first commit

2025-11-28 00:20:23 +03:00
commit a8473eec11
13 changed files with 649 additions and 0 deletions
--- a/watcher_visio/manage.py
+++ b/watcher_visio/manage.py
@@ -0,0 +1,22 @@
+#!/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()
--- a/watcher_visio/metrics/templates/dashboard.html
+++ b/watcher_visio/metrics/templates/dashboard.html
@@ -0,0 +1,52 @@
+<!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>
--- a/watcher_visio/metrics/urls.py
+++ b/watcher_visio/metrics/urls.py
@@ -0,0 +1,8 @@
+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"),
+]
--- a/watcher_visio/metrics/views.py
+++ b/watcher_visio/metrics/views.py
@@ -0,0 +1,90 @@
+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")
--- a/watcher_visio/requirements.txt
+++ b/watcher_visio/requirements.txt
@@ -0,0 +1,41 @@
+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
--- a/watcher_visio/watcher_visio/init.py
+++ b/watcher_visio/watcher_visio/init.py
--- a/watcher_visio/watcher_visio/asgi.py
+++ b/watcher_visio/watcher_visio/asgi.py
@@ -0,0 +1,16 @@
+"""
+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()
--- a/watcher_visio/watcher_visio/settings.py
+++ b/watcher_visio/watcher_visio/settings.py
@@ -0,0 +1,127 @@
+"""
+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'
--- a/watcher_visio/watcher_visio/urls.py
+++ b/watcher_visio/watcher_visio/urls.py
@@ -0,0 +1,23 @@
+"""
+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")),
+]
--- a/watcher_visio/watcher_visio/wsgi.py
+++ b/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()