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#============================================================================
# This library is free software; you can redistribute it and/or
# modify it under the terms of version 2.1 of the GNU Lesser General Public
# License as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#============================================================================
# Copyright (C) 2004, 2005 Mike Wray <mike.wray@hp.com>
#============================================================================
import types
from xen.xend import sxp
from xen.xend import PrettyPrint
from xen.xend.Args import ArgError
from xen.xend.XendError import XendError
from xen.xend.XendLogging import log
import resource
import http
import httpserver
def uri_pathlist(p):
"""Split a path into a list.
p path
return list of path elements
"""
l = []
for x in p.split('/'):
if x == '': continue
l.append(x)
return l
class SrvBase(resource.Resource):
"""Base class for services.
"""
def use_sxp(self, req):
return req.useSxp()
def get_op_method(self, op):
"""Get the method for an operation.
For operation 'foo' looks for 'op_foo'.
op operation name
returns method or None
"""
op_method_name = 'op_' + op
return getattr(self, op_method_name, None)
def perform(self, req):
"""General operation handler for posted operations.
For operation 'foo' looks for a method op_foo and calls
it with op_foo(op, req). Replies with code 500 if op_foo
is not found.
The method must return a list when req.use_sxp is true
and an HTML string otherwise (or list).
Methods may also return a ThreadRequest (for incomplete processing).
req request
"""
op = req.args.get('op')
if op is None or len(op) != 1:
req.setResponseCode(http.NOT_ACCEPTABLE, "Invalid request")
return ''
op = op[0]
op_method = self.get_op_method(op)
if op_method is None:
req.setResponseCode(http.NOT_IMPLEMENTED, "Operation not implemented: " + op)
req.setHeader("Content-Type", "text/plain")
req.write("Operation not implemented: " + op)
return ''
else:
try:
return op_method(op, req)
except Exception, exn:
req.setResponseCode(http.INTERNAL_SERVER_ERROR, "Request failed: " + op)
log.exception("Request %s failed.", op)
if req.useSxp():
return ['xend.err', str(exn)]
else:
return "<p>%s</p>" % str(exn)
def print_path(self, req):
"""Print the path with hyperlinks.
"""
req.printPath()
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