Multiple debugging session with voltron

[HarDToBelieve]

Can we have a feature that support for multiple debugging session with voltron?

I suggest that we can choose a port randomly for Flask, and tell to voltron view client which one it needs to connect to

[eldipa]

I think that with a few modifications it can be done (please, correct me if I'm missing something):

First, the server (in the debugger) must choose a random port (tcp) or random domain (unix):

voltron/voltron/core.py

Lines 162 to 171 in 0b7a2fb

	if voltron.config.server.listen.tcp:
	run_listener('tcp', ThreadedVoltronWSGIServer, list(voltron.config.server.listen.tcp) + [self.app])
	if voltron.config.server.listen.domain and sys.platform != 'win32':
	path = os.path.expanduser(str(voltron.config.server.listen.domain))
	try:
	os.unlink(path)
	except:
	pass
	run_listener('domain', ThreadedUnixWSGIServer, [path, self.app])

We could say "if you choose a port == 0 in the configuration, voltron will pick a random one for you". Something similar for the domain like "if the domain ends in a -, voltron will add a random postfix to it".

Then we should let the user know which port/domain was chosen:

voltron/voltron/entry.py

Line 108 in 0b7a2fb

print(blessed.Terminal().bold_red("Voltron loaded."))

The client side is a little more complex.

First, we should add a parameter to the views to change the port/domain.

voltron/voltron/view.py

Lines 148 to 153 in 0b7a2fb

	def add_generic_arguments(cls, sp):
	sp.add_argument('--show-header', '-e', dest="header", action='store_true', help='show header', default=None)
	sp.add_argument('--hide-header', '-E', dest="header", action='store_false', help='hide header')
	sp.add_argument('--show-footer', '-f', dest="footer", action='store_true', help='show footer', default=None)
	sp.add_argument('--hide-footer', '-F', dest="footer", action='store_false', help='hide footer')
	sp.add_argument('--name', '-n', action='store', help='named configuration to use', default=None)

Now, the problem is that the client expects the final URL, not an IP+port or a domain:

voltron/voltron/view.py

Line 166 in 0b7a2fb

self.client = Client(url=voltron.config.view.api_url)

The simplest solution (but not human friendly) would create a parameter to change not the port/domain but the api_url and configure the client to use it.

Any thoughts? If there is interest on this I could write a PR.