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Python.NET/pythonnet/__init__.py at master · ngogiaphat/Python.NET · GitHub
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pythonnet
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__init__.py
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Python.NET
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pythonnet
/
__init__.py
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"""Python.NET runtime loading and configuration"""
import
sys
from
pathlib
import
Path
from
typing
import
Dict
,
Optional
,
Union
,
Any
import
clr_loader
__all__
=
[
"set_runtime"
,
"set_runtime_from_env"
,
"load"
,
"unload"
,
"get_runtime_info"
]
_RUNTIME
:
Optional
[
clr_loader
.
Runtime
]
=
None
_LOADER_ASSEMBLY
:
Optional
[
clr_loader
.
Assembly
]
=
None
_LOADED
:
bool
=
False
def
set_runtime
(
runtime
:
Union
[
clr_loader
.
Runtime
,
str
],
**
params
:
str
)
->
None
:
"""Set up a clr_loader runtime without loading it
:param runtime:
Either an already initialised `clr_loader` runtime, or one of netfx,
coreclr, mono, or default. If a string parameter is given, the runtime
will be created.
"""
global
_RUNTIME
if
_LOADED
:
raise
RuntimeError
(
f"The runtime
{
_RUNTIME
}
has already been loaded"
)
if
isinstance
(
runtime
,
str
):
runtime
=
_create_runtime_from_spec
(
runtime
,
params
)
_RUNTIME
=
runtime
def
get_runtime_info
()
->
Optional
[
clr_loader
.
RuntimeInfo
]:
"""Retrieve information on the configured runtime"""
if
_RUNTIME
is
None
:
return
None
else
:
return
_RUNTIME
.
info
()
def
_get_params_from_env
(
prefix
:
str
)
->
Dict
[
str
,
str
]:
from
os
import
environ
full_prefix
=
f"PYTHONNET_
{
prefix
.
upper
()
}
_"
len_
=
len
(
full_prefix
)
env_vars
=
{
(
k
[
len_
:].
lower
()):
v
for
k
,
v
in
environ
.
items
()
if
k
.
upper
().
startswith
(
full_prefix
)
}
return
env_vars
def
_create_runtime_from_spec
(
spec
:
str
,
params
:
Optional
[
Dict
[
str
,
Any
]]
=
None
)
->
clr_loader
.
Runtime
:
was_default
=
False
if
spec
==
"default"
:
was_default
=
True
if
sys
.
platform
==
"win32"
:
spec
=
"netfx"
else
:
spec
=
"mono"
params
=
params
or
_get_params_from_env
(
spec
)
try
:
if
spec
==
"netfx"
:
return
clr_loader
.
get_netfx
(
**
params
)
elif
spec
==
"mono"
:
return
clr_loader
.
get_mono
(
**
params
)
elif
spec
==
"coreclr"
:
return
clr_loader
.
get_coreclr
(
**
params
)
else
:
raise
RuntimeError
(
f"Invalid runtime name: '
{
spec
}
'"
)
except
Exception
as
exc
:
if
was_default
:
raise
RuntimeError
(
f"""Failed to create a default .NET runtime, which would
have been "
{
spec
}
" on this system. Either install a
compatible runtime or configure it explicitly via
`set_runtime` or the `PYTHONNET_*` environment variables
(see set_runtime_from_env)."""
)
from
exc
else
:
raise
RuntimeError
(
f"""Failed to create a .NET runtime (
{
spec
}
) using the
parameters
{
params
}
."""
)
from
exc
def
set_runtime_from_env
()
->
None
:
"""Set up the runtime using the environment
This will use the environment variable PYTHONNET_RUNTIME to decide the
runtime to use, which may be one of netfx, coreclr or mono. The parameters
of the respective clr_loader.get_<runtime> functions can also be given as
environment variables, named `PYTHONNET_<RUNTIME>_<PARAM_NAME>`. In
particular, to use `PYTHONNET_RUNTIME=coreclr`, the variable
`PYTHONNET_CORECLR_RUNTIME_CONFIG` has to be set to a valid
`.runtimeconfig.json`.
If no environment variable is specified, a globally installed Mono is used
for all environments but Windows, on Windows the legacy .NET Framework is
used.
"""
from
os
import
environ
spec
=
environ
.
get
(
"PYTHONNET_RUNTIME"
,
"default"
)
runtime
=
_create_runtime_from_spec
(
spec
)
set_runtime
(
runtime
)
def
load
(
runtime
:
Union
[
clr_loader
.
Runtime
,
str
,
None
]
=
None
,
**
params
:
str
)
->
None
:
"""Load Python.NET in the specified runtime
The same parameters as for `set_runtime` can be used. By default,
`set_default_runtime` is called if no environment has been set yet and no
parameters are passed.
After a successful call, further invocations will return immediately."""
global
_LOADED
,
_LOADER_ASSEMBLY
if
_LOADED
:
return
if
_RUNTIME
is
None
:
if
runtime
is
None
:
set_runtime_from_env
()
else
:
set_runtime
(
runtime
,
**
params
)
if
_RUNTIME
is
None
:
raise
RuntimeError
(
"No valid runtime selected"
)
dll_path
=
Path
(
__file__
).
parent
/
"runtime"
/
"Python.Runtime.dll"
_LOADER_ASSEMBLY
=
assembly
=
_RUNTIME
.
get_assembly
(
str
(
dll_path
))
func
=
assembly
.
get_function
(
"Python.Runtime.Loader.Initialize"
)
if
func
(
b""
)
!=
0
:
raise
RuntimeError
(
"Failed to initialize Python.Runtime.dll"
)
_LOADED
=
True
import
atexit
atexit
.
register
(
unload
)
def
unload
()
->
None
:
"""Explicitly unload a loaded runtime and shut down Python.NET"""
global
_RUNTIME
,
_LOADER_ASSEMBLY
if
_LOADER_ASSEMBLY
is
not
None
:
func
=
_LOADER_ASSEMBLY
.
get_function
(
"Python.Runtime.Loader.Shutdown"
)
if
func
(
b"full_shutdown"
)
!=
0
:
raise
RuntimeError
(
"Failed to call Python.NET shutdown"
)
_LOADER_ASSEMBLY
=
None
if
_RUNTIME
is
not
None
:
_RUNTIME
.
shutdown
()
_RUNTIME
=
None
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