subxt-core crate (#1466)

* start migrating, broken

* first iteration of updating

* fmt and clippy

* add Composite<u32> decoding via scale value patch

* bump scale type gen versions

* fix decoding with new scale decode

* compiling with changed deps

* core utils, condig, client, metadata

* core crate compiling

* signer crate no once lock

* add core to no-std-tests, change imports

* broken commit, start pulling everything together in subxt

* port more things to subxt

* events in core crate, extrinsics sadly much more difficult

* almost all examples pass again

* dynamic values fix in examples

* fix no std issue and fmt

* remove unused dependencies

* fix lightclient impl

* runtime version refactor

* formatting and addressing nits

* more comments addressed

* update wasm example and no-std-signer tests

* other nits and error impl on signer errors

* fix feature flag

* fix runtime version refactor

* fix doc links

* fix integration tests

* fix feature flag gated client state

* fix native feature in CI

* fix lightclient utils

* make imports more lean in subxt-core

* integrate changes from subxt-core imports into subxt

* other changes in subxt simplify imports more

* fix  and docs

* doc false for cli

* fix clippy

* remove events block hash in tests

* codegen no-std support in generated code

* export alloc crate for no-std codegen

* fix doc test

* implement James comments

* remove std traits, use core traits instead

* address nits

* remove unusued dep in no-std tests

* fix Box import in no_std

* sp-crypto-hashing instead of sp-core-hashing

* bump scale-typegen, add no std codegen tests

* fix some things

* replace unmaintained derivative with derive_where to remove non-canonical warnings

* fmt

* remove unused dep

* fix deps

* update artifacts to fix type ID mismatches

* bump to latest scale-typegen

---------

Co-authored-by: James Wilson <james@jsdw.me>

subxt/src/client/offline_client.rs

@@ -4,13 +4,13 @@
 
 use crate::custom_values::CustomValuesClient;
 use crate::{
-    backend::RuntimeVersion, blocks::BlocksClient, constants::ConstantsClient,
-    events::EventsClient, runtime_api::RuntimeApiClient, storage::StorageClient, tx::TxClient,
-    Config, Metadata,
+    blocks::BlocksClient, constants::ConstantsClient, events::EventsClient,
+    runtime_api::RuntimeApiClient, storage::StorageClient, tx::TxClient, Config, Metadata,
 };
-use derivative::Derivative;
 
+use derive_where::derive_where;
 use std::sync::Arc;
+use subxt_core::client::{ClientState, RuntimeVersion};
 
 /// A trait representing a client that can perform
 /// offline-only actions.
@@ -21,6 +21,10 @@ pub trait OfflineClientT<T: Config>: Clone + Send + Sync + 'static {
     fn genesis_hash(&self) -> T::Hash;
     /// Return the provided [`RuntimeVersion`].
     fn runtime_version(&self) -> RuntimeVersion;
+    /// Return the [subxt_core::client::ClientState] (metadata, runtime version and genesis hash).
+    fn client_state(&self) -> ClientState<T> {
+        ClientState::new(self.genesis_hash(), self.runtime_version(), self.metadata())
+    }
 
     /// Work with transactions.
     fn tx(&self) -> TxClient<T, Self> {
@@ -60,18 +64,9 @@ pub trait OfflineClientT<T: Config>: Clone + Send + Sync + 'static {
 
 /// A client that is capable of performing offline-only operations.
 /// Can be constructed as long as you can populate the required fields.
-#[derive(Derivative)]
-#[derivative(Debug(bound = ""), Clone(bound = ""))]
+#[derive_where(Debug, Clone)]
 pub struct OfflineClient<T: Config> {
-    inner: Arc<Inner<T>>,
-}
-
-#[derive(Derivative)]
-#[derivative(Debug(bound = ""), Clone(bound = ""))]
-struct Inner<T: Config> {
-    genesis_hash: T::Hash,
-    runtime_version: RuntimeVersion,
-    metadata: Metadata,
+    inner: Arc<ClientState<T>>,
 }
 
 impl<T: Config> OfflineClient<T> {
@@ -83,27 +78,36 @@ impl<T: Config> OfflineClient<T> {
         metadata: impl Into<Metadata>,
     ) -> OfflineClient<T> {
         OfflineClient {
-            inner: Arc::new(Inner {
+            inner: Arc::new(ClientState::new(
                 genesis_hash,
                 runtime_version,
-                metadata: metadata.into(),
-            }),
+                metadata.into(),
+            )),
         }
     }
 
     /// Return the genesis hash.
     pub fn genesis_hash(&self) -> T::Hash {
-        self.inner.genesis_hash
+        self.inner.genesis_hash()
     }
 
     /// Return the runtime version.
     pub fn runtime_version(&self) -> RuntimeVersion {
-        self.inner.runtime_version.clone()
+        self.inner.runtime_version()
     }
 
     /// Return the [`Metadata`] used in this client.
     pub fn metadata(&self) -> Metadata {
-        self.inner.metadata.clone()
+        self.inner.metadata()
+    }
+
+    /// Return the [subxt_core::client::ClientState] (metadata, runtime version and genesis hash).
+    pub fn client_state(&self) -> ClientState<T> {
+        ClientState::new(
+            self.inner.genesis_hash(),
+            self.inner.runtime_version(),
+            self.inner.metadata(),
+        )
     }
 
     // Just a copy of the most important trait methods so that people
@@ -145,6 +149,9 @@ impl<T: Config> OfflineClientT<T> for OfflineClient<T> {
     fn metadata(&self) -> Metadata {
         self.metadata()
     }
+    fn client_state(&self) -> ClientState<T> {
+        self.client_state()
+    }
 }
 
 // For ergonomics; cloning a client is deliberately fairly cheap (via Arc),