fix: address P1 security and performance findings

src/comfyui_mcp/audit.py

@@ -2,11 +2,17 @@
 
 from __future__ import annotations
 
+import asyncio
+import logging
+import threading
 from datetime import UTC, datetime
 from pathlib import Path
+from typing import Any
 
 from pydantic import BaseModel, Field, model_serializer
 
+_logger = logging.getLogger(__name__)
+
 _SENSITIVE_KEYS = {"token", "password", "secret", "api_key", "authorization"}
 
 
@@ -51,16 +57,58 @@ def serialize(self) -> dict[str, object]:
 class AuditLogger:
     def __init__(self, audit_file: Path) -> None:
         self._audit_file = Path(audit_file)
+        self._dir_created = False
+        self._lock = threading.Lock()
 
-    def log(self, *, tool: str, action: str, **kwargs) -> AuditRecord:
-        """Write an audit record as a JSON line."""
-        record = AuditRecord(tool=tool, action=action, **kwargs)
+    def _is_path_safe(self) -> bool:
+        """Check that neither the audit file nor any parent is a symlink.
+
+        Uses is_symlink() which detects both live and dangling symlinks
+        (unlike exists() which returns False for dangling symlinks).
+        """
+        if self._audit_file.is_symlink():
+            return False
+        return all(not parent.is_symlink() for parent in self._audit_file.parents)
+
+    def _ensure_dir(self) -> bool:
+        """Create parent directories once. Returns False on failure."""
+        if self._dir_created:
+            return True
         try:
             self._audit_file.parent.mkdir(parents=True, exist_ok=True)
-            with open(self._audit_file, "a") as f:
-                f.write(record.model_dump_json() + "\n")
+            self._dir_created = True
+            return True
         except OSError as e:
-            import logging
+            _logger.error("AUDIT LOG FAILURE: cannot create directory: %s", e)
+            return False
+
+    def _write_record(self, record: AuditRecord) -> None:
+        """Synchronous, thread-safe write of a single audit record."""
+        with self._lock:
+            # Check symlink safety on every write (not cached) to detect
+            # post-init symlink swaps on the file or any parent directory
+            if not self._is_path_safe():
+                _logger.error(
+                    "AUDIT LOG REFUSED: path contains symlink: %s",
+                    self._audit_file,
+                )
+                return
+            if not self._ensure_dir():
+                return
+            try:
+                with open(self._audit_file, "a") as f:
+                    f.write(record.model_dump_json() + "\n")
+            except OSError as e:
+                _logger.error("AUDIT LOG FAILURE: %s", e)
 
-            logging.getLogger(__name__).error("AUDIT LOG FAILURE: %s", e)
+    def log(self, *, tool: str, action: str, **kwargs: Any) -> AuditRecord:
+        """Write an audit record as a JSON line (synchronous)."""
+        record = AuditRecord(tool=tool, action=action, **kwargs)
+        self._write_record(record)
+        return record
+
+    async def async_log(self, *, tool: str, action: str, **kwargs: Any) -> AuditRecord:
+        """Write an audit record without blocking the event loop."""
+        record = AuditRecord(tool=tool, action=action, **kwargs)
+        await asyncio.to_thread(self._write_record, record)
         return record

src/comfyui_mcp/server.py

@@ -2,8 +2,11 @@
 
 from __future__ import annotations
 
+import atexit
+import contextlib
 from pathlib import Path
 
+import httpx
 from mcp.server.fastmcp import FastMCP
 
 from comfyui_mcp.audit import AuditLogger
@@ -83,6 +86,7 @@ def _register_all_tools(
     download_validator: DownloadValidator,
     model_checker: ModelChecker,
     model_search_settings: ModelSearchSettings,
+    search_http: httpx.AsyncClient,
 ) -> None:
     """Register all MCP tool groups with their dependencies."""
     register_discovery_tools(server, client, audit, rate_limiters["read"], sanitizer, node_auditor)
@@ -118,10 +122,13 @@ def _register_all_tools(
         detector=detector,
         validator=download_validator,
         search_settings=model_search_settings,
+        search_http=search_http,
     )
 
 
-def _build_server(settings: Settings | None = None) -> tuple[FastMCP, Settings]:
+def _build_server(
+    settings: Settings | None = None,
+) -> tuple[FastMCP, Settings, ComfyUIClient, httpx.AsyncClient]:
     """Build and configure the MCP server with all tools registered."""
     if settings is None:
         settings = load_settings()
@@ -144,6 +151,7 @@ def _build_server(settings: Settings | None = None) -> tuple[FastMCP, Settings]:
         allowed_extensions=settings.security.allowed_model_extensions,
     )
     model_checker = ModelChecker()
+    search_http = httpx.AsyncClient(timeout=httpx.Timeout(connect=10, read=30, write=10, pool=10))
 
     server_kwargs: dict = {
         "name": "ComfyUI",
@@ -183,13 +191,29 @@ def _build_server(settings: Settings | None = None) -> tuple[FastMCP, Settings]:
         download_validator=download_validator,
         model_checker=model_checker,
         model_search_settings=settings.model_search,
+        search_http=search_http,
     )
 
-    return server, settings
+    return server, settings, client, search_http
 
 
 # Module-level server instance for import and CLI use
-mcp, _settings = _build_server()
+mcp, _settings, _client, _search_http = _build_server()
+
+
+def _cleanup() -> None:
+    """Best-effort cleanup of HTTP clients on process exit."""
+    import asyncio
+
+    async def _close() -> None:
+        await _client.close()
+        await _search_http.aclose()
+
+    with contextlib.suppress(Exception):
+        asyncio.run(_close())
+
+
+atexit.register(_cleanup)
 
 
 def main() -> None:

src/comfyui_mcp/tools/discovery.py

@@ -159,7 +159,7 @@ async def list_models(folder: str = "checkpoints") -> list[str]:
         """List available models in a folder (checkpoints, loras, vae, etc.)."""
         limiter.check("list_models")
         sanitizer.validate_path_segment(folder, label="folder")
-        audit.log(tool="list_models", action="called", extra={"folder": folder})
+        await audit.async_log(tool="list_models", action="called", extra={"folder": folder})
         return await client.get_models(folder)
 
     tool_fns["list_models"] = list_models
@@ -168,7 +168,7 @@ async def list_models(folder: str = "checkpoints") -> list[str]:
     async def list_nodes() -> list[str]:
         """List all available ComfyUI node types."""
         limiter.check("list_nodes")
-        audit.log(tool="list_nodes", action="called")
+        await audit.async_log(tool="list_nodes", action="called")
         info = await client.get_object_info()
         return sorted(info.keys())
 
@@ -178,7 +178,9 @@ async def list_nodes() -> list[str]:
     async def get_node_info(node_class: str) -> dict:
         """Get detailed information about a specific node type."""
         limiter.check("get_node_info")
-        audit.log(tool="get_node_info", action="called", extra={"node_class": node_class})
+        await audit.async_log(
+            tool="get_node_info", action="called", extra={"node_class": node_class}
+        )
         return await client.get_object_info(node_class)
 
     tool_fns["get_node_info"] = get_node_info
@@ -187,7 +189,7 @@ async def get_node_info(node_class: str) -> dict:
     async def list_workflows() -> list:
         """List available workflow templates."""
         limiter.check("list_workflows")
-        audit.log(tool="list_workflows", action="called")
+        await audit.async_log(tool="list_workflows", action="called")
         return await client.get_workflow_templates()
 
     tool_fns["list_workflows"] = list_workflows
@@ -196,7 +198,7 @@ async def list_workflows() -> list:
     async def list_extensions() -> list:
         """List available ComfyUI extensions."""
         limiter.check("list_extensions")
-        audit.log(tool="list_extensions", action="called")
+        await audit.async_log(tool="list_extensions", action="called")
         return await client.get_extensions()
 
     tool_fns["list_extensions"] = list_extensions
@@ -205,7 +207,7 @@ async def list_extensions() -> list:
     async def get_server_features() -> dict:
         """Get ComfyUI server features and capabilities."""
         limiter.check("get_server_features")
-        audit.log(tool="get_server_features", action="called")
+        await audit.async_log(tool="get_server_features", action="called")
         return await client.get_features()
 
     tool_fns["get_server_features"] = get_server_features
@@ -214,7 +216,7 @@ async def get_server_features() -> dict:
     async def list_model_folders() -> list[str]:
         """List available model folder types (checkpoints, loras, vae, etc.)."""
         limiter.check("list_model_folders")
-        audit.log(tool="list_model_folders", action="called")
+        await audit.async_log(tool="list_model_folders", action="called")
         return await client.get_model_types()
 
     tool_fns["list_model_folders"] = list_model_folders
@@ -230,7 +232,7 @@ async def get_model_metadata(folder: str, filename: str) -> dict:
         limiter.check("get_model_metadata")
         sanitizer.validate_path_segment(folder, label="folder")
         sanitizer.validate_path_segment(filename, label="filename")
-        audit.log(
+        await audit.async_log(
             tool="get_model_metadata",
             action="called",
             extra={"folder": folder, "filename": filename},
@@ -250,7 +252,7 @@ async def audit_dangerous_nodes() -> dict:
             Dictionary with dangerous and suspicious node counts and lists
         """
         limiter.check("audit_dangerous_nodes")
-        audit.log(tool="audit_dangerous_nodes", action="started")
+        await audit.async_log(tool="audit_dangerous_nodes", action="started")
 
         auditor = node_auditor if node_auditor else NodeAuditor()
 
@@ -273,7 +275,7 @@ async def audit_dangerous_nodes() -> dict:
             },
         }
 
-        audit.log(
+        await audit.async_log(
             tool="audit_dangerous_nodes",
             action="completed",
             extra={
@@ -300,7 +302,7 @@ async def get_system_info() -> dict:
             queue (running/pending counts).
         """
         limiter.check("get_system_info")
-        audit.log(tool="get_system_info", action="called")
+        await audit.async_log(tool="get_system_info", action="called")
 
         raw = await client.get_system_stats()
         queue_raw = await client.get_queue()
@@ -353,7 +355,7 @@ async def get_model_presets(
             Dictionary containing normalized family and recommended settings.
         """
         limiter.check("get_model_presets")
-        audit.log(
+        await audit.async_log(
             tool="get_model_presets",
             action="called",
             extra={"model_name": model_name, "model_family": model_family},
@@ -389,7 +391,7 @@ async def get_prompting_guide(model_family: str) -> dict[str, Any]:
         """
         limiter.check("get_prompting_guide")
         normalized = _normalize_model_family(model_family)
-        audit.log(
+        await audit.async_log(
             tool="get_prompting_guide",
             action="called",
             extra={"model_family": normalized},

src/comfyui_mcp/tools/files.py

@@ -103,13 +103,13 @@ async def upload_image(filename: str, image_data: str, subfolder: str = "") -> s
         clean_subfolder = sanitizer.validate_subfolder(subfolder)
         raw = base64.b64decode(image_data)
         sanitizer.validate_size(len(raw))
-        audit.log(
+        await audit.async_log(
             tool="upload_image",
             action="uploading",
             extra={"filename": clean_name, "size_bytes": len(raw)},
         )
         result = await client.upload_image(raw, clean_name, clean_subfolder)
-        audit.log(tool="upload_image", action="uploaded", extra={"result": result})
+        await audit.async_log(tool="upload_image", action="uploaded", extra={"result": result})
         return f"Uploaded {result.get('name', clean_name)} to ComfyUI input directory"
 
     tool_fns["upload_image"] = upload_image
@@ -128,7 +128,9 @@ async def get_image(filename: str, subfolder: str = "output") -> str:
         limiter.check("get_image")
         clean_name = sanitizer.validate_filename(filename)
         clean_subfolder = sanitizer.validate_subfolder(subfolder)
-        audit.log(tool="get_image", action="downloading", extra={"filename": clean_name})
+        await audit.async_log(
+            tool="get_image", action="downloading", extra={"filename": clean_name}
+        )
         data, content_type = await client.get_image(clean_name, clean_subfolder)
         b64 = base64.b64encode(data).decode()
         return f"data:{content_type};base64,{b64}"
@@ -139,7 +141,7 @@ async def get_image(filename: str, subfolder: str = "output") -> str:
     async def list_outputs() -> list[str]:
         """List files in ComfyUI's output directory."""
         limiter.check("list_outputs")
-        audit.log(tool="list_outputs", action="called")
+        await audit.async_log(tool="list_outputs", action="called")
         history = await client.get_history()
         filenames = set()
         for entry in history.values():
@@ -167,13 +169,13 @@ async def upload_mask(filename: str, mask_data: str, subfolder: str = "") -> str
         clean_subfolder = sanitizer.validate_subfolder(subfolder)
         raw = base64.b64decode(mask_data)
         sanitizer.validate_size(len(raw))
-        audit.log(
+        await audit.async_log(
             tool="upload_mask",
             action="uploading",
             extra={"filename": clean_name, "size_bytes": len(raw)},
         )
         result = await client.upload_mask(raw, clean_name, clean_subfolder)
-        audit.log(tool="upload_mask", action="uploaded", extra={"result": result})
+        await audit.async_log(tool="upload_mask", action="uploaded", extra={"result": result})
         return f"Uploaded mask {result.get('name', clean_name)} to ComfyUI input directory"
 
     tool_fns["upload_mask"] = upload_mask
@@ -197,7 +199,7 @@ async def get_workflow_from_image(filename: str, subfolder: str = "output") -> d
         limiter.check("get_workflow_from_image")
         clean_name = sanitizer.validate_filename(filename)
         clean_subfolder = sanitizer.validate_subfolder(subfolder)
-        audit.log(
+        await audit.async_log(
             tool="get_workflow_from_image",
             action="extracting",
             extra={"filename": clean_name, "subfolder": clean_subfolder},
@@ -235,7 +237,7 @@ async def get_workflow_from_image(filename: str, subfolder: str = "output") -> d
         else:
             message = "No workflow metadata found in this image"
 
-        audit.log(
+        await audit.async_log(
             tool="get_workflow_from_image",
             action="extracted",
             extra={