code formatting

syncthing_monitor/__main__.py

@@ -62,14 +62,14 @@ class SyncthingMonitor:
         self.syncthing.disable_announce_discovery_and_relay()
         self.syncthing.sync_config()
 
-        print("Registering etcd update callback...", flush=True)
-        self.etcd.register_device_update_handler(self.update_devices)
-
         print("Attempting to add this device to etcd...", flush=True)
         self.etcd.add_device_to_cluster(self.my_device_id, self.syncthing_node_name, self.syncthing_publish_address)
         print("Added this device to cluster with publish address: {0}".format(self.syncthing_publish_address),
               flush=True)
 
+        print("Registering etcd update callback...", flush=True)
+        self.etcd.register_device_update_handler(self.update_devices)
+
         self.update_devices(None)
 
         print("Entering loop...", flush=True)
@@ -86,11 +86,14 @@ class SyncthingMonitor:
         print("Updating syncthing based on change to cluster info...", flush=True)
         print("--> Obtaining updated device list...", flush=True)
         device_list = self.etcd.get_device_list()
+
         print("--> Adding new devices to syncthing...", flush=True)
         self.syncthing.add_devices(device_list)
+
         print("--> Updating shared folder with new devices...", flush=True)
         self.syncthing.create_shared_folder(SHARED_FOLDER_ID, SHARED_FOLDER_LABEL, self.syncthing_data_path,
                                             device_list)
+
         self.syncthing.sync_config()
         self.syncthing.print_config()
         print("--> Update completed successfully!", flush=True)

syncthing_monitor/etcd_client.py

@@ -1,6 +1,7 @@
 import json
 
 import etcd3 as etcd3
+from retrying import retry
 
 CLUSTER_INFO_KEY = '/syncthing_monitor/cluster_info'
 
@@ -10,6 +11,7 @@ class EtcdClient:
         self.etcd = etcd3.client(host=host, port=port)
         self.key = key
 
+    @retry(stop_max_delay=60000, wait_fixed=500)
     def load_cluster_info(self):
         print("Retrieving cluster info from etcd...", flush=True)
         raw_value = self.etcd.get(self.key)[0]
@@ -21,9 +23,19 @@ class EtcdClient:
         with self.etcd.lock('syncthing_monitor'):
             cluster_info = self.load_cluster_info()
 
-            if any(device_id in device['id'] for device in cluster_info['devices']):
+            print("Checking for existing device with node name '{0}'...".format(node_name), flush=True)
+            existing_device = next(
+                (device for device in cluster_info['devices'] if node_name in device['node_name']),
+                None)
+
+            if existing_device is not None:
+                self.update_existing_device(cluster_info, existing_device, device_id, node_name, address)
                 return
 
+            print(
+                "Existing device not found; Creating new cluster_info entry for node name: '{0}'...".format(node_name),
+                flush=True)
+
             new_device = {
                 'id': device_id,
                 'node_name': node_name,
@@ -32,8 +44,24 @@ class EtcdClient:
 
             cluster_info['devices'].append(new_device)
 
-            print("Updating etcd value for '{0}': {1}".format(self.key, json.dumps(cluster_info)), flush=True)
-            self.etcd.put(self.key, json.dumps(cluster_info))
+            self.do_cluster_info_update(cluster_info)
+
+    def update_existing_device(self, cluster_info, existing_device, device_id, node_name, address):
+
+        if device_id == existing_device['id']:
+            print("Existing device contains up-to-date ID!  No need to update.".format(node_name), flush=True)
+            return
+
+        print("Existing device with my node name '{0}' contains stale info!  Updating...".format(node_name), flush=True)
+        existing_device['id'] = device_id
+        existing_device['address'] = address
+
+        self.do_cluster_info_update(cluster_info)
+
+    @retry(stop_max_delay=60000, wait_fixed=500)
+    def do_cluster_info_update(self, cluster_info):
+        print("Updating etcd value for '{0}': {1}".format(self.key, json.dumps(cluster_info)), flush=True)
+        self.etcd.put(self.key, json.dumps(cluster_info))
 
     def get_device_list(self):
         device_list = self.load_cluster_info()['devices']

syncthing_monitor/syncthing_client.py

@@ -1,6 +1,7 @@
 import json
 
 import requests
+from retrying import retry
 
 
 class SyncthingClient:
@@ -137,11 +138,14 @@ class SyncthingClient:
     def make_url(self, endpoint):
         return "http://{0}:{1}{2}".format(self.host, self.port, endpoint)
 
+    @retry(stop_max_delay=60000, wait_fixed=500)
     def get(self, endpoint):
         return requests.get(self.make_url(endpoint), headers=self.headers)
 
+    @retry(stop_max_delay=60000, wait_fixed=500)
     def post(self, endpoint, data):
         return requests.post(self.make_url(endpoint), headers=self.headers, data=data)
 
+    @retry(stop_max_delay=60000, wait_fixed=500)
     def patch(self, endpoint, data):
         return requests.patch(self.make_url(endpoint), headers=self.headers, data=data)