first commit

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[codz]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#   Usually these files are written by a python script from a template
+#   before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py.cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+# Pipfile.lock
+
+# UV
+#   Similar to Pipfile.lock, it is generally recommended to include uv.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+# uv.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+# poetry.lock
+# poetry.toml
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#   pdm recommends including project-wide configuration in pdm.toml, but excluding .pdm-python.
+#   https://pdm-project.org/en/latest/usage/project/#working-with-version-control
+# pdm.lock
+# pdm.toml
+.pdm-python
+.pdm-build/
+
+# pixi
+#   Similar to Pipfile.lock, it is generally recommended to include pixi.lock in version control.
+# pixi.lock
+#   Pixi creates a virtual environment in the .pixi directory, just like venv module creates one
+#   in the .venv directory. It is recommended not to include this directory in version control.
+.pixi
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# Redis
+*.rdb
+*.aof
+*.pid
+
+# RabbitMQ
+mnesia/
+rabbitmq/
+rabbitmq-data/
+
+# ActiveMQ
+activemq-data/
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.envrc
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#   JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#   be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#   and can be added to the global gitignore or merged into this file.  For a more nuclear
+#   option (not recommended) you can uncomment the following to ignore the entire idea folder.
+# .idea/
+
+# Abstra
+#   Abstra is an AI-powered process automation framework.
+#   Ignore directories containing user credentials, local state, and settings.
+#   Learn more at https://abstra.io/docs
+.abstra/
+
+# Visual Studio Code
+#   Visual Studio Code specific template is maintained in a separate VisualStudioCode.gitignore 
+#   that can be found at https://github.com/github/gitignore/blob/main/Global/VisualStudioCode.gitignore
+#   and can be added to the global gitignore or merged into this file. However, if you prefer, 
+#   you could uncomment the following to ignore the entire vscode folder
+# .vscode/
+
+# Ruff stuff:
+.ruff_cache/
+
+# PyPI configuration file
+.pypirc
+
+# Marimo
+marimo/_static/
+marimo/_lsp/
+__marimo__/
+
+# Streamlit
+.streamlit/secrets.toml

Dockerfile

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+FROM alpine:3 AS build
+
+RUN apk update && \
+    apk add --no-cache --virtual .build-deps \
+    ca-certificates gcc postgresql-dev linux-headers musl-dev \
+    libffi-dev jpeg-dev zlib-dev \
+    git bash build-base python3-dev
+
+RUN python3 -m venv /venv
+ENV PATH "/venv/bin:$PATH"
+COPY ./watcher_visio/requirements.txt /
+RUN pip install -r /requirements.txt
+
+
+FROM alpine:3
+
+ENV LANG C.UTF-8
+ENV LC_ALL C.UTF-8
+
+ENV PYTHONUNBUFFERED 1
+ENV PATH "/venv/bin:$PATH"
+
+RUN apk add --no-cache --update python3
+
+COPY --from=build /venv /venv
+
+RUN mkdir /app
+COPY ./watcher_visio/ /app
+WORKDIR /app
+
+CMD [ "python", "manage.py", "runserver", "0.0.0.0:5000" ]

docker-compose.yml

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+services:
+  watcher-visio:
+    build: .
+    ports:
+      - "5000:5000"
+    volumes:
+      - ./watcher_visio:/app

watcher_visio/manage.py

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+#!/usr/bin/env python
+"""Django's command-line utility for administrative tasks."""
+import os
+import sys
+
+
+def main():
+    """Run administrative tasks."""
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'watcher_visio.settings')
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and "
+            "available on your PYTHONPATH environment variable? Did you "
+            "forget to activate a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)
+
+
+if __name__ == '__main__':
+    main()

watcher_visio/metrics/templates/dashboard.html

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+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title>Prometheus dashboard</title>
+    <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
+  </head>
+  <body>
+    <h1>Prometheus dashboard</h1>
+    <div>
+      <label>Metric: <input id="metric" value="{{ default_metric }}"/></label>
+      <button id="reload">Reload</button>
+      <a id="pdfLink" href="/report/pdf/?metric={{ default_metric }}" target="_blank">Download PDF</a>
+    </div>
+
+    <canvas id="chart" width="900" height="400"></canvas>
+
+    <script>
+      const ctx = document.getElementById('chart').getContext('2d');
+      let chart = null;
+      async function loadData() {
+        const metric = document.getElementById('metric').value;
+        const res = await fetch(`/api/metrics/?metric=${encodeURIComponent(metric)}`);
+        const payload = await res.json();
+        const labels = (payload.labels || []).map(ts => new Date(ts));
+        const datasets = (payload.datasets || []).map((d, i) => ({
+          label: d.label,
+          data: d.data.map((v, idx) => ({x: labels[idx], y: v})),
+          fill: false,
+          // Chart.js will auto pick colors
+        }));
+        if (chart) chart.destroy();
+        chart = new Chart(ctx, {
+          type: 'line',
+          data: { datasets },
+          options: {
+            parsing: false,
+            scales: {
+              x: { type: 'time', time: { unit: 'minute' } },
+              y: { beginAtZero: true }
+            }
+          }
+        });
+        // update PDF link
+        document.getElementById('pdfLink').href = `/report/pdf/?metric=${encodeURIComponent(metric)}`;
+      }
+
+      document.getElementById('reload').addEventListener('click', loadData);
+      loadData();
+    </script>
+  </body>
+</html>

watcher_visio/metrics/urls.py

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+from django.urls import path
+from . import views
+
+urlpatterns = [
+    path("", views.dashboard, name="dashboard"),
+    path("api/metrics/", views.metrics_api, name="metrics_api"),
+    path("report/pdf/", views.report_pdf, name="report_pdf"),
+]

watcher_visio/metrics/views.py

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+import os
+import json
+import time
+import requests
+from django.conf import settings
+from django.shortcuts import render
+from django.http import JsonResponse, HttpResponse
+from django.template.loader import render_to_string
+
+# Helper: query Prometheus HTTP API (query_range)
+def query_prometheus_range(query, start, end, step="60s"):
+    url = settings.PROMETHEUS_URL.rstrip("/") + "/api/v1/query_range"
+    params = {"query": query, "start": start, "end": end, "step": step}
+    r = requests.get(url, params=params, timeout=10)
+    r.raise_for_status()
+    return r.json()
+
+# API endpoint used by Chart.js frontend
+def metrics_api(request):
+    # get parameters or default (last 1 hour)
+    metric = request.GET.get("metric", settings.PROMETHEUS_DEFAULT_METRIC)
+    now = int(time.time())
+    start = request.GET.get("start", str(now - 3600))  # unix epoch seconds
+    end = request.GET.get("end", str(now))
+    step = request.GET.get("step", "60s")
+
+    # Example: if the metric is a gauge giving bytes, we may want to convert ... keep raw for now
+    q = metric
+    data = query_prometheus_range(q, start, end, step)
+    # Prometheus returns JSON; keep it minimal for Chart.js: {labels: [...], datasets: [{label,...,data:[...]}]}
+    series = []
+    labels = []
+    datasets = []
+
+    if data.get("status") != "success":
+        return JsonResponse({"error": "prometheus error", "detail": data})
+
+    result = data["data"]["result"]  # list of time series
+    # if no series, return empty
+    if not result:
+        return JsonResponse({"labels": [], "datasets": []})
+
+    # Build labels from first series timestamps
+    # Prometheus returns values as [[ts, value], ...]
+    first_values = result[0]["values"]
+    labels = [int(float(t[0])) * 1000 for t in first_values]  # JS prefers ms
+    for s in result:
+        # create dataset for each timeseries (label from metric labels)
+        metric_labels = s.get("metric", {})
+        label = metric_labels.get("instance") or metric_labels.get("domain") or json.dumps(metric_labels)
+        values = [float(v[1]) if v[1] != "NaN" else None for v in s["values"]]
+        datasets.append({
+            "label": label,
+            "data": values,
+        })
+
+    return JsonResponse({"labels": labels, "datasets": datasets})
+
+# Dashboard page (Jinja template)
+def dashboard(request):
+    # let template ask API for data with JS.
+    return render(request, "dashboard.html", {
+        "default_metric": settings.PROMETHEUS_DEFAULT_METRIC,
+    })
+
+# Render page to PDF using WeasyPrint
+def report_pdf(request):
+    # optionally accept ?metric=...&start=...&end=...
+    metric = request.GET.get("metric", settings.PROMETHEUS_DEFAULT_METRIC)
+    now = int(time.time())
+    start = int(request.GET.get("start", now - 3600))
+    end = int(request.GET.get("end", now))
+
+    # fetch data server-side to include in report
+    try:
+        resp = query_prometheus_range(metric, start, end, step="60s")
+    except Exception as e:
+        return HttpResponse(f"Error fetching metrics: {e}", status=500)
+
+    context = {
+        "metric": metric,
+        "prom_data": resp.get("data", {}),
+        "generated_at": time.strftime("%Y-%m-%d %H:%M:%S", time.gmtime()),
+    }
+    html = render_to_string("report.html", context)
+
+    # Generate PDF via WeasyPrint
+    from weasyprint import HTML
+    pdf = HTML(string=html, base_url=request.build_absolute_uri("/")).write_pdf()
+    return HttpResponse(pdf, content_type="application/pdf")

watcher_visio/requirements.txt

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+asgiref==3.11.0
+brotli==1.2.0
+certifi==2025.11.12
+cffi==2.0.0
+charset-normalizer==3.4.4
+cryptography==46.0.3
+cssselect2==0.8.0
+decorator==5.2.1
+Django==5.2.8
+dogpile.cache==1.5.0
+fonttools==4.60.1
+idna==3.11
+iso8601==2.1.0
+Jinja2==3.1.6
+jmespath==1.0.1
+jsonpatch==1.33
+jsonpointer==3.0.0
+keystoneauth1==5.12.0
+MarkupSafe==3.0.3
+openstacksdk==4.8.0
+os-service-types==1.8.2
+pbr==7.0.3
+pillow==12.0.0
+platformdirs==4.5.0
+psutil==7.1.3
+pycparser==2.23
+pydyf==0.11.0
+pyphen==0.17.2
+PyYAML==6.0.3
+requests==2.32.5
+requestsexceptions==1.4.0
+sqlparse==0.5.3
+stevedore==5.6.0
+tinycss2==1.5.1
+tinyhtml5==2.0.0
+typing_extensions==4.15.0
+tzdata==2025.2
+urllib3==2.5.0
+weasyprint==66.0
+webencodings==0.5.1
+zopfli==0.4.0

watcher_visio/watcher_visio/asgi.py

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+"""
+ASGI config for watcher_visio project.
+
+It exposes the ASGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/5.2/howto/deployment/asgi/
+"""
+
+import os
+
+from django.core.asgi import get_asgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'watcher_visio.settings')
+
+application = get_asgi_application()

watcher_visio/watcher_visio/settings.py

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+"""
+Django settings for watcher_visio project.
+
+Generated by 'django-admin startproject' using Django 5.2.8.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/5.2/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/5.2/ref/settings/
+"""
+
+from pathlib import Path
+
+# Build paths inside the project like this: BASE_DIR / 'subdir'.
+BASE_DIR = Path(__file__).resolve().parent.parent
+
+
+# Quick-start development settings - unsuitable for production
+# See https://docs.djangoproject.com/en/5.2/howto/deployment/checklist/
+
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = 'django-insecure-747*14ir*49hoo6c2225)kxr%4^am0ub_s-m^_7i4cctu)v$g8'
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = True
+
+ALLOWED_HOSTS = []
+
+
+# Application definition
+
+INSTALLED_APPS = [
+    'django.contrib.admin',
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'django.contrib.messages',
+    'django.contrib.staticfiles',
+    'metrics',
+]
+
+# Prometheus settings (environment override recommended)
+PROMETHEUS_URL = "http://localhost:9090"   # replace with your Prometheus HTTP endpoint
+PROMETHEUS_DEFAULT_METRIC = "libvirt_domain_info_memory_usage_bytes"
+
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+]
+
+ROOT_URLCONF = 'watcher_visio.urls'
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [],
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = 'watcher_visio.wsgi.application'
+
+
+# Database
+# https://docs.djangoproject.com/en/5.2/ref/settings/#databases
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': BASE_DIR / 'db.sqlite3',
+    }
+}
+
+
+# Password validation
+# https://docs.djangoproject.com/en/5.2/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+]
+
+
+# Internationalization
+# https://docs.djangoproject.com/en/5.2/topics/i18n/
+
+LANGUAGE_CODE = 'en-us'
+
+TIME_ZONE = 'UTC'
+
+USE_I18N = True
+
+USE_TZ = True
+
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/5.2/howto/static-files/
+
+STATIC_URL = 'static/'
+
+# Default primary key field type
+# https://docs.djangoproject.com/en/5.2/ref/settings/#default-auto-field
+
+DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

watcher_visio/watcher_visio/urls.py

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+"""
+URL configuration for watcher_visio project.
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/5.2/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  path('', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.urls import include, path
+    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
+"""
+from django.contrib import admin
+from django.urls import path, include
+
+urlpatterns = [
+    path('admin/', admin.site.urls),
+    path("", include("metrics.urls")),
+]

watcher_visio/watcher_visio/wsgi.py

@@ -0,0 +1,16 @@
+"""
+WSGI config for watcher_visio project.
+
+It exposes the WSGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/5.2/howto/deployment/wsgi/
+"""
+
+import os
+
+from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'watcher_visio.settings')
+
+application = get_wsgi_application()