commit f4dd0870c0ffc79783aa3951fe8993de4ddebc16
Author: Jake Howard <git@theorangeone.net>
Date:   Fri Aug 18 17:54:34 2023 +0100

    Add consumers for Traefik and Dokku

diff --git a/create-nginx-map.py b/create-nginx-map.py
new file mode 100644
index 0000000..46bdcaa
--- /dev/null
+++ b/create-nginx-map.py
@@ -0,0 +1,59 @@
+import requests
+from typing import NamedTuple
+import re
+
+TRAEFIK_HOST_RE = re.compile(r"Host\(`([a-z0-9\.-]+)`\)")
+
+class Route(NamedTuple):
+    name: str
+    destination: str
+    hostname: str
+
+
+def get_traefik_routes(traefik_host: str, traefik_route: str):
+    api_response = requests.get(f"{traefik_host}/api/http/routers").json()
+    routes = set()
+
+    for router in api_response:
+        if "Host(" not in router["rule"]:
+            continue
+
+        hosts = TRAEFIK_HOST_RE.findall(router["rule"])
+
+        if not hosts:
+            raise ValueError(f"Failed to find host for {router['rule']}")
+
+        routes.add(Route(
+            router["service"],
+            traefik_route,
+            hosts[0]
+        ))
+
+    return routes
+
+def get_dokku_routes(dokku_exporter_url: str, dokku_route: str):
+    api_response = requests.get(dokku_exporter_url).json()
+
+    routes = set()
+
+    for app in api_response:
+        for vhost in app["vhosts"]:
+            routes.add(Route(
+                app["app"],
+                dokku_route,
+                vhost
+            ))
+
+    return routes
+
+
+def main():
+    routes = []
+    routes.extend(get_traefik_routes("http://10.23.1.103:8080", "http://10.23.1.103"))
+    routes.extend(get_dokku_routes("http://10.23.2.3:8000", "http://10.23.2.3"))
+
+    for route in sorted(routes):
+        print(f"{route.hostname}\t{route.destination};  # {route.name}")
+
+if __name__ == "__main__":
+    main()
diff --git a/dokku-exporter.py b/dokku-exporter.py
new file mode 100644
index 0000000..8a69fca
--- /dev/null
+++ b/dokku-exporter.py
@@ -0,0 +1,58 @@
+from pathlib import Path
+from http.server import BaseHTTPRequestHandler, HTTPServer
+import json
+
+
+class DokkuHostnameExporter(BaseHTTPRequestHandler):
+    DOKKU_HOME = Path("~dokku").expanduser().resolve()
+    VHOST_FILE_NAME = "VHOST"
+
+    def version_string(self) -> str:
+        return "Magic"
+
+    def do_GET(self):
+        lines = []
+
+        for app_dir in self.DOKKU_HOME.iterdir():
+            if not app_dir.is_dir():
+                continue
+
+            host_file = app_dir / self.VHOST_FILE_NAME
+
+            try:
+                if not host_file.is_file():
+                    continue
+            except PermissionError:
+                continue
+
+            vhosts = host_file.read_text().splitlines()
+
+            if not vhosts:
+                continue
+
+            lines.append({
+                "app": app_dir.name,
+                "vhosts": vhosts
+            })
+
+        data = json.dumps(lines)
+
+        self.send_response(200)
+        self.send_header("Content-type", "application/json")
+        self.end_headers()
+        self.wfile.write(data.encode())
+
+def main():
+    web_server = HTTPServer(("0.0.0.0", 8000), DokkuHostnameExporter)
+
+    try:
+        web_server.serve_forever()
+    except KeyboardInterrupt:
+        pass
+
+    web_server.server_close()
+    print("Server stopped.")
+
+
+if __name__ == "__main__":
+    main()