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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."""
import configparser
import os
import re
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, a greater or equal
version is not supported.
minimum_version (str): minimum supported version, a lesser version is
not supported.
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.
python3_only (bool): True if the dependency is only supported by Python 3.
rpm_name (str): name of the rpm package that provides the dependency.
skip_check (bool): True if the dependency should be skipped by the
CheckDependencies or CheckTestDependencies methods of DependencyHelper.
skip_requires (bool): True if the dependency should be excluded from
requirements.txt or setup.py install_requires.
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.python3_only = False
self.rpm_name = None
self.skip_check = None
self.skip_requires = 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',
'python3_only',
'rpm_name',
'skip_check',
'skip_requires',
'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.ConfigParser(interpolation=None)
config_parser.read_file(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, dependencies_file='dependencies.ini',
test_dependencies_file='test_dependencies.ini'):
"""Initializes a dependency helper.
Args:
dependencies_file (Optional[str]): path to the dependencies configuration
file.
test_dependencies_file (Optional[str]): path to the test dependencies
configuration file.
"""
super(DependencyHelper, self).__init__()
self._test_dependencies = {}
self.dependencies = {}
dependency_reader = DependencyDefinitionReader()
with open(dependencies_file, 'r', encoding='utf-8') as file_object:
for dependency in dependency_reader.Read(file_object):
self.dependencies[dependency.name] = dependency
if os.path.exists(test_dependencies_file):
with open(test_dependencies_file, 'r', encoding='utf-8') as file_object:
for dependency in dependency_reader.Read(file_object):
self._test_dependencies[dependency.name] = dependency
def _CheckPythonModule(self, dependency):
"""Checks the availability of a Python module.
Args:
dependency (DependencyDefinition): dependency definition.
Returns:
tuple: containing:
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:
return False, f'missing: {dependency.name:s}'
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: containing:
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:
return False, (
f'unable to determine version information for: {module_name:s}')
# Make sure the module version is a string.
module_version = f'{module_version!s}'
# 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:
return False, (
f'unable to parse module version: {module_name:s} {module_version:s}')
if minimum_version:
try:
minimum_version_map = list(
map(int, self._VERSION_SPLIT_REGEX.split(minimum_version)))
except ValueError:
return False, (
f'unable to parse minimum version: {module_name:s} '
f'{minimum_version:s}')
if module_version_map < minimum_version_map:
return False, (
f'{module_name:s} version: {module_version!s} is too old, '
f'{minimum_version!s} or later required')
if maximum_version:
try:
maximum_version_map = list(
map(int, self._VERSION_SPLIT_REGEX.split(maximum_version)))
except ValueError:
return False, (
f'unable to parse maximum version: {module_name:s} '
f'{maximum_version:s}')
if module_version_map > maximum_version_map:
return False, (
f'{module_name:s} version: {module_version!s} is too recent, '
f'{maximum_version!s} or earlier required')
return True, f'{module_name:s} version: {module_version!s}'
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.
verbose_output (Optional[bool]): True if output should be verbose.
"""
if not result or dependency.is_optional:
if dependency.is_optional:
status_indicator = '[OPTIONAL]'
else:
status_indicator = '[FAILURE]'
print(f'{status_indicator:s}\t{status_message:s}')
elif verbose_output:
print(f'[OK]\t\t{status_message:s}')
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 _, dependency in sorted(self.dependencies.items()):
if dependency.skip_check:
continue
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):
if dependency.skip_check:
continue
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