Python中pluggy框架如何应用，详细的实例是怎样的-群英

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实践环境

Python 3.6.5

pluggy 0.13.0

例1 注册类函数为插件函数

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import pluggy
hookspec = pluggy.HookspecMarker("myproject")  # hook 标签 用于标记hook
hookimpl = pluggy.HookimplMarker("myproject")  # hook 实现标签 用于标记hook的一个或多个实现
class MySpec(object):
    """hook 集合"""
    @hookspec
    def myhook(self, arg1, arg2):
        pass
    @hookspec
    def my_hook_func1(self, arg1, arg2):
        pass
    @hookspec
    def my_hook_func2(self, arg1, arg2):
        pass
# 插件类
class Plugin_1(object):
    """hook实现类1"""
    @hookimpl
    def myhook(self, arg1, arg2):
        print("Plugin_1.myhook called")
        return arg1 + arg2
    @hookimpl
    def my_hook_func2(self, arg1, arg2):
        print("Plugin_1.my_hook_func2 called, args:", arg1, arg2)
    def my_hook_func3(self, arg1, arg2):
        print("Plugin_1.my_hook_func3 called, args:", arg1, arg2)
class Plugin_2(object):
    """hook实现类2"""
    @hookimpl
    def myhook(self, arg1, arg2):
        print("Plugin_2.myhook called")
        return arg1 - arg2
    @hookimpl
    def my_hook_func2(self, arg1, arg2):
        print("Plugin_2.my_hook_func2, args:", arg1, arg2)
# 初始化 PluginManager
pm = pluggy.PluginManager("myproject")
# 登记hook集合(hook函数声明)
pm.add_hookspecs(MySpec)
# 注册插件(hook函数实现)
pm.register(Plugin_1())
pm.register(Plugin_2())
# 调用自定义hook
results = pm.hook.myhook(arg1=1, arg2=2) # 调用两个插件类中的同名hook函数 # 后注册的插件中的函数会先被调用
print(results) # 输出 [-1, 3]
results = pm.hook.my_hook_func1(arg1="name", arg2="shouke")
print(results)
pm.hook.my_hook_func2(arg1="addr", arg2="sz")

运行结果

Plugin_2.myhook called
Plugin_1.myhook called
[-1, 3]
[]
Plugin_2.my_hook_func2, args: addr sz
Plugin_1.my_hook_func2 called, args: addr sz

例2 注册模块函数为插件函数

myhookspec.py， myhookimpl.py， other.py， example.py位于同一包目录下

myhookspec.py

import pluggy
hookspec = pluggy.HookspecMarker("myproject")  # hook 标签 用于标记hook
hookimpl = pluggy.HookimplMarker("myproject")  # hook 实现标签 用于标记hook的一个或多个实现
@hookspec
def global_hook_func1(arg1, arg2):
    pass

myhookimpl.py

import pluggy
from myhookspec import hookimpl
@hookimpl
def global_hook_func1(arg1, arg2):
    print("global_hook_func1 in myhookimpl.py, args:", arg1, arg2)
    return "myhookimpl.py"

other.py

from myhookspec import hookimpl
@hookimpl
def global_hook_func1(arg1, arg2):
    print("global_hook_func1 in other.py, args:", arg1, arg2)
    return "other.py"

example.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import sys
import pluggy
import myhookspec
import myhookimpl
import other
# 初始化 PluginManager
pm = pluggy.PluginManager("myproject")
# 登记hook集合
pm.add_hookspecs(myhookspec)
# 登记hook的实现
pm.register(myhookimpl) # 插件也可以是模块
pm.register(other)
print(pm.hook.global_hook_func1(arg1="name", arg2="shouke"))

example.py运行结果如下

global_hook_func1 in other.py, args: name shouke
global_hook_func1 in myhookimpl.py, args: name shouke
['other.py', 'myhookimpl.py']

例3：自定义插件类实现hook函数免@hookimpl装饰器

myhookspec.py

import pluggy
hookspec = pluggy.HookspecMarker("myproject")
@hookspec
def mytest_hook_func1(arg1, arg2):
    pass

other.py

def mytest_hook_func1(arg1, arg2):
    print("global_hook_func1 in other.py, args:", arg1, arg2)
    return "other.py"

example.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import inspect
import pluggy
import myhookspec
import other
class PytestPluginManager(pluggy.PluginManager):
    """
    插件类，实现不用@HookimplMarkerInstance装饰的函数也可以当做函数体
    """
    def parse_hookimpl_opts(self, plugin, name):
        # 规定免@hookimpl装饰的 hooks 函数总是以 mytest_打头，这样以避免访问非可读属性
        if not name.startswith("mytest_"):
            return
        method = getattr(plugin, name)
        opts = super().parse_hookimpl_opts(plugin, name)
        # 考虑hook只能为函数(consider only actual functions for hooks)
        if not inspect.isroutine(method):
            return
        # 收集未被标记的，以mytest打头的hook函数，(collect unmarked hooks as long as they have the `pytest_' prefix)
        if opts is None and name.startswith("mytest_"):
            opts = {}
        return opts
# 初始化 PluginManager
pm = PytestPluginManager("myproject")
# 登记hook集合
pm.add_hookspecs(myhookspec)
# 登记hook的实现
pm.register(other)
pm.hook.mytest_hook_func1(arg1="addr", arg2="sz")