Change: speed-up startup by using C-powered YAML loader (#403)

The C-powered loader is about 6 times faster, and makes the startup
go from ~30s to ~5s.

bananas_api/index/common_disk.py

@@ -79,7 +79,7 @@ def __init__(self, folder):
 
     def read_content_version(self, path, version, load_as_object=False):
         with open(f"{self.folder}/{path}/versions/{version}.yaml") as f:
-            version_data = yaml.safe_load(f.read())
+            version_data = yaml.load(f.read(), Loader=yaml.CSafeLoader)
 
             # YAML converts this in a datetime() for us, and marshmallow
             # expects a string. So output it as an ISO-8601 again.
@@ -99,14 +99,14 @@ def _read_content_entry(self, content_type, category, unique_id):
         path = f"{category}/{unique_id}"
 
         with open(f"{self.folder}/{path}/global.yaml") as f:
-            package_data = yaml.safe_load(f.read())
+            package_data = yaml.load(f.read(), Loader=yaml.CSafeLoader)
 
         if package_data.get("blacklisted"):
             return None
 
         package_data["authors"] = []
         with open(f"{self.folder}/{path}/authors.yaml") as f:
-            authors_data = yaml.safe_load(f.read())
+            authors_data = yaml.load(f.read(), Loader=yaml.CSafeLoader)
 
             for author_data in authors_data.get("authors", []):
                 package_data["authors"].append(author_data)

bananas_api/tool_reclassify/reclassify.py

@@ -25,7 +25,7 @@ def reclassify_and_update_metadata(index_folder, storage_folder, category, uniqu
 
     # Load the global data to find things like the name.
     with open(f"{index_folder}/{category}/{unique_id}/global.yaml") as f:
-        global_data = yaml.safe_load(f.read())
+        global_data = yaml.load(f.read(), Loader=yaml.CSafeLoader)
 
     name = data.get("name", global_data.get("name", "Unknown"))
 

bananas_api/web_routes/user.py

@@ -39,7 +39,7 @@ def click_client_file(client_file):
         return
 
     with open(client_file, "r") as fp:
-        data = yaml.safe_load(fp.read())
+        data = yaml.load(fp.read(), Loader=yaml.CSafeLoader)
 
         for client in data["clients"]:
             _clients[client["id"]] = client["redirect-uri"]

regression_runner/__main__.py

@@ -504,7 +504,7 @@ async def _handle_files(filenames):
 
         try:
             with open(filename, "r") as f:
-                data = yaml.safe_load(f)
+                data = yaml.load(f, Loader=yaml.CSafeLoader)
 
             await _handle_file(data)
             log.success("Regression test passed")