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78 lines
2.8 KiB
Python
78 lines
2.8 KiB
Python
#!/usr/bin/env python3
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"""
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Certificate watcher which reloads nginx or reconfigures it, depending on what
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happens to externally supplied certificates. Only executed by start.py in case
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of TLS_FLAVOR=[mail, cert]
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"""
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from os.path import exists, split as path_split, join as path_join
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from os import system, getenv
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import time
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from watchdog.observers.polling import PollingObserver
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from watchdog.events import FileSystemEventHandler, FileDeletedEvent, \
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FileCreatedEvent, FileModifiedEvent, FileMovedEvent
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class ChangeHandler(FileSystemEventHandler):
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"watchdog-handler listening on any event, executing the correct configuration/reload steps"
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def __init__(self, cert_path, keypair_path):
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"Initialize a new changehandler"""
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super().__init__()
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self.cert_path = cert_path
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self.keypair_path = keypair_path
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@staticmethod
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def reload_nginx():
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"merely reload nginx without re-configuring everything"
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if exists("/var/run/nginx.pid"):
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print("Reloading a running nginx")
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system("nginx -s reload")
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@staticmethod
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def reexec_config():
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"execute a reconfiguration of the system, which also reloads"
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print("Reconfiguring system")
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system("/config.py")
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def on_any_event(self, event):
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"event-listener checking if the affected files are the cert-files we're interested in"
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if event.is_directory:
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return
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filename = event.src_path
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if isinstance(event, FileMovedEvent):
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filename = event.dest_path
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if filename in [self.cert_path, self.keypair_path]:
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# all cases except for FileModified need re-configure
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if isinstance(event, (FileCreatedEvent, FileMovedEvent, FileDeletedEvent)):
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ChangeHandler.reexec_config()
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# file modification needs only a nginx reload without config.py
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elif isinstance(event, FileModifiedEvent):
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ChangeHandler.reload_nginx()
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# cert files have been moved away, re-configure
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elif isinstance(event, FileMovedEvent) and event.src_path in [self.cert_path, self.keypair_path]:
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ChangeHandler.reexec_config()
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if __name__ == '__main__':
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cert_path = path_join("/certs/", getenv("TLS_CERT_FILENAME", default="cert.pem"))
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cert_dir = path_split(cert_path)[0]
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keypair_path = path_join("/certs/", getenv("TLS_KEYPAIR_FILENAME", default="key.pem"))
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keypair_dir = path_split(keypair_path)[0]
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observer = PollingObserver()
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handler = ChangeHandler(cert_path, keypair_path)
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observer.schedule(handler, cert_dir, recursive=False)
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if keypair_dir != cert_dir:
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observer.schedule(handler, keypair_dir, recursive=False)
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observer.start()
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try:
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while True:
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time.sleep(1)
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except KeyboardInterrupt:
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observer.stop()
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observer.join()
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