python - 如何将自定义装饰器添加到结构任务

Question

好吧，我必须承认我是 fabric 甚至 python 的新手，但我有兴趣以正确的方式进行操作，所以...我想用 prepare 装饰我的一些任务> 函数根据已经给出的变量将一些变量添加到 env 中。看看:

from fabric.api import *
import fabstork.project.base as base
import fabstork.utils.drupal as utils

def prepare(task):
    """ Decorator to set some additional environment variables """
    def prepared(*args, **kwargs):
        env.sites_folder = env.sites_folder if 'sites_folder' in env else 'default'
        env.settings_file = "%s/www/sites/%s/settings.php" % (env.build_path, env.sites_folder)
        # more to come
        return task(*args, **kwargs)

    return prepared


@task
@prepare
def push(ref='HEAD'):
    """
    Deploy a commit to a host
    """
    base.push(ref)
    utils.settings_php()
    utils.link_files()
    utils.set_perms()

上面的例子失败了，因为 push 不再是任务，当在命令行执行 fab --list 时它不在可用任务列表中。省略装饰器会导致一个完美的任务。我究竟做错了什么？

Answer 1

from fabric.decorators import task
from functools import wraps

def custom_decorator(func):
    @wraps(func)
    def decorated(*args, **kwargs):
        print "this function is decorated."
        return func(*args, **kwargs)
    return decorated

@task
@custom_decorator
def some_function():
    print "this is function"

结果:

# fab -l
>Available commands:
>
>    some_function

# fab some_function
>this function is decorated.
>this is function
>
>Done.