linux: add start script and fixes; diagnostic outputs

app/core/refrigerant_loader.py

@@ -7,21 +7,82 @@ import os
 from pathlib import Path
 from typing import Dict, Optional, List
 
-# Prefer the packaged app.ipm module, but keep a fallback to the legacy
-# IPM_DLL folder for development compatibility.
-try:
-    from app.ipm.simple_refrig_api import Refifc, MockRefifc  # type: ignore
-except Exception:
-    # Fall back to loading from IPM_DLL directory as before. Import the
-    # module and pick attributes if present; older legacy wrappers may not
-    # define MockRefifc.
-    _current_dir = Path(__file__).parent.parent.parent
-    _ipm_dll_dir = _current_dir / "IPM_DLL"
-    if str(_ipm_dll_dir) not in sys.path:
-        sys.path.insert(0, str(_ipm_dll_dir))
-    import simple_refrig_api as _sr  # type: ignore
-    Refifc = getattr(_sr, 'Refifc')
-    MockRefifc = getattr(_sr, 'MockRefifc', None)
+# If IPM_DISABLE_NATIVE=1 is set, use a lightweight MockRefifc to avoid
+# loading the native shared libraries during tests or environments where
+# the native binaries are not available. This is a fast, deterministic
+# fallback and prevents expensive or failing native loads at import time.
+_USE_MOCK = os.environ.get("IPM_DISABLE_NATIVE", "0") in ("1", "true", "True")
+
+class MockRefifc:
+    """Minimal mock of the Refifc interface used for fast tests.
+
+    It implements only the methods the app commonly calls (p_begin, p_end,
+    hsl_px, hsv_px, T_px, h_pT, h_px, p_Tx) with simple deterministic
+    formulas so tests and diagram generation can run without native libs.
+    """
+    def __init__(self, refrig_name: str):
+        self.refrig_name = refrig_name
+
+    def p_begin(self):
+        return 1e4  # Pa
+
+    def p_end(self):
+        return 4e6  # Pa
+
+    def hsl_px(self, p, x):
+        # return a plausible enthalpy (J/kg)
+        return 1e5 + 0.1 * p
+
+    def hsv_px(self, p, x):
+        return 2e5 + 0.1 * p
+
+    def T_px(self, p, x):
+        # return Kelvin
+        return 273.15 + 20.0 + (p / 1e5) * 5.0
+
+    def h_pT(self, p, T):
+        return 1.5e5 + (T - 273.15) * 1000.0
+
+    def h_px(self, p, x):
+        return self.hsl_px(p, x) if x == 0 else self.hsv_px(p, x)
+
+    def p_Tx(self, T, x):
+        # inverse of T_px approximately
+        return ( (T - 273.15 - 20.0) / 5.0 ) * 1e5
+
+
+if _USE_MOCK:
+    # Use the lightweight mock implementation defined above
+    Refifc = MockRefifc
+else:
+    # Prefer the packaged app.ipm module. For very old/legacy setups that still
+    # ship a top-level `simple_refrig_api.py` in an `IPM_DLL` folder we keep a
+    # fallback, but only if that file actually exists. This avoids attempting a
+    # top-level import when the module is provided as `app.ipm.simple_refrig_api`.
+    try:
+        # Import the package module and read attributes to allow the wrapper to
+        # work even when `MockRefifc` is not defined in the implementation.
+        import importlib
+        _sr_pkg = importlib.import_module('app.ipm.simple_refrig_api')
+        Refifc = getattr(_sr_pkg, 'Refifc')
+        MockRefifc = getattr(_sr_pkg, 'MockRefifc', None)
+    except Exception as _first_exc:
+        # If a legacy IPM_DLL/simple_refrig_api.py file exists, import it as a
+        # top-level module; otherwise re-raise the original exception.
+        _current_dir = Path(__file__).parent.parent.parent
+        _ipm_dll_dir = _current_dir / "IPM_DLL"
+        legacy_module_file = _ipm_dll_dir / "simple_refrig_api.py"
+
+        if legacy_module_file.exists():
+            if str(_ipm_dll_dir) not in sys.path:
+                sys.path.insert(0, str(_ipm_dll_dir))
+            import simple_refrig_api as _sr  # type: ignore
+            Refifc = getattr(_sr, 'Refifc')
+            MockRefifc = getattr(_sr, 'MockRefifc', None)
+        else:
+            # No legacy file found; re-raise the original import error so the
+            # caller sees the underlying cause (missing dependency, etc.).
+            raise _first_exc
 
 
 class RefrigerantLibrary:
@@ -134,16 +195,23 @@ class RefrigerantManager:
             Liste de dictionnaires avec nom et disponibilite
         """
         available = []
-        
+
+        # Instead of attempting to load every refrigerant (which triggers
+        # potentially expensive native library loads), prefer a fast check by
+        # detecting whether the corresponding shared object exists in the
+        # repository's ipm lib/so directory. Loading is left for explicit
+        # requests (POST /{refrig}/load) or when a refrigerant is already
+        # present in memory.
+        repo_app_dir = Path(__file__).parent.parent
+        libs_dir = repo_app_dir / 'ipm' / 'lib' / 'so'
+
         for refrig in self.SUPPORTED_REFRIGERANTS:
             try:
-                # Tenter de charger pour verifier disponibilite
-                if refrig not in self._loaded_refrigerants:
-                    self.load_refrigerant(refrig)
-                
+                lib_file = libs_dir / f"lib{refrig}.so"
+                exists = lib_file.exists()
                 available.append({
                     "name": refrig,
-                    "available": True,
+                    "available": bool(exists or (refrig in self._loaded_refrigerants)),
                     "loaded": refrig in self._loaded_refrigerants
                 })
             except Exception as e:
@@ -152,7 +220,7 @@ class RefrigerantManager:
                     "available": False,
                     "error": str(e)
                 })
-        
+
         return available
     
     def load_refrigerant(self, refrig_name: str) -> RefrigerantLibrary: