feat: add subpath config (#1236)

Co-authored-by: Warren <5959690+wrn14897@users.noreply.github.com>

.changeset/feat-subpath-config.md

@@ -0,0 +1,9 @@
+---
+'@hyperdx/app': minor
+---
+
+feat: Add subpath configuration support
+
+This change allows the HyperDX frontend to be served from a subpath (e.g.,
+`/hyperdx`). It includes updated Next.js, NGINX, and Traefik configurations,
+along with documentation for the new setup.

.env

@@ -20,6 +20,7 @@ HYPERDX_APP_PORT=8080
 HYPERDX_APP_URL=http://localhost
 HYPERDX_LOG_LEVEL=debug
 HYPERDX_OPAMP_PORT=4320
+HYPERDX_BASE_PATH=
 
 # Otel/Clickhouse config
 HYPERDX_OTEL_EXPORTER_CLICKHOUSE_DATABASE=default

docker-compose.dev.yml

@@ -83,5 +83,29 @@ services:
       interval: 1s
       timeout: 1s
       retries: 60
+
+  # nginx:
+  #   image: nginx:alpine
+  #   ports:
+  #     - '4040:4040'
+  #   volumes:
+  #     - ./proxy/nginx/nginx.conf.template:/etc/nginx/templates/default.conf.template:ro
+  #   environment:
+  #     HYPERDX_BASE_PATH: ${HYPERDX_BASE_PATH:-/}
+  #   network_mode: host
+  #   restart: always
+
+  # traefik:
+  #   image: traefik:latest
+  #   ports:
+  #     - '4040:4040'
+  #   volumes:
+  #     - ./proxy/traefik/traefik.yml:/etc/traefik/traefik.yml:ro
+  #     - ./proxy/traefik/config.yml:/etc/traefik/dynamic/config.yml:ro
+  #   environment:
+  #     HYPERDX_BASE_PATH: ${HYPERDX_BASE_PATH:-/}
+  #   network_mode: host
+  #   restart: always
+
 networks:
   internal:

packages/app/.env.development

@@ -7,3 +7,4 @@ OTEL_EXPORTER_OTLP_ENDPOINT="http://localhost:4318"
 OTEL_SERVICE_NAME="hdx-oss-dev-app"
 PORT=${HYPERDX_APP_PORT}
 NODE_OPTIONS="--max-http-header-size=131072"
+NEXT_PUBLIC_HYPERDX_BASE_PATH=

packages/app/next.config.js

@@ -8,7 +8,10 @@ const withNextra = require('nextra')({
   themeConfig: './src/nextra.config.tsx',
 });
 
+const basePath = process.env.NEXT_PUBLIC_HYPERDX_BASE_PATH;
+
 module.exports = {
+  basePath: basePath,
   experimental: {
     instrumentationHook: true,
     // External packages to prevent bundling issues with Next.js 14

proxy/README.md

@@ -0,0 +1,74 @@
+# Proxy Configuration
+
+This directory contains configurations for running the HyperDX frontend behind a
+reverse proxy that serves the application under a specific subpath. This is
+useful for deployments where HyperDX is not at the root of a domain (e.g.,
+`http://example.com/hyperdx`).
+
+We provide configurations for two popular reverse proxies:
+
+- [Nginx](./nginx/nginx.conf.template)
+- [Traefik](./traefik/config.yml)
+
+## Environment Variables
+
+To configure the subpath, you need to set the following environment variables in
+your `.env` file.
+
+### `HYPERDX_BASE_PATH` and `NEXT_PUBLIC_HYPERDX_BASE_PATH`
+
+To serve the application from a subpath, two environment variables must be set
+to the **same value**:
+
+1.  `HYPERDX_BASE_PATH`: This is used by the reverse proxy (Nginx or Traefik) to
+    handle path routing and rewriting.
+2.  `NEXT_PUBLIC_HYPERDX_BASE_PATH`: This is used by the Next.js application to
+    generate correct asset links and API routes.
+
+- The value **must** start with a `/` if it's not an empty string (ex:
+  `/hyperdx`).
+- If you want to serve from the root, you can omit these variables or set them
+  to `/`.
+
+### `FRONTEND_URL`
+
+This variable should be set to the full public URL of the frontend, including
+the subpath. The API server uses this URL for various purposes such as
+generating absolute URLs for redirects, links in emails, or alerts.
+
+- It should be a full URL, including the protocol (`http` or `https`).
+- It should include the subpath defined in `HYPERDX_BASE_PATH`.
+
+**Example `.env` Configuration:**
+
+For local development with the subpath `/hyperdx`, your configuration would look
+like this:
+
+```
+HYPERDX_BASE_PATH=/hyperdx
+NEXT_PUBLIC_HYPERDX_BASE_PATH=/hyperdx
+FRONTEND_URL=http://localhost:4040/hyperdx
+```
+
+## How It Works
+
+The proxy configurations are designed to handle subpath routing with minimal
+changes to the application code. Here's a high-level overview of the logic:
+
+1.  **Root Redirect**: If a subpath is configured (e.g., `/hyperdx`), any
+    requests to the root (`/`) are automatically redirected to that subpath.
+    This ensures users always land on the correct URL.
+
+2.  **Path Rewriting**: The application's frontend code sometimes makes requests
+    to root-level paths (e.g., `/api/...` or `/_next/...`). The proxy intercepts
+    these requests, prepends the configured subpath, and forwards them to the
+    Next.js server. For example, a request for `/_next/static/chunk.js` becomes
+    a request for `/hyperdx/_next/static/chunk.js` before being sent to the
+    application.
+
+3.  **Direct Proxy**: Any requests that already include the correct subpath are
+    passed directly to the Next.js application, which is configured via
+    `basePath` to handle them correctly.
+
+This setup allows the frontend application to be developed as if it were running
+at the root, while the proxy transparently manages the subpath routing.

proxy/nginx/nginx.conf.template

@@ -0,0 +1,43 @@
+upstream app {
+    server 127.0.0.1:8080;
+}
+
+server {
+    listen 4040;
+
+    set $base_path "${HYPERDX_BASE_PATH}";
+    if ($base_path = "/") {
+        set $base_path "";
+    }
+
+    # Common proxy headers
+    proxy_http_version 1.1;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection 'upgrade';
+    proxy_set_header Host $host;
+    proxy_cache_bypass $http_upgrade;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+
+    # Redirect root to base path, if a base path is set
+    location = / {
+        if ($base_path != "") {
+            return 301 $base_path;
+        }
+        # If no base path, just proxy to the app
+        proxy_pass http://app;
+    }
+
+    # This handles assets and api calls made to the root and rewrites them to include the base path
+    location ~ ^(/api/|/_next/|/__ENV\.js$|/Icon32\.png$) {
+        # Note: $request_uri includes the original full path including query string
+        proxy_pass http://app$base_path$request_uri;
+    }
+
+    # Proxy requests that are already prefixed with the base path to the app
+    location ${HYPERDX_BASE_PATH} {
+        # The full request URI (e.g., /hyperdx/settings) is passed to the upstream
+        proxy_pass http://app;
+    }
+}

proxy/traefik/config.yml

@@ -0,0 +1,46 @@
+http:
+  routers:
+    # This handles the main app at the basepath
+    app-router:
+      entryPoints:
+        - web
+      rule: 'PathPrefix(`{{ env "HYPERDX_BASE_PATH" }}`)'
+      service: app-service
+
+    # This handles assets and api calls at the root and rewrites them
+    assets-api-router:
+      entryPoints:
+        - web
+      rule:
+        'PathPrefix(`/api`) || PathPrefix(`/_next`) || Path(`/__ENV.js`) ||
+        Path(`/Icon32.png`)'
+      service: app-service
+      middlewares:
+        - add-basepath
+
+    # This redirects from / to the basepath
+    root-redirect:
+      entryPoints:
+        - web
+      rule: 'Path(`/`)'
+      service: app-service # service is required, but redirect will happen first
+      middlewares:
+        - redirect-to-basepath
+
+  middlewares:
+    add-basepath:
+      addPrefix:
+        prefix: '{{ env "HYPERDX_BASE_PATH" }}'
+
+    redirect-to-basepath:
+      redirectRegex:
+        regex: '^/$'
+        replacement: '{{ env "HYPERDX_BASE_PATH" }}'
+        permanent: true
+
+  services:
+    app-service:
+      loadBalancer:
+        passHostHeader: true
+        servers:
+          - url: 'http://127.0.0.1:8080'

proxy/traefik/traefik.yml

@@ -0,0 +1,8 @@
+entryPoints:
+  web:
+    address: ':4040'
+
+providers:
+  file:
+    filename: /etc/traefik/dynamic/config.yml
+    watch: true