126 lines
3.4 KiB
Python
Executable File
126 lines
3.4 KiB
Python
Executable File
#!/usr/bin/env python3
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"""
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Settings for journal-postfix.
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"""
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import os
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import datetime
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from typing import Union, Optional
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from systemd import journal
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from yaml import load
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main_config_file: str = '/etc/journal-postfix/main.yml'
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"""
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Filepath to the main config file.
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Can be overriden by environment variable JOURNAL_POSTFIX_MAIN_CONF.
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"""
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systemd_unitname: str = 'postfix@-.service'
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"""
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Name of the systemd unit running the postfix service.
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"""
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journal_poll_interval: Union[float, int] = 10.0
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"""
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Poll timeout in seconds for fetching messages from the journal.
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Will be overriden if set in the main config.
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If the poll times out, it is checked whether the last commit
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lies more than max_delay_before_commit seconds in the past;
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if so, the current database transaction will be committed.
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"""
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max_delay_before_commit: datetime.timedelta = datetime.timedelta(seconds=30)
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"""
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How much time may pass before committing a database transaction?
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Will be overriden if set in the main config.
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(The actual maximal delay can be one journal_poll_interval in addition.)
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"""
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max_messages_per_commit: int = 1000
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"""
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How many messages to cache at most before committing a database transaction?
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Will be overriden if set in the main config.
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"""
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delete_deliveries_after_days: int = 0
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"""
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After how many days shall deliveries be deleted from the database?
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A value of 0 means that data are never deleted.
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"""
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def get_config() -> Optional[dict]:
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"""
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Load config from the main config and return it.
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The default main config file path (global main_config_file)
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can be overriden with environment variable
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JOURNAL_POSTFIX_MAIN_CONF.
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"""
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try:
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filename = os.environ['JOURNAL_POSTFIX_MAIN_CONF']
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global main_config_file
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main_config_file = filename
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except Exception:
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filename = main_config_file
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try:
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with open(filename, 'r') as config_file:
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config_raw = config_file.read()
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except Exception:
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msg = f'ERROR: cannot read config file {filename}'
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journal.send(msg, PRIORITY=journal.LOG_CRIT)
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return None
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try:
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config = load(config_raw)
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except Exception as err:
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msg = f'ERROR: invalid yaml syntax in {filename}: {err}'
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journal.send(msg, PRIORITY=journal.LOG_CRIT)
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return None
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# override some global variables
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_global_value_from_config(config['postfix'], 'systemd_unitname', str)
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_global_value_from_config(config, 'journal_poll_interval', float)
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_global_value_from_config(config, 'max_delay_before_commit', 'seconds')
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_global_value_from_config(config, 'max_messages_per_commit', int)
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_global_value_from_config(config, 'delete_deliveries_after_days', int)
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_global_value_from_config(config, 'delete_interval', 'seconds')
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return config
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def _global_value_from_config(
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config, name: str, type_: Union[type, str]
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) -> None:
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"""
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Set a global variable to the value obtained from *config*.
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Also cast to *type_*.
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"""
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try:
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value = config.get(name)
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if type_ == 'seconds':
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value = datetime.timedelta(seconds=float(value))
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else:
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value = type_(value) # type: ignore
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globals()[name] = value
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except Exception:
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if value is not None:
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msg = f'ERROR: configured value of {name} is invalid.'
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journal.send(msg, PRIORITY=journal.LOG_ERR)
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if __name__ == '__main__':
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print(get_config())
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