gotosocial/internal/federation/dereferencing/util.go

// 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 dereferencing

import (
	"slices"

	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
)

// doOnce wraps a function to only perform it once.
func doOnce(fn func()) func() {
	var once int32
	return func() {
		if once == 0 {
			fn()
			once = 1
		}
	}
}

// pollChanged returns whether a poll has changed in way that
// indicates that this should be an entirely new poll. i.e. if
// the available options have changed, or the expiry has increased.
func pollChanged(existing, latest *gtsmodel.Poll) bool {
	return !slices.Equal(existing.Options, latest.Options) ||
		!existing.ExpiresAt.Equal(latest.ExpiresAt)
}

// pollUpdated returns whether a poll has updated, i.e. if the
// vote counts have changed, or if it has expired / been closed.
func pollUpdated(existing, latest *gtsmodel.Poll) bool {
	return *existing.Voters != *latest.Voters ||
		!slices.Equal(existing.Votes, latest.Votes) ||
		!existing.ClosedAt.Equal(latest.ClosedAt)
}

// pollJustClosed returns whether a poll has *just* closed.
func pollJustClosed(existing, latest *gtsmodel.Poll) bool {
	return existing.ClosedAt.IsZero() && latest.Closed()
}