Improving Dockerfile

Dockerfile

@@ -12,8 +12,7 @@ COPY code/backend/requirements.txt /home/beacon/elixir-beacon/
 WORKDIR /home/beacon/elixir-beacon
 RUN pip3 install --default-timeout=60 -i https://pypi.lcsb.uni.lu/simple -r requirements.txt
 # Build front-end files
-COPY code/frontend/* /home/beacon/elixir-beacon/code/frontend/
-RUN ls -laR /home/beacon/elixir-beacon/code/frontend
+COPY code/frontend/ /home/beacon/elixir-beacon/code/frontend/
 WORKDIR /home/beacon/elixir-beacon/code/frontend
 RUN yarn install && \
     node node_modules/gulp/bin/gulp.js

code/backend/beacon/beacon.py

@@ -30,6 +30,15 @@ class Beacon(object):
         info_for_user = self.datasources_manager.update_authorization_info(info, user_groups)
         return info_for_user
 
+    def shutdown(self, signum, frame):
+        """
+        Closes the opened connections.
+        Warning - closes only stateful connections, it does nothing to stateless ones.
+        For the optional parameters, see https://docs.python.org/3.9/library/signal.html#example
+        """
+        logger.debug(' Received SIGINT or SIGTERM signal, disconnecting stateful data sources')
+        self.datasources_manager.disconnect_data_sources()
+
     def handle_include_dataset_responses(self, response: List[dict], responses, flag: str):
         flag = flag.upper()
 

code/backend/beacon/datasources/manager.py

@@ -21,14 +21,23 @@ class DataSourcesManager:
         self.datasets = []
         self.declared_connectors = []
         self.unparsed_structure = {}
+        self.connected = False
         self.validator = DataSourcesValidator()
 
     def reset(self):
+        self.disconnect_data_sources()
         self.sources = {}
         self.data_sources = {}
         self.declared_connectors = []
         self.unparsed_structure = {}
 
+    def disconnect_data_sources(self):
+        if not self.connected:
+            return
+        for data_source in self.data_sources:
+            data_source.disconnect()
+        self.connected = False
+
     def load_data_sources_information_from_yaml_file(self, path_to_yaml_file: str):
         self.reset()
         self.unparsed_structure = load_yaml_file(path_to_yaml_file)
@@ -47,6 +56,7 @@ class DataSourcesManager:
     def initialize_data_sources(self, data_sources: List[dict]):
         for data_source in data_sources:
             self.initialize_data_source(data_source)
+        self.connected = True
 
     def initialize_data_source(self, data_source: dict):
         new_data_source_id = data_source.get('id')