fixed

modules/server/containers/apps/favicon.nix

@@ -5,6 +5,14 @@ let
   palette = serverCfg.colorScheme.palette or { };
   port = 8080;
   assetSize = 64;
+  cacheMode = containerCfg.extra.cacheMode or "off";
+  cacheControl =
+    if cacheMode == "disk" then
+      containerCfg.extra.cacheControl or "public, max-age=3600"
+    else if cacheMode == "off" then
+      "no-store"
+    else
+      throw "favicon cacheMode must be either `off` or `disk`";
   priority = toString (containerCfg.extra.priority or 2147482647);
   logoSvgFileName = builtins.baseNameOf (toString mediaCfg.logo.svg);
   logoSvgMount = "/assets/${logoSvgFileName}";
@@ -68,7 +76,11 @@ let
   ]);
   serverScript = pkgs.writeText "favicon-server.py" ''
     from io import BytesIO
+    import hashlib
+    import os
+    from pathlib import Path
     import re
+    import threading
     from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
 
     import cairosvg
@@ -78,7 +90,9 @@ let
     LISTEN_HOST = "0.0.0.0"
     LISTEN_PORT = ${toString port}
     ASSET_SIZE = ${toString assetSize}
-    CACHE_CONTROL = "no-store"
+    CACHE_MODE = ${builtins.toJSON cacheMode}
+    CACHE_CONTROL = ${builtins.toJSON cacheControl}
+    CACHE_DIR = Path("/cache")
 
     with open(LOGO_PATH, "rb") as fh:
         LOGO_BYTES = fh.read()
@@ -86,6 +100,8 @@ let
     DEFAULT_PROFILE = ${if defaultProfile == null then "None" else builtins.toJSON defaultProfile}
     APP_DOMAIN = (${builtins.toJSON serverCfg.domain} or "").strip().lower()
     DEFAULT_COLORS = {"bg": "#111827", "fg": "#f8fafc"}
+    LOGO_HASH = hashlib.sha256(LOGO_BYTES).hexdigest()
+    ICON_CACHE_LOCK = threading.Lock()
 
     def _request_host(headers):
         host = (
@@ -113,25 +129,19 @@ let
         return candidates
 
     def _profile_for_host(host):
-        candidates = _host_candidates(host)
-        print(f"favicon-profile host={host!r} candidates={candidates!r} mappings={list(MAPPINGS.keys())!r}")
-        for candidate in candidates:
+        for candidate in _host_candidates(host):
             profile = MAPPINGS.get(candidate)
-            print(f"favicon-profile-check candidate={candidate!r} hit={profile is not None}")
             if profile:
-                print(f"favicon-profile-match candidate={candidate!r} profile={profile!r}")
                 return candidate, profile
-        print(f"favicon-profile-default host={host!r} default={DEFAULT_PROFILE!r}")
         return None, DEFAULT_PROFILE
 
     def _replace_logo_fill(svg, color):
-        svg, count = re.subn(
+        svg, _ = re.subn(
             "fill:#3193f5",
             f"fill:{color}",
             svg,
             flags=re.IGNORECASE,
         )
-        print(f"favicon-fill replace_count={count} color={color}")
         return svg
 
     def _colors(profile):
@@ -154,8 +164,6 @@ let
         svg = LOGO_BYTES.decode("utf-8")
         svg = _replace_logo_fill(svg, colors["fg"])
         svg = _add_background(svg, colors["bg"])
-        print(f"favicon-render fg={colors['fg']} bg={colors['bg']} mode=svg2png")
-        print(f"favicon-svg {svg}")
 
         png = cairosvg.svg2png(
             bytestring=svg.encode("utf-8"),
@@ -168,21 +176,43 @@ let
                 rgba.save(output, format="ICO", sizes=[(ASSET_SIZE, ASSET_SIZE)])
         return output.getvalue()
 
+    def _cache_path(colors):
+        digest = hashlib.sha256(
+            f"{ASSET_SIZE}:{LOGO_HASH}:{colors['bg']}:{colors['fg']}".encode("utf-8")
+        ).hexdigest()
+        return CACHE_DIR / f"{digest}.ico"
+
+    def _payload_for(colors):
+        if CACHE_MODE != "disk":
+            return _render_icon(colors)
+
+        cache_path = _cache_path(colors)
+        with ICON_CACHE_LOCK:
+            if cache_path.exists():
+                return cache_path.read_bytes()
+
+        payload = _render_icon(colors)
+        with ICON_CACHE_LOCK:
+            if cache_path.exists():
+                return cache_path.read_bytes()
+            CACHE_DIR.mkdir(parents=True, exist_ok=True)
+            tmp_path = cache_path.with_suffix(".tmp")
+            tmp_path.write_bytes(payload)
+            os.replace(tmp_path, cache_path)
+            return payload
+
     class Handler(BaseHTTPRequestHandler):
         server_version = "favicon-router/1.0"
 
         def _serve(self, include_body):
             host = _request_host(self.headers)
             matched_host, profile = _profile_for_host(host)
-            print(f"favicon-request host={host!r} matched={matched_host!r} include_body={include_body}")
             if not profile:
-                print("favicon-request no-profile")
                 self.send_error(404, "No favicon mapping for host")
                 return
 
             colors = _colors(profile)
-            print(f"favicon-colors bg={colors['bg']} fg={colors['fg']}")
-            payload = _render_icon(colors)
+            payload = _payload_for(colors)
             self.send_response(200)
             self.send_header("Content-Type", "image/x-icon")
             self.send_header("Content-Length", str(len(payload)))
@@ -222,13 +252,13 @@ let
   };
 in {
   runtime = {
-    # paths = [
-    #   {
-    #     path = "${serverCfg.path.config.path}/favicon";
-    #     mode = "0755";
-    #     dirs = [ "cache" ];
-    #   }
-    # ];
+    paths = [
+      {
+        path = "${serverCfg.path.config.path}/favicon";
+        mode = "0755";
+        dirs = [ "cache" ];
+      }
+    ];
 
     containers = {
       server = builder.mkContainer {
@@ -244,7 +274,7 @@ in {
         };
         overrides = {
           volumes = [
-           # "${serverCfg.path.config.path}/favicon/cache:/cache"
+           "${serverCfg.path.config.path}/favicon/cache:/cache"
             "${mediaCfg.logo.svg}:${logoSvgMount}:ro"
           ];
         };