Basic task queue framework

eos/base/tests.py

@@ -23,8 +23,7 @@ from eos.core.objects import *
 class ElectionTestCase(EosTestCase):
 	@classmethod
 	def setUpClass(cls):
-		db_connect('test')
+		cls.db_connect_and_reset()
-		dbinfo.provider.reset_db()
 	
 	def do_task_assert(self, election, task, next_task):
 		self.assertEqual(election.workflow.get_task(task).status, WorkflowTask.Status.READY)

eos/core/db/__init__.py

@@ -20,3 +20,36 @@ class DBProvider:
 	def __init__(self, db_name, db_uri):
 		self.db_name = db_name
 		self.db_uri = db_uri
+	
+	def connect(self):
+		raise Exception('Not implemented')
+	
+	def get_all(self, collection):
+		raise Exception('Not implemented')
+	
+	def get_by_id(self, collection, _id):
+		raise Exception('Not implemented')
+	
+	def update_by_id(self, collection, _id, value):
+		raise Exception('Not implemented')
+	
+	def reset_db(self):
+		raise Exception('Not implemented')
+
+class DummyProvider(DBProvider):
+	def connect(self):
+		pass
+	
+	def get_all(self, collection):
+		pass
+	
+	def get_by_id(self, collection, _id):
+		pass
+	
+	def update_by_id(self, collection, _id, value):
+		pass
+	
+	def reset_db(self):
+		pass
+
+db_providers['dummy'] = DummyProvider

eos/core/objects/__init__.py

@@ -25,9 +25,10 @@ except:
 # Libraries
 # =========
 
+import eos.core.db
+
 if is_python:
 	__pragma__('skip')
-	import eos.core.db
 	import eos.core.db.mongodb
 	import eos.core.db.postgresql
 	
@@ -54,7 +55,7 @@ else:
 
 class DBInfo:
 	def __init__(self):
-		self.provider = None
+		self.provider = eos.core.db.DummyProvider(None, None)
 
 dbinfo = DBInfo()
 

eos/core/tasks/__init__.py

@@ -0,0 +1,63 @@
+#   Eos - Verifiable elections
+#   Copyright © 2017  RunasSudo (Yingtong Li)
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU Affero General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU Affero General Public License for more details.
+#
+#   You should have received a copy of the GNU Affero General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from eos.core.objects import *
+
+class Task(TopLevelObject):
+	class Status:
+		UNKNOWN = 0
+		
+		READY = 20
+		PROCESSING = 30
+		COMPLETE = 50
+		
+		FAILED = -10
+		TIMEOUT = -20
+	
+	_id = UUIDField()
+	status = IntField(default=0)
+	run_strategy = EmbeddedObjectField()
+	messages = ListField(StringField())
+	
+	def run(self):
+		self.run_strategy.run(self)
+	
+	def _run(self):
+		pass
+
+class RunStrategy(DocumentObject):
+	def run(self, task):
+		raise Exception('Not implemented')
+
+class DirectRunStrategy(RunStrategy):
+	def run(self, task):
+		task.status = Task.Status.PROCESSING
+		task.save()
+		
+		try:
+			task._run()
+			task.status = Task.Status.COMPLETE
+			task.save()
+		except Exception as e:
+			task.status = Task.Status.FAILED
+			if is_python:
+				#__pragma__('skip')
+				import traceback
+				#__pragma__('noskip')
+				task.messages.append(traceback.format_exc())
+			else:
+				task.messages.append(repr(e))
+			task.save()

eos/core/tasks/direct.py

@@ -0,0 +1,19 @@
+#   Eos - Verifiable elections
+#   Copyright © 2017  RunasSudo (Yingtong Li)
+#
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU Affero General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU Affero General Public License for more details.
+#
+#   You should have received a copy of the GNU Affero General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from eos.core.tasks import *
+
+

eos/core/tests.py

@@ -17,6 +17,7 @@
 from eos.core.bigint import *
 from eos.core.objects import *
 from eos.core.hashing import *
+from eos.core.tasks import *
 
 # Common library things
 # ===================
@@ -26,6 +27,11 @@ class EosTestCase:
 	def setUpClass(cls):
 		pass
 	
+	@classmethod
+	def db_connect_and_reset(cls):
+		db_connect('test')
+		dbinfo.provider.reset_db()
+	
 	def assertTrue(self, a):
 		if is_python:
 			self.impl.assertTrue(a)
@@ -120,3 +126,37 @@ class BigIntTestCase(EosTestCase):
 		self.assertEqual(pow(bigint1, bigint2), 5**10)
 		self.assertEqual(pow(bigint1, bigint2, bigint3), (5**10)%15)
 		self.assertEqual(pow(bigint1, 10, 15), (5**10)%15)
+
+class TaskTestCase(EosTestCase):
+	@classmethod
+	def setUpClass(cls):
+		cls.db_connect_and_reset()
+	
+	def test_normal(self):
+		class TaskNormal(Task):
+			result = StringField()
+			def _run(self):
+				self.messages.append('Hello World')
+				self.result = 'Success'
+		
+		task = TaskNormal(run_strategy=DirectRunStrategy())
+		task.save()
+		task.run()
+		
+		self.assertEqual(task.status, Task.Status.COMPLETE)
+		self.assertEqual(len(task.messages), 1)
+		self.assertEqual(task.messages[0], 'Hello World')
+		self.assertEqual(task.result, 'Success')
+	
+	def test_error(self):
+		class TaskError(Task):
+			def _run(self):
+				raise Exception('Test exception')
+		
+		task = TaskError(run_strategy=DirectRunStrategy())
+		task.save()
+		task.run()
+		
+		self.assertEqual(task.status, Task.Status.FAILED)
+		self.assertEqual(len(task.messages), 1)
+		self.assertTrue('Test exception' in task.messages[0])

eos/psr/tests.py

@@ -216,8 +216,7 @@ class MixnetTestCase(EosTestCase):
 class ElectionTestCase(EosTestCase):
 	@classmethod
 	def setUpClass(cls):
-		db_connect('test')
+		cls.db_connect_and_reset()
-		dbinfo.provider.reset_db()
 	
 	def do_task_assert(self, election, task, next_task):
 		self.assertEqual(election.workflow.get_task(task).status, WorkflowTask.Status.READY)