Split subxt (#102)

* Proc macro improvements.

* Use proc-macros.

* Update examples.

* Fix build.

* Run rustfmt.

* Fix total issuance test.

* Remove gas limit from put code call.

* Handle runtime errors.

* Fix tests.

* Make test more reliable.

* Revert "Handle runtime errors."

This reverts commit 26f30a9f4cfcfddfb3e49308cded46cfe6468697.

* Use expect instead of unwrap.

* Parse marker type.

* Fetch doesn't fail.

src/rpc.rs

@@ -19,13 +19,16 @@
 // Related: https://github.com/paritytech/substrate-subxt/issues/66
 #![allow(irrefutable_let_patterns)]
 
-use std::convert::TryInto;
-
 use codec::{
     Decode,
     Encode,
     Error as CodecError,
 };
+use core::{
+    convert::TryInto,
+    marker::PhantomData,
+};
+use frame_metadata::RuntimeMetadataPrefixed;
 use jsonrpsee::{
     client::Subscription,
     common::{
@@ -34,10 +37,7 @@ use jsonrpsee::{
     },
     Client,
 };
-
 use num_traits::bounds::Bounded;
-
-use frame_metadata::RuntimeMetadataPrefixed;
 use sc_rpc_api::state::ReadProof;
 use serde::Serialize;
 use sp_core::{
@@ -62,7 +62,6 @@ use sp_runtime::{
 };
 use sp_transaction_pool::TransactionStatus;
 use sp_version::RuntimeVersion;
-use std::marker::PhantomData;
 
 use crate::{
     error::Error,
@@ -110,18 +109,26 @@ where
 }
 
 /// Client for substrate rpc interfaces
-#[derive(Clone)]
 pub struct Rpc<T: System> {
     client: Client,
-    marker: std::marker::PhantomData<T>,
+    marker: PhantomData<T>,
+}
+
+impl<T: System> Clone for Rpc<T> {
+    fn clone(&self) -> Self {
+        Self {
+            client: self.client.clone(),
+            marker: PhantomData,
+        }
+    }
 }
 
 impl<T: System> Rpc<T> {
-    pub async fn new(client: Client) -> Result<Self, Error> {
-        Ok(Rpc {
+    pub fn new(client: Client) -> Self {
+        Self {
             client,
             marker: PhantomData,
-        })
+        }
     }
 
     /// Fetch a storage key