syncthing-monitor/syncthing_monitor/etcd_client.py

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import json
import etcd3 as etcd3
from retrying import retry
CLUSTER_INFO_KEY = '/syncthing_monitor/cluster_info'
class EtcdClient:
def __init__(self, host, port):
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self.etcd = etcd3.client(host=host, port=port)
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def load_cluster_info(self):
raw_value = self.etcd.get(CLUSTER_INFO_KEY)[0]
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if raw_value is None:
return {'devices': []}
return json.loads(raw_value)
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@retry
def add_device_to_cluster(self, device_id, hostname, address):
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with self.etcd.lock('syncthing_monitor'):
cluster_info = self.load_cluster_info()
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if any(device_id in device['id'] for device in cluster_info['devices']):
return
new_device = {
'id': device_id,
'hostname': hostname,
'address': address
}
cluster_info['devices'].append(new_device)
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print("Updating etcd value for '{0}': {1}".format(CLUSTER_INFO_KEY, json.dumps(cluster_info)))
self.etcd.put(CLUSTER_INFO_KEY, json.dumps(cluster_info))
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@retry
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def get_device_list(self):
device_list = self.load_cluster_info()['devices']
print("Obtained device_list devices from etcd: {0}".format(json.dumps(device_list)))
return device_list
def register_device_update_handler(self, device_update_handler):
self.etcd.add_watch_callback(CLUSTER_INFO_KEY, device_update_handler)