagePath)
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if err != nil {
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p.err = fmt.Errorf("loadStatic: error fetching file from storage: %s", err)
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atomic.StoreInt32(&p.staticState, int32(errored))
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return p.err
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}
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// we haven't processed a static version of this emoji yet so do it now
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static, err := deriveStaticEmoji(stored, p.emoji.ImageContentType)
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if err != nil {
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p.err = fmt.Errorf("loadStatic: error deriving static: %s", err)
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atomic.StoreInt32(&p.staticState, int32(errored))
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return p.err
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}
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if err := stored.Close(); err != nil {
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p.err = fmt.Errorf("loadStatic: error closing stored full size: %s", err)
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atomic.StoreInt32(&p.staticState, int32(errored))
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return p.err
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}
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// put the static in storage
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if err := p.storage.Put(p.emoji.ImageStaticPath, static.small); err != nil {
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p.err = fmt.Errorf("loadStatic: error storing static: %s", err)
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atomic.StoreInt32(&p.staticState, int32(errored))
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return p.err
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}
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p.emoji.ImageStaticFileSize = len(static.small)
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// we're done processing the static version of the emoji!
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atomic.StoreInt32(&p.staticState, int32(complete))
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fallthrough
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case complete:
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return nil
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case errored:
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return p.err
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}
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return fmt.Errorf("static processing status %d unknown", p.staticState)
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}
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// store calls the data function attached to p if it hasn't been called yet,
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// and updates the underlying attachment fields as necessary. It will then stream
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// bytes from p's reader directly into storage so that it can be retrieved later.
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func (p *ProcessingEmoji) store(ctx context.Context) error {
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// check if we've already done this and bail early if we have
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if p.read {
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return nil
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}
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// execute the data function to get the reader out of it
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reader, fileSize, err := p.data(ctx)
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if err != nil {
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return fmt.Errorf("store: error executing data function: %s", err)
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}
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// extract no more than 261 bytes from the beginning of the file -- this is the header
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firstBytes := make([]byte, maxFileHeaderBytes)
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if _, err := reader.Read(firstBytes); err != nil {
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return fmt.Errorf("store: error reading initial %d bytes: %s", maxFileHeaderBytes, err)
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}
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// now we have the file header we can work out the content type from it
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contentType, err := parseContentType(firstBytes)
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if err != nil {
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return fmt.Errorf("store: error parsing content type: %s", err)
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}
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// bail if this is a type we can't process
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if !supportedEmoji(contentType) {
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return fmt.Errorf("store: content type %s was not valid for an emoji", contentType)
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}
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// extract the file extension
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split := strings.Split(contentType, "/")
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extension := split[1] // something like 'gif'
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// set some additional fields on the emoji now that
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// we know more about what the underlying image actually is
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p.emoji.ImageURL = uris.GenerateURIForAttachment(p.instanceAccountID, string(TypeEmoji), string(SizeOriginal), p.emoji.ID, extension)
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p.emoji.ImagePath = fmt.Sprintf("%s/%s/%s/%s.%s", p.instanceAccountID, TypeEmoji, SizeOriginal, p.emoji.ID, extension)
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p.emoji.ImageContentType = contentType
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p.emoji.ImageFileSize = fileSize
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// concatenate the first bytes with the existing bytes still in the reader (thanks Mara)
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multiReader := io.MultiReader(bytes.NewBuffer(firstBytes), reader)
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// store this for now -- other processes can pull it out of storage as they please
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if err := p.storage.PutStream(p.emoji.ImagePath, multiReader); err != nil {
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return fmt.Errorf("store: error storing stream: %s", err)
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}
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// if the original reader is a readcloser, close it since we're done with it now
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if rc, ok := reader.(io.ReadCloser); ok {
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if err := rc.Close(); err != nil {
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return fmt.Errorf("store: error closing readcloser: %s", err)
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}
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}
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p.read = true
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return nil
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}
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func (m *manager) preProcessEmoji(ctx context.Context, data DataFunc, shortcode string, id string, uri string, ai *AdditionalEmojiInfo) (*ProcessingEmoji, error) {
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instanceAccount, err := m.db.GetInstanceAccount(ctx, "")
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if err != nil {
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return nil, fmt.Errorf("preProcessEmoji: error fetching this instance account from the db: %s", err)
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}
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// populate initial fields on the emoji -- some of these will be overwritten as we proceed
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emoji := >smodel.Emoji{
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ID: id,
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CreatedAt: time.Now(),
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UpdatedAt: time.Now(),
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Shortcode: shortcode,
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Domain: "", // assume our own domain unless told otherwise
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ImageRemoteURL: "",
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ImageStaticRemoteURL: "",
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ImageURL: "", // we don't know yet
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ImageStaticURL: uris.GenerateURIForAttachment(instanceAccount.ID, string(TypeEmoji), string(SizeStatic), id, mimePng), // all static emojis are encoded as png
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ImagePath: "", // we don't know yet
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ImageStaticPath: fmt.Sprintf("%s/%s/%s/%s.%s", instanceAccount.ID, TypeEmoji, SizeStatic, id, mimePng), // all static emojis are encoded as png
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ImageContentType: "", // we don't know yet
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ImageStaticContentType: mimeImagePng, // all static emojis are encoded as png
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ImageFileSize: 0,
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ImageStaticFileSize: 0,
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ImageUpdatedAt: time.Now(),
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Disabled: false,
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URI: uri,
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VisibleInPicker: true,
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CategoryID: "",
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}
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// check if we have additional info to add to the emoji,
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// and overwrite some of the emoji fields if so
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if ai != nil {
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if ai.CreatedAt != nil {
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emoji.CreatedAt = *ai.CreatedAt
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}
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if ai.Domain != nil {
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emoji.Domain = *ai.Domain
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}
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if ai.ImageRemoteURL != nil {
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emoji.ImageRemoteURL = *ai.ImageRemoteURL
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}
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if ai.ImageStaticRemoteURL != nil {
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emoji.ImageStaticRemoteURL = *ai.ImageStaticRemoteURL
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}
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if ai.Disabled != nil {
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emoji.Disabled = *ai.Disabled
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}
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if ai.VisibleInPicker != nil {
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emoji.VisibleInPicker = *ai.VisibleInPicker
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}
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if ai.CategoryID != nil {
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emoji.CategoryID = *ai.CategoryID
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}
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}
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processingEmoji := &ProcessingEmoji{
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instanceAccountID: instanceAccount.ID,
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emoji: emoji,
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data: data,
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staticState: int32(received),
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database: m.db,
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storage: m.storage,
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}
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return processingEmoji, nil
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}
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