Config class (#51)

* Add new Config class to handle loading config files

* Use new config class in api_server.py

src/utilities/config.py

@@ -0,0 +1,36 @@
+import os
+import yaml
+
+
+class Config:
+    # Initialize class variables with default values
+    upload_folder = "~/zordon-uploads/"
+    update_engines_on_launch = True
+    max_content_path = 100000000
+    server_log_level = 'debug'
+    log_buffer_length = 250
+    subjob_connection_timeout = 120
+    flask_log_level = 'error'
+    flask_debug_enable = False
+    queue_eval_seconds = 1
+    port_number = 8080
+    enable_split_jobs = True
+    download_timeout_seconds = 120
+
+    @classmethod
+    def load_config(cls, config_path):
+        with open(config_path, 'r') as ymlfile:
+            cfg = yaml.safe_load(ymlfile)
+
+        cls.upload_folder = os.path.expanduser(cfg.get('upload_folder', cls.upload_folder))
+        cls.update_engines_on_launch = cfg.get('update_engines_on_launch', cls.update_engines_on_launch)
+        cls.max_content_path = cfg.get('max_content_path', cls.max_content_path)
+        cls.server_log_level = cfg.get('server_log_level', cls.server_log_level)
+        cls.log_buffer_length = cfg.get('log_buffer_length', cls.log_buffer_length)
+        cls.subjob_connection_timeout = cfg.get('subjob_connection_timeout', cls.subjob_connection_timeout)
+        cls.flask_log_level = cfg.get('flask_log_level', cls.flask_log_level)
+        cls.flask_debug_enable = cfg.get('flask_debug_enable', cls.flask_debug_enable)
+        cls.queue_eval_seconds = cfg.get('queue_eval_seconds', cls.queue_eval_seconds)
+        cls.port_number = cfg.get('port_number', cls.port_number)
+        cls.enable_split_jobs = cfg.get('enable_split_jobs', cls.enable_split_jobs)
+        cls.download_timeout_seconds = cfg.get('download_timeout_seconds', cls.download_timeout_seconds)