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test_extension_loader.py
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test_extension_loader.py
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# coding=utf-8
# Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
# Licensed under the Apache License, Version 2.0 (see LICENSE).
from __future__ import (absolute_import, division, generators, nested_scopes, print_function,
unicode_literals, with_statement)
import sys
import types
import unittest
import uuid
from contextlib import contextmanager
from pkg_resources import (Distribution, EmptyProvider, VersionConflict, WorkingSet, working_set,
yield_lines)
from pants.base.exceptions import BuildConfigurationError
from pants.build_graph.build_configuration import BuildConfiguration
from pants.build_graph.build_file_aliases import BuildFileAliases
from pants.build_graph.target import Target
from pants.engine.rules import RootRule, rule
from pants.engine.selectors import Select
from pants.goal.goal import Goal
from pants.goal.task_registrar import TaskRegistrar
from pants.init.extension_loader import (PluginLoadOrderError, PluginNotFound, load_backend,
load_backends_and_plugins, load_plugins)
from pants.subsystem.subsystem import Subsystem
from pants.task.task import Task
from pants.util.objects import datatype
class MockMetadata(EmptyProvider):
def __init__(self, metadata):
self.metadata = metadata
def has_metadata(self, name):
return name in self.metadata
def get_metadata(self, name):
return self.metadata[name]
def get_metadata_lines(self, name):
return yield_lines(self.get_metadata(name))
class DummySubsystem1(Subsystem):
options_scope = 'dummy-subsystem1'
class DummySubsystem2(Subsystem):
options_scope = 'dummy-subsystem2'
class DummyTarget(Target):
@classmethod
def subsystems(cls):
return (DummySubsystem1,)
class DummyTarget2(Target):
@classmethod
def subsystems(cls):
return (DummySubsystem2,)
class DummyObject1(object):
# Test that registering an object with no subsystems() method succeeds.
pass
class DummyObject2(object):
@classmethod
def subsystems(cls):
return (DummySubsystem2,)
class DummyTask(Task):
def execute(self): return 42
class RootType(datatype('RootType', ['value'])):
pass
class WrapperType(datatype('WrapperType', ['value'])):
pass
@rule(WrapperType, [Select(RootType)])
def example_rule(root_type):
yield WrapperType(root_type.value)
class LoaderTest(unittest.TestCase):
def setUp(self):
self.build_configuration = BuildConfiguration()
self.working_set = WorkingSet()
for entry in working_set.entries:
self.working_set.add_entry(entry)
def tearDown(self):
Goal.clear()
@contextmanager
def create_register(self, build_file_aliases=None, register_goals=None, global_subsystems=None,
rules=None, module_name='register'):
package_name = b'__test_package_{0}'.format(uuid.uuid4().hex)
self.assertFalse(package_name in sys.modules)
package_module = types.ModuleType(package_name)
sys.modules[package_name] = package_module
try:
register_module_fqn = b'{0}.{1}'.format(package_name, module_name)
register_module = types.ModuleType(register_module_fqn)
setattr(package_module, module_name, register_module)
sys.modules[register_module_fqn] = register_module
def register_entrypoint(function_name, function):
if function:
setattr(register_module, function_name, function)
register_entrypoint('build_file_aliases', build_file_aliases)
register_entrypoint('global_subsystems', global_subsystems)
register_entrypoint('register_goals', register_goals)
register_entrypoint('rules', rules)
yield package_name
finally:
del sys.modules[package_name]
def assert_empty_aliases(self):
registered_aliases = self.build_configuration.registered_aliases()
self.assertEqual(0, len(registered_aliases.target_types))
self.assertEqual(0, len(registered_aliases.target_macro_factories))
self.assertEqual(0, len(registered_aliases.objects))
self.assertEqual(0, len(registered_aliases.context_aware_object_factories))
self.assertEqual(self.build_configuration.subsystems(), set())
self.assertEqual(0, len(self.build_configuration.rules()))
def test_load_valid_empty(self):
with self.create_register() as backend_package:
load_backend(self.build_configuration, backend_package)
self.assert_empty_aliases()
def test_load_valid_partial_aliases(self):
aliases = BuildFileAliases(targets={'bob': DummyTarget},
objects={'obj1': DummyObject1,
'obj2': DummyObject2})
with self.create_register(build_file_aliases=lambda: aliases) as backend_package:
load_backend(self.build_configuration, backend_package)
registered_aliases = self.build_configuration.registered_aliases()
self.assertEqual(DummyTarget, registered_aliases.target_types['bob'])
self.assertEqual(DummyObject1, registered_aliases.objects['obj1'])
self.assertEqual(DummyObject2, registered_aliases.objects['obj2'])
self.assertEqual(self.build_configuration.subsystems(), {DummySubsystem1, DummySubsystem2})
def test_load_valid_partial_goals(self):
def register_goals():
Goal.by_name('jack').install(TaskRegistrar('jill', DummyTask))
with self.create_register(register_goals=register_goals) as backend_package:
Goal.clear()
self.assertEqual(0, len(Goal.all()))
load_backend(self.build_configuration, backend_package)
self.assert_empty_aliases()
self.assertEqual(1, len(Goal.all()))
task_names = Goal.by_name('jack').ordered_task_names()
self.assertEqual(1, len(task_names))
task_name = task_names[0]
self.assertEqual('jill', task_name)
def test_load_invalid_entrypoint(self):
def build_file_aliases(bad_arg):
return BuildFileAliases()
with self.create_register(build_file_aliases=build_file_aliases) as backend_package:
with self.assertRaises(BuildConfigurationError):
load_backend(self.build_configuration, backend_package)
def test_load_invalid_module(self):
with self.create_register(module_name='register2') as backend_package:
with self.assertRaises(BuildConfigurationError):
load_backend(self.build_configuration, backend_package)
def test_load_missing_plugin(self):
with self.assertRaises(PluginNotFound):
self.load_plugins(['Foobar'])
def get_mock_plugin(self, name, version, reg=None, alias=None, after=None):
"""Make a fake Distribution (optionally with entry points)
Note the entry points do not actually point to code in the returned distribution --
the distribution does not even have a location and does not contain any code, just metadata.
A module is synthesized on the fly and installed into sys.modules under a random name.
If optional entry point callables are provided, those are added as methods to the module and
their name (foo/bar/baz in fake module) is added as the requested entry point to the mocked
metadata added to the returned dist.
:param string name: project_name for distribution (see pkg_resources)
:param string version: version for distribution (see pkg_resources)
:param callable reg: Optional callable for goal registration entry point
:param callable alias: Optional callable for build_file_aliases entry point
:param callable after: Optional callable for load_after list entry point
"""
plugin_pkg = b'demoplugin{0}'.format(uuid.uuid4().hex)
pkg = types.ModuleType(plugin_pkg)
sys.modules[plugin_pkg] = pkg
module_name = b'{0}.{1}'.format(plugin_pkg, 'demo')
plugin = types.ModuleType(module_name)
setattr(pkg, 'demo', plugin)
sys.modules[module_name] = plugin
metadata = {}
entry_lines = []
if reg is not None:
setattr(plugin, 'foo', reg)
entry_lines.append('register_goals = {}:foo\n'.format(module_name))
if alias is not None:
setattr(plugin, 'bar', alias)
entry_lines.append('build_file_aliases = {}:bar\n'.format(module_name))
if after is not None:
setattr(plugin, 'baz', after)
entry_lines.append('load_after = {}:baz\n'.format(module_name))
if entry_lines:
entry_data = '[pantsbuild.plugin]\n{}\n'.format('\n'.join(entry_lines))
metadata = {'entry_points.txt': entry_data}
return Distribution(project_name=name, version=version, metadata=MockMetadata(metadata))
def load_plugins(self, plugins):
load_plugins(self.build_configuration, plugins, self.working_set)
def test_plugin_load_and_order(self):
d1 = self.get_mock_plugin('demo1', '0.0.1', after=lambda: ['demo2'])
d2 = self.get_mock_plugin('demo2', '0.0.3')
self.working_set.add(d1)
# Attempting to load 'demo1' then 'demo2' should fail as 'demo1' requires 'after'=['demo2'].
with self.assertRaises(PluginLoadOrderError):
self.load_plugins(['demo1', 'demo2'])
# Attempting to load 'demo2' first should fail as it is not (yet) installed.
with self.assertRaises(PluginNotFound):
self.load_plugins(['demo2', 'demo1'])
# Installing demo2 and then loading in correct order should work though.
self.working_set.add(d2)
self.load_plugins(['demo2>=0.0.2', 'demo1'])
# But asking for a bad (not installed) version fails.
with self.assertRaises(VersionConflict):
self.load_plugins(['demo2>=0.0.5'])
def test_plugin_installs_goal(self):
def reg_goal():
Goal.by_name('plugindemo').install(TaskRegistrar('foo', DummyTask))
self.working_set.add(self.get_mock_plugin('regdemo', '0.0.1', reg=reg_goal))
# Start without the custom goal.
self.assertEqual(0, len(Goal.by_name('plugindemo').ordered_task_names()))
# Load plugin which registers custom goal.
self.load_plugins(['regdemo'])
# Now the custom goal exists.
self.assertEqual(1, len(Goal.by_name('plugindemo').ordered_task_names()))
self.assertEqual('foo', Goal.by_name('plugindemo').ordered_task_names()[0])
def test_plugin_installs_alias(self):
def reg_alias():
return BuildFileAliases(targets={'pluginalias': DummyTarget},
objects={'FROMPLUGIN1': DummyObject1,
'FROMPLUGIN2': DummyObject2})
self.working_set.add(self.get_mock_plugin('aliasdemo', '0.0.1', alias=reg_alias))
# Start with no aliases.
self.assert_empty_aliases()
# Now load the plugin which defines aliases.
self.load_plugins(['aliasdemo'])
# Aliases now exist.
registered_aliases = self.build_configuration.registered_aliases()
self.assertEqual(DummyTarget, registered_aliases.target_types['pluginalias'])
self.assertEqual(DummyObject1, registered_aliases.objects['FROMPLUGIN1'])
self.assertEqual(DummyObject2, registered_aliases.objects['FROMPLUGIN2'])
self.assertEqual(self.build_configuration.subsystems(), {DummySubsystem1, DummySubsystem2})
def test_subsystems(self):
def global_subsystems():
return {DummySubsystem1, DummySubsystem2}
with self.create_register(global_subsystems=global_subsystems) as backend_package:
load_backend(self.build_configuration, backend_package)
self.assertEqual(self.build_configuration.subsystems(),
{DummySubsystem1, DummySubsystem2})
def test_rules(self):
def rules():
return [example_rule, RootRule(RootType)]
with self.create_register(rules=rules) as backend_package:
load_backend(self.build_configuration, backend_package)
self.assertEqual(self.build_configuration.rules(),
[example_rule, RootRule(RootType)])
def test_backend_plugin_ordering(self):
def reg_alias():
return BuildFileAliases(targets={'override-alias': DummyTarget2})
self.working_set.add(self.get_mock_plugin('pluginalias', '0.0.1', alias=reg_alias))
plugins=['pluginalias==0.0.1']
aliases = BuildFileAliases(targets={'override-alias': DummyTarget})
with self.create_register(build_file_aliases=lambda: aliases) as backend_module:
backends=[backend_module]
load_backends_and_plugins(plugins, self.working_set, backends,
build_configuration=self.build_configuration)
# The backend should load first, then the plugins, therefore the alias registered in
# the plugin will override the alias registered by the backend
registered_aliases = self.build_configuration.registered_aliases()
self.assertEqual(DummyTarget2, registered_aliases.target_types['override-alias'])