/
python.py
1117 lines (964 loc) · 47.3 KB
/
python.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#
# 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.
from __future__ import annotations
import fcntl
import importlib
import inspect
import json
import logging
import os
import shutil
import subprocess
import sys
import textwrap
import types
import warnings
from abc import ABCMeta, abstractmethod
from collections.abc import Container
from pathlib import Path
from tempfile import TemporaryDirectory
from typing import TYPE_CHECKING, Any, Callable, Collection, Iterable, Mapping, NamedTuple, Sequence, cast
import lazy_object_proxy
from airflow.compat.functools import cache
from airflow.exceptions import (
AirflowConfigException,
AirflowException,
AirflowSkipException,
DeserializingResultError,
RemovedInAirflow3Warning,
)
from airflow.models.baseoperator import BaseOperator
from airflow.models.skipmixin import SkipMixin
from airflow.models.taskinstance import _CURRENT_CONTEXT
from airflow.models.variable import Variable
from airflow.operators.branch import BranchMixIn
from airflow.typing_compat import Literal
from airflow.utils import hashlib_wrapper
from airflow.utils.context import context_copy_partial, context_get_outlet_events, context_merge
from airflow.utils.file import get_unique_dag_module_name
from airflow.utils.operator_helpers import ExecutionCallableRunner, KeywordParameters
from airflow.utils.process_utils import execute_in_subprocess
from airflow.utils.python_virtualenv import prepare_virtualenv, write_python_script
log = logging.getLogger(__name__)
if TYPE_CHECKING:
from pendulum.datetime import DateTime
from airflow.utils.context import Context
def is_venv_installed() -> bool:
"""
Check if the virtualenv package is installed via checking if it is on the path or installed as package.
:return: True if it is. Whichever way of checking it works, is fine.
"""
if shutil.which("virtualenv") or importlib.util.find_spec("virtualenv"):
return True
return False
def task(python_callable: Callable | None = None, multiple_outputs: bool | None = None, **kwargs):
"""Use :func:`airflow.decorators.task` instead, this is deprecated.
Calls ``@task.python`` and allows users to turn a Python function into
an Airflow task.
:param python_callable: A reference to an object that is callable
:param op_kwargs: a dictionary of keyword arguments that will get unpacked
in your function (templated)
:param op_args: a list of positional arguments that will get unpacked when
calling your callable (templated)
:param multiple_outputs: if set, function return value will be
unrolled to multiple XCom values. Dict will unroll to xcom values with keys as keys.
Defaults to False.
"""
# To maintain backwards compatibility, we import the task object into this file
# This prevents breakages in dags that use `from airflow.operators.python import task`
from airflow.decorators.python import python_task
warnings.warn(
"""airflow.operators.python.task is deprecated. Please use the following instead
from airflow.decorators import task
@task
def my_task()""",
RemovedInAirflow3Warning,
stacklevel=2,
)
return python_task(python_callable=python_callable, multiple_outputs=multiple_outputs, **kwargs)
@cache
def _parse_version_info(text: str) -> tuple[int, int, int, str, int]:
"""Parse python version info from a text."""
parts = text.strip().split(".")
if len(parts) != 5:
msg = f"Invalid Python version info, expected 5 components separated by '.', but got {text!r}."
raise ValueError(msg)
try:
return int(parts[0]), int(parts[1]), int(parts[2]), parts[3], int(parts[4])
except ValueError:
msg = f"Unable to convert parts {parts} parsed from {text!r} to (int, int, int, str, int)."
raise ValueError(msg) from None
class _PythonVersionInfo(NamedTuple):
"""Provide the same interface as ``sys.version_info``."""
major: int
minor: int
micro: int
releaselevel: str
serial: int
@classmethod
def from_executable(cls, executable: str) -> _PythonVersionInfo:
"""Parse python version info from an executable."""
cmd = [executable, "-c", 'import sys; print(".".join(map(str, sys.version_info)))']
try:
result = subprocess.check_output(cmd, text=True)
except Exception as e:
raise ValueError(f"Error while executing command {cmd}: {e}")
return cls(*_parse_version_info(result.strip()))
class PythonOperator(BaseOperator):
"""
Executes a Python callable.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:PythonOperator`
When running your callable, Airflow will pass a set of keyword arguments that can be used in your
function. This set of kwargs correspond exactly to what you can use in your jinja templates.
For this to work, you need to define ``**kwargs`` in your function header, or you can add directly the
keyword arguments you would like to get - for example with the below code your callable will get
the values of ``ti`` and ``next_ds`` context variables.
With explicit arguments:
.. code-block:: python
def my_python_callable(ti, next_ds):
pass
With kwargs:
.. code-block:: python
def my_python_callable(**kwargs):
ti = kwargs["ti"]
next_ds = kwargs["next_ds"]
:param python_callable: A reference to an object that is callable
:param op_kwargs: a dictionary of keyword arguments that will get unpacked
in your function
:param op_args: a list of positional arguments that will get unpacked when
calling your callable
:param templates_dict: a dictionary where the values are templates that
will get templated by the Airflow engine sometime between
``__init__`` and ``execute`` takes place and are made available
in your callable's context after the template has been applied. (templated)
:param templates_exts: a list of file extensions to resolve while
processing templated fields, for examples ``['.sql', '.hql']``
:param show_return_value_in_logs: a bool value whether to show return_value
logs. Defaults to True, which allows return value log output.
It can be set to False to prevent log output of return value when you return huge data
such as transmission a large amount of XCom to TaskAPI.
"""
template_fields: Sequence[str] = ("templates_dict", "op_args", "op_kwargs")
template_fields_renderers = {"templates_dict": "json", "op_args": "py", "op_kwargs": "py"}
BLUE = "#ffefeb"
ui_color = BLUE
# since we won't mutate the arguments, we should just do the shallow copy
# there are some cases we can't deepcopy the objects(e.g protobuf).
shallow_copy_attrs: Sequence[str] = (
"python_callable",
"op_kwargs",
)
def __init__(
self,
*,
python_callable: Callable,
op_args: Collection[Any] | None = None,
op_kwargs: Mapping[str, Any] | None = None,
templates_dict: dict[str, Any] | None = None,
templates_exts: Sequence[str] | None = None,
show_return_value_in_logs: bool = True,
**kwargs,
) -> None:
if kwargs.get("provide_context"):
warnings.warn(
"provide_context is deprecated as of 2.0 and is no longer required",
RemovedInAirflow3Warning,
stacklevel=2,
)
kwargs.pop("provide_context", None)
super().__init__(**kwargs)
if not callable(python_callable):
raise AirflowException("`python_callable` param must be callable")
self.python_callable = python_callable
self.op_args = op_args or ()
self.op_kwargs = op_kwargs or {}
self.templates_dict = templates_dict
if templates_exts:
self.template_ext = templates_exts
self.show_return_value_in_logs = show_return_value_in_logs
def execute(self, context: Context) -> Any:
context_merge(context, self.op_kwargs, templates_dict=self.templates_dict)
self.op_kwargs = self.determine_kwargs(context)
self._dataset_events = context_get_outlet_events(context)
return_value = self.execute_callable()
if self.show_return_value_in_logs:
self.log.info("Done. Returned value was: %s", return_value)
else:
self.log.info("Done. Returned value not shown")
return return_value
def determine_kwargs(self, context: Mapping[str, Any]) -> Mapping[str, Any]:
return KeywordParameters.determine(self.python_callable, self.op_args, context).unpacking()
def execute_callable(self) -> Any:
"""
Call the python callable with the given arguments.
:return: the return value of the call.
"""
runner = ExecutionCallableRunner(self.python_callable, self._dataset_events, logger=self.log)
return runner.run(*self.op_args, **self.op_kwargs)
class BranchPythonOperator(PythonOperator, BranchMixIn):
"""
A workflow can "branch" or follow a path after the execution of this task.
It derives the PythonOperator and expects a Python function that returns
a single task_id or list of task_ids to follow. The task_id(s) returned
should point to a task directly downstream from {self}. All other "branches"
or directly downstream tasks are marked with a state of ``skipped`` so that
these paths can't move forward. The ``skipped`` states are propagated
downstream to allow for the DAG state to fill up and the DAG run's state
to be inferred.
"""
def execute(self, context: Context) -> Any:
return self.do_branch(context, super().execute(context))
class ShortCircuitOperator(PythonOperator, SkipMixin):
"""
Allows a pipeline to continue based on the result of a ``python_callable``.
The ShortCircuitOperator is derived from the PythonOperator and evaluates the result of a
``python_callable``. If the returned result is False or a falsy value, the pipeline will be
short-circuited. Downstream tasks will be marked with a state of "skipped" based on the short-circuiting
mode configured. If the returned result is True or a truthy value, downstream tasks proceed as normal and
an ``XCom`` of the returned result is pushed.
The short-circuiting can be configured to either respect or ignore the ``trigger_rule`` set for
downstream tasks. If ``ignore_downstream_trigger_rules`` is set to True, the default setting, all
downstream tasks are skipped without considering the ``trigger_rule`` defined for tasks. However, if this
parameter is set to False, the direct downstream tasks are skipped but the specified ``trigger_rule`` for
other subsequent downstream tasks are respected. In this mode, the operator assumes the direct downstream
tasks were purposely meant to be skipped but perhaps not other subsequent tasks.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:ShortCircuitOperator`
:param ignore_downstream_trigger_rules: If set to True, all downstream tasks from this operator task will
be skipped. This is the default behavior. If set to False, the direct, downstream task(s) will be
skipped but the ``trigger_rule`` defined for all other downstream tasks will be respected.
"""
def __init__(self, *, ignore_downstream_trigger_rules: bool = True, **kwargs) -> None:
super().__init__(**kwargs)
self.ignore_downstream_trigger_rules = ignore_downstream_trigger_rules
def execute(self, context: Context) -> Any:
condition = super().execute(context)
self.log.info("Condition result is %s", condition)
if condition:
self.log.info("Proceeding with downstream tasks...")
return condition
if not self.downstream_task_ids:
self.log.info("No downstream tasks; nothing to do.")
return condition
dag_run = context["dag_run"]
def get_tasks_to_skip():
if self.ignore_downstream_trigger_rules is True:
tasks = context["task"].get_flat_relatives(upstream=False)
else:
tasks = context["task"].get_direct_relatives(upstream=False)
for t in tasks:
if not t.is_teardown:
yield t
to_skip = get_tasks_to_skip()
# this let's us avoid an intermediate list unless debug logging
if self.log.getEffectiveLevel() <= logging.DEBUG:
self.log.debug("Downstream task IDs %s", to_skip := list(get_tasks_to_skip()))
self.log.info("Skipping downstream tasks")
self.skip(
dag_run=dag_run,
execution_date=cast("DateTime", dag_run.execution_date),
tasks=to_skip,
map_index=context["ti"].map_index,
)
self.log.info("Done.")
# returns the result of the super execute method as it is instead of returning None
return condition
def _load_pickle():
import pickle
return pickle
def _load_dill():
try:
import dill
except ModuleNotFoundError:
log.error("Unable to import `dill` module. Please please make sure that it installed.")
raise
return dill
def _load_cloudpickle():
try:
import cloudpickle
except ModuleNotFoundError:
log.error(
"Unable to import `cloudpickle` module. "
"Please install it with: pip install 'apache-airflow[cloudpickle]'"
)
raise
return cloudpickle
_SerializerTypeDef = Literal["pickle", "cloudpickle", "dill"]
_SERIALIZERS: dict[_SerializerTypeDef, Any] = {
"pickle": lazy_object_proxy.Proxy(_load_pickle),
"dill": lazy_object_proxy.Proxy(_load_dill),
"cloudpickle": lazy_object_proxy.Proxy(_load_cloudpickle),
}
class _BasePythonVirtualenvOperator(PythonOperator, metaclass=ABCMeta):
BASE_SERIALIZABLE_CONTEXT_KEYS = {
"ds",
"ds_nodash",
"expanded_ti_count",
"inlets",
"map_index_template",
"next_ds",
"next_ds_nodash",
"outlets",
"prev_ds",
"prev_ds_nodash",
"run_id",
"task_instance_key_str",
"test_mode",
"tomorrow_ds",
"tomorrow_ds_nodash",
"ts",
"ts_nodash",
"ts_nodash_with_tz",
"yesterday_ds",
"yesterday_ds_nodash",
}
PENDULUM_SERIALIZABLE_CONTEXT_KEYS = {
"data_interval_end",
"data_interval_start",
"execution_date",
"logical_date",
"next_execution_date",
"prev_data_interval_end_success",
"prev_data_interval_start_success",
"prev_execution_date",
"prev_execution_date_success",
"prev_start_date_success",
"prev_end_date_success",
}
AIRFLOW_SERIALIZABLE_CONTEXT_KEYS = {
"macros",
"conf",
"dag",
"dag_run",
"task",
"params",
"triggering_dataset_events",
}
def __init__(
self,
*,
python_callable: Callable,
serializer: _SerializerTypeDef | None = None,
op_args: Collection[Any] | None = None,
op_kwargs: Mapping[str, Any] | None = None,
string_args: Iterable[str] | None = None,
templates_dict: dict | None = None,
templates_exts: list[str] | None = None,
expect_airflow: bool = True,
skip_on_exit_code: int | Container[int] | None = None,
use_dill: bool = False,
**kwargs,
):
if (
not isinstance(python_callable, types.FunctionType)
or isinstance(python_callable, types.LambdaType)
and python_callable.__name__ == "<lambda>"
):
raise ValueError(f"{type(self).__name__} only supports functions for python_callable arg")
if inspect.isgeneratorfunction(python_callable):
raise ValueError(f"{type(self).__name__} does not support using 'yield' in python_callable")
super().__init__(
python_callable=python_callable,
op_args=op_args,
op_kwargs=op_kwargs,
templates_dict=templates_dict,
templates_exts=templates_exts,
**kwargs,
)
self.string_args = string_args or []
if use_dill:
warnings.warn(
"`use_dill` is deprecated and will be removed in a future version. "
"Please provide serializer='dill' instead.",
RemovedInAirflow3Warning,
stacklevel=3,
)
if serializer:
raise AirflowException(
"Both 'use_dill' and 'serializer' parameters are set. Please set only one of them"
)
serializer = "dill"
serializer = serializer or "pickle"
if serializer not in _SERIALIZERS:
msg = (
f"Unsupported serializer {serializer!r}. "
f"Expected one of {', '.join(map(repr, _SERIALIZERS))}"
)
raise AirflowException(msg)
self.pickling_library = _SERIALIZERS[serializer]
self.serializer: _SerializerTypeDef = serializer
self.expect_airflow = expect_airflow
self.skip_on_exit_code = (
skip_on_exit_code
if isinstance(skip_on_exit_code, Container)
else [skip_on_exit_code]
if skip_on_exit_code is not None
else []
)
@abstractmethod
def _iter_serializable_context_keys(self):
pass
def execute(self, context: Context) -> Any:
serializable_keys = set(self._iter_serializable_context_keys())
serializable_context = context_copy_partial(context, serializable_keys)
return super().execute(context=serializable_context)
def get_python_source(self):
"""Return the source of self.python_callable."""
return textwrap.dedent(inspect.getsource(self.python_callable))
def _write_args(self, file: Path):
if self.op_args or self.op_kwargs:
self.log.info("Use %r as serializer.", self.serializer)
file.write_bytes(self.pickling_library.dumps({"args": self.op_args, "kwargs": self.op_kwargs}))
def _write_string_args(self, file: Path):
file.write_text("\n".join(map(str, self.string_args)))
def _read_result(self, path: Path):
if path.stat().st_size == 0:
return None
try:
return self.pickling_library.loads(path.read_bytes())
except ValueError as value_error:
raise DeserializingResultError() from value_error
def __deepcopy__(self, memo):
# module objects can't be copied _at all__
memo[id(self.pickling_library)] = self.pickling_library
return super().__deepcopy__(memo)
def _execute_python_callable_in_subprocess(self, python_path: Path):
with TemporaryDirectory(prefix="venv-call") as tmp:
tmp_dir = Path(tmp)
op_kwargs: dict[str, Any] = dict(self.op_kwargs)
if self.templates_dict:
op_kwargs["templates_dict"] = self.templates_dict
input_path = tmp_dir / "script.in"
output_path = tmp_dir / "script.out"
string_args_path = tmp_dir / "string_args.txt"
script_path = tmp_dir / "script.py"
termination_log_path = tmp_dir / "termination.log"
self._write_args(input_path)
self._write_string_args(string_args_path)
jinja_context = {
"op_args": self.op_args,
"op_kwargs": op_kwargs,
"expect_airflow": self.expect_airflow,
"pickling_library": self.serializer,
"python_callable": self.python_callable.__name__,
"python_callable_source": self.get_python_source(),
}
if inspect.getfile(self.python_callable) == self.dag.fileloc:
jinja_context["modified_dag_module_name"] = get_unique_dag_module_name(self.dag.fileloc)
write_python_script(
jinja_context=jinja_context,
filename=os.fspath(script_path),
render_template_as_native_obj=self.dag.render_template_as_native_obj,
)
try:
execute_in_subprocess(
cmd=[
os.fspath(python_path),
os.fspath(script_path),
os.fspath(input_path),
os.fspath(output_path),
os.fspath(string_args_path),
os.fspath(termination_log_path),
]
)
except subprocess.CalledProcessError as e:
if e.returncode in self.skip_on_exit_code:
raise AirflowSkipException(f"Process exited with code {e.returncode}. Skipping.")
elif termination_log_path.exists() and termination_log_path.stat().st_size > 0:
error_msg = f"Process returned non-zero exit status {e.returncode}.\n"
with open(termination_log_path) as file:
error_msg += file.read()
raise AirflowException(error_msg) from None
else:
raise
if 0 in self.skip_on_exit_code:
raise AirflowSkipException("Process exited with code 0. Skipping.")
return self._read_result(output_path)
def determine_kwargs(self, context: Mapping[str, Any]) -> Mapping[str, Any]:
return KeywordParameters.determine(self.python_callable, self.op_args, context).serializing()
class PythonVirtualenvOperator(_BasePythonVirtualenvOperator):
"""
Run a function in a virtualenv that is created and destroyed automatically.
The function (has certain caveats) must be defined using def, and not be
part of a class. All imports must happen inside the function
and no variables outside the scope may be referenced. A global scope
variable named virtualenv_string_args will be available (populated by
string_args). In addition, one can pass stuff through op_args and op_kwargs, and one
can use a return value.
Note that if your virtualenv runs in a different Python major version than Airflow,
you cannot use return values, op_args, op_kwargs, or use any macros that are being provided to
Airflow through plugins. You can use string_args though.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:PythonVirtualenvOperator`
:param python_callable: A python function with no references to outside variables,
defined with def, which will be run in a virtual environment.
:param requirements: Either a list of requirement strings, or a (templated)
"requirements file" as specified by pip.
:param python_version: The Python version to run the virtual environment with. Note that
both 2 and 2.7 are acceptable forms.
:param serializer: Which serializer use to serialize the args and result. It can be one of the following:
- ``"pickle"``: (default) Use pickle for serialization. Included in the Python Standard Library.
- ``"cloudpickle"``: Use cloudpickle for serialize more complex types,
this requires to include cloudpickle in your requirements.
- ``"dill"``: Use dill for serialize more complex types,
this requires to include dill in your requirements.
:param system_site_packages: Whether to include
system_site_packages in your virtual environment.
See virtualenv documentation for more information.
:param pip_install_options: a list of pip install options when installing requirements
See 'pip install -h' for available options
:param op_args: A list of positional arguments to pass to python_callable.
:param op_kwargs: A dict of keyword arguments to pass to python_callable.
:param string_args: Strings that are present in the global var virtualenv_string_args,
available to python_callable at runtime as a list[str]. Note that args are split
by newline.
:param templates_dict: a dictionary where the values are templates that
will get templated by the Airflow engine sometime between
``__init__`` and ``execute`` takes place and are made available
in your callable's context after the template has been applied
:param templates_exts: a list of file extensions to resolve while
processing templated fields, for examples ``['.sql', '.hql']``
:param expect_airflow: expect Airflow to be installed in the target environment. If true, the operator
will raise warning if Airflow is not installed, and it will attempt to load Airflow
macros when starting.
:param skip_on_exit_code: If python_callable exits with this exit code, leave the task
in ``skipped`` state (default: None). If set to ``None``, any non-zero
exit code will be treated as a failure.
:param index_urls: an optional list of index urls to load Python packages from.
If not provided the system pip conf will be used to source packages from.
:param venv_cache_path: Optional path to the virtual environment parent folder in which the
virtual environment will be cached, creates a sub-folder venv-{hash} whereas hash will be replaced
with a checksum of requirements. If not provided the virtual environment will be created and deleted
in a temp folder for every execution.
:param use_dill: Deprecated, use ``serializer`` instead. Whether to use dill to serialize
the args and result (pickle is default). This allows more complex types
but requires you to include dill in your requirements.
"""
template_fields: Sequence[str] = tuple(
{"requirements", "index_urls", "venv_cache_path"}.union(PythonOperator.template_fields)
)
template_ext: Sequence[str] = (".txt",)
def __init__(
self,
*,
python_callable: Callable,
requirements: None | Iterable[str] | str = None,
python_version: str | None = None,
serializer: _SerializerTypeDef | None = None,
system_site_packages: bool = True,
pip_install_options: list[str] | None = None,
op_args: Collection[Any] | None = None,
op_kwargs: Mapping[str, Any] | None = None,
string_args: Iterable[str] | None = None,
templates_dict: dict | None = None,
templates_exts: list[str] | None = None,
expect_airflow: bool = True,
skip_on_exit_code: int | Container[int] | None = None,
index_urls: None | Collection[str] | str = None,
venv_cache_path: None | os.PathLike[str] = None,
use_dill: bool = False,
**kwargs,
):
if (
python_version
and str(python_version)[0] != str(sys.version_info.major)
and (op_args or op_kwargs)
):
raise AirflowException(
"Passing op_args or op_kwargs is not supported across different Python "
"major versions for PythonVirtualenvOperator. Please use string_args."
f"Sys version: {sys.version_info}. Virtual environment version: {python_version}"
)
if python_version is not None and not isinstance(python_version, str):
warnings.warn(
"Passing non-string types (e.g. int or float) as python_version "
"is deprecated. Please use string value instead.",
RemovedInAirflow3Warning,
stacklevel=2,
)
if not is_venv_installed():
raise AirflowException("PythonVirtualenvOperator requires virtualenv, please install it.")
if not requirements:
self.requirements: list[str] = []
elif isinstance(requirements, str):
self.requirements = [requirements]
else:
self.requirements = list(requirements)
self.python_version = python_version
self.system_site_packages = system_site_packages
self.pip_install_options = pip_install_options
if isinstance(index_urls, str):
self.index_urls: list[str] | None = [index_urls]
elif isinstance(index_urls, Collection):
self.index_urls = list(index_urls)
else:
self.index_urls = None
self.venv_cache_path = venv_cache_path
super().__init__(
python_callable=python_callable,
serializer=serializer,
op_args=op_args,
op_kwargs=op_kwargs,
string_args=string_args,
templates_dict=templates_dict,
templates_exts=templates_exts,
expect_airflow=expect_airflow,
skip_on_exit_code=skip_on_exit_code,
use_dill=use_dill,
**kwargs,
)
def _requirements_list(self, exclude_cloudpickle: bool = False) -> list[str]:
"""Prepare a list of requirements that need to be installed for the virtual environment."""
requirements = [str(dependency) for dependency in self.requirements]
if not self.system_site_packages:
if (
self.serializer == "cloudpickle"
and not exclude_cloudpickle
and "cloudpickle" not in requirements
):
requirements.append("cloudpickle")
elif self.serializer == "dill" and "dill" not in requirements:
requirements.append("dill")
requirements.sort() # Ensure a hash is stable
return requirements
def _prepare_venv(self, venv_path: Path) -> None:
"""Prepare the requirements and installs the virtual environment."""
requirements_file = venv_path / "requirements.txt"
requirements_file.write_text("\n".join(self._requirements_list()))
prepare_virtualenv(
venv_directory=str(venv_path),
python_bin=f"python{self.python_version}" if self.python_version else "python",
system_site_packages=self.system_site_packages,
requirements_file_path=str(requirements_file),
pip_install_options=self.pip_install_options,
index_urls=self.index_urls,
)
def _calculate_cache_hash(self, exclude_cloudpickle: bool = False) -> tuple[str, str]:
"""Generate the hash of the cache folder to use.
The following factors are used as input for the hash:
- (sorted) list of requirements
- pip install options
- flag of system site packages
- python version
- Variable to override the hash with a cache key
- Index URLs
Returns a hash and the data dict which is the base for the hash as text.
"""
hash_dict = {
"requirements_list": self._requirements_list(exclude_cloudpickle=exclude_cloudpickle),
"pip_install_options": self.pip_install_options,
"index_urls": self.index_urls,
"cache_key": str(Variable.get("PythonVirtualenvOperator.cache_key", "")),
"python_version": self.python_version,
"system_site_packages": self.system_site_packages,
}
hash_text = json.dumps(hash_dict, sort_keys=True)
hash_object = hashlib_wrapper.md5(hash_text.encode())
requirements_hash = hash_object.hexdigest()
return requirements_hash[:8], hash_text
def _ensure_venv_cache_exists(self, venv_cache_path: Path) -> Path:
"""Ensure a valid virtual environment is set up and will create inplace."""
cache_hash, hash_data = self._calculate_cache_hash()
venv_path = venv_cache_path / f"venv-{cache_hash}"
self.log.info("Python virtual environment will be cached in %s", venv_path)
venv_path.parent.mkdir(parents=True, exist_ok=True)
with open(f"{venv_path}.lock", "w") as f:
# Ensure that cache is not build by parallel workers
fcntl.flock(f, fcntl.LOCK_EX)
hash_marker = venv_path / "install_complete_marker.json"
try:
if venv_path.exists():
if hash_marker.exists():
previous_hash_data = hash_marker.read_text(encoding="utf8")
if previous_hash_data == hash_data:
self.log.info("Re-using cached Python virtual environment in %s", venv_path)
return venv_path
_, hash_data_before_upgrade = self._calculate_cache_hash(exclude_cloudpickle=True)
if previous_hash_data == hash_data_before_upgrade:
self.log.warning(
"Found a previous virtual environment in with outdated dependencies %s, "
"deleting and re-creating.",
venv_path,
)
else:
self.log.error(
"Unicorn alert: Found a previous virtual environment in %s "
"with the same hash but different parameters. Previous setup: '%s' / "
"Requested venv setup: '%s'. Please report a bug to airflow!",
venv_path,
previous_hash_data,
hash_data,
)
else:
self.log.warning(
"Found a previous (probably partial installed) virtual environment in %s, "
"deleting and re-creating.",
venv_path,
)
shutil.rmtree(venv_path)
venv_path.mkdir(parents=True)
self._prepare_venv(venv_path)
hash_marker.write_text(hash_data, encoding="utf8")
except Exception as e:
shutil.rmtree(venv_path)
raise AirflowException(f"Unable to create new virtual environment in {venv_path}") from e
self.log.info("New Python virtual environment created in %s", venv_path)
return venv_path
def execute_callable(self):
if self.venv_cache_path:
venv_path = self._ensure_venv_cache_exists(Path(self.venv_cache_path))
python_path = venv_path / "bin" / "python"
return self._execute_python_callable_in_subprocess(python_path)
with TemporaryDirectory(prefix="venv") as tmp_dir:
tmp_path = Path(tmp_dir)
self._prepare_venv(tmp_path)
python_path = tmp_path / "bin" / "python"
result = self._execute_python_callable_in_subprocess(python_path)
return result
def _iter_serializable_context_keys(self):
yield from self.BASE_SERIALIZABLE_CONTEXT_KEYS
if self.system_site_packages or "apache-airflow" in self.requirements:
yield from self.AIRFLOW_SERIALIZABLE_CONTEXT_KEYS
yield from self.PENDULUM_SERIALIZABLE_CONTEXT_KEYS
elif "pendulum" in self.requirements:
yield from self.PENDULUM_SERIALIZABLE_CONTEXT_KEYS
class BranchPythonVirtualenvOperator(PythonVirtualenvOperator, BranchMixIn):
"""
A workflow can "branch" or follow a path after the execution of this task in a virtual environment.
It derives the PythonVirtualenvOperator and expects a Python function that returns
a single task_id or list of task_ids to follow. The task_id(s) returned
should point to a task directly downstream from {self}. All other "branches"
or directly downstream tasks are marked with a state of ``skipped`` so that
these paths can't move forward. The ``skipped`` states are propagated
downstream to allow for the DAG state to fill up and the DAG run's state
to be inferred.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:BranchPythonVirtualenvOperator`
"""
def execute(self, context: Context) -> Any:
return self.do_branch(context, super().execute(context))
class ExternalPythonOperator(_BasePythonVirtualenvOperator):
"""
Run a function in a virtualenv that is not re-created.
Reused as is without the overhead of creating the virtual environment (with certain caveats).
The function must be defined using def, and not be
part of a class. All imports must happen inside the function
and no variables outside the scope may be referenced. A global scope
variable named virtualenv_string_args will be available (populated by
string_args). In addition, one can pass stuff through op_args and op_kwargs, and one
can use a return value.
Note that if your virtual environment runs in a different Python major version than Airflow,
you cannot use return values, op_args, op_kwargs, or use any macros that are being provided to
Airflow through plugins. You can use string_args though.
If Airflow is installed in the external environment in different version that the version
used by the operator, the operator will fail.,
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:ExternalPythonOperator`
:param python: Full path string (file-system specific) that points to a Python binary inside
a virtual environment that should be used (in ``VENV/bin`` folder). Should be absolute path
(so usually start with "/" or "X:/" depending on the filesystem/os used).
:param python_callable: A python function with no references to outside variables,
defined with def, which will be run in a virtual environment.
:param serializer: Which serializer use to serialize the args and result. It can be one of the following:
- ``"pickle"``: (default) Use pickle for serialization. Included in the Python Standard Library.
- ``"cloudpickle"``: Use cloudpickle for serialize more complex types,
this requires to include cloudpickle in your requirements.
- ``"dill"``: Use dill for serialize more complex types,
this requires to include dill in your requirements.
:param op_args: A list of positional arguments to pass to python_callable.
:param op_kwargs: A dict of keyword arguments to pass to python_callable.
:param string_args: Strings that are present in the global var virtualenv_string_args,
available to python_callable at runtime as a list[str]. Note that args are split
by newline.
:param templates_dict: a dictionary where the values are templates that
will get templated by the Airflow engine sometime between
``__init__`` and ``execute`` takes place and are made available
in your callable's context after the template has been applied
:param templates_exts: a list of file extensions to resolve while
processing templated fields, for examples ``['.sql', '.hql']``
:param expect_airflow: expect Airflow to be installed in the target environment. If true, the operator
will raise warning if Airflow is not installed, and it will attempt to load Airflow
macros when starting.
:param skip_on_exit_code: If python_callable exits with this exit code, leave the task
in ``skipped`` state (default: None). If set to ``None``, any non-zero
exit code will be treated as a failure.
:param use_dill: Deprecated, use ``serializer`` instead. Whether to use dill to serialize
the args and result (pickle is default). This allows more complex types
but requires you to include dill in your requirements.
"""
template_fields: Sequence[str] = tuple({"python"}.union(PythonOperator.template_fields))
def __init__(
self,
*,
python: str,
python_callable: Callable,
serializer: _SerializerTypeDef | None = None,
op_args: Collection[Any] | None = None,
op_kwargs: Mapping[str, Any] | None = None,
string_args: Iterable[str] | None = None,
templates_dict: dict | None = None,
templates_exts: list[str] | None = None,
expect_airflow: bool = True,
expect_pendulum: bool = False,
skip_on_exit_code: int | Container[int] | None = None,
use_dill: bool = False,
**kwargs,
):
if not python:
raise ValueError("Python Path must be defined in ExternalPythonOperator")
self.python = python
self.expect_pendulum = expect_pendulum
super().__init__(
python_callable=python_callable,
serializer=serializer,
op_args=op_args,
op_kwargs=op_kwargs,
string_args=string_args,
templates_dict=templates_dict,
templates_exts=templates_exts,
expect_airflow=expect_airflow,
skip_on_exit_code=skip_on_exit_code,
use_dill=use_dill,
**kwargs,
)
def execute_callable(self):
python_path = Path(self.python)
if not python_path.exists():
raise ValueError(f"Python Path '{python_path}' must exists")
if not python_path.is_file():
raise ValueError(f"Python Path '{python_path}' must be a file")
if not python_path.is_absolute():
raise ValueError(f"Python Path '{python_path}' must be an absolute path.")
python_version = _PythonVersionInfo.from_executable(self.python)
if python_version.major != sys.version_info.major and (self.op_args or self.op_kwargs):
raise AirflowException(
"Passing op_args or op_kwargs is not supported across different Python "
"major versions for ExternalPythonOperator. Please use string_args."
f"Sys version: {sys.version_info}. "
f"Virtual environment version: {python_version}"
)
return self._execute_python_callable_in_subprocess(python_path)
def _iter_serializable_context_keys(self):
yield from self.BASE_SERIALIZABLE_CONTEXT_KEYS
if self._get_airflow_version_from_target_env():
yield from self.AIRFLOW_SERIALIZABLE_CONTEXT_KEYS
yield from self.PENDULUM_SERIALIZABLE_CONTEXT_KEYS
elif self._is_pendulum_installed_in_target_env():
yield from self.PENDULUM_SERIALIZABLE_CONTEXT_KEYS
def _is_pendulum_installed_in_target_env(self) -> bool: