implement channel API (no use yet)

api/db.go

@@ -239,3 +239,102 @@ func dbDeleteMessage(id string) error {
 	slog.Debug("db: message deleted", "messageid", id)
 	return nil
 }
+
+func dbAddChannel(channel *Channel) error {
+	query := `INSERT INTO channels (id, name, type, created) VALUES (?, ?, ?, ?)`
+	err := db.Session.Query(query,
+		channel.ID,
+		channel.Name,
+		channel.Type,
+		channel.Created).Exec()
+	if err != nil {
+		slog.Error("db: failed to add channel", "error", err, "channelid", channel.ID)
+		return fmt.Errorf("failed to add channel")
+	}
+
+	slog.Debug("db: channel added", "channelid", channel.ID)
+	return nil
+}
+
+func dbGetChannel(id string) (*Channel, error) {
+	query := `SELECT id, name, type, created FROM channels WHERE id = ?`
+	var channel Channel
+	err := db.Session.Query(query, id).Scan(
+		&channel.ID,
+		&channel.Name,
+		&channel.Type,
+		&channel.Created)
+	if err == gocql.ErrNotFound {
+		slog.Debug("db: channel not found", "channelid", id)
+		return nil, errors.New("Channel not found")
+	} else if err != nil {
+		slog.Error("db: failed to query channel", "error", err)
+		return nil, fmt.Errorf("failed to query channel")
+	}
+
+	slog.Debug("db: channel found", "channelid", channel.ID)
+	return &channel, nil
+}
+
+func dbGetAllChannels() ([]*Channel, error) {
+	query := `SELECT id, name, type, created FROM channels`
+	iter := db.Session.Query(query).Iter()
+	defer iter.Close()
+
+	var channels []*Channel
+	for {
+		channel := &Channel{}
+		if !iter.Scan(
+			&channel.ID,
+			&channel.Name,
+			&channel.Type,
+			&channel.Created) {
+			break
+		}
+		channels = append(channels, channel)
+	}
+
+	if err := iter.Close(); err != nil {
+		slog.Error("db: failed to iterate channels", "error", err)
+		return nil, fmt.Errorf("failed to iterate channels")
+	}
+
+	if len(channels) == 0 {
+		slog.Debug("db: no channels found")
+		return nil, errors.New("no channels found")
+	}
+
+	slog.Debug("db: channel list returned")
+	return channels, nil
+}
+
+func dbUpdateChannel(updatedChannel *Channel) error {
+	query := `UPDATE channels SET name = ?, type = ?, created = ? WHERE id = ?`
+
+	err := db.Session.Query(query,
+		updatedChannel.Name,
+		updatedChannel.Type,
+		updatedChannel.Created,
+		updatedChannel.ID).Exec()
+
+	if err != nil {
+		slog.Error("db: failed to update channel", "error", err, "channelid", updatedChannel.ID)
+		return fmt.Errorf("failed to update channel")
+	}
+
+	slog.Debug("db: channel updated", "channelid", updatedChannel.ID)
+	return nil
+}
+
+func dbDeleteChannel(id string) error {
+	query := `DELETE FROM channels WHERE id = ?`
+
+	err := db.Session.Query(query, id).Exec()
+	if err != nil {
+		slog.Error("db: failed to delete channel", "error", err)
+		return fmt.Errorf("failed to delete channel")
+	}
+
+	slog.Debug("db: channel deleted")
+	return nil
+}