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fault/python-fmclient/fmclient/fmclient/common/options.py

135 lines
4.1 KiB

#
# 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.
#
#
# Copyright (c) 2018 Wind River Systems, Inc.
#
# SPDX-License-Identifier: Apache-2.0
#
import re
from six.moves import urllib
OP_LOOKUP = {'!=': 'ne',
'>=': 'ge',
'<=': 'le',
'>': 'gt',
'<': 'lt',
'=': 'eq'}
OP_LOOKUP_KEYS = '|'.join(sorted(OP_LOOKUP.keys(), key=len, reverse=True))
OP_SPLIT_RE = re.compile(r'(%s)' % OP_LOOKUP_KEYS)
DATA_TYPE_RE = re.compile(r'^(string|integer|float|datetime|boolean)(::)(.+)$')
def build_url(path, q, params=None):
"""Convert list of dicts and a list of params to query url format.
This will convert the following:
"[{field=this,op=le,value=34},
{field=that,op=eq,value=foo,type=string}],
['foo=bar','sna=fu']"
to:
"?q.field=this&q.field=that&
q.op=le&q.op=eq&
q.type=&q.type=string&
q.value=34&q.value=foo&
foo=bar&sna=fu"
"""
if q:
query_params = {'q.field': [],
'q.value': [],
'q.op': [],
'q.type': []}
for query in q:
for name in ['field', 'op', 'value', 'type']:
query_params['q.%s' % name].append(query.get(name, ''))
# Transform the dict to a sequence of two-element tuples in fixed
# order, then the encoded string will be consistent in Python 2&3.
new_qparams = sorted(query_params.items(), key=lambda x: x[0])
path += "?" + urllib.parse.urlencode(new_qparams, doseq=True)
if params:
for p in params:
path += '&%s' % p
elif params:
path += '?%s' % params[0]
for p in params[1:]:
path += '&%s' % p
return path
def cli_to_array(cli_query):
"""Convert CLI list of queries to the Python API format.
This will convert the following:
"this<=34;that=string::foo"
to
"[{field=this,op=le,value=34,type=''},
{field=that,op=eq,value=foo,type=string}]"
"""
if cli_query is None:
return None
def split_by_op(query):
"""Split a single query string to field, operator, value."""
def _value_error(message):
raise ValueError('invalid query %(query)s: missing %(message)s' %
{'query': query, 'message': message})
try:
field, operator, value = OP_SPLIT_RE.split(query, maxsplit=1)
except ValueError:
_value_error('operator')
if not len(field):
_value_error('field')
if not len(value):
_value_error('value')
return field.strip(), operator, value.strip()
def split_by_data_type(query_value):
frags = DATA_TYPE_RE.match(query_value)
# The second match is the separator. Return a list without it if
# a type identifier was found.
return frags.group(1, 3) if frags else None
opts = []
queries = cli_query.split(';')
for q in queries:
query = split_by_op(q)
opt = {}
opt['field'] = query[0]
opt['op'] = OP_LOOKUP[query[1]]
# Allow the data type of the value to be specified via <type>::<value>,
# where type can be one of integer, string, float, datetime, boolean
value_frags = split_by_data_type(query[2])
if not value_frags:
opt['value'] = query[2]
opt['type'] = ''
else:
opt['type'] = value_frags[0]
opt['value'] = value_frags[1]
opts.append(opt)
return opts