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dependencies.py
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dependencies.py
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# -*- coding: utf-8 -*-
"""Helper to check for availability and version of dependencies."""
from __future__ import print_function
from __future__ import unicode_literals
import re
try:
import ConfigParser as configparser
except ImportError:
import configparser # pylint: disable=import-error
class DependencyDefinition(object):
"""Dependency definition.
Attributes:
dpkg_name (str): name of the dpkg package that provides the dependency.
is_optional (bool): True if the dependency is optional.
l2tbinaries_name (str): name of the l2tbinaries package that provides
the dependency.
maximum_version (str): maximum supported version.
minimum_version (str): minimum supported version.
name (str): name of (the Python module that provides) the dependency.
pypi_name (str): name of the PyPI package that provides the dependency.
python2_only (bool): True if the dependency is only supported by Python 2.
rpm_name (str): name of the rpm package that provides the dependency.
version_property (str): name of the version attribute or function.
"""
def __init__(self, name):
"""Initializes a dependency configuration.
Args:
name (str): name of the dependency.
"""
super(DependencyDefinition, self).__init__()
self.dpkg_name = None
self.is_optional = False
self.l2tbinaries_name = None
self.maximum_version = None
self.minimum_version = None
self.name = name
self.pypi_name = None
self.python2_only = False
self.rpm_name = None
self.version_property = None
class DependencyDefinitionReader(object):
"""Dependency definition reader."""
_VALUE_NAMES = frozenset([
'dpkg_name',
'is_optional',
'l2tbinaries_name',
'maximum_version',
'minimum_version',
'pypi_name',
'python2_only',
'rpm_name',
'version_property'])
def _GetConfigValue(self, config_parser, section_name, value_name):
"""Retrieves a value from the config parser.
Args:
config_parser (ConfigParser): configuration parser.
section_name (str): name of the section that contains the value.
value_name (str): name of the value.
Returns:
object: configuration value or None if the value does not exists.
"""
try:
return config_parser.get(section_name, value_name)
except configparser.NoOptionError:
return None
def Read(self, file_object):
"""Reads dependency definitions.
Args:
file_object (file): file-like object to read from.
Yields:
DependencyDefinition: dependency definition.
"""
config_parser = configparser.RawConfigParser()
# pylint: disable=deprecated-method
# TODO: replace readfp by read_file, check if Python 2 compatible
config_parser.readfp(file_object)
for section_name in config_parser.sections():
dependency_definition = DependencyDefinition(section_name)
for value_name in self._VALUE_NAMES:
value = self._GetConfigValue(config_parser, section_name, value_name)
setattr(dependency_definition, value_name, value)
yield dependency_definition
class DependencyHelper(object):
"""Dependency helper.
Attributes:
dependencies (dict[str, DependencyDefinition]): dependencies.
"""
_VERSION_NUMBERS_REGEX = re.compile(r'[0-9.]+')
_VERSION_SPLIT_REGEX = re.compile(r'\.|\-')
def __init__(self, configuration_file='dependencies.ini'):
"""Initializes a dependency helper.
Args:
configuration_file (Optional[str]): path to the dependencies
configuration file.
"""
super(DependencyHelper, self).__init__()
self._test_dependencies = {}
self.dependencies = {}
dependency_reader = DependencyDefinitionReader()
with open(configuration_file, 'r') as file_object:
for dependency in dependency_reader.Read(file_object):
self.dependencies[dependency.name] = dependency
dependency = DependencyDefinition('mock')
dependency.minimum_version = '0.7.1'
dependency.version_property = '__version__'
self._test_dependencies['mock'] = dependency
def _CheckPythonModule(self, dependency):
"""Checks the availability of a Python module.
Args:
dependency (DependencyDefinition): dependency definition.
Returns:
tuple: consists:
bool: True if the Python module is available and conforms to
the minimum required version, False otherwise.
str: status message.
"""
module_object = self._ImportPythonModule(dependency.name)
if not module_object:
status_message = 'missing: {0:s}'.format(dependency.name)
return False, status_message
if not dependency.version_property:
return True, dependency.name
return self._CheckPythonModuleVersion(
dependency.name, module_object, dependency.version_property,
dependency.minimum_version, dependency.maximum_version)
def _CheckPythonModuleVersion(
self, module_name, module_object, version_property, minimum_version,
maximum_version):
"""Checks the version of a Python module.
Args:
module_object (module): Python module.
module_name (str): name of the Python module.
version_property (str): version attribute or function.
minimum_version (str): minimum version.
maximum_version (str): maximum version.
Returns:
tuple: consists:
bool: True if the Python module is available and conforms to
the minimum required version, False otherwise.
str: status message.
"""
module_version = None
if not version_property.endswith('()'):
module_version = getattr(module_object, version_property, None)
else:
version_method = getattr(
module_object, version_property[:-2], None)
if version_method:
module_version = version_method()
if not module_version:
status_message = (
'unable to determine version information for: {0:s}').format(
module_name)
return False, status_message
# Make sure the module version is a string.
module_version = '{0!s}'.format(module_version)
# Split the version string and convert every digit into an integer.
# A string compare of both version strings will yield an incorrect result.
# Strip any semantic suffixes such as a1, b1, pre, post, rc, dev.
module_version = self._VERSION_NUMBERS_REGEX.findall(module_version)[0]
if module_version[-1] == '.':
module_version = module_version[:-1]
try:
module_version_map = list(
map(int, self._VERSION_SPLIT_REGEX.split(module_version)))
except ValueError:
status_message = 'unable to parse module version: {0:s} {1:s}'.format(
module_name, module_version)
return False, status_message
if minimum_version:
try:
minimum_version_map = list(
map(int, self._VERSION_SPLIT_REGEX.split(minimum_version)))
except ValueError:
status_message = 'unable to parse minimum version: {0:s} {1:s}'.format(
module_name, minimum_version)
return False, status_message
if module_version_map < minimum_version_map:
status_message = (
'{0:s} version: {1!s} is too old, {2!s} or later required').format(
module_name, module_version, minimum_version)
return False, status_message
if maximum_version:
try:
maximum_version_map = list(
map(int, self._VERSION_SPLIT_REGEX.split(maximum_version)))
except ValueError:
status_message = 'unable to parse maximum version: {0:s} {1:s}'.format(
module_name, maximum_version)
return False, status_message
if module_version_map > maximum_version_map:
status_message = (
'{0:s} version: {1!s} is too recent, {2!s} or earlier '
'required').format(module_name, module_version, maximum_version)
return False, status_message
status_message = '{0:s} version: {1!s}'.format(module_name, module_version)
return True, status_message
def _CheckSQLite3(self):
"""Checks the availability of sqlite3.
Returns:
tuple: consists:
bool: True if the Python module is available and conforms to
the minimum required version, False otherwise.
str: status message.
"""
# On Windows sqlite3 can be provided by both pysqlite2.dbapi2 and
# sqlite3. sqlite3 is provided with the Python installation and
# pysqlite2.dbapi2 by the pysqlite2 Python module. Typically
# pysqlite2.dbapi2 would contain a newer version of sqlite3, hence
# we check for its presence first.
module_name = 'pysqlite2.dbapi2'
minimum_version = '3.7.8'
module_object = self._ImportPythonModule(module_name)
if not module_object:
module_name = 'sqlite3'
module_object = self._ImportPythonModule(module_name)
if not module_object:
status_message = 'missing: {0:s}.'.format(module_name)
return False, status_message
return self._CheckPythonModuleVersion(
module_name, module_object, 'sqlite_version', minimum_version, None)
def _ImportPythonModule(self, module_name):
"""Imports a Python module.
Args:
module_name (str): name of the module.
Returns:
module: Python module or None if the module cannot be imported.
"""
try:
module_object = list(map(__import__, [module_name]))[0]
except ImportError:
return None
# If the module name contains dots get the upper most module object.
if '.' in module_name:
for submodule_name in module_name.split('.')[1:]:
module_object = getattr(module_object, submodule_name, None)
return module_object
def _PrintCheckDependencyStatus(
self, dependency, result, status_message, verbose_output=True):
"""Prints the check dependency status.
Args:
dependency (DependencyDefinition): dependency definition.
result (bool): True if the Python module is available and conforms to
the minimum required version, False otherwise.
status_message (str): status message.
"""
if not result or dependency.is_optional:
if dependency.is_optional:
status_indicator = '[OPTIONAL]'
else:
status_indicator = '[FAILURE]'
print('{0:s}\t{1:s}'.format(status_indicator, status_message))
elif verbose_output:
print('[OK]\t\t{0:s}'.format(status_message))
def CheckDependencies(self, verbose_output=True):
"""Checks the availability of the dependencies.
Args:
verbose_output (Optional[bool]): True if output should be verbose.
Returns:
bool: True if the dependencies are available, False otherwise.
"""
print('Checking availability and versions of dependencies.')
check_result = True
for module_name, dependency in sorted(self.dependencies.items()):
if module_name == 'sqlite3':
result, status_message = self._CheckSQLite3()
else:
result, status_message = self._CheckPythonModule(dependency)
if not result and module_name == 'lzma':
dependency.name = 'backports.lzma'
result, status_message = self._CheckPythonModule(dependency)
if not result and not dependency.is_optional:
check_result = False
self._PrintCheckDependencyStatus(
dependency, result, status_message, verbose_output=verbose_output)
if check_result and not verbose_output:
print('[OK]')
print('')
return check_result
def CheckTestDependencies(self, verbose_output=True):
"""Checks the availability of the dependencies when running tests.
Args:
verbose_output (Optional[bool]): True if output should be verbose.
Returns:
bool: True if the dependencies are available, False otherwise.
"""
if not self.CheckDependencies(verbose_output=verbose_output):
return False
print('Checking availability and versions of test dependencies.')
check_result = True
for dependency in sorted(
self._test_dependencies.values(),
key=lambda dependency: dependency.name):
result, status_message = self._CheckPythonModule(dependency)
if not result:
check_result = False
self._PrintCheckDependencyStatus(
dependency, result, status_message, verbose_output=verbose_output)
if check_result and not verbose_output:
print('[OK]')
print('')
return check_result