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# PerfSimPhp - Nginx site configuration for Azure App Service PHP blessed image
#
# This file is a SERVER BLOCK only (not a complete nginx.conf).
# Per Microsoft docs, it is copied to /etc/nginx/sites-available/default
# by the startup command, overriding the stock site config.
#
# DUAL FPM POOL ARCHITECTURE:
#   - Port 9000 (www pool): Load test and other endpoints
#   - Port 9001 (metrics pool): Reserved for /api/metrics/* and /api/health/*
#   This prevents load test traffic from starving the dashboard.
#
# Startup command (set in Azure Portal → General Settings):
#   /home/site/wwwroot/startup.sh
#
# Reference: https://docs.microsoft.com/azure/app-service/configure-language-php?pivots=platform-linux#change-site-root

# Upstream definitions for the two FPM pools
upstream fpm_main {
    server 127.0.0.1:9000;
}

upstream fpm_metrics {
    server 127.0.0.1:9001;
}

server {
    #proxy_cache cache;
    #proxy_cache_valid 200 1s;
    listen 80;
    listen [::]:80;
    listen 8080;
    listen [::]:8080;
    root /home/site/wwwroot/public;
    index index.php index.html index.htm hostingstart.html;
    server_name _;

    port_in_redirect off;

    # Security headers
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    # Disable HSTS to prevent caching of HTTPS redirects during debugging
    add_header Strict-Transport-Security "max-age=0" always;

    # Front controller: serve static files, fall through to index.php
    location / {
        index index.php index.html index.htm hostingstart.html;
        try_files $uri $uri/ /index.php?$args;
    }

    # ==========================================================================
    # METRICS POOL ROUTES — Dedicated workers that can't be starved by load test
    # ==========================================================================
    
    # /api/metrics/probe → MAIN pool (measures main pool latency, not metrics pool)
    location = /api/metrics/probe {
        try_files $uri /index.php?$args;
        fastcgi_split_path_info ^(.+?\.php)(|/.*)$;
        fastcgi_pass fpm_main;
        include fastcgi_params;
        fastcgi_param HTTP_PROXY "";
        fastcgi_param SCRIPT_FILENAME $document_root/index.php;
        fastcgi_param PATH_INFO $fastcgi_path_info;
        fastcgi_param QUERY_STRING $query_string;
        fastcgi_param REQUEST_URI $request_uri;
        fastcgi_intercept_errors on;
        fastcgi_connect_timeout 5;
        fastcgi_send_timeout 30;
        fastcgi_read_timeout 30;
    }

    # /api/metrics (not /probe) and /api/metrics/internal-probes → metrics pool
    location ~ ^/api/metrics(/|$) {
        try_files $uri /index.php?$args;
        fastcgi_split_path_info ^(.+?\.php)(|/.*)$;
        fastcgi_pass fpm_metrics;
        include fastcgi_params;
        fastcgi_param HTTP_PROXY "";
        fastcgi_param SCRIPT_FILENAME $document_root/index.php;
        fastcgi_param PATH_INFO $fastcgi_path_info;
        fastcgi_param QUERY_STRING $query_string;
        fastcgi_param REQUEST_URI $request_uri;
        fastcgi_intercept_errors on;
        fastcgi_connect_timeout 5;
        fastcgi_send_timeout 30;
        fastcgi_read_timeout 30;
    }

    # /api/health/probe → MAIN pool (measures main pool latency for dashboard)
    location = /api/health/probe {
        try_files $uri /index.php?$args;
        fastcgi_split_path_info ^(.+?\.php)(|/.*)$;
        fastcgi_pass fpm_main;
        include fastcgi_params;
        fastcgi_param HTTP_PROXY "";
        fastcgi_param SCRIPT_FILENAME $document_root/index.php;
        fastcgi_param PATH_INFO $fastcgi_path_info;
        fastcgi_param QUERY_STRING $query_string;
        fastcgi_param REQUEST_URI $request_uri;
        fastcgi_intercept_errors on;
        fastcgi_connect_timeout 5;
        fastcgi_send_timeout 30;
        fastcgi_read_timeout 30;
    }

    # /api/health/* → metrics pool (port 9001)
    location ~ ^/api/health(/|$) {
        try_files $uri /index.php?$args;
        fastcgi_split_path_info ^(.+?\.php)(|/.*)$;
        fastcgi_pass fpm_metrics;
        include fastcgi_params;
        fastcgi_param HTTP_PROXY "";
        fastcgi_param SCRIPT_FILENAME $document_root/index.php;
        fastcgi_param PATH_INFO $fastcgi_path_info;
        fastcgi_param QUERY_STRING $query_string;
        fastcgi_param REQUEST_URI $request_uri;
        fastcgi_intercept_errors on;
        fastcgi_connect_timeout 5;
        fastcgi_send_timeout 30;
        fastcgi_read_timeout 30;
    }

    # /api/admin/events → metrics pool (event log for dashboard)
    location = /api/admin/events {
        try_files $uri /index.php?$args;
        fastcgi_split_path_info ^(.+?\.php)(|/.*)$;
        fastcgi_pass fpm_metrics;
        include fastcgi_params;
        fastcgi_param HTTP_PROXY "";
        fastcgi_param SCRIPT_FILENAME $document_root/index.php;
        fastcgi_param PATH_INFO $fastcgi_path_info;
        fastcgi_param QUERY_STRING $query_string;
        fastcgi_param REQUEST_URI $request_uri;
        fastcgi_intercept_errors on;
        fastcgi_connect_timeout 5;
        fastcgi_send_timeout 30;
        fastcgi_read_timeout 30;
    }

    # Redirect server error pages to the static page /50x.html
    location = /50x.html {
        root /html/;
    }

    # Disable .git directory
    location ~ /\.git {
        deny all;
        access_log off;
        log_not_found off;
    }

    # Deny access to hidden files
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }

    # PHP-FPM processing — MAIN POOL (load test, simulations, etc.)
    location ~ [^/]\.php(/|$) {
        fastcgi_split_path_info ^(.+?\.php)(|/.*)$;
        fastcgi_pass fpm_main;
        include fastcgi_params;
        fastcgi_param HTTP_PROXY "";
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param PATH_INFO $fastcgi_path_info;
        fastcgi_param QUERY_STRING $query_string;
        fastcgi_intercept_errors on;
        fastcgi_connect_timeout         300;
        fastcgi_send_timeout           3600;
        fastcgi_read_timeout           3600;
        fastcgi_buffer_size 128k;
        fastcgi_buffers 4 256k;
        fastcgi_busy_buffers_size 256k;
    }

    # Gzip compression
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml image/svg+xml;
    gzip_min_length 1000;
}