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magnusandClaude Opus 4.6 32a1509482 Proxy btcdata WebSocket through btcprice for remote access

Browser can't reach the LAN-only btcdata WebSocket when accessing
btcprice remotely (Tailscale/Cloudflare Tunnel). Add a /ws/price
proxy route that relays btcdata frames to the browser so only
btcprice needs to be reachable.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-28 13:43:05 +01:00

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btcprice

Bitcoin price tracker UI — Clojure Kit web application. Serves the HTML/Tailwind UI. Connects to btcdata for live price data via WebSocket.

Build & Development Commands

make run — Start dev server on port 4000
make repl — Start nREPL
make test — Run tests
make tailwind — Watch Tailwind CSS for changes
make uberjar — Build production JAR
docker compose up -d — Start btcprice + btcdata containers

Docker

Docker runs alongside local dev on different ports:

Service	Local dev	Docker
btcprice	localhost:4000	localhost:4041
btcdata	localhost:4100	localhost:4101

btcprice's docker-compose includes btcdata via include: ../btcdata/docker-compose.yml.

REPL Commands

(dev-prep!)   ;; Prepare dev system
(go)          ;; Start system
(reset)       ;; Reload code & restart
(halt)        ;; Stop system

Architecture

Framework: Kit (Integrant-based)
Server: Undertow
Routing: Reitit
Templates: Hiccup + HTMX (WebSocket extension)
Styling: Tailwind CSS v4
Data backend: btcdata (separate service at BTCDATA_URL, default http://localhost:4100)
No database — all data comes from btcdata

Source Layout

src/clj/pmagnus/btcprice/
├── core.clj              # App entry point
├── config.clj            # System config loader
└── web/
    ├── handler.clj       # Ring handler + routes
    ├── htmx.clj          # page/fragment macros
    ├── controllers/
    │   └── health.clj    # Health check
    ├── middleware/
    │   ├── core.clj      # Base middleware
    │   ├── exception.clj # Exception handling
    │   └── formats.clj   # Content negotiation
    └── routes/
        ├── api.clj       # /api routes (JSON)
        ├── ui.clj        # UI routes (HTML + HTMX WebSocket)
        ├── ws_proxy.clj  # WebSocket proxy to btcdata
        └── utils.clj     # Route utilities

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