DX stats table. Closes #99

server/handlers/api/dxstats.py

@@ -0,0 +1,49 @@
+import json
+from collections import Counter
+from datetime import datetime, timedelta
+
+import pytz
+import tornado
+
+from core.prometheus_metrics_handler import api_requests_counter
+
+CONTINENTS = ["EU", "NA", "SA", "AS", "AF", "OC", "AN"]
+BANDS = ["160m", "80m", "60m", "40m", "30m", "20m", "17m", "15m", "12m", "10m", "6m"]
+CONTINENTS_SET = frozenset(CONTINENTS)
+BANDS_SET = frozenset(BANDS)
+
+
+class APIDxStatsHandler(tornado.web.RequestHandler):
+    """API request handler for /api/v1/dxstats"""
+
+    def initialize(self, spots, web_server_metrics):
+        self._spots = spots
+        self._web_server_metrics = web_server_metrics
+
+    def get(self):
+        self._web_server_metrics["last_api_access_time"] = datetime.now(pytz.UTC)
+        self._web_server_metrics["api_access_counter"] += 1
+        self._web_server_metrics["status"] = "OK"
+        api_requests_counter.inc()
+
+        one_hour_ago = (datetime.now(pytz.UTC) - timedelta(hours=1)).timestamp()
+        counts = Counter()
+
+        for key in self._spots.iterkeys():
+            spot = self._spots.get(key)
+            if spot is None:
+                continue
+            if not spot.time or spot.time < one_hour_ago:
+                continue
+            if spot.de_continent in CONTINENTS_SET and spot.dx_continent in CONTINENTS_SET and spot.band in BANDS_SET:
+                counts[spot.de_continent, spot.dx_continent, spot.band] += 1
+
+        result = {
+            de: {dx: {band: counts[de, dx, band] for band in BANDS} for dx in CONTINENTS}
+            for de in CONTINENTS
+        }
+
+        self.write(json.dumps(result))
+        self.set_status(200)
+        self.set_header("Cache-Control", "no-store")
+        self.set_header("Content-Type", "application/json")