/
pickle.go
141 lines (131 loc) · 4.05 KB
/
pickle.go
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package main
/*
#cgo pkg-config: python
#include <Python.h>
#define INLINE __attribute__((always_inline))
INLINE int myPyString_Check(PyObject *o) {return PyString_Check(o);}
INLINE int myPyDict_Check(PyObject *o) {return PyDict_Check(o);}
INLINE int myPyInt_Check(PyObject *o) {return PyInt_Check(o);}
INLINE int myPyTuple_Check(PyObject *o) {return PyTuple_Check(o);}
INLINE PyObject *PyObject_CallFunction1(PyObject *f, PyObject *o1)
{return PyObject_CallFunctionObjArgs(f, o1, NULL);}
INLINE PyObject *PyObject_CallFunction2(PyObject *f, PyObject *o1, PyObject *o2)
{return PyObject_CallFunctionObjArgs(f, o1, o2, NULL);}
INLINE PyObject *PyNone() {Py_INCREF(Py_None); return Py_None;}
*/
import "C"
import (
"sync"
"unsafe"
)
var initialized int = 0
var pickleLoads *C.PyObject
var pickleDumps *C.PyObject
var highestProtocol *C.PyObject
var pickleLock sync.Mutex
func pickleInit() {
C.Py_Initialize()
var cPickle *C.PyObject = C.PyImport_ImportModule(C.CString("cPickle"))
pickleLoads = C.PyObject_GetAttrString(cPickle, C.CString("loads"))
pickleDumps = C.PyObject_GetAttrString(cPickle, C.CString("dumps"))
highestProtocol = C.PyObject_GetAttrString(cPickle, C.CString("HIGHEST_PROTOCOL"))
C.Py_DecRef(cPickle)
initialized = 1
}
func pyObjToInterface(o *C.PyObject) interface{} {
if C.myPyString_Check(o) != 0 {
return C.GoStringN(C.PyString_AsString(o), C.int(C.PyString_Size(o)))
} else if C.myPyInt_Check(o) != 0 {
return int64(C.PyInt_AsLong(o))
} else if C.myPyDict_Check(o) != 0 {
v := make(map[interface{}]interface{})
items := C.PyDict_Items(o)
for i := 0; i < int(C.PyTuple_Size(items)); i++ {
item := C.PyTuple_GetItem(items, C.Py_ssize_t(i))
key := C.PyTuple_GetItem(item, 0)
value := C.PyTuple_GetItem(item, 1)
v[pyObjToInterface(key)] = pyObjToInterface(value)
}
C.Py_DecRef(items)
return v
} else if C.myPyTuple_Check(o) != 0 {
length := int(C.PyTuple_Size(o))
list := make([]interface{}, length)
for i := 0; i < length; i++ {
list[i] = pyObjToInterface(C.PyTuple_GetItem(o, C.Py_ssize_t(i)))
}
return list
}
return nil
}
func dictAddItem(dict *C.PyObject, key interface{}, value interface{}) {
pykey := interfaceToPyObj(key)
pyvalue := interfaceToPyObj(value)
C.PyDict_SetItem(dict, pykey, pyvalue)
C.Py_DecRef(pykey)
C.Py_DecRef(pyvalue)
}
func interfaceToPyObj(o interface{}) *C.PyObject {
switch o.(type) {
case int:
return C.PyInt_FromLong(C.long(o.(int)))
case int64:
return C.PyInt_FromLong(C.long(o.(int64)))
case string:
strvalue := C.CString(o.(string))
defer C.free(unsafe.Pointer(strvalue))
return C.PyString_FromStringAndSize(strvalue, C.Py_ssize_t(len(o.(string))))
case map[interface{}]interface{}:
dict := C.PyDict_New()
for key, value := range o.(map[interface{}]interface{}) {
dictAddItem(dict, key, value)
}
return dict
case map[string]string:
dict := C.PyDict_New()
for key, value := range o.(map[string]string) {
dictAddItem(dict, key, value)
}
return dict
case map[string]interface{}:
dict := C.PyDict_New()
for key, value := range o.(map[string]interface{}) {
dictAddItem(dict, key, value)
}
return dict
case []interface{}:
list := C.PyTuple_New(C.Py_ssize_t(len(o.([]interface{}))))
for i := range o.([]interface{}) {
C.PyTuple_SetItem(list, C.Py_ssize_t(i), interfaceToPyObj(o.([]interface{})[i]))
}
return list
default:
return C.PyNone()
}
}
func PickleLoads(data []byte) interface{} {
pickleLock.Lock()
if initialized == 0 {
pickleInit()
}
str := C.PyString_FromStringAndSize((*C.char)(unsafe.Pointer(&data[0])), C.Py_ssize_t(len(data)))
obj := C.PyObject_CallFunction1(pickleLoads, str)
v := pyObjToInterface(obj)
C.Py_DecRef(obj)
C.Py_DecRef(str)
pickleLock.Unlock()
return v
}
func PickleDumps(v interface{}) []byte {
pickleLock.Lock()
if initialized == 0 {
pickleInit()
}
obj := interfaceToPyObj(v)
str := C.PyObject_CallFunction2(pickleDumps, obj, highestProtocol)
gobytes := C.GoBytes(unsafe.Pointer(C.PyString_AsString(str)), C.int(C.PyString_Size(str)))
C.Py_DecRef(obj)
C.Py_DecRef(str)
pickleLock.Unlock()
return gobytes
}