DX Cluster support

providers/dxcluster.py

@@ -0,0 +1,65 @@
+from datetime import datetime, timezone
+from threading import Thread
+
+import pytz
+
+from core.constants import SERVER_OWNER_CALLSIGN
+from data.spot import Spot
+from providers.provider import Provider
+import telnetlib3
+import re
+
+callsign_pattern = "([a-z|0-9|/]+)"
+frequency_pattern = "([0-9|.]+)"
+pattern = re.compile("^DX de "+callsign_pattern+":\\s+"+frequency_pattern+"\\s+"+callsign_pattern+"\\s+(.*)\\s+(\\d{4}Z)", re.IGNORECASE)
+
+class DXCluster(Provider):
+
+    # Constructor requires hostname and port
+    def __init__(self, hostname, port):
+        super().__init__()
+        self.hostname = hostname
+        self.port = port
+        self.telnet = None
+        self.thread = None
+        self.run = True
+
+    def name(self):
+        return "DX Cluster " + self.hostname + " " + str(self.port)
+
+    def start(self):
+        self.thread = Thread(target=self.handle)
+        self.thread.start()
+
+    def stop(self):
+        self.run = False
+        self.telnet.close()
+        self.thread.join()
+
+    def handle(self):
+        self.status = "Connecting"
+        self.telnet = telnetlib3.Telnet(self.hostname, self.port)
+        self.telnet.read_until("login: ".encode("ascii"))
+        self.telnet.write((SERVER_OWNER_CALLSIGN + "\n").encode("ascii"))
+        self.status = "Waiting for Data"
+
+        while self.run:
+            # Check new telnet info against regular expression
+            telnet_output = self.telnet.read_until("\n".encode("ascii"))
+            match = pattern.match(telnet_output.decode("ascii"))
+            if match:
+                spot_time = datetime.strptime(match.group(5), "%H%MZ")
+                spot_datetime = datetime.combine(datetime.today(), spot_time.time()).replace(tzinfo=pytz.UTC)
+                spot = Spot(source=self.name(),
+                            dx_call=match.group(3),
+                            de_call=match.group(1),
+                            freq=float(match.group(2)),
+                            comment=match.group(4).strip(),
+                            time=spot_datetime)
+                # Fill in any blanks
+                spot.infer_missing()
+                # Add to our list
+                self.submit([spot])
+
+                self.status = "OK"
+                self.last_update_time = datetime.now(timezone.utc)