kingchenc
9b8e1346ed
* feat(family-16): add ValueArea + InitialBalance + OpeningRange Opens family #16 (Market Profile) with the three OHLCV-compatible scalar / multi-output indicators: - ValueArea(period, bin_count, value_area_pct) -> {poc, vah, val}. Rolling bin-approximation volume profile over the last `period` candles. Each candle's volume is spread uniformly across [low, high]; POC is the bin with highest cumulative volume; the value area expands symmetrically from POC and always absorbs the higher-volume neighbour next, until `value_area_pct` (default 0.70) of total volume is enclosed. Defaults (20, 50, 0.70). - InitialBalance(period) -> {high, low}. Tracks session-opening high and low over the first `period` bars, then locks. Default period = 12 (one-hour IB on 5-minute bars for US equities). Callers MUST invoke reset() at every session boundary, otherwise IB stays fixed for the lifetime of the instance. - OpeningRange(period) -> {high, low, breakout_distance}. Same lock-after-N-bars semantics as IB with a shorter default period (6 = 30 min on 5-minute bars) and a third output that tracks close - or_mid (positive above the range mid, negative below). Histogram-output Market Profile variants (Volume Profile, VPVR, Composite Profile) are deferred because they need a new histogram output API layer rather than fixed-arity scalars. Tick-data-only variants (TPO Profile, Single Print, Order Flow Delta, Cumulative Delta, Volume-Weighted Open) are out of scope because `wickra-data` does not currently expose tick / L2 data. All four bindings (Rust core, Python, Node, WASM) ship the new indicators with parity tests; benches added; fuzz target extended. Counter 71 -> 74 across 8 -> 9 families. cargo check --workspace --all-features green. * fix(family-16): cover cold paths in InitialBalance + ValueArea InitialBalance::value() public getter had no test covering the post-update Some(...) branch — extended accessors_and_metadata to call value() after one update. ValueArea single-print bar path (c.high == c.low) was unreachable in existing tests since the only single-print test used a uniform 100-price window which exits early via the span == 0 guard; added a mixed-window test that triggers the c.high <= c.low branch directly. The (None, None) arm of the expansion match was by-construction unreachable (the loop condition already requires at least one neighbour) and has been folded into an if/else.
Fuzzing Wickra
cargo-fuzz harnesses for
the parsing and stateful entry points of Wickra. Fuzzing requires a nightly
Rust toolchain.
Setup
cargo install cargo-fuzz
rustup toolchain install nightly
Targets
| Target | What it exercises |
|---|---|
csv_reader |
CandleReader over arbitrary bytes — headers, cells, BOM, binary noise. |
binance_envelope |
RawWsEnvelope deserialization from arbitrary strings. |
indicator_update |
Every scalar-input indicator (SMA / EMA / WMA / RSI / DEMA / TEMA / HMA / ROC / TRIX / SMMA / TRIMA / ZLEMA / KAMA / T3 / MOM / CMO / TSI / PMO / StochRSI / DPO / PPO / Coppock / StdDev / UlcerIndex / HistoricalVolatility / LinearRegression / LinRegSlope / LinRegAngle / VHF / ZScore / MACD / Bollinger) streamed + batched over arbitrary f64 sequences (NaN, ±inf, jumps). |
indicator_update_candle |
Every candle-input indicator (ATR, NATR, TrueRange, ChaikinVolatility, Keltner, Donchian, PSAR, SuperTrend, ChandelierExit, ChandeKrollStop, ATRTrailingStop, ADX, Aroon, AroonOscillator, Vortex, MassIndex, ChoppinessIndex, CCI, WilliamsR, AwesomeOscillator, AcceleratorOscillator, UltimateOscillator, BalanceOfPower, OBV, MFI, VWAP, RollingVWAP, VWMA, ADL, VPT, CMF, ChaikinOscillator, ForceIndex, EaseOfMovement, TypicalPrice, MedianPrice, WeightedClose, Stochastic) streamed + batched over fuzz-derived OHLCV candles. |
tick_aggregator |
TickAggregator over arbitrary (price, volume, timestamp) triples. |
Run
# From the repository root:
cargo +nightly fuzz run csv_reader
cargo +nightly fuzz run binance_envelope
cargo +nightly fuzz run indicator_update
cargo +nightly fuzz run indicator_update_candle
cargo +nightly fuzz run tick_aggregator
Each run continues until a crash is found or it is interrupted. A short time-boxed smoke run is useful in CI:
cargo +nightly fuzz run csv_reader -- -max_total_time=60
The expectation for every target is that it never panics: malformed or
adversarial input must surface as an Err, never a crash.