orderflow-gregorian09 0.1.3

Python ctypes binding for the Orderflow C API

Orderflow Python Binding (orderflow-gregorian09)

Production-oriented Python wrapper over the stable Orderflow C ABI (of_ffi_c) for orderflow analytics, signal generation, and health-aware ingestion pipelines.

System View

What You Get

• Runtime lifecycle control (start, stop, context-manager with Engine(...))
• Symbol stream subscriptions with optional callback listeners
• Poll-based processing plus push-style external ingest (ingest_trade, ingest_book)
• Snapshot retrieval (book, analytics, signal, metrics)
• External feed supervision (stale, sequence, reconnect) via health APIs

Install

pip install orderflow-gregorian09

The Python wheel wraps the C ABI; it expects a compatible libof_ffi_c shared library at runtime.

Native Library Resolution

Lookup order:

1. Explicit library_path= argument on Engine(...)
2. ORDERFLOW_LIBRARY_PATH environment variable
3. Local debug build default (target/debug/libof_ffi_c.*)

export ORDERFLOW_LIBRARY_PATH=/absolute/path/to/libof_ffi_c.so

Minimal Usage

from orderflow import DataQualityFlags, Engine, EngineConfig, Symbol, StreamKind

with Engine(EngineConfig(instance_id="py-client")) as eng:
    sym = Symbol("CME", "ESM6", depth_levels=10)
    eng.subscribe(sym, StreamKind.ANALYTICS)
    eng.poll_once(DataQualityFlags.NONE)
    print("analytics", eng.analytics_snapshot(sym))
    print("metrics", eng.metrics_json())

External Feed Ingest Workflow

from orderflow import (
    BookAction,
    DataQualityFlags,
    Engine,
    EngineConfig,
    ExternalFeedPolicy,
    Side,
    Symbol,
    StreamKind,
)

sym = Symbol("CME", "ESM6", depth_levels=10)

with Engine(EngineConfig(instance_id="ext-feed")) as eng:
    eng.subscribe(sym, StreamKind.HEALTH, callback=lambda ev: print("health", ev))
    eng.configure_external_feed(
        ExternalFeedPolicy(stale_after_ms=2_000, enforce_sequence=True)
    )

    eng.ingest_book(
        sym, side=Side.BID, level=0, price=504900, size=20, action=BookAction.UPSERT
    )
    eng.ingest_trade(sym, price=505000, size=7, aggressor_side=Side.ASK)
    eng.poll_once(DataQualityFlags.NONE)
    print("signal", eng.signal_snapshot(sym))

API Surface

• Engine: lifecycle, subscribe/unsubscribe, poll, ingest, snapshots
• EngineConfig: runtime, persistence, audit, and retention settings
• Symbol: venue + symbol + depth descriptor
• ExternalFeedPolicy: stale and sequence policy for external data
• constants: StreamKind, Side, BookAction, DataQualityFlags

Operations Notes

• subscribe(..., callback=None) is supported for polling-only flows.
• StreamKind.HEALTH emits transition-oriented health payloads.
• reset_symbol_session(symbol) clears per-session analytics/profile state.
• external_health_tick() re-evaluates stale/degraded status without ingest.

Learn More

• Handbook: https://github.com/gregorian-09/orderflow/tree/main/docs/handbook
• API reference: https://github.com/gregorian-09/orderflow/tree/main/docs/api
• Binding docs: https://github.com/gregorian-09/orderflow/tree/main/docs/bindings
• Changelog: https://github.com/gregorian-09/orderflow/blob/main/CHANGELOG.md