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Last active December 15, 2015 01:39
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The decorator named 'node' takes mapping and call next wsgi apprication. The mapping's key is URL pattern you want to match, and the value is a name for a function which will be called when the key pattern matches to URL. In this example, '/a/' calls node2, '/b/' calls node3, '/' calls node1 and '/b/a/' calls node1 too.
from wsgiref.simple_server import make_server
from webob.dec import wsgify
def node(mapping):
def deco(func):
def wrapper(request):
called_count = request.environ['nodechain.chaincount']
except KeyError:
called_count = 0
node_name = request.path_info.split('/')[called_count+1] # /a/b/c => a
node = mapping.get(node_name)
if not node:
node = func
from os.path import basename, splitext
name, _ = splitext(basename(__file__))
mod = __import__(name)
if hasattr(mod, node):
node = getattr(mod, node)
node = func
request.environ['nodechain.chaincount'] += 1
except KeyError:
request.environ['nodechain.chaincount'] = 1
response = node(request)
return response
return wrapper
return deco
def node2(request):
return "OK. I'm node2"
@node({'a': 'node1', 'b': 'node2'})
def node3(request):
return "OK. I'm node3"
@node({'a': 'node2', 'b': 'node3'})
def node1(request):
return "OK. I'm node1"
if __name__ == '__main__':
httpd = make_server('', 8080, node1)
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