refactor: db connectors

src/datasource-zabbix/zabbix/connectors/sql/postgres.js

@@ -0,0 +1,48 @@
+/**
+ * Postgres queries
+ */
+
+const ITEMID_FORMAT = 'FM99999999999999999999';
+
+function historyQuery(itemids, table, timeFrom, timeTill, intervalSec, aggFunction) {
+  let time_expression = `clock / ${intervalSec} * ${intervalSec}`;
+  let query = `
+    SELECT to_char(itemid, '${ITEMID_FORMAT}') AS metric, ${time_expression} AS time, ${aggFunction}(value) AS value
+    FROM ${table}
+    WHERE itemid IN (${itemids})
+      AND clock > ${timeFrom} AND clock < ${timeTill}
+    GROUP BY 1, 2
+    ORDER BY time ASC
+  `;
+  return query;
+}
+
+function trendsQuery(itemids, table, timeFrom, timeTill, intervalSec, aggFunction, valueColumn) {
+  let time_expression = `clock / ${intervalSec} * ${intervalSec}`;
+  let query = `
+    SELECT to_char(itemid, '${ITEMID_FORMAT}') AS metric, ${time_expression} AS time, ${aggFunction}(${valueColumn}) AS value
+    FROM ${table}
+    WHERE itemid IN (${itemids})
+      AND clock > ${timeFrom} AND clock < ${timeTill}
+    GROUP BY 1, 2
+    ORDER BY time ASC
+  `;
+  return query;
+}
+
+const TEST_QUERY = `
+  SELECT to_char(itemid, '${ITEMID_FORMAT}') AS metric, clock AS time, value_avg AS value
+  FROM trends_uint LIMIT 1
+`;
+
+function testQuery() {
+  return TEST_QUERY;
+}
+
+const postgres = {
+  historyQuery,
+  trendsQuery,
+  testQuery
+};
+
+export default postgres;