pythonnet/pythonnet/__init__.py at master · baby636/pythonnet · GitHub

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import sys

from pathlib import Path

from typing import Dict, Optional, Union

import clr_loader

__all__ = ["set_runtime", "set_default_runtime", "load"]

_RUNTIME: Optional[clr_loader.Runtime] = None

_LOADER_ASSEMBLY: Optional[clr_loader.wrappers.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_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, str]] = None

) -> clr_loader.Runtime:

if spec == "default":

if sys.platform == "win32":

spec = "netfx"

else:

spec = "mono"

params = params or _get_params_from_env(spec)

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}'")

def set_default_runtime() -> None:

"""Set up the default runtime

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

print("Set default RUNTIME")

raise RuntimeError("Shouldn't be called here")

spec = environ.get("PYTHONNET_RUNTIME", "default")

runtime = _create_runtime_from_spec(spec)

set_runtime(runtime)

def load(

runtime: Union[clr_loader.Runtime, str] = "default", **params: Dict[str, 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."""

global _LOADED, _LOADER_ASSEMBLY

if _LOADED:

return

if _RUNTIME is None:

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 = _RUNTIME.get_assembly(str(dll_path))

func = _LOADER_ASSEMBLY["Python.Runtime.Loader.Initialize"]

if func(b"") != 0:

raise RuntimeError("Failed to initialize Python.Runtime.dll")

import atexit

atexit.register(unload)

def unload() -> None:

"""Explicitly unload a laoded runtime and shut down Python.NET"""

global _RUNTIME, _LOADER_ASSEMBLY

if _LOADER_ASSEMBLY is not None:

func = _LOADER_ASSEMBLY["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:

# TODO: Add explicit `close` to clr_loader

_RUNTIME = None

pythonnet/pythonnet/init.py at master · baby636/pythonnet · GitHub

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