[performance] cache mute check results (#4202)

This separates our the user mute handling from the typeconverter code, and creates a new "mutes" filter type (in a similar vein to the visibility filter) subpkg with its own result cache. This is a heavy mix of both chore given that mute calculation shouldn't have been handled in the conversion to frontend API types, and a performance bonus since we don't need to load and calculate so many things each time, just the single result each time with all necessary invalidation handled by database cache hooks.

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4202
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/internal/filter/mutes/account.go b/internal/filter/mutes/account.go
new file mode 100644
index 000000000..ecf4ffa4e
--- /dev/null
+++ b/internal/filter/mutes/account.go
@@ -0,0 +1,85 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// 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 mutes
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"code.superseriousbusiness.org/gotosocial/internal/db"
+	"code.superseriousbusiness.org/gotosocial/internal/gtscontext"
+	"code.superseriousbusiness.org/gotosocial/internal/gtserror"
+	"code.superseriousbusiness.org/gotosocial/internal/gtsmodel"
+)
+
+// NOTE:
+// we don't bother using the Mutes cache for any
+// of the accounts functions below, as there's only
+// a single cache load required of any UserMute.
+
+// AccountMuted returns whether given target account is muted by requester.
+func (f *Filter) AccountMuted(ctx context.Context, requester *gtsmodel.Account, account *gtsmodel.Account) (bool, error) {
+	mute, expired, err := f.getUserMute(ctx, requester, account)
+	if err != nil {
+		return false, err
+	} else if mute == nil {
+		return false, nil
+	}
+	return !expired, nil
+}
+
+// AccountNotificationsMuted returns whether notifications are muted for requester when incoming from given target account.
+func (f *Filter) AccountNotificationsMuted(ctx context.Context, requester *gtsmodel.Account, account *gtsmodel.Account) (bool, error) {
+	mute, expired, err := f.getUserMute(ctx, requester, account)
+	if err != nil {
+		return false, err
+	} else if mute == nil {
+		return false, nil
+	}
+	return *mute.Notifications && !expired, nil
+}
+
+func (f *Filter) getUserMute(ctx context.Context, requester *gtsmodel.Account, account *gtsmodel.Account) (*gtsmodel.UserMute, bool, error) {
+	if requester == nil {
+		// Un-authed so no account
+		// is possible to be muted.
+		return nil, false, nil
+	}
+
+	// Look for mute against target.
+	mute, err := f.state.DB.GetMute(
+		gtscontext.SetBarebones(ctx),
+		requester.ID,
+		account.ID,
+	)
+	if err != nil && !errors.Is(err, db.ErrNoEntries) {
+		return nil, false, gtserror.Newf("db error getting user mute: %w", err)
+	}
+
+	if mute == nil {
+		// No user mute exists!
+		return nil, false, nil
+	}
+
+	// Get current time.
+	now := time.Now()
+
+	// Return whether mute is expired.
+	return mute, mute.Expired(now), nil
+}