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[chore] small changes missed in previous dereferencer.GetAccount() PRs (#1467)

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* small formatting changes, rewrite fetchRemoteMedia to use separate funcs + use mutex lock correctly

* move url parsing before acquiring mutex locks

* use wrapped mutexes to allow safe unlocking. (previously i did a fucky and passed mutex by value...)

* remove unused code

* use consistent map keying for dereferencing headers/avatars

---------

Signed-off-by: kim <grufwub@gmail.com>
This commit is contained in:
kim 2023-02-10 20:15:23 +00:00 • committed by GitHub
commit 6ac1dda96f
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4 changed files with 152 additions and 124 deletions
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165
internal/federation/dereferencing/account.go
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@ -146,6 +146,7 @@ func (d *deref) enrichAccount(ctx context.Context, requestUser string, uri *url.
}
}
// Pre-fetch a transport for requesting username, used by later deref procedures.
transport, err := d.transportController.NewTransportForUsername(ctx, requestUser)
if err != nil {
return nil, fmt.Errorf("enrichAccount: couldn't create transport: %w", err)
@ -163,19 +164,14 @@ func (d *deref) enrichAccount(ctx context.Context, requestUser string, uri *url.
if err == nil {
if account.Domain != accDomain {
// We have the correct accountDomain now; if it was different from
// the account domain we were provided, do another db lookup to check
// if we already had the account in the db under the account domain we
// just discovered, otherwise we risk thinking this is a new account
// and trying to put it into the database again (which will cause issues).
// After webfinger, we now have correct account domain from which we can do a final DB check.
alreadyAccount, err := d.db.GetAccountByUsernameDomain(ctx, account.Username, accDomain)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return nil, fmt.Errorf("enrichAccount: db err looking for account again after webfinger: %w", err)
}
if err == nil {
// We already had the account in the database;
// continue by enriching that one instead.
// Enrich existing account.
account = alreadyAccount
}
}
@ -197,14 +193,14 @@ func (d *deref) enrichAccount(ctx context.Context, requestUser string, uri *url.
}
}
// Check whether this account URI is a blocked domain / subdomain
// Check whether this account URI is a blocked domain / subdomain.
if blocked, err := d.db.IsDomainBlocked(ctx, uri.Host); err != nil {
return nil, newErrDB(fmt.Errorf("enrichAccount: error checking blocked domain: %w", err))
} else if blocked {
return nil, fmt.Errorf("enrichAccount: %s is blocked", uri.Host)
}
// Mark deref+update handshake start
// Mark deref+update handshake start.
d.startHandshake(requestUser, uri)
defer d.stopHandshake(requestUser, uri)
@ -225,7 +221,7 @@ func (d *deref) enrichAccount(ctx context.Context, requestUser string, uri *url.
if account.Username == "" {
// No username was provided, so no webfinger was attempted earlier.
//
// Now we have a username we can attempt it now, this ensures up-to-date accountdomain info.
// Now we have a username we can attempt it, this ensures up-to-date accountdomain info.
accDomain, _, err := d.fingerRemoteAccount(ctx, transport, latestAcc.Username, uri.Host)
if err == nil {
@ -238,32 +234,32 @@ func (d *deref) enrichAccount(ctx context.Context, requestUser string, uri *url.
latestAcc.ID = account.ID
latestAcc.FetchedAt = time.Now()
// Fetch latest account avatar only if remote URI has changed
if latestAcc.AvatarRemoteURL != "" && latestAcc.AvatarRemoteURL != account.AvatarRemoteURL {
d.dereferencingAvatarsLock.Lock()
newAvatarID, err := d.fetchRemoteAccountMedia(ctx, transport, latestAcc.AvatarRemoteURL, latestAcc.ID, d.dereferencingAvatars, true, false)
d.dereferencingAvatarsLock.Unlock()
// Use the existing account media attachments by default.
latestAcc.AvatarMediaAttachmentID = account.AvatarMediaAttachmentID
latestAcc.HeaderMediaAttachmentID = account.HeaderMediaAttachmentID
if latestAcc.AvatarRemoteURL != account.AvatarRemoteURL && latestAcc.AvatarRemoteURL != "" {
// Account avatar URL has changed; fetch up-to-date copy and use new media ID.
latestAcc.AvatarMediaAttachmentID, err = d.fetchRemoteAccountAvatar(ctx,
transport,
latestAcc.AvatarRemoteURL,
latestAcc.ID,
)
if err != nil {
log.Errorf("error fetching remote avatar for account %s: %v", uri, err)
} else {
latestAcc.AvatarMediaAttachmentID = newAvatarID
}
} else {
latestAcc.AvatarMediaAttachmentID = account.AvatarMediaAttachmentID // no change / empty url
}
// Fetch latest account header only if remote URI has changed
if latestAcc.AvatarRemoteURL != "" && latestAcc.AvatarRemoteURL != account.AvatarRemoteURL {
d.dereferencingHeadersLock.Lock()
newHeaderID, err := d.fetchRemoteAccountMedia(ctx, transport, latestAcc.HeaderRemoteURL, latestAcc.ID, d.dereferencingHeaders, false, true)
d.dereferencingHeadersLock.Unlock()
if latestAcc.HeaderRemoteURL != account.HeaderRemoteURL && latestAcc.HeaderRemoteURL != "" {
// Account header URL has changed; fetch up-to-date copy and use new media ID.
latestAcc.HeaderMediaAttachmentID, err = d.fetchRemoteAccountHeader(ctx,
transport,
latestAcc.HeaderRemoteURL,
latestAcc.ID,
)
if err != nil {
log.Errorf("error fetching remote header for account %s: %v", uri, err)
} else {
latestAcc.HeaderMediaAttachmentID = newHeaderID
}
} else {
latestAcc.HeaderMediaAttachmentID = account.HeaderMediaAttachmentID // no change / empty url
}
// Fetch the latest remote account emoji IDs used in account display name/bio.
@ -338,47 +334,106 @@ func (d *deref) dereferenceAccountable(ctx context.Context, transport transport.
return nil, newErrWrongType(fmt.Errorf("DereferenceAccountable: type name %s not supported as Accountable", t.GetTypeName()))
}
func (d *deref) fetchRemoteAccountMedia(
ctx context.Context,
transport transport.Transport,
mediaRemoteURL string,
targetAccountID string,
dereferencingMap map[string]*media.ProcessingMedia,
avatar bool,
header bool,
) (string, error) {
// first check if we're already processing this media
if alreadyProcessing, ok := dereferencingMap[targetAccountID]; ok {
// we're already on it, nothing else to do
return alreadyProcessing.AttachmentID(), nil
}
avatarIRI, err := url.Parse(mediaRemoteURL)
func (d *deref) fetchRemoteAccountAvatar(ctx context.Context, tsport transport.Transport, avatarURL string, accountID string) (string, error) {
// Parse and validate provided media URL.
avatarURI, err := url.Parse(avatarURL)
if err != nil {
return "", err
}
data := func(innerCtx context.Context) (io.ReadCloser, int64, error) {
return transport.DereferenceMedia(innerCtx, avatarIRI)
// Acquire lock for derefs map.
unlock := d.derefAvatarsMu.Lock()
defer unlock()
if processing, ok := d.derefAvatars[avatarURL]; ok {
// we're already dereferencing it, nothing to do.
return processing.AttachmentID(), nil
}
processingMedia, err := d.mediaManager.ProcessMedia(ctx, data, nil, targetAccountID, &media.AdditionalMediaInfo{
RemoteURL: &mediaRemoteURL,
Avatar: &avatar,
Header: &header,
// Set the media data function to dereference avatar from URI.
data := func(ctx context.Context) (io.ReadCloser, int64, error) {
return tsport.DereferenceMedia(ctx, avatarURI)
}
// Create new media processing request from the media manager instance.
processing, err := d.mediaManager.ProcessMedia(ctx, data, nil, accountID, &media.AdditionalMediaInfo{
Avatar: func() *bool { v := false; return &v }(),
RemoteURL: &avatarURL,
})
if err != nil {
return "", err
}
// store it in our map to indicate it's in process
dereferencingMap[targetAccountID] = processingMedia
defer delete(dereferencingMap, targetAccountID)
if _, err := processingMedia.LoadAttachment(ctx); err != nil {
// Store media in map to mark as processing.
d.derefAvatars[avatarURL] = processing
// Unlock map.
unlock()
defer func() {
// On exit safely remove media from map.
unlock := d.derefAvatarsMu.Lock()
delete(d.derefAvatars, avatarURL)
unlock()
}()
// Start media attachment loading (blocking call).
if _, err := processing.LoadAttachment(ctx); err != nil {
return "", err
}
return processingMedia.AttachmentID(), nil
return processing.AttachmentID(), nil
}
func (d *deref) fetchRemoteAccountHeader(ctx context.Context, tsport transport.Transport, headerURL string, accountID string) (string, error) {
// Parse and validate provided media URL.
headerURI, err := url.Parse(headerURL)
if err != nil {
return "", err
}
// Acquire lock for derefs map.
unlock := d.derefHeadersMu.Lock()
defer unlock()
if processing, ok := d.derefHeaders[headerURL]; ok {
// we're already dereferencing it, nothing to do.
return processing.AttachmentID(), nil
}
// Set the media data function to dereference header from URI.
data := func(ctx context.Context) (io.ReadCloser, int64, error) {
return tsport.DereferenceMedia(ctx, headerURI)
}
// Create new media processing request from the media manager instance.
processing, err := d.mediaManager.ProcessMedia(ctx, data, nil, accountID, &media.AdditionalMediaInfo{
Header: func() *bool { v := true; return &v }(),
RemoteURL: &headerURL,
})
if err != nil {
return "", err
}
// Store media in map to mark as processing.
d.derefHeaders[headerURL] = processing
// Unlock map.
unlock()
defer func() {
// On exit safely remove media from map.
unlock := d.derefHeadersMu.Lock()
delete(d.derefHeaders, headerURL)
unlock()
}()
// Start media attachment loading (blocking call).
if _, err := processing.LoadAttachment(ctx); err != nil {
return "", err
}
return processing.AttachmentID(), nil
}
func (d *deref) fetchRemoteAccountEmojis(ctx context.Context, targetAccount *gtsmodel.Account, requestingUsername string) (bool, error) {