1 files changed, 199 insertions, 0 deletions
diff --git a/internal/db/bundb/timeline.go b/internal/db/bundb/timeline.go
new file mode 100644
index 000000000..b62ad4c50
--- /dev/null
+++ b/internal/db/bundb/timeline.go
@@ -0,0 +1,199 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 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 bundb
+
+import (
+	"context"
+	"database/sql"
+	"sort"
+
+	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/db"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/uptrace/bun"
+)
+
+type timelineDB struct {
+	config *config.Config
+	conn   *bun.DB
+	log    *logrus.Logger
+}
+
+func (t *timelineDB) GetHomeTimeline(ctx context.Context, accountID string, maxID string, sinceID string, minID string, limit int, local bool) ([]*gtsmodel.Status, db.Error) {
+	statuses := []*gtsmodel.Status{}
+	q := t.conn.
+		NewSelect().
+		Model(&statuses)
+
+	q = q.ColumnExpr("status.*").
+		// Find out who accountID follows.
+		Join("LEFT JOIN follows AS f ON f.target_account_id = status.account_id").
+		// Sort by highest ID (newest) to lowest ID (oldest)
+		Order("status.id DESC")
+
+	if maxID != "" {
+		// return only statuses LOWER (ie., older) than maxID
+		q = q.Where("status.id < ?", maxID)
+	}
+
+	if sinceID != "" {
+		// return only statuses HIGHER (ie., newer) than sinceID
+		q = q.Where("status.id > ?", sinceID)
+	}
+
+	if minID != "" {
+		// return only statuses HIGHER (ie., newer) than minID
+		q = q.Where("status.id > ?", minID)
+	}
+
+	if local {
+		// return only statuses posted by local account havers
+		q = q.Where("status.local = ?", local)
+	}
+
+	if limit > 0 {
+		// limit amount of statuses returned
+		q = q.Limit(limit)
+	}
+
+	// Use a WhereGroup here to specify that we want EITHER statuses posted by accounts that accountID follows,
+	// OR statuses posted by accountID itself (since a user should be able to see their own statuses).
+	//
+	// This is equivalent to something like WHERE ... AND (... OR ...)
+	// See: https://bun.uptrace.dev/guide/queries.html#select
+	whereGroup := func(*bun.SelectQuery) *bun.SelectQuery {
+		return q.
+			WhereOr("f.account_id = ?", accountID).
+			WhereOr("status.account_id = ?", accountID)
+	}
+
+	q = q.WhereGroup(" AND ", whereGroup)
+
+	return statuses, processErrorResponse(q.Scan(ctx))
+}
+
+func (t *timelineDB) GetPublicTimeline(ctx context.Context, accountID string, maxID string, sinceID string, minID string, limit int, local bool) ([]*gtsmodel.Status, db.Error) {
+	statuses := []*gtsmodel.Status{}
+
+	q := t.conn.
+		NewSelect().
+		Model(&statuses).
+		Where("visibility = ?", gtsmodel.VisibilityPublic).
+		Where("? IS NULL", bun.Ident("in_reply_to_id")).
+		Where("? IS NULL", bun.Ident("in_reply_to_uri")).
+		Where("? IS NULL", bun.Ident("boost_of_id")).
+		Order("status.id DESC")
+
+	if maxID != "" {
+		q = q.Where("status.id < ?", maxID)
+	}
+
+	if sinceID != "" {
+		q = q.Where("status.id > ?", sinceID)
+	}
+
+	if minID != "" {
+		q = q.Where("status.id > ?", minID)
+	}
+
+	if local {
+		q = q.Where("status.local = ?", local)
+	}
+
+	if limit > 0 {
+		q = q.Limit(limit)
+	}
+
+	return statuses, processErrorResponse(q.Scan(ctx))
+}
+
+// TODO optimize this query and the logic here, because it's slow as balls -- it takes like a literal second to return with a limit of 20!
+// It might be worth serving it through a timeline instead of raw DB queries, like we do for Home feeds.
+func (t *timelineDB) GetFavedTimeline(ctx context.Context, accountID string, maxID string, minID string, limit int) ([]*gtsmodel.Status, string, string, db.Error) {
+
+	faves := []*gtsmodel.StatusFave{}
+
+	fq := t.conn.
+		NewSelect().
+		Model(&faves).
+		Where("account_id = ?", accountID).
+		Order("id DESC")
+
+	if maxID != "" {
+		fq = fq.Where("id < ?", maxID)
+	}
+
+	if minID != "" {
+		fq = fq.Where("id > ?", minID)
+	}
+
+	if limit > 0 {
+		fq = fq.Limit(limit)
+	}
+
+	err := fq.Scan(ctx)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return nil, "", "", db.ErrNoEntries
+		}
+		return nil, "", "", err
+	}
+
+	if len(faves) == 0 {
+		return nil, "", "", db.ErrNoEntries
+	}
+
+	// map[statusID]faveID -- we need this to sort statuses by fave ID rather than their own ID
+	statusesFavesMap := map[string]string{}
+
+	in := []string{}
+	for _, f := range faves {
+		statusesFavesMap[f.StatusID] = f.ID
+		in = append(in, f.StatusID)
+	}
+
+	statuses := []*gtsmodel.Status{}
+	err = t.conn.
+		NewSelect().
+		Model(&statuses).
+		Where("id IN (?)", bun.In(in)).
+		Scan(ctx)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return nil, "", "", db.ErrNoEntries
+		}
+		return nil, "", "", err
+	}
+
+	if len(statuses) == 0 {
+		return nil, "", "", db.ErrNoEntries
+	}
+
+	// arrange statuses by fave ID
+	sort.Slice(statuses, func(i int, j int) bool {
+		statusI := statuses[i]
+		statusJ := statuses[j]
+		return statusesFavesMap[statusI.ID] < statusesFavesMap[statusJ.ID]
+	})
+
+	nextMaxID := faves[len(faves)-1].ID
+	prevMinID := faves[0].ID
+	return statuses, nextMaxID, prevMinID, nil
+}