improve shutdown handling

openwebrx.py

@@ -2,7 +2,7 @@ from http.server import HTTPServer
 from owrx.http import RequestHandler
 from owrx.config import PropertyManager
 from owrx.feature import  FeatureDetector
-from owrx.source import SdrService
+from owrx.source import SdrService, ClientRegistry
 from socketserver import ThreadingMixIn
 from owrx.sdrhu import SdrHuUpdater
 
@@ -45,4 +45,8 @@ Author contact info:    Andras Retzler, HA7ILM <randras@sdr.hu>
 
 
 if __name__ == "__main__":
+    try:
         main()
+    except KeyboardInterrupt:
+        for c in ClientRegistry.getSharedInstance().clients:
+            c.close()

owrx/connection.py

@@ -1,5 +1,5 @@
 from owrx.config import PropertyManager
-from owrx.source import DspManager, CpuUsageThread, SdrService, ClientReporterThread
+from owrx.source import DspManager, CpuUsageThread, SdrService, ClientRegistry
 import json
 
 import logging
@@ -14,7 +14,7 @@ class OpenWebRxClient(object):
     def __init__(self, conn):
         self.conn = conn
 
-        ClientReporterThread.getSharedInstance().addClient(self)
+        ClientRegistry.getSharedInstance().addClient(self)
 
         self.dsp = None
         self.sdr = None
@@ -68,10 +68,8 @@ class OpenWebRxClient(object):
     def close(self):
         self.stopDsp()
         CpuUsageThread.getSharedInstance().remove_client(self)
-        try:
-            ClientReporterThread.getSharedInstance().removeClient(self)
-        except ValueError:
-            pass
+        ClientRegistry.getSharedInstance().removeClient(self)
+        self.conn.close()
         logger.debug("connection closed")
 
     def stopDsp(self):

owrx/controllers.py

@@ -3,7 +3,7 @@ import mimetypes
 from datetime import datetime
 from owrx.websocket import WebSocketConnection
 from owrx.config import PropertyManager
-from owrx.source import ClientReporterThread
+from owrx.source import ClientRegistry
 from owrx.connection import WebSocketMessageHandler
 from owrx.version import openwebrx_version
 
@@ -41,7 +41,7 @@ class StatusController(Controller):
             "status": "active",
             "name": pm["receiver_name"],
             "op_email": pm["receiver_admin"],
-            "users": ClientReporterThread.getSharedInstance().clientCount(),
+            "users": ClientRegistry.getSharedInstance().clientCount(),
             "users_max": pm["max_clients"],
             "gps": pm["receiver_gps"],
             "asl": pm["receiver_asl"],

owrx/sdrhu.py

@@ -10,7 +10,7 @@ logger = logging.getLogger(__name__)
 class SdrHuUpdater(threading.Thread):
     def __init__(self):
         self.doRun = True
-        super().__init__()
+        super().__init__(daemon = True)
 
     def update(self):
         pm = PropertyManager.getSharedInstance()

owrx/source.py

@@ -467,6 +467,8 @@ class CpuUsageThread(threading.Thread):
                 c.write_cpu_usage(cpu_usage)
             time.sleep(3)
         logger.debug("cpu usage thread shut down")
+        if CpuUsageThread.sharedInstance == self:
+            CpuUsageThread.sharedInstance = None
 
     def get_cpu_usage(self):
         try:
@@ -499,42 +501,49 @@ class CpuUsageThread(threading.Thread):
             self.shutdown()
 
     def shutdown(self):
-        if self.doRun:
-            if CpuUsageThread.sharedInstance == self:
-                CpuUsageThread.sharedInstance = None
+        self.doRun = False
+
+class ClientReportingThread(threading.Thread):
+    def __init__(self, registry):
+        self.doRun = True
+        self.registry = registry
+        super().__init__()
+    def run(self):
+        while self.doRun:
+            self.registry.broadcast()
+            time.sleep(3)
+    def stop(self):
         self.doRun = False
 
 class TooManyClientsException(Exception):
     pass
 
-class ClientReporterThread(threading.Thread):
+class ClientRegistry(object):
     sharedInstance = None
     @staticmethod
     def getSharedInstance():
-        if ClientReporterThread.sharedInstance is None:
-            ClientReporterThread.sharedInstance = ClientReporterThread()
-            ClientReporterThread.sharedInstance.start()
-        ClientReporterThread.sharedInstance.doRun = True
-        return ClientReporterThread.sharedInstance
+        if ClientRegistry.sharedInstance is None:
+            ClientRegistry.sharedInstance = ClientRegistry()
+        return ClientRegistry.sharedInstance
 
     def __init__(self):
-        self.doRun = True
         self.clients = []
+        self.reporter = None
         super().__init__()
 
-    def run(self):
-        while (self.doRun):
+    def broadcast(self):
         n = self.clientCount()
         for c in self.clients:
             c.write_clients(n)
-            time.sleep(3)
-        ClientReporterThread.sharedInstance = None
 
     def addClient(self, client):
         pm = PropertyManager.getSharedInstance()
         if len(self.clients) >= pm["max_clients"]:
             raise TooManyClientsException()
         self.clients.append(client)
+        if self.reporter is None:
+            self.reporter = ClientReportingThread(self)
+            self.reporter.start()
 
     def clientCount(self):
         return len(self.clients)
@@ -544,5 +553,6 @@ class ClientReporterThread(threading.Thread):
             self.clients.remove(client)
         except ValueError:
             pass
-        if not self.clients:
-            self.doRun = False
+        if not self.clients and self.reporter is not None:
+            self.reporter.stop()
+            self.reporter = None

owrx/websocket.py

@@ -72,5 +72,20 @@ class WebSocketConnection(object):
             else:
                 logger.warning("unsupported opcode: {0}".format(opcode))
 
+    def close(self):
+        try:
+            header = self.get_header(0, 8)
+            self.handler.wfile.write(header)
+            self.handler.wfile.flush()
+        except ValueError:
+            logger.exception("while writing close frame:")
+
+        try:
+            self.handler.finish()
+            self.handler.connection.close()
+        except Exception:
+            logger.exception("while closing connection:")
+
+
 class WebSocketException(Exception):
     pass