fix(anvil): specialize eth_getAccountInfo in fork mode

crates/anvil/src/eth/api.rs

@@ -766,12 +766,31 @@ impl EthApi {
     }
 
     /// Returns the account information including balance, nonce, code and storage
+    ///
+    /// Note: This isn't support by all providers
     pub async fn get_account_info(
         &self,
         address: Address,
         block_number: Option<BlockId>,
     ) -> Result<alloy_rpc_types::eth::AccountInfo> {
         node_info!("eth_getAccountInfo");
+
+        if let Some(fork) = self.get_fork() {
+            // check if the number predates the fork, if in fork mode
+            if let BlockRequest::Number(number) = self.block_request(block_number).await?
+                && fork.predates_fork(number)
+            {
+                // if this predates the fork we need to fetch balance, nonce, code individually
+                // because the provider might not support this endpoint
+                let balance = self.balance(address, Some(number.into()));
+                let code = self.get_code(address, Some(number.into()));
+                let nonce = self.get_transaction_count(address, Some(number.into()));
+                let (balance, code, nonce) = try_join!(balance, code, nonce)?;
+
+                return Ok(alloy_rpc_types::eth::AccountInfo { balance, nonce, code });
+            }
+        }
+
         let account = self.get_account(address, block_number);
         let code = self.get_code(address, block_number);
         let (account, code) = try_join!(account, code)?;