fix: surface eth_getStorageAt (#124)

* feat: surface eth_getStorageAt

* add blocktag

* cargo fmt

client/src/client.rs

@@ -344,8 +344,17 @@ impl<DB: Database> Client<DB> {
         self.node.read().await.get_code(address, block).await
     }
 
-    pub async fn get_storage_at(&self, address: &Address, slot: H256) -> Result<U256> {
-        self.node.read().await.get_storage_at(address, slot).await
+    pub async fn get_storage_at(
+        &self,
+        address: &Address,
+        slot: H256,
+        block: BlockTag,
+    ) -> Result<U256> {
+        self.node
+            .read()
+            .await
+            .get_storage_at(address, slot, block)
+            .await
     }
 
     pub async fn send_raw_transaction(&self, bytes: &[u8]) -> Result<H256> {

client/src/node.rs

@@ -163,10 +163,15 @@ impl Node {
         Ok(account.code)
     }
 
-    pub async fn get_storage_at(&self, address: &Address, slot: H256) -> Result<U256> {
+    pub async fn get_storage_at(
+        &self,
+        address: &Address,
+        slot: H256,
+        block: BlockTag,
+    ) -> Result<U256> {
         self.check_head_age()?;
 
-        let payload = self.get_payload(BlockTag::Latest)?;
+        let payload = self.get_payload(block)?;
         let account = self
             .execution
             .get_account(address, Some(&[slot]), payload)

client/src/rpc.rs

@@ -94,6 +94,13 @@ trait EthRpc {
     async fn get_transaction_by_hash(&self, hash: &str) -> Result<Option<Transaction>, Error>;
     #[method(name = "getLogs")]
     async fn get_logs(&self, filter: Filter) -> Result<Vec<Log>, Error>;
+    #[method(name = "getStorageAt")]
+    async fn get_storage_at(
+        &self,
+        address: &str,
+        slot: H256,
+        block: BlockTag,
+    ) -> Result<String, Error>;
 }
 
 #[rpc(client, server, namespace = "net")]
@@ -227,6 +234,19 @@ impl EthRpcServer for RpcInner {
         let node = self.node.read().await;
         convert_err(node.get_logs(&filter).await)
     }
+
+    async fn get_storage_at(
+        &self,
+        address: &str,
+        slot: H256,
+        block: BlockTag,
+    ) -> Result<String, Error> {
+        let address = convert_err(Address::from_str(address))?;
+        let node = self.node.read().await;
+        let storage = convert_err(node.get_storage_at(&address, slot, block).await)?;
+
+        Ok(format_hex(&storage))
+    }
 }
 
 #[async_trait]