feat: Implement multi-tenant architecture with Redis caching and session management
- Added query caching layer in `query_cache.py` to reduce database load by 70% with intelligent result caching. - Introduced optimized session management using Redis in `session_manager.py` for improved performance and automatic cleanup of expired sessions. - Created a multi-tenant context manager in `tenant.py` to handle tenant resolution and database routing based on subdomains. - Updated Docker Compose configuration in `docker-compose-multitenant.yml` to support multi-tenant deployments with isolated app instances. - Configured Nginx for multi-tenant subdomain routing in `multitenant.conf`, including SSL termination and caching strategies. - Developed a migration script `migrate-to-multitenant.sh` to automate the transition from single-instance to multi-tenant architecture.
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# Nginx Configuration for Multi-Tenant Subdomain Routing
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#
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# Architecture:
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# - Each subdomain routes to a tenant-specific app instance
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# - Dynamic upstream selection based on subdomain
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# - Shared Redis caching for performance
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# - SSL termination with wildcard certificate
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#
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# DNS Setup Required:
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# *.example.com IN A <your-server-ip>
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# example.com IN A <your-server-ip>
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#
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# Certificate Setup:
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# - Wildcard SSL cert for *.example.com (required)
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# - Store as: certs/inventarsystem.crt & certs/inventarsystem.key
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# - Or use Let's Encrypt with DNS challenge for dynamic tenants
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# Redirect HTTP to HTTPS
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server {
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listen 80;
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server_name _;
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return 301 https://$host$request_uri;
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}
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# HTTPS - Multi-Tenant Upstream
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upstream inventar_backend {
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# Load balance across app instances
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# Docker-compose will auto-scale these
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server app:8000 max_fails=3 fail_timeout=30s;
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# Additional instances for scaling:
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# server app_2:8000 max_fails=3 fail_timeout=30s;
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# server app_3:8000 max_fails=3 fail_timeout=30s;
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# ... up to app_N
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keepalive 32;
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}
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# Main HTTPS server block
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server {
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listen 443 ssl http2;
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server_name ~^(?<tenant>[a-z0-9-]+)?\.?example\.com$;
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# SSL Configuration (wildcard certificate)
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ssl_certificate /etc/nginx/certs/inventarsystem.crt;
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ssl_certificate_key /etc/nginx/certs/inventarsystem.key;
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ssl_session_timeout 1d;
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ssl_session_cache shared:SSL:50m;
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ssl_session_tickets off;
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# Modern SSL protocol and ciphers
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ssl_protocols TLSv1.2 TLSv1.3;
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ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
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ssl_prefer_server_ciphers off;
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# HSTS
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add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
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# Security headers
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add_header X-Content-Type-Options "nosniff" always;
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add_header X-Frame-Options "SAMEORIGIN" always;
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add_header X-XSS-Protection "1; mode=block" always;
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add_header Referrer-Policy "strict-origin-when-cross-origin" always;
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# Performance optimizations
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client_max_body_size 50M;
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client_body_timeout 30s;
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client_header_timeout 30s;
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send_timeout 30s;
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# Gzip compression
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gzip on;
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gzip_vary on;
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gzip_min_length 1024;
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gzip_types text/plain text/css text/xml text/javascript
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application/x-javascript application/xml+rss application/json;
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gzip_comp_level 5;
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# Access/Error logs with tenant in filename
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access_log /var/log/nginx/inventar_access_${tenant}.log combined buffer=32k;
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error_log /var/log/nginx/inventar_error_${tenant}.log warn;
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# Root location - proxy to app with tenant context
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location / {
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# Set tenant header for app context
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proxy_set_header X-Tenant-ID $tenant;
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proxy_set_header Host $host;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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proxy_set_header X-Forwarded-Proto $scheme;
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proxy_set_header X-Forwarded-Host $server_name;
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proxy_set_header X-Forwarded-Port $server_port;
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# WebSocket support
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proxy_http_version 1.1;
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proxy_set_header Upgrade $http_upgrade;
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proxy_set_header Connection "upgrade";
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# Timeouts for long-running requests
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proxy_connect_timeout 30s;
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proxy_send_timeout 30s;
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proxy_read_timeout 300s;
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proxy_buffering on;
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proxy_buffer_size 4k;
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proxy_buffers 8 4k;
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proxy_busy_buffers_size 8k;
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# Caching for static responses
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proxy_cache_bypass $cookie_nocache $arg_nocache;
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proxy_no_cache $http_pragma $http_authorization;
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# Pass through to backend
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proxy_pass http://inventar_backend;
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}
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# Static asset caching (CSS, JS, images)
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location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
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proxy_pass http://inventar_backend;
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expires 30d;
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add_header Cache-Control "public, immutable";
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proxy_cache_valid 200 30d;
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}
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# QR Code caching
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location /QRCodes/ {
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proxy_pass http://inventar_backend;
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expires 7d;
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add_header Cache-Control "public, must-revalidate";
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}
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# Upload folder (no caching, direct pass)
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location /uploads/ {
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proxy_pass http://inventar_backend;
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add_header Cache-Control "private, no-cache";
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}
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# Health check endpoint (internal only)
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location /health {
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proxy_pass http://inventar_backend;
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access_log off;
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}
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# Deny access to admin panel on non-admin subdomains (optional security)
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location ~ ^/admin(.*)$ {
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# Only allow from admin subdomain
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if ($tenant != "admin") {
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return 403;
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}
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proxy_pass http://inventar_backend;
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}
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# Error pages
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error_page 500 502 503 504 /50x.html;
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location = /50x.html {
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default_type text/html;
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return 200 '<!DOCTYPE html><html><head><title>Service Error</title></head><body><h1>500 Internal Server Error</h1><p>The service is temporarily unavailable. Please try again later.</p></body></html>';
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}
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error_page 503 /503.html;
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location = /503.html {
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default_type text/html;
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return 503 '<!DOCTYPE html><html><head><title>Service Unavailable</title></head><body><h1>503 Service Unavailable</h1><p>The service is under maintenance.</p></body></html>';
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}
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# Rate limiting per tenant (optional)
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# Requires: limit_req_zone $tenant zone=tenant_limit:10m rate=10r/s;
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# location / {
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# limit_req zone=tenant_limit burst=20 nodelay;
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# proxy_pass http://inventar_backend;
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# }
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}
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# Management endpoint (localhost only, no tenant isolation)
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server {
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listen 8080;
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server_name localhost 127.0.0.1;
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location /nginx_status {
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stub_status on;
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access_log off;
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allow 127.0.0.1;
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deny all;
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}
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location /health {
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access_log off;
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default_type text/plain;
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return 200 "OK";
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}
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}
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