break apart the ever-growing owrx/source.py

owrx/client.py

@@ -0,0 +1,50 @@
+from owrx.config import PropertyManager
+from owrx.metrics import Metrics, DirectMetric
+import threading
+
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+class TooManyClientsException(Exception):
+    pass
+
+
+class ClientRegistry(object):
+    sharedInstance = None
+    creationLock = threading.Lock()
+
+    @staticmethod
+    def getSharedInstance():
+        with ClientRegistry.creationLock:
+            if ClientRegistry.sharedInstance is None:
+                ClientRegistry.sharedInstance = ClientRegistry()
+        return ClientRegistry.sharedInstance
+
+    def __init__(self):
+        self.clients = []
+        Metrics.getSharedInstance().addMetric("openwebrx.users", DirectMetric(self.clientCount))
+        super().__init__()
+
+    def broadcast(self):
+        n = self.clientCount()
+        for c in self.clients:
+            c.write_clients(n)
+
+    def addClient(self, client):
+        pm = PropertyManager.getSharedInstance()
+        if len(self.clients) >= pm["max_clients"]:
+            raise TooManyClientsException()
+        self.clients.append(client)
+        self.broadcast()
+
+    def clientCount(self):
+        return len(self.clients)
+
+    def removeClient(self, client):
+        try:
+            self.clients.remove(client)
+        except ValueError:
+            pass
+        self.broadcast()