itchcpp, a fast, drop-in backend for the pure-Python itch package
itchcpp is a native (C++) NASDAQ TotalView-ITCH 5.0 parser, order-book engine,
and analytics layer exposed to Python via pybind11. It is built to be a
drop-in, faster backend for the pure-Python
itch package (published on PyPI as
itchfeed).
The pure-Python parser unpacks every message with struct.unpack and materializes a
Python object in interpreter code, which is slow on full-day feeds. itchcpp does the
framing and field decoding in C++ (gigabytes per second) while exposing the same
public API: the same message classes (same names, same raw bytes/int
attributes), the same MessageParser semantics, the same MarketMessage helpers,
the same constants, and the same create_message factory.
Drop-in usage
The package layout mirrors itch.*, so migrating only changes the import root:
# pure-Python # native backend
from itch.parser import MessageParser from itchcpp.parser import MessageParser
from itch.messages import create_message from itchcpp.messages import create_message
from itch.indicators import MARKET_CATEGORY from itchcpp.indicators import MARKET_CATEGORY
from itchcpp.parser import MessageParser
from itchcpp.messages import AddOrderNoMPIAttributionMessage
parser = MessageParser() # or MessageParser(message_type=b"AFE") to filter types
with open("01302020.NASDAQ_ITCH50", "rb") as itch_file:
for message in parser.parse_file(itch_file):
if isinstance(message, AddOrderNoMPIAttributionMessage):
# Raw attributes are bytes/int, exactly like the pure-Python package.
print(message.stock, message.decode_price("price"), message.shares)
# decode() returns a human-readable dataclass (symbols trimmed,
# prices scaled):
print(message.decode())
parse_file takes an open binary file object (so gzip.open(path, "rb") works
too); parse_stream(raw_bytes) parses an in-memory buffer. Both return lazy
iterators, apply the message_type filter, and stop at the end-of-messages system
event (S with event_code == b"C").
What is exposed
itchcpp.messages, every message class under its exact upstream name (SystemEventMessage,StockDirectoryMessage,AddOrderNoMPIAttributionMessage,AddOrderMPIDAttribution,OrderExecutedMessage,NonCrossTradeMessage,CrossTradeMessage,NOIIMessage,MWCBDeclineLeveMessage,RetailPriceImprovementIndicator,DLCRMessage, ...); the abstract basesMarketMessage,AddOrderMessage,ModifyOrderMessage,TradeMessage(the concrete classes are registered as virtual subclasses, soisinstanceworks); themessagesregistry (dict[bytes, type]); theAllMessagesconstant; and thecreate_message(message_type, **kwargs)factory.MarketMessagehelpers on every message:decode(),decode_price(name),to_bytes(),set_timestamp(ts1, ts2),split_timestamp(),get_attributes(call_able=False), plus themessage_type,description,message_size, andprice_precisionmetadata.itchcpp.parser.MessageParser,parse_file,parse_stream,parse_messages(data, callback),get_message_type(bytes), and themessage_typefilter.itchcpp.indicators, the field code lookup tables (SYSTEM_EVENT_CODES,MARKET_CATEGORY,TRADING_STATES,ISSUE_SUB_TYPE_VALUES, ...).- Native extras (not part of the pure-Python API):
itchcpp.book(BookManager,L3Book,Bbo) for single-pass order-book reconstruction, anditchcpp.analytics(Vwap).
Install
Prebuilt wheels are published to PyPI for Linux, macOS, and Windows (CPython 3.9-3.13), so most users need no compiler:
pip install itchcpp
Build from source
Building from source needs a C++20 compiler and pybind11 (pulled in automatically as
a build dependency). The pyproject.toml lives at the repository root, so build from
there:
pip install .
This invokes scikit-build-core, which configures the CMake project with
-DITCH_BUILD_PYTHON=ON and builds the itchcpp._itchcpp extension module into the
itchcpp package. To build just the extension with CMake directly:
cmake -S . -B build -DITCH_BUILD_PYTHON=ON
cmake --build build --target itchcpp_python
Relationship to the itch (itchfeed) package
itchcpp ships as a separate package and does not replace itchfeed; it exposes the
same API under the itchcpp import root. There are two migration paths:
-
Switch the import root in your own code (
itch->itchcpp). -
Wire it as an optional backend in
itchfeed, so installed users get a transparent speedup with no code change:try: from itchcpp.parser import MessageParser # fast C++ backend from itchcpp.messages import create_message, messages except ImportError: # fall back to the pure-Python implementation from itch.parser import MessageParser from itch.messages import create_message, messages
The native message objects expose raw field values (bytes for character fields,
int for prices and quantities) just like the pure-Python classes, so existing code
that calls decode_price(...) or decode() keeps working unchanged.
1 maintainer
Metadata
1 maintainer
Release files for itchcpp 1.6.4
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| File | Size | Uploaded | Provenance | |
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