This repository was archived by the owner on Jul 22, 2023. It is now read-only.
forked from pythonnet/pythonnet
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathpythonengine.cs
More file actions
785 lines (693 loc) · 26.1 KB
/
pythonengine.cs
File metadata and controls
785 lines (693 loc) · 26.1 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
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
namespace Python.Runtime
{
/// <summary>
/// This class provides the public interface of the Python runtime.
/// </summary>
public class PythonEngine : IDisposable
{
private static DelegateManager delegateManager;
private static bool initialized;
private static IntPtr _pythonHome = IntPtr.Zero;
private static IntPtr _programName = IntPtr.Zero;
private static IntPtr _pythonPath = IntPtr.Zero;
public PythonEngine()
{
Initialize();
}
public PythonEngine(params string[] args)
{
Initialize(args);
}
public PythonEngine(IEnumerable<string> args)
{
Initialize(args);
}
public void Dispose()
{
Shutdown();
}
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
{
IntPtr p = Runtime.Py_GetProgramName();
return UcsMarshaler.PtrToPy3UnicodePy2String(p) ?? "";
}
set
{
Marshal.FreeHGlobal(_programName);
_programName = UcsMarshaler.Py3UnicodePy2StringtoPtr(value);
Runtime.Py_SetProgramName(_programName);
}
}
public static string PythonHome
{
get
{
IntPtr p = Runtime.Py_GetPythonHome();
return UcsMarshaler.PtrToPy3UnicodePy2String(p) ?? "";
}
set
{
// this value is null in the beginning
Marshal.FreeHGlobal(_pythonHome);
_pythonHome = UcsMarshaler.Py3UnicodePy2StringtoPtr(value);
Runtime.Py_SetPythonHome(_pythonHome);
}
}
public static string PythonPath
{
get
{
IntPtr p = Runtime.Py_GetPath();
return UcsMarshaler.PtrToPy3UnicodePy2String(p) ?? "";
}
set
{
if (Runtime.IsPython2)
{
throw new NotSupportedException("Set PythonPath not supported on Python 2");
}
Marshal.FreeHGlobal(_pythonPath);
_pythonPath = UcsMarshaler.Py3UnicodePy2StringtoPtr(value);
Runtime.Py_SetPath(_pythonPath);
}
}
public static string Version
{
get { return Marshal.PtrToStringAnsi(Runtime.Py_GetVersion()); }
}
public static string BuildInfo
{
get { return Marshal.PtrToStringAnsi(Runtime.Py_GetBuildInfo()); }
}
public static string Platform
{
get { return Marshal.PtrToStringAnsi(Runtime.Py_GetPlatform()); }
}
public static string Copyright
{
get { return Marshal.PtrToStringAnsi(Runtime.Py_GetCopyright()); }
}
public static string Compiler
{
get { return Marshal.PtrToStringAnsi(Runtime.Py_GetCompiler()); }
}
/// <summary>
/// Set the NoSiteFlag to disable loading the site module.
/// Must be called before Initialize.
/// https://docs.python.org/3/c-api/init.html#c.Py_NoSiteFlag
/// </summary>
public static void SetNoSiteFlag()
{
Runtime.SetNoSiteFlag();
}
public static int RunSimpleString(string code)
{
return Runtime.PyRun_SimpleString(code);
}
public static void Initialize()
{
Initialize(setSysArgv: true);
}
public static void Initialize(bool setSysArgv = true, bool initSigs = false)
{
Initialize(Enumerable.Empty<string>(), setSysArgv: setSysArgv, initSigs: initSigs);
}
/// <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.
/// initSigs can be set to 1 to do default python signal configuration. This will override the way signals are handled by the application.
/// </remarks>
public static void Initialize(IEnumerable<string> args, bool setSysArgv = true, bool initSigs = false)
{
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(initSigs);
initialized = true;
Exceptions.Clear();
// Make sure we clean up properly on app domain unload.
AppDomain.CurrentDomain.DomainUnload += OnDomainUnload;
// Remember to shut down the runtime.
AddShutdownHandler(Runtime.Shutdown);
// The global scope gets used implicitly quite early on, remember
// to clear it out when we shut down.
AddShutdownHandler(PyScopeManager.Global.Clear);
if (setSysArgv)
{
Py.SetArgv(args);
}
// 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";
PythonEngine.Exec(code);
// Load the clr.py resource into the clr module
IntPtr clr = Python.Runtime.ImportHook.GetCLRModule();
IntPtr clr_dict = Runtime.PyModule_GetDict(clr);
var 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);
Assembly assembly = Assembly.GetExecutingAssembly();
using (Stream stream = assembly.GetManifestResourceStream("clr.py"))
using (var reader = new StreamReader(stream))
{
// add the contents of clr.py to the module
string clr_py = reader.ReadToEnd();
Exec(clr_py, module_globals, locals.Handle);
}
// 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("_") || key.ToString().Equals("__version__"))
{
PyObject value = locals[key];
Runtime.PyDict_SetItem(clr_dict, key.Handle, value.Handle);
value.Dispose();
}
key.Dispose();
}
}
finally
{
locals.Dispose();
}
}
}
static void OnDomainUnload(object _, EventArgs __)
{
Shutdown();
}
/// <summary>
/// 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.
/// </summary>
#if PYTHON3
public static IntPtr InitExt()
#elif PYTHON2
public static void InitExt()
#endif
{
try
{
Initialize(setSysArgv: false);
// 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";
PythonEngine.Exec(code);
}
catch (PythonException e)
{
e.Restore();
#if PYTHON3
return IntPtr.Zero;
#endif
}
#if PYTHON3
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)
{
PyScopeManager.Global.Clear();
// If the shutdown handlers trigger a domain unload,
// don't call shutdown again.
AppDomain.CurrentDomain.DomainUnload -= OnDomainUnload;
ExecuteShutdownHandlers();
PyObjectConversions.Reset();
initialized = false;
}
}
/// <summary>
/// Called when the engine is shut down.
///
/// Shutdown handlers are run in reverse order they were added, so that
/// resources available when running a shutdown handler are the same as
/// what was available when it was added.
/// </summary>
public delegate void ShutdownHandler();
static List<ShutdownHandler> ShutdownHandlers = new List<ShutdownHandler>();
/// <summary>
/// Add a function to be called when the engine is shut down.
///
/// Shutdown handlers are executed in the opposite order they were
/// added, so that you can be sure that everything that was initialized
/// when you added the handler is still initialized when you need to shut
/// down.
///
/// If the same shutdown handler is added several times, it will be run
/// several times.
///
/// Don't add shutdown handlers while running a shutdown handler.
/// </summary>
public static void AddShutdownHandler(ShutdownHandler handler)
{
ShutdownHandlers.Add(handler);
}
/// <summary>
/// Remove a shutdown handler.
///
/// If the same shutdown handler is added several times, only the last
/// one is removed.
///
/// Don't remove shutdown handlers while running a shutdown handler.
/// </summary>
public static void RemoveShutdownHandler(ShutdownHandler handler)
{
for (int index = ShutdownHandlers.Count - 1; index >= 0; --index)
{
if (ShutdownHandlers[index] == handler)
{
ShutdownHandlers.RemoveAt(index);
break;
}
}
}
/// <summary>
/// Run all the shutdown handlers.
///
/// They're run in opposite order they were added.
/// </summary>
static void ExecuteShutdownHandlers()
{
while(ShutdownHandlers.Count > 0)
{
var handler = ShutdownHandlers[ShutdownHandlers.Count - 1];
ShutdownHandlers.RemoveAt(ShutdownHandlers.Count - 1);
handler();
}
}
/// <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);
Runtime.CheckExceptionOccurred();
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);
Runtime.CheckExceptionOccurred();
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", (int)RunFlagType.File);
Runtime.CheckExceptionOccurred();
IntPtr m = Runtime.PyImport_ExecCodeModule(name, c);
Runtime.CheckExceptionOccurred();
return new PyObject(m);
}
public static PyObject Compile(string code, string filename = "", RunFlagType mode = RunFlagType.File)
{
var flag = (int)mode;
IntPtr ptr = Runtime.Py_CompileString(code, filename, flag);
Runtime.CheckExceptionOccurred();
return new PyObject(ptr);
}
/// <summary>
/// Eval Method
/// </summary>
/// <remarks>
/// Evaluate a Python expression and returns the result.
/// It's a subset of Python eval function.
/// </remarks>
public static PyObject Eval(string code, IntPtr? globals = null, IntPtr? locals = null)
{
PyObject result = RunString(code, globals, locals, RunFlagType.Eval);
return result;
}
/// <summary>
/// Exec Method
/// </summary>
/// <remarks>
/// Run a string containing Python code.
/// It's a subset of Python exec function.
/// </remarks>
public static void Exec(string code, IntPtr? globals = null, IntPtr? locals = null)
{
using (PyObject result = RunString(code, globals, locals, RunFlagType.File))
{
if (result.obj != Runtime.PyNone)
{
throw new PythonException();
}
}
}
/// <summary>
/// RunString Method. Function has been deprecated and will be removed.
/// Use Exec/Eval/RunSimpleString instead.
/// </summary>
[Obsolete("RunString is deprecated and will be removed. Use Exec/Eval/RunSimpleString instead.")]
public static PyObject RunString(string code, IntPtr? globals = null, IntPtr? locals = null)
{
return RunString(code, globals, locals, RunFlagType.File);
}
/// <summary>
/// Internal 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>
internal static PyObject RunString(string code, IntPtr? globals, IntPtr? locals, RunFlagType flag)
{
var borrowedGlobals = true;
if (globals == null)
{
globals = Runtime.PyEval_GetGlobals();
if (globals == IntPtr.Zero)
{
globals = Runtime.PyDict_New();
Runtime.PyDict_SetItemString(
globals.Value, "__builtins__",
Runtime.PyEval_GetBuiltins()
);
borrowedGlobals = false;
}
}
if (locals == null)
{
locals = globals;
}
try
{
NewReference result = Runtime.PyRun_String(
code, (IntPtr)flag, globals.Value, locals.Value
);
try
{
Runtime.CheckExceptionOccurred();
return result.MoveToPyObject();
}
finally
{
result.Dispose();
}
}
finally
{
if (!borrowedGlobals)
{
Runtime.XDecref(globals.Value);
}
}
}
}
public enum RunFlagType : int
{
Single = 256,
File = 257, /* Py_file_input */
Eval = 258
}
public static class Py
{
public static GILState GIL()
{
if (!PythonEngine.IsInitialized)
{
PythonEngine.Initialize();
}
return new GILState();
}
public static PyScope CreateScope()
{
var scope = PyScopeManager.Global.Create();
return scope;
}
public static PyScope CreateScope(string name)
{
var scope = PyScopeManager.Global.Create(name);
return scope;
}
public class GILState : IDisposable
{
private readonly IntPtr state;
private bool isDisposed;
internal GILState()
{
state = PythonEngine.AcquireLock();
}
public void Dispose()
{
if (this.isDisposed) return;
PythonEngine.ReleaseLock(state);
GC.SuppressFinalize(this);
this.isDisposed = true;
}
~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 (var 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.XDecref(value);
}
}
return dict;
}
public static PyObject Import(string name)
{
return PythonEngine.ImportModule(name);
}
public static void SetArgv()
{
IEnumerable<string> args;
try
{
args = Environment.GetCommandLineArgs();
}
catch (NotSupportedException)
{
args = Enumerable.Empty<string>();
}
SetArgv(
new[] { "" }.Concat(
Environment.GetCommandLineArgs().Skip(1)
)
);
}
public static void SetArgv(params string[] argv)
{
SetArgv(argv as IEnumerable<string>);
}
public static void SetArgv(IEnumerable<string> argv)
{
using (GIL())
{
string[] arr = argv.ToArray();
Runtime.PySys_SetArgvEx(arr.Length, arr, 0);
Runtime.CheckExceptionOccurred();
}
}
public static void With(PyObject obj, Action<dynamic> Body)
{
// Behavior described here:
// https://docs.python.org/2/reference/datamodel.html#with-statement-context-managers
IntPtr type = Runtime.PyNone;
IntPtr val = Runtime.PyNone;
IntPtr traceBack = Runtime.PyNone;
PythonException ex = null;
try
{
PyObject enterResult = obj.InvokeMethod("__enter__");
Body(enterResult);
}
catch (PythonException e)
{
ex = e;
type = ex.PyType.Coalesce(type);
val = ex.PyValue.Coalesce(val);
traceBack = ex.PyTB.Coalesce(traceBack);
}
Runtime.XIncref(type);
Runtime.XIncref(val);
Runtime.XIncref(traceBack);
var exitResult = obj.InvokeMethod("__exit__", new PyObject(type), new PyObject(val), new PyObject(traceBack));
if (ex != null && !exitResult.IsTrue()) throw ex;
}
}
}