mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-10-31 22:18:52 +00:00
40f9eefc21
* [bugfix] Pass `latest` to dereferenceThread instead of barebones status * only mark status orphaned if visibility suggests parent is really deleted * tone down "not deref'd" warnings, since they represent a legit visibility situation * remove FAQ entry for "status not deref'd yet"
386 lines
12 KiB
Go
386 lines
12 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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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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//
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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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//
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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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package dereferencing
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import (
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"context"
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"net/http"
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"net/url"
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"codeberg.org/gruf/go-kv"
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"github.com/superseriousbusiness/activity/pub"
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"github.com/superseriousbusiness/gotosocial/internal/ap"
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"github.com/superseriousbusiness/gotosocial/internal/config"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
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"github.com/superseriousbusiness/gotosocial/internal/log"
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)
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// maxIter defines how many iterations of descendants or
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// ancesters we are willing to follow before returning error.
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const maxIter = 1000
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// dereferenceThread handles dereferencing status thread after
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// fetch. Passing off appropriate parts to be enqueued for async
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// processing, or handling some parts synchronously when required.
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func (d *Dereferencer) dereferenceThread(
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ctx context.Context,
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requestUser string,
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uri *url.URL,
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status *gtsmodel.Status,
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statusable ap.Statusable,
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isNew bool,
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) {
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if isNew {
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// This is a new status that we need the ancestors of in
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// order to determine visibility. Perform the initial part
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// of thread dereferencing, i.e. parents, synchronously.
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err := d.DereferenceStatusAncestors(ctx, requestUser, status)
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if err != nil {
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log.Error(ctx, err)
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}
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// Enqueue dereferencing remaining status thread, (children), asychronously .
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d.state.Workers.Federator.MustEnqueueCtx(ctx, func(ctx context.Context) {
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if err := d.DereferenceStatusDescendants(ctx, requestUser, uri, statusable); err != nil {
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log.Error(ctx, err)
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}
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})
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} else {
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// This is an existing status, dereference the WHOLE thread asynchronously.
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d.state.Workers.Federator.MustEnqueueCtx(ctx, func(ctx context.Context) {
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if err := d.DereferenceStatusAncestors(ctx, requestUser, status); err != nil {
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log.Error(ctx, err)
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}
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if err := d.DereferenceStatusDescendants(ctx, requestUser, uri, statusable); err != nil {
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log.Error(ctx, err)
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}
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})
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}
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}
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// DereferenceStatusAncestors iterates upwards from the given status, using InReplyToURI, to ensure that as many parent statuses as possible are dereferenced.
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func (d *Dereferencer) DereferenceStatusAncestors(ctx context.Context, username string, status *gtsmodel.Status) error {
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// Start log entry with fields
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l := log.WithContext(ctx).
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WithFields(kv.Fields{
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{"username", username},
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{"original", status.URI},
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}...)
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// Keep track of already dereferenced statuses
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// for this ancestor thread to prevent recursion.
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derefdStatuses := make(map[string]struct{}, 10)
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// Mark given status as the one
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// we're currently working on.
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current := status
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for i := 0; i < maxIter; i++ {
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if current.InReplyToURI == "" {
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// Status has no parent, we've
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// reached the top of the chain.
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return nil
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}
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l = l.WithField("parent", current.InReplyToURI)
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l.Trace("following status ancestor")
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// Parse status parent URI for later use.
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uri, err := url.Parse(current.InReplyToURI)
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if err != nil {
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l.Warnf("invalid uri: %v", err)
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return nil
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}
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// Check whether this parent has already been deref'd.
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if _, ok := derefdStatuses[current.InReplyToURI]; ok {
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l.Warn("self referencing status ancestor")
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return nil
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}
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// Add this status's parent URI to map of deref'd.
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derefdStatuses[current.InReplyToURI] = struct{}{}
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// Fetch parent status by current's reply URI, this handles
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// case of existing (updating if necessary) or a new status.
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parent, _, _, err := d.getStatusByURI(ctx, username, uri)
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// Check for a returned HTTP code via error.
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switch code := gtserror.StatusCode(err); {
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// 404 may indicate deletion, but can also
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// indicate that we don't have permission to
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// view the status (it's followers-only and
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// we don't follow, for example).
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case code == http.StatusNotFound:
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// If this reply is followers-only or stricter,
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// we can safely assume the status it replies
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// to is also followers only or stricter.
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//
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// In this case we should leave the inReplyTo
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// URI in place for visibility filtering,
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// and just return since we can go no further.
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if status.Visibility == gtsmodel.VisibilityFollowersOnly ||
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status.Visibility == gtsmodel.VisibilityMutualsOnly ||
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status.Visibility == gtsmodel.VisibilityDirect {
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return nil
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}
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// If the reply is public or unlisted then
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// likely the replied-to status is/was public
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// or unlisted and has indeed been deleted,
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// fall through to the Gone case to clean up.
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fallthrough
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// Gone (410) definitely indicates deletion.
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// Update the status to remove references to
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// the now-gone parent.
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case code == http.StatusGone:
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l.Trace("status orphaned")
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current.InReplyToID = ""
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current.InReplyToURI = ""
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current.InReplyToAccountID = ""
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current.InReplyTo = nil
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current.InReplyToAccount = nil
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if err := d.state.DB.UpdateStatus(ctx,
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current,
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"in_reply_to_id",
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"in_reply_to_uri",
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"in_reply_to_account_id",
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); err != nil {
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return gtserror.Newf("db error updating status %s: %w", current.ID, err)
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}
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return nil
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// An error was returned for a status during
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// an attempted NEW dereference, return here.
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case err != nil && current.InReplyToID == "":
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return gtserror.Newf("error dereferencing new %s: %w", current.InReplyToURI, err)
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// An error was returned for an existing parent,
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// we simply treat this as a temporary situation.
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// (we fallback to using existing parent status).
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case err != nil:
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l.Errorf("error getting parent: %v", err)
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// The ID has changed for currently stored parent ID
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// (which may be empty, if new!) and fetched version.
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//
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// Update the current's inReplyTo fields to parent.
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case current.InReplyToID != parent.ID:
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l.Tracef("parent changed %s => %s", current.InReplyToID, parent.ID)
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current.InReplyToAccountID = parent.AccountID
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current.InReplyToAccount = parent.Account
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current.InReplyToURI = parent.URI
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current.InReplyToID = parent.ID
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if err := d.state.DB.UpdateStatus(ctx,
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current,
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"in_reply_to_id",
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"in_reply_to_uri",
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"in_reply_to_account_id",
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); err != nil {
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return gtserror.Newf("db error updating status %s: %w", current.ID, err)
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}
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}
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// Set next parent to use.
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current.InReplyTo = parent
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current = current.InReplyTo
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}
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return gtserror.Newf("reached %d ancestor iterations for %q", maxIter, status.URI)
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}
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// DereferenceStatusDescendents iterates downwards from the given status, using its replies, to ensure that as many children statuses as possible are dereferenced.
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func (d *Dereferencer) DereferenceStatusDescendants(ctx context.Context, username string, statusIRI *url.URL, parent ap.Statusable) error {
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statusIRIStr := statusIRI.String()
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// Start log entry with fields
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l := log.WithContext(ctx).
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WithFields(kv.Fields{
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{"username", username},
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{"status", statusIRIStr},
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}...)
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// Log function start
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l.Trace("beginning")
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// OUR instance hostname.
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localhost := config.GetHost()
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// Keep track of already dereferenced collection
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// pages for this thread to prevent recursion.
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derefdPages := make(map[string]struct{}, 10)
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// frame represents a single stack frame when
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// iteratively derefencing status descendants.
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type frame struct {
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// page is the current activity streams
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// collection page we are on (as we often
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// push a frame to stack mid-paging).
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page ap.CollectionPageIterator
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// pageURI is the URI string of
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// the frame's collection page
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// (is useful for logging).
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pageURI string
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}
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var (
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// current stack frame
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current *frame
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// stack is a list of "shelved" descendand iterator
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// frames. this is pushed to when a child status frame
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// is found that we need to further iterate down, and
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// popped from into 'current' when that child's tree
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// of further descendants is exhausted.
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stack = []*frame{
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func() *frame {
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// Start input frame is built from the first input.
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page, pageURI := getAttachedStatusCollectionPage(parent)
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if page == nil {
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return nil
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}
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return &frame{page: page, pageURI: pageURI}
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}(),
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}
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// popStack will remove and return the top frame
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// from the stack, or nil if currently empty.
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popStack = func() *frame {
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if len(stack) == 0 {
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return nil
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}
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// Get frame index
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idx := len(stack) - 1
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// Pop last frame
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frame := stack[idx]
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stack = stack[:idx]
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return frame
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}
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)
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stackLoop:
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for i := 0; i < maxIter; i++ {
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// Pop next frame, nil means we are at end
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if current = popStack(); current == nil {
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return nil
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}
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pageLoop:
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for {
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l.Tracef("following collection page: %s", current.pageURI)
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itemLoop:
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for {
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// Get next item from page iter.
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next := current.page.NextItem()
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if next == nil {
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break itemLoop
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}
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// Check for available IRI.
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itemIRI, _ := pub.ToId(next)
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if itemIRI == nil {
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continue itemLoop
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}
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if itemIRI.Host == localhost {
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// This child is one of ours,
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continue itemLoop
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}
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// Dereference the remote status and store in the database.
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// getStatusByURI guards against the following conditions:
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// - refetching recently fetched statuses (recursion!)
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// - remote domain is blocked (will return unretrievable)
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// - any http type error for a new status returns unretrievable
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_, statusable, _, err := d.getStatusByURI(ctx, username, itemIRI)
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if err != nil {
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l.Errorf("error dereferencing remote status %s: %v", itemIRI, err)
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continue itemLoop
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}
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if statusable == nil {
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// A nil statusable return from
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// getStatusByURI() indicates a
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// remote status that was already
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// dereferenced recently (so no
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// need to go through descendents).
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continue itemLoop
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}
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// Extract any attached collection + ID URI from status.
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page, pageURI := getAttachedStatusCollectionPage(statusable)
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if page == nil {
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continue itemLoop
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}
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// Put current and next frame at top of stack
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stack = append(stack, current, &frame{
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pageURI: pageURI,
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page: page,
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})
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// Now start at top of loop
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continue stackLoop
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}
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// Get the next page from iterator.
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next := current.page.NextPage()
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if next == nil || !next.IsIRI() {
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continue stackLoop
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}
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// Get the next page IRI.
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nextURI := next.GetIRI()
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nextURIStr := nextURI.String()
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// Check whether this page has already been deref'd.
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if _, ok := derefdPages[nextURIStr]; ok {
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l.Warnf("self referencing collection page(s): %s", nextURIStr)
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continue stackLoop
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}
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// Mark this collection page as deref'd.
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derefdPages[nextURIStr] = struct{}{}
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// Dereference this next collection page by its IRI.
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collectionPage, err := d.dereferenceCollectionPage(ctx,
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username,
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nextURI,
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)
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if err != nil {
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l.Errorf("error dereferencing collection page %q: %s", nextURIStr, err)
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continue stackLoop
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}
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// Set the next collection page.
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current.page = collectionPage
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current.pageURI = nextURIStr
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continue pageLoop
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}
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}
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return gtserror.Newf("reached %d descendant iterations for %q", maxIter, statusIRIStr)
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}
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