结构-在所有任务完成之前和之后在本地运行命令 [英] Fabric - Run a command locally before and after all tasks complete

问题描述

我正在尝试在结构脚本中宣布部署开始和结束.这样的感觉应该很容易，但是对于我自己的一生，我不知道该怎么做.

I'm attempting to announce deployment start and end in my fabric script. Feels like this should be easy, but for the life of me I can't figure out how to do it.

env.hosts = ['www1', 'www2', 'www3', 'www4']


def announce_start(): 
    # code to connect to irc server and announce deployment begins
    pass


def announce_finish(): 
    # code to connect to irc server and announce deployment finishes
    pass


def deploy():
    # actual deployment code here
    pass

这是我尝试过的:

如果我使部署任务包含"announce_start"和"announce_finish".它将尝试在每台服务器上运行所有这些任务.

If I make my deploy task contain 'announce_start' and 'announce_finish'. It will attempt to run all those tasks on each server.

def deploy(): 
    announce_start()
    # actual deployment code here
    announce_finish()

如果我用@hosts('localhost')装饰announce_start()和announce_end()，它会在localhost上运行它，但是仍然运行四次.每个主机一个.

If I decorate announce_start() and announce_end() with @hosts('localhost'), it runs it on localhost, but still four times. One for each host.

当我键入此命令时，我终于通过在announce_start/end上使用装饰器@hosts('localhost')和fab命令使其工作:

As I was typing this, I finally got it to work by using the decorator @hosts('localhost') on announce_start/end and the fab command:

fab announce_start deploy announce_end

但是，这似乎有些古怪.我希望所有这些都包装在一个deploy命令中.有办法吗?

But this seems a bit hacky. I'd like it all wrapped in a single deploy command. Is there a way to do this?

推荐答案

例如，您可以使用fabric.api.execute

You can use fabric.api.execute, e.g.

def announce_start(): 
    # code to connect to irc server and announce deployment begins
    pass

def announce_finish(): 
    # code to connect to irc server and announce deployment finishes
    pass

@hosts(...)
def deploy_machine1():
    pass

@hosts(...)
def deploy_machine2():
    pass

def deploy():
    announce_start()
    execute(deploy_machine1)
    execute(deploy_machine2)
    announce_finish()

然后仅调用fab deploy

and then just invoke fab deploy

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