a359444556
- Removed event listener python script, removed supervisor conf for the same. - Added new python script to handle the starting page init. - Python script will be called via a shell script with a failsafe removal of the loading page. - The above shell script will be run as a child of the run java script Tests: The child script exits after execution, and does not create zombie process even when the run java script is called multiple times with restarts. Verified exceptions and failsafe manually by introducing syntax errors and uninstalling requests module. --------- Co-authored-by: Shrikant Sharat Kandula <shrikant@appsmith.com>
81 lines
2.3 KiB
Python
81 lines
2.3 KiB
Python
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import os
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import sys
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import time
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import shutil
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import subprocess
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import logging
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import traceback
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import atexit
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LOADING_TEMPLATE_PAGE = r'/opt/appsmith/templates/appsmith_starting.html'
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LOADING_PAGE_EDITOR = r'/opt/appsmith/editor/loading.html'
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BACKEND_HEALTH_ENDPOINT = "http://localhost:8080/api/v1/health"
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LOG_FILE = r'/appsmith-stacks/logs/backend/starting_page_init.log'
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LOG_FORMAT = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
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logging.basicConfig(filename = LOG_FILE, level = logging.NOTSET, format = LOG_FORMAT)
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try:
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import requests
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except ModuleNotFoundError as e:
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logging.error("Module Not Found: " , e)
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def get_backend_status():
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try:
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return subprocess.getoutput("supervisorctl status backend").split()[1]
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except subprocess.CalledProcessError as e:
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logging.error("Subprocess Error ", e)
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except ValueError as e:
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logging.error("Value Error ", e)
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def check_health_endpoint(url,sleep_sec = 3,timeout_sec = 180):
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for _ in range(timeout_sec//sleep_sec):
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try:
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if requests.get(url).ok:
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logging.info('Backend health check successful.')
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break
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except ImportError as e:
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logging.error("Import Error: ", e)
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sys.exit(1)
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except requests.RequestException:
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pass # retry after sleep_sec
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finally:
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time.sleep(sleep_sec)
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if get_backend_status() in ('FATAL' , 'BACKOFF'):
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break
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else:
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logging.error('Timeout Error: Backend health check timeout.')
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def remove_loading_page():
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retries = 3
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for _ in range(retries):
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try:
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if os.path.exists(LOADING_PAGE_EDITOR):
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os.remove(LOADING_PAGE_EDITOR)
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break
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except OSError as e:
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logging.error("Failed to remove loading page ", e)
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time.sleep(1)
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else:
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logging.error("Loading page removal failed after %i retries. Trying again one final time.", retries)
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logging.info(subprocess.getoutput("rm -fv " + LOADING_PAGE_EDITOR))
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def add_loading_page():
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shutil.copyfile(LOADING_TEMPLATE_PAGE, LOADING_PAGE_EDITOR)
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@atexit.register
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def failsafe():
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remove_loading_page()
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def main():
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add_loading_page()
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check_health_endpoint(BACKEND_HEALTH_ENDPOINT)
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remove_loading_page()
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if __name__ == '__main__':
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main()
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