Greetings Pyloneers,
one part of the application deployment is to generate a config file.
I expect most applications to add a few setting to the .ini file and
to have a few settings like the beaker session secret that should have
a default value computed at generation time.
I looked at the PylonsInstaller and I found it rather plain and
unhelpful: it removes the Cheetah dependency but it doesn't provide a
replacement template language. Mako is the default templating
language for Pylons so I think you might be interested by this
Installer:
class MakoInstaller(Installer):
""" Exactly like ``paste.script.command.Installer`` except for
configuration file generation.
The ``.ini`` is rendered with Mako and the user is prompted for
required values. The class variables ``required_vals` and
``required_bool_vals`` are lists of value names or ``(val_name,
default)`` tuples. If ``default`` is callable, it will be called
with the ``vars`` dict to the the default; otherwise, its value is used
literally."""
# TODO: better prompts, possibly with terse prompts and added
# supper in .ask() for 'h' to generate long help.
use_cheetah = False
meta_name = "paste_deploy_config.ini_tmpl"
required_vals = []
required_bool_vals = []
def config_content(self, command, vars):
"""
Called by ``self.write_config``, this returns the text content
for the config file, given the provided variables.
This implementation reads
``Package.egg-info/paste_deploy_config.ini_tmpl`` and fills it
with the variables using Mako.
"""
# TODO: There is a lot of cleenup that can be done when the
# next paste script is out. 1: we can subclass
# .template_renderer() 2: .ask() will support NoDefault
# instead of 'none'
vals_stuff = [(val, command.challenge, NoDefault)
for val in self.required_vals]
vals_stuff += [(val, command.ask, 'none')
for val in self.required_bool_vals]
for val, prompt_f, no_default in vals_stuff:
default = no_default
if isinstance(val, tuple) or isinstance(val, list):
val, default = val
if callable(default):
default = default(vars)
if val not in vars:
if command.interactive:
vars[val] = prompt_f(val, default=default)
elif default is not no_default:
vars[val] = default
else:
msg = "Can't generate configuration: '%s' missing" % val
raise Exception(msg)
if not self.dist.has_metadata(self.meta_name):
if command.verbose:
print 'No %s found' % meta_name
return self.simple_config(vars)
tmpl = Template(self.dist.get_metadata(self.meta_name))
return copydir.careful_sub(
tmpl.render_unicode(**vars), vars, self.meta_name)
It uses Mako to expand values in the packaged template and it has a
minimal support for prompting the user for confirmation of the
defaults. Here is how I use it with Gazest:
def shahex(vars):
return sha1(str(uuid1())).hexdigest()
def getuuid(vars):
return str(uuid1())
class GazestInstaller(MakoInstaller):
required_vals = [("site_name", "A Gazest Site"),
"domain_name",
("site_base",
lambda v:"http://gazest.%s"; % v["domain_name"]),
("port", 8082),
("site_uuid", getuuid),
("site_changes_feed_uuid", getuuid),
("webmaster_email",
lambda v:"[EMAIL PROTECTED]" % v["domain_name"]),
("error_email_from",
lambda v:"[EMAIL PROTECTED]" % v["domain_name"]),
("system_email_from",
lambda v:"[EMAIL PROTECTED]" % v["domain_name"]),
("smtp_server", "localhost"),
("copyright_years", date.today().year),
"copyright_owner",
("copyright_owner_email", lambda v:v["webmaster_email"]),
("beaker_session_key", "gazest"),
("beaker_session_secret", shahex),
("authkit_cookie_secret", shahex),
("sqlalchemy_dburi", "sqlite:///%(here)s/data.db"),
]
required_bool_vals = [("use_error_mails", False),
("staging", True),
]
Is this the kind of things you'd merge into Pylons? If not, I still
think that we need something better than the current PylonsInstaller
so what features and interface do we want in the Installers that
Pylons ship with?
--
Yannick Gingras
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