From 9877bdf22b362c5b6c18a32ee3d1a4d93d6103f0 Mon Sep 17 00:00:00 2001
From: Martin/Geno <geno+dev@fireorbit.de>
Date: Thu, 17 Oct 2019 07:01:00 +0200
Subject: [PATCH] first prometheus impl

---
 prometheus.py | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100755 prometheus.py

diff --git a/prometheus.py b/prometheus.py
new file mode 100755
index 0000000..8a053f1
--- /dev/null
+++ b/prometheus.py
@@ -0,0 +1,93 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from ejabberdrpc import EjabberdMetrics
+
+import time
+import threading
+import socket
+from http.server import BaseHTTPRequestHandler, HTTPServer
+from socketserver import ThreadingMixIn
+
+class _ThreadingSimpleServer(ThreadingMixIn, HTTPServer):
+    """Thread per request HTTP server."""
+    # Make worker threads "fire and forget". Beginning with Python 3.7 this
+    # prevents a memory leak because ``ThreadingMixIn`` starts to gather all
+    # non-daemon threads in a list in order to join on them at server close.
+    # Enabling daemon threads virtually makes ``_ThreadingSimpleServer`` the
+    # same as Python 3.7's ``ThreadingHTTPServer``.
+    daemon_threads = True
+    address_family = socket.AF_INET6
+
+
+class Prometheus():
+    def __init__(self, metrics):
+        self._metrics = metrics
+    
+    def _parse_metric(self, name, value, tags=None):
+        output = name
+        if isinstance(tags, dict):
+            output += "{"
+            first = True
+            for k, v in tags.items():
+                if not first:
+                    output += ', '
+                else:
+                    first = False
+                output += k+'="'+v+'"'
+            output += '}'
+        return output + ' {}\n'.format(value)
+
+    def _get_metrics(self):
+        output = ""
+
+        output += self._parse_metric("ejabberd_registered_total", self._metrics.get_registered())
+
+        for host in self._metrics.get_vhosts():
+            output += self._parse_metric("ejabberd_registered_vhosts", self._metrics.get_registered(host), {"vhost": host})
+
+            for k, v in self._metrics.get_online_by_node(vhost=host).items():
+                output += self._parse_metric("ejabberd_online_vhost_node", v, {"vhost": host, "node": k})
+
+            for node in self._metrics.get_nodes():
+                for k, v in self._metrics.get_online_by_status(node=node, vhost=host).items():
+                    output += self._parse_metric("ejabberd_online_status", v, {"vhost": host, "node": node, "status": k})
+                for k, v in self._metrics.get_online_by_connection(node=node, vhost=host).items():
+                    output += self._parse_metric("ejabberd_online_connection", v, {"vhost": host, "node": node, "connection": k})
+                for k, v in self._metrics.get_online_by_client(node=node, vhost=host).items():
+                    output += self._parse_metric("ejabberd_online_client", v, {"vhost": host, "node": node, "client": k})
+                for k, v in self._metrics.get_online_by_ipversion(node=node, vhost=host).items():
+                    output += self._parse_metric("ejabberd_online_ipversion", v, {"vhost": host, "node": node, "ipversion": str(k)})
+
+        # next four lines should be dropped  - it should be calc by ejabberd_online_vhost_node
+        for k, v in self._metrics.get_online_by_node().items():
+                output += self._parse_metric("ejabberd_online_node_total", v, {"node": k})
+        for k, v in self._metrics.get_online_by_vhost().items():
+                output += self._parse_metric("ejabberd_online_vhost_total", v, {"vhost": k})
+
+        return output
+
+
+    def listen(self, port, addr='::'):
+        """Starts an HTTP server for prometheus metrics as a daemon thread"""
+        class myHandler(BaseHTTPRequestHandler):
+            def do_GET(r):
+                r.send_response(200)
+                r.send_header('Content-type', 'text/html')
+                r.end_headers()
+                result = self._get_metrics()
+                r.wfile.write(result.encode('utf-8'))
+
+        
+        httpd = _ThreadingSimpleServer((addr, port), myHandler)
+        t = threading.Thread(target=httpd.serve_forever)
+        t.daemon = True
+        t.start()
+
+if __name__ == "__main__":
+    metrics = EjabberdMetrics("http://[::1]:4560")
+    prom = Prometheus(metrics)
+    prom.listen(8080)
+    while True:
+        metrics.update()
+        time.sleep(10)