Fix fetch remote

examples/fetch_remote.rs

@@ -14,56 +14,24 @@
 // You should have received a copy of the GNU General Public License
 // along with subxt.  If not, see <http://www.gnu.org/licenses/>.
 
-use sp_runtime::traits::BlakeTwo256;
-use subxt::{
-    ClientBuilder,
-    Config,
-};
+use subxt::ClientBuilder;
 
-#[subxt::subxt(runtime_metadata_path = "tests/integration/node_runtime.scale")]
-pub mod node_runtime {
-    #[subxt(substitute_type = "sp_core::crypto::AccountId32")]
-    use sp_core::crypto::AccountId32;
-    #[subxt(substitute_type = "primitive_types::H256")]
-    use sp_core::H256;
-    #[subxt(substitute_type = "sp_runtime::multiaddress::MultiAddress")]
-    use sp_runtime::MultiAddress;
-
-    #[subxt(substitute_type = "sp_arithmetic::per_things::Perbill")]
-    use sp_arithmetic::per_things::Perbill;
-    #[subxt(substitute_type = "sp_arithmetic::per_things::Perquintill")]
-    use sp_arithmetic::per_things::Perquintill;
-}
-
-#[derive(Clone, Debug, Eq, PartialEq)]
-pub struct KusamaRuntime;
-
-impl Config for KusamaRuntime {
-    type Index = u32;
-    type BlockNumber = u32;
-    type Hash = sp_core::H256;
-    type Hashing = BlakeTwo256;
-    type AccountId = sp_runtime::AccountId32;
-    type Address = sp_runtime::MultiAddress<Self::AccountId, u32>;
-    type Header = sp_runtime::generic::Header<Self::BlockNumber, BlakeTwo256>;
-    type Extra = subxt::extrinsic::DefaultExtra<Self>;
-    type Signature = sp_runtime::MultiSignature;
-    type Extrinsic = sp_runtime::OpaqueExtrinsic;
-    type AccountData = node_runtime::system::storage::Account;
-}
+#[subxt::subxt(runtime_metadata_path = "examples/polkadot_metadata.scale")]
+pub mod polkadot {}
 
 #[async_std::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
     env_logger::init();
 
-    let client = ClientBuilder::<KusamaRuntime>::new()
-        .set_url("wss://kusama-rpc.polkadot.io")
+    let api = ClientBuilder::new()
+        .set_url("wss://rpc.polkadot.io")
         .build()
-        .await?;
+        .await?
+        .to_runtime_api::<polkadot::RuntimeApi<polkadot::DefaultConfig>>();
 
     let block_number = 1;
 
-    let block_hash = client.block_hash(Some(block_number.into())).await?;
+    let block_hash = api.client.rpc().block_hash(Some(block_number.into())).await?;
 
     if let Some(hash) = block_hash {
         println!("Block hash for block number {}: {}", block_number, hash);