Allow to define start worker interval

Author: xinshen

app/app.py

@@ -60,7 +60,7 @@ def main():
             worker.daemon = True
             worker.start()
 
-            time.sleep(60)
+            time.sleep(settings['start_worker_interval'])
             num += 1
 
     logger.info('All workers are running!')

app/conf.py

@@ -16,7 +16,7 @@ def __init__(self):
         """
 
         with open('defaults.yml', 'r') as config_file:
-            default_config = yaml.load(config_file)
+            default_config = yaml.load(config_file, Loader=yaml.FullLoader)
 
         if os.path.isfile('config.yml'):
             with open('config.yml', 'r') as config_file:

app/defaults.yml

@@ -8,6 +8,7 @@ settings:
   enable_charts: false
   output_mode: cli
   update_interval: 300
+  start_worker_interval: 60
   market_data_chunk_size: 20
   market_pairs: null
   timezone: UTC