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GeezerVison is showing github.com — pythonnet/src/runtime/pythonengine.cs at python3 · fkarb/pythonnet Expand file tree/ Copy pathpythonengine.csMore file actions 501 lines (434 loc) · 17.1 KB / Copy pathpythonengine.csFile metadata and controls501 lines (434 loc) · 17.1 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 // ========================================================================== // This software is subject to the provisions of the Zope Public License, // Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution. // THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED // WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED // WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS // FOR A PARTICULAR PURPOSE. // ========================================================================== using System; using System.IO; using System.Threading; using System.Reflection; namespace Python.Runtime { /// <summary> /// This class provides the public interface of the Python runtime. /// </summary> public class PythonEngine { private static DelegateManager delegateManager; private static bool initialized; #region Properties public static bool IsInitialized { get { return initialized; } } internal static DelegateManager DelegateManager { get { if (delegateManager == null) { throw new InvalidOperationException("DelegateManager has not yet been initialized using Python.Runtime.PythonEngine.Initialize()."); } return delegateManager; } } public static string ProgramName { get { string result = Runtime.Py_GetProgramName(); if (result == null) { return ""; } return result; } set { Runtime.Py_SetProgramName(value); } } public static string PythonHome { get { string result = Runtime.Py_GetPythonHome(); if (result == null) { return ""; } return result; } set { Runtime.Py_SetPythonHome(value); } } public static string PythonPath { get { string result = Runtime.Py_GetPath(); if (result == null) { return ""; } return result; } set { Runtime.Py_SetPath(value); } } public static string Version { get { return Runtime.Py_GetVersion(); } } public static string BuildInfo { get { return Runtime.Py_GetBuildInfo(); } } public static string Platform { get { return Runtime.Py_GetPlatform(); } } public static string Copyright { get { return Runtime.Py_GetCopyright(); } } public static int RunSimpleString(string code) { return Runtime.PyRun_SimpleString(code); } #endregion /// <summary> /// Initialize Method /// </summary> /// /// <remarks> /// Initialize the Python runtime. It is safe to call this method /// more than once, though initialization will only happen on the /// first call. It is *not* necessary to hold the Python global /// interpreter lock (GIL) to call this method. /// </remarks> public static void Initialize() { if (!initialized) { // Creating the delegateManager MUST happen before Runtime.Initialize // is called. If it happens afterwards, DelegateManager's CodeGenerator // throws an exception in its ctor. This exception is eaten somehow // during an initial "import clr", and the world ends shortly thereafter. // This is probably masking some bad mojo happening somewhere in Runtime.Initialize(). delegateManager = new DelegateManager(); Runtime.Initialize(); initialized = true; Exceptions.Clear(); // register the atexit callback (this doesn't use Py_AtExit as the C atexit // callbacks are called after python is fully finalized but the python ones // are called while the python engine is still running). string code = "import atexit, clr\n" + "atexit.register(clr._AtExit)\n"; PyObject r = PythonEngine.RunString(code); if (r != null) r.Dispose(); // Load the clr.py resource into the clr module IntPtr clr = Python.Runtime.ImportHook.GetCLRModule(); IntPtr clr_dict = Runtime.PyModule_GetDict(clr); PyDict locals = new PyDict(); try { IntPtr module = Runtime.PyImport_AddModule("clr._extras"); IntPtr module_globals = Runtime.PyModule_GetDict(module); IntPtr builtins = Runtime.PyEval_GetBuiltins(); Runtime.PyDict_SetItemString(module_globals, "__builtins__", builtins); var assembly = Assembly.GetExecutingAssembly(); using (Stream stream = assembly.GetManifestResourceStream("clr.py")) using (StreamReader reader = new StreamReader(stream)) { // add the contents of clr.py to the module string clr_py = reader.ReadToEnd(); PyObject result = RunString(clr_py, module_globals, locals.Handle); if (null == result) throw new PythonException(); result.Dispose(); } // add the imported module to the clr module, and copy the API functions // and decorators into the main clr module. Runtime.PyDict_SetItemString(clr_dict, "_extras", module); foreach (PyObject key in locals.Keys()) { if (!key.ToString().StartsWith("_")){ PyObject value = locals[key]; Runtime.PyDict_SetItem(clr_dict, key.Handle, value.Handle); value.Dispose(); } key.Dispose(); } } finally { locals.Dispose(); } } } //==================================================================== // A helper to perform initialization from the context of an active // CPython interpreter process - this bootstraps the managed runtime // when it is imported by the CLR extension module. //==================================================================== #if (PYTHON32 || PYTHON33 || PYTHON34) public static IntPtr InitExt() { #else public static void InitExt() { #endif try { Initialize(); // Trickery - when the import hook is installed into an already // running Python, the standard import machinery is still in // control for the duration of the import that caused bootstrap. // // That is problematic because the std machinery tries to get // sub-names directly from the module __dict__ rather than going // through our module object's getattr hook. This workaround is // evil ;) We essentially climb up the stack looking for the // import that caused the bootstrap to happen, then re-execute // the import explicitly after our hook has been installed. By // doing this, the original outer import should work correctly. // // Note that this is only needed during the execution of the // first import that installs the CLR import hook. This hack // still doesn't work if you use the interactive interpreter, // since there is no line info to get the import line ;( string code = "import traceback\n" + "for item in traceback.extract_stack():\n" + " line = item[3]\n" + " if line is not None:\n" + " if line.startswith('import CLR') or \\\n" + " line.startswith('import clr') or \\\n" + " line.startswith('from clr') or \\\n" + " line.startswith('from CLR'):\n" + " exec(line)\n" + " break\n"; PyObject r = PythonEngine.RunString(code); if (r != null) { r.Dispose(); } } catch (PythonException e) { e.Restore(); #if (PYTHON32 || PYTHON33 || PYTHON34) return IntPtr.Zero; #endif } #if (PYTHON32 || PYTHON33 || PYTHON34) return Python.Runtime.ImportHook.GetCLRModule(); #endif } /// <summary> /// Shutdown Method /// </summary> /// /// <remarks> /// Shutdown and release resources held by the Python runtime. The /// Python runtime can no longer be used in the current process /// after calling the Shutdown method. /// </remarks> public static void Shutdown() { if (initialized) { Runtime.Shutdown(); initialized = false; } } /// <summary> /// AcquireLock Method /// </summary> /// /// <remarks> /// Acquire the Python global interpreter lock (GIL). Managed code /// *must* call this method before using any objects or calling any /// methods on objects in the Python.Runtime namespace. The only /// exception is PythonEngine.Initialize, which may be called without /// first calling AcquireLock. /// /// Each call to AcquireLock must be matched by a corresponding call /// to ReleaseLock, passing the token obtained from AcquireLock. /// /// For more information, see the "Extending and Embedding" section /// of the Python documentation on www.python.org. /// </remarks> public static IntPtr AcquireLock() { return Runtime.PyGILState_Ensure(); } /// <summary> /// ReleaseLock Method /// </summary> /// /// <remarks> /// Release the Python global interpreter lock using a token obtained /// from a previous call to AcquireLock. /// /// For more information, see the "Extending and Embedding" section /// of the Python documentation on www.python.org. /// </remarks> public static void ReleaseLock(IntPtr gs) { Runtime.PyGILState_Release(gs); } /// <summary> /// BeginAllowThreads Method /// </summary> /// /// <remarks> /// Release the Python global interpreter lock to allow other threads /// to run. This is equivalent to the Py_BEGIN_ALLOW_THREADS macro /// provided by the C Python API. /// /// For more information, see the "Extending and Embedding" section /// of the Python documentation on www.python.org. /// </remarks> public static IntPtr BeginAllowThreads() { return Runtime.PyEval_SaveThread(); } /// <summary> /// EndAllowThreads Method /// </summary> /// /// <remarks> /// Re-aquire the Python global interpreter lock for the current /// thread. This is equivalent to the Py_END_ALLOW_THREADS macro /// provided by the C Python API. /// /// For more information, see the "Extending and Embedding" section /// of the Python documentation on www.python.org. /// </remarks> public static void EndAllowThreads(IntPtr ts) { Runtime.PyEval_RestoreThread(ts); } /// <summary> /// ImportModule Method /// </summary> /// /// <remarks> /// Given a fully-qualified module or package name, import the /// module and return the resulting module object as a PyObject /// or null if an exception is raised. /// </remarks> public static PyObject ImportModule(string name) { IntPtr op = Runtime.PyImport_ImportModule(name); if (op == IntPtr.Zero) { return null; } return new PyObject(op); } /// <summary> /// ReloadModule Method /// </summary> /// /// <remarks> /// Given a PyObject representing a previously loaded module, reload /// the module. /// </remarks> public static PyObject ReloadModule(PyObject module) { IntPtr op = Runtime.PyImport_ReloadModule(module.Handle); if (op == IntPtr.Zero) { throw new PythonException(); } return new PyObject(op); } /// <summary> /// ModuleFromString Method /// </summary> /// /// <remarks> /// Given a string module name and a string containing Python code, /// execute the code in and return a module of the given name. /// </remarks> public static PyObject ModuleFromString(string name, string code) { IntPtr c = Runtime.Py_CompileString(code, "none", (IntPtr)257); if (c == IntPtr.Zero) { throw new PythonException(); } IntPtr m = Runtime.PyImport_ExecCodeModule(name, c); if (m == IntPtr.Zero) { throw new PythonException(); } return new PyObject(m); } /// <summary> /// RunString Method /// </summary> /// /// <remarks> /// Run a string containing Python code. Returns the result of /// executing the code string as a PyObject instance, or null if /// an exception was raised. /// </remarks> public static PyObject RunString(string code) { IntPtr globals = Runtime.PyEval_GetGlobals(); IntPtr locals = Runtime.PyDict_New(); IntPtr builtins = Runtime.PyEval_GetBuiltins(); Runtime.PyDict_SetItemString(locals, "__builtins__", builtins); IntPtr flag = (IntPtr)257; /* Py_file_input */ IntPtr result = Runtime.PyRun_String(code, flag, globals, locals); Runtime.Decref(locals); if (result == IntPtr.Zero) { return null; } return new PyObject(result); } public static PyObject RunString(string code, IntPtr globals, IntPtr locals) { IntPtr flag = (IntPtr)257; /* Py_file_input */ IntPtr result = Runtime.PyRun_String(code, flag, globals, locals); if (result == IntPtr.Zero) { return null; } return new PyObject(result); } } public static class Py { public static GILState GIL() { if (!PythonEngine.IsInitialized) PythonEngine.Initialize(); return new GILState(); } public class GILState : IDisposable { private IntPtr state; internal GILState() { state = PythonEngine.AcquireLock(); } public void Dispose() { PythonEngine.ReleaseLock(state); GC.SuppressFinalize(this); } ~GILState() { Dispose(); } } public class KeywordArguments : PyDict { } public static KeywordArguments kw(params object[] kv) { var dict = new KeywordArguments(); if (kv.Length % 2 != 0) throw new ArgumentException("Must have an equal number of keys and values"); for (int i = 0; i < kv.Length; i += 2) { IntPtr value; if (kv[i + 1] is PyObject) value = ((PyObject)kv[i + 1]).Handle; else value = Converter.ToPython(kv[i + 1], kv[i + 1].GetType()); if (Runtime.PyDict_SetItemString(dict.Handle, (string)kv[i], value) != 0) throw new ArgumentException(string.Format("Cannot add key '{0}' to dictionary.", (string)kv[i])); if (!(kv[i + 1] is PyObject)) Runtime.Decref(value); } return dict; } public static PyObject Import(string name) { return PythonEngine.ImportModule(name); } } } |
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