/* ** Zabbix ** Copyright 2001-2024 Zabbix SIA ** ** Licensed under the Apache License, Version 2.0 (the "License"); ** you may not use this file except in compliance with the License. ** You may obtain a copy of the License at ** ** http://www.apache.org/licenses/LICENSE-2.0 ** ** Unless required by applicable law or agreed to in writing, software ** distributed under the License is distributed on an "AS IS" BASIS, ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. ** See the License for the specific language governing permissions and ** limitations under the License. **/ package plugin import ( "context" "errors" "github.com/jackc/pgx/v4" "golang.zabbix.com/sdk/zbxerr" ) // bgwriterHandler executes select with statistics from pg_stat_bgwriter // and returns JSON if all is OK or nil otherwise. func bgwriterHandler(ctx context.Context, conn PostgresClient, _ string, _ map[string]string, _ ...string) (interface{}, error) { var bgwriterJSON string query := ` SELECT row_to_json (T) FROM ( SELECT checkpoints_timed , checkpoints_req , checkpoint_write_time , checkpoint_sync_time , buffers_checkpoint , buffers_clean , maxwritten_clean , buffers_backend , buffers_backend_fsync , buffers_alloc FROM pg_catalog.pg_stat_bgwriter ) T ;` row, err := conn.QueryRow(ctx, query) if err != nil { return nil, zbxerr.ErrorCannotFetchData.Wrap(err) } err = row.Scan(&bgwriterJSON) if err != nil { if errors.Is(err, pgx.ErrNoRows) { return nil, zbxerr.ErrorEmptyResult.Wrap(err) } return nil, zbxerr.ErrorCannotFetchData.Wrap(err) } return bgwriterJSON, nil }