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utils.py
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# Copyright (C) 2015-2018 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU Affero General Public License version 3, or any later version
# See top-level LICENSE file for more information
from rest_framework.response import Response
from rest_framework.decorators import api_view
from types import GeneratorType
from swh.web.common.exc import NotFoundExc
from swh.web.api.apiurls import APIUrls, api_route
def api_lookup(lookup_fn, *args,
notfound_msg='Object not found',
enrich_fn=None):
"""
Capture a redundant behavior of:
- looking up the backend with a criteria (be it an identifier or
checksum) passed to the function lookup_fn
- if nothing is found, raise an NotFoundExc exception with error
message notfound_msg.
- Otherwise if something is returned:
- either as list, map or generator, map the enrich_fn function to
it and return the resulting data structure as list.
- either as dict and pass to enrich_fn and return the dict
enriched.
Args:
- lookup_fn: function expects one criteria and optional supplementary
\*args.
- notfound_msg: if nothing matching the criteria is found,
raise NotFoundExc with this error message.
- enrich_fn: Function to use to enrich the result returned by
lookup_fn. Default to the identity function if not provided.
- \*args: supplementary arguments to pass to lookup_fn.
Raises:
NotFoundExp or whatever `lookup_fn` raises.
"""
if enrich_fn is None:
enrich_fn = (lambda x: x)
res = lookup_fn(*args)
if not res:
raise NotFoundExc(notfound_msg)
if isinstance(res, (map, list, GeneratorType)):
return [enrich_fn(x) for x in res]
return enrich_fn(res)
@api_view(['GET', 'HEAD'])
def api_home(request):
return Response({}, template_name='api.html')
APIUrls.add_url_pattern(r'^$', api_home, view_name='api-homepage')
@api_route(r'/', 'endpoints')
def api_endpoints(request):
"""Display the list of opened api endpoints.
"""
routes = APIUrls.get_app_endpoints().copy()
for route, doc in routes.items():
doc['doc_intro'] = doc['docstring'].split('\n\n')[0]
# Return a list of routes with consistent ordering
env = {
'doc_routes': sorted(routes.items())
}
return Response(env, template_name="api-endpoints.html")

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