Store votes in a separate collection for better concurrency support

eos/base/election.py

@@ -46,8 +46,11 @@ class Ballot(EmbeddedObject):
 		
 		return Ballot(encrypted_answers=encrypted_answers_deaudit, election_id=self.election_id, election_hash=self.election_hash)
 
-class Vote(EmbeddedObject):
-	_ver = StringField(default='0.5')
+class Vote(TopLevelObject):
+	_ver = StringField(default='0.6')
+	
+	_id = UUIDField()
+	voter_id = UUIDField()
 	
 	ballot = EmbeddedObjectField()
 	cast_at = DateTimeField()
@@ -57,8 +60,10 @@ class Vote(EmbeddedObject):
 	cast_fingerprint = BlobField(is_protected=True)
 
 class Voter(EmbeddedObject):
+	_ver = StringField(default='0.6')
+	
 	_id = UUIDField()
-	votes = EmbeddedObjectListField()
+	votes = RelatedObjectListField(related_type=Vote, object_type=None, this_field='_id', related_field='voter_id')
 
 class User(EmbeddedObject):
 	admins = []
@@ -229,7 +234,7 @@ class Election(TopLevelObject):
 		election_hash = SHA256().update_obj(self).hash_as_b64()
 		
 		for voter in self.voters:
-			for vote in voter.votes:
+			for vote in voter.votes.get_all():
 				if vote.ballot.election_id != self._id:
 					raise Exception('Invalid election ID on ballot')
 				if vote.ballot.election_hash != election_hash:

eos/base/tests.py

@@ -95,10 +95,10 @@ class ElectionTestCase(EosTestCase):
 				answer = ApprovalAnswer(choices=VOTES[i][j])
 				encrypted_answer = NullEncryptedAnswer(answer=answer)
 				ballot.encrypted_answers.append(encrypted_answer)
-			vote = Vote(ballot=ballot, cast_at=DateTimeField.now())
-			election.voters[i].votes.append(vote)
+			vote = Vote(voter_id=election.voters[i]._id, ballot=ballot, cast_at=DateTimeField.now())
+			vote.save()
 		
-		election.save()
+		#election.save()
 		
 		# Close voting
 		self.do_task_assert(election, 'eos.base.workflow.TaskCloseVoting', 'eos.base.workflow.TaskDecryptVotes')

eos/base/workflow.py

@@ -167,8 +167,8 @@ class TaskDecryptVotes(WorkflowTask):
 			election.results.append(EosObject.lookup('eos.base.election.RawResult')())
 		
 		for voter in election.voters:
-			if len(voter.votes) > 0:
-				vote = voter.votes[-1]
+			if len(voter.votes.get_all()) > 0:
+				vote = voter.votes.get_all()[-1]
 				ballot = vote.ballot
 				for q_num in range(len(ballot.encrypted_answers)):
 					plaintexts, answer = ballot.encrypted_answers[q_num].decrypt()

eos/core/db/mongodb.py

@@ -33,7 +33,7 @@ class MongoDBProvider(eos.core.db.DBProvider):
 		if 'type' in fields:
 			query['type'] = fields.pop('type')
 		for field in fields:
-			query['value.' + field] = fields.pop(field)
+			query['value.' + field] = fields[field]
 		return self.db[collection].find(query)
 	
 	def get_by_id(self, collection, _id):

eos/core/objects/__init__.py

@@ -85,6 +85,9 @@ class Field:
 			value._instance = (obj, self.real_name)
 			if not value._inited:
 				value.post_init()
+	
+	def object_init(self, obj, value):
+		self.object_set(obj, value)
 
 class SerialiseOptions:
 	def __init__(self, for_hash=False, should_protect=False, combine_related=False):
@@ -152,14 +155,15 @@ class RelatedObjectListManager:
 	
 	def get_all(self):
 		query = {self.field.related_field: getattr(self.obj, self.field.this_field)}
-		return self.field.object_type.get_all_by_fields(**query)
+		return self.field.related_type.get_all_by_fields(**query)
 
 class RelatedObjectListField(Field):
 	def __init__(self, object_type=None, *args, **kwargs):
 		super().__init__(*args, **kwargs)
-		self.object_type = object_type
-		self.this_field = args['this_field'] if 'this_field' in args else '_id'
-		self.related_field = args['related_field'] if 'related_field' in args else 'related_id'
+		self.related_type = kwargs['related_type']
+		self.object_type = kwargs['object_type'] if 'object_type' in kwargs else None
+		self.this_field = kwargs['this_field'] if 'this_field' in kwargs else '_id'
+		self.related_field = kwargs['related_field']
 	
 	def object_get(self, obj):
 		return RelatedObjectListManager(self, obj)
@@ -167,6 +171,9 @@ class RelatedObjectListField(Field):
 	def object_set(self, obj, value):
 		raise Exception('Cannot directly set related field')
 	
+	def object_init(self, obj, value):
+		pass
+	
 	def serialise(self, value, options=SerialiseOptions.DEFAULT):
 		if not options.combine_related:
 			return None
@@ -174,7 +181,7 @@ class RelatedObjectListField(Field):
 	
 	def deserialise(self, value):
 		if value is None:
-			return self.get_manager()
+			return None
 		return EosList([EosObject.deserialise_and_unwrap(x, self.object_type) for x in value])
 
 if is_python:
@@ -270,8 +277,9 @@ class EosObject(metaclass=EosObjectType):
 		if object_type:
 			if value:
 				return value.serialise(options)
-			return None
-		return {'type': value._name, 'value': (value.serialise(options) if value else None)}
+		if value:
+			return {'type': value._name, 'value': (value.serialise(options) if value else None)}
+		return None
 	
 	@staticmethod
 	def deserialise_and_unwrap(value, object_type=None):
@@ -428,12 +436,12 @@ class DocumentObject(EosObject, metaclass=DocumentObjectType):
 					})
 			
 			if val.internal_name in kwargs:
-				setattr(self, val.real_name, kwargs[val.internal_name])
+				val.object_init(self, kwargs[val.internal_name])
 			else:
 				default = val.default
 				if default is not None and callable(default):
 					default = default()
-				setattr(self, val.real_name, default)
+				val.object_init(self, default)
 	
 	def serialise(self, options=SerialiseOptions.DEFAULT):
 		return {val.real_name: val.serialise(getattr(self, val.real_name), options) for attr, val in self._fields.items() if ((val.is_hashed or not options.for_hash) and (not options.should_protect or not val.is_protected))}
@@ -479,6 +487,9 @@ class TopLevelObject(DocumentObject, metaclass=TopLevelObjectType):
 	
 	@classmethod
 	def get_all_by_fields(cls, **fields):
+		for field in fields:
+			if not isinstance(fields[field], str):
+				fields[field] = str(fields[field])
 		return [EosObject.deserialise_and_unwrap(x) for x in dbinfo.provider.get_all_by_fields(cls._db_name, fields)]
 	
 	@classmethod

eos/psr/election.py

@@ -96,8 +96,8 @@ class MixingTrustee(Trustee):
 			# Use the raw ballots from voters
 			orig_answers = []
 			for voter in self.recurse_parents(Election).voters:
-				if len(voter.votes) > 0:
-					vote = voter.votes[-1]
+				if len(voter.votes.get_all()) > 0:
+					vote = voter.votes.get_all()[-1]
 					ballot = vote.ballot
 					orig_answers.append(ballot.encrypted_answers[question_num])
 			return orig_answers
@@ -195,8 +195,8 @@ class InternalMixingTrustee(MixingTrustee):
 		else:
 			orig_answers = []
 			for voter in election.voters:
-				if len(voter.votes) > 0:
-					ballot = voter.votes[-1].ballot
+				if len(voter.votes.get_all()) > 0:
+					ballot = voter.votes.get_all()[-1].ballot
 					orig_answers.append(ballot.encrypted_answers[question])
 		shuffled_answers, commitments = self.mixnets[question].shuffle(orig_answers)
 		self.mixed_questions.append(EosList(shuffled_answers))

eos/psr/tests.py

@@ -278,10 +278,10 @@ class ElectionTestCase(EosTestCase):
 				answer = ApprovalAnswer(choices=VOTES[i][j])
 				encrypted_answer = BlockEncryptedAnswer.encrypt(election.sk.public_key, answer)
 				ballot.encrypted_answers.append(encrypted_answer)
-			vote = Vote(ballot=ballot, cast_at=DateTimeField.now())
-			election.voters[i].votes.append(vote)
+			vote = Vote(voter_id=election.voters[i]._id, ballot=ballot, cast_at=DateTimeField.now())
+			vote.save()
 		
-		election.save()
+		#election.save()
 		
 		# Close voting
 		self.do_task_assert(election, 'eos.base.workflow.TaskCloseVoting', 'eos.psr.workflow.TaskMixVotes')

eosweb/core/main.py

@@ -311,7 +311,7 @@ def election_api_cast_vote(election):
 	
 	# Cast the vote
 	ballot = EosObject.deserialise_and_unwrap(data['ballot'])
-	vote = Vote(ballot=ballot, cast_at=DateTimeField.now())
+	vote = Vote(voter_id=voter._id, ballot=ballot, cast_at=DateTimeField.now())
 	
 	# Store data
 	if app.config['CAST_FINGERPRINT']:
@@ -322,9 +322,7 @@ def election_api_cast_vote(election):
 		else:
 			vote.cast_ip = flask.request.remote_addr
 	
-	voter.votes.append(vote)
-	
-	election.save()
+	vote.save()
 	
 	return flask.Response(json.dumps({
 		'voter': EosObject.serialise_and_wrap(voter, None, SerialiseOptions(should_protect=True)),

eosweb/core/templates/election/view/ballots.html

@@ -30,8 +30,9 @@
 			{% for voter in election.voters %}
 				<tr>
 					<td>{{ voter.name }}</td>
-					{% if voter.votes|length > 0 %}
-						<td class="hash">{{ SHA256().update_obj(voter.votes[-1].ballot).hash_as_b64() }}</td>
+					{% set votes = voter.votes.get_all() %}
+					{% if votes|length > 0 %}
+						<td class="hash">{{ SHA256().update_obj(votes[-1].ballot).hash_as_b64() }}</td>
 					{% else %}
 						<td class="hash"></td>
 					{% endif %}