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# Copyright 2020 Google Inc.
#
# 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.
#
################################################################################
"""Utility functions for testing cloud functions."""
import os
import subprocess
import threading
import requests
DATASTORE_READY_INDICATOR = b'is now running'
DATASTORE_EMULATOR_PORT = 8432
EMULATOR_TIMEOUT = 20
TEST_PROJECT_ID = 'test-project'
def start_datastore_emulator():
"""Start Datastore emulator."""
return subprocess.Popen([
'gcloud',
'beta',
'emulators',
'datastore',
'start',
'--consistency=1.0',
'--host-port=localhost:' + str(DATASTORE_EMULATOR_PORT),
'--project=' + TEST_PROJECT_ID,
'--no-store-on-disk',
],
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT)
def wait_for_emulator_ready(proc,
emulator,
indicator,
timeout=EMULATOR_TIMEOUT):
"""Wait for emulator to be ready."""
def _read_thread(proc, ready_event):
"""Thread to continuously read from the process stdout."""
ready = False
while True:
line = proc.stdout.readline()
if not line:
break
if not ready and indicator in line:
ready = True
ready_event.set()
# Wait for process to become ready.
ready_event = threading.Event()
thread = threading.Thread(target=_read_thread, args=(proc, ready_event))
thread.daemon = True
thread.start()
if not ready_event.wait(timeout):
raise RuntimeError(
'{} emulator did not get ready in time.'.format(emulator))
return thread
def reset_ds_emulator():
"""Reset ds emulator/clean all entities."""
req = requests.post(
'http://localhost:{}/reset'.format(DATASTORE_EMULATOR_PORT))
req.raise_for_status()
def cleanup_emulator(ds_emulator):
"""Cleanup the system processes made by ds emulator."""
del ds_emulator #To do, find a better way to cleanup emulator
os.system('pkill -f datastore')
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