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299 lines (245 loc) · 9.75 KB
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import base64
import inspect
import json
import re
import zlib
from contextlib import contextmanager
from datetime import datetime
from enum import Enum
import mt940
from .models import Holding
def mt940_to_array(data):
data = data.replace("@@", "\r\n")
data = data.replace("-0000", "+0000")
transactions = mt940.models.Transactions()
return transactions.parse(data)
def classproperty(f):
class fx:
def __init__(self, getter):
self.getter = getter
def __get__(self, obj, type=None):
return self.getter(type)
return fx(f)
def compress_datablob(magic: bytes, version: int, data: dict):
data = dict(data)
for k, v in data.items():
if k.endswith("_bin"):
if v:
data[k] = base64.b64encode(v).decode("us-ascii")
serialized = json.dumps(data).encode('utf-8')
compressed = zlib.compress(serialized, 9)
return b';'.join([magic, b'1', str(version).encode('us-ascii'), compressed])
def decompress_datablob(magic: bytes, blob: bytes, obj: object = None):
if not blob.startswith(magic):
raise ValueError("Incorrect data blob")
s = blob.split(b';', 3)
if len(s) != 4:
raise ValueError("Incorrect data blob")
if not s[1].isdigit() or not s[2].isdigit():
raise ValueError("Incorrect data blob")
encoding_version = int(s[1].decode('us-ascii'), 10)
blob_version = int(s[2].decode('us-ascii'), 10)
if encoding_version != 1:
raise ValueError("Unsupported encoding version {}".format(encoding_version))
decompressed = zlib.decompress(s[3])
data = json.loads(decompressed.decode('utf-8'))
for k, v in data.items():
if k.endswith("_bin"):
if v:
data[k] = base64.b64decode(v.encode('us-ascii'))
if obj:
setfunc = getattr(obj, "_set_data_v{}".format(blob_version), None)
if not setfunc:
raise ValueError("Unknown data blob version")
setfunc(data)
else:
return blob_version, data
class SubclassesMixin:
@classmethod
def _all_subclasses(cls):
for subcls in cls.__subclasses__():
yield from subcls._all_subclasses()
yield cls
class DocTypeMixin:
_DOC_TYPE = None
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
type_ = self._DOC_TYPE
if type_ is None:
if isinstance(getattr(self, 'type', None), type):
type_ = getattr(self, 'type')
if type_ is not None:
if not self.__doc__:
self.__doc__ = ""
name = type_.__name__
if type_.__module__ != 'builtins':
name = "{}.{}".format(type_.__module__, name)
self.__doc__ = self.__doc__ + "\n\n:type: :class:`{}`".format(name)
class FieldRenderFormatStringMixin:
_FORMAT_STRING = None
def _render_value(self, value):
retval = self._FORMAT_STRING.format(value)
self._check_value_length(retval)
return retval
class FixedLengthMixin:
_FIXED_LENGTH = [None, None, None]
_DOC_TYPE = str
def __init__(self, *args, **kwargs):
for i, a in enumerate(('length', 'min_length', 'max_length')):
kwargs[a] = self._FIXED_LENGTH[i] if len(self._FIXED_LENGTH) > i else None
super().__init__(*args, **kwargs)
class ShortReprMixin:
def __repr__(self):
return "{}{}({})".format(
"{}.".format(self.__class__.__module__),
self.__class__.__name__,
", ".join(
("{!r}".format(value) if not name.startswith("_") else "{}={!r}".format(name, value))
for (name, value) in self._repr_items
)
)
def print_nested(self, stream=None, level=0, indent=" ", prefix="", first_level_indent=True, trailer="", print_doc=True, first_line_suffix=""):
stream.write(
( (prefix + level*indent) if first_level_indent else "")
+ "{!r}{}{}\n".format(self, trailer, first_line_suffix)
)
class MT535_Miniparser:
re_identification = re.compile(r"^:35B:ISIN\s(.*)\|(.*)\|(.*)$")
re_marketprice = re.compile(r"^:90B::MRKT\/\/ACTU\/([A-Z]{3})(\d*),{1}(\d*)$")
re_pricedate = re.compile(r"^:98A::PRIC\/\/(\d*)$")
re_pieces = re.compile(r"^:93B::AGGR\/\/UNIT\/(\d*),(\d*)$")
re_totalvalue = re.compile(r"^:19A::HOLD\/\/([A-Z]{3})(\d*),{1}(\d*)$")
re_acquisitionprice = re.compile(r"^:70E::HOLD\/\/\d*STK\|2(\d*?),{1}(\d*?)\+([A-Z]{3})$")
def parse(self, lines):
retval = []
# First: Collapse multiline clauses into one clause
clauses = self.collapse_multilines(lines)
# Second: Scan sequence of clauses for financial instrument
# sections
finsegs = self.grab_financial_instrument_segments(clauses)
# Third: Extract financial instrument data
for finseg in finsegs:
isin, name, market_price, price_symbol, price_date, pieces, acquisitionprice = (None,)*7
for clause in finseg:
# identification of instrument
# e.g. ':35B:ISIN LU0635178014|/DE/ETF127|COMS.-MSCI EM.M.T.U.ETF I'
m = self.re_identification.match(clause)
if m:
isin = m.group(1)
name = m.group(3)
# current market price
# e.g. ':90B::MRKT//ACTU/EUR38,82'
m = self.re_marketprice.match(clause)
if m:
price_symbol = m.group(1)
market_price = float(m.group(2) + "." + m.group(3))
# date of market price
# e.g. ':98A::PRIC//20170428'
m = self.re_pricedate.match(clause)
if m:
price_date = datetime.strptime(m.group(1), "%Y%m%d").date()
# number of pieces
# e.g. ':93B::AGGR//UNIT/16,8211'
m = self.re_pieces.match(clause)
if m:
pieces = float(m.group(1) + "." + m.group(2))
# total value of holding
# e.g. ':19A::HOLD//EUR970,17'
m = self.re_totalvalue.match(clause)
if m:
total_value = float(m.group(2) + "." + m.group(3))
# Acquisition price
# e.g ':70E::HOLD//1STK23,968293+EUR'
m = self.re_acquisitionprice.match(clause)
if m:
acquisitionprice = float(m.group(1) + '.' + m.group(2))
# processed all clauses
retval.append(
Holding(
ISIN=isin, name=name, market_value=market_price,
value_symbol=price_symbol, valuation_date=price_date,
pieces=pieces, total_value=total_value,
acquisitionprice=acquisitionprice))
return retval
def collapse_multilines(self, lines):
clauses = []
prevline = ""
for line in lines:
if line.startswith(":"):
if prevline != "":
clauses.append(prevline)
prevline = line
elif line.startswith("-"):
# last line
clauses.append(prevline)
clauses.append(line)
else:
prevline += "|{}".format(line)
return clauses
def grab_financial_instrument_segments(self, clauses):
retval = []
stack = []
within_financial_instrument = False
for clause in clauses:
if clause.startswith(":16R:FIN"):
# start of financial instrument
within_financial_instrument = True
elif clause.startswith(":16S:FIN"):
# end of financial instrument - move stack over to
# return value
retval.append(stack)
stack = []
within_financial_instrument = False
else:
if within_financial_instrument:
stack.append(clause)
return retval
class Password(str):
protected = False
def __init__(self, value):
self.value = value
self.blocked = False
@classmethod
@contextmanager
def protect(cls):
try:
cls.protected = True
yield None
finally:
cls.protected = False
def block(self):
self.blocked = True
def __str__(self):
if self.blocked and not self.protected:
raise Exception("Refusing to use PIN after block")
return '***' if self.protected else str(self.value)
def __repr__(self):
return self.__str__().__repr__()
def __add__(self, other):
return self.__str__().__add__(other)
def replace(self, *args, **kwargs):
return self.__str__().replace(*args, **kwargs)
class RepresentableEnum(Enum):
def __init__(self, *args, **kwargs):
Enum.__init__(self)
# Hack alert: Try to parse the docstring from the enum source, if available. Fail softly.
# FIXME Needs test
try:
val_1 = val_2 = repr(args[0])
if val_1.startswith("'"):
val_2 = '"' + val_1[1:-1] + '"'
elif val_1.startswith('"'):
val_2 = "'" + val_1[1:-1] + "'"
regex = re.compile(r"^.*?\S+\s*=\s*(?:(?:{})|(?:{}))\s*#:\s*(\S.*)$".format(
re.escape(val_1), re.escape(val_2)))
for line in inspect.getsourcelines(self.__class__)[0]:
m = regex.match(line)
if m:
self.__doc__ = m.group(1).strip()
break
except:
raise
def __repr__(self):
return "{}.{}.{}".format(self.__class__.__module__, self.__class__.__name__, self.name)
def __str__(self):
return self.value