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tempest/tempest/lib/cli/output_parser.py

172 lines
4.7 KiB

# Copyright 2013 OpenStack Foundation
# All Rights Reserved.
#
# 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.
"""Collection of utilities for parsing CLI clients output."""
import re
from oslo_log import log as logging
from tempest.lib import exceptions
LOG = logging.getLogger(__name__)
delimiter_line = re.compile(r'^\+\-[\+\-]+\-\+$')
def details_multiple(output_lines, with_label=False):
"""Return list of dicts with item details from cli output tables.
If with_label is True, key '__label' is added to each items dict.
For more about 'label' see OutputParser.tables().
"""
items = []
tables_ = tables(output_lines)
for table_ in tables_:
if ('Property' not in table_['headers'] or
'Value' not in table_['headers']):
raise exceptions.InvalidStructure()
item = {}
for value in table_['values']:
item[value[0]] = value[1]
if with_label:
item['__label'] = table_['label']
items.append(item)
return items
def details(output_lines, with_label=False):
"""Return dict with details of first item (table) found in output."""
items = details_multiple(output_lines, with_label)
return items[0]
def listing(output_lines):
"""Return list of dicts with basic item info parsed from cli output."""
items = []
table_ = table(output_lines)
for row in table_['values']:
item = {}
for col_idx, col_key in enumerate(table_['headers']):
item[col_key] = row[col_idx]
items.append(item)
return items
def tables(output_lines):
"""Find all ascii-tables in output and parse them.
Return list of tables parsed from cli output as dicts.
(see OutputParser.table())
And, if found, label key (separated line preceding the table)
is added to each tables dict.
"""
tables_ = []
table_ = []
label = None
start = False
header = False
if not isinstance(output_lines, list):
output_lines = output_lines.split('\n')
for line in output_lines:
if delimiter_line.match(line):
if not start:
start = True
elif not header:
# we are after head area
header = True
else:
# table ends here
start = header = None
table_.append(line)
parsed = table(table_)
parsed['label'] = label
tables_.append(parsed)
table_ = []
label = None
continue
if start:
table_.append(line)
else:
if label is None:
label = line
else:
LOG.warning('Invalid line between tables: %s', line)
if table_:
LOG.warning('Missing end of table')
return tables_
def table(output_lines):
"""Parse single table from cli output.
Return dict with list of column names in 'headers' key and
rows in 'values' key.
"""
table_ = {'headers': [], 'values': []}
columns = None
if not isinstance(output_lines, list):
output_lines = output_lines.split('\n')
if not output_lines[-1]:
# skip last line if empty (just newline at the end)
output_lines = output_lines[:-1]
for line in output_lines:
if delimiter_line.match(line):
columns = _table_columns(line)
continue
if '|' not in line:
LOG.warning('skipping invalid table line: %s', line)
continue
row = []
for col in columns:
row.append(line[col[0]:col[1]].strip())
if table_['headers']:
table_['values'].append(row)
else:
table_['headers'] = row
return table_
def _table_columns(first_table_row):
"""Find column ranges in output line.
Return list of tuples (start,end) for each column
detected by plus (+) characters in delimiter line.
"""
positions = []
start = 1 # there is '+' at 0
while start < len(first_table_row):
end = first_table_row.find('+', start)
if end == -1:
break
positions.append((start, end))
start = end + 1
return positions