Source code for renku.models.cwl.workflow
# -*- coding: utf-8 -*-
#
# Copyright 2018 - Swiss Data Science Center (SDSC)
# A partnership between École Polytechnique Fédérale de Lausanne (EPFL) and
# Eidgenössische Technische Hochschule Zürich (ETHZ).
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Represent workflows from the Common Workflow Language."""
import fnmatch
import uuid
import attr
from .._sort import topological
from ._ascwl import CWLClass, mapped
from .parameter import WorkflowOutputParameter
from .process import Process
[docs]def convert_run(value):
"""Convert value to CWLClass if dict is given."""
if isinstance(value, dict):
return CWLClass.from_cwl(value)
return value
[docs]@attr.s
class WorkflowStep(object):
"""Define an executable element of a workflow."""
run = attr.ib(converter=convert_run) # string, Process
id = attr.ib(default=attr.Factory(uuid.uuid4))
in_ = attr.ib(default=None)
out = attr.ib(default=None)
[docs]@attr.s
class Workflow(Process, CWLClass):
"""Define a workflow representation."""
outputs = mapped(WorkflowOutputParameter)
steps = mapped(WorkflowStep)
@property
def topological_steps(self):
"""Return topologically sorted steps."""
step_map = {step.id: step for step in self.steps}
steps = {
step.id: [
source.split('/')[0]
for source in step.in_.values() if '/' in source
]
for step in self.steps
}
return [step_map[step_id] for step_id in topological(steps)]
[docs] def create_run(self, **kwargs):
"""Return an instance of process run."""
from renku.models.provenance import WorkflowRun
return WorkflowRun(**kwargs)
[docs] def add_step(self, **kwargs):
"""Add a workflow step."""
self.steps.append(WorkflowStep(**kwargs))
[docs] def get_output_id(self, path): # pragma: no cover
"""Return an id of the matching path from default values."""
for output in self.outputs:
if output.type != 'File':
continue
if output.outputSource:
step_id, _, source = output.outputSource.partition('/')
for workflow_step in self.steps:
if workflow_step.id == step_id:
break
else:
continue
if source not in workflow_step.out:
continue
# TODO load step and call get_output_id
elif output.outputBinding:
glob = output.outputBinding.glob
# TODO better support for Expression
if glob.startswith('$(inputs.'):
input_id = glob[len('$(inputs.'):-1]
for input_ in self.inputs:
if input_.id == input_id and input_.default == path:
return output.id
elif fnmatch.fnmatch(path, glob):
return output.id