fix(core): update

ts/smartclickhouse.classes.smartclickhouse.ts

@@ -9,6 +9,7 @@ export interface IClickhouseConstructorOptions {
 
 export class SmartClickHouseDb {
   public options: IClickhouseConstructorOptions;
+  public defaultClient: plugins.clickhouse.ClickHouseClient;
   public clickhouseClient: plugins.clickhouse.ClickHouseClient;
 
   constructor(optionsArg: IClickhouseConstructorOptions) {
@@ -32,23 +33,38 @@ export class SmartClickHouseDb {
     // the password
     this.options.password ? defaultOptions.password = this.options.password : null;
     // lets connect
-    const defaultClient = new plugins.clickhouse.ClickHouseClient({
+    this.defaultClient = new plugins.clickhouse.ClickHouseClient({
       ...defaultOptions,
       database: 'default',
     });
+    await this.pingDatabaseUntilAvailable();
     console.log(`Create database ${this.options.database}, if it does not exist...`);
-    if (dropOld) {
-      await defaultClient.queryPromise(`DROP DATABASE IF EXISTS ${this.options.database}`);
-    }
-    await defaultClient.queryPromise(`CREATE DATABASE IF NOT EXISTS ${this.options.database}`);
+    await this.createDatabase(dropOld);
 
     console.log(`Ensured database. Now connecting to wanted database: ${this.options.database}`);
     this.clickhouseClient = new plugins.clickhouse.ClickHouseClient({
       ...defaultOptions
     });
-    console.log(`trying to ping database...`);
-    const result = await this.clickhouseClient.ping();
-    console.log(`Ping successfull?: ${result}`);
+  }
+
+  public async createDatabase(dropOld: boolean = false) {
+    if (dropOld) {
+      await this.defaultClient.queryPromise(`DROP DATABASE IF EXISTS ${this.options.database}`);
+    }
+    await this.defaultClient.queryPromise(`CREATE DATABASE IF NOT EXISTS ${this.options.database}`);
+  }
+
+  public async pingDatabaseUntilAvailable() {
+    let available = false;
+    while(!available) {
+      available = await this.defaultClient.ping().catch(err => {
+        return false;
+      });
+      if (!available) {
+        console.log(`NOT OK: tried pinging ${this.options.url}... Trying again in 5 seconds.`);
+        await plugins.smartdelay.delayFor(5000);
+      }
+    }
   }
 
   /**