PyObjectTracerSample

# coding: UTF-8

""" 非常に簡単なサンプル """
class Monitoring(dict):
    @classmethod
    def _printCodeInfo(cls, cur_frame):
        import inspect
        bac_frame = cur_frame.f_back  # この関数の呼び出し元のフレームオブジェクトを取得。
        bac_frame_co = bac_frame.f_code 
        # print("呼び出し元関数名 = {}".format(bac_frame_co.co_name))
        bac_frame_info = inspect.getframeinfo(bac_frame)  # フレームオブジェクトのフレームレコードを取得。
        print("@@ %03d : func %s - %s" % (bac_frame.f_lineno, bac_frame_co.co_name, bac_frame_info.code_context))
        #print("cur local variables {}".format(cur_frame.f_locals))
        print("bac local variables {}".format(bac_frame.f_locals))

    def __new__(cls, initial={}):
        import inspect
        cls._printCodeInfo(inspect.currentframe())
        print('called __new__:')
        obj = super(Monitoring, cls).__new__(cls, initial={})
        print("    >>>> instance id = %s" % id(obj))
        return obj
    
    def __getattr__(self, key):
        value = self.__getitem__(key)
        import inspect
        self.__class__._printCodeInfo(inspect.currentframe())
        print('called __getattr__: id = %s (%s, %s = %s)' % (id(self), key, value, type(value)))
        return value

    def __setattr__(self, key, value):
        import inspect
        self.__class__._printCodeInfo(inspect.currentframe())
        result = self.__setitem__(key, value)
        print('called __setattr__: id = %s (%s, %s = %s)' % (id(self), key, value, type(value)))
        return result
        
    def __getattribute__(self, key):
        #print("====================== key = %s" % (key))
        v = object.__getattribute__(self, key)        
        if key == 'printCodeInfo':
            return v.__get__(None, self) # 内部処理はフィルタする
        if hasattr(v, '__get__'):
            import inspect
            self.__class__._printCodeInfo(inspect.currentframe())
            print('called __getattribute__: id = %s (%s AS function)' % (id(self), key))
            return v.__get__(None, self)
        if key == '__getitem__': # これは getter アクセスの副作用
            pass 
        elif key == '__setitem__': # これは setter アクセスの副作用
            pass
        elif key == '__class__': # これは上の printCodeInfo を呼び出すための __class__ 呼び出しの副作用
            pass
        else:
            print('called __getattribute__: id = %s (%s AS variable)' % (id(self), key))
        return v

# ================ トレースする対象となるオブジェクト



class Foo(Monitoring):
    def __init__(self, x):
        #print("__init__ called ")
        self.a = x

    def add(self, x):
        self.a += x


# ================ ここから主プログラム

print("##########")
obj1 = Foo(100)
print(" obj1 id = %s" % id(obj1) )
obj2 = Foo(200)
print(" obj2 id = %s" % id(obj2) )
print("##########")
obj1.add(200)
print(" obj1 id = %s" % id(obj1) )
print("##########")
print obj1.a
print obj2.a

実行結果はこんな感じ。

$ python sample1_newhook6.py

@@ 076 : func - ['obj1 = Foo(100)\n']
bac local variables {'Monitoring': <class 'main.Monitoring'>, 'builtins': <module 'builtin' (built-in)>, 'file': 'sample1_newhook6.py', 'package': None, 'name': 'main', 'Foo': <class 'main.Foo'>, 'doc': ' \xe9\x9d..... 中略 '}
called new:
>>>> instance id = 4502289376
@@ 067 : func init - [' self.a = x\n']
bac local variables {'x': 100, 'self': {}}
called setattr: id = 4502289376 (a, 100 = <type 'int'>)
obj1 id = 4502289376
@@ 078 : func - ['obj2 = Foo(200)\n']
bac local variables {'obj1': {'a': 100}, 'Monitoring': <class 'main.Monitoring'>, 'builtins': <module 'builtin' (built-in)>, 'file': 'sample1_newhook6.py', 'package': None, 'name': 'main', 'Foo': <class 'main.Foo'>, 'doc': ' \xe9\x9d....中略 '}
called new:
>>>> instance id = 4502289672
@@ 067 : func init - [' self.a = x\n']
bac local variables {'x': 200, 'self': {}}
called setattr: id = 4502289672 (a, 200 = <type 'int'>)
obj2 id = 4502289672

@@ 081 : func - ['obj1.add(200)\n']
bac local variables {'obj1': {'a': 100}, 'obj2': {'a': 200}, 'Monitoring': <class 'main.Monitoring'>, 'builtins': <module 'builtin' (built-in)>, 'file': 'sample1_newhook6.py', 'package': None, 'name': 'main', 'Foo': <class 'main.Foo'>, 'doc': ' \xe9\x9d....中略 '}
called getattribute: id = 4502289376 (add AS function)
@@ 070 : func add - [' self.a += x\n']
bac local variables {'x': 200, 'self': {'a': 100}}
called getattr: id = 4502289376 (a, 100 = <type 'int'>)
@@ 070 : func add - [' self.a += x\n']
bac local variables {'x': 200, 'self': {'a': 100}}
called setattr: id = 4502289376 (a, 300 = <type 'int'>)
obj1 id = 4502289376

@@ 084 : func - ['print obj1.a\n']
bac local variables {'obj1': {'a': 300}, 'obj2': {'a': 200}, 'Monitoring': <class 'main.Monitoring'>, 'builtins': <module 'builtin' (built-in)>, 'file': 'sample1_newhook6.py', 'package': None, 'name': 'main', 'Foo': <class 'main.Foo'>, 'doc': ' \xe9\x9d.....中略 '}
called getattr: id = 4502289376 (a, 300 = <type 'int'>)
300
@@ 085 : func - ['print obj2.a\n']
bac local variables {'obj1': {'a': 300}, 'obj2': {'a': 200}, 'Monitoring': <class 'main.Monitoring'>, 'builtins': <module 'builtin' (built-in)>, 'file': 'sample1_newhook6.py', 'package': None, 'name': 'main', 'Foo': <class 'main.Foo'>, 'doc': ' \xe9\x9d\x9e.....中略 '}
called getattr: id = 4502289672 (a, 200 = <type 'int'>)
200
$