Rewrite btcprice from Clojure to Python FastAPI

Replace the Clojure Kit application with a Python FastAPI app that
produces identical HTML output. WebSocket proxy, Danish number
formatting, and HTMX integration all preserved.

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

.gitignore

@@ -1,15 +1,6 @@
-/target
+__pycache__/
-/classes
+*.pyc
-/checkouts
+.venv/
-profiles.clj
-pom.xml
-pom.xml.asc
-*.jar
-*.class
-/.lein-*
-/.nrepl-port
-/.cpcache
-/.clj-kondo
 /node_modules
 /log
 .DS_Store

CLAUDE.md

@@ -1,15 +1,12 @@
 # btcprice
 
-Bitcoin price tracker UI — Clojure Kit web application. Serves the HTML/Tailwind UI. Connects to btcdata for live price data via WebSocket.
+Bitcoin price tracker UI — Python FastAPI 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
+- `make test` — Run tests
-- `docker compose up -d` — Start btcprice + btcdata containers
 
 ## Docker
 
@@ -22,21 +19,11 @@ Docker runs alongside local dev on different ports:
 
 btcprice's docker-compose includes btcdata via `include: ../btcdata/docker-compose.yml`.
 
-## REPL Commands
-
-```clojure
-(dev-prep!)   ;; Prepare dev system
-(go)          ;; Start system
-(reset)       ;; Reload code & restart
-(halt)        ;; Stop system
-```
-
 ## Architecture
 
-- **Framework:** Kit (Integrant-based)
+- **Framework:** FastAPI
-- **Server:** Undertow
+- **Server:** Uvicorn
-- **Routing:** Reitit
+- **Templates:** Inline HTML strings + HTMX (WebSocket extension)
-- **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
@@ -44,21 +31,6 @@ btcprice's docker-compose includes btcdata via `include: ../btcdata/docker-compo
 ## Source Layout
 
 ```
-src/clj/pmagnus/btcprice/
+app/
-├── core.clj              # App entry point
+└── main.py    # FastAPI app: routes, WebSocket proxy, HTML rendering
-├── 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
 ```

Dockerfile

@@ -4,25 +4,22 @@ WORKDIR /build
 COPY package.json package-lock.json ./
 RUN npm ci
 COPY resources/css/ resources/css/
-COPY src/ src/
+COPY app/ app/
 COPY tailwind.config.js ./
 RUN npm run css:build
 
-FROM clojure:temurin-21-tools-deps-alpine AS build
+FROM python:3.13-slim
 
-WORKDIR /build
+WORKDIR /app
-COPY deps.edn build.clj ./
+COPY requirements.txt .
-RUN clj -Sforce -P
+RUN pip install --no-cache-dir -r requirements.txt
-COPY . .
+
+COPY app/ app/
+COPY resources/public/ resources/public/
 COPY --from=css /build/resources/public/css/output.css resources/public/css/output.css
-RUN clj -T:build all
-
-FROM eclipse-temurin:21-jre-alpine
-
-COPY --from=build /build/target/btcprice-standalone.jar /btcprice/btcprice-standalone.jar
 
 EXPOSE 4040
 ENV PORT=4040
 ENV BTCDATA_URL=http://btcdata:4101
 
-CMD ["java", "-jar", "/btcprice/btcprice-standalone.jar"]
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "4040"]

Makefile

@@ -1,25 +1,19 @@
 include .env
 export
 
-.PHONY: clean run run-docker repl tailwind test uberjar
+.PHONY: clean run run-docker tailwind test
 
 clean:
-	rm -rf target
+	rm -rf __pycache__ app/__pycache__
 
 run:
-	clj -M:dev -e "(dev-prep!) (go)" -r
+	.venv/bin/uvicorn app.main:app --host 0.0.0.0 --port 4000 --reload
 
-run-docker:
+run-local:
-	BTCDATA_URL=http://localhost:4101 clj -M:dev -e "(dev-prep!) (go)" -r
+	BTCDATA_URL=$(BTCDATA_LOCAL_URL) .venv/bin/uvicorn app.main:app --host 0.0.0.0 --port 4000 --reload
-
-repl:
-	clj -M:dev:nrepl
 
 tailwind:
 	npm run css:watch
 
 test:
-	clj -M:test
+	.venv/bin/python -m pytest tests/
-
-uberjar:
-	clj -T:build all

app/main.py

@@ -0,0 +1,246 @@
+import json
+import logging
+import os
+from datetime import datetime
+
+import websockets
+from fastapi import FastAPI, WebSocket, WebSocketDisconnect
+from fastapi.responses import FileResponse, HTMLResponse
+from fastapi.staticfiles import StaticFiles
+
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger("btcprice")
+
+BTCDATA_URL = os.environ.get("BTCDATA_URL", "http://localhost:4100")
+
+app = FastAPI()
+
+app.mount("/css", StaticFiles(directory="resources/public/css"), name="css")
+
+
+@app.get("/favicon.ico", include_in_schema=False)
+async def favicon():
+    return FileResponse("resources/public/favicon.svg", media_type="image/svg+xml")
+
+
+# --- HTML page ---
+
+HOME_HTML = """\
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="apple-mobile-web-app-capable" content="yes">
+<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
+<link rel="icon" href="/favicon.ico" type="image/svg+xml">
+<title>BTC Price</title>
+<link rel="stylesheet" href="/css/output.css">
+<script src="https://unpkg.com/htmx.org@2/dist/htmx.min.js"></script>
+<script src="https://unpkg.com/htmx-ext-ws@2/ws.js"></script>
+</head>
+<body>
+<div class="mx-auto max-w-lg px-4 py-6">
+<header class="text-center mb-8">
+<h1 class="text-3xl font-bold text-gray-900">BTC Price</h1>
+</header>
+<div id="price-panel" hx-ext="ws" ws-connect="/ws/price">
+<div id="price-display">
+<div class="bg-white rounded-2xl shadow-sm border border-gray-200 p-6">
+<p class="text-center text-gray-400 text-sm">Connecting...</p>
+</div>
+</div>
+</div>
+<div class="mt-4" hx-ext="ws" ws-connect="/ws/strike">
+<div id="strike-display">
+<div class="bg-white rounded-2xl shadow-sm border border-gray-200 p-6">
+<p class="text-center text-gray-400 text-sm">Loading Strike rates...</p>
+</div>
+</div>
+</div>
+<div class="hidden text-4xl text-2xl font-bold text-green-600 text-red-600 text-gray-900 text-xs text-gray-400 mt-2 flex justify-center justify-between items-center gap-4 mt-1 mt-3 text-sm text-gray-600 text-gray-500 mb-3 py-1 grid grid-cols-2 gap-x-6 gap-y-1" aria-hidden="true"></div>
+</div>
+</body>
+</html>"""
+
+
+@app.get("/", response_class=HTMLResponse)
+async def home():
+    return HOME_HTML
+
+
+# --- Health endpoint ---
+
+
+@app.get("/api/health")
+async def health():
+    return {"status": "up"}
+
+
+# --- Formatting helpers (Danish locale) ---
+
+
+def da_fmt(fmt: str, val: float) -> str:
+    """Format a number using Danish locale conventions."""
+    if fmt == ",.2f":
+        # e.g. 12.345,67
+        int_part = int(val)
+        frac = abs(val - int_part)
+        int_str = f"{int_part:,}".replace(",", ".")
+        return f"{int_str},{frac:.2f}"[:-1].split(",")[0] + "," + f"{frac:.2f}"[2:]
+    if fmt == ",.0f":
+        return f"{int(round(val)):,}".replace(",", ".")
+    if fmt == ".4f":
+        return f"{val:.4f}".replace(".", ",")
+    if fmt == ",d":
+        return f"{int(val):,}".replace(",", ".")
+    return str(val)
+
+
+# --- Price transform ---
+
+
+def price_json_to_html(text: str) -> str:
+    data = json.loads(text)
+    p = float(data["price"])
+    pp = float(data["prev_price"]) if data.get("prev_price") is not None else None
+
+    if pp is None:
+        color = "text-gray-900"
+    elif p > pp:
+        color = "text-green-600"
+    elif p < pp:
+        color = "text-red-600"
+    else:
+        color = "text-gray-900"
+
+    recorded_at = data.get("recorded_at", "")
+    if recorded_at:
+        dt = datetime.fromisoformat(recorded_at.replace("Z", "+00:00"))
+        local_dt = dt.astimezone()
+        ts = local_dt.strftime("%d-%m %H:%M:%S")
+    else:
+        ts = ""
+
+    html = (
+        '<div id="price-display">'
+        '<div class="bg-white rounded-2xl shadow-sm border border-gray-200 p-6">'
+        '<div class="text-center">'
+        f'<p class="text-4xl font-bold {color}">${da_fmt(",.2f", p)}</p>'
+    )
+
+    if data.get("price_eur") is not None:
+        p_eur = float(data["price_eur"])
+        p_dkk = float(data["price_dkk"])
+        eur_rate = p_eur / p
+        dkk_rate = p_dkk / p
+
+        html += (
+            '<div class="flex justify-center gap-4 mt-3">'
+            f'<span class="text-2xl font-bold text-gray-600">\u20ac{da_fmt(",.0f", p_eur)}</span>'
+            f'<span class="text-2xl font-bold text-gray-600">{da_fmt(",.0f", p_dkk)} kr</span>'
+            "</div>"
+            '<div class="flex justify-center gap-4 mt-1">'
+            f'<span class="text-xs text-gray-400">EUR/USD {da_fmt(".4f", eur_rate)}</span>'
+            f'<span class="text-xs text-gray-400">DKK/USD {da_fmt(".4f", dkk_rate)}</span>'
+            "</div>"
+        )
+
+    html += f'<p class="text-xs text-gray-400 mt-2">Updated {ts}</p>'
+    html += "</div></div></div>"
+    return html
+
+
+# --- Strike transform ---
+
+STRIKE_PAIRS = [
+    ("BTC/USDT", "$"),
+    ("BTC/EUR", "\u20ac"),
+    ("USDT/EUR", ""),
+    ("EUR/BTC", ""),
+]
+
+
+def format_strike_amount(prefix: str, amount) -> str:
+    if amount is None:
+        return "\u2014"
+    v = float(amount)
+    if prefix in ("$", "\u20ac"):
+        return f'{prefix}{da_fmt(",.2f", v)}'
+    return str(amount)
+
+
+def strike_json_to_html(text: str) -> str:
+    rates = json.loads(text)
+    sats = rates.get("quote-sats")
+
+    html = (
+        '<div id="strike-display">'
+        '<div class="rounded-2xl shadow-sm border border-gray-200 p-6" style="background:#f3f4f6;">'
+    )
+
+    if sats is not None:
+        html += (
+            '<p class="text-center text-2xl font-bold mb-3" style="color:#1e3a5f;">'
+            f'{da_fmt(",d", sats)} <span style="color:#1e3a5f;">sats</span></p>'
+        )
+
+    html += '<div style="display:grid;grid-template-columns:1fr;row-gap:0.25rem;">'
+
+    for pair, prefix in STRIKE_PAIRS:
+        amount = rates.get(pair)
+        html += (
+            '<div style="display:flex;justify-content:space-between;align-items:center;padding:0.25rem 0;">'
+            f'<span class="text-sm text-gray-500">{pair}</span>'
+            f'<span class="text-sm font-bold text-gray-900">{format_strike_amount(prefix, amount)}</span>'
+            "</div>"
+        )
+
+    html += "</div></div></div>"
+    return html
+
+
+# --- WebSocket proxy ---
+
+
+def _btcdata_ws_url(path: str) -> str:
+    return BTCDATA_URL.replace("http", "ws", 1) + path
+
+
+async def _ws_proxy(browser_ws: WebSocket, upstream_path: str, transform):
+    await browser_ws.accept()
+    upstream_url = _btcdata_ws_url(upstream_path)
+    logger.info("Browser connected, proxying to %s", upstream_url)
+
+    try:
+        async with websockets.connect(upstream_url, ping_interval=None) as upstream:
+            async for message in upstream:
+                if not message:
+                    continue
+                try:
+                    html = transform(message)
+                    await browser_ws.send_text(html)
+                except WebSocketDisconnect:
+                    break
+                except Exception:
+                    logger.debug("Error forwarding to browser", exc_info=True)
+                    break
+    except WebSocketDisconnect:
+        pass
+    except Exception:
+        logger.debug("Upstream connection error", exc_info=True)
+    finally:
+        try:
+            await browser_ws.close()
+        except Exception:
+            pass
+
+
+@app.websocket("/ws/price")
+async def ws_price(websocket: WebSocket):
+    await _ws_proxy(websocket, "/api/price/ws", price_json_to_html)
+
+
+@app.websocket("/ws/strike")
+async def ws_strike(websocket: WebSocket):
+    await _ws_proxy(websocket, "/api/strike/ws", strike_json_to_html)

bb.edn

@@ -1,13 +0,0 @@
-{:tasks
- {:run     {:doc  "Start dev server"
-            :task (shell "clj -M:dev")}
-  :nrepl   {:doc  "Start nREPL"
-            :task (shell "clj -M:dev:nrepl")}
-  :cider   {:doc  "Start CIDER"
-            :task (shell "clj -M:dev:cider")}
-  :test    {:doc  "Run tests"
-            :task (shell "clj -M:test")}
-  :uberjar {:doc  "Build uberjar"
-            :task (shell "clj -T:build all")}
-  :format  {:doc  "Format code"
-            :task (shell "clj -M:dev -m cljstyle.main fix src test")}}}

build.clj

@@ -1,28 +0,0 @@
-(ns build
-  (:require [clojure.tools.build.api :as b]))
-
-(def lib 'pmagnus/btcprice)
-(def version "0.0.1-SNAPSHOT")
-(def target-dir "target")
-(def class-dir (str target-dir "/classes"))
-
-(def basis (delay (b/create-basis {:project "deps.edn"})))
-(def uber-file (str target-dir "/btcprice-standalone.jar"))
-
-(defn clean [_]
-  (b/delete {:path target-dir}))
-
-(defn uber [_]
-  (clean nil)
-  (b/copy-dir {:src-dirs   ["src/clj" "resources" "env/prod/resources" "env/prod/clj"]
-               :target-dir class-dir})
-  (b/compile-clj {:basis      @basis
-                  :ns-compile '[pmagnus.btcprice.core]
-                  :class-dir  class-dir})
-  (b/uber {:class-dir class-dir
-           :uber-file uber-file
-           :basis     @basis
-           :main      'pmagnus.btcprice.core}))
-
-(defn all [_]
-  (uber nil))

deps.edn

@@ -1,55 +0,0 @@
-{:paths ["src/clj" "resources"]
- :deps {org.clojure/clojure                  {:mvn/version "1.12.3"}
-        ;; Kit
-        io.github.kit-clj/kit-core           {:mvn/version "1.0.6"}
-
-        ;; Logging
-        ch.qos.logback/logback-classic       {:mvn/version "1.5.20"}
-
-        ;; HTTP Server
-        io.github.kit-clj/kit-undertow       {:mvn/version "1.0.10"}
-
-        ;; Routing
-        metosin/reitit                       {:mvn/version "0.9.2"}
-        metosin/reitit-ring                  {:mvn/version "0.9.2"}
-        metosin/reitit-middleware            {:mvn/version "0.9.2"}
-        metosin/reitit-swagger               {:mvn/version "0.9.2"}
-        metosin/reitit-swagger-ui            {:mvn/version "0.9.2"}
-        metosin/reitit-malli                 {:mvn/version "0.9.2"}
-
-        ;; Web
-        ring/ring-core                       {:mvn/version "1.15.3"}
-        ring/ring-defaults                   {:mvn/version "0.7.0"}
-        metosin/ring-http-response           {:mvn/version "0.9.5"}
-        hiccup/hiccup                        {:mvn/version "2.0.0"}
-
-        ;; Serialization
-        metosin/muuntaja                     {:mvn/version "0.6.11"}
-        luminus-transit/luminus-transit       {:mvn/version "0.1.6"}
-        org.clojure/data.json                {:mvn/version "2.5.1"}}
-
- :aliases
- {:build {:deps {io.github.clojure/tools.build {:mvn/version "0.10.9"}}
-          :ns-default build}
-
-  :dev {:extra-paths ["env/dev/clj" "env/dev/resources" "test/clj"]
-        :extra-deps  {integrant/repl                   {:mvn/version "0.5.0"}
-                      criterium/criterium               {:mvn/version "0.4.6"}
-                      expound/expound                   {:mvn/version "0.9.0"}
-                      com.lambdaisland/classpath        {:mvn/version "0.4.44"}
-                      ring/ring-devel                   {:mvn/version "1.15.3"}}}
-
-  :test {:extra-paths ["env/test/resources"]
-         :extra-deps  {io.github.cognitect-labs/test-runner {:git/tag "v0.5.1" :git/sha "dfb30dd"}
-                       peridot/peridot                      {:mvn/version "0.5.4"}
-                       clj-commons/byte-streams              {:mvn/version "0.3.4"}}
-         :main-opts   ["-m" "cognitect.test-runner"]
-         :exec-fn     cognitect.test-runner.api/test}
-
-  :nrepl {:extra-deps {nrepl/nrepl {:mvn/version "1.3.1"}}
-          :main-opts  ["-m" "nrepl.cmdline"
-                       "--middleware" "[integrant.repl/middleware]"]}
-
-  :cider {:extra-deps {cider/cider-nrepl {:mvn/version "0.55.7"}}
-          :main-opts  ["-m" "nrepl.cmdline"
-                       "--middleware" "[cider.nrepl/cider-middleware]"]}}}

env/dev/clj/pmagnus/btcprice/dev_middleware.clj

@@ -1,4 +0,0 @@
-(ns pmagnus.btcprice.dev-middleware)
-
-(defn wrap-dev [handler _opts]
-  handler)

env/dev/clj/pmagnus/btcprice/env.clj

@@ -1,11 +0,0 @@
-(ns pmagnus.btcprice.env
-  (:require
-   [clojure.tools.logging :as log]
-   [pmagnus.btcprice.dev-middleware :refer [wrap-dev]]))
-
-(def defaults
-  {:init       (fn [] (log/info "\n-=[btcprice starting...dev/test profile]=-"))
-   :start      (fn [] (log/info "\n-=[btcprice started...dev/test profile]=-"))
-   :stop       (fn [] (log/info "\n-=[btcprice has shut down]=-"))
-   :middleware wrap-dev
-   :opts       {:profile :dev}})

env/dev/clj/user.clj

@@ -1,25 +0,0 @@
-(ns user
-  (:require
-   [integrant.core :as ig]
-   [integrant.repl :refer [go halt reset reset-all set-prep!]]
-   [integrant.repl.state :as state]
-   [pmagnus.btcprice.config :as config]
-   [pmagnus.btcprice.core]))
-
-(defn dev-prep! []
-  (set-prep!
-   (fn []
-     (-> (config/system-config {:profile :dev})
-         (ig/expand)))))
-
-(defn test-prep! []
-  (set-prep!
-   (fn []
-     (-> (config/system-config {:profile :test})
-         (ig/expand)))))
-
-(comment
-  (dev-prep!)
-  (go)
-  (reset)
-  (halt))

env/dev/resources/logback.xml

@@ -1,15 +0,0 @@
-<configuration>
-  <statusListener class="ch.qos.logback.core.status.NopStatusListener" />
-  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
-    <encoder>
-      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
-    </encoder>
-  </appender>
-  <root level="INFO">
-    <appender-ref ref="STDOUT" />
-  </root>
-  <logger name="pmagnus.btcprice" level="DEBUG" />
-  <logger name="org.eclipse.jetty" level="WARN" />
-  <logger name="io.undertow" level="WARN" />
-  <logger name="org.xnio" level="WARN" />
-</configuration>

env/prod/clj/pmagnus/btcprice/env.clj

@@ -1,10 +0,0 @@
-(ns pmagnus.btcprice.env
-  (:require
-   [clojure.tools.logging :as log]))
-
-(def defaults
-  {:init       (fn [] (log/info "\n-=[btcprice starting]=-"))
-   :start      (fn [] (log/info "\n-=[btcprice started successfully]=-"))
-   :stop       (fn [] (log/info "\n-=[btcprice has shut down successfully]=-"))
-   :middleware (fn [handler _] handler)
-   :opts       {:profile :prod}})

env/prod/resources/logback.xml

@@ -1,14 +0,0 @@
-<configuration>
-  <statusListener class="ch.qos.logback.core.status.NopStatusListener" />
-  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
-    <encoder>
-      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
-    </encoder>
-  </appender>
-  <root level="INFO">
-    <appender-ref ref="STDOUT" />
-  </root>
-  <logger name="org.eclipse.jetty" level="WARN" />
-  <logger name="io.undertow" level="WARN" />
-  <logger name="org.xnio" level="WARN" />
-</configuration>

env/test/resources/logback.xml

@@ -1,11 +0,0 @@
-<configuration>
-  <statusListener class="ch.qos.logback.core.status.NopStatusListener" />
-  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
-    <encoder>
-      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
-    </encoder>
-  </appender>
-  <root level="ERROR">
-    <appender-ref ref="STDOUT" />
-  </root>
-</configuration>

kit.edn

@@ -1,8 +0,0 @@
-{:full-name "pmagnus/btcprice"
- :ns-name   "pmagnus.btcprice"
- :sanitized "pmagnus/btcprice"
- :name      "btcprice"
- :modules   {:root         "modules"
-             :repositories [{:url  "https://github.com/kit-clj/modules.git"
-                             :tag  "master"
-                             :name "kit-modules"}]}}

modules/install-log.edn

@@ -1 +0,0 @@
-{}

requirements.txt

@@ -0,0 +1,3 @@
+fastapi>=0.115
+uvicorn[standard]>=0.34
+websockets>=14.0

resources/css/input.css

@@ -1,2 +1,2 @@
 @import "tailwindcss";
-@source "../../src/**/*.clj";
+@source "../../app/**/*.py";

resources/public/favicon.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><text y=".9em" font-size="90">₿</text></svg>

resources/system.edn

@@ -1,43 +0,0 @@
-{:system/env #profile {:dev :dev :test :test :prod :prod}
-
- :server/http
- {:port    #long #or [#env PORT 4000]
-  :host    #or [#env HTTP_HOST "0.0.0.0"]
-  :handler #ig/ref :handler/ring}
-
- :handler/ring
- {:router    #ig/ref :router/core
-  :api-path  "/api"
-  :site-defaults-config
-  {:params    {:keywordize true
-               :multipart  true
-               :nested     true}
-   :cookies   true
-   :session   {:flash        true
-               :cookie-attrs {:http-only true
-                              :same-site :strict}}
-   :security  {:anti-forgery   false
-               :xss-protection {:enable? true :mode :block}
-               :frame-options  :sameorigin}
-   :static    {:resources "public"}
-   :responses {:not-modified-responses true
-               :absolute-redirects     true
-               :content-types          true
-               :default-charset        "utf-8"}}}
-
- :router/routes
- {:routes #ig/refset :reitit/routes}
-
- :router/core
- {:routes #ig/ref :router/routes
-  :env    #ig/ref :system/env}
-
- :reitit.routes/api
- {:base-path "/api"}
-
- :reitit.routes/ui
- {:base-path ""}
-
- :reitit.routes/ws-proxy
- {:base-path   ""
-  :btcdata-url #or [#env BTCDATA_URL "http://localhost:4100"]}}

src/clj/pmagnus/btcprice/config.clj

@@ -1,8 +0,0 @@
-(ns pmagnus.btcprice.config
-  (:require
-   [kit.config :as config]))
-
-(def ^:const system-filename "system.edn")
-
-(defn system-config [options]
-  (config/read-config system-filename options))

src/clj/pmagnus/btcprice/core.clj

@@ -1,38 +0,0 @@
-(ns pmagnus.btcprice.core
-  (:require
-   [clojure.tools.logging :as log]
-   [integrant.core :as ig]
-   [pmagnus.btcprice.config :as config]
-   [pmagnus.btcprice.env :refer [defaults]]
-
-   ;; Edges
-   [kit.edge.server.undertow]
-   [pmagnus.btcprice.web.handler]
-   ;; Routes
-   [pmagnus.btcprice.web.routes.api]
-   [pmagnus.btcprice.web.routes.ui]
-   [pmagnus.btcprice.web.routes.ws-proxy])
-  (:gen-class))
-
-(defonce system (atom nil))
-
-(defn stop-app []
-  ((or (:stop defaults) (fn [])))
-  (some-> (deref system) (ig/halt!))
-  (shutdown-agents))
-
-(defn start-app [& [params]]
-  ((or (:init defaults) (fn [])))
-  (->> (config/system-config (or params {}))
-       (ig/expand)
-       (ig/init)
-       (reset! system))
-  ((or (:start defaults) (fn []))))
-
-(defn -main [& _]
-  (Thread/setDefaultUncaughtExceptionHandler
-   (reify Thread$UncaughtExceptionHandler
-     (uncaughtException [_ _thread ex]
-       (log/error ex "Uncaught exception"))))
-  (start-app)
-  (.addShutdownHook (Runtime/getRuntime) (Thread. stop-app)))

src/clj/pmagnus/btcprice/web/controllers/health.clj

@@ -1,11 +0,0 @@
-(ns pmagnus.btcprice.web.controllers.health
-  (:require
-   [ring.util.http-response :as response])
-  (:import
-   [java.lang.management ManagementFactory]))
-
-(defn healthcheck! [_req]
-  (response/ok
-   {:time    (str (java.time.Instant/now))
-    :up-time (.. ManagementFactory getRuntimeMXBean getUptime)
-    :app     {:status "up"}}))

src/clj/pmagnus/btcprice/web/handler.clj

@@ -1,31 +0,0 @@
-(ns pmagnus.btcprice.web.handler
-  (:require
-   [integrant.core :as ig]
-   [reitit.ring :as ring]
-   [pmagnus.btcprice.web.middleware.core :as middleware]))
-
-(defmethod ig/init-key :handler/ring
-  [_ {:keys [router api-path] :as opts}]
-  (ring/ring-handler
-   (router)
-   (ring/routes
-    (ring/create-resource-handler {:path "/"})
-    (when (some? api-path)
-      (reitit.ring/create-default-handler))
-    (ring/create-default-handler
-     {:not-found          (constantly {:status 404 :body "Page not found"})
-      :method-not-allowed (constantly {:status 405 :body "Not allowed"})
-      :not-acceptable     (constantly {:status 406 :body "Not acceptable"})}))
-   {:middleware [(middleware/wrap-base opts)]}))
-
-(defmethod ig/init-key :router/routes
-  [_ {:keys [routes]}]
-  (mapv (fn [route]
-          (if (fn? route) (route) route))
-        routes))
-
-(defmethod ig/init-key :router/core
-  [_ {:keys [routes env]}]
-  (if (= env :dev)
-    (fn [] (ring/router routes))
-    (constantly (ring/router routes))))

src/clj/pmagnus/btcprice/web/htmx.clj

@@ -1,32 +0,0 @@
-(ns pmagnus.btcprice.web.htmx
-  (:require
-   [hiccup2.core :as h]))
-
-(defmacro page
-  [opts & content]
-  `(let [opts# ~opts]
-     {:status  200
-      :headers {"Content-Type" "text/html; charset=utf-8"}
-      :body    (str
-                (h/html
-                 (hiccup2.core/raw "<!DOCTYPE html>")
-                 [:html {:lang (or (:lang opts#) "en")}
-                  [:head
-                   [:meta {:charset "utf-8"}]
-                   [:meta {:name "viewport" :content "width=device-width, initial-scale=1"}]
-                   [:meta {:name "apple-mobile-web-app-capable" :content "yes"}]
-                   [:meta {:name "apple-mobile-web-app-status-bar-style" :content "black-translucent"}]
-                   [:title (or (:title opts#) "BTC Price")]
-                   [:link {:rel "stylesheet" :href "/css/output.css"}]
-                   [:script {:src "https://unpkg.com/htmx.org@2/dist/htmx.min.js"}]
-                   [:script {:src "https://unpkg.com/htmx-ext-ws@2/ws.js"}]]
-                  [:body
-                   [:div.mx-auto.max-w-lg.px-4.py-6
-                    ~@content]]]))}))
-
-(defmacro fragment
-  [opts & content]
-  `(let [_opts# ~opts]
-     {:status  200
-      :headers {"Content-Type" "text/html; charset=utf-8"}
-      :body    (str (h/html ~@content))}))

src/clj/pmagnus/btcprice/web/middleware/core.clj

@@ -1,19 +0,0 @@
-(ns pmagnus.btcprice.web.middleware.core
-  (:require
-   [ring.middleware.defaults :as defaults]))
-
-(defn- wrap-nil-guard
-  "Discard responses with no :status — these are artifacts of ring-defaults
-   middleware wrapping a nil response (e.g., from a raw WebSocket upgrade).
-   Passes through :undertow/websocket responses for the adapter to handle."
-  [handler]
-  (fn [request]
-    (let [resp (handler request)]
-      (when (or (:status resp) (:undertow/websocket resp)) resp))))
-
-(defn wrap-base [{:keys [site-defaults-config]}]
-  (fn [handler]
-    (-> handler
-        (defaults/wrap-defaults
-         (or site-defaults-config defaults/site-defaults))
-        (wrap-nil-guard))))

src/clj/pmagnus/btcprice/web/middleware/exception.clj

@@ -1,21 +0,0 @@
-(ns pmagnus.btcprice.web.middleware.exception
-  (:require
-   [clojure.tools.logging :as log]
-   [reitit.ring.middleware.exception :as exception]))
-
-(defn- handler [message exception request]
-  (let [uri (:uri request)]
-    (log/error exception (str message " at " uri))
-    {:status 500
-     :body   {:message   message
-              :exception (.getClass exception)
-              :data      (ex-data exception)
-              :uri       uri}}))
-
-(def exception-middleware
-  (exception/create-exception-middleware
-   (merge
-    exception/default-handlers
-    {::exception/default (partial handler "Internal error")
-     ::exception/wrap    (fn [handler e request]
-                           (handler e request))})))

src/clj/pmagnus/btcprice/web/middleware/formats.clj

@@ -1,12 +0,0 @@
-(ns pmagnus.btcprice.web.middleware.formats
-  (:require
-   [luminus-transit.time :as time]
-   [muuntaja.core :as m]))
-
-(def instance
-  (m/create
-   (-> m/default-options
-       (update-in [:formats "application/transit+json" :decoder-opts]
-                  (partial merge time/time-deserialization-handlers))
-       (update-in [:formats "application/transit+json" :encoder-opts]
-                  (partial merge time/time-serialization-handlers)))))

src/clj/pmagnus/btcprice/web/routes/api.clj

@@ -1,41 +0,0 @@
-(ns pmagnus.btcprice.web.routes.api
-  (:require
-   [integrant.core :as ig]
-   [pmagnus.btcprice.web.controllers.health :as health]
-   [pmagnus.btcprice.web.middleware.exception :as exception]
-   [pmagnus.btcprice.web.middleware.formats :as formats]
-   [reitit.coercion.malli :as malli]
-   [reitit.ring.coercion :as coercion]
-   [reitit.ring.middleware.muuntaja :as muuntaja]
-   [reitit.ring.middleware.parameters :as parameters]
-   [reitit.swagger :as swagger]))
-
-(defn- api-routes [_opts]
-  [["/swagger.json"
-    {:get {:no-doc  true
-           :swagger {:info {:title "btcprice API"}}
-           :handler (swagger/create-swagger-handler)}}]
-   ["/health"
-    {:get health/healthcheck!}]])
-
-(defn route-data [opts]
-  (merge
-   opts
-   {:coercion   malli/coercion
-    :muuntaja   formats/instance
-    :swagger    {:id ::api}
-    :middleware [parameters/parameters-middleware
-                muuntaja/format-negotiate-middleware
-                muuntaja/format-response-middleware
-                exception/exception-middleware
-                muuntaja/format-request-middleware
-                coercion/coerce-request-middleware
-                coercion/coerce-response-middleware]}))
-
-(derive :reitit.routes/api :reitit/routes)
-
-(defmethod ig/init-key :reitit.routes/api
-  [_ {:keys [base-path]
-      :or   {base-path ""}
-      :as   opts}]
-  [base-path (route-data opts) (api-routes opts)])

src/clj/pmagnus/btcprice/web/routes/ui.clj

@@ -1,48 +0,0 @@
-(ns pmagnus.btcprice.web.routes.ui
-  (:require
-   [integrant.core :as ig]
-   [pmagnus.btcprice.web.htmx :refer [page]]
-   [pmagnus.btcprice.web.middleware.exception :as exception]
-   [pmagnus.btcprice.web.middleware.formats :as formats]
-   [reitit.ring.middleware.muuntaja :as muuntaja]
-   [reitit.ring.middleware.parameters :as parameters]))
-
-(defn- home-page [_opts _req]
-  (page {:title "BTC Price"}
-    [:header.text-center.mb-8
-     [:h1.text-3xl.font-bold.text-gray-900 "BTC Price"]
-     [:p.text-sm.text-gray-500.mt-1 "Bitcoin price tracker"]]
-
-    [:div#price-panel {:hx-ext "ws" :ws-connect "/ws/price"}
-     [:div#price-display
-      [:div.bg-white.rounded-2xl.shadow-sm.border.border-gray-200.p-6
-       [:p.text-center.text-gray-400.text-sm "Connecting..."]]]]
-
-    [:div.mt-4 {:hx-ext "ws" :ws-connect "/ws/strike"}
-     [:div#strike-display
-      [:div.bg-white.rounded-2xl.shadow-sm.border.border-gray-200.p-6
-       [:p.text-center.text-gray-400.text-sm "Loading Strike rates..."]]]]
-
-    ;; Safelist classes used in btcdata HTML fragments
-    [:div {:class "hidden text-4xl text-2xl font-bold text-green-600 text-red-600 text-gray-900 text-xs text-gray-400 mt-2 flex justify-center justify-between items-center gap-4 mt-1 mt-3 text-sm text-gray-600 text-gray-500 mb-3 py-1 grid grid-cols-2 gap-x-6 gap-y-1"
-           :aria-hidden "true"}]))
-
-(defn- ui-routes [opts]
-  [["/"
-    {:get (fn [req] (home-page opts req))}]])
-
-(defn route-data [opts]
-  (merge
-   opts
-   {:muuntaja   formats/instance
-    :middleware [parameters/parameters-middleware
-                muuntaja/format-response-middleware
-                exception/exception-middleware]}))
-
-(derive :reitit.routes/ui :reitit/routes)
-
-(defmethod ig/init-key :reitit.routes/ui
-  [_ {:keys [base-path]
-      :or   {base-path ""}
-      :as   opts}]
-  [base-path (route-data opts) (ui-routes opts)])

src/clj/pmagnus/btcprice/web/routes/utils.clj

@@ -1,9 +0,0 @@
-(ns pmagnus.btcprice.web.routes.utils)
-
-(def route-data-path [:reitit.core/match :data])
-
-(defn route-data [req]
-  (get-in req route-data-path))
-
-(defn route-data-key [req k]
-  (get (route-data req) k))

src/clj/pmagnus/btcprice/web/routes/ws_proxy.clj

@@ -1,159 +0,0 @@
-(ns pmagnus.btcprice.web.routes.ws-proxy
-  (:require
-   [clojure.data.json :as json]
-   [clojure.tools.logging :as log]
-   [integrant.core :as ig])
-  (:import
-   [io.undertow.websockets.core WebSockets WebSocketChannel]
-   [java.net URI]
-   [java.net.http HttpClient WebSocket$Builder WebSocket$Listener]
-   [java.time Instant ZoneId]
-   [java.time.format DateTimeFormatter]
-   [java.util Locale]
-   [java.util.concurrent CompletableFuture]))
-
-(defn- close-quietly [^WebSocketChannel ch]
-  (when (and ch (.isOpen ch))
-    (try (.close ch) (catch Exception _))))
-
-(defn- close-upstream-quietly [^java.net.http.WebSocket ws]
-  (when ws
-    (try (.sendClose ws java.net.http.WebSocket/NORMAL_CLOSURE "") (catch Exception _))))
-
-(defn- connect-upstream
-  "Open a Java HttpClient WebSocket to btcdata, transform each text frame
-   with xf, and send the result to the browser channel."
-  [^String btcdata-ws-url ^WebSocketChannel browser-ch xf]
-  (let [client   (HttpClient/newHttpClient)
-        listener (reify java.net.http.WebSocket$Listener
-                   (onOpen [_ ws]
-                     (.request ws 1))
-                   (onText [_ ws data last?]
-                     (let [text (str data)]
-                       (try
-                         (when (and (.isOpen browser-ch) (seq text))
-                           (WebSockets/sendTextBlocking (xf text) browser-ch))
-                         (catch Exception e
-                           (log/debug e "Error forwarding to browser")
-                           (close-upstream-quietly ws))))
-                     (.request ws 1)
-                     (CompletableFuture/completedFuture nil))
-                   (onClose [_ _ws status-code _reason]
-                     (log/debug "Upstream closed" status-code)
-                     (close-quietly browser-ch))
-                   (onError [_ _ws error]
-                     (log/debug error "Upstream error")
-                     (close-quietly browser-ch)))]
-    (-> (.newWebSocketBuilder client)
-        ^WebSocket$Builder identity
-        (.buildAsync (URI. btcdata-ws-url) listener)
-        (.join))))
-
-(defn- ws-handler [btcdata-ws-url xf _req]
-  (let [upstream-atom (atom nil)]
-    {:undertow/websocket
-     {:on-open
-      (fn [{:keys [^WebSocketChannel channel]}]
-        (log/info "Browser connected, proxying to" btcdata-ws-url)
-        (reset! upstream-atom (connect-upstream btcdata-ws-url channel xf)))
-      :on-close-message
-      (fn [_]
-        (log/debug "Browser closed")
-        (close-upstream-quietly @upstream-atom))}}))
-
-;; --- Price rendering ---
-
-(def ^:private ts-fmt (DateTimeFormatter/ofPattern "dd-MM HH:mm:ss"))
-(def ^:private da-locale (Locale. "da" "DK"))
-
-(defn- da-fmt [fmt val]
-  (String/format da-locale fmt (into-array Object [val])))
-
-(defn- price-json->html [text]
-  (let [{:strs [price prev_price recorded_at
-                price_eur price_dkk]} (json/read-str text)
-        p     (double (bigdec price))
-        pp    (when prev_price (double (bigdec prev_price)))
-        color (cond
-                (nil? pp) "text-gray-900"
-                (> p pp)  "text-green-600"
-                (< p pp)  "text-red-600"
-                :else     "text-gray-900")
-        ts    (.format (.atZone (Instant/parse recorded_at) (ZoneId/systemDefault)) ts-fmt)]
-    (str "<div id=\"price-display\">"
-         "<div class=\"bg-white rounded-2xl shadow-sm border border-gray-200 p-6\">"
-         "<div class=\"text-center\">"
-         "<p class=\"text-4xl font-bold " color "\">$" (da-fmt "%,.2f" p) "</p>"
-         (when price_eur
-           (let [p-eur (double (bigdec price_eur))
-                 p-dkk (double (bigdec price_dkk))
-                 eur   (/ p-eur p)
-                 dkk   (/ p-dkk p)]
-             (str "<div class=\"flex justify-center gap-4 mt-3\">"
-                  "<span class=\"text-2xl font-bold text-gray-600\">\u20AC" (da-fmt "%,.0f" p-eur) "</span>"
-                  "<span class=\"text-2xl font-bold text-gray-600\">" (da-fmt "%,.0f" p-dkk) " kr</span>"
-                  "</div>"
-                  "<div class=\"flex justify-center gap-4 mt-1\">"
-                  "<span class=\"text-xs text-gray-400\">EUR/USD " (da-fmt "%.4f" eur) "</span>"
-                  "<span class=\"text-xs text-gray-400\">DKK/USD " (da-fmt "%.4f" dkk) "</span>"
-                  "</div>")))
-         "<p class=\"text-xs text-gray-400 mt-2\">Updated " ts "</p>"
-         "</div></div></div>")))
-
-;; --- Strike rendering ---
-
-(def ^:private strike-pairs
-  [["BTC/USDT" "$"]
-   ["BTC/EUR"  "\u20AC"]
-   ["USDT/EUR" ""]
-   ["EUR/BTC"  ""]])
-
-(defn- format-strike-amount [prefix amount]
-  (if amount
-    (let [v (double (bigdec amount))]
-      (case prefix
-        "$"      (str prefix (da-fmt "%,.2f" v))
-        "\u20AC" (str prefix (da-fmt "%,.2f" v))
-        amount))
-    "\u2014"))
-
-(defn- strike-json->html [text]
-  (let [rates (json/read-str text)
-        sats  (get rates "quote-sats")]
-    (str "<div id=\"strike-display\">"
-         "<div class=\"rounded-2xl shadow-sm border border-gray-200 p-6\" style=\"background:#f3f4f6;\">"
-         (if sats
-           (str "<p class=\"text-center text-2xl font-bold mb-3\" style=\"color:#1e3a5f;\">"
-                (da-fmt "%,d" sats) " <span style=\"color:#1e3a5f;\">sats</span></p>")
-           "")
-         "<div style=\"display:grid;grid-template-columns:1fr;row-gap:0.25rem;\">"
-         (apply str
-           (for [[pair prefix] strike-pairs
-                 :let [amount (get rates pair)]]
-             (str "<div style=\"display:flex;justify-content:space-between;align-items:center;padding:0.25rem 0;\">"
-                  "<span class=\"text-sm text-gray-500\">" pair "</span>"
-                  "<span class=\"text-sm font-bold text-gray-900\">"
-                  (format-strike-amount prefix amount)
-                  "</span></div>")))
-         "</div></div></div>")))
-
-;; --- Routes ---
-
-(defn- ws-proxy-routes [{:keys [btcdata-url]}]
-  (let [ws-base (str (.replaceFirst ^String btcdata-url "^http" "ws"))]
-    [["/ws/price"
-      {:get        (fn [req] (ws-handler (str ws-base "/api/price/ws") price-json->html req))
-       :no-doc     true
-       :middleware []}]
-     ["/ws/strike"
-      {:get        (fn [req] (ws-handler (str ws-base "/api/strike/ws") strike-json->html req))
-       :no-doc     true
-       :middleware []}]]))
-
-(derive :reitit.routes/ws-proxy :reitit/routes)
-
-(defmethod ig/init-key :reitit.routes/ws-proxy
-  [_ {:keys [base-path]
-      :or   {base-path ""}
-      :as   opts}]
-  [base-path {} (ws-proxy-routes opts)])

tailwind.config.js

@@ -1,5 +1,5 @@
 module.exports = {
-  content: ["./src/**/*.clj", "./resources/**/*.html"],
+  content: ["./app/**/*.py", "./resources/**/*.html"],
   theme: { extend: {} },
   plugins: []
 }

test/clj/pmagnus/btcprice/core_test.clj

@@ -1,6 +0,0 @@
-(ns pmagnus.btcprice.core-test
-  (:require
-   [clojure.test :refer [deftest is]]))
-
-(deftest app-loads-test
-  (is (= 1 1)))

test/clj/pmagnus/btcprice/test_utils.clj

@@ -1,21 +0,0 @@
-(ns pmagnus.btcprice.test-utils
-  (:require
-   [integrant.core :as ig]
-   [integrant.repl.state :as state]
-   [pmagnus.btcprice.config :as config]
-   [pmagnus.btcprice.core :as core]))
-
-(defn system-state []
-  (or @core/system state/system))
-
-(defn system-fixture []
-  (fn [f]
-    (let [system (-> (config/system-config {:profile :test})
-                     (ig/prep)
-                     (ig/init))]
-      (reset! core/system system)
-      (try
-        (f)
-        (finally
-          (ig/halt! system)
-          (reset! core/system nil))))))

test/clj/pmagnus/btcprice/web/request_test.clj

@@ -1,13 +0,0 @@
-(ns pmagnus.btcprice.web.request-test
-  (:require
-   [clojure.test :refer [deftest is use-fixtures]]
-   [pmagnus.btcprice.test-utils :as tu]))
-
-(use-fixtures :once (tu/system-fixture))
-
-(deftest health-request-test
-  (let [sys (tu/system-state)
-        app (get sys :handler/ring)]
-    (when app
-      (let [resp (app {:request-method :get :uri "/api/health"})]
-        (is (= 200 (:status resp)))))))