Add 'Static' type and improve type substitution codegen to accept it (#886)

* Add Static type which defers to Encode/Decode and impls EncodeAsType/DecodeAsType

* rename to static_type and impl Deref/Mut

* Improve type substitution in codegen so that concrete types can be swapped in

* A couple of comment tweaks and no need for a macro export

* Extend type substitution logic to work recursively on destination type

* cargo fmt

* Fix a couple of comments

* update ui test outpuot

* Add docs and missing_docs lint

* Add test for replacing multiple of Ident

* Update codegen/src/error.rs

Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com>

* update copyright year and fix ui test

* simplify another error

---------

Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com>

codegen/src/utils/fetch_metadata.rs

@@ -1,3 +1,8 @@
+// Copyright 2019-2023 Parity Technologies (UK) Ltd.
+// This file is dual-licensed as Apache-2.0 or GPL-3.0.
+// see LICENSE for license details.
+
+use crate::error::FetchMetadataError;
 use jsonrpsee::{
     async_client::ClientBuilder,
     client_transport::ws::{Uri, WsTransportClientBuilder},
@@ -67,40 +72,3 @@ async fn fetch_metadata_http(url: &Uri) -> Result<String, FetchMetadataError> {
 
     Ok(client.request("state_getMetadata", rpc_params![]).await?)
 }
-
-#[derive(Debug)]
-pub enum FetchMetadataError {
-    DecodeError(hex::FromHexError),
-    RequestError(jsonrpsee::core::Error),
-    InvalidScheme(String),
-}
-
-impl std::fmt::Display for FetchMetadataError {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        match self {
-            FetchMetadataError::DecodeError(e) => {
-                write!(f, "Cannot decode hex value: {e}")
-            }
-            FetchMetadataError::RequestError(e) => write!(f, "Request error: {e}"),
-            FetchMetadataError::InvalidScheme(s) => {
-                write!(
-                    f,
-                    "'{s}' not supported, supported URI schemes are http, https, ws or wss."
-                )
-            }
-        }
-    }
-}
-
-impl std::error::Error for FetchMetadataError {}
-
-impl From<hex::FromHexError> for FetchMetadataError {
-    fn from(e: hex::FromHexError) -> Self {
-        FetchMetadataError::DecodeError(e)
-    }
-}
-impl From<jsonrpsee::core::Error> for FetchMetadataError {
-    fn from(e: jsonrpsee::core::Error) -> Self {
-        FetchMetadataError::RequestError(e)
-    }
-}

codegen/src/utils/mod.rs

@@ -1,3 +1,9 @@
+// Copyright 2019-2023 Parity Technologies (UK) Ltd.
+// This file is dual-licensed as Apache-2.0 or GPL-3.0.
+// see LICENSE for license details.
+
+//! Utilities to help with fetching and decoding metadata.
+
 mod fetch_metadata;
 
 // easy access to this type needed for fetching metadata:
@@ -5,5 +11,5 @@ pub use jsonrpsee::client_transport::ws::Uri;
 
 pub use fetch_metadata::{
     fetch_metadata_bytes, fetch_metadata_bytes_blocking, fetch_metadata_hex,
-    fetch_metadata_hex_blocking, FetchMetadataError,
+    fetch_metadata_hex_blocking,
 };