110 lines
3.8 KiB
Python
110 lines
3.8 KiB
Python
# Copyright 2019 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import hashlib
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import json
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from kubernetes.client.models import (
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V1Volume, V1PersistentVolumeClaimVolumeSource
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)
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from . import _pipeline
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class PipelineVolume(V1Volume):
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"""Representing a volume that is passed between pipeline operators and is
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to be mounted by a ContainerOp or its inherited type.
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A PipelineVolume object can be used as an extention of the pipeline
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function's filesystem. It may then be passed between ContainerOps,
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exposing dependencies.
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"""
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def __init__(self,
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pvc: str = None,
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volume: V1Volume = None,
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**kwargs):
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"""Create a new instance of PipelineVolume.
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Args:
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pvc: The name of an existing PVC
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volume: Create a deep copy out of a V1Volume or PipelineVolume
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with no deps
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Raises:
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ValueError: if volume is not None and kwargs is not None
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if pvc is not None and kwargs.pop("name") is not None
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"""
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if volume and kwargs:
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raise ValueError("You can't pass a volume along with other "
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"kwargs.")
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name_provided = True
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init_volume = {}
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if volume:
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init_volume = {attr: getattr(volume, attr)
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for attr in self.attribute_map.keys()}
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else:
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if "name" in kwargs:
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init_volume = {"name": kwargs.pop("name")}
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else:
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name_provided = False
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init_volume = {"name": "pvolume-placeholder"}
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if pvc and kwargs:
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raise ValueError("You can only pass 'name' along with 'pvc'.")
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elif pvc and not kwargs:
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pvc_volume_source = V1PersistentVolumeClaimVolumeSource(
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claim_name=pvc
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)
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init_volume["persistent_volume_claim"] = pvc_volume_source
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super().__init__(**init_volume, **kwargs)
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if not name_provided:
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self.name = "pvolume-%s" % hashlib.sha256(
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bytes(json.dumps(self.to_dict(), sort_keys=True), "utf-8")
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).hexdigest()
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self.dependent_names = []
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def after(self, *ops):
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"""Creates a duplicate of self with the required dependecies excluding
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the redundant dependenices.
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Args:
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*ops: Pipeline operators to add as dependencies
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"""
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def implies(newdep, olddep):
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if newdep.name == olddep:
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return True
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for parentdep_name in newdep.dependent_names:
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if parentdep_name == olddep:
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return True
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else:
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parentdep = _pipeline.Pipeline.get_default_pipeline(
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).ops[parentdep_name]
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if parentdep:
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if implies(parentdep, olddep):
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return True
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return False
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ret = self.__class__(volume=self)
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ret.dependent_names = [op.name for op in ops]
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for olddep in self.dependent_names:
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implied = False
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for newdep in ops:
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implied = implies(newdep, olddep)
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if implied:
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break
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if not implied:
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ret.dependent_names.append(olddep)
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return ret
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