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import os
import pkg_resources
from repoze.bfg.interfaces import ITemplateRenderer
from repoze.bfg.compat import json
from repoze.bfg.settings import get_settings
from repoze.bfg.path import caller_package
from repoze.bfg.threadlocal import get_current_registry
# concrete renderer factory implementations
def json_renderer_factory(name):
def _render(value, system):
return json.dumps(value)
return _render
def string_renderer_factory(name):
def _render(value, system):
if not isinstance(value, basestring):
value = str(value)
return value
return _render
# utility functions
def template_renderer_factory(spec, impl):
reg = get_current_registry()
if os.path.isabs(spec):
# 'spec' is an absolute filename
if not os.path.exists(spec):
raise ValueError('Missing template file: %s' % spec)
renderer = reg.queryUtility(ITemplateRenderer, name=spec)
if renderer is None:
renderer = impl(spec)
reg.registerUtility(renderer, ITemplateRenderer, name=spec)
else:
# spec is a package:relpath resource spec
renderer = reg.queryUtility(ITemplateRenderer, name=spec)
if renderer is None:
# service unit tests by trying the relative path string as
# the utility name directly
renderer = reg.queryUtility(ITemplateRenderer, name=spec)
if renderer is None:
try:
package_name, filename = spec.split(':', 1)
except ValueError:
# unit test or someone passing a relative pathname
package_name = caller_package(4).__name__
filename = spec
if not pkg_resources.resource_exists(package_name, filename):
raise ValueError('Missing template resource: %s' % spec)
abspath = pkg_resources.resource_filename(package_name, filename)
renderer = impl(abspath)
if not _reload_resources():
# cache the template
reg.registerUtility(renderer, ITemplateRenderer, name=spec)
return renderer
def renderer_from_name(path):
from repoze.bfg.configuration import Configurator
reg = get_current_registry()
config = Configurator(reg)
return config.renderer_from_name(path)
def _reload_resources():
settings = get_settings()
return settings and settings.get('reload_resources')
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