Fix Engine WebUI staging and logging outputs

Borealis.ps1

@@ -198,7 +198,7 @@ function Ensure-EngineWebInterface {
         [string]$ProjectRoot
     )
 
-    $engineSource = Join-Path $ProjectRoot 'Data\Engine\web-interface'
+    $engineSource = Join-Path $ProjectRoot 'Engine\web-interface'
     $legacySource = Join-Path $ProjectRoot 'Data\Server\WebUI'
 
     if (-not (Test-Path $legacySource)) {
@@ -1108,7 +1108,7 @@ switch ($choice) {
         $venvFolder       = "Server"
         $dataSource       = "Data"
         $dataDestination  = "$venvFolder\Borealis"
-        $customUIPath     = "$dataSource\Engine\web-interface"
+        $customUIPath     = (Join-Path $scriptDir 'Engine\web-interface')
         $webUIDestination = "$venvFolder\web-interface"
         $venvPython       = Join-Path $venvFolder 'Scripts\python.exe'
 
@@ -1408,7 +1408,7 @@ switch ($choice) {
 
         Run-Step "Copy Borealis Engine WebUI Files into: $webUIDestination" {
             Ensure-EngineWebInterface -ProjectRoot $scriptDir
-            $engineWebUISource = Join-Path $engineSourceAbsolute 'web-interface'
+            $engineWebUISource = Join-Path $scriptDir 'Engine\web-interface'
             if (Test-Path $engineWebUISource) {
                 $webUIDestinationAbsolute = Join-Path $scriptDir $webUIDestination
                 if (Test-Path $webUIDestinationAbsolute) {

Borealis.sh

@@ -331,7 +331,7 @@ PY
 }
 
 ensure_engine_webui_source() {
-  local engineSource="Data/Engine/web-interface"
+  local engineSource="Engine/web-interface"
   local legacySource="Data/Server/WebUI"
   if [[ -d "${engineSource}/src" && -f "${engineSource}/package.json" ]]; then
     return 0
@@ -351,7 +351,7 @@ ensure_engine_webui_source() {
 }
 
 prepare_webui() {
-  local customUIPath="Data/Engine/web-interface"
+  local customUIPath="Engine/web-interface"
   local webUIDestination="Server/web-interface"
   ensure_engine_webui_source || return 1
   mkdir -p "$webUIDestination"

Data/Engine/Unit_Tests/conftest.py

@@ -112,8 +112,10 @@ def engine_harness(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Iterator[
     key_path.write_text("test-key", encoding="utf-8")
     bundle_path.write_text(bundle_contents, encoding="utf-8")
 
-    log_path = tmp_path / "logs" / "server.log"
+    logs_dir = tmp_path / "logs"
-    log_path.parent.mkdir(parents=True, exist_ok=True)
+    logs_dir.mkdir(parents=True, exist_ok=True)
+    log_path = logs_dir / "server.log"
+    error_log_path = logs_dir / "error.log"
 
     config = {
         "DATABASE_PATH": str(db_path),
@@ -121,6 +123,7 @@ def engine_harness(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Iterator[
         "TLS_KEY_PATH": str(key_path),
         "TLS_BUNDLE_PATH": str(bundle_path),
         "LOG_FILE": str(log_path),
+        "ERROR_LOG_FILE": str(error_log_path),
         "API_GROUPS": ("tokens", "enrollment"),
     }
 

Data/Engine/config.py

@@ -26,8 +26,9 @@ defaults that mirror the legacy server runtime.  Key environment variables are
 
 When TLS values are not provided explicitly the Engine falls back to the
 certificate helper shipped with the legacy server, ensuring bundling parity.
-Logs are written to ``Logs/Server/server.log`` with daily rotation so the new
+Logs are written to ``Logs/Engine/engine.log`` with daily rotation and
-runtime integrates with existing operational practices.
+errors are additionally duplicated to ``Logs/Engine/error.log`` so the
+runtime integrates with the platform's logging policy.
 """
 
 from __future__ import annotations
@@ -48,7 +49,9 @@ except Exception:  # pragma: no-cover - Engine configuration still works without
 ENGINE_DIR = Path(__file__).resolve().parent
 PROJECT_ROOT = ENGINE_DIR.parent.parent
 DEFAULT_DATABASE_PATH = PROJECT_ROOT / "database.db"
-LOG_FILE_PATH = PROJECT_ROOT / "Logs" / "Server" / "server.log"
+LOG_ROOT = PROJECT_ROOT / "Logs" / "Engine"
+LOG_FILE_PATH = LOG_ROOT / "engine.log"
+ERROR_LOG_FILE_PATH = LOG_ROOT / "error.log"
 
 
 def _ensure_parent(path: Path) -> None:
@@ -61,16 +64,27 @@ def _ensure_parent(path: Path) -> None:
 
 
 def _resolve_static_folder() -> str:
-    candidates = [
+    candidate_roots = [
-        ENGINE_DIR / "web-interface" / "build",
+        ENGINE_DIR.parent / "Engine" / "web-interface",
-        ENGINE_DIR / "web-interface" / "dist",
         ENGINE_DIR / "web-interface",
     ]
+
+    candidates = []
+    for root in candidate_roots:
+        absolute_root = root.resolve()
+        candidates.extend(
+            [
+                absolute_root / "build",
+                absolute_root / "dist",
+                absolute_root,
+            ]
+        )
+
     for candidate in candidates:
-        absolute = candidate.resolve()
+        if candidate.is_dir():
-        if absolute.is_dir():
+            return str(candidate)
-            return str(absolute)
+
-    return str(candidates[0].resolve())
+    return str(candidates[0])
 
 
 def _parse_origins(raw: Optional[Any]) -> Optional[List[str]]:
@@ -139,6 +153,7 @@ class EngineSettings:
     tls_key_path: Optional[str]
     tls_bundle_path: Optional[str]
     log_file: str
+    error_log_file: str
     api_groups: Tuple[str, ...]
     raw: MutableMapping[str, Any] = field(default_factory=dict)
 
@@ -219,6 +234,9 @@ def load_runtime_config(overrides: Optional[Mapping[str, Any]] = None) -> Engine
     log_file = str(runtime_config.get("LOG_FILE") or LOG_FILE_PATH)
     _ensure_parent(Path(log_file))
 
+    error_log_file = str(runtime_config.get("ERROR_LOG_FILE") or ERROR_LOG_FILE_PATH)
+    _ensure_parent(Path(error_log_file))
+
     api_groups = _parse_api_groups(
         runtime_config.get("API_GROUPS") or os.environ.get("BOREALIS_API_GROUPS")
     )
@@ -237,6 +255,7 @@ def load_runtime_config(overrides: Optional[Mapping[str, Any]] = None) -> Engine
         tls_key_path=tls_key_path if tls_key_path else None,
         tls_bundle_path=tls_bundle_path if tls_bundle_path else None,
         log_file=str(log_file),
+        error_log_file=str(error_log_file),
         api_groups=api_groups,
         raw=runtime_config,
     )
@@ -244,7 +263,7 @@ def load_runtime_config(overrides: Optional[Mapping[str, Any]] = None) -> Engine
 
 
 def initialise_engine_logger(settings: EngineSettings, name: str = "borealis.engine") -> logging.Logger:
-    """Configure the Engine logger to write to the shared server log."""
+    """Configure the Engine logger to write to Engine log files."""
 
     logger = logging.getLogger(name)
     if not logger.handlers:
@@ -263,6 +282,16 @@ def initialise_engine_logger(settings: EngineSettings, name: str = "borealis.eng
         file_handler.setFormatter(formatter)
         logger.addHandler(file_handler)
 
+        error_handler = TimedRotatingFileHandler(
+            settings.error_log_file,
+            when="midnight",
+            backupCount=0,
+            encoding="utf-8",
+        )
+        error_handler.setLevel(logging.ERROR)
+        error_handler.setFormatter(formatter)
+        logger.addHandler(error_handler)
+
     logger.setLevel(logging.INFO)
     logger.propagate = False
     return logger

Data/Engine/server.py

@@ -4,8 +4,8 @@ Stage 1 introduced the structural skeleton for the Engine runtime.  Stage 2
 builds upon that foundation by centralising configuration handling and logging
 initialisation so the Engine mirrors the legacy server's start-up behaviour.
 The factory delegates configuration resolution to :mod:`Data.Engine.config`
-and emits structured logs to ``Logs/Server/server.log`` to align with the
+and emits structured logs to ``Logs/Engine/engine.log`` (with an accompanying
-project's operational practices.
+error log) to align with the project's operational practices.
 """
 from __future__ import annotations
 
@@ -16,17 +16,22 @@ from dataclasses import dataclass
 from pathlib import Path
 from typing import Any, Mapping, Optional, Sequence, Tuple
 
-import eventlet
+try:  # pragma: no-cover - optional dependency when running without eventlet
+    import eventlet  # type: ignore
+except Exception:  # pragma: no-cover - fall back to threading mode
+    eventlet = None  # type: ignore[assignment]
+    logging.getLogger(__name__).warning(
+        "Eventlet is not available; Engine will run Socket.IO in threading mode."
+    )
+else:  # pragma: no-cover - monkey patch only when eventlet is present
+    eventlet.monkey_patch(thread=False)
+
 from flask import Flask, request
 from flask_cors import CORS
 from flask_socketio import SocketIO
 from werkzeug.middleware.proxy_fix import ProxyFix
 
-# Eventlet ensures Socket.IO long-polling and WebSocket support parity with the
+if eventlet:
-# legacy server. We keep thread pools enabled for compatibility with blocking
-# filesystem/database operations.
-eventlet.monkey_patch(thread=False)
-
     try:  # pragma: no-cover - defensive import mirroring the legacy runtime.
         from eventlet.wsgi import HttpProtocol  # type: ignore
     except Exception:  # pragma: no-cover - the Engine should still operate without it.
@@ -73,6 +78,10 @@ else:
                 return None
 
         HttpProtocol.handle_one_request = _quiet_tls_http_mismatch  # type: ignore[assignment]
+else:
+    HttpProtocol = None  # type: ignore[assignment]
+
+_SOCKETIO_ASYNC_MODE = "eventlet" if eventlet else "threading"
 
 
 # Ensure the legacy ``Modules`` package is importable when running from the
@@ -171,7 +180,7 @@ def create_app(config: Optional[Mapping[str, Any]] = None) -> Tuple[Flask, Socke
     socketio = SocketIO(
         app,
         cors_allowed_origins="*",
-        async_mode="eventlet",
+        async_mode=_SOCKETIO_ASYNC_MODE,
         engineio_options={
             "max_http_buffer_size": 100_000_000,
             "max_websocket_message_size": 100_000_000,