Python?pluggy框架使用示例代碼
代碼為例進行說明
實踐環(huán)境
Python 3.6.5
pluggy 0.13.0
例1 注冊類函數(shù)為插件函數(shù)
#!/usr/bin/env python # -*- coding:utf-8 -*- import pluggy hookspec = pluggy.HookspecMarker("myproject") # hook 標簽 用于標記hook hookimpl = pluggy.HookimplMarker("myproject") # hook 實現(xiàn)標簽 用于標記hook的一個或多個實現(xiàn) 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 # 插件類 class Plugin_1(object): """hook實現(xiàn)類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實現(xiàn)類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") # 登記hook集合(hook函數(shù)聲明) pm.add_hookspecs(MySpec) # 注冊插件(hook函數(shù)實現(xiàn)) pm.register(Plugin_1()) pm.register(Plugin_2()) # 調(diào)用自定義hook results = pm.hook.myhook(arg1=1, arg2=2) # 調(diào)用兩個插件類中的同名hook函數(shù) # 后注冊的插件中的函數(shù)會先被調(diào)用 print(results) # 輸出 [-1, 3] results = pm.hook.my_hook_func1(arg1="name", arg2="shouke") print(results) pm.hook.my_hook_func2(arg1="addr", arg2="sz")
運行結(jié)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 注冊模塊函數(shù)為插件函數(shù)
myhookspec.py
, myhookimpl.py
, other.py
, example.py
位于同一包目錄下
myhookspec.py
import pluggy hookspec = pluggy.HookspecMarker("myproject") # hook 標簽 用于標記hook hookimpl = pluggy.HookimplMarker("myproject") # hook 實現(xiàn)標簽 用于標記hook的一個或多個實現(xiàn) @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") # 登記hook集合 pm.add_hookspecs(myhookspec) # 登記hook的實現(xiàn) pm.register(myhookimpl) # 插件也可以是模塊 pm.register(other) print(pm.hook.global_hook_func1(arg1="name", arg2="shouke"))
example.py運行結(jié)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:自定義插件類實現(xiàn)hook函數(shù)免@hookimpl裝飾器
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): """ 插件類,實現(xiàn)不用@HookimplMarkerInstance裝飾的函數(shù)也可以當做函數(shù)體 """ def parse_hookimpl_opts(self, plugin, name): # 規(guī)定免@hookimpl裝飾的 hooks 函數(shù)總是以 mytest_打頭,這樣以避免訪問非可讀屬性 if not name.startswith("mytest_"): return method = getattr(plugin, name) opts = super().parse_hookimpl_opts(plugin, name) # 考慮hook只能為函數(shù)(consider only actual functions for hooks) if not inspect.isroutine(method): return # 收集未被標記的,以mytest打頭的hook函數(shù),(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") # 登記hook集合 pm.add_hookspecs(myhookspec) # 登記hook的實現(xiàn) pm.register(other) pm.hook.mytest_hook_func1(arg1="addr", arg2="sz")
參考連接
https://pypi.org/project/pluggy/
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