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Location: oxrlib-fork/oxrlib/config.py
cdc748c14f06
4.9 KiB
text/x-python
config: Fix type of path passed to cache classes.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 | import argparse
import configparser
import datetime
import decimal
import os.path
import pathlib
from . import cache, loaders
HOME_PATH = pathlib.Path(os.path.expanduser('~'))
CONFFILE_SEED = """
[Historical]
base=USD
"""
def currency_code(s):
if not ((len(s) == 3) and s.isalpha()):
raise ValueError("bad currency code: {!r}".format(s))
return s.upper()
def date_from(fmt_s):
def date_from_fmt(s):
return datetime.datetime.strptime(s, fmt_s).date()
return date_from_fmt
class Configuration:
DEFAULT_CONFIG_PATH = pathlib.Path(HOME_PATH, '.config', 'oxrlib.ini')
PREPOSITIONS = frozenset(['in', 'to', 'into'])
def __init__(self, arglist):
argparser = self._build_argparser()
self.error = argparser.error
self.args = argparser.parse_args(arglist)
if self.args.config_file is None:
self.args.config_file = [self.DEFAULT_CONFIG_PATH]
self.conffile = self._build_conffile()
conffile_paths = [path.as_posix() for path in self.args.config_file]
read_files = self.conffile.read(conffile_paths)
for expected_path, read_path in zip(conffile_paths, read_files):
if read_path != expected_path:
self.error("failed to read configuration file {!r}".format(expected_path))
try:
post_hook = getattr(self, '_post_hook_' + self.args.command)
except AttributeError:
pass
else:
post_hook()
def _build_argparser(self):
prog_parser = argparse.ArgumentParser()
prog_parser.add_argument(
'--config-file', '-c',
action='append', type=pathlib.Path,
help="Path of a configuration file to read",
)
subparsers = prog_parser.add_subparsers()
hist_parser = subparsers.add_parser('historical', aliases=['hist'])
hist_parser.set_defaults(
command='historical',
amount=None,
from_currency=None,
)
hist_parser.add_argument(
'--base',
type=currency_code,
help="Base currency (default USD)",
)
hist_parser.add_argument(
'date',
type=date_from('%Y-%m-%d'), metavar='YYYY-MM-DD',
)
hist_parser.add_argument(
'remainder',
nargs=argparse.REMAINDER,
)
return prog_parser
def _build_conffile(self):
conffile = configparser.ConfigParser()
conffile.read_string(CONFFILE_SEED)
return conffile
def _convert_or_error(self, argtype, s_value, argname=None, typename=None):
try:
return argtype(s_value)
except (decimal.InvalidOperation, TypeError, ValueError):
errmsg = []
if argname:
errmsg.append("argument {}".format(argname))
if typename is None:
typename = argtype.__name__.replace('_', ' ')
errmsg.append("invalid {} value".format(typename))
errmsg.append(repr(s_value))
self.error(': '.join(errmsg))
def _post_hook_historical(self):
if self.args.base is None:
self.args.base = self.conffile.get('Historical', 'base')
self.args.to_currency = self.args.base
remain_len = len(self.args.remainder)
if (remain_len > 3) and (self.args.remainder[2].lower() in self.PREPOSITIONS):
del self.args.remainder[2]
remain_len -= 1
if remain_len == 0:
pass
elif remain_len == 1:
self.args.from_currency = self._convert_or_error(
currency_code, self.args.remainder[0])
elif remain_len < 4:
self.args.amount = self._convert_or_error(
decimal.Decimal, self.args.remainder[0])
self.args.from_currency = self._convert_or_error(
currency_code, self.args.remainder[1])
if remain_len == 3:
self.args.to_currency = self._convert_or_error(
currency_code, self.args.remainder[2])
else:
self.error("too many arguments")
def _build_cache_loader(self):
kwargs = dict(self.conffile.items('Cache'))
try:
kwargs['dir_path'] = pathlib.Path(kwargs.pop('directory'))
except KeyError:
pass
self.cache = cache.CacheWriter(**kwargs)
return loaders.FileCache(**kwargs)
def _build_oxrapi_loader(self):
kwargs = dict(self.conffile.items('OXR'))
return loaders.OXRAPIRequest(**kwargs)
def get_loaders(self):
loader_chain = loaders.LoaderChain()
for build_func in [
self._build_cache_loader,
self._build_oxrapi_loader,
]:
try:
loader = build_func()
except (TypeError, ValueError, configparser.NoSectionError):
pass
else:
loader_chain.add_loader(loader)
return loader_chain
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