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lostmsulostmsu
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Remove deprecated implicit assembly loading
Legacy behavior: `import Company.Product.Namespace` would search for `Company.Product.Namespace.dll` .NET assmebly, load it, and import the namespace. New behavior: User must always explicitly add assembly reference using `clr.AddReference` to `Company.Product.Namespace` prior to attempting import
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‎CHANGELOG.md‎

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@@ -33,6 +33,10 @@ details about the cause of the failure
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- Fixed a bug where indexers could not be used if they were inherited
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- Made it possible to use `__len__` also on `ICollection<>` interface objects
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### Removed
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- implicit assembly loading (you have to explicitly `clr.AddReference` before doing import)
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## [2.5.0][] - 2020-06-14
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This version improves performance on benchmarks significantly compared to 2.3.

‎src/runtime/assemblymanager.cs‎

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@@ -252,75 +252,6 @@ public static Assembly FindLoadedAssembly(string name)
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return null;
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}
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/// <summary>
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/// Given a qualified name of the form A.B.C.D, attempt to load
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/// an assembly named after each of A.B.C.D, A.B.C, A.B, A. This
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/// will only actually probe for the assembly once for each unique
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/// namespace. Returns true if any assemblies were loaded.
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/// </summary>
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/// <remarks>
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/// TODO item 3 "* Deprecate implicit loading of assemblies":
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/// Set the fromFile flag if the name of the loaded assembly matches
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/// the fully qualified name that was requested if the framework
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/// actually loads an assembly.
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/// Call ONLY for namespaces that HAVE NOT been cached yet.
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/// </remarks>
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public static bool LoadImplicit(string name, Action<Exception> assemblyLoadErrorHandler, bool warn = true)
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{
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string[] names = name.Split('.');
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var loaded = false;
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var s = "";
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Assembly lastAssembly = null;
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HashSet<Assembly> assembliesSet = null;
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for (var i = 0; i < names.Length; i++)
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{
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s = i == 0 ? names[0] : s + "." + names[i];
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if (!probed.ContainsKey(s))
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{
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if (assembliesSet == null)
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{
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assembliesSet = new HashSet<Assembly>(AppDomain.CurrentDomain.GetAssemblies());
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}
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Assembly a = FindLoadedAssembly(s);
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try
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{
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if (a == null)
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{
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a = LoadAssemblyPath(s);
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}
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if (a == null)
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{
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a = LoadAssembly(s);
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}
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}
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catch (FileLoadException e) { assemblyLoadErrorHandler(e); }
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catch (BadImageFormatException e) { assemblyLoadErrorHandler(e); }
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catch (System.Security.SecurityException e) { assemblyLoadErrorHandler(e); }
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catch (PathTooLongException e) { assemblyLoadErrorHandler(e); }
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if (a != null && !assembliesSet.Contains(a))
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{
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loaded = true;
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lastAssembly = a;
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}
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probed[s] = 1;
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}
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}
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// Deprecation warning
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if (warn && loaded)
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{
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string location = Path.GetFileNameWithoutExtension(lastAssembly.Location);
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string deprWarning = "The module was found, but not in a referenced namespace.\n" +
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$"Implicit loading is deprecated. Please use clr.AddReference('{location}').";
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Exceptions.deprecation(deprWarning);
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}
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return loaded;
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}
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/// <summary>
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/// Scans an assembly for exported namespaces, adding them to the
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/// mapping of valid namespaces. Note that for a given namespace

‎src/runtime/importhook.cs‎

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@@ -310,38 +310,6 @@ public static IntPtr __import__(IntPtr self, IntPtr args, IntPtr kw)
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string[] names = realname.Split('.');
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// Now we need to decide if the name refers to a CLR module,
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// and may have to do an implicit load (for b/w compatibility)
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// using the AssemblyManager. The assembly manager tries
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// really hard not to use Python objects or APIs, because
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// parts of it can run recursively and on strange threads.
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//
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// It does need an opportunity from time to time to check to
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// see if sys.path has changed, in a context that is safe. Here
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// we know we have the GIL, so we'll let it update if needed.
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AssemblyManager.UpdatePath();
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if (!AssemblyManager.IsValidNamespace(realname))
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{
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var loadExceptions = new List<Exception>();
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if (!AssemblyManager.LoadImplicit(realname, assemblyLoadErrorHandler: loadExceptions.Add))
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{
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// May be called when a module being imported imports a module.
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// In particular, I've seen decimal import copy import org.python.core
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IntPtr importResult = Runtime.PyObject_Call(py_import, args, kw);
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// TODO: use ModuleNotFoundError in Python 3.6+
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if (importResult == IntPtr.Zero && loadExceptions.Count > 0
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&& Exceptions.ExceptionMatches(Exceptions.ImportError))
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{
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loadExceptions.Add(new PythonException());
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var importError = new PyObject(new BorrowedReference(Exceptions.ImportError));
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importError.SetAttr("__cause__", new AggregateException(loadExceptions).ToPython());
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Runtime.PyErr_SetObject(new BorrowedReference(Exceptions.ImportError), importError.Reference);
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}
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return importResult;
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}
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}
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// See if sys.modules for this interpreter already has the
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// requested module. If so, just return the existing module.
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IntPtr modules = Runtime.PyImport_GetModuleDict();

‎src/runtime/moduleobject.cs‎

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@@ -118,30 +118,6 @@ public ManagedType GetAttribute(string name, bool guess)
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return c;
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}
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// This is a little repetitive, but it ensures that the right
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// thing happens with implicit assembly loading at a reasonable
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// cost. Ask the AssemblyManager to do implicit loading for each
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// of the steps in the qualified name, then try it again.
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bool ignore = name.StartsWith("__");
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if (AssemblyManager.LoadImplicit(qname, assemblyLoadErrorHandler: ImportWarning, !ignore))
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{
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if (AssemblyManager.IsValidNamespace(qname))
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{
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m = new ModuleObject(qname);
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StoreAttribute(name, m);
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m.DecrRefCount();
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return m;
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}
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type = AssemblyManager.LookupTypes(qname).FirstOrDefault(t => t.IsPublic);
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if (type != null)
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{
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c = ClassManager.GetClass(type);
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StoreAttribute(name, c);
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return c;
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}
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}
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// We didn't find the name, so we may need to see if there is a
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// generic type with this base name. If so, we'll go ahead and
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// return it. Note that we store the mapping of the unmangled

‎src/tests/test_array.py‎

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@@ -2,6 +2,7 @@
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"""Test support for managed arrays."""
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import clr
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import Python.Test as Test
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import System
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import pytest
@@ -1143,6 +1144,8 @@ def test_boxed_value_type_mutation_result():
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# to accidentally write code like the following which is not really
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# mutating value types in-place but changing boxed copies.
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clr.AddReference('System.Drawing')
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from System.Drawing import Point
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from System import Array
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‎src/tests/test_class.py‎

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"""Test CLR class support."""
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import clr
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import Python.Test as Test
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import System
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import pytest
@@ -124,6 +125,9 @@ def __init__(self, v):
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def test_struct_construction():
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"""Test construction of structs."""
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clr.AddReference('System.Drawing')
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from System.Drawing import Point
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p = Point()

‎src/tests/test_compat.py‎

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"""Backward-compatibility tests for deprecated features."""
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import clr
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import types
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import pytest
@@ -137,6 +138,8 @@ def test_dotted_name_import_from_with_alias():
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def test_from_module_import_star():
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"""Test from module import * behavior."""
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clr.AddReference('System.Management')
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count = len(locals().keys())
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m = __import__('CLR.System.Management', globals(), locals(), ['*'])
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assert m.__name__ == 'System.Management'

‎src/tests/test_module.py‎

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@@ -192,6 +192,8 @@ def test_dotted_name_import_from_with_alias():
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def test_from_module_import_star():
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"""Test from module import * behavior."""
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clr.AddReference('System.Xml')
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count = len(locals().keys())
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m = __import__('System.Xml', globals(), locals(), ['*'])
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assert m.__name__ == 'System.Xml'
@@ -201,16 +203,14 @@ def test_from_module_import_star():
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def test_implicit_assembly_load():
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"""Test implicit assembly loading via import."""
204-
with warnings.catch_warnings(record=True) as w:
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warnings.simplefilter("always")
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with pytest.raises(ImportError):
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# MS.Build should not have been added as a reference yet
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# (and should exist for mono)
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# should trigger a DeprecationWarning as Microsoft.Build hasn't
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# been added as a reference yet (and should exist for mono)
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# The implicit behavior has been disabled in 3.0
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# therefore this should fail
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import Microsoft.Build
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assert len(w) == 1
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assert isinstance(w[0].message, DeprecationWarning)
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with warnings.catch_warnings(record=True) as w:
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clr.AddReference("System.Windows.Forms")
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import System.Windows.Forms as Forms

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