Resolve "Plug-and-play metainfo not working on v1.1.0"

nomad/app/main.py

@@ -68,6 +68,9 @@ app.mount(app_base, WSGIMiddleware(flask_app))
 
 @app.on_event('startup')
 async def startup_event():
+    from nomad.parsing.parsers import import_all_parsers
+    import_all_parsers()
+
     from nomad import infrastructure
     # each subprocess is supposed disconnect connect again: https://jira.mongodb.org/browse/PYTHON-2090
     try:

nomad/cli/dev.py

@@ -77,8 +77,8 @@ def _all_metainfo_packages():
 
     # TODO similar to before, due to lazyloading, we need to explicily access parsers
     # to actually import all parsers and indirectly all metainfo packages
-    from nomad.parsing import parsers
-    parsers.parsers
+    from nomad.parsing.parsers import import_all_parsers
+    import_all_parsers()
 
     # Create the ES mapping to populate ES annoations with search keys.
     from nomad.search import entry_type

nomad/parsing/parser.py

@@ -237,18 +237,27 @@ class MatchingParserInterface(MatchingParser):
     def mainfile_parser(self):
         if self._mainfile_parser is None:
             try:
-                module_path, parser_class = self._parser_class_name.rsplit('.', 1)
-                module = importlib.import_module(module_path)
-                self._mainfile_parser = getattr(module, parser_class)()
+                Parser = self.import_parser_class()
+                self._mainfile_parser = Parser()
             except Exception as e:
                 logger = utils.get_logger(__name__)
-                logger.error('Error importing parser.', exc_info=e)
+                logger.error('cannot instantiate parser.', exc_info=e)
                 raise e
         return self._mainfile_parser
 
     def parse(self, mainfile: str, archive: EntryArchive, logger=None):
         self.mainfile_parser.parse(mainfile, archive, logger)
 
+    def import_parser_class(self):
+        try:
+            module_path, parser_class = self._parser_class_name.rsplit('.', 1)
+            module = importlib.import_module(module_path)
+            return getattr(module, parser_class)
+        except Exception as e:
+            logger = utils.get_logger(__name__)
+            logger.error('cannot import parser', exc_info=e)
+            raise e
+
 
 class ArchiveParser(MatchingParser):
     def __init__(self):

nomad/parsing/parsers.py

@@ -545,3 +545,13 @@ for parser in parsers:
 code_names = sorted(set(code_names), key=lambda code_name: code_name.lower())
 results.Simulation.program_name.a_elasticsearch[0].values = code_names + [
     config.services.unavailable_value, config.services.not_processed_value]
+
+
+def import_all_parsers():
+    '''
+    Imports all the parsers. This will instantiate all parser metainfo as a side
+    effect.
+    '''
+    for parser in parsers:
+        if isinstance(parser, MatchingParserInterface):
+            parser.import_parser_class()