forked from borgmatic-collective/borgmatic
101 lines
3.2 KiB
Python
101 lines
3.2 KiB
Python
import logging
|
|
|
|
import requests
|
|
|
|
from borgmatic.hooks import monitor
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
MONITOR_STATE_TO_HEALTHCHECKS = {
|
|
monitor.State.START: 'start',
|
|
monitor.State.FINISH: None, # Healthchecks doesn't append to the URL for the finished state.
|
|
monitor.State.FAIL: 'fail',
|
|
}
|
|
|
|
PAYLOAD_TRUNCATION_INDICATOR = '...\n'
|
|
PAYLOAD_LIMIT_BYTES = 10 * 1024 - len(PAYLOAD_TRUNCATION_INDICATOR)
|
|
|
|
|
|
class Forgetful_buffering_handler(logging.Handler):
|
|
'''
|
|
A buffering log handler that stores log messages in memory, and throws away messages (oldest
|
|
first) once a particular capacity in bytes is reached.
|
|
'''
|
|
|
|
def __init__(self, byte_capacity):
|
|
super().__init__()
|
|
|
|
self.byte_capacity = byte_capacity
|
|
self.byte_count = 0
|
|
self.buffer = []
|
|
self.forgot = False
|
|
|
|
def emit(self, record):
|
|
message = record.getMessage() + '\n'
|
|
self.byte_count += len(message)
|
|
self.buffer.append(message)
|
|
|
|
while self.byte_count > self.byte_capacity and self.buffer:
|
|
self.byte_count -= len(self.buffer[0])
|
|
self.buffer.pop(0)
|
|
self.forgot = True
|
|
|
|
|
|
def format_buffered_logs_for_payload():
|
|
'''
|
|
Get the handler previously added to the root logger, and slurp buffered logs out of it to
|
|
send to Healthchecks.
|
|
'''
|
|
try:
|
|
buffering_handler = next(
|
|
handler
|
|
for handler in logging.getLogger().handlers
|
|
if isinstance(handler, Forgetful_buffering_handler)
|
|
)
|
|
except StopIteration:
|
|
# No handler means no payload.
|
|
return ''
|
|
|
|
payload = ''.join(message for message in buffering_handler.buffer)
|
|
|
|
if buffering_handler.forgot:
|
|
return PAYLOAD_TRUNCATION_INDICATOR + payload
|
|
|
|
return payload
|
|
|
|
|
|
def ping_monitor(ping_url_or_uuid, config_filename, state, dry_run):
|
|
'''
|
|
Ping the given Healthchecks URL or UUID, modified with the monitor.State. Use the given
|
|
configuration filename in any log entries. If this is a dry run, then don't actually ping
|
|
anything.
|
|
'''
|
|
if state is monitor.State.START:
|
|
# Add a handler to the root logger that stores in memory the most recent logs emitted. That
|
|
# way, we can send them all to Healthchecks upon a finish or failure state.
|
|
logging.getLogger().addHandler(Forgetful_buffering_handler(PAYLOAD_LIMIT_BYTES))
|
|
payload = ''
|
|
|
|
ping_url = (
|
|
ping_url_or_uuid
|
|
if ping_url_or_uuid.startswith('http')
|
|
else 'https://hc-ping.com/{}'.format(ping_url_or_uuid)
|
|
)
|
|
dry_run_label = ' (dry run; not actually pinging)' if dry_run else ''
|
|
|
|
healthchecks_state = MONITOR_STATE_TO_HEALTHCHECKS.get(state)
|
|
if healthchecks_state:
|
|
ping_url = '{}/{}'.format(ping_url, healthchecks_state)
|
|
|
|
logger.info(
|
|
'{}: Pinging Healthchecks {}{}'.format(config_filename, state.name.lower(), dry_run_label)
|
|
)
|
|
logger.debug('{}: Using Healthchecks ping URL {}'.format(config_filename, ping_url))
|
|
|
|
if state in (monitor.State.FINISH, monitor.State.FAIL):
|
|
payload = format_buffered_logs_for_payload()
|
|
|
|
if not dry_run:
|
|
logging.getLogger('urllib3').setLevel(logging.ERROR)
|
|
requests.post(ping_url, data=payload)
|