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pythonnet/src/runtime/pythonexception.cs at master · attackgithub/pythonnet · GitHub
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runtime
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pythonexception.cs
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pythonnet
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src
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runtime
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pythonexception.cs
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using
System
;
namespace
Python
.
Runtime
{
/// <summary>
/// Provides a managed interface to exceptions thrown by the Python
/// runtime.
/// </summary>
public
class
PythonException
:
System
.
Exception
{
private
IntPtr
_pyType
=
IntPtr
.
Zero
;
private
IntPtr
_pyValue
=
IntPtr
.
Zero
;
private
IntPtr
_pyTB
=
IntPtr
.
Zero
;
private
string
_tb
=
""
;
private
string
_message
=
""
;
private
string
_pythonTypeName
=
""
;
private
bool
disposed
=
false
;
public
PythonException
(
)
{
IntPtr
gs
=
PythonEngine
.
AcquireLock
(
)
;
Runtime
.
PyErr_Fetch
(
ref
_pyType
,
ref
_pyValue
,
ref
_pyTB
)
;
Runtime
.
XIncref
(
_pyType
)
;
Runtime
.
XIncref
(
_pyValue
)
;
Runtime
.
XIncref
(
_pyTB
)
;
if
(
_pyType
!=
IntPtr
.
Zero
&&
_pyValue
!=
IntPtr
.
Zero
)
{
string
type
;
string
message
;
Runtime
.
XIncref
(
_pyType
)
;
using
(
var
pyType
=
new
PyObject
(
_pyType
)
)
using
(
PyObject
pyTypeName
=
pyType
.
GetAttr
(
"__name__"
)
)
{
type
=
pyTypeName
.
ToString
(
)
;
}
_pythonTypeName
=
type
;
Runtime
.
XIncref
(
_pyValue
)
;
using
(
var
pyValue
=
new
PyObject
(
_pyValue
)
)
{
message
=
pyValue
.
ToString
(
)
;
}
_message
=
type
+
" : "
+
message
;
}
if
(
_pyTB
!=
IntPtr
.
Zero
)
{
PyObject
tb_module
=
PythonEngine
.
ImportModule
(
"traceback"
)
;
Runtime
.
XIncref
(
_pyTB
)
;
using
(
var
pyTB
=
new
PyObject
(
_pyTB
)
)
{
_tb
=
tb_module
.
InvokeMethod
(
"format_tb"
,
pyTB
)
.
ToString
(
)
;
}
}
PythonEngine
.
ReleaseLock
(
gs
)
;
}
// Ensure that encapsulated Python objects are decref'ed appropriately
// when the managed exception wrapper is garbage-collected.
~
PythonException
(
)
{
// We needs to disable Finalizers until it's valid implementation.
// Current implementation can produce low probability floating bugs.
return
;
Dispose
(
)
;
}
/// <summary>
/// Restores python error.
/// </summary>
public
void
Restore
(
)
{
IntPtr
gs
=
PythonEngine
.
AcquireLock
(
)
;
Runtime
.
PyErr_Restore
(
_pyType
,
_pyValue
,
_pyTB
)
;
_pyType
=
IntPtr
.
Zero
;
_pyValue
=
IntPtr
.
Zero
;
_pyTB
=
IntPtr
.
Zero
;
PythonEngine
.
ReleaseLock
(
gs
)
;
}
/// <summary>
/// PyType Property
/// </summary>
/// <remarks>
/// Returns the exception type as a Python object.
/// </remarks>
public
IntPtr
PyType
{
get
{
return
_pyType
;
}
}
/// <summary>
/// PyValue Property
/// </summary>
/// <remarks>
/// Returns the exception value as a Python object.
/// </remarks>
public
IntPtr
PyValue
{
get
{
return
_pyValue
;
}
}
/// <summary>
/// PyTB Property
/// </summary>
/// <remarks>
/// Returns the TraceBack as a Python object.
/// </remarks>
public
IntPtr
PyTB
{
get
{
return
_pyTB
;
}
}
/// <summary>
/// Message Property
/// </summary>
/// <remarks>
/// A string representing the python exception message.
/// </remarks>
public
override
string
Message
{
get
{
return
_message
;
}
}
/// <summary>
/// StackTrace Property
/// </summary>
/// <remarks>
/// A string representing the python exception stack trace.
/// </remarks>
public
override
string
StackTrace
{
get
{
return
_tb
;
}
}
/// <summary>
/// Python error type name.
/// </summary>
public
string
PythonTypeName
{
get
{
return
_pythonTypeName
;
}
}
/// <summary>
/// Dispose Method
/// </summary>
/// <remarks>
/// The Dispose method provides a way to explicitly release the
/// Python objects represented by a PythonException.
/// If object not properly disposed can cause AppDomain unload issue.
/// See GH#397 and GH#400.
/// </remarks>
public
void
Dispose
(
)
{
if
(
!
disposed
)
{
if
(
Runtime
.
Py_IsInitialized
(
)
>
0
&&
!
Runtime
.
IsFinalizing
)
{
IntPtr
gs
=
PythonEngine
.
AcquireLock
(
)
;
Runtime
.
XDecref
(
_pyType
)
;
Runtime
.
XDecref
(
_pyValue
)
;
// XXX Do we ever get TraceBack? //
if
(
_pyTB
!=
IntPtr
.
Zero
)
{
Runtime
.
XDecref
(
_pyTB
)
;
}
PythonEngine
.
ReleaseLock
(
gs
)
;
}
GC
.
SuppressFinalize
(
this
)
;
disposed
=
true
;
}
}
/// <summary>
/// Matches Method
/// </summary>
/// <remarks>
/// Returns true if the Python exception type represented by the
/// PythonException instance matches the given exception type.
/// </remarks>
public
static
bool
Matches
(
IntPtr
ob
)
{
return
Runtime
.
PyErr_ExceptionMatches
(
ob
)
!=
0
;
}
}
}
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