python: add statistics over HTTP/HTTPS script

python/stats_http.py

+#!/usr/bin/env python3
+
+"""Simple program for exposing statistics from Knot DNS over HTTP/HTTPS."""
+
+import http.server
+import libknot.control
+import json
+import ssl
+import time
+
+# Configuration.
+#libknot.control.load_lib("../src/.libs/libknot.so")
+ctl_socket = "/tmp/knot.sock"
+ctl_timeout = 2
+ctl_flags = "" # set "F" for all supported counters.
+http_host = "127.0.0.1"
+http_port = 8080
+ssl_enable = False
+ssl_keyfile = "./mykey.key"
+ssl_certfile = "./mycert.crt"
+
+
+class StatsServer(http.server.BaseHTTPRequestHandler):
+    def do_GET(self):
+        self.send_response(200)
+        self.send_header("Content-type", "text/html")
+        self.end_headers()
+
+        # Connect to Knot server.
+        ctl = libknot.control.KnotCtl()
+        ctl.connect(ctl_socket)
+        ctl.set_timeout(ctl_timeout)
+
+        # Get global metrics.
+        global_stats = dict()
+        try:
+            ctl.send_block(cmd="stats", flags=ctl_flags)
+            global_stats = ctl.receive_stats()
+        except:
+            pass
+
+        # Get zone metrics.
+        zone_stats = dict()
+        try:
+            ctl.send_block(cmd="zone-stats", flags=ctl_flags)
+            zone_stats = ctl.receive_stats()
+        except:
+           pass
+
+        # Disconnect from the server.
+        ctl.send(libknot.control.KnotCtlType.END)
+        ctl.close()
+
+        # Publish the stats.
+        stats = {**global_stats, **zone_stats}
+        self.wfile.write(bytes(json.dumps(stats, indent=4, sort_keys=True), "utf-8"))
+
+
+httpd = http.server.HTTPServer((http_host, http_port), StatsServer)
+
+if ssl_enable:
+    httpd.socket = ssl.wrap_socket(httpd.socket, keyfile=ssl_keyfile,
+                                   certfile=ssl_certfile, server_side=True)
+
+print("%s: HTTP%s Server Start - %s:%s" %
+      (time.asctime(), "S" if ssl_enable else "", http_host, http_port))
+
+try:
+    httpd.serve_forever()
+except KeyboardInterrupt:
+    pass
+
+httpd.server_close()