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subinterpreter.c
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subinterpreter.c
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#include <sys/queue.h>
#include <Python.h>
#include <assert.h>
#include <string.h>
#define MAX_INTERPRETER_NAME_LEN 100
#ifdef PYTHON311OLDER
PyObject *PyErr_GetRaisedException() {
PyObject *type, *value, *traceback;
PyErr_Fetch(&type, &value, &traceback);
PyErr_NormalizeException(&type, &value, &traceback);
return value;
}
#endif
#define SUBINTERPRETER_SWITCH \
struct interpr *sub_interpreter = get_interpreter(interpreter_name); \
PyGILState_STATE gil = PyGILState_Ensure(); \
if (NULL == sub_interpreter) { \
PyErr_Format(PyExc_KeyError, "Subinterpreter '%s' does not exist.", \
interpreter_name); \
PyGILState_Release(gil); \
return PyErr_GetRaisedException(); \
} \
PyThreadState *orig_tstate = PyThreadState_Get(); \
PyThreadState_Swap(sub_interpreter->python_interpreter); \
PyObject *ret = NULL; \
PyObject *exception = PyErr_GetRaisedException(); \
if (exception) \
return exception;
#define SETUP_RET \
if (PyUnicode_GetLength(target_name) > 0) { \
ret = Py_True; \
PyObject_SetItem(global_dict, target_name, obj); \
exception = PyErr_GetRaisedException(); \
Py_DECREF(obj); \
} else { \
ret = obj; \
}
#define SUBINTERPRETER_RETURN \
PyThreadState_Swap(orig_tstate); \
PyGILState_Release(gil); \
assert(ret || exception); \
if (NULL == exception) { \
return ret; \
} else { \
Py_XDECREF(ret); \
return exception; \
}
// man 3 list
struct interpr {
PyThreadState *python_interpreter;
PyObject *main_module;
char *name;
LIST_ENTRY(interpr) entries;
};
LIST_HEAD(listhead, interpr);
struct listhead head;
void init_interpreter_list() {
LIST_INIT(&head);
}
struct interpr *get_interpreter(char *name) {
struct interpr *ret = NULL;
struct interpr *iter;
LIST_FOREACH(iter, &head, entries) {
if (0 == strncmp(iter->name, name, MAX_INTERPRETER_NAME_LEN)) {
ret = iter;
break;
}
}
return ret;
}
PyObject *make_interpreter(char *interpreter_name) {
PyGILState_STATE gil = PyGILState_Ensure();
PyThreadState *tstate = NULL;
PyThreadState *orig_tstate = PyThreadState_Get();
struct interpr *maybe_existing_interpreter = get_interpreter(interpreter_name);
if (NULL != maybe_existing_interpreter) {
PyGILState_Release(gil);
return Py_True;
}
tstate = Py_NewInterpreter();
if (NULL == tstate) {
PyGILState_Release(gil);
return Py_False;
}
PyThreadState_Swap(tstate);
unsigned int name_len = strnlen(interpreter_name, MAX_INTERPRETER_NAME_LEN) + 1;
char *name = malloc(name_len);
assert(name);
strncpy(name, interpreter_name, name_len);
PyObject *main_module = PyImport_AddModule("__main__");
PyThreadState_Swap(orig_tstate);
PyGILState_Release(gil);
struct interpr *new_interpreter = malloc(sizeof(struct interpr));
assert(new_interpreter);
new_interpreter->name = name;
new_interpreter->python_interpreter = tstate;
new_interpreter->main_module = main_module;
LIST_INSERT_HEAD(&head, new_interpreter, entries);
return Py_True;
}
PyObject *destroy_subinterpreter(char *interpreter_name) {
SUBINTERPRETER_SWITCH;
Py_EndInterpreter(sub_interpreter->python_interpreter);
free(sub_interpreter->name);
LIST_REMOVE(sub_interpreter, entries);
free(sub_interpreter);
ret = Py_True;
SUBINTERPRETER_RETURN;
}
PyObject *list_subinterpreters() {
struct interpr *iter;
PyObject *ret_list = PyList_New(0);
LIST_FOREACH(iter, &head, entries) {
PyObject *interpreter_name = PyUnicode_FromString(iter->name);
PyList_Append(ret_list, interpreter_name);
Py_DECREF(interpreter_name);
}
return ret_list;
}
PyObject *import_module(char *interpreter_name, PyObject *name, PyObject *as) {
SUBINTERPRETER_SWITCH;
PyObject *global_dict = PyModule_GetDict(sub_interpreter->main_module);
ret = Py_True;
PyObject *module = PyImport_Import(name); // New reference
exception = PyErr_GetRaisedException();
if (exception)
goto finish;
PyObject_SetItem(global_dict, as, module);
exception = PyErr_GetRaisedException();
finish:
Py_XDECREF(module);
SUBINTERPRETER_RETURN;
}
PyObject *eval_string(char *interpreter_name, char *string, PyObject *target_name) {
SUBINTERPRETER_SWITCH;
PyObject *global_dict = PyModule_GetDict(sub_interpreter->main_module);
PyObject *local_dict = PyDict_New();
PyObject *obj = PyRun_String(string, Py_eval_input, global_dict, local_dict);
exception = PyErr_GetRaisedException();
if (exception)
goto finish;
SETUP_RET;
finish:
SUBINTERPRETER_RETURN;
}
PyObject *exec_string(char *interpreter_name, char *string) {
SUBINTERPRETER_SWITCH;
ret = Py_True;
int simple_string_ret = PyRun_SimpleString(string);
if (-1 == simple_string_ret) {
PyErr_Format(PyExc_Exception,
"PyRun_SimpleString inside subinterpreter '%s' raised exception.",
interpreter_name);
}
exception = PyErr_GetRaisedException();
if (exception)
goto finish;
// SETUP_RET assumes target_name
finish:
SUBINTERPRETER_RETURN;
}
PyObject *call_py(char *interpreter_name, PyObject *obj_name, PyObject *method_name,
PyObject *target_name, PyObject *args_pytuple, PyObject *kwargs_pydict) {
SUBINTERPRETER_SWITCH;
PyObject *global_dict = PyModule_GetDict(sub_interpreter->main_module);
PyObject *call_obj = PyObject_GetItem(global_dict, obj_name); // New reference
PyObject *obj = NULL;
PyObject *method = NULL;
if (NULL == call_obj) {
PyErr_Clear();
PyObject *builtins_name = PyUnicode_FromString("__builtins__");
PyObject *builtins = PyObject_GetItem(global_dict, builtins_name);
Py_DECREF(builtins_name);
call_obj = PyObject_GetAttr(builtins, obj_name); // New reference
}
exception = PyErr_GetRaisedException();
if (exception)
goto finish;
assert(call_obj);
if (1 != PyObject_IsTrue(kwargs_pydict)) {
kwargs_pydict = NULL;
}
if (1 == PyObject_IsTrue(method_name)) {
method = PyObject_GetAttr(call_obj, method_name); // New reference
exception = PyErr_GetRaisedException();
if (exception)
goto finish;
if (0 == PyCallable_Check(method)) {
PyErr_SetObject(PyExc_ValueError, method_name);
exception = PyErr_GetRaisedException();
goto finish;
}
obj = PyObject_Call(method, args_pytuple, kwargs_pydict); // New reference
} else {
obj = PyObject_Call(call_obj, args_pytuple, kwargs_pydict); // New reference
}
exception = PyErr_GetRaisedException();
if (exception)
goto finish;
SETUP_RET;
finish:
Py_XDECREF(call_obj);
Py_XDECREF(method);
SUBINTERPRETER_RETURN;
}
PyObject *get_global_variable(char *interpreter_name, PyObject *var_name) {
SUBINTERPRETER_SWITCH;
PyObject *global_dict = PyModule_GetDict(sub_interpreter->main_module);
// Doc don't mention it but it will raise exception on wrong key
ret = PyObject_GetItem(global_dict, var_name); // New reference
exception = PyErr_GetRaisedException();
SUBINTERPRETER_RETURN;
}
PyObject *get_object_attr(char *interpreter_name, PyObject *obj_name, PyObject *attr_name,
PyObject *target_name) {
SUBINTERPRETER_SWITCH;
PyObject *global_dict = PyModule_GetDict(sub_interpreter->main_module);
PyObject *obj = NULL;
PyObject *holding_obj = PyObject_GetItem(global_dict, obj_name); // New reference
if (NULL == holding_obj) {
PyErr_SetObject(PyExc_KeyError, holding_obj);
exception = PyErr_GetRaisedException();
goto finish;
}
obj = PyObject_GetAttr(holding_obj, attr_name); // New reference
if (NULL == obj) {
PyErr_SetObject(PyExc_AttributeError, attr_name);
exception = PyErr_GetRaisedException();
goto finish;
}
SETUP_RET;
finish:
Py_XDECREF(holding_obj);
SUBINTERPRETER_RETURN;
}
PyObject *set_global(char *interpreter_name, PyObject *obj, PyObject *as) {
SUBINTERPRETER_SWITCH;
PyObject *global_dict = PyModule_GetDict(sub_interpreter->main_module);
PyObject_SetItem(global_dict, as, obj);
exception = PyErr_GetRaisedException();
ret = Py_NewRef(as);
SUBINTERPRETER_RETURN;
}