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#!/usr/bin/env python
#
# Copyright (C) 2018-present MongoDB, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the Server Side Public License, version 1,
# as published by MongoDB, Inc.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# Server Side Public License for more details.
#
# You should have received a copy of the Server Side Public License
# along with this program. If not, see
# <http://www.mongodb.com/licensing/server-side-public-license>.
#
# As a special exception, the copyright holders give permission to link the
# code of portions of this program with the OpenSSL library under certain
# conditions as described in each individual source file and distribute
# linked combinations including the program with the OpenSSL library. You
# must comply with the Server Side Public License in all respects for
# all of the code used other than as permitted herein. If you modify file(s)
# with this exception, you may extend this exception to your version of the
# file(s), but you are not obligated to do so. If you do not wish to do so,
# delete this exception statement from your version. If you delete this
# exception statement from all source files in the program, then also delete
# it in the license file.
"""Generate error_codes.{h,cpp} from error_codes.err.
Format of error_codes.err:
error_code("symbol1", code1)
error_code("symbol2", code2)
...
error_class("class1", ["symbol1", "symbol2, ..."])
Usage:
python generate_error_codes.py <path to error_codes.err> <template>=<output>...
"""
usage_msg = "usage: %prog /path/to/error_codes.err <template>=<output>..."
from collections import namedtuple
from Cheetah.Template import Template
import sys
def render_template(template_path, **kw):
'''Renders the template file located at template_path, using the variables defined by kw, and
returns the result as a string'''
template = Template.compile(
file=template_path,
compilerSettings=dict(
directiveStartToken="//#",
directiveEndToken="//#",
commentStartToken="//##"
),
baseclass=dict,
useCache=False)
return str(template(**kw))
class ErrorCode:
def __init__(self, name, code, extra=None):
self.name = name
self.code = code
self.extra = extra
self.categories = []
class ErrorClass:
def __init__(self, name, codes):
self.name = name
self.codes = codes
def main(argv):
# Parse and validate argv.
if len(sys.argv) < 2:
usage("Must specify error_codes.err")
if len(sys.argv) < 3:
usage("Must specify at least one template=output pair")
template_outputs = []
for arg in sys.argv[2:]:
try:
template, output = arg.split('=', 1)
template_outputs.append((template, output))
except Exception:
usage("Error parsing template=output pair: " + arg)
# Parse and validate error_codes.err.
error_codes, error_classes = parse_error_definitions_from_file(argv[1])
check_for_conflicts(error_codes, error_classes)
# Render the templates to the output files.
for template, output in template_outputs:
text = render_template(template,
codes=error_codes,
categories=error_classes,
)
with open(output, 'wb') as outfile:
outfile.write(text)
def die(message=None):
sys.stderr.write(message or "Fatal error\n")
sys.exit(1)
def usage(message=None):
sys.stderr.write(__doc__)
die(message)
def parse_error_definitions_from_file(errors_filename):
errors_file = open(errors_filename, 'r')
errors_code = compile(errors_file.read(), errors_filename, 'exec')
error_codes = []
error_classes = []
eval(errors_code,
dict(error_code=lambda *args, **kw: error_codes.append(ErrorCode(*args, **kw)),
error_class=lambda *args: error_classes.append(ErrorClass(*args))))
error_codes.sort(key=lambda x: x.code)
return error_codes, error_classes
def check_for_conflicts(error_codes, error_classes):
failed = has_duplicate_error_codes(error_codes)
if has_duplicate_error_classes(error_classes):
failed = True
if has_missing_error_codes(error_codes, error_classes):
failed = True
if failed:
die()
def has_duplicate_error_codes(error_codes):
sorted_by_name = sorted(error_codes, key=lambda x: x.name)
sorted_by_code = sorted(error_codes, key=lambda x: x.code)
failed = False
prev = sorted_by_name[0]
for curr in sorted_by_name[1:]:
if curr.name == prev.name:
sys.stdout.write('Duplicate name %s with codes %s and %s\n'
% (curr.name, curr.code, prev.code))
failed = True
prev = curr
prev = sorted_by_code[0]
for curr in sorted_by_code[1:]:
if curr.code == prev.code:
sys.stdout.write('Duplicate code %s with names %s and %s\n'
% (curr.code, curr.name, prev.name))
failed = True
prev = curr
return failed
def has_duplicate_error_classes(error_classes):
names = sorted(ec.name for ec in error_classes)
failed = False
prev_name = names[0]
for name in names[1:]:
if prev_name == name:
sys.stdout.write('Duplicate error class name %s\n' % name)
failed = True
prev_name = name
return failed
def has_missing_error_codes(error_codes, error_classes):
code_names = dict((ec.name, ec) for ec in error_codes)
failed = False
for category in error_classes:
for name in category.codes:
try:
code_names[name].categories.append(category.name)
except KeyError:
sys.stdout.write('Undeclared error code %s in class %s\n' % (name, category.name))
failed = True
return failed
if __name__ == '__main__':
main(sys.argv)
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