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# -*- coding: utf-8 -*-
# Copyright 2014, 2015 OpenMarket Ltd
#
# 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 argparse
import os
import yaml
import sys
from textwrap import dedent
class ConfigError(Exception):
pass
class Config(object):
@staticmethod
def parse_size(value):
if isinstance(value, int) or isinstance(value, long):
return value
sizes = {"K": 1024, "M": 1024 * 1024}
size = 1
suffix = value[-1]
if suffix in sizes:
value = value[:-1]
size = sizes[suffix]
return int(value) * size
@staticmethod
def parse_duration(value):
if isinstance(value, int) or isinstance(value, long):
return value
second = 1000
hour = 60 * 60 * second
day = 24 * hour
week = 7 * day
year = 365 * day
sizes = {"s": second, "h": hour, "d": day, "w": week, "y": year}
size = 1
suffix = value[-1]
if suffix in sizes:
value = value[:-1]
size = sizes[suffix]
return int(value) * size
@staticmethod
def abspath(file_path):
return os.path.abspath(file_path) if file_path else file_path
@classmethod
def check_file(cls, file_path, config_name):
if file_path is None:
raise ConfigError(
"Missing config for %s."
" You must specify a path for the config file. You can "
"do this with the -c or --config-path option. "
"Adding --generate-config along with --server-name "
"<server name> will generate a config file at the given path."
% (config_name,)
)
if not os.path.exists(file_path):
raise ConfigError(
"File %s config for %s doesn't exist."
" Try running again with --generate-config"
% (file_path, config_name,)
)
return cls.abspath(file_path)
@classmethod
def ensure_directory(cls, dir_path):
dir_path = cls.abspath(dir_path)
if not os.path.exists(dir_path):
os.makedirs(dir_path)
if not os.path.isdir(dir_path):
raise ConfigError(
"%s is not a directory" % (dir_path,)
)
return dir_path
@classmethod
def read_file(cls, file_path, config_name):
cls.check_file(file_path, config_name)
with open(file_path) as file_stream:
return file_stream.read()
@staticmethod
def default_path(name):
return os.path.abspath(os.path.join(os.path.curdir, name))
@staticmethod
def read_config_file(file_path):
with open(file_path) as file_stream:
return yaml.load(file_stream)
def invoke_all(self, name, *args, **kargs):
results = []
for cls in type(self).mro():
if name in cls.__dict__:
results.append(getattr(cls, name)(self, *args, **kargs))
return results
def generate_config(self, config_dir_path, server_name):
default_config = "# vim:ft=yaml\n"
default_config += "\n\n".join(dedent(conf) for conf in self.invoke_all(
"default_config", config_dir_path, server_name
))
config = yaml.load(default_config)
return default_config, config
@classmethod
def load_config(cls, description, argv, generate_section=None):
obj = cls()
config_parser = argparse.ArgumentParser(add_help=False)
config_parser.add_argument(
"-c", "--config-path",
action="append",
metavar="CONFIG_FILE",
help="Specify config file"
)
config_parser.add_argument(
"--generate-config",
action="store_true",
help="Generate a config file for the server name"
)
config_parser.add_argument(
"-H", "--server-name",
help="The server name to generate a config file for"
)
config_args, remaining_args = config_parser.parse_known_args(argv)
if not config_args.config_path:
config_parser.error(
"Must supply a config file.\nA config file can be automatically"
" generated using \"--generate-config -h SERVER_NAME"
" -c CONFIG-FILE\""
)
config_dir_path = os.path.dirname(config_args.config_path[0])
config_dir_path = os.path.abspath(config_dir_path)
if config_args.generate_config:
server_name = config_args.server_name
if not server_name:
print "Most specify a server_name to a generate config for."
sys.exit(1)
(config_path,) = config_args.config_path
if os.path.exists(config_path):
print "Config file %r already exists. Not overwriting" % (
config_args.config_path
)
sys.exit(1)
if not os.path.exists(config_dir_path):
os.makedirs(config_dir_path)
with open(config_path, "wb") as config_file:
config_bytes, config = obj.generate_config(
config_dir_path, server_name
)
obj.invoke_all("generate_files", config)
config_file.write(config_bytes)
print (
"A config file has been generated in %s for server name"
" '%s' with corresponding SSL keys and self-signed"
" certificates. Please review this file and customise it to"
" your needs."
) % (config_path, server_name)
print (
"If this server name is incorrect, you will need to regenerate"
" the SSL certificates"
)
sys.exit(0)
specified_config = {}
for config_path in config_args.config_path:
yaml_config = cls.read_config_file(config_path)
specified_config.update(yaml_config)
server_name = specified_config["server_name"]
_, config = obj.generate_config(config_dir_path, server_name)
config.pop("log_config")
config.update(specified_config)
obj.invoke_all("read_config", config)
parser = argparse.ArgumentParser(
parents=[config_parser],
description=description,
formatter_class=argparse.RawDescriptionHelpFormatter,
)
obj.invoke_all("add_arguments", parser)
args = parser.parse_args(remaining_args)
obj.invoke_all("read_arguments", args)
return obj
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