stock-trek 0.4.13

Stock Trek time-series analysis
Documentation 
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use crate::prelude::*;
use std::cmp::Ordering;

const BTC: &str = "BTC";
const USDT: &str = "USDT";

pub struct CostAveraging {
    key_has_capability: ScratchKey<bool>,
    key_market_exists: ScratchKey<bool>,
    key_satoshi_price: ScratchKey<f64>,
}

impl Default for CostAveraging {
    fn default() -> Self {
        Self {
            key_has_capability: ScratchKey::new_optional("HAS_CAPABILITY", false),
            key_market_exists: ScratchKey::new_optional("MARKET_EXISTS", false),
            key_satoshi_price: ScratchKey::new_required("SATOSHI_PRICE"),
        }
    }
}

#[register_strategy(default)]
impl Strategy for CostAveraging {
    fn market_calculations(&self, c: &StrategyContext) -> StockTrekResult<ScratchPad> {
        let mut scratch_pad = ScratchPad::new();
        if let Some(binance) = c.exchanges.get(&ExchangeId::Binance) {
            let is_capable = binance.has_capability(&OrderCapability::Market)?;
            scratch_pad.write(&self.key_has_capability, is_capable);
            let btc_usdt = c.symbol(BTC, USDT);
            let market_opt = binance.market_for(&btc_usdt)?;
            if let Some(market) = market_opt {
                scratch_pad.write(&self.key_market_exists, true);
                let satoshi_price = market.ticks.ticks[0].last.price / 1_000_000.0;
                scratch_pad.write(&self.key_satoshi_price, satoshi_price);
            }
        }
        Ok(scratch_pad)
    }
    fn on_action_error(&self) -> OnActionError {
        OnActionError::Halt
    }
    fn action_resolver(&self, c: &ResolverContext) -> StockTrekResult<Resolver> {
        Ok(c.resolvers.if_else(
            c.predicates.scratch_pad(&self.key_has_capability),
            c.resolvers.if_else(
                c.predicates.scratch_pad(&self.key_market_exists),
                c.resolvers.if_else(
                    c.predicates.compare(
                        c.portfolio.asset_in_exchange(
                            c.literals.exchange(ExchangeId::Binance),
                            c.literals.asset(USDT),
                        ),
                        Ordering::Greater,
                        c.scratch_pad.number(&self.key_satoshi_price),
                    ),
                    c.resolvers.action(c.actions.order_request(
                        ExchangeId::Binance,
                        OrderRequest {
                            account_type: AccountType::Spot,
                            client_order_id: None,
                            order_type: OrderType::Market,
                            quantity: 1.0 / 1_000_000.0,
                            reduce_only: false,
                            side: OrderSide::Buy,
                            symbol: Symbol::new(BTC, USDT),
                            time_in_force: TimeInForce::Fok,
                        },
                    )),
                    c.resolvers.no_op(),
                ),
                c.resolvers.no_op(),
            ),
            c.resolvers.no_op(),
        ))
    }
}