[api] Attempt reconnection on websocket errors (#65)

Co-authored-by: Dmitryii Osipov <[email protected]>

server/src/helpers/gear.ts

@@ -29,12 +29,27 @@ export class GearApi {
       runtime: this.runtime,
       signedExtensions: this.signedExtensions,
     });
+
+    this.api.on('connected', () => {
+      logger.info('Connected established!');
+    });
+
     this.api.on('disconnected', () => {
-      logger.warn('Reconnection...');
+      logger.warn('Disconnected from node. Attempting to reconnect.');
       this.connect();
     });
+
+    this.api.on('error', (err: Error) => {
+      logger.error(
+        'An error occurred with the node connection. Sleeping for 60 seconds then attempting to reconnect.',
+        { error: err }
+      );
+
+      const sleep = (ms: number) => new Promise(r => setTimeout(r, ms));
+      sleep(60000).then(this.connect);
+    });
+
     this.genesis = this.api.genesisHash.toHex();
-    return this.api;
   }
 
   static async connect(config: NetworkConfig): Promise<GearApi> {