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# Copyright (c) 2009, 2010, 2011, 2014, 2016 Nicira, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import functools
import re
import uuid
import ovs.db.parser
import ovs.db.types
import ovs.json
import ovs.jsonrpc
import ovs.ovsuuid
import ovs.poller
import ovs.socket_util
from ovs.db import error
class ConstraintViolation(error.Error):
def __init__(self, msg, json=None):
error.Error.__init__(self, msg, json, tag="constraint violation")
def escapeCString(src):
dst = []
for c in src:
if c in "\\\"":
dst.append("\\" + c)
elif ord(c) < 32:
if c == '\n':
dst.append('\\n')
elif c == '\r':
dst.append('\\r')
elif c == '\a':
dst.append('\\a')
elif c == '\b':
dst.append('\\b')
elif c == '\f':
dst.append('\\f')
elif c == '\t':
dst.append('\\t')
elif c == '\v':
dst.append('\\v')
else:
dst.append('\\%03o' % ord(c))
else:
dst.append(c)
return ''.join(dst)
def returnUnchanged(x):
return x
@functools.total_ordering
class Atom(object):
__slots__ = ('value', 'type')
def __init__(self, type_, value=None):
self.type = type_
if value is not None:
self.value = value
else:
self.value = type_.default_atom()
def __eq__(self, other):
if not isinstance(other, Atom) or self.type != other.type:
return NotImplemented
return True if self.value == other.value else False
def __lt__(self, other):
if not isinstance(other, Atom) or self.type != other.type:
return NotImplemented
return True if self.value < other.value else False
def __cmp__(self, other):
if not isinstance(other, Atom) or self.type != other.type:
return NotImplemented
elif self.value < other.value:
return -1
elif self.value > other.value:
return 1
else:
return 0
def __hash__(self):
return hash(self.value)
@staticmethod
def default(type_):
"""Returns the default value for the given type_, which must be an
instance of ovs.db.types.AtomicType.
The default value for each atomic type is;
- 0, for integer or real atoms.
- False, for a boolean atom.
- "", for a string atom.
- The all-zeros UUID, for a UUID atom."""
return Atom(type_)
def is_default(self):
return self == self.default(self.type)
@staticmethod
def from_json(base, json, symtab=None):
type_ = base.type
json = ovs.db.parser.float_to_int(json)
real_types = [int]
real_types.extend([float])
real_types = tuple(real_types)
if ((type_ == ovs.db.types.IntegerType
and isinstance(json, int))
or (type_ == ovs.db.types.RealType
and isinstance(json, real_types))
or (type_ == ovs.db.types.BooleanType and isinstance(json, bool))
or (type_ == ovs.db.types.StringType
and isinstance(json, str))):
atom = Atom(type_, json)
elif type_ == ovs.db.types.UuidType:
atom = Atom(type_, ovs.ovsuuid.from_json(json, symtab))
else:
raise error.Error("expected %s" % type_.to_string(), json)
atom.check_constraints(base)
return atom
@staticmethod
def from_python(base, value):
value = ovs.db.parser.float_to_int(value)
if isinstance(value, base.type.python_types):
atom = Atom(base.type, value)
else:
raise error.Error("expected %s, got %s" % (base.type, type(value)))
atom.check_constraints(base)
return atom
def check_constraints(self, base):
"""Checks whether 'atom' meets the constraints (if any) defined in
'base' and raises an ovs.db.error.Error if any constraint is violated.
'base' and 'atom' must have the same type.
Checking UUID constraints is deferred to transaction commit time, so
this function does nothing for UUID constraints."""
assert base.type == self.type
if base.enum is not None and self not in base.enum:
raise ConstraintViolation(
"%s is not one of the allowed values (%s)"
% (self.to_string(), base.enum.to_string()))
elif base.type in [ovs.db.types.IntegerType, ovs.db.types.RealType]:
if ((base.min is None or self.value >= base.min) and
(base.max is None or self.value <= base.max)):
pass
elif base.min is not None and base.max is not None:
raise ConstraintViolation(
"%s is not in the valid range %.15g to %.15g (inclusive)"
% (self.to_string(), base.min, base.max))
elif base.min is not None:
raise ConstraintViolation(
"%s is less than minimum allowed value %.15g"
% (self.to_string(), base.min))
else:
raise ConstraintViolation(
"%s is greater than maximum allowed value %.15g"
% (self.to_string(), base.max))
elif base.type == ovs.db.types.StringType:
# XXX The C version validates that the string is valid UTF-8 here.
# Do we need to do that in Python too?
s = self.value
length = len(s)
if length < base.min_length:
raise ConstraintViolation(
'"%s" length %d is less than minimum allowed length %d'
% (s, length, base.min_length))
elif length > base.max_length:
raise ConstraintViolation(
'"%s" length %d is greater than maximum allowed '
'length %d' % (s, length, base.max_length))
def to_json(self):
if self.type == ovs.db.types.UuidType:
return ovs.ovsuuid.to_json(self.value)
else:
return self.value
def cInitAtom(self, var):
if self.type == ovs.db.types.IntegerType:
return '.integer = %d' % self.value
elif self.type == ovs.db.types.RealType:
return '.real = %.15g' % self.value
elif self.type == ovs.db.types.BooleanType:
if self.value:
return '.boolean = true'
else:
return '.boolean = false'
elif self.type == ovs.db.types.StringType:
return '.s = %s' % escapeCString(self.value)
elif self.type == ovs.db.types.UuidType:
return '.uuid = %s' % ovs.ovsuuid.to_c_assignment(self.value)
def toEnglish(self, escapeLiteral=returnUnchanged):
if self.type == ovs.db.types.IntegerType:
return '%d' % self.value
elif self.type == ovs.db.types.RealType:
return '%.15g' % self.value
elif self.type == ovs.db.types.BooleanType:
if self.value:
return 'true'
else:
return 'false'
elif self.type == ovs.db.types.StringType:
return escapeLiteral(self.value)
elif self.type == ovs.db.types.UuidType:
return self.value.value
__need_quotes_re = re.compile("$|true|false|[^_a-zA-Z]|.*[^-._a-zA-Z]")
@staticmethod
def __string_needs_quotes(s):
return Atom.__need_quotes_re.match(s)
def to_string(self):
if self.type == ovs.db.types.IntegerType:
return '%d' % self.value
elif self.type == ovs.db.types.RealType:
return '%.15g' % self.value
elif self.type == ovs.db.types.BooleanType:
if self.value:
return 'true'
else:
return 'false'
elif self.type == ovs.db.types.StringType:
if Atom.__string_needs_quotes(self.value):
return ovs.json.to_string(self.value)
else:
return self.value
elif self.type == ovs.db.types.UuidType:
return str(self.value)
@staticmethod
def new(x):
if isinstance(x, int):
t = ovs.db.types.IntegerType
elif isinstance(x, float):
t = ovs.db.types.RealType
elif isinstance(x, bool):
t = ovs.db.types.BooleanType
elif isinstance(x, str):
t = ovs.db.types.StringType
elif isinstance(x, uuid):
t = ovs.db.types.UuidType
else:
raise TypeError
return Atom(t, x)
@functools.total_ordering
class Datum(object):
__slots__ = ('type', 'values')
def __init__(self, type_, values={}):
self.type = type_
self.values = values
def __eq__(self, other):
if not isinstance(other, Datum):
return NotImplemented
return True if self.values == other.values else False
def __lt__(self, other):
if not isinstance(other, Datum):
return NotImplemented
return True if self.values < other.values else False
def __cmp__(self, other):
if not isinstance(other, Datum):
return NotImplemented
elif self.values < other.values:
return -1
elif self.values > other.values:
return 1
else:
return 0
__hash__ = None
def __contains__(self, item):
return item in self.values
def copy(self):
return Datum(self.type, dict(self.values))
@staticmethod
def default(type_):
if type_.n_min == 0:
values = {}
elif type_.is_map():
values = {type_.key.default(): type_.value.default()}
else:
values = {type_.key.default(): None}
return Datum(type_, values)
def is_default(self):
return self == Datum.default(self.type)
def check_constraints(self):
"""Checks that each of the atoms in 'datum' conforms to the constraints
specified by its 'type' and raises an ovs.db.error.Error.
This function is not commonly useful because the most ordinary way to
obtain a datum is ultimately via Datum.from_json() or Atom.from_json(),
which check constraints themselves."""
for keyAtom, valueAtom in self.values.items():
keyAtom.check_constraints(self.type.key)
if valueAtom is not None:
valueAtom.check_constraints(self.type.value)
@staticmethod
def from_json(type_, json, symtab=None):
"""Parses 'json' as a datum of the type described by 'type'. If
successful, returns a new datum. On failure, raises an
ovs.db.error.Error.
Violations of constraints expressed by 'type' are treated as errors.
If 'symtab' is nonnull, then named UUIDs in 'symtab' are accepted.
Refer to RFC 7047 for information about this, and for the syntax
that this function accepts."""
is_map = type_.is_map()
if (is_map or
(isinstance(json, list) and len(json) > 0 and json[0] == "set")):
if is_map:
class_ = "map"
else:
class_ = "set"
inner = ovs.db.parser.unwrap_json(json, class_, [list, tuple],
"array")
n = len(inner)
if n < type_.n_min or n > type_.n_max:
raise error.Error("%s must have %d to %d members but %d are "
"present" % (class_, type_.n_min,
type_.n_max, n),
json)
values = {}
for element in inner:
if is_map:
key, value = ovs.db.parser.parse_json_pair(element)
keyAtom = Atom.from_json(type_.key, key, symtab)
valueAtom = Atom.from_json(type_.value, value, symtab)
else:
keyAtom = Atom.from_json(type_.key, element, symtab)
valueAtom = None
if keyAtom in values:
if is_map:
raise error.Error("map contains duplicate key")
else:
raise error.Error("set contains duplicate")
values[keyAtom] = valueAtom
return Datum(type_, values)
else:
keyAtom = Atom.from_json(type_.key, json, symtab)
return Datum(type_, {keyAtom: None})
def to_json(self):
if self.type.is_map():
return ["map", [[k.to_json(), v.to_json()]
for k, v in sorted(self.values.items())]]
elif len(self.values) == 1:
key = next(iter(self.values.keys()))
return key.to_json()
else:
return ["set", [k.to_json() for k in sorted(self.values.keys())]]
def to_string(self):
head = tail = None
if self.type.n_max > 1 or len(self.values) == 0:
if self.type.is_map():
head = "{"
tail = "}"
else:
head = "["
tail = "]"
s = []
if head:
s.append(head)
for i, key in enumerate(sorted(self.values)):
if i:
s.append(", ")
s.append(key.to_string())
if self.type.is_map():
s.append("=")
s.append(self.values[key].to_string())
if tail:
s.append(tail)
return ''.join(s)
def diff(self, datum):
if self.type.n_max > 1 or len(self.values) == 0:
for k, v in datum.values.items():
if k in self.values and v == self.values[k]:
del self.values[k]
else:
self.values[k] = v
else:
return datum
return self
def as_list(self):
if self.type.is_map():
return [[k.value, v.value] for k, v in self.values.items()]
else:
return [k.value for k in self.values.keys()]
def as_dict(self):
return dict(self.values)
def as_scalar(self):
if len(self.values) == 1:
if self.type.is_map():
k, v = next(iter(self.values.items()))
return [k.value, v.value]
else:
return next(iter(self.values.keys())).value
else:
return None
def to_python(self, uuid_to_row):
"""Returns this datum's value converted into a natural Python
representation of this datum's type, according to the following
rules:
- If the type has exactly one value and it is not a map (that is,
self.type.is_scalar() returns True), then the value is:
* An int or long, for an integer column.
* An int or long or float, for a real column.
* A bool, for a boolean column.
* A str or unicode object, for a string column.
* A uuid.UUID object, for a UUID column without a ref_table.
* An object represented the referenced row, for a UUID column with
a ref_table. (For the Idl, this object will be an ovs.db.idl.Row
object.)
If some error occurs (e.g. the database server's idea of the column
is different from the IDL's idea), then the default value for the
scalar type is used (see Atom.default()).
- Otherwise, if the type is not a map, then the value is a Python list
whose elements have the types described above.
- Otherwise, the type is a map, and the value is a Python dict that
maps from key to value, with key and value types determined as
described above.
'uuid_to_row' must be a function that takes a value and an
ovs.db.types.BaseType and translates UUIDs into row objects."""
if self.type.is_scalar():
value = uuid_to_row(self.as_scalar(), self.type.key)
if value is None:
return self.type.key.default()
else:
return value
elif self.type.is_map():
value = {}
for k, v in self.values.items():
dk = uuid_to_row(k.value, self.type.key)
dv = uuid_to_row(v.value, self.type.value)
if dk is not None and dv is not None:
value[dk] = dv
return value
else:
s = set()
for k in self.values:
dk = uuid_to_row(k.value, self.type.key)
if dk is not None:
s.add(dk)
return sorted(s)
@staticmethod
def from_python(type_, value, row_to_uuid):
"""Returns a new Datum with the given ovs.db.types.Type 'type_'. The
new datum's value is taken from 'value', which must take the form
described as a valid return value from Datum.to_python() for 'type'.
Each scalar value within 'value' is initially passed through
'row_to_uuid', which should convert objects that represent rows (if
any) into uuid.UUID objects and return other data unchanged.
Raises ovs.db.error.Error if 'value' is not in an appropriate form for
'type_'."""
d = {}
if isinstance(value, dict):
for k, v in value.items():
ka = Atom.from_python(type_.key, row_to_uuid(k))
va = Atom.from_python(type_.value, row_to_uuid(v))
d[ka] = va
elif isinstance(value, (list, set, tuple)):
for k in value:
ka = Atom.from_python(type_.key, row_to_uuid(k))
d[ka] = None
else:
ka = Atom.from_python(type_.key, row_to_uuid(value))
d[ka] = None
datum = Datum(type_, d)
datum.check_constraints()
if not datum.conforms_to_type():
raise error.Error("%d values when type requires between %d and %d"
% (len(d), type_.n_min, type_.n_max))
return datum
def __getitem__(self, key):
if not isinstance(key, Atom):
key = Atom.new(key)
if not self.type.is_map():
raise IndexError
elif key not in self.values:
raise KeyError
else:
return self.values[key].value
def get(self, key, default=None):
if not isinstance(key, Atom):
key = Atom.new(key)
if key in self.values:
return self.values[key].value
else:
return default
def __str__(self):
return self.to_string()
def conforms_to_type(self):
n = len(self.values)
return self.type.n_min <= n <= self.type.n_max
def cDeclareDatum(self, name):
n = len(self.values)
if n == 0:
return ["static struct ovsdb_datum %s = { .n = 0 };"]
s = []
if self.type.key.type == ovs.db.types.StringType:
s += ["static struct json %s_key_strings[%d] = {"
% (name, n)]
for key in sorted(self.values):
s += [' { .type = JSON_STRING, '
'.string = "%s", .count = 2 },'
% escapeCString(key.value)]
s += ["};"]
s += ["static union ovsdb_atom %s_keys[%d] = {" % (name, n)]
for i in range(n):
s += [" { .s = &%s_key_strings[%d] }," % (name, i)]
s += ["};"]
else:
s = ["static union ovsdb_atom %s_keys[%d] = {" % (name, n)]
for key in sorted(self.values):
s += [" { %s }," % key.cInitAtom(key)]
s += ["};"]
if self.type.value:
if self.type.value.type == ovs.db.types.StringType:
s += ["static struct json %s_val_strings[%d] = {"
% (name, n)]
for k, v in sorted(self.values):
s += [' { .type = JSON_STRING, '
'.string = "%s", .count = 2 },'
% escapeCString(v.value)]
s += ["};"]
s += ["static union ovsdb_atom %s_values[%d] = {" % (name, n)]
for i in range(n):
s += [" { .s = &%s_val_strings[%d] }," % (name, i)]
s += ["};"]
else:
s = ["static union ovsdb_atom %s_values[%d] = {" % (name, n)]
for k, v in sorted(self.values.items()):
s += [" { %s }," % v.cInitAtom(v)]
s += ["};"]
s += ["static struct ovsdb_datum %s = {" % name]
s += [" .n = %d," % n]
s += [" .keys = %s_keys," % name]
if self.type.value:
s += [" .values = %s_values," % name]
s += ["};"]
return s