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#!/usr/bin/env python3 | |
import boto3 | |
from datetime import datetime | |
import logging | |
import socket | |
from time import time, sleep | |
logger = logging.getLogger(__name__) | |
log_format = '%(asctime)s %(name)s %(levelname)5s: %(message)s' | |
def main(): | |
from logging import DEBUG, INFO, Formatter | |
logging.getLogger('').setLevel(DEBUG) | |
logging.getLogger('botocore').setLevel(INFO) | |
sh = logging.StreamHandler() | |
sh.setFormatter(Formatter(log_format)) | |
sh.setLevel(DEBUG) | |
logging.getLogger('').addHandler(sh) | |
ah = AWSHandler() | |
ah.setFormatter(Formatter(log_format)) | |
ah.setLevel(DEBUG) | |
logging.getLogger('').addHandler(ah) | |
try: | |
for i in range(1000): | |
logger.debug('debug %s', i) | |
logger.info('info %s', i) | |
if i % 20 == 0: | |
ah.flush() | |
sleep(.3) | |
finally: | |
ah.flush() | |
class AWSHandler (logging.Handler): | |
def __init__(self, session=None, logs_region=None, s3_region=None): | |
super().__init__() | |
session = session or boto3 | |
self.logs_client = session.client('logs', region_name=logs_region or 'eu-central-1') | |
self.s3_client = session.client('s3', region_name=s3_region or 'eu-west-1') | |
self.stream_name = '{date}-{host}'.format( | |
date=datetime.utcnow().strftime('%Y%m%dT%H%M%SZ'), | |
host=socket.getfqdn()) | |
self.logs_client.create_log_stream( | |
logGroupName='demo', | |
logStreamName=self.stream_name) | |
self.seq_token = None | |
self.recursion_guard = False | |
self.archive_content = b'' | |
self.messages_to_flush = [] | |
def emit(self, record): | |
if self.recursion_guard: | |
return | |
self.recursion_guard = True | |
try: | |
msg = self.format(record) | |
self.messages_to_flush.append(msg) | |
r = self.logs_client.put_log_events( | |
logGroupName='demo', | |
logStreamName=self.stream_name, | |
logEvents=[ | |
{ | |
'timestamp': int(time() * 1000), | |
'message': str(msg), | |
}, | |
], | |
# sequenceToken cannot be None, it must be really missing for the first message... | |
**({'sequenceToken': self.seq_token} if self.seq_token else {})) | |
if r.get('rejectedLogEventsInfo'): | |
raise Exception('Rejected: {!r}'.format(r)) | |
self.seq_token = r['nextSequenceToken'] | |
finally: | |
self.recursion_guard = False | |
def flush(self): | |
if not self.messages_to_flush: | |
return | |
self.recursion_guard = True | |
try: | |
data = self.archive_content | |
data += ''.join(msg + '\n' for msg in self.messages_to_flush).encode() | |
self.s3_client.put_object( | |
#ACL='private', | |
ACL='public-read', | |
Body=data, | |
Bucket='example-bucket', | |
ContentType='text/plain', | |
Key='test/{name}.log'.format(name=self.stream_name), | |
StorageClass='STANDARD_IA', | |
) | |
self.archive_content = data | |
self.messages_to_flush = [] | |
finally: | |
self.recursion_guard = False | |
if __name__ == '__main__': | |
main() |
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