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from utils.metadata_parser import MetadataParser
from utils.util import ClassResolver
class FindLinksMetadataParser(MetadataParser):
FINDERS_FILE = "link_finders.json"
FINDERS_PACKAGE = "finders_package"
BASE_FINDER = "base_finder"
LINK_FINDERS = "link_finders"
def __init__(self):
super().__init__()
self.finders_package = None
self.base_finder = None
self.link_finders = []
def validate_link_finder(self, finder_class):
try:
module_name = ClassResolver.get_module_file_by_class_name(finder_class)
instance = ClassResolver\
.get_instance_of_class(package_name=self.finders_package,
module_name=module_name,
class_name=finder_class)
except ValueError:
instance = None
if instance:
self.link_finders.append(instance)
else:
self.add_error('Failed to import link finder class "{}"'
.format(finder_class))
def validate_metadata(self, metadata: dict):
super().validate_metadata(metadata)
self.finders_package = metadata[self.FINDERS_PACKAGE]
self.base_finder = metadata[self.BASE_FINDER]
base_finder_module = ClassResolver\
.get_module_file_by_class_name(self.base_finder)
base_finder_class = ClassResolver.get_class_name_by_module(
".".join((self.finders_package, base_finder_module)))
if not base_finder_class:
self.add_error("Couldn't find base link finder class")
return
for link_finder in metadata[self.LINK_FINDERS]:
self.validate_link_finder(finder_class=link_finder)
metadata[self.LINK_FINDERS] = self.link_finders
return len(self.errors) == 0
def get_required_fields(self) -> list:
return [self.FINDERS_PACKAGE, self.BASE_FINDER, self.LINK_FINDERS]
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