mirror of
https://github.com/openvswitch/ovs
synced 2025-08-22 09:58:01 +00:00
991559357f
These initial bindings pass a few hundred of the corresponding tests for C implementations of various bits of the Open vSwitch library API. The poorest part of them is actually the Python IDL interface in ovs.db.idl, which has not received enough attention yet. It appears to work, but it doesn't yet support writes (transactions) and it is difficult to use. I hope to improve it as it becomes clear what semantics Python applications actually want from an IDL.
106 lines
3.5 KiB
Python
106 lines
3.5 KiB
Python
# Copyright (c) 2010 Nicira Networks
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at:
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import re
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from ovs.db import error
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class Parser(object):
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def __init__(self, json, name):
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self.name = name
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self.json = json
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if type(json) != dict:
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self.__raise_error("Object expected.")
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self.used = set()
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def __get(self, name, types, optional, default=None):
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if name in self.json:
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self.used.add(name)
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member = float_to_int(self.json[name])
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if is_identifier(member) and "id" in types:
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return member
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if len(types) and type(member) not in types:
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self.__raise_error("Type mismatch for member '%s'." % name)
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return member
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else:
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if not optional:
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self.__raise_error("Required '%s' member is missing." % name)
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return default
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def get(self, name, types):
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return self.__get(name, types, False)
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def get_optional(self, name, types, default=None):
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return self.__get(name, types, True, default)
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def __raise_error(self, message):
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raise error.Error("Parsing %s failed: %s" % (self.name, message),
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self.json)
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def finish(self):
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missing = set(self.json) - set(self.used)
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if missing:
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name = missing.pop()
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if len(missing) > 1:
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self.__raise_error("Member '%s' and %d other members "
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"are present but not allowed here"
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% (name, len(missing)))
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elif missing:
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self.__raise_error("Member '%s' and 1 other member "
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"are present but not allowed here" % name)
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else:
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self.__raise_error("Member '%s' is present but not "
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"allowed here" % name)
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def float_to_int(x):
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# XXX still needed?
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if type(x) == float:
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integer = int(x)
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if integer == x and integer >= -2**53 and integer < 2**53:
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return integer
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return x
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id_re = re.compile("[_a-zA-Z][_a-zA-Z0-9]*$")
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def is_identifier(s):
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return type(s) in [str, unicode] and id_re.match(s)
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def json_type_to_string(type):
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if type == None:
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return "null"
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elif type == bool:
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return "boolean"
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elif type == dict:
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return "object"
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elif type == list:
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return "array"
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elif type in [int, long, float]:
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return "number"
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elif type in [str, unicode]:
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return "string"
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else:
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return "<invalid>"
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def unwrap_json(json, name, need_type):
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if (type(json) != list or len(json) != 2 or json[0] != name or
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type(json[1]) != need_type):
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raise error.Error("expected [\"%s\", <%s>]"
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% (name, json_type_to_string(need_type)), json)
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return json[1]
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def parse_json_pair(json):
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if type(json) != list or len(json) != 2:
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raise error.Error("expected 2-element array", json)
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return json
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