#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.
#
"""Utility class for serializing pipelines via the runner API.
For internal use only; no backwards-compatibility guarantees.
"""
# pytype: skip-file
# mypy: disallow-untyped-defs
from __future__ import absolute_import
from builtins import object
from typing import TYPE_CHECKING
from typing import Any
from typing import Dict
from typing import FrozenSet
from typing import Generic
from typing import Iterable
from typing import Mapping
from typing import Optional
from typing import Type
from typing import TypeVar
from typing import Union
from typing_extensions import Protocol
from apache_beam import coders
from apache_beam import pipeline
from apache_beam import pvalue
from apache_beam.internal import pickler
from apache_beam.pipeline import ComponentIdMap
from apache_beam.portability.api import beam_fn_api_pb2
from apache_beam.portability.api import beam_runner_api_pb2
from apache_beam.transforms import core
from apache_beam.transforms import environments
from apache_beam.typehints import native_type_compatibility
if TYPE_CHECKING:
from google.protobuf import message # pylint: disable=ungrouped-imports
from apache_beam.coders.coder_impl import IterableStateReader
from apache_beam.coders.coder_impl import IterableStateWriter
PortableObjectT = TypeVar('PortableObjectT', bound='PortableObject')
[docs]class PortableObject(Protocol):
[docs] def to_runner_api(self, __context):
# type: (PipelineContext) -> Any
pass
[docs] @classmethod
def from_runner_api(cls, __proto, __context):
# type: (Any, PipelineContext) -> Any
pass
class _PipelineContextMap(Generic[PortableObjectT]):
"""This is a bi-directional map between objects and ids.
Under the hood it encodes and decodes these objects into runner API
representations.
"""
def __init__(self,
context, # type: PipelineContext
obj_type, # type: Type[PortableObjectT]
namespace, # type: str
proto_map=None # type: Optional[Mapping[str, message.Message]]
):
# type: (...) -> None
self._pipeline_context = context
self._obj_type = obj_type
self._namespace = namespace
self._obj_to_id = {} # type: Dict[Any, str]
self._id_to_obj = {} # type: Dict[str, Any]
self._id_to_proto = dict(proto_map) if proto_map else {}
def populate_map(self, proto_map):
# type: (Mapping[str, message.Message]) -> None
for id, proto in self._id_to_proto.items():
proto_map[id].CopyFrom(proto)
def get_id(self, obj, label=None):
# type: (PortableObjectT, Optional[str]) -> str
if obj not in self._obj_to_id:
id = self._pipeline_context.component_id_map.get_or_assign(
obj, self._obj_type, label)
self._id_to_obj[id] = obj
self._obj_to_id[obj] = id
self._id_to_proto[id] = obj.to_runner_api(self._pipeline_context)
return self._obj_to_id[obj]
def get_proto(self, obj, label=None):
# type: (PortableObjectT, Optional[str]) -> message.Message
return self._id_to_proto[self.get_id(obj, label)]
def get_by_id(self, id):
# type: (str) -> PortableObjectT
if id not in self._id_to_obj:
self._id_to_obj[id] = self._obj_type.from_runner_api(
self._id_to_proto[id], self._pipeline_context)
return self._id_to_obj[id]
def get_by_proto(self, maybe_new_proto, label=None, deduplicate=False):
# type: (message.Message, Optional[str], bool) -> str
if deduplicate:
for id, proto in self._id_to_proto.items():
if proto == maybe_new_proto:
return id
return self.put_proto(
self._pipeline_context.component_id_map.get_or_assign(
label, obj_type=self._obj_type),
maybe_new_proto)
def get_id_to_proto_map(self):
# type: () -> Dict[str, message.Message]
return self._id_to_proto
def get_proto_from_id(self, id):
# type: (str) -> message.Message
return self.get_id_to_proto_map()[id]
def put_proto(self, id, proto, ignore_duplicates=False):
# type: (str, message.Message, bool) -> str
if not ignore_duplicates and id in self._id_to_proto:
raise ValueError("Id '%s' is already taken." % id)
elif (ignore_duplicates and id in self._id_to_proto and
self._id_to_proto[id] != proto):
raise ValueError(
'Cannot insert different protos %r and %r with the same ID %r',
self._id_to_proto[id],
proto,
id)
self._id_to_proto[id] = proto
return id
def __getitem__(self, id):
# type: (str) -> Any
return self.get_by_id(id)
def __contains__(self, id):
# type: (str) -> bool
return id in self._id_to_proto
[docs]class PipelineContext(object):
"""For internal use only; no backwards-compatibility guarantees.
Used for accessing and constructing the referenced objects of a Pipeline.
"""
def __init__(self,
proto=None, # type: Optional[Union[beam_runner_api_pb2.Components, beam_fn_api_pb2.ProcessBundleDescriptor]]
component_id_map=None, # type: Optional[pipeline.ComponentIdMap]
default_environment=None, # type: Optional[environments.Environment]
use_fake_coders=False, # type: bool
iterable_state_read=None, # type: Optional[IterableStateReader]
iterable_state_write=None, # type: Optional[IterableStateWriter]
namespace='ref', # type: str
requirements=(), # type: Iterable[str]
):
# type: (...) -> None
if isinstance(proto, beam_fn_api_pb2.ProcessBundleDescriptor):
proto = beam_runner_api_pb2.Components(
coders=dict(proto.coders.items()),
windowing_strategies=dict(proto.windowing_strategies.items()),
environments=dict(proto.environments.items()))
self.component_id_map = component_id_map or ComponentIdMap(namespace)
assert self.component_id_map.namespace == namespace
self.transforms = _PipelineContextMap(
self,
pipeline.AppliedPTransform,
namespace,
proto.transforms if proto is not None else None)
self.pcollections = _PipelineContextMap(
self,
pvalue.PCollection,
namespace,
proto.pcollections if proto is not None else None)
self.coders = _PipelineContextMap(
self,
coders.Coder,
namespace,
proto.coders if proto is not None else None)
self.windowing_strategies = _PipelineContextMap(
self,
core.Windowing,
namespace,
proto.windowing_strategies if proto is not None else None)
self.environments = _PipelineContextMap(
self,
environments.Environment,
namespace,
proto.environments if proto is not None else None)
if default_environment:
self._default_environment_id = self.environments.get_id(
default_environment,
label='default_environment') # type: Optional[str]
else:
self._default_environment_id = None
self.use_fake_coders = use_fake_coders
self.iterable_state_read = iterable_state_read
self.iterable_state_write = iterable_state_write
self._requirements = set(requirements)
[docs] def add_requirement(self, requirement):
# type: (str) -> None
self._requirements.add(requirement)
[docs] def requirements(self):
# type: () -> FrozenSet[str]
return frozenset(self._requirements)
# If fake coders are requested, return a pickled version of the element type
# rather than an actual coder. The element type is required for some runners,
# as well as performing a round-trip through protos.
# TODO(BEAM-2717): Remove once this is no longer needed.
[docs] def coder_id_from_element_type(self, element_type):
# type: (Any) -> str
if self.use_fake_coders:
return pickler.dumps(element_type).decode('ascii')
else:
return self.coders.get_id(coders.registry.get_coder(element_type))
[docs] def element_type_from_coder_id(self, coder_id):
# type: (str) -> Any
if self.use_fake_coders or coder_id not in self.coders:
return pickler.loads(coder_id)
else:
return native_type_compatibility.convert_to_beam_type(
self.coders[coder_id].to_type_hint())
[docs] @staticmethod
def from_runner_api(proto):
# type: (beam_runner_api_pb2.Components) -> PipelineContext
return PipelineContext(proto)
[docs] def to_runner_api(self):
# type: () -> beam_runner_api_pb2.Components
context_proto = beam_runner_api_pb2.Components()
self.transforms.populate_map(context_proto.transforms)
self.pcollections.populate_map(context_proto.pcollections)
self.coders.populate_map(context_proto.coders)
self.windowing_strategies.populate_map(context_proto.windowing_strategies)
self.environments.populate_map(context_proto.environments)
return context_proto
[docs] def default_environment_id(self):
# type: () -> Optional[str]
return self._default_environment_id