Creating Mistral workflows for the new python-tripleoclient CLI command¶
The next step is to define the tripleo.undercloud_backup.v1.prepare_environment Mistral workflow, all the Mistral workbooks, workflows and actions will be defined in the tripleo-common repository.
Let’s go inside tripleo-common
cd dev-docs
cd tripleo-common
And see it’s content:
[stack@undercloud tripleo-common]$ ls
AUTHORS doc README.rst test-requirements.txt
babel.cfg HACKING.rst releasenotes tools
build healthcheck requirements.txt tox.ini
ChangeLog heat_docker_agent scripts tripleo_common
container-images image-yaml setup.cfg undercloud_heat_plugins
contrib LICENSE setup.py workbooks
CONTRIBUTING.rst playbooks sudoers zuul.d
Again, we need to check the setup.cfg file. This file defines all the Mistral actions we can call. Specifically, we will need at the end of this file our new actions:
tripleo.undercloud.get_free_space = tripleo_common.actions.undercloud:GetFreeSpace
tripleo.undercloud.create_backup_dir = tripleo_common.actions.undercloud:CreateBackupDir
tripleo.undercloud.create_database_backup = tripleo_common.actions.undercloud:CreateDatabaseBackup
tripleo.undercloud.create_file_system_backup = tripleo_common.actions.undercloud:CreateFileSystemBackup
tripleo.undercloud.upload_backup_to_swift = tripleo_common.actions.undercloud:UploadUndercloudBackupToSwift
4.1. Action definition¶
Let’s take the first action to describe it’s definition, tripleo.undercloud.get_free_space = tripleo_common.actions.undercloud:GetFreeSpace
We have defined the action named as tripleo.undercloud.get_free_space which will instantiate the class GetFreeSpace defined in the file tripleo_common/actions/undercloud.py file.
If we open tripleo_common/actions/undercloud.py we can see the class definition as:
class GetFreeSpace(base.Action):
""""
Get the Undercloud free space for the backup.
The default path to check will be /var/tmp and the
default minimum size will be 10240 MB (10GB).
""""
def __init__(self, min_space=10240):
self.min_space = min_space
def run(self, context):
temp_path = tempfile.gettempdir()
min_space = self.min_space
while not os.path.isdir(temp_path):
head, tail = os.path.split(temp_path)
temp_path = head
available_space = (
(os.statvfs(temp_path).f_frsize * os.statvfs(temp_path).f_bavail) /
(1024 * 1024))
if (available_space < min_space):
msg = "There is no enough space, avail. - %s MB" \
% str(available_space)
return actions.Result(error={'msg': msg})
else:
msg = "There is enough space
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