share filtering logic

tailscalesd/main.py

@@ -137,8 +137,8 @@ def matrix_workers_to_sd(tailnet, device, workers) -> List[Dict]:
     return target_groups
 
 
-async def matrix_sd(tailnet, devices) -> List[Dict]:
+def filter_devices(devices) -> List[Dict]:
-    sd: List[Dict] = []
+    devices_filtered = []
     for device in devices:
         hostname = device.get("hostname", None)
         if not hostname:
@@ -150,6 +150,13 @@ async def matrix_sd(tailnet, devices) -> List[Dict]:
                 extra={"device": device},
             )
             continue
+        devices_filtered.append(device)
+    return devices_filtered
+
+
+async def matrix_sd(tailnet, devices) -> List[Dict]:
+    sd: List[Dict] = []
+    for device in devices:
         if MATRIX_TAG not in device["tags"]:
             continue
         try:
@@ -190,6 +197,7 @@ async def poll_sd(settings: Settings):
     while True:
         try:
             devices = await tailscale_devices(settings)
+            devices = filter_devices(devices)
             device_targets = plain_devices_sd(settings.tailnet, devices)
             matrix_targets = await matrix_sd(settings.tailnet, devices)
             CACHE_SD = matrix_targets + device_targets