# Barter-Data
A high-performance WebSocket integration library for streaming public market data from leading cryptocurrency
exchanges - batteries included. It is:
* **Easy**: Barter-Data's simple StreamBuilder interface allows for easy & quick setup (see example below!).
* **Normalised**: Barter-Data's unified interface for consuming public WebSocket data means every Exchange returns a normalised data model.
* **Real-Time**: Barter-Data utilises real-time WebSocket integrations enabling the consumption of normalised tick-by-tick data.
* **Extensible**: Barter-Data is highly extensible, and therefore easy to contribute to with coding new integrations!
**See: [`Barter`], [`Barter-Integration`], [`Barter-Execution`] & [`Barter-Macro`]**
[![Crates.io][crates-badge]][crates-url]
[![MIT licensed][mit-badge]][mit-url]
[![Build Status][actions-badge]][actions-url]
[![Discord chat][discord-badge]][discord-url]
[crates-badge]: https://img.shields.io/crates/v/barter-data.svg
[crates-url]: https://crates.io/crates/barter-data
[mit-badge]: https://img.shields.io/badge/license-MIT-blue.svg
[mit-url]: https://gitlab.com/open-source-keir/financial-modelling/trading/barter-data-rs/-/blob/main/LICENCE
[actions-badge]: https://gitlab.com/open-source-keir/financial-modelling/trading/barter-data-rs/badges/-/blob/main/pipeline.svg
[actions-url]: https://gitlab.com/open-source-keir/financial-modelling/trading/barter-data-rs/-/commits/main
[discord-badge]: https://img.shields.io/discord/910237311332151317.svg?logo=discord&style=flat-square
[discord-url]: https://discord.gg/wE7RqhnQMV
[API Documentation] |
[Chat]
[`Barter`]: https://crates.io/crates/barter
[`Barter-Integration`]: https://crates.io/crates/barter-integration
[`Barter-Execution`]: https://crates.io/crates/barter-execution
[`Barter-Macro`]: https://crates.io/crates/barter-macro
[API Documentation]: https://docs.rs/barter-data/latest/barter_data
[Chat]: https://discord.gg/wE7RqhnQMV
## Overview
Barter-Data is a high-performance WebSocket integration library for streaming public market data from leading cryptocurrency
exchanges. It presents an easy-to-use and extensible set of interfaces that can deliver normalised exchange data in real-time.
From a user perspective, it's major component is the `StreamBuilder` structures that assists in initialising an
arbitrary number of exchange `MarketStream`s using input `Subscription`s. Simply build your dream set of
`MarketStreams` and `Barter-Data` will do the rest!
### Supported Exchange Subscriptions
| **BinanceSpot** | `BinanceSpot::default()` | Spot | PublicTrades <br> OrderBooksL1 <br> OrderBooksL2 | |
| **BinanceFuturesUsd** | `BinanceFuturesUsd::default()` | FuturePerpetual | PublicTrades <br> OrderBooksL1 <br> OrderBooksL2 |
| **Bitfinex** | `Bitfinex` | Spot | PublicTrades |
| **Coinbase** | `Coinbase` | Spot | PublicTrades |
| **GateioSpot** | `GateioSpot::default()` | Spot | PublicTrades |
| **GateioFuturesUsd** | `GateioFuturesUsd::default()` | FuturePerpetual | PublicTrades |
| **GateioFuturesBtc** | `GateioFuturesBtc::default()` | FuturePerpetual | PublicTrades |
| **Kraken** | `Kraken` | Spot | PublicTrades |
| **Okx** | `Okx` | Spot <br> FuturePerpetual | PublicTrades |
## Examples
See barter-data-rs/examples for a more comprehensive selection of examples!
### Multi Exchange Public Trades
```rust,no_run
use barter_data::exchange::gateio::spot::GateioSpot;
use barter_data::{
exchange::{
binance::{futures::BinanceFuturesUsd, spot::BinanceSpot},
coinbase::Coinbase,
okx::Okx,
},
streams::Streams,
subscription::trade::PublicTrades,
};
use barter_integration::model::InstrumentKind;
use futures::StreamExt;
#[tokio::main]
async fn main() {
// Initialise PublicTrades Streams for various exchanges
// '--> each call to StreamBuilder::subscribe() initialises a separate WebSocket connection
let streams = Streams::builder()
.subscribe([
(BinanceSpot::default(), "btc", "usdt", InstrumentKind::Spot, PublicTrades),
(BinanceSpot::default(), "eth", "usdt", InstrumentKind::Spot, PublicTrades),
])
.subscribe([
(BinanceFuturesUsd::default(), "btc", "usdt", InstrumentKind::FuturePerpetual, PublicTrades),
(BinanceFuturesUsd::default(), "eth", "usdt", InstrumentKind::FuturePerpetual, PublicTrades),
])
.subscribe([
(Coinbase, "btc", "usd", InstrumentKind::Spot, PublicTrades),
(Coinbase, "eth", "usd", InstrumentKind::Spot, PublicTrades),
])
.subscribe([
(GateioSpot::default(), "btc", "usdt", InstrumentKind::Spot, PublicTrades),
(GateioSpot::default(), "eth", "usdt", InstrumentKind::Spot, PublicTrades),
])
.subscribe([
(Okx, "btc", "usdt", InstrumentKind::Spot, PublicTrades),
(Okx, "eth", "usdt", InstrumentKind::Spot, PublicTrades),
(Okx, "btc", "usdt", InstrumentKind::FuturePerpetual, PublicTrades),
(Okx, "eth", "usdt", InstrumentKind::FuturePerpetual, PublicTrades),
])
.init()
.await
.unwrap();
// Join all exchange PublicTrades streams into a single tokio_stream::StreamMap
// Notes:
// - Use `streams.select(ExchangeId)` to interact with the individual exchange streams!
// - Use `streams.join()` to join all exchange streams into a single mpsc::UnboundedReceiver!
let mut joined_stream = streams.join_map().await;
while let Some((exchange, trade)) = joined_stream.next().await {
println!("Exchange: {exchange}, Market<PublicTrade>: {trade:?}");
}
}
```
## Getting Help
Firstly, see if the answer to your question can be found in the [API Documentation]. If the answer is not there, I'd be
happy to help via [Chat] and try answer your question via Discord.
## Contributing
Thanks in advance for helping to develop the Barter ecosystem! Please do get hesitate to get touch via the Discord
[Chat] to discuss development, new features, and the future roadmap.
### Adding A New Exchange Connector
1. Add a new `Connector` trait implementation in src/exchange/<exchange_name>.mod.rs (eg/ see exchange::okx::Okx).
2. Follow on from "Adding A New Subscription Kind For An Existing Exchange Connector" below!
### Adding A New Subscription Kind For An Existing Exchange Connector
1. Add a new `SubKind` trait implementation in src/subscription/<sub_kind_name>.rs (eg/ see subscription::trade::PublicTrades).
2. Define the `SubKind::Event` data model (eg/ see subscription::trade::PublicTrade).
3. Define the `MarketStream` type the exchange `Connector` will initialise for the new `SubKind`: <br>
ie/ `impl StreamSelector<SubKind> for <ExistingExchangeConnector> { ... }`
4. Try to compile and follow the remaining steps!
5. Add a barter-data-rs/examples/<sub_kind_name>_streams.rs example in the standard format :)
## Related Projects
In addition to the Barter-Execution crate, the Barter project also maintains:
* [`Barter`]: High-performance, extensible & modular trading components with batteries-included. Contains a
pre-built trading Engine that can serve as a live-trading or backtesting system.
* [`Barter-Integration`]: High-performance, low-level framework for composing flexible web integrations.
* [`Barter-Execution`]: High-performance WebSocket integration library for streaming public market data from leading
cryptocurrency exchanges.
* [`Barter-Macro`]: Barter ecosystem macros.
## Roadmap
* Add support for more exchanges (easy to help with!)
* Add support for more subscription kinds (easy to help with!)
## Licence
This project is licensed under the [MIT license].
[MIT license]: https://gitlab.com/open-source-keir/financial-modelling/trading/barter-data-rs/-/blob/main/LICENSE
### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in Barter-Data by you, shall be licensed as MIT, without any additional
terms or conditions.