Source code for tvb.core.code_versions.base_classes

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"""
.. moduleauthor:: Lia Domide <lia.domide@codemart.ro>
"""
import importlib
import os
from tvb.basic.logger.builder import get_logger
from tvb.basic.exceptions import TVBException


[docs] class InvalidUpgradeScriptException(TVBException): """ Raised in case an update script is present but does not comply to TVB conventions. """ pass
[docs] class UpdateManager(object): """ An update manager pattern. Goes through all the scripts, and based on the current version executed the one in need """ def __init__(self, module_scripts, check_version, current_version): self.log = get_logger(self.__class__.__module__) self.update_scripts_module = module_scripts self.checked_version = check_version self.current_version = current_version
[docs] def get_update_scripts(self, checked_version=None): """ Return all update scripts that need to be executed in order to bring code up to date. """ unprocessed_scripts = [] if checked_version is None: checked_version = self.checked_version for file_n in os.listdir(os.path.dirname(self.update_scripts_module.__file__)): if '_update' in file_n and file_n.endswith('.py'): version_nr = int(file_n.split('_')[0]) if version_nr > checked_version: unprocessed_scripts.append(file_n) result = sorted(unprocessed_scripts, key=lambda x: int(x.split('_')[0])) if result: self.log.info("Found unprocessed update scripts: %s." % result) return result
[docs] def run_update_script(self, script_name, **kwargs): """ Run one script file. """ script_module_name = self.update_scripts_module.__name__ + '.' + script_name.split('.')[0] script_module = importlib.import_module(script_module_name) if not hasattr(script_module, 'update'): raise InvalidUpgradeScriptException("Code update scripts should expose a 'update()' method.") script_module.update(**kwargs)
[docs] def run_all_updates(self, **kwargs): """ Upgrade the code to current version. """ if self.checked_version < self.current_version: for script_name in self.get_update_scripts(): self.log.info("We will run update %s" % script_name) self.run_update_script(script_name, **kwargs)