#!/usr/bin/env python
#
# 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 glob
import os
import sys
from xml.dom import minidom
from xml.sax.saxutils import escape
#Swift configuration example files live in
# swift/etc/*.conf-sample
# and contain sections enclosed in [], with
# options one per line containing =
# and generally only having a single entry
# after the equals (the default value)
def parse_line(line):
"""
takes a line from a swift sample configuration file and attempts
to separate the lines with actual configuration option and default
value from the rest. Returns None if the line doesn't appear to
contain a valid configuration option = default value pair, and
a pair of the config and its default if it does.
"""
if '=' not in line:
return None
temp_line = line.strip('#').strip()
config, default = temp_line.split('=', 1)
config = config.strip()
if ' ' in config and config[0:3] != 'set':
if len(default.split()) > 1 or config[0].isupper():
return None
if len(config) < 2 or '.' in config or '<' in config or '>' in config:
return None
return config, default.strip()
def get_existing_options(optfiles):
"""
parses an existing XML table to compile a list of existing options
"""
options = {}
for optfile in optfiles:
xmldoc = minidom.parse(optfile)
tbody = xmldoc.getElementsByTagName('tbody')[0]
trlist = tbody.getElementsByTagName('tr')
for tr in trlist:
try:
optentry = tr.childNodes[1].childNodes[0]
option, default = optentry.nodeValue.split('=', 1)
helptext = tr.childNodes[2].childNodes[0].nodeValue
except IndexError:
continue
if option not in options or 'No help text' in options[option]:
#options[option.split('=',1)[0]] = helptext
options[option] = helptext
return options
def extract_descriptions_from_devref(repo, options):
"""
loop through the devref RST files, looking for lines formatted
such that they might contain a description of a particular
option
"""
option_descs = {}
rsts = glob.glob(repo + '/doc/source/*.rst')
for rst in rsts:
rst_file = open(rst, 'r')
in_option_block = False
prev_option = None
for line in rst_file:
if 'Option ' in line:
in_option_block = True
if in_option_block:
if '========' in line:
in_option_block = False
continue
if line[0] == ' ' and prev_option is not None:
option_descs[prev_option] = (option_descs[prev_option]
+ ' ' + line.strip())
for option in options:
line_parts = line.strip().split(None, 2)
if (' ' in line and
len(line_parts) == 3 and
option == line_parts[0] and
line_parts[1] != '=' and
option != 'use' and
(option not in option_descs or
len(option_descs[option]) < len(line_parts[2]))):
option_descs[option] = line_parts[2]
prev_option = option
return option_descs
def new_section_file(sample, current_section):
section_filename = ('swift-' +
path.basename(sample).split('.conf')[0]
+ '-'
+ current_section.replace('[', '').
replace(']', '').replace(':', '-')
+ '.xml')
section_file = open(section_filename, 'w')
section_file.write('<?xml version="1.0" encoding="UTF-8"?>\n\
<!-- The tool that generated this table lives in the\n\
tools directory of this repository. As it was a one-time\n\
generation, you can edit this file. -->\n\
<para xmlns="http://docbook.org/ns/docbook" version="5.0">\n\
<table rules="all">\n\
<caption>Description of configuration options for <literal>'
+ current_section + '</literal> in <literal>'
+ path.basename(sample) +
'</literal></caption>\n\
<col width="50%"/>\n\
<col width="50%"/>\n\
<thead>\n\
<tr>\n\
<td>Configuration option=Default value</td>\n\
<td>Description</td>\n\
</tr>\n\
</thead>\n\
<tbody>')
return section_file
def create_new_tables(repo, verbose):
"""
writes a set of docbook-formatted tables, one per section in swift
configuration files. Uses existing tables and swift devref as a source
of truth in that order to determine helptext for options found in
sample config files
"""
existing_tables = glob.glob('../../doc/common/tables/swift*xml')
options = {}
#use the existing tables to get a list of option names
options = get_existing_options(existing_tables)
option_descs = extract_descriptions_from_devref(repo, options)
conf_samples = glob.glob(repo + '/etc/*conf-sample')
for sample in conf_samples:
current_section = None
section_file = None
sample_file = open(sample, 'r')
for line in sample_file:
if '[' in line and ']\n' in line and '=' not in line:
"""
it's a header line in the conf file, open a new table file
for this section and close any existing one
"""
if current_section != line.strip('#').strip():
if section_file is not None:
section_file.write('\n </tbody>\n\
</table>\n\
</para>')
section_file.close()
current_section = line.strip('#').strip()
section_file = new_section_file(sample, current_section)
elif section_file is not None:
"""
it's a config option line in the conf file, find out the
help text and write to the table file.
"""
parsed_line = parse_line(line)
if parsed_line is not None:
if (parsed_line[0] in options.keys()
and 'No help text' not in options[parsed_line[0]]):
# use the help text from existing tables
option_desc = options[parsed_line[0]].replace(u'\xa0',
u' ')
elif parsed_line[0] in option_descs:
# use the help text from the devref
option_desc = option_descs[parsed_line[0]].replace(
u'\xa0', u' ')
else:
option_desc = 'No help text available for this option'
if verbose > 0:
print parsed_line[0] + "has no help text"
section_file.write('\n <tr>\n\
<td>' + parsed_line[0] + '=' +
escape(str(parsed_line[1])) +
'</td><td>' + option_desc + '</td>\n' +
' </tr>')
if section_file is not None:
section_file.write('\n </tbody>\n\
</table>\n\
</para>')
section_file.close()
def main(repo, verbose=0):
"""
writes a set of docbook-formatted files, based on configuration sections
in swift sample configuration files
"""
create_new_tables(repo, verbose)
if __name__ == "__main__":
main(sys.argv[1])