#
# 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.
#
"""Module of the current Interactive Beam environment.
For internal use only; no backwards-compatibility guarantees.
Provides interfaces to interact with existing Interactive Beam environment.
External Interactive Beam users please use interactive_beam module in
application code or notebook.
"""
# pytype: skip-file
from __future__ import absolute_import
import atexit
import importlib
import logging
import os
import sys
import tempfile
from collections.abc import Iterable
import apache_beam as beam
from apache_beam.runners import runner
from apache_beam.runners.interactive import cache_manager as cache
from apache_beam.runners.interactive.messaging.interactive_environment_inspector import InteractiveEnvironmentInspector
from apache_beam.runners.interactive.recording_manager import RecordingManager
from apache_beam.runners.interactive.user_pipeline_tracker import UserPipelineTracker
from apache_beam.runners.interactive.utils import register_ipython_log_handler
from apache_beam.utils.interactive_utils import is_in_ipython
from apache_beam.utils.interactive_utils import is_in_notebook
# Interactive Beam user flow is data-centric rather than pipeline-centric, so
# there is only one global interactive environment instance that manages
# implementation that enables interactivity.
_interactive_beam_env = None
_LOGGER = logging.getLogger(__name__)
# By `format(customized_script=xxx)`, the given `customized_script` is
# guaranteed to be executed within access to a jquery with datatable plugin
# configured which is useful so that any `customized_script` is resilient to
# browser refresh. Inside `customized_script`, use `$` as jQuery.
_JQUERY_WITH_DATATABLE_TEMPLATE = """
if (typeof window.interactive_beam_jquery == 'undefined') {{
var jqueryScript = document.createElement('script');
jqueryScript.src = 'https://code.jquery.com/jquery-3.4.1.slim.min.js';
jqueryScript.type = 'text/javascript';
jqueryScript.onload = function() {{
var datatableScript = document.createElement('script');
datatableScript.src = 'https://cdn.datatables.net/1.10.20/js/jquery.dataTables.min.js';
datatableScript.type = 'text/javascript';
datatableScript.onload = function() {{
window.interactive_beam_jquery = jQuery.noConflict(true);
window.interactive_beam_jquery(document).ready(function($){{
{customized_script}
}});
}}
document.head.appendChild(datatableScript);
}};
document.head.appendChild(jqueryScript);
}} else {{
window.interactive_beam_jquery(document).ready(function($){{
{customized_script}
}});
}}"""
# By `format(hrefs=xxx)`, the given `hrefs` will be imported as HTML imports.
# Since HTML import might not be supported by the browser, we check if HTML
# import is supported by the browser, if so, import HTMLs else setup
# webcomponents and chain the HTML import to the end of onload.
_HTML_IMPORT_TEMPLATE = """
var import_html = () => {{
{hrefs}.forEach(href => {{
var link = document.createElement('link');
link.rel = 'import'
link.href = href;
document.head.appendChild(link);
}});
}}
if ('import' in document.createElement('link')) {{
import_html();
}} else {{
var webcomponentScript = document.createElement('script');
webcomponentScript.src = 'https://cdnjs.cloudflare.com/ajax/libs/webcomponentsjs/1.3.3/webcomponents-lite.js';
webcomponentScript.type = 'text/javascript';
webcomponentScript.onload = function(){{
import_html();
}};
document.head.appendChild(webcomponentScript);
}}"""
[docs]def current_env():
"""Gets current Interactive Beam environment."""
global _interactive_beam_env
if not _interactive_beam_env:
_interactive_beam_env = InteractiveEnvironment()
return _interactive_beam_env
[docs]def new_env():
"""Creates a new Interactive Beam environment to replace current one."""
global _interactive_beam_env
if _interactive_beam_env:
_interactive_beam_env.cleanup()
_interactive_beam_env = None
return current_env()
[docs]class InteractiveEnvironment(object):
"""An interactive environment with cache and pipeline variable metadata.
Interactive Beam will use the watched variable information to determine if a
PCollection is assigned to a variable in user pipeline definition. When
executing the pipeline, interactivity is applied with implicit cache
mechanism for those PCollections if the pipeline is interactive. Users can
also visualize and introspect those PCollections in user code since they have
handles to the variables.
"""
def __init__(self):
# Registers a cleanup routine when system exits.
atexit.register(self.cleanup)
# Holds cache managers that manage source recording and intermediate
# PCollection cache for each pipeline. Each key is a stringified user
# defined pipeline instance's id.
self._cache_managers = {}
# Holds RecordingManagers keyed by pipeline instance id.
self._recording_managers = {}
# Holds class instances, module object, string of module names.
self._watching_set = set()
# Holds variables list of (Dict[str, object]).
self._watching_dict_list = []
# Holds results of main jobs as Dict[str, PipelineResult].
# Each key is a pipeline instance defined by the end user. The
# InteractiveRunner is responsible for populating this dictionary
# implicitly.
self._main_pipeline_results = {}
# Holds background caching jobs as Dict[str, BackgroundCachingJob].
# Each key is a pipeline instance defined by the end user. The
# InteractiveRunner or its enclosing scope is responsible for populating
# this dictionary implicitly when a background caching jobs is started.
self._background_caching_jobs = {}
# Holds TestStreamServiceControllers that controls gRPC servers serving
# events as test stream of TestStreamPayload.Event.
# Dict[str, TestStreamServiceController]. Each key is a pipeline
# instance defined by the end user. The InteractiveRunner or its enclosing
# scope is responsible for populating this dictionary implicitly when a new
# controller is created to start a new gRPC server. The server stays alive
# until a new background caching job is started thus invalidating everything
# the gRPC server serves.
self._test_stream_service_controllers = {}
self._cached_source_signature = {}
self._tracked_user_pipelines = UserPipelineTracker()
# Tracks the computation completeness of PCollections. PCollections tracked
# here don't need to be re-computed when data introspection is needed.
self._computed_pcolls = set()
# Always watch __main__ module.
self.watch('__main__')
# Do a warning level logging if current python version is below 3.6.
if sys.version_info < (3, 6):
self._is_py_version_ready = False
_LOGGER.warning('Interactive Beam requires Python 3.5.3+.')
else:
self._is_py_version_ready = True
# Check if [interactive] dependencies are installed.
try:
import IPython # pylint: disable=unused-import
import timeloop # pylint: disable=unused-import
from facets_overview.generic_feature_statistics_generator import GenericFeatureStatisticsGenerator # pylint: disable=unused-import
self._is_interactive_ready = True
except ImportError:
self._is_interactive_ready = False
_LOGGER.warning(
'Dependencies required for Interactive Beam PCollection '
'visualization are not available, please use: `pip '
'install apache-beam[interactive]` to install necessary '
'dependencies to enable all data visualization features.')
self._is_in_ipython = is_in_ipython()
self._is_in_notebook = is_in_notebook()
if not self._is_in_ipython:
_LOGGER.warning(
'You cannot use Interactive Beam features when you are '
'not in an interactive environment such as a Jupyter '
'notebook or ipython terminal.')
if self._is_in_ipython and not self._is_in_notebook:
_LOGGER.warning(
'You have limited Interactive Beam features since your '
'ipython kernel is not connected any notebook frontend.')
if self._is_in_notebook:
self.load_jquery_with_datatable()
register_ipython_log_handler()
# A singleton inspector instance to message information of current
# environment to other applications.
self._inspector = InteractiveEnvironmentInspector()
@property
def options(self):
"""A reference to the global interactive options.
Provided to avoid import loop or excessive dynamic import. All internal
Interactive Beam modules should access interactive_beam.options through
this property.
"""
from apache_beam.runners.interactive.interactive_beam import options
return options
@property
def is_py_version_ready(self):
"""If Python version is above the minimum requirement."""
return self._is_py_version_ready
@property
def is_interactive_ready(self):
"""If the [interactive] dependencies are installed."""
return self._is_interactive_ready
@property
def is_in_ipython(self):
"""If the runtime is within an IPython kernel."""
return self._is_in_ipython
@property
def is_in_notebook(self):
"""If the kernel is connected to a notebook frontend.
If not, it could be that the user is using kernel in a terminal or a unit
test.
"""
return self._is_in_notebook
@property
def inspector(self):
"""Gets the singleton InteractiveEnvironmentInspector to retrieve
information consumable by other applications."""
return self._inspector
[docs] def cleanup(self, pipeline=None):
"""Cleans up cached states for the given pipeline. Noop if the given
pipeline is absent from the environment. Cleans up for all pipelines
if no pipeline is specified."""
if pipeline:
from apache_beam.runners.interactive import background_caching_job as bcj
bcj.attempt_to_cancel_background_caching_job(pipeline)
bcj.attempt_to_stop_test_stream_service(pipeline)
cache_manager = self.get_cache_manager(pipeline)
if cache_manager:
cache_manager.cleanup()
else:
for _, job in self._background_caching_jobs.items():
if job:
job.cancel()
for _, controller in self._test_stream_service_controllers.items():
if controller:
controller.stop()
for _, cache_manager in self._cache_managers.items():
if cache_manager:
cache_manager.cleanup()
self.evict_recording_manager(pipeline)
self.evict_background_caching_job(pipeline)
self.evict_test_stream_service_controller(pipeline)
self.evict_computed_pcollections(pipeline)
self.evict_cached_source_signature(pipeline)
self.evict_pipeline_result(pipeline)
self.evict_tracked_pipelines(pipeline)
def _track_user_pipelines(self, watchable):
"""Tracks user pipelines from the given watchable."""
if isinstance(watchable, beam.Pipeline):
self._tracked_user_pipelines.add_user_pipeline(watchable)
elif isinstance(watchable, dict):
for v in watchable.values():
if isinstance(v, beam.Pipeline):
self._tracked_user_pipelines.add_user_pipeline(v)
elif isinstance(watchable, Iterable):
for v in watchable:
if isinstance(v, beam.Pipeline):
self._tracked_user_pipelines.add_user_pipeline(v)
[docs] def watch(self, watchable):
"""Watches a watchable.
A watchable can be a dictionary of variable metadata such as locals(), a str
name of a module, a module object or an instance of a class. The variable
can come from any scope even local. Duplicated variable naming doesn't
matter since they are different instances. Duplicated variables are also
allowed when watching.
"""
self._track_user_pipelines(watchable)
if isinstance(watchable, dict):
self._watching_dict_list.append(watchable.items())
else:
self._watching_set.add(watchable)
[docs] def watching(self):
"""Analyzes and returns a list of pair lists referring to variable names and
values from watched scopes.
Each entry in the list represents the variable defined within a watched
watchable. Currently, each entry holds a list of pairs. The format might
change in the future to hold more metadata. Duplicated pairs are allowed.
And multiple paris can have the same variable name as the "first" while
having different variable values as the "second" since variables in
different scopes can have the same name.
"""
watching = list(self._watching_dict_list)
for watchable in self._watching_set:
if isinstance(watchable, str):
module = importlib.import_module(watchable)
watching.append(vars(module).items())
else:
watching.append(vars(watchable).items())
return watching
[docs] def set_cache_manager(self, cache_manager, pipeline):
"""Sets the cache manager held by current Interactive Environment for the
given pipeline."""
if self.get_cache_manager(pipeline) is cache_manager:
# NOOP if setting to the same cache_manager.
return
if self.get_cache_manager(pipeline):
# Invoke cleanup routine when a new cache_manager is forcefully set and
# current cache_manager is not None.
self.cleanup(pipeline)
self._cache_managers[str(id(pipeline))] = cache_manager
[docs] def get_cache_manager(self, pipeline, create_if_absent=False):
"""Gets the cache manager held by current Interactive Environment for the
given pipeline. If the pipeline is absent from the environment while
create_if_absent is True, creates and returns a new file based cache
manager for the pipeline."""
cache_manager = self._cache_managers.get(str(id(pipeline)), None)
if not cache_manager and create_if_absent:
cache_dir = tempfile.mkdtemp(
suffix=str(id(pipeline)),
prefix='it-',
dir=os.environ.get('TEST_TMPDIR', None))
cache_manager = cache.FileBasedCacheManager(cache_dir)
self._cache_managers[str(id(pipeline))] = cache_manager
return cache_manager
[docs] def evict_cache_manager(self, pipeline=None):
"""Evicts the cache manager held by current Interactive Environment for the
given pipeline. Noop if the pipeline is absent from the environment. If no
pipeline is specified, evicts for all pipelines."""
self.cleanup(pipeline)
if pipeline:
return self._cache_managers.pop(str(id(pipeline)), None)
self._cache_managers.clear()
[docs] def set_recording_manager(self, recording_manager, pipeline):
"""Sets the recording manager for the given pipeline."""
if self.get_recording_manager(pipeline) is recording_manager:
# NOOP if setting to the same recording_manager.
return
self._recording_managers[str(id(pipeline))] = recording_manager
[docs] def get_recording_manager(self, pipeline, create_if_absent=False):
"""Gets the recording manager for the given pipeline."""
recording_manager = self._recording_managers.get(str(id(pipeline)), None)
if not recording_manager and create_if_absent:
# Get the pipeline variable name for the user. This is useful if the user
# has multiple pipelines.
pipeline_var = ''
for w in self.watching():
for var, val in w:
if val is pipeline:
pipeline_var = var
break
recording_manager = RecordingManager(pipeline, pipeline_var)
self._recording_managers[str(id(pipeline))] = recording_manager
return recording_manager
[docs] def evict_recording_manager(self, pipeline):
"""Evicts the recording manager for the given pipeline.
This stops the background caching job and clears the cache.
Noop if the pipeline is absent from the environment. If no
pipeline is specified, evicts for all pipelines.
"""
if not pipeline:
for rm in self._recording_managers.values():
rm.cancel()
rm.clear()
self._recording_managers = {}
return
recording_manager = self.get_recording_manager(pipeline)
if recording_manager:
recording_manager.cancel()
recording_manager.clear()
del self._recording_managers[str(id(pipeline))]
[docs] def describe_all_recordings(self):
"""Returns a description of the recording for all watched pipelnes."""
return {
self.pipeline_id_to_pipeline(pid): rm.describe()
for pid,
rm in self._recording_managers.items()
}
[docs] def set_pipeline_result(self, pipeline, result):
"""Sets the pipeline run result. Adds one if absent. Otherwise, replace."""
assert issubclass(type(pipeline), beam.Pipeline), (
'pipeline must be an instance of apache_beam.Pipeline or its subclass')
assert issubclass(type(result), runner.PipelineResult), (
'result must be an instance of '
'apache_beam.runners.runner.PipelineResult or its subclass')
self._main_pipeline_results[str(id(pipeline))] = result
[docs] def evict_pipeline_result(self, pipeline=None):
"""Evicts the last run result of the given pipeline. Noop if the pipeline
is absent from the environment. If no pipeline is specified, evicts for all
pipelines."""
if pipeline:
return self._main_pipeline_results.pop(str(id(pipeline)), None)
self._main_pipeline_results.clear()
[docs] def pipeline_result(self, pipeline):
"""Gets the pipeline run result. None if absent."""
return self._main_pipeline_results.get(str(id(pipeline)), None)
[docs] def set_background_caching_job(self, pipeline, background_caching_job):
"""Sets the background caching job started from the given pipeline."""
assert issubclass(type(pipeline), beam.Pipeline), (
'pipeline must be an instance of apache_beam.Pipeline or its subclass')
from apache_beam.runners.interactive.background_caching_job import BackgroundCachingJob
assert isinstance(background_caching_job, BackgroundCachingJob), (
'background_caching job must be an instance of BackgroundCachingJob')
self._background_caching_jobs[str(id(pipeline))] = background_caching_job
[docs] def get_background_caching_job(self, pipeline):
"""Gets the background caching job started from the given pipeline."""
return self._background_caching_jobs.get(str(id(pipeline)), None)
[docs] def evict_background_caching_job(self, pipeline=None):
"""Evicts the background caching job started from the given pipeline. Noop
if the given pipeline is absent from the environment. If no pipeline is
specified, evicts for all pipelines."""
if pipeline:
return self._background_caching_jobs.pop(str(id(pipeline)), None)
self._background_caching_jobs.clear()
[docs] def set_test_stream_service_controller(self, pipeline, controller):
"""Sets the test stream service controller that has started a gRPC server
serving the test stream for any job started from the given user defined
pipeline.
"""
self._test_stream_service_controllers[str(id(pipeline))] = controller
[docs] def get_test_stream_service_controller(self, pipeline):
"""Gets the test stream service controller that has started a gRPC server
serving the test stream for any job started from the given user defined
pipeline.
"""
return self._test_stream_service_controllers.get(str(id(pipeline)), None)
[docs] def evict_test_stream_service_controller(self, pipeline):
"""Evicts and pops the test stream service controller that has started a
gRPC server serving the test stream for any job started from the given
user defined pipeline. Noop if the given pipeline is absent from the
environment. If no pipeline is specified, evicts for all pipelines.
"""
if pipeline:
return self._test_stream_service_controllers.pop(str(id(pipeline)), None)
self._test_stream_service_controllers.clear()
[docs] def is_terminated(self, pipeline):
"""Queries if the most recent job (by executing the given pipeline) state
is in a terminal state. True if absent."""
result = self.pipeline_result(pipeline)
if result:
return runner.PipelineState.is_terminal(result.state)
return True
[docs] def set_cached_source_signature(self, pipeline, signature):
self._cached_source_signature[str(id(pipeline))] = signature
[docs] def get_cached_source_signature(self, pipeline):
return self._cached_source_signature.get(str(id(pipeline)), set())
[docs] def evict_cached_source_signature(self, pipeline=None):
"""Evicts the signature generated for each recorded source of the given
pipeline. Noop if the given pipeline is absent from the environment. If no
pipeline is specified, evicts for all pipelines."""
if pipeline:
return self._cached_source_signature.pop(str(id(pipeline)), None)
self._cached_source_signature.clear()
[docs] def track_user_pipelines(self):
"""Record references to all user defined pipeline instances watched in
current environment.
Current static global singleton interactive environment holds references to
a set of pipeline instances defined by the user in the watched scope.
Interactive Beam features could use the references to determine if a given
pipeline is defined by user or implicitly created by Beam SDK or runners,
then handle them differently.
This is invoked every time a PTransform is to be applied if the current
code execution is under ipython due to the possibility that any user defined
pipeline can be re-evaluated through notebook cell re-execution at any time.
Each time this is invoked, it will check if there is a cache manager
already created for each user defined pipeline. If not, create one for it.
If a pipeline is no longer watched due to re-execution while its
PCollections are still in watched scope, the pipeline becomes anonymous but
still accessible indirectly through references to its PCollections. This
function also clears up internal states for those anonymous pipelines once
all their PCollections are anonymous.
"""
for watching in self.watching():
for _, val in watching:
if isinstance(val, beam.pipeline.Pipeline):
self._tracked_user_pipelines.add_user_pipeline(val)
_ = self.get_cache_manager(val, create_if_absent=True)
_ = self.get_recording_manager(val, create_if_absent=True)
all_tracked_pipeline_ids = set(self._background_caching_jobs.keys()).union(
set(self._test_stream_service_controllers.keys()),
set(self._cache_managers.keys()),
{str(id(pcoll.pipeline))
for pcoll in self._computed_pcolls},
set(self._cached_source_signature.keys()),
set(self._main_pipeline_results.keys()))
inspectable_pipelines = self._inspector.inspectable_pipelines
for pipeline in all_tracked_pipeline_ids:
if pipeline not in inspectable_pipelines:
self.cleanup(pipeline)
@property
def tracked_user_pipelines(self):
"""Returns the user pipelines in this environment."""
for p in self._tracked_user_pipelines:
yield p
[docs] def user_pipeline(self, derived_pipeline):
"""Returns the user pipeline for the given derived pipeline."""
return self._tracked_user_pipelines.get_user_pipeline(derived_pipeline)
[docs] def add_user_pipeline(self, user_pipeline):
self._tracked_user_pipelines.add_user_pipeline(user_pipeline)
[docs] def add_derived_pipeline(self, user_pipeline, derived_pipeline):
"""Adds the derived pipeline to the parent user pipeline."""
self._tracked_user_pipelines.add_derived_pipeline(
user_pipeline, derived_pipeline)
[docs] def evict_tracked_pipelines(self, user_pipeline):
"""Evicts the user pipeline and its derived pipelines."""
if user_pipeline:
self._tracked_user_pipelines.evict(user_pipeline)
[docs] def pipeline_id_to_pipeline(self, pid):
"""Converts a pipeline id to a user pipeline.
"""
return self._tracked_user_pipelines.get_pipeline(pid)
[docs] def mark_pcollection_computed(self, pcolls):
"""Marks computation completeness for the given pcolls.
Interactive Beam can use this information to determine if a computation is
needed to introspect the data of any given PCollection.
"""
self._computed_pcolls.update(pcoll for pcoll in pcolls)
[docs] def evict_computed_pcollections(self, pipeline=None):
"""Evicts all computed PCollections for the given pipeline. If no pipeline
is specified, evicts for all pipelines.
"""
if pipeline:
discarded = set()
for pcoll in self._computed_pcolls:
if pcoll.pipeline is pipeline:
discarded.add(pcoll)
self._computed_pcolls -= discarded
else:
self._computed_pcolls = set()
@property
def computed_pcollections(self):
return self._computed_pcolls
[docs] def load_jquery_with_datatable(self):
"""Loads common resources to enable jquery with datatable configured for
notebook frontends if necessary. If the resources have been loaded, NOOP.
A window.interactive_beam_jquery with datatable plugin configured can be
used in following notebook cells once this is invoked.
#. There should only be one jQuery imported.
#. Datatable needs to be imported after jQuery is loaded.
#. Imported jQuery is attached to window named as jquery[version].
#. The window attachment needs to happen at the end of import chain until
all jQuery plugins are set.
"""
try:
from IPython.core.display import Javascript
from IPython.core.display import display_javascript
display_javascript(
Javascript(
_JQUERY_WITH_DATATABLE_TEMPLATE.format(customized_script='')))
except ImportError:
pass # NOOP if dependencies are not available.
[docs] def import_html_to_head(self, html_hrefs):
"""Imports given external HTMLs (supported through webcomponents) into
the head of the document.
On load of webcomponentsjs, import given HTMLs. If HTML import is already
supported, skip loading webcomponentsjs.
No matter how many times an HTML import occurs in the document, only the
first occurrence really embeds the external HTML. In a notebook environment,
the body of the document is always changing due to cell [re-]execution,
deletion and re-ordering. Thus, HTML imports shouldn't be put in the body
especially the output areas of notebook cells.
"""
try:
from IPython.core.display import Javascript
from IPython.core.display import display_javascript
display_javascript(
Javascript(_HTML_IMPORT_TEMPLATE.format(hrefs=html_hrefs)))
except ImportError:
pass # NOOP if dependencies are not available.