Add connect methods to libraries.

lib/clickhouse.js

@@ -14,6 +14,9 @@ export const CLICKHOUSE_DATE_FORMATS = {
 
 const log = debug('umami:clickhouse');
 
+let clickhouse;
+const enabled = Boolean(process.env.CLICKHOUSE_URL);
+
 function getClient() {
   const {
     hostname,
@@ -144,6 +147,8 @@ async function rawQuery(query, params = []) {
     log(formattedQuery);
   }
 
+  await connect();
+
   return clickhouse.query(formattedQuery).toPromise();
 }
 
@@ -159,12 +164,19 @@ async function findFirst(data) {
   return data[0] ?? null;
 }
 
-// Initialization
-const clickhouse = process.env.CLICKHOUSE_URL && (global[CLICKHOUSE] || getClient());
+async function connect() {
+  if (!clickhouse) {
+    clickhouse = process.env.CLICKHOUSE_URL && (global[CLICKHOUSE] || getClient());
+  }
+
+  return clickhouse;
+}
 
 export default {
+  enabled,
   client: clickhouse,
   log,
+  connect,
   getDateStringQuery,
   getDateQuery,
   getDateFormat,