feat: add bitmex client

crates/bitmex-client/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "bitmex-client"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow = "1"
+hex = "0.4"
+reqwest = { version = "0.11", features = ["json"] }
+ring = "0.16"
+serde = { version = "1", features = ["derive"] }
+serde_json = { version = "1" }
+serde_urlencoded = "0.7"
+time = { version = "0.3", features = ["serde", "serde-well-known"] }
+tokio = { version = "1", features = ["macros", "rt-multi-thread"] }
+uuid = { version = "1.1", features = ["serde"] }

crates/bitmex-client/examples/example.rs

@@ -0,0 +1,26 @@
+use bitmex_client::client::Client;
+use bitmex_client::models::ContractSymbol;
+use bitmex_client::models::Network;
+use bitmex_client::models::Side;
+
+#[tokio::main]
+async fn main() {
+    let api_key = "some_api_key";
+    let api_secret = "some_secret";
+
+    let client = Client::new(Network::Testnet).with_credentials(api_key, api_secret);
+    let _order = client
+        .create_order(
+            ContractSymbol::XbtUsd,
+            100,
+            Side::Buy,
+            Some("example".to_string()),
+        )
+        .await
+        .expect("To be able to post order");
+
+    let _positions = client
+        .positions()
+        .await
+        .expect("To be able to get positions");
+}

crates/bitmex-client/src/client.rs

@@ -0,0 +1,265 @@
+use crate::models::ContractSymbol;
+use crate::models::GetPositionRequest;
+use crate::models::Network;
+use crate::models::OrdType;
+use crate::models::Order;
+use crate::models::Position;
+use crate::models::PostOrderRequest;
+use crate::models::Request;
+use crate::models::Side;
+use anyhow::bail;
+use anyhow::Result;
+use hex::encode as hexify;
+use reqwest::Method;
+use reqwest::Response;
+use reqwest::Url;
+use reqwest::{self};
+use ring::hmac;
+use serde::de::DeserializeOwned;
+use serde::Deserialize;
+use serde::Serialize;
+use serde_json::from_str;
+use serde_json::to_string as to_jstring;
+use serde_urlencoded::to_string as to_ustring;
+use std::ops::Add;
+use std::time::Duration;
+use std::time::SystemTime;
+use std::time::UNIX_EPOCH;
+
+#[derive(Clone)]
+pub struct Client {
+    url: String,
+    credentials: Option<Credentials>,
+    client: reqwest::Client,
+}
+
+impl Client {
+    pub fn new(network: Network) -> Self {
+        Self {
+            client: reqwest::Client::new(),
+            url: network.to_url(),
+            credentials: None,
+        }
+    }
+
+    pub fn with_credentials(self, api_key: impl ToString, secret: impl ToString) -> Self {
+        Self {
+            credentials: Some(Credentials::new(api_key.to_string(), secret.to_string())),
+            ..self
+        }
+    }
+
+    pub fn is_signed_in(&self) -> bool {
+        self.credentials.is_some()
+    }
+
+    pub async fn create_order(
+        &self,
+        symbol: ContractSymbol,
+        quantity: i32,
+        side: Side,
+        text: Option<String>,
+    ) -> Result<Order> {
+        let order = self
+            .send_request(PostOrderRequest {
+                symbol,
+                side: Some(side),
+                order_qty: Some(quantity),
+                ord_type: Some(OrdType::Market),
+                text,
+            })
+            .await?;
+        Ok(order)
+    }
+
+    /// Retrieve the position information for all contract symbols.
+    pub async fn positions(&self) -> Result<Vec<Position>> {
+        let positions = self.send_request(GetPositionRequest).await?;
+        Ok(positions)
+    }
+
+    async fn send_request<R>(&self, req: R) -> Result<R::Response>
+    where
+        R: Request,
+        R::Response: DeserializeOwned,
+    {
+        let url = format!("{}{}", self.url, R::ENDPOINT);
+        let mut url = Url::parse(&url)?;
+
+        if matches!(R::METHOD, Method::GET | Method::DELETE) && R::HAS_PAYLOAD {
+            url.set_query(Some(&to_ustring(&req)?));
+        }
+
+        let body = match R::METHOD {
+            Method::PUT | Method::POST => to_jstring(&req)?,
+            _ => "".to_string(),
+        };
+
+        let mut builder = self.client.request(R::METHOD, url.clone());
+
+        if R::SIGNED {
+            let credentials = match &self.credentials {
+                None => {
+                    bail!("Bitmex client not signed in")
+                }
+                Some(credentials) => credentials,
+            };
+
+            let start = SystemTime::now();
+            let expires = start
+                .duration_since(UNIX_EPOCH)
+                .expect("Time went backwards")
+                .add(Duration::from_secs(5))
+                .as_secs();
+            let (key, signature) = credentials.signature(R::METHOD, expires, &url, &body);
+            builder = builder
+                .header("api-expires", expires)
+                .header("api-key", key)
+                .header("api-signature", signature)
+        }
+
+        let resp = builder
+            .header("content-type", "application/json")
+            .body(body)
+            .send()
+            .await?;
+
+        let response = self.handle_response(resp).await?;
+
+        Ok(response)
+    }
+
+    async fn handle_response<T: DeserializeOwned>(&self, resp: Response) -> Result<T> {
+        let status = resp.status();
+        let content = resp.text().await?;
+        if status.is_success() {
+            match from_str::<T>(&content) {
+                Ok(ret) => Ok(ret),
+                Err(e) => {
+                    bail!("Cannot deserialize '{}'. '{}'", content, e);
+                }
+            }
+        } else {
+            match from_str::<BitMEXErrorResponse>(&content) {
+                Ok(ret) => bail!("Bitmex error: {:?}", ret),
+                Err(e) => {
+                    bail!("Cannot deserialize error '{}'. '{}'", content, e);
+                }
+            }
+        }
+    }
+}
+
+#[derive(Clone, Debug)]
+struct Credentials {
+    api_key: String,
+    secret: String,
+}
+
+impl Credentials {
+    fn new(api_key: impl Into<String>, secret: impl Into<String>) -> Self {
+        Self {
+            api_key: api_key.into(),
+            secret: secret.into(),
+        }
+    }
+
+    fn signature(&self, method: Method, expires: u64, url: &Url, body: &str) -> (&str, String) {
+        // Signature: hex(HMAC_SHA256(apiSecret, verb + path + expires + data))
+        let signed_key = hmac::Key::new(hmac::HMAC_SHA256, self.secret.as_bytes());
+        let sign_message = match url.query() {
+            Some(query) => format!(
+                "{}{}?{}{}{}",
+                method.as_str(),
+                url.path(),
+                query,
+                expires,
+                body
+            ),
+            None => format!("{}{}{}{}", method.as_str(), url.path(), expires, body),
+        };
+
+        let signature = hexify(hmac::sign(&signed_key, sign_message.as_bytes()));
+        (self.api_key.as_str(), signature)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::Credentials;
+    use anyhow::Result;
+    use reqwest::Method;
+    use reqwest::Url;
+
+    #[test]
+    fn test_signature_get() -> Result<()> {
+        let tr = Credentials::new(
+            "LAqUlngMIQkIUjXMUreyu3qn",
+            "chNOOS4KvNXR_Xq4k4c9qsfoKWvnDecLATCRlcBwyKDYnWgO",
+        );
+        let (_, sig) = tr.signature(
+            Method::GET,
+            1518064236,
+            &Url::parse("http://a.com/api/v1/instrument")?,
+            "",
+        );
+        assert_eq!(
+            sig,
+            "c7682d435d0cfe87c16098df34ef2eb5a549d4c5a3c2b1f0f77b8af73423bf00"
+        );
+        Ok(())
+    }
+
+    #[test]
+    fn test_signature_get_param() -> Result<()> {
+        let tr = Credentials::new(
+            "LAqUlngMIQkIUjXMUreyu3qn",
+            "chNOOS4KvNXR_Xq4k4c9qsfoKWvnDecLATCRlcBwyKDYnWgO",
+        );
+        let (_, sig) = tr.signature(
+            Method::GET,
+            1518064237,
+            &Url::parse_with_params(
+                "http://a.com/api/v1/instrument",
+                &[("filter", r#"{"symbol": "XBTM15"}"#)],
+            )?,
+            "",
+        );
+        assert_eq!(
+            sig,
+            "e2f422547eecb5b3cb29ade2127e21b858b235b386bfa45e1c1756eb3383919f"
+        );
+        Ok(())
+    }
+
+    #[test]
+    fn test_signature_post() -> Result<()> {
+        let credentials = Credentials::new(
+            "LAqUlngMIQkIUjXMUreyu3qn",
+            "chNOOS4KvNXR_Xq4k4c9qsfoKWvnDecLATCRlcBwyKDYnWgO",
+        );
+        let (_, sig) = credentials.signature(
+            Method::POST,
+            1518064238,
+            &Url::parse("http://a.com/api/v1/order")?,
+            r#"{"symbol":"XBTM15","price":219.0,"clOrdID":"mm_bitmex_1a/oemUeQ4CAJZgP3fjHsA","orderQty":98}"#,
+        );
+        assert_eq!(
+            sig,
+            "1749cd2ccae4aa49048ae09f0b95110cee706e0944e6a14ad0b3a8cb45bd336b"
+        );
+        Ok(())
+    }
+}
+
+// The error response from bitmex;
+#[derive(Deserialize, Serialize, Debug, Clone)]
+pub(crate) struct BitMEXErrorResponse {
+    pub(crate) error: BitMEXErrorMessage,
+}
+
+#[derive(Deserialize, Serialize, Debug, Clone)]
+pub(crate) struct BitMEXErrorMessage {
+    pub(crate) message: String,
+    pub(crate) name: String,
+}

crates/bitmex-client/src/lib.rs

@@ -0,0 +1,2 @@
+pub mod client;
+pub mod models;