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generate_event.py
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144 lines (136 loc) · 6.66 KB
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# 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 datetime import datetime
import pytz
import apache_beam as beam
from apache_beam.testing.test_stream import TestStream
class GenerateEvent(beam.PTransform):
# pylint: disable=line-too-long
"""This class simulates streaming data.
It leverages [TestStream](https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/testing/TestStream.html),
a method where you can control when data arrives and how watermark advances.
This is especially useful in unit tests.""" # noqa
@staticmethod
def sample_data():
return GenerateEvent()
def expand(self, input):
# these are the elements that will arrive in the simulated TestStream
# at multiple timestamps
elem = [{'age': 10}, {'age': 20}, {'age': 30}]
# The simulated TestStream adds elements at specific timestamps
# using add_elements and advances the watermark after 1 or more
# elements are arrive using advance_watermark_to
return (
input
| TestStream().add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 1, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 2, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 3, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 4, 0,
tzinfo=pytz.UTC).timestamp()).
advance_watermark_to(
datetime(2021, 3, 1, 0, 0, 5, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 5, 0,
tzinfo=pytz.UTC).timestamp()).
add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 6,
0, tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 7, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 8, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 9, 0,
tzinfo=pytz.UTC).timestamp()).
advance_watermark_to(
datetime(2021, 3, 1, 0, 0, 10, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 10, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 11, 0,
tzinfo=pytz.UTC).timestamp()).
add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 12, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 13, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 14, 0,
tzinfo=pytz.UTC).timestamp()).
advance_watermark_to(
datetime(2021, 3, 1, 0, 0, 15, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 15, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 16, 0,
tzinfo=pytz.UTC).timestamp()).
add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 17, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 18, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 19, 0,
tzinfo=pytz.UTC).timestamp()).
advance_watermark_to(
datetime(2021, 3, 1, 0, 0, 20, 0,
tzinfo=pytz.UTC).timestamp()).add_elements(
elements=elem,
event_timestamp=datetime(
2021, 3, 1, 0, 0, 20, 0,
tzinfo=pytz.UTC).timestamp()).advance_watermark_to(
datetime(
2021, 3, 1, 0, 0, 25, 0, tzinfo=pytz.UTC).
timestamp()).advance_watermark_to_infinity())