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/*
GoToSocial
Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
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 federatingdb
import (
"context"
"sync"
"time"
"github.com/superseriousbusiness/activity/pub"
"github.com/superseriousbusiness/activity/streams/vocab"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/typeutils"
)
// DB wraps the pub.Database interface with a couple of custom functions for GoToSocial.
type DB interface {
pub.Database
Undo(ctx context.Context, undo vocab.ActivityStreamsUndo) error
Accept(ctx context.Context, accept vocab.ActivityStreamsAccept) error
Reject(ctx context.Context, reject vocab.ActivityStreamsReject) error
Announce(ctx context.Context, announce vocab.ActivityStreamsAnnounce) error
}
// FederatingDB uses the underlying DB interface to implement the go-fed pub.Database interface.
// It doesn't care what the underlying implementation of the DB interface is, as long as it works.
type federatingDB struct {
mutex sync.Mutex
locks map[string]*mutex
pool sync.Pool
db db.DB
typeConverter typeutils.TypeConverter
}
// New returns a DB interface using the given database and config
func New(db db.DB) DB {
fdb := federatingDB{
mutex: sync.Mutex{},
locks: make(map[string]*mutex, 100),
pool: sync.Pool{New: func() interface{} { return &mutex{} }},
db: db,
typeConverter: typeutils.NewConverter(db),
}
go fdb.cleanupLocks()
return &fdb
}
func (db *federatingDB) cleanupLocks() {
for {
// Sleep for a minute...
time.Sleep(time.Minute)
// Delete unused locks from map
db.mutex.Lock()
for id, mu := range db.locks {
if !mu.inUse() {
delete(db.locks, id)
db.pool.Put(mu)
}
}
db.mutex.Unlock()
}
}
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