Core Types

The types module defines the core types used throughout HftBacktest, including orders, events, and the main Bot trait.

Order Management

Order

Represents an order in the system.

pub struct Order {
    pub qty: f64,
    pub leaves_qty: f64,
    pub exec_qty: f64,
    pub exec_price_tick: i64,
    pub price_tick: i64,
    pub tick_size: f64,
    pub exch_timestamp: i64,
    pub local_timestamp: i64,
    pub order_id: u64,
    pub q: Box<dyn AnyClone + Send>,
    pub maker: bool,
    pub order_type: OrdType,
    pub req: Status,
    pub status: Status,
    pub side: Side,
    pub time_in_force: TimeInForce,
}

Fields:

qty - Total order quantity
leaves_qty - Remaining unfilled quantity
exec_qty - Quantity filled in the last execution (only when executed)
exec_price_tick - Execution price in ticks (only when executed)
price_tick - Order price in ticks
tick_size - Tick size of the asset
exch_timestamp - Exchange processing timestamp
local_timestamp - Local send/receive timestamp
order_id - Unique order identifier
q - Queue model data (backtesting only, () in live)
maker - Whether executed as maker (only when executed)
order_type - Order type (Limit, Market)
req - Request status (New, Canceled, None)
status - Current order status
side - Buy or Sell
time_in_force - Time-in-force (GTC, GTX, FOK, IOC)

Methods:

impl Order {
    pub fn new(
        order_id: u64,
        price_tick: i64,
        tick_size: f64,
        qty: f64,
        side: Side,
        order_type: OrdType,
        time_in_force: TimeInForce,
    ) -> Self
    
    pub fn price(&self) -> f64
    pub fn exec_price(&self) -> f64
    pub fn cancellable(&self) -> bool
    pub fn active(&self) -> bool
    pub fn pending(&self) -> bool
    pub fn update(&mut self, order: &Order)
}

price() - Returns the order price (price_tick * tick_size)
exec_price() - Returns the execution price (exec_price_tick * tick_size)
cancellable() - Returns true if the order can be canceled
active() - Returns true if the order is active in the market
pending() - Returns true if the order has an ongoing request
update(order) - Updates this order with values from another order

OrderRequest

Simplified order structure for submissions in live trading.

pub struct OrderRequest {
    pub order_id: u64,
    pub price: f64,
    pub qty: f64,
    pub side: Side,
    pub time_in_force: TimeInForce,
    pub order_type: OrdType,
}

OrderId

Type alias for order identifiers.

pub type OrderId = u64;

Enumerations

Side

Represents the side of an order or trade.

pub enum Side {
    Buy = 1,
    Sell = -1,
    None = 0,
    Unsupported = 127,
}

Variants:

Buy - Buy order or trade initiated by buyer
Sell - Sell order or trade initiated by seller
None - No side specified
Unsupported - Unsupported side value from connector

Trait Implementations:

impl AsRef<f64> for Side {
    fn as_ref(&self) -> &f64  // Buy=1.0, Sell=-1.0
}

impl AsRef<str> for Side {
    fn as_ref(&self) -> &'static str  // "BUY" or "SELL"
}

Status

Order status enumeration.

pub enum Status {
    None = 0,
    New = 1,
    Expired = 2,
    Filled = 3,
    Canceled = 4,
    PartiallyFilled = 5,
    Rejected = 6,
    Replaced = 7,
    Unsupported = 255,
}

TimeInForce

Order time-in-force options.

pub enum TimeInForce {
    GTC = 0,   // Good 'Til Canceled
    GTX = 1,   // Post-only
    FOK = 2,   // Fill or Kill
    IOC = 3,   // Immediate or Cancel
    Unsupported = 255,
}

Trait Implementations:

impl AsRef<str> for TimeInForce {
    fn as_ref(&self) -> &'static str  // "GTC", "GTX", "FOK", or "IOC"
}

OrdType

Order type enumeration.

pub enum OrdType {
    Limit = 0,
    Market = 1,
    Unsupported = 255,
}

Trait Implementations:

impl AsRef<str> for OrdType {
    fn as_ref(&self) -> &'static str  // "LIMIT" or "MARKET"
}

Events

Event

Feed event data structure.

#[repr(C, align(64))]
pub struct Event {
    pub ev: u64,
    pub exch_ts: i64,
    pub local_ts: i64,
    pub px: f64,
    pub qty: f64,
    pub order_id: u64,
    pub ival: i64,
    pub fval: f64,
}

Fields:

ev - Event flags (combination of event type constants)
exch_ts - Exchange timestamp
local_ts - Local receipt timestamp
px - Price
qty - Quantity
order_id - Order ID (for Level-3 Market-By-Order feeds)
ival - Reserved for additional i64 value
fval - Reserved for additional f64 value

Methods:

impl Event {
    pub fn is(&self, event: u64) -> bool
}

is(event) - Checks if this event matches the given event type

Event Type Constants

Event flags are bit flags that can be combined:

// Event types
pub const DEPTH_EVENT: u64 = 1;
pub const TRADE_EVENT: u64 = 2;
pub const DEPTH_CLEAR_EVENT: u64 = 3;
pub const DEPTH_SNAPSHOT_EVENT: u64 = 4;
pub const DEPTH_BBO_EVENT: u64 = 5;
pub const ADD_ORDER_EVENT: u64 = 10;     // L3
pub const CANCEL_ORDER_EVENT: u64 = 11;  // L3
pub const MODIFY_ORDER_EVENT: u64 = 12;  // L3
pub const FILL_EVENT: u64 = 13;          // L3

// Side indicators
pub const BUY_EVENT: u64 = 1 << 29;
pub const SELL_EVENT: u64 = 1 << 28;

// Processor indicators
pub const EXCH_EVENT: u64 = 1 << 31;
pub const LOCAL_EVENT: u64 = 1 << 30;

Combined Event Constants:

// Local events
pub const LOCAL_BID_DEPTH_EVENT: u64 = DEPTH_EVENT | BUY_EVENT | LOCAL_EVENT;
pub const LOCAL_ASK_DEPTH_EVENT: u64 = DEPTH_EVENT | SELL_EVENT | LOCAL_EVENT;
pub const LOCAL_BUY_TRADE_EVENT: u64 = TRADE_EVENT | BUY_EVENT | LOCAL_EVENT;
pub const LOCAL_SELL_TRADE_EVENT: u64 = TRADE_EVENT | SELL_EVENT | LOCAL_EVENT;
pub const LOCAL_BID_DEPTH_CLEAR_EVENT: u64 = DEPTH_CLEAR_EVENT | BUY_EVENT | LOCAL_EVENT;
pub const LOCAL_ASK_DEPTH_CLEAR_EVENT: u64 = DEPTH_CLEAR_EVENT | SELL_EVENT | LOCAL_EVENT;
pub const LOCAL_BID_DEPTH_SNAPSHOT_EVENT: u64 = DEPTH_SNAPSHOT_EVENT | BUY_EVENT | LOCAL_EVENT;
pub const LOCAL_ASK_DEPTH_SNAPSHOT_EVENT: u64 = DEPTH_SNAPSHOT_EVENT | SELL_EVENT | LOCAL_EVENT;

// Exchange events
pub const EXCH_BID_DEPTH_EVENT: u64 = DEPTH_EVENT | BUY_EVENT | EXCH_EVENT;
pub const EXCH_ASK_DEPTH_EVENT: u64 = DEPTH_EVENT | SELL_EVENT | EXCH_EVENT;
pub const EXCH_BUY_TRADE_EVENT: u64 = TRADE_EVENT | BUY_EVENT | EXCH_EVENT;
pub const EXCH_SELL_TRADE_EVENT: u64 = TRADE_EVENT | SELL_EVENT | EXCH_EVENT;
// ... and more

Example:

use hftbacktest::types::{Event, LOCAL_BID_DEPTH_EVENT, LOCAL_ASK_DEPTH_EVENT};

fn process_event(event: &Event) {
    if event.is(LOCAL_BID_DEPTH_EVENT) {
        println!("Bid depth update: {} @ {}", event.qty, event.px);
    } else if event.is(LOCAL_ASK_DEPTH_EVENT) {
        println!("Ask depth update: {} @ {}", event.qty, event.px);
    }
}

State Management

StateValues

Provides state values for tracking bot performance.

pub struct StateValues {
    pub position: f64,
    pub balance: f64,      // Backtest only
    pub fee: f64,          // Backtest only
    pub num_trades: i64,   // Backtest only
    pub trading_volume: f64,  // Backtest only
    pub trading_value: f64,   // Backtest only
}

Note: In live trading, only position is currently populated correctly.

Bot Trait

The core trait implemented by both Backtest and LiveBot.

pub trait Bot<MD>
where
    MD: MarketDepth,
{
    type Error;

    fn current_timestamp(&self) -> i64;
    fn num_assets(&self) -> usize;
    fn position(&self, asset_no: usize) -> f64;
    fn state_values(&self, asset_no: usize) -> &StateValues;
    fn depth(&self, asset_no: usize) -> &MD;
    fn last_trades(&self, asset_no: usize) -> &[Event];
    fn clear_last_trades(&mut self, asset_no: Option<usize>);
    fn orders(&self, asset_no: usize) -> &HashMap<OrderId, Order>;
    
    fn submit_buy_order(
        &mut self,
        asset_no: usize,
        order_id: OrderId,
        price: f64,
        qty: f64,
        time_in_force: TimeInForce,
        order_type: OrdType,
        wait: bool,
    ) -> Result<ElapseResult, Self::Error>;
    
    fn submit_sell_order(
        &mut self,
        asset_no: usize,
        order_id: OrderId,
        price: f64,
        qty: f64,
        time_in_force: TimeInForce,
        order_type: OrdType,
        wait: bool,
    ) -> Result<ElapseResult, Self::Error>;
    
    fn submit_order(
        &mut self,
        asset_no: usize,
        order: OrderRequest,
        wait: bool,
    ) -> Result<ElapseResult, Self::Error>;
    
    fn modify(
        &mut self,
        asset_no: usize,
        order_id: OrderId,
        price: f64,
        qty: f64,
        wait: bool,
    ) -> Result<ElapseResult, Self::Error>;
    
    fn cancel(
        &mut self,
        asset_no: usize,
        order_id: OrderId,
        wait: bool,
    ) -> Result<ElapseResult, Self::Error>;
    
    fn clear_inactive_orders(&mut self, asset_no: Option<usize>);
    
    fn wait_order_response(
        &mut self,
        asset_no: usize,
        order_id: OrderId,
        timeout: i64,
    ) -> Result<ElapseResult, Self::Error>;
    
    fn wait_next_feed(
        &mut self,
        include_order_resp: bool,
        timeout: i64,
    ) -> Result<ElapseResult, Self::Error>;
    
    fn elapse(&mut self, duration: i64) -> Result<ElapseResult, Self::Error>;
    fn elapse_bt(&mut self, duration: i64) -> Result<ElapseResult, Self::Error>;
    fn close(&mut self) -> Result<(), Self::Error>;
    fn feed_latency(&self, asset_no: usize) -> Option<(i64, i64)>;
    fn order_latency(&self, asset_no: usize) -> Option<(i64, i64, i64)>;
}

Key Methods:

current_timestamp() - Current timestamp (backtest time or actual time)
num_assets() - Number of registered assets
position(asset_no) - Current position for the asset
state_values(asset_no) - State values (balance, fees, etc.)
depth(asset_no) - Market depth for the asset
last_trades(asset_no) - Recent market trades
orders(asset_no) - Active and recent orders
submit_buy_order(...) / submit_sell_order(...) - Submit orders
cancel(asset_no, order_id, wait) - Cancel an order
elapse(duration) - Advance time by duration
wait_next_feed(...) - Wait for next market data

ElapseResult

Result type returned by time-related methods.

pub enum ElapseResult {
    Ok,
    EndOfData,
    MarketFeed,
    OrderResponse,
}

Recorder Trait

Provides recording functionality for bot statistics.

pub trait Recorder {
    type Error;
    
    fn record<MD, I>(&mut self, hbt: &I) -> Result<(), Self::Error>
    where
        I: Bot<MD>,
        MD: MarketDepth;
}

Error Types

BuildError

Errors that can occur during builder operations.

pub enum BuildError {
    BuilderIncomplete(&'static str),
    InvalidArgument(&'static str),
    Duplicate(String, String),
    ConnectorNotFound(String),
    Error(anyhow::Error),
}

Constants

Time Constants

pub const UNTIL_END_OF_DATA: i64 = i64::MAX;

Used with elapse() to continue until the end of data.

Usage Examples

Working with Orders

use hftbacktest::types::{Order, Side, OrdType, TimeInForce, Status};

let order = Order::new(
    12345,              // order_id
    10000,              // price_tick (100.00 with tick_size 0.01)
    0.01,               // tick_size
    10.0,               // qty
    Side::Buy,
    OrdType::Limit,
    TimeInForce::GTC,
);

assert_eq!(order.price(), 100.0);
assert!(order.active());
assert!(!order.pending());

Checking Event Types

use hftbacktest::types::{
    Event,
    LOCAL_BID_DEPTH_EVENT,
    LOCAL_ASK_DEPTH_EVENT,
    LOCAL_BUY_TRADE_EVENT,
};

fn handle_event(event: &Event) {
    if event.is(LOCAL_BID_DEPTH_EVENT) {
        println!("Bid updated: {} @ {}", event.qty, event.px);
    } else if event.is(LOCAL_ASK_DEPTH_EVENT) {
        println!("Ask updated: {} @ {}", event.qty, event.px);
    } else if event.is(LOCAL_BUY_TRADE_EVENT) {
        println!("Buy trade: {} @ {}", event.qty, event.px);
    }
}

Using the Bot Trait

use hftbacktest::{
    types::{Bot, OrdType, TimeInForce},
    depth::MarketDepth,
};

fn simple_strategy<MD, B>(bot: &mut B) -> Result<(), B::Error>
where
    MD: MarketDepth,
    B: Bot<MD>,
{
    let asset_no = 0;
    let depth = bot.depth(asset_no);
    
    let mid = (depth.best_bid() + depth.best_ask()) / 2.0;
    let position = bot.position(asset_no);
    
    if position == 0.0 {
        bot.submit_buy_order(
            asset_no,
            1,
            mid - 1.0,
            10.0,
            TimeInForce::GTC,
            OrdType::Limit,
            false,
        )?;
    }
    
    bot.elapse(1_000_000_000)?; // 1 second
    Ok(())
}

Python API

Rust API

Order Management

Order

OrderRequest

OrderId

Enumerations

Side

Status

TimeInForce

OrdType

Events

Event

Event Type Constants

State Management

StateValues

Bot Trait

ElapseResult

Recorder Trait

Error Types

BuildError

Constants

Time Constants

Usage Examples

Working with Orders

Checking Event Types

Using the Bot Trait

Build docs developers (and LLMs) love

Python API

Rust API

​Order Management

​Order

​OrderRequest

​OrderId

​Enumerations

​Side

​Status

​TimeInForce

​OrdType

​Events

​Event

​Event Type Constants

​State Management

​StateValues

​Bot Trait

​ElapseResult

​Recorder Trait

​Error Types

​BuildError

​Constants

​Time Constants

​Usage Examples

​Working with Orders

​Checking Event Types

​Using the Bot Trait

Build docs developers (and LLMs) love

Order Management

Order

OrderRequest

OrderId

Enumerations

Side

Status

TimeInForce

OrdType

Events

Event

Event Type Constants

State Management

StateValues

Bot Trait

ElapseResult

Recorder Trait

Error Types

BuildError

Constants

Time Constants

Usage Examples

Working with Orders

Checking Event Types

Using the Bot Trait