/usr/lib/python2.7/dist-packages/ovsdbapp/api.py is in python-ovsdbapp 0.9.1-0ubuntu1.
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#
# 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 abc
import contextlib
import six
@six.add_metaclass(abc.ABCMeta)
class Command(object):
"""An OVSDB command that can be executed in a transaction
:attr result: The result of executing the command in a transaction
"""
@abc.abstractmethod
def execute(self, **transaction_options):
"""Immediately execute an OVSDB command
This implicitly creates a transaction with the passed options and then
executes it, returning the value of the executed transaction
:param transaction_options: Options to pass to the transaction
"""
@six.add_metaclass(abc.ABCMeta)
class Transaction(object):
@abc.abstractmethod
def commit(self):
"""Commit the transaction to OVSDB"""
@abc.abstractmethod
def add(self, command):
"""Append an OVSDB operation to the transaction"""
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, tb):
if exc_type is None:
self.result = self.commit()
@six.add_metaclass(abc.ABCMeta)
class API(object):
def __init__(self):
self._nested_txn = None
@abc.abstractmethod
def create_transaction(self, check_error=False, log_errors=True, **kwargs):
"""Create a transaction
:param check_error: Allow the transaction to raise an exception?
:type check_error: bool
:param log_errors: Log an error if the transaction fails?
:type log_errors: bool
:returns: A new transaction
:rtype: :class:`Transaction`
"""
@contextlib.contextmanager
def transaction(self, check_error=False, log_errors=True, **kwargs):
"""Create a transaction context.
:param check_error: Allow the transaction to raise an exception?
:type check_error: bool
:param log_errors: Log an error if the transaction fails?
:type log_errors: bool
:returns: Either a new transaction or an existing one.
:rtype: :class:`Transaction`
"""
if self._nested_txn:
yield self._nested_txn
else:
with self.create_transaction(
check_error, log_errors, **kwargs) as txn:
self._nested_txn = txn
try:
yield txn
finally:
self._nested_txn = None
@abc.abstractmethod
def db_create(self, table, **col_values):
"""Create a command to create new record
:param table: The OVS table containing the record to be created
:type table: string
:param col_values: The columns and their associated values
to be set after create
:type col_values: Dictionary of columns id's and values
:returns: :class:`Command` with no result
"""
@abc.abstractmethod
def db_destroy(self, table, record):
"""Create a command to destroy a record
:param table: The OVS table containing the record to be destroyed
:type table: string
:param record: The record id (name/uuid) to be destroyed
:type record: uuid/string
:returns: :class:`Command` with no result
"""
@abc.abstractmethod
def db_set(self, table, record, *col_values):
"""Create a command to set fields in a record
:param table: The OVS table containing the record to be modified
:type table: string
:param record: The record id (name/uuid) to be modified
:type table: string
:param col_values: The columns and their associated values
:type col_values: Tuples of (column, value). Values may be atomic
values or unnested sequences/mappings
:returns: :class:`Command` with no result
"""
# TODO(twilson) Consider handling kwargs for arguments where order
# doesn't matter. Though that would break the assert_called_once_with
# unit tests
@abc.abstractmethod
def db_add(self, table, record, column, *values):
"""Create a command to add a value to a record
Adds each value or key-value pair to column in record in table. If
column is a map, then each value will be a dict, otherwise a base type.
If key already exists in a map column, then the current value is not
replaced (use the set command to replace an existing value).
:param table: The OVS table containing the record to be modified
:type table: string
:param record: The record id (name/uuid) to modified
:type record: string
:param column: The column name to be modified
:type column: string
:param values: The values to be added to the column
:type values: The base type of the column. If column is a map, then
a dict containing the key name and the map's value type
:returns: :class:`Command` with no result
"""
@abc.abstractmethod
def db_clear(self, table, record, column):
"""Create a command to clear a field's value in a record
:param table: The OVS table containing the record to be modified
:type table: string
:param record: The record id (name/uuid) to be modified
:type record: string
:param column: The column whose value should be cleared
:type column: string
:returns: :class:`Command` with no result
"""
@abc.abstractmethod
def db_get(self, table, record, column):
"""Create a command to return a field's value in a record
:param table: The OVS table containing the record to be queried
:type table: string
:param record: The record id (name/uuid) to be queried
:type record: string
:param column: The column whose value should be returned
:type column: string
:returns: :class:`Command` with the field's value result
"""
@abc.abstractmethod
def db_list(self, table, records=None, columns=None, if_exists=False):
"""Create a command to return a list of OVSDB records
:param table: The OVS table to query
:type table: string
:param records: The records to return values from
:type records: list of record ids (names/uuids)
:param columns: Limit results to only columns, None means all columns
:type columns: list of column names or None
:param if_exists: Do not fail if the record does not exist
:type if_exists: bool
:returns: :class:`Command` with [{'column', value}, ...] result
"""
@abc.abstractmethod
def db_list_rows(self, table, record=None, if_exists=False):
"""Create a command to return a list of OVSDB records
Identical to db_list, but returns a RowView list result
:returns: :class:`Command` with RowView list result
"""
@abc.abstractmethod
def db_find(self, table, *conditions, **kwargs):
"""Create a command to return find OVSDB records matching conditions
:param table: The OVS table to query
:type table: string
:param conditions:The conditions to satisfy the query
:type conditions: 3-tuples containing (column, operation, match)
Type of 'match' parameter MUST be identical to column
type
Examples:
atomic: ('tag', '=', 7)
map: ('external_ids' '=', {'iface-id': 'xxx'})
field exists?
('external_ids', '!=', {'iface-id', ''})
set contains?:
('protocols', '{>=}', 'OpenFlow13')
See the ovs-vsctl man page for more operations
:param columns: Limit results to only columns, None means all columns
:type columns: list of column names or None
:returns: :class:`Command` with [{'column', value}, ...] result
"""
@abc.abstractmethod
def db_find_rows(self, table, *conditions, **kwargs):
"""Create a command to return OVSDB records matching conditions
Identical to db_find, but returns a list of RowView objects
:returns: :class:`Command` with RowView list result
"""
@abc.abstractmethod
def db_remove(self, table, record, column, *values, **keyvalues):
"""Create a command to delete fields or key-value pairs in a record
:param table: The OVS table to query
:type table: string
:param record: The record id (name/uuid)
:type record: string
:param column: The column whose value should be deleted
:type column: string
:param values: In case of list columns, the values to be deleted
from the list of values
In case of dict columns, the keys to delete
regardless of their value
:type value: varies depending on column
:param keyvalues: For dict columns, the keys to delete when the key's
value matches the argument value
:type keyvalues: values vary depending on column
:param if_exists: Do not fail if the record does not exist
:type if_exists: bool
:returns: :class:`Command` with no result
"""
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