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/lib.rs

@@ -45,18 +45,44 @@ pub use getrandom as _;
 pub mod backend;
 pub mod blocks;
 pub mod client;
-pub mod config;
 pub mod constants;
 pub mod custom_values;
-pub mod dynamic;
 pub mod error;
 pub mod events;
-pub mod metadata;
 pub mod runtime_api;
 pub mod storage;
 pub mod tx;
 pub mod utils;
 
+/// This module provides a [`Config`] type, which is used to define various
+/// types that are important in order to speak to a particular chain.
+/// [`SubstrateConfig`] provides a default set of these types suitable for the
+/// default Substrate node implementation, and [`PolkadotConfig`] for a
+/// Polkadot node.
+pub mod config {
+    pub use subxt_core::config::{
+        polkadot, signed_extensions, substrate, BlockHash, Config, DefaultExtrinsicParams,
+        DefaultExtrinsicParamsBuilder, ExtrinsicParams, ExtrinsicParamsEncoder, Hasher, Header,
+        PolkadotConfig, PolkadotExtrinsicParams, RefineParams, RefineParamsData, SignedExtension,
+        SubstrateConfig, SubstrateExtrinsicParams,
+    };
+    pub use subxt_core::error::ExtrinsicParamsError;
+}
+
+/// Types representing the metadata obtained from a node.
+pub mod metadata {
+    pub use subxt_core::metadata::{DecodeWithMetadata, EncodeWithMetadata, Metadata, MetadataExt};
+    // Expose metadata types under a sub module in case somebody needs to reference them:
+    pub use subxt_metadata as types;
+}
+
+/// Submit dynamic transactions.
+pub mod dynamic {
+    pub use subxt_core::dynamic::{
+        constant, runtime_api_call, storage, tx, At, DecodedValue, DecodedValueThunk, Value,
+    };
+}
+
 // Internal helper macros
 #[macro_use]
 mod macros;
@@ -84,10 +110,10 @@ pub mod ext {
     pub use scale_decode;
     pub use scale_encode;
     pub use scale_value;
+    pub use subxt_core;
 
     cfg_substrate_compat! {
-        pub use sp_runtime;
-        pub use sp_core;
+        pub use subxt_core::ext::{sp_runtime, sp_core};
     }
 }
 
@@ -127,15 +153,15 @@ pub mod ext {
 ///
 /// ## `crate = "..."`
 ///
-/// Use this attribute to specify a custom path to the `subxt` crate:
+/// Use this attribute to specify a custom path to the `subxt_core` crate:
 ///
 /// ```rust
-/// # pub extern crate subxt;
-/// # pub mod path { pub mod to { pub use subxt; } }
+/// # pub extern crate subxt_core;
+/// # pub mod path { pub mod to { pub use subxt_core; } }
 /// # fn main() {}
 /// #[subxt::subxt(
 ///     runtime_metadata_path = "../artifacts/polkadot_metadata_full.scale",
-///     crate = "crate::path::to::subxt"
+///     crate = "crate::path::to::subxt_core"
 /// )]
 /// mod polkadot {}
 /// ```