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[转]Python 探针实现原理

 3 years ago
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  • sys.meta_path
  • sitecustomize.py

sys.meta_path

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import sys

class MetaPathFinder:

    def find_module(self, fullname, path=None):
        print('find_module {}'.format(fullname))
        return MetaPathLoader()

class MetaPathLoader:

    def load_module(self, fullname):
        print('load_module {}'.format(fullname))
        sys.modules[fullname] = sys
        return sys

sys.meta_path.insert(0, MetaPathFinder())

if __name__ == '__main__':
    import http
    print(http)
    print(http.version_info)

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$ python meta_path1.py
find_module http
load_module http
<module 'sys' (built-in)>
sys.version_info(major=3, minor=5, micro=1, releaselevel='final', serial=0)

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 import functools
 import time}
def func_wrapper(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        print('start func')
        start = time.time()
        result = func(*args, **kwargs)
        end = time.time()
        print('spent {}s'.format(end - start))
        return result
    return wrapper

def sleep(n):
    time.sleep(n)
    return n

if __name__ == '__main__':
    func = func_wrapper(sleep)
    print(func(3))

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$ python func_wrapper.py
start func
spent 3.004966974258423s
3

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import time

def sleep(n):
    time.sleep(n)
    return n

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import functools
import importlib
import sys
import time

_hook_modules = {'hello'}

class MetaPathFinder:

    def find_module(self, fullname, path=None):
        print('find_module {}'.format(fullname))
        if fullname in _hook_modules:
            return MetaPathLoader()

class MetaPathLoader:

    def load_module(self, fullname):
        print('load_module {}'.format(fullname))
        # ``sys.modules`` 中保存的是已经导入过的 module
        if fullname in sys.modules:
            return sys.modules[fullname]

        # 先从 sys.meta_path 中删除自定义的 finder
        # 防止下面执行 import_module 的时候再次触发此 finder
        # 从而出现递归调用的问题
        finder = sys.meta_path.pop(0)
        # 导入 module
        module = importlib.import_module(fullname)

        module_hook(fullname, module)

        sys.meta_path.insert(0, finder)
        return module

sys.meta_path.insert(0, MetaPathFinder())

def module_hook(fullname, module):
    if fullname == 'hello':
        module.sleep = func_wrapper(module.sleep)

def func_wrapper(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        print('start func')
        start = time.time()
        result = func(*args, **kwargs)
        end = time.time()
        print('spent {}s'.format(end - start))
        return result
    return wrapper

Jqw6SbPtqE3oIMcTSCS4Ag==

>>> import hook
>>> import hello
find_module hello
load_module hello
>>>
>>> hello.sleep(3)
start func
spent 3.0029919147491455s
3
>>>

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sitecustomize.py

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$ tree
.
├── sitecustomize.py
└── usercustomize.py

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$ cat sitecustomize.py
print('this is sitecustomize')

q/v/yrY4xw8407c2FVHtoOXdlurDPwAAANXDV7N9bn0=

$ cat usercustomize.py
print('this is usercustomize')

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$ export PYTHONPATH=.
$ python
this is sitecustomize       <----
this is usercustomize       <----
Python 3.5.1 (default, Dec 24 2015, 17:20:27)
[GCC 4.2.1 Compatible Apple LLVM 7.0.2 (clang-700.1.81)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>

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h1/KiQr1xi8sqIZlvZY5lQ==

$ tree
.
├── hello.py
├── hook.py
├── sitecustomize.py

lYSzgv9aZxHhBGwvH6ea4WgEalz16qXAuNtNdExJSu8=

$ cat sitecustomize.py
import hook

y8YelPkRbYdg5spvCnjHmQ==

$ export PYTHONPATH=.
$ python
find_module usercustomize
Python 3.5.1 (default, Dec 24 2015, 17:20:27)
[GCC 4.2.1 Compatible Apple LLVM 7.0.2 (clang-700.1.81)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
find_module readline
find_module atexit
find_module rlcompleter
>>>
>>> import hello
find_module hello
load_module hello
>>>
>>> hello.sleep(3)
start func
spent 3.005002021789551s
3

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agent

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$ mkdir bootstrap
$ mv hook.py bootstrap/_hook.py
$ touch bootstrap/__init__.py
$ touch agent.py
$ tree
.
├── bootstrap
│   ├── __init__.py
│   ├── _hook.py
│   └── sitecustomize.py
├── hello.py
├── test.py
├── agent.py

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$ cat bootstrap/sitecustomize.py
import _hook

//gZwFzJVPfCTeliJsX6q/Wd+X5ps1N2Db1F6fDcQjs=

import os
import sys

current_dir = os.path.dirname(os.path.realpath(__file__))
boot_dir = os.path.join(current_dir, 'bootstrap')

def main():
    args = sys.argv[1:]
    os.environ['PYTHONPATH'] = boot_dir
    # 执行后面的 python 程序命令
    # sys.executable 是 python 解释器程序的绝对路径 ``which python``
    # >>> sys.executable
    # '/usr/local/var/pyenv/versions/3.5.1/bin/python3.5'
    os.execl(sys.executable, sys.executable, *args)

if __name__ == '__main__':
    main()

2YDyWqqJxIY0lpCKoKziArmybwOCHhaLNAkx5cX2szZVxIO2VgKzSFzAyGrmEkF8

$ cat test.py
import sys
import hello

print(sys.argv)
print(hello.sleep(3))

TP+f2fNvVSuODecBKCRNQA==

$ python agent.py test.py arg1 arg2
find_module usercustomize
find_module hello
load_module hello
['test.py', 'arg1', 'arg2']
start func
spent 3.005035161972046s
3

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