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+ "select", + "serde", + "serde_json", + "thiserror", + "time 0.3.22", +] diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..899bc98 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,15 @@ +[package] +authors = ["Claus Matzinger ", "Param Pal Singh ; + + async fn calculate(&self, series: &[f64]) -> Option { + n_window_sma(self.window_size, series) + } +} + +#[derive(Debug)] +struct MaxPrice {} + +#[async_trait] +impl AsyncStockSignal for MaxPrice { + type SignalType = f64; + + async fn calculate(&self, series: &[f64]) -> Option { + max(series) + } +} +#[derive(Debug)] +struct MinPrice {} + +#[async_trait] +impl AsyncStockSignal for MinPrice { + type SignalType = f64; + + async fn calculate(&self, series: &[f64]) -> Option { + min(series) + } +} +#[derive(Debug)] +struct PriceDifference {} + +#[async_trait] +impl AsyncStockSignal for PriceDifference { + type SignalType = (f64, f64); + + async fn calculate(&self, series: &[f64]) -> Option { + price_diff(series) + } +} + +/// +/// A trait to provide a common interface for all signal calculations. +/// +#[async_trait] +trait AsyncStockSignal { + /// + /// The signal's data type. + /// + type SignalType; + + /// + /// Calculate the signal on the provided series. + /// + /// # Returns + /// + /// The signal (using the provided type) or `None` on error/invalid data. + /// + async fn calculate(&self, series: &[f64]) -> Option; +} + +/// +/// Calculates the absolute and relative difference between the beginning and ending of an f64 series. The relative difference is relative to the beginning. +/// +/// # Returns +/// +/// A tuple `(absolute, relative)` difference. +/// +fn price_diff(a: &[f64]) -> Option<(f64, f64)> { + if !a.is_empty() { + // unwrap is safe here even if first == last + let (first, last) = (a.first().unwrap(), a.last().unwrap()); + let abs_diff = last - first; + let first = if *first == 0.0 { 1.0 } else { *first }; + let rel_diff = abs_diff / first; + Some((abs_diff, rel_diff)) + } else { + None + } +} + +/// +/// Window function to create a simple moving average +/// +fn n_window_sma(n: usize, series: &[f64]) -> Option> { + if !series.is_empty() && n > 1 { + Some( + series + .windows(n) + .map(|w| w.iter().sum::() / w.len() as f64) + .collect(), + ) + } else { + None + } +} + +/// +/// Find the maximum in a series of f64 +/// +fn max(series: &[f64]) -> Option { + if series.is_empty() { + None + } else { + Some(series.iter().fold(f64::MIN, |acc, q| acc.max(*q))) + } +} + +/// +/// Find the minimum in a series of f64 +/// +fn min(series: &[f64]) -> Option { + if series.is_empty() { + None + } else { + Some(series.iter().fold(f64::MAX, |acc, q| acc.min(*q))) + } +} + +/// +/// Retrieve data from a data source and extract the closing prices. Errors during download are mapped onto io::Errors as InvalidData. +/// +async fn fetch_closing_data( + symbol: &str, + beginning: &DateTime, + end: &DateTime, +) -> std::io::Result> { + let provider = yahoo::YahooConnector::new(); + + let response = provider + .get_quote_history( + symbol, + OffsetDateTime::from_unix_timestamp(beginning.timestamp()).unwrap(), + OffsetDateTime::from_unix_timestamp(end.timestamp()).unwrap(), + ) + .await + .map_err(|_| Error::from(ErrorKind::InvalidData))?; + let mut quotes = response + .quotes() + .map_err(|_| Error::from(ErrorKind::InvalidData))?; + if !quotes.is_empty() { + quotes.sort_by_cached_key(|k| k.timestamp); + Ok(quotes.iter().map(|q| q.adjclose as f64).collect()) + } else { + Ok(vec![]) + } +} + +#[tokio::main] +async fn main() -> std::io::Result<()> { + let opts = Opts::parse(); + let from: DateTime = opts.from.parse().expect("Couldn't parse 'from' date"); + let to = Utc::now(); + + // a simple way to output a CSV header + println!("period start,symbol,price,change %,min,max,30d avg"); + for symbol in opts.symbols.split(',') { + let closes = fetch_closing_data(&symbol, &from, &to).await?; + if !closes.is_empty() { + // min/max of the period. unwrap() because those are Option types + let period_max: f64 = max(&closes).unwrap(); + let period_min: f64 = min(&closes).unwrap(); + let last_price = *closes.last().unwrap_or(&0.0); + let (_, pct_change) = price_diff(&closes).unwrap_or((0.0, 0.0)); + let sma = n_window_sma(30, &closes).unwrap_or_default(); + + // a simple way to output CSV data + println!( + "{},{},${:.2},{:.2}%,${:.2},${:.2},${:.2}", + from.to_rfc3339(), + symbol, + last_price, + pct_change * 100.0, + period_min, + period_max, + sma.last().unwrap_or(&0.0) + ); + } + } + Ok(()) +} + +#[cfg(test)] +mod tests { + #![allow(non_snake_case)] + use tokio::join; + + use super::*; + + #[tokio::test] + async fn test_PriceDifference_calculate() { + let signal = PriceDifference {}; + assert_eq!(signal.calculate(&[]).await, None); + assert_eq!(signal.calculate(&[1.0]).await, Some((0.0, 0.0))); + assert_eq!(signal.calculate(&[1.0, 0.0]).await, Some((-1.0, -1.0))); + assert_eq!( + signal + .calculate(&[2.0, 3.0, 5.0, 6.0, 1.0, 2.0, 10.0]) + .await, + Some((8.0, 4.0)) + ); + assert_eq!( + signal.calculate(&[0.0, 3.0, 5.0, 6.0, 1.0, 2.0, 1.0]).await, + Some((1.0, 1.0)) + ); + } + + #[tokio::test] + async fn test_parallel_PriceDifference_calculate() { + let signal = PriceDifference {}; + let (empty_series, single_value_series, multiple_vals) = join!( + signal.calculate(&[]), + signal.calculate(&[1.0]), + signal.calculate(&[1.0, 0.0]) + ); + + assert_eq!(empty_series, None); + assert_eq!(single_value_series, Some((0.0, 0.0))); + assert_eq!(multiple_vals, Some((-1.0, -1.0))); + // assert_eq!( + // signal + // .calculate(&[2.0, 3.0, 5.0, 6.0, 1.0, 2.0, 10.0]) + // .await, + // Some((8.0, 4.0)) + // ); + // assert_eq!( + // signal.calculate(&[0.0, 3.0, 5.0, 6.0, 1.0, 2.0, 1.0]).await, + // Some((1.0, 1.0)) + // ); + } + + #[tokio::test] + async fn test_parallel_MinPrice_calculate() { + let signal = MinPrice {}; + let (empty_series, single_value_series, multiple_vals) = join!( + signal.calculate(&[]), + signal.calculate(&[1.0]), + signal.calculate(&[1.0, 0.0]) + ); + + assert_eq!(empty_series, None); + assert_eq!(single_value_series, Some(1.0)); + assert_eq!(multiple_vals, Some(0.0)); + // assert_eq!(signal.calculate(&[]).await, None); + // assert_eq!(signal.calculate(&[1.0]).await, Some(1.0)); + // assert_eq!(signal.calculate(&[1.0, 0.0]).await, Some(0.0)); + // assert_eq!( + // signal + // .calculate(&[2.0, 3.0, 5.0, 6.0, 1.0, 2.0, 10.0]) + // .await, + // Some(1.0) + // ); + // assert_eq!( + // signal.calculate(&[0.0, 3.0, 5.0, 6.0, 1.0, 2.0, 1.0]).await, + // Some(0.0) + // ); + } + #[tokio::test] + async fn test_MinPrice_calculate() { + let signal = MinPrice {}; + assert_eq!(signal.calculate(&[]).await, None); + assert_eq!(signal.calculate(&[1.0]).await, Some(1.0)); + assert_eq!(signal.calculate(&[1.0, 0.0]).await, Some(0.0)); + assert_eq!( + signal + .calculate(&[2.0, 3.0, 5.0, 6.0, 1.0, 2.0, 10.0]) + .await, + Some(1.0) + ); + assert_eq!( + signal.calculate(&[0.0, 3.0, 5.0, 6.0, 1.0, 2.0, 1.0]).await, + Some(0.0) + ); + } + + #[tokio::test] + async fn test_MaxPrice_calculate() { + let signal = MaxPrice {}; + assert_eq!(signal.calculate(&[]).await, None); + assert_eq!(signal.calculate(&[1.0]).await, Some(1.0)); + assert_eq!(signal.calculate(&[1.0, 0.0]).await, Some(1.0)); + assert_eq!( + signal + .calculate(&[2.0, 3.0, 5.0, 6.0, 1.0, 2.0, 10.0]) + .await, + Some(10.0) + ); + assert_eq!( + signal.calculate(&[0.0, 3.0, 5.0, 6.0, 1.0, 2.0, 1.0]).await, + Some(6.0) + ); + } + + #[tokio::test] + async fn test_WindowedSMA_calculate() { + let series = vec![2.0, 4.5, 5.3, 6.5, 4.7]; + + let signal = WindowedSMA { window_size: 3 }; + assert_eq!( + signal.calculate(&series).await, + Some(vec![3.9333333333333336, 5.433333333333334, 5.5]) + ); + + let signal = WindowedSMA { window_size: 5 }; + assert_eq!(signal.calculate(&series).await, Some(vec![4.6])); + + let signal = WindowedSMA { window_size: 10 }; + assert_eq!(signal.calculate(&series).await, Some(vec![])); + } +}