Add Fornax coordinator — simple round-robin qBittorrent proxy

Python proxy running on python:3-alpine via ConfigMap. Routes /api/v2/torrents/add
across all three workers in round-robin; proxies status/monitoring to primary.
Manages independent SID sessions to each backend with auto-refresh on 403.
Service: fornax.media.svc:8080 — point Sonarr/Radarr here instead of qbittorrent.

servers/legion/k8s/media/fornax-coordinator.yaml

@@ -0,0 +1,167 @@
+# Fornax coordinator — simple round-robin proxy in front of all qBittorrent workers
+# Distributes torrent-add requests across workers; proxies monitoring to primary.
+# Sonarr/Radarr point here instead of directly at qbittorrent.
+# Replace with the full Fornax coordinator once that's built.
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: fornax-coordinator-script
+  namespace: media
+data:
+  coordinator.py: |
+    #!/usr/bin/env python3
+    """
+    Fornax coordinator — round-robin proxy for qBittorrent API.
+    - POST /api/v2/torrents/add  → round-robins across all backends
+    - Everything else            → proxied to primary backend (qbittorrent)
+    Manages its own SID sessions to each backend so auth is transparent.
+    """
+    import itertools, os, urllib.request, urllib.parse
+    from http.server import HTTPServer, BaseHTTPRequestHandler
+
+    BACKENDS = [b.strip() for b in os.environ.get("BACKENDS", "").split(",") if b.strip()]
+    USER = os.environ.get("QBT_USER", "admin")
+    PASS = os.environ.get("QBT_PASS", "adminadmin")
+    PRIMARY = BACKENDS[0] if BACKENDS else ""
+    pool = itertools.cycle(BACKENDS)
+    sids = {}
+
+    def fetch_sid(backend):
+        data = urllib.parse.urlencode({"username": USER, "password": PASS}).encode()
+        req = urllib.request.Request(f"{backend}/api/v2/auth/login", data=data)
+        try:
+            with urllib.request.urlopen(req, timeout=5) as r:
+                for k, v in r.getheaders():
+                    if k.lower() == "set-cookie" and "SID=" in v:
+                        return v.split("SID=")[1].split(";")[0]
+        except Exception as e:
+            print(f"auth failed for {backend}: {e}")
+        return None
+
+    def sid(backend):
+        if not sids.get(backend):
+            sids[backend] = fetch_sid(backend)
+        return sids.get(backend, "")
+
+    def forward(backend, method, path, body, content_type):
+        cookie = f"SID={sid(backend)}"
+        headers = {"Cookie": cookie}
+        if content_type:
+            headers["Content-Type"] = content_type
+        req = urllib.request.Request(
+            f"{backend}{path}", data=body if method == "POST" else None,
+            headers=headers, method=method,
+        )
+        try:
+            with urllib.request.urlopen(req, timeout=30) as r:
+                return r.status, r.read(), list(r.getheaders())
+        except urllib.error.HTTPError as e:
+            # SID expired — refresh once and retry
+            if e.code == 403:
+                sids[backend] = fetch_sid(backend)
+                headers["Cookie"] = f"SID={sids[backend]}"
+                req2 = urllib.request.Request(
+                    f"{backend}{path}", data=body if method == "POST" else None,
+                    headers=headers, method=method,
+                )
+                try:
+                    with urllib.request.urlopen(req2, timeout=30) as r:
+                        return r.status, r.read(), list(r.getheaders())
+                except Exception as e2:
+                    return 500, str(e2).encode(), []
+            return e.code, e.read(), []
+        except Exception as e:
+            return 500, str(e).encode(), []
+
+    class Handler(BaseHTTPRequestHandler):
+        def log_message(self, fmt, *args):
+            print(f"{self.command} {self.path} → {args[1] if len(args) > 1 else ''}")
+
+        def _proxy(self, method):
+            length = int(self.headers.get("Content-Length", 0))
+            body = self.rfile.read(length) if length else None
+            ct = self.headers.get("Content-Type", "")
+
+            if method == "POST" and "/api/v2/torrents/add" in self.path:
+                backend = next(pool)
+                print(f"  routing add → {backend}")
+            else:
+                backend = PRIMARY
+
+            status, resp_body, resp_headers = forward(backend, method, self.path, body, ct)
+            self.send_response(status)
+            skip = {"transfer-encoding", "connection"}
+            for k, v in resp_headers:
+                if k.lower() not in skip:
+                    self.send_header(k, v)
+            self.end_headers()
+            self.wfile.write(resp_body)
+
+        def do_GET(self):  self._proxy("GET")
+        def do_POST(self): self._proxy("POST")
+
+    if __name__ == "__main__":
+        print(f"Fornax coordinator ready — backends: {BACKENDS}")
+        HTTPServer(("0.0.0.0", 8080), Handler).serve_forever()
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: fornax-coordinator
+  namespace: media
+  labels:
+    app: fornax-coordinator
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: fornax-coordinator
+  template:
+    metadata:
+      labels:
+        app: fornax-coordinator
+    spec:
+      containers:
+        - name: coordinator
+          image: python:3-alpine
+          command: ["python", "/app/coordinator.py"]
+          env:
+            - name: BACKENDS
+              value: "http://qbittorrent.media.svc:8080,http://fornax-worker-tx253.media.svc:8080,http://fornax-worker-tx34.media.svc:8080"
+            - name: QBT_USER
+              value: "admin"
+            - name: QBT_PASS
+              value: "adminadmin"
+          ports:
+            - containerPort: 8080
+          volumeMounts:
+            - name: script
+              mountPath: /app
+          resources:
+            requests:
+              memory: 32Mi
+              cpu: 10m
+            limits:
+              memory: 128Mi
+              cpu: 100m
+      volumes:
+        - name: script
+          configMap:
+            name: fornax-coordinator-script
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: fornax
+  namespace: media
+  labels:
+    app: fornax-coordinator
+spec:
+  selector:
+    app: fornax-coordinator
+  ports:
+    - name: webui
+      port: 8080
+      targetPort: 8080
+  type: ClusterIP