roleStage: use-cases now get fetched from the server

src/data-hub/role-stage-discovery-microservice/app/processing/fetching/fetching.py

@@ -55,22 +55,45 @@ def _fetch_nodes(use_case: str, layer: Layer) -> List[Dict]:
     
     return nodes
 
-def fetch_nodes_from_semantic_linking(use_case: str):
-    # prune DB 
-    repository = Repository()
-    repository.delete_all_layers()
-    repository.delete_all_nodes()
+def _fetch_use_cases() -> List[str]:
+    # fetch use-cases
+    jwt = TokenManager.getInstance().getToken()
+
+    url = f'https://{network_constants.BUSINESS_LOGIC_HOSTNAME}:{network_constants.BUSINESS_LOGIC_REST_PORT}/api/use-cases'
+
+    response = requests.get(
+            url,
+            verify = False, 
+            proxies = { "http":None, "https":None },
+            headers = {"Authorization": f"Bearer {jwt}"}
+    )
+
+    if response.status_code != 200:
+        raise ConnectionError(f"Could not fetch data from the server, statuscode: {response.status_code}!")
+
+    data = json.loads(response.text)
+
+    return [row["name"] for row in data]
+
+def fetch_nodes_from_semantic_linking():
+    use_cases = _fetch_use_cases()
+
+    for use_case in use_cases:
+        # prune DB 
+        repository = Repository()
+        repository.delete_all_layers()
+        repository.delete_all_nodes()
 
-    layers = _fetch_layers(use_case)
+        layers = _fetch_layers(use_case)
 
-    for layer in layers:
-        # check if layer already exists in DB, add it if not
-        reference_layer = repository.get_layer_for_use_case(layer.layer_name, use_case)
-        if reference_layer == None:
-            repository.add_layer(layer)
+        for layer in layers:
+            # check if layer already exists in DB, add it if not
+            reference_layer = repository.get_layer_for_use_case(layer.layer_name, use_case)
+            if reference_layer == None:
+                repository.add_layer(layer)
 
-        nodes = repository.get_layer_nodes(layer.layer_name)
-        nodes = _fetch_nodes(use_case, layer)
+            nodes = repository.get_layer_nodes(layer.layer_name)
+            nodes = _fetch_nodes(use_case, layer)
 
-        for node in nodes:
-            repository.add_layer_node(node)
\ No newline at end of file
+            for node in nodes:
+                repository.add_layer_node(node)
\ No newline at end of file

src/data-hub/role-stage-discovery-microservice/app/run_node_fetching.py

@@ -10,4 +10,4 @@ import processing.fetching.fetching as f
 
 if __name__ == "__main__":
     # TODO read use_case from somewhere
-    f.fetch_nodes_from_semantic_linking("smart-energy")
\ No newline at end of file
+    f.fetch_nodes_from_semantic_linking()
\ No newline at end of file