# Copyright 2019 Google LLC
#
# 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.
import re
from typing import List, Dict
from kubernetes.client.models import (
V1ObjectMeta, V1ResourceRequirements, V1PersistentVolumeClaimSpec,
V1PersistentVolumeClaim, V1TypedLocalObjectReference
)
from ._resource_op import ResourceOp
from ._pipeline_param import (
PipelineParam, match_serialized_pipelineparam, sanitize_k8s_name
)
from ._pipeline_volume import PipelineVolume
VOLUME_MODE_RWO = ["ReadWriteOnce"]
VOLUME_MODE_RWM = ["ReadWriteMany"]
VOLUME_MODE_ROM = ["ReadOnlyMany"]
[docs]class VolumeOp(ResourceOp):
"""Represents an op which will be translated into a resource template
which will be creating a PVC.
"""
def __init__(self,
resource_name: str = None,
size: str = None,
storage_class: str = None,
modes: List[str] = VOLUME_MODE_RWM,
annotations: Dict[str, str] = None,
data_source=None,
**kwargs):
"""Create a new instance of VolumeOp.
Args:
resource_name: A desired name for the PVC which will be created
size: The size of the PVC which will be created
storage_class: The storage class to use for the dynamically created
PVC
modes: The access modes for the PVC
annotations: Annotations to be patched in the PVC
data_source: May be a V1TypedLocalObjectReference, and then it is
used in the data_source field of the PVC as is. Can also be a
string/PipelineParam, and in that case it will be used as a
VolumeSnapshot name (Alpha feature)
kwargs: See ResourceOp definition
Raises:
ValueError: if k8s_resource is provided along with other arguments
if k8s_resource is not a V1PersistentVolumeClaim
if size is None
if size is an invalid memory string (when not a
PipelineParam)
if data_source is not one of (str, PipelineParam,
V1TypedLocalObjectReference)
"""
# Add size to attribute outputs
self.attribute_outputs = {"size": "{.status.capacity.storage}"}
if "k8s_resource" in kwargs:
if resource_name or size or storage_class or modes or annotations:
raise ValueError("You cannot provide k8s_resource along with "
"other arguments.")
if not isinstance(kwargs["k8s_resource"], V1PersistentVolumeClaim):
raise ValueError("k8s_resource in VolumeOp must be an instance"
" of V1PersistentVolumeClaim")
super().__init__(**kwargs)
self.volume = PipelineVolume(
name=sanitize_k8s_name(self.name),
pvc=self.outputs["name"]
)
return
if not size:
raise ValueError("Please provide size")
elif not match_serialized_pipelineparam(str(size)):
self._validate_memory_string(size)
if data_source and not isinstance(
data_source, (str, PipelineParam, V1TypedLocalObjectReference)):
raise ValueError("data_source can be one of (str, PipelineParam, "
"V1TypedLocalObjectReference).")
if data_source and isinstance(data_source, (str, PipelineParam)):
data_source = V1TypedLocalObjectReference(
api_group="snapshot.storage.k8s.io",
kind="VolumeSnapshot",
name=data_source
)
# Set the k8s_resource
if not match_serialized_pipelineparam(str(resource_name)):
resource_name = sanitize_k8s_name(resource_name)
pvc_metadata = V1ObjectMeta(
name="{{workflow.name}}-%s" % resource_name,
annotations=annotations
)
requested_resources = V1ResourceRequirements(
requests={"storage": size}
)
pvc_spec = V1PersistentVolumeClaimSpec(
access_modes=modes,
resources=requested_resources,
storage_class_name=storage_class,
data_source=data_source
)
k8s_resource = V1PersistentVolumeClaim(
api_version="v1",
kind="PersistentVolumeClaim",
metadata=pvc_metadata,
spec=pvc_spec
)
super().__init__(
k8s_resource=k8s_resource,
**kwargs,
)
self.volume = PipelineVolume(
name=sanitize_k8s_name(self.name),
pvc=self.outputs["name"]
)
def _validate_memory_string(self, memory_string):
"""Validate a given string is valid for memory request or limit."""
if re.match(r'^[0-9]+(E|Ei|P|Pi|T|Ti|G|Gi|M|Mi|K|Ki){0,1}$',
memory_string) is None:
raise ValueError('Invalid memory string. Should be an integer, ' +
'or integer followed by one of ' +
'"E|Ei|P|Pi|T|Ti|G|Gi|M|Mi|K|Ki"')