def signal_update(self):
if not self._signal_update_fn:
logger.info('No signal update function set.')
return
try:
self._signal_update_fn()
except Exception:
logger.exception("Failed to signal update.")
increment_counter(_METRIC_SIGNAL_UPDATE_EXCEPTION)
def signal_update(self):
if not self._signal_update_fn:
logger.info('No signal update function set.')
return
try:
self._signal_update_fn()
except Exception:
logger.exception("Failed to signal update.")
increment_counter(_METRIC_SIGNAL_UPDATE_EXCEPTION)
def _try_update(self, as_of=None):
try:
increment_counter(_METRIC_UPDATE_ATTEMPTED)
if not as_of:
as_of = datetime.now()
do_update = self._should_update(as_of)
if do_update:
self._needs_update = False
self._updating = True
try:
self._update(restart_proxy=True)
except Exception:
logger.exception('Failed to update configuration.')
finally:
self._updating = False
except Exception:
increment_counter(_METRIC_UPDATE_ATTEMPT_FAILED)
logger.exception('Error updating.')
def _try_update(self, as_of=None):
try:
increment_counter(_METRIC_UPDATE_ATTEMPTED)
if not as_of:
as_of = datetime.now()
do_update = self._should_update(as_of)
if do_update:
self._needs_update = False
self._updating= True
try:
self._update(restart_proxy=True)
except Exception:
logger.exception('Failed to update configuration.')
finally:
self._updating = False
except Exception:
increment_counter(_METRIC_UPDATE_ATTEMPT_FAILED)
logger.exception('Error updating.')
def _update(self, config, config_dest, restart_proxy):
if not self._should_update_config(config, config_dest):
logger.info('No update required.')
return True
self._backup(config_dest)
revert = False
try:
logger.info('Writing new configuration.')
logger.info(config)
with open(config_dest, 'w') as updated_config:
updated_config.write(config)
increment_counter(_METRIC_UPDATE_SUCCEEDED)
if restart_proxy:
logger.info('Applying new configuration.')
self.restart()
except Exception:
logger.exception('Writing new configuration failed.')
revert = True
finally:
if revert:
logger.error('Validation of new configuration failed!')
logger.warning('Reverting to %s', self._build_backup_path(config_dest))
try:
self._revert(config_dest)
increment_counter(_METRIC_REVERT_SUCCEEDED)
except Exception:
logger.exception('Attempt to revert to old configuration failed!')
increment_counter(_METRIC_REVERT_FAILED)
return not revert
def _update(self, config, config_dest, restart_proxy):
if not self._should_update_config(config, config_dest):
logger.info('No update required.')
return True
self._backup(config_dest)
revert = False
try:
logger.info('Writing new configuration.')
logger.info(config)
with open(config_dest, 'w') as updated_config:
updated_config.write(config)
increment_counter(_METRIC_UPDATE_SUCCEEDED)
if restart_proxy:
logger.info('Applying new configuration.')
self.restart()
except Exception:
logger.exception('Writing new configuration failed.')
revert = True
finally:
if revert:
logger.error('Validation of new configuration failed!')
logger.warning('Reverting to %s',
self._build_backup_path(config_dest))
try:
self._revert(config_dest)
increment_counter(_METRIC_REVERT_SUCCEEDED)
except Exception:
logger.exception(
'Attempt to revert to old configuration failed!')
increment_counter(_METRIC_REVERT_FAILED)
return not revert
