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import inspect
import xmlrpclib
import traceback
from paste.httpexceptions import HTTPBadRequest
json = None
__all__ = ['unpack', 'unpack_xmlrpc', 'unpack_json']
def unpack(func):
argspec = FunctionArgSpec(func)
def replacement_func(self):
args, kw = argspec.unpack_args(self.path_parts, self.fields)
return func(self, *args, **kw)
replacement_func.__doc__ = func.__doc__
replacement_func.__name__ = func.__name__
return replacement_func
def unpack_xmlrpc(func):
def replacement_func(self):
assert self.environ['CONTENT_TYPE'].startswith('text/xml')
data = self.environ['wsgi.input'].read()
xmlargs, method_name = xmlrpclib.loads(data)
if method_name:
kw = {'method_name': method_name}
else:
kw = {}
self.set_header('content-type', 'text/xml; charset=UTF-8')
try:
result = func(self, *xmlargs, **kw)
except:
body = make_rpc_exception(environ, sys.exc_info())
body = xmlrpclib.dumps(
xmlrpclib.Fault(1, fault), encoding='utf-8')
else:
if not isinstance(result, tuple):
result = (result,)
body = xmlrpclib.dumps(
result, methodresponse=True, encoding='utf-8')
self.write(body)
replacement_func.__doc__ = func.__doc__
replacement_func.__name__ = func.__name__
return replacement_func
def make_rpc_exception(environ, exc_info):
config = environ['paste.config']
rpc_exception = config.get('rpc_exception', None)
if rpc_exception not in (None, 'occurred', 'exception', 'traceback'):
environ['wsgi.errors'].write(
"Bad 'rpc_exception' setting: %r\n" % rpc_exception)
rpc_exception = None
if rpc_exception is None:
if config.get('debug'):
rpc_exception = 'traceback'
else:
rpc_exception = 'exception'
if rpc_exception == 'occurred':
fault = 'unhandled exception'
elif rpc_exception == 'exception':
fault = str(e)
elif rpc_exception == 'traceback':
out = StringIO()
traceback.print_exception(*exc_info, **{'file': out})
fault = out.getvalue()
return fault
def unpack_json(func):
global json
if json is None:
import json
def replacement_func(self):
data = self.environ['wsgi.input'].read()
jsonrpc = json.jsonToObj(data)
method = jsonrpc['method']
params = jsonrpc['params']
id = jsonrpc['id']
if method:
kw = {'method_name': method}
else:
kw = {}
self.set_header('content-type', 'text/plain; charset: UTF-8')
try:
result = func(self, *params, **kw)
except:
body = make_rpc_exception(environ, sys.exc_info())
response = {
'result': None,
'error': body,
'id': id}
else:
response = {
'result': result,
'error': None,
'id': id}
self.write(json.objToJson(response))
replacement_func.__doc__ = func.__doc__
replacement_func.__name__ = func.__name__
return replacement_func
class FunctionArgSpec(object):
def __init__(self, func):
self.funcargs, self.varargs, self.varkw, self.defaults = (
inspect.getargspec(func))
self.positional = []
self.optional_pos = []
self.coersions = self.collect_coersions(self.funcargs)
while self.funcargs and self.funcargs[0].endswith('_path'):
if len(self.defaults or ()) == len(self.funcargs):
# This is an optional path segment
self.optional_pos.append(self.funcargs.pop(0))
self.defaults = self.defaults[1:]
else:
self.positional.append(self.funcargs.pop(0))
self.reqargs = []
if not self.defaults:
self.reqargs = self.funcargs
else:
self.reqargs = self.funcargs[:-len(self.defaults)]
def unpack_args(self, path_parts, fields):
args = []
kw = {}
if len(self.positional) > len(path_parts):
raise HTTPBadRequest(
"Not enough parameters on the URL (expected %i more "
"path segments)" % (len(self.positional)-len(path_parts)))
if (not self.varargs
and (len(self.positional)+len(self.optional_pos))
< len(path_parts)):
raise HTTPBadRequest(
"Too many parameters on the URL (expected %i less path "
"segments)" % (len(path_parts)-len(self.positional)
-len(self.optional_pos)))
for name, value in fields.iteritems():
if not self.varkw and name not in self.coersions:
raise HTTPBadRequest(
"Variable %r not expected" % name)
if name not in self.coersions:
kw[name] = value
continue
orig_name, coercer = self.coersions[name]
if coercer:
try:
value = coercer(value)
except (ValueError, TypeError), e:
raise HTTPBadRequest(
"Bad variable %r: %s" % (name, e))
kw[orig_name] = value
for arg in self.reqargs:
if arg not in kw:
raise HTTPBadRequest(
"Variable %r required" % arg)
return args, kw
def collect_coersions(self, funcargs):
coersions = {}
for name in funcargs:
coercer = normal
orig = name
while 1:
if name.endswith('_int'):
coercer = self.add_coercer(coercer, make_int)
name = name[:-4]
elif name.endswith('_list'):
coercer = self.add_coercer(coercer, make_list)
name = name[:-5]
elif name.endswith('_float'):
coercer = self.add_coercer(coercer, make_float)
name = name[:-6]
elif name.endswith('_req'):
coercer = self.add_coercer(coercer, make_required)
name = name[:-4]
else:
break
coersions[name] = (orig, coercer)
return coersions
def add_coercer(self, coercer, new_coercer):
if not coercer or coercer is normal:
return new_coercer
else:
def coerce(val):
return new_coercer(coercer(val))
return coerce
def make_int(v):
if isinstance(v, list):
return map(int, v)
else:
return int(v)
def make_float(v):
if isinstance(v, list):
return map(float, v)
else:
return float(v)
def make_list(v):
if isinstance(v, list):
return v
else:
return [v]
def make_required(s):
if s is None:
raise TypeError
return s
def normal(v):
if isinstance(v, list):
raise ValueError("List not expected")
return v
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