/* ** 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" ) // connectionsHandler executes select from pg_stat_activity command and returns JSON if all is OK or nil otherwise. func connectionsHandler(ctx context.Context, conn PostgresClient, _ string, _ map[string]string, _ ...string) (interface{}, error) { var connectionsJSON string query := `SELECT row_to_json(T) FROM ( SELECT sum(CASE WHEN state = 'active' THEN 1 ELSE 0 END) AS active, sum(CASE WHEN state = 'idle' THEN 1 ELSE 0 END) AS idle, sum(CASE WHEN state = 'idle in transaction' THEN 1 ELSE 0 END) AS idle_in_transaction, sum(CASE WHEN state = 'idle in transaction (aborted)' THEN 1 ELSE 0 END) AS idle_in_transaction_aborted, sum(CASE WHEN state = 'fastpath function call' THEN 1 ELSE 0 END) AS fastpath_function_call, sum(CASE WHEN state = 'disabled' THEN 1 ELSE 0 END) AS disabled, count(*) AS total, count(*)*100/(SELECT current_setting('max_connections')::int) AS total_pct, sum(CASE WHEN wait_event IS NOT NULL THEN 1 ELSE 0 END) AS waiting, (SELECT count(*) FROM pg_prepared_xacts) AS prepared FROM pg_stat_activity WHERE datid IS NOT NULL AND state IS NOT NULL) T;` row, err := conn.QueryRow(ctx, query) if err != nil { return nil, zbxerr.ErrorCannotFetchData.Wrap(err) } err = row.Scan(&connectionsJSON) if err != nil { if errors.Is(err, pgx.ErrNoRows) { return nil, zbxerr.ErrorEmptyResult.Wrap(err) } return nil, zbxerr.ErrorCannotFetchData.Wrap(err) } return connectionsJSON, nil }