From 70ac0abe8c59e989ddd640290d133e35183e7031 Mon Sep 17 00:00:00 2001
From: sprites0 <199826320+sprites0@users.noreply.github.com>
Date: Sun, 22 Jun 2025 14:54:37 -0400
Subject: [PATCH] feat: System transaction map

---
 src/node/mod.rs       |  1 +
 src/node/spot_meta.rs | 66 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 src/node/spot_meta.rs

diff --git a/src/node/mod.rs b/src/node/mod.rs
index da5e127da..4d39eb1a7 100644
--- a/src/node/mod.rs
+++ b/src/node/mod.rs
@@ -37,6 +37,7 @@ pub mod evm;
 pub mod network;
 pub mod primitives;
 pub mod rpc;
+pub mod spot_meta;
 pub mod storage;
 pub mod types;
 
diff --git a/src/node/spot_meta.rs b/src/node/spot_meta.rs
new file mode 100644
index 000000000..71b483550
--- /dev/null
+++ b/src/node/spot_meta.rs
@@ -0,0 +1,66 @@
+use alloy_primitives::{Address, U256};
+use eyre::{Error, Result};
+use serde::{Deserialize, Serialize};
+use std::collections::BTreeMap;
+
+pub(crate) const MAINNET_CHAIN_ID: u64 = 999;
+pub(crate) const TESTNET_CHAIN_ID: u64 = 998;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+struct EvmContract {
+    address: Address,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+struct SpotToken {
+    index: u64,
+    #[serde(rename = "evmContract")]
+    evm_contract: Option<EvmContract>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SpotMeta {
+    tokens: Vec<SpotToken>,
+}
+
+#[derive(Debug, Clone)]
+pub(crate) struct SpotId {
+    pub index: u64,
+}
+
+impl SpotId {
+    pub(crate) fn to_s(&self) -> U256 {
+        let mut addr = [0u8; 32];
+        addr[12] = 0x20;
+        addr[24..32].copy_from_slice(self.index.to_be_bytes().as_ref());
+        U256::from_be_bytes(addr)
+    }
+}
+
+async fn fetch_spot_meta(chain_id: u64) -> Result<SpotMeta> {
+    let url = match chain_id {
+        MAINNET_CHAIN_ID => "https://api.hyperliquid.xyz/info",
+        TESTNET_CHAIN_ID => "https://api.hyperliquid-testnet.xyz/info",
+        _ => return Err(Error::msg("unknown chain id")),
+    };
+    let client = reqwest::Client::new();
+    let response = client
+        .post(url)
+        .json(&serde_json::json!({"type": "spotMeta"}))
+        .send()
+        .await?;
+    Ok(response.json().await?)
+}
+
+pub(crate) async fn erc20_contract_to_spot_token(
+    chain_id: u64,
+) -> Result<BTreeMap<Address, SpotId>> {
+    let meta = fetch_spot_meta(chain_id).await?;
+    let mut map = BTreeMap::new();
+    for token in &meta.tokens {
+        if let Some(evm_contract) = &token.evm_contract {
+            map.insert(evm_contract.address, SpotId { index: token.index });
+        }
+    }
+    Ok(map)
+}