mirror of
https://github.com/outbackdingo/patroni.git
synced 2026-08-31 16:49:46 +00:00
Alexander KukushkinandGitHub
3fee62c39b
because `boto.exception` is not an excpetion, but a python module. + increase retry timeout to 5 minutes + refactor unit-tests to cover the case with retries.
79 lines
2.8 KiB
Python
Executable File
79 lines
2.8 KiB
Python
Executable File
#!/usr/bin/env python
|
|
|
|
import logging
|
|
import requests
|
|
from requests.exceptions import RequestException
|
|
import sys
|
|
import boto.ec2
|
|
|
|
from patroni.utils import Retry, RetryFailedError
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class AWSConnection(object):
|
|
|
|
def __init__(self, cluster_name):
|
|
self.available = False
|
|
self.cluster_name = cluster_name if cluster_name is not None else 'unknown'
|
|
self._retry = Retry(deadline=300, max_delay=30, max_tries=-1, retry_exceptions=(boto.exception.StandardError,))
|
|
try:
|
|
# get the instance id
|
|
r = requests.get('http://169.254.169.254/latest/dynamic/instance-identity/document', timeout=2.1)
|
|
except RequestException:
|
|
logger.error('cannot query AWS meta-data')
|
|
return
|
|
|
|
if r.ok:
|
|
try:
|
|
content = r.json()
|
|
self.instance_id = content['instanceId']
|
|
self.region = content['region']
|
|
except Exception:
|
|
logger.exception('unable to fetch instance id and region from AWS meta-data')
|
|
return
|
|
self.available = True
|
|
|
|
def retry(self, *args, **kwargs):
|
|
return self._retry.copy()(*args, **kwargs)
|
|
|
|
def aws_available(self):
|
|
return self.available
|
|
|
|
def _tag_ebs(self, conn, role):
|
|
""" set tags, carrying the cluster name, instance role and instance id for the EBS storage """
|
|
tags = {'Name': 'spilo_' + self.cluster_name, 'Role': role, 'Instance': self.instance_id}
|
|
volumes = conn.get_all_volumes(filters={'attachment.instance-id': self.instance_id})
|
|
conn.create_tags([v.id for v in volumes], tags)
|
|
|
|
def _tag_ec2(self, conn, role):
|
|
""" tag the current EC2 instance with a cluster role """
|
|
tags = {'Role': role}
|
|
conn.create_tags([self.instance_id], tags)
|
|
|
|
def on_role_change(self, new_role):
|
|
if not self.available:
|
|
return False
|
|
try:
|
|
conn = self.retry(boto.ec2.connect_to_region, self.region)
|
|
self.retry(self._tag_ec2, conn, new_role)
|
|
self.retry(self._tag_ebs, conn, new_role)
|
|
except RetryFailedError:
|
|
logger.warning("Unable to communicate to AWS "
|
|
"when setting tags for the EC2 instance {0} "
|
|
"and attached EBS volumes".format(self.instance_id))
|
|
return False
|
|
return True
|
|
|
|
|
|
def main():
|
|
logging.basicConfig(format='%(asctime)s %(levelname)s: %(message)s', level=logging.INFO)
|
|
if len(sys.argv) == 4 and sys.argv[1] in ('on_start', 'on_stop', 'on_role_change'):
|
|
AWSConnection(cluster_name=sys.argv[3]).on_role_change(sys.argv[2])
|
|
else:
|
|
sys.exit("Usage: {0} action role name".format(sys.argv[0]))
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|