73 lines
2.7 KiB
Python
73 lines
2.7 KiB
Python
import json
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import etcd3 as etcd3
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from retrying import retry
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CLUSTER_INFO_KEY = '/syncthing_monitor/cluster_info'
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class EtcdClient:
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def __init__(self, host, port, key=CLUSTER_INFO_KEY):
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self.etcd = etcd3.client(host=host, port=port)
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self.key = key
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@retry(stop_max_delay=60000, wait_fixed=500)
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def load_cluster_info(self):
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print("Retrieving cluster info from etcd...", flush=True)
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raw_value = self.etcd.get(self.key)[0]
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if raw_value is None:
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return {'devices': []}
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return json.loads(raw_value)
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def add_device_to_cluster(self, device_id, node_name, address):
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with self.etcd.lock('syncthing_monitor'):
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cluster_info = self.load_cluster_info()
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print("Checking for existing device with node name '{0}'...".format(node_name), flush=True)
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existing_device = next(
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(device for device in cluster_info['devices'] if node_name in device['node_name']),
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None)
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if existing_device is not None:
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self.update_existing_device(cluster_info, existing_device, device_id, node_name, address)
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return
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print(
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"Existing device not found; Creating new cluster_info entry for node name: '{0}'...".format(node_name),
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flush=True)
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new_device = {
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'id': device_id,
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'node_name': node_name,
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'address': address
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}
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cluster_info['devices'].append(new_device)
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self.do_cluster_info_update(cluster_info)
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def update_existing_device(self, cluster_info, existing_device, device_id, node_name, address):
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if device_id == existing_device['id']:
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print("Existing device contains up-to-date ID! No need to update.".format(node_name), flush=True)
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return
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print("Existing device with my node name '{0}' contains stale info! Updating...".format(node_name), flush=True)
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existing_device['id'] = device_id
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existing_device['address'] = address
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self.do_cluster_info_update(cluster_info)
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@retry(stop_max_delay=60000, wait_fixed=500)
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def do_cluster_info_update(self, cluster_info):
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print("Updating etcd value for '{0}': {1}".format(self.key, json.dumps(cluster_info)), flush=True)
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self.etcd.put(self.key, json.dumps(cluster_info))
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def get_device_list(self):
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device_list = self.load_cluster_info()['devices']
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print("Obtained device_list devices from etcd: {0}".format(json.dumps(device_list)), flush=True)
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return device_list
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def register_device_update_handler(self, device_update_handler):
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self.etcd.add_watch_callback(self.key, device_update_handler)
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