Introduce embedded HTTP server for HAProxy monitoring dashboard

- Added a Python-based HTTP server to serve `dashboard.html` at `/` or `/dashboard.html` paths.
- Updated HAProxy configuration to integrate backend for the dashboard.
- Enhanced handling of index paths with conditional redirects to the dashboard page.
- Modified tests and updated expected outputs to reflect these changes.

Author: byjg

deploy/docker/assets/etc/easyhaproxy/www/dashboard.html

@@ -21,7 +21,7 @@ Automatically generates HAProxy `fcgi-app` configuration that defines required C
 | Option            | Description                             | Default                            |
 |-------------------|-----------------------------------------|------------------------------------|
 | `enabled`         | Enable/disable plugin                   | `true`                             |
-| `document_root`   | Document root path                      | `/etc/easyhaproxy/www`             |
+| `document_root`   | Document root path                      | `/var/www/html`             |
 | `script_filename` | Custom pattern for SCRIPT_FILENAME      | `%[path]` (uses HAProxy's default) |
 | `index_file`      | Default index file                      | `index.php`                        |
 | `path_info`       | Enable PATH_INFO support                | `true`                             |
@@ -41,10 +41,10 @@ services:
       easyhaproxy.http.localport: 9000
       easyhaproxy.http.proto: fcgi
       easyhaproxy.http.plugins: fastcgi
-      easyhaproxy.http.plugin.fastcgi.document_root: /etc/easyhaproxy/www
+      easyhaproxy.http.plugin.fastcgi.document_root: /var/www/html
       easyhaproxy.http.plugin.fastcgi.index_file: index.php
     volumes:
-      - ./app:/etc/easyhaproxy/www
+      - ./app:/var/www/html
 ```
 
 ### Docker/Docker Compose (Unix socket)
@@ -58,10 +58,10 @@ services:
       easyhaproxy.http.socket: /run/php/php-fpm.sock
       easyhaproxy.http.proto: fcgi
       easyhaproxy.http.plugins: fastcgi
-      easyhaproxy.http.plugin.fastcgi.document_root: /etc/easyhaproxy/www
+      easyhaproxy.http.plugin.fastcgi.document_root: /var/www/html
       easyhaproxy.http.plugin.fastcgi.index_file: index.php
     volumes:
-      - ./app:/etc/easyhaproxy/www
+      - ./app:/var/www/html
       - /run/php:/run/php
 ```
 
@@ -73,7 +73,7 @@ kind: Ingress
 metadata:
   annotations:
     easyhaproxy.plugins: "fastcgi"
-    easyhaproxy.plugin.fastcgi.document_root: "/etc/easyhaproxy/www"
+    easyhaproxy.plugin.fastcgi.document_root: "/var/www/html"
     easyhaproxy.plugin.fastcgi.index_file: "index.php"
 spec:
   rules:
@@ -101,7 +101,7 @@ easymapping:
       - fastcgi
     plugin_config:
       fastcgi:
-        document_root: /etc/easyhaproxy/www
+        document_root: /var/www/html
         index_file: index.php
         path_info: true
 ```
@@ -111,7 +111,7 @@ easymapping:
 | Environment Variable                         | Config Key        | Type     | Default                | Description                           |
 |----------------------------------------------|-------------------|----------|------------------------|---------------------------------------|
 | `EASYHAPROXY_PLUGIN_FASTCGI_ENABLED`         | `enabled`         | boolean  | `true`                 | Enable/disable plugin for all domains |
-| `EASYHAPROXY_PLUGIN_FASTCGI_DOCUMENT_ROOT`   | `document_root`   | string   | `/etc/easyhaproxy/www` | Document root path                    |
+| `EASYHAPROXY_PLUGIN_FASTCGI_DOCUMENT_ROOT`   | `document_root`   | string   | `/var/www/html` | Document root path                    |
 | `EASYHAPROXY_PLUGIN_FASTCGI_SCRIPT_FILENAME` | `script_filename` | string   | `%[path]`              | Custom pattern for SCRIPT_FILENAME    |
 | `EASYHAPROXY_PLUGIN_FASTCGI_INDEX_FILE`      | `index_file`      | string   | `index.php`            | Default index file                    |
 | `EASYHAPROXY_PLUGIN_FASTCGI_PATH_INFO`       | `path_info`       | boolean  | `true`                 | Enable PATH_INFO support              |
@@ -121,7 +121,7 @@ easymapping:
 ```haproxy
 # Top-level fcgi-app definition (added after defaults, before frontends/backends)
 fcgi-app fcgi_phpapp_local
-    docroot /etc/easyhaproxy/www
+    docroot /var/www/html
     index index.php
     path-info ^(/.+\.php)(/.*)?$
 

docs/reference/plugins/fastcgi.md

@@ -64,8 +64,8 @@ All EasyHAProxy files are organized under `/etc/easyhaproxy/`. This can be custo
 │
 ├── cloudflare_ips.lst                  # Optional - Cloudflare plugin
 │
-└── www/                                # Optional - FastCGI document root
-    └── index.php
+└── www/                                # 📦 Base image - Stats dashboard
+    └── dashboard.html                  # 📦 Base image - Stats dashboard UI
 ```
 
 :::tip Legend
@@ -88,7 +88,7 @@ The most commonly mapped volumes for persistence and customization:
 | `/etc/easyhaproxy/haproxy/errors-custom/` | [Custom error pages](other.md) - custom HTTP error pages (400, 403, 500, etc.)             | Optional |
 | `/etc/easyhaproxy/plugins/`               | [Custom plugins](../guides/plugins.md) - Python plugin files                               | Optional |
 | `/etc/easyhaproxy/jwt_keys/`              | [JWT public keys](plugins/jwt-validator.md) - RSA public keys for JWT validation           | Optional |
-| `/etc/easyhaproxy/www/`                   | [FastCGI document root](plugins/fastcgi.md) - PHP/FastCGI application files                | Optional |
+| `/etc/easyhaproxy/www/`                   | Stats dashboard UI - served on port `stats_port + 10000` (default `11936`)                 | Optional |
 
 ## Directory Details
 

docs/reference/volumes.md

@@ -2,6 +2,8 @@
 import os
 import shutil
 import sys
+import threading
+from http.server import BaseHTTPRequestHandler, HTTPServer
 
 from deepdiff import DeepDiff
 
@@ -16,6 +18,38 @@
 from processor import ProcessorInterface
 
 
+class DashboardHandler(BaseHTTPRequestHandler):
+    _content: bytes | None = None
+
+    def do_GET(self):
+        if self.path in ("/", "/index.html", "/dashboard.html"):
+            if DashboardHandler._content is None:
+                dashboard_path = os.path.join(Consts.www_path, "dashboard.html")
+                try:
+                    with open(dashboard_path, "rb") as f:
+                        DashboardHandler._content = f.read()
+                except OSError:
+                    DashboardHandler._content = b""
+            self.send_response(200)
+            self.send_header("Content-Type", "text/html; charset=utf-8")
+            self.send_header("Content-Length", str(len(DashboardHandler._content)))
+            self.end_headers()
+            self.wfile.write(DashboardHandler._content)
+        else:
+            self.send_response(404)
+            self.end_headers()
+
+    def log_message(self, format, *args):
+        pass
+
+
+def start_dashboard_server():
+    server = HTTPServer(("127.0.0.1", Consts.DASHBOARD_SERVER_PORT), DashboardHandler)
+    t = threading.Thread(target=server.serve_forever, daemon=True)
+    t.start()
+    logger_easyhaproxy.info(f"Dashboard server listening on 127.0.0.1:{Consts.DASHBOARD_SERVER_PORT}")
+
+
 def _build_parser() -> argparse.ArgumentParser:
     parser = argparse.ArgumentParser(
         prog="easy-haproxy",
@@ -146,6 +180,8 @@ def start():
     os.makedirs(Consts.certs_certbot, exist_ok=True)
     os.makedirs(Consts.certs_haproxy, exist_ok=True)
 
+    start_dashboard_server()
+
     processor_obj.save_config(Consts.haproxy_config)
     processor_obj.save_certs(Consts.certs_haproxy)
     certbot_certs_found = processor_obj.get_certbot_hosts()

src/easyhaproxy/main.py

@@ -4,7 +4,7 @@
 
 from jinja2 import Environment, FileSystemLoader
 
-from functions import Functions, logger_easyhaproxy
+from functions import Functions, logger_easyhaproxy, Consts
 
 from .label_handler import DockerLabelHandler
 
@@ -92,7 +92,8 @@ def generate(self, container_metadata={}):
         return template.render(
             data=self.mapping,
             global_plugin_configs=self.global_plugin_configs,
-            defaults_plugin_configs=self.defaults_plugin_configs
+            defaults_plugin_configs=self.defaults_plugin_configs,
+            dashboard_server_port=Consts.DASHBOARD_SERVER_PORT
         )
 
     def parse(self, container_metadata):

src/easymapping/config_generator.py

@@ -56,4 +56,11 @@ def certs_certbot(cls):
     @classproperty
     def certs_haproxy(cls):
         """Path to user-provided certificates directory."""
-        return f"{cls.base_path}/certs/haproxy"
+        return f"{cls.base_path}/certs/haproxy"
+
+    @classproperty
+    def www_path(cls):
+        """Path to the web assets directory (dashboard, static files)."""
+        return f"{cls.base_path}/www"
+
+    DASHBOARD_SERVER_PORT = 9190

src/functions/consts.py

@@ -10,7 +10,7 @@
 
 Configuration:
     - enabled: Enable/disable the plugin (default: true)
-    - document_root: Document root path (default: /etc/easyhaproxy/www)
+    - document_root: Document root path (default: /var/www/html)
     - script_filename: Pattern for SCRIPT_FILENAME (default: %[path])
     - index_file: Default index file (default: index.php)
     - path_info: Enable PATH_INFO support (default: true)
@@ -39,8 +39,6 @@
 import os
 import sys
 
-from functions import Consts
-
 # Add parent directory to path for imports
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
@@ -52,7 +50,7 @@ class FastcgiPlugin(PluginInterface):
 
     def __init__(self):
         self.enabled = True
-        self.document_root = Consts.base_path + "/www"
+        self.document_root = "/var/www/html"
         self.script_filename = "%[path]"
         self.index_file = "index.php"
         self.path_info = True

src/plugins/builtin/fastcgi.py

@@ -97,8 +97,14 @@ frontend dashboard
     mode http
     acl is_index path /
     acl is_index path /index.html
-    http-request return status 200 content-type "text/html" file /etc/easyhaproxy/www/dashboard.html if is_index
-    http-request return status 404
+    acl is_dashboard path /dashboard.html
+    http-request set-path /dashboard.html if is_index
+    http-request return status 404 if !is_dashboard
+    default_backend srv_dashboard
+
+backend srv_dashboard
+    mode http
+    server Local 127.0.0.1:{{ dashboard_server_port }}
 {% endif %}
 {% for o in data["easymapping"] -%}
     {% set mode = o["mode"] or "http" %}

src/templates/haproxy.cfg.j2

@@ -6,13 +6,12 @@
 
 import os
 import shutil
-import tempfile
 import pytest
 
 
-# Create a session-wide temporary directory for all tests
-# Use a different prefix to avoid conflicts with cleanup plugin (which looks for "easyhaproxy_*")
-_test_session_dir = tempfile.mkdtemp(prefix="pytest_easyhaproxy_")
+# Fixed temporary directory for all tests — predictable so expected fixtures can reference it
+_test_session_dir = "/tmp/easyhaproxy_test"
+os.makedirs(_test_session_dir, exist_ok=True)
 os.environ["EASYHAPROXY_BASE_PATH"] = _test_session_dir
 
 

tests/conftest.py

@@ -42,8 +42,14 @@ frontend dashboard
     mode http
     acl is_index path /
     acl is_index path /index.html
-    http-request return status 200 content-type "text/html" file /etc/easyhaproxy/www/dashboard.html if is_index
-    http-request return status 404
+    acl is_dashboard path /dashboard.html
+    http-request set-path /dashboard.html if is_index
+    http-request return status 404 if !is_dashboard
+    default_backend srv_dashboard
+
+backend srv_dashboard
+    mode http
+    server Local 127.0.0.1:9190
 
 frontend http_in_443
     bind *:443  ssl crt /etc/easyhaproxy/certs/certbot/ alpn h2,http/1.1 crt /etc/easyhaproxy/certs/haproxy/ alpn h2,http/1.1