forked from pythonnet/pythonnet
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathPyObjectConversions.cs
More file actions
160 lines (134 loc) · 5.49 KB
/
PyObjectConversions.cs
File metadata and controls
160 lines (134 loc) · 5.49 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
namespace Python.Runtime
{
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using Python.Runtime.Codecs;
/// <summary>
/// This class allows to register additional marshalling codecs.
/// <para>Python.NET will pick suitable encoder/decoder registered first</para>
/// </summary>
public static class PyObjectConversions
{
static readonly DecoderGroup decoders = new();
static readonly EncoderGroup encoders = new();
/// <summary>
/// Registers specified encoder (marshaller)
/// <para>Python.NET will pick suitable encoder/decoder registered first</para>
/// </summary>
public static void RegisterEncoder(IPyObjectEncoder encoder)
{
if (encoder == null) throw new ArgumentNullException(nameof(encoder));
lock (encoders)
{
encoders.Add(encoder);
}
}
/// <summary>
/// Registers specified decoder (unmarshaller)
/// <para>Python.NET will pick suitable encoder/decoder registered first</para>
/// </summary>
public static void RegisterDecoder(IPyObjectDecoder decoder)
{
if (decoder == null) throw new ArgumentNullException(nameof(decoder));
lock (decoders)
{
decoders.Add(decoder);
}
}
#region Encoding
internal static PyObject? TryEncode(object obj, Type type)
{
if (obj == null) throw new ArgumentNullException(nameof(obj));
if (type == null) throw new ArgumentNullException(nameof(type));
foreach (var encoder in clrToPython.GetOrAdd(type, GetEncoders))
{
var result = encoder.TryEncode(obj);
if (result != null) return result;
}
return null;
}
static readonly ConcurrentDictionary<Type, IPyObjectEncoder[]>
clrToPython = new();
static IPyObjectEncoder[] GetEncoders(Type type)
{
lock (encoders)
{
return encoders.GetEncoders(type).ToArray();
}
}
#endregion
#region Decoding
static readonly ConcurrentDictionary<TypePair, (PyType, Converter.TryConvertFromPythonDelegate?)> pythonToClr = new();
internal static bool TryDecode(BorrowedReference pyHandle, BorrowedReference pyType, Type targetType, out object? result)
{
if (pyHandle == null) throw new ArgumentNullException(nameof(pyHandle));
if (pyType == null) throw new ArgumentNullException(nameof(pyType));
if (targetType == null) throw new ArgumentNullException(nameof(targetType));
var key = new TypePair(pyType.DangerousGetAddress(), targetType);
var (_, decoder) = pythonToClr.GetOrAdd(key, pair => GetDecoder(pair.PyType, pair.ClrType));
result = null;
if (decoder == null) return false;
return decoder.Invoke(pyHandle, out result);
}
static (PyType, Converter.TryConvertFromPythonDelegate?) GetDecoder(IntPtr sourceType, Type targetType)
{
var sourceTypeRef = new BorrowedReference(sourceType);
Debug.Assert(PyType.IsType(sourceTypeRef));
var pyType = new PyType(sourceTypeRef, prevalidated: true);
IPyObjectDecoder? decoder;
lock (decoders)
{
decoder = decoders.GetDecoder(pyType, targetType);
if (decoder == null) return default;
}
var decode = genericDecode.MakeGenericMethod(targetType)!;
bool TryDecode(BorrowedReference pyHandle, out object? result)
{
var pyObj = new PyObject(pyHandle);
var @params = new object?[] { pyObj, null };
bool success = (bool)decode.Invoke(decoder, @params);
if (!success)
{
pyObj.Dispose();
}
result = @params[1];
return success;
}
// returning PyType here establishes strong reference to the object,
// that ensures the PyType we use as the converter cache key is not deallocated
return (pyType, TryDecode);
}
static readonly MethodInfo genericDecode = typeof(IPyObjectDecoder).GetMethod(nameof(IPyObjectDecoder.TryDecode));
#endregion
internal static void Reset()
{
lock (encoders)
lock (decoders)
{
clrToPython.Clear();
pythonToClr.Clear();
encoders.Dispose();
decoders.Dispose();
}
}
struct TypePair : IEquatable<TypePair>
{
internal readonly IntPtr PyType;
internal readonly Type ClrType;
public TypePair(IntPtr pyType, Type clrType)
{
this.PyType = pyType;
this.ClrType = clrType;
}
public override int GetHashCode()
=> this.ClrType.GetHashCode() ^ this.PyType.GetHashCode();
public bool Equals(TypePair other)
=> this.PyType == other.PyType && this.ClrType == other.ClrType;
public override bool Equals(object obj) => obj is TypePair other && this.Equals(other);
}
}
}