mirror of
https://github.com/outbackdingo/patroni.git
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83 lines
2.9 KiB
Python
83 lines
2.9 KiB
Python
import logging
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import requests
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from requests.exceptions import RequestException
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import sys
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import boto.ec2
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logger = logging.getLogger(__name__)
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class AWSConnection:
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def __init__(self, config):
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self.available = False
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self.config = config
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if 'cluster_name' in config:
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self.cluster_name = config.get('cluster_name')
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elif 'etcd' in config and isinstance(config['etcd'], dict):
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self.cluster_name = config['etcd'].get('scope', 'unknown')
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else:
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self.cluster_name = 'unknown'
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try:
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# get the instance id
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r = requests.get('http://169.254.169.254/latest/dynamic/instance-identity/document', timeout=0.1)
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except RequestException:
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logger.info("cannot query AWS meta-data")
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return
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if r.ok:
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try:
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content = r.json()
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self.instance_id = content['instanceId']
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self.region = content['region']
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except Exception as e:
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logger.info('unable to fetch instance id and region from AWS meta-data: {}'.format(e))
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return
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self.available = True
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def aws_available(self):
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return self.available
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def _tag_ebs(self, role):
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""" set tags, carrying the cluster name, instance role and instance id for the EBS storage """
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if not self.available:
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return False
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tags = {'Name': 'spilo_'+self.cluster_name, 'Role': role, 'Instance': self.instance_id}
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try:
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conn = boto.ec2.connect_to_region(self.region)
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volumes = conn.get_all_volumes(filters={'attachment.instance-id': self.instance_id})
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conn.create_tags([v.id for v in volumes], tags)
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except Exception as e:
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logger.info('could not set tags for EBS storage devices attached: {}'.format(e))
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return False
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return True
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def _tag_ec2(self, role):
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""" tag the current EC2 instance with a cluster role """
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if not self.available:
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return False
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tags = {'Role': role}
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try:
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conn = boto.ec2.connect_to_region(self.region)
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conn.create_tags([self.instance_id], tags)
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except Exception as e:
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logger.info("could not set tags for EC2 instance {}: {}".format(self.instance_id, e))
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return False
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return True
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def on_role_change(self, new_role):
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ret = self._tag_ec2(new_role)
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return self._tag_ebs(new_role) and ret
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if __name__ == '__main__':
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if len(sys.argv) != 3:
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print ("Usage: {0} action role name".format(sys.argv[0]))
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return 1
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action, is_master, name = sys.argv[1:]
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if action in ('on_start', 'on_stop', 'on_role_change'):
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aws = AWSConnection({'cluster_name': name})
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aws.on_role_change('master' if is_master else 'replica')
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return 0
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return 2
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