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