Tangle subxt (#505)

* tangle subxt

* clippy fix

* export subxt and scale code package

* remove build script

Cargo.toml

@@ -34,6 +34,7 @@ members = [
  "precompiles/proxy",
  "precompiles/preimage",
  "precompiles/jobs",
+ "tangle-subxt"
  # "relayer-gadget",
  # "relayer-gadget/cli",
 ]

tangle-subxt/Cargo.toml

@@ -0,0 +1,29 @@
+[package]
+name = "tangle-subxt"
+version ={ workspace = true }
+authors = { workspace = true }
+edition = { workspace = true }
+homepage = { workspace = true }
+license = { workspace = true }
+repository = { workspace = true }
+
+[dependencies]
+parity-scale-codec = { workspace = true, optional = true }
+scale-info = { workspace = true, optional = true }
+subxt = { version = "0.31.0", optional = true }
+subxt-metadata = { version = "0.31.0", optional = true }
+subxt-codegen = { version = "0.31.0", optional = true }
+serde_json = "1"
+syn = { version = "2", features = ["full", "parsing"], optional = true }
+
+
+[features]
+default = [
+    "subxt",
+    "subxt-codegen",
+    "subxt-metadata",
+    "parity-scale-codec",
+    "scale-info",
+    "syn"
+]
+

tangle-subxt/README.md

@@ -0,0 +1,33 @@
+<h1 align="center">Tangle-Subxt</h1>
+
+<p align="center">
+    <strong>Rust interface to interact with tangle node via RPC</strong>
+    <br />
+</p>
+
+<br />
+
+### Downloading metadata from a Substrate node
+
+Use the [`subxt-cli`](https://lib.rs/crates/subxt-cli) tool to download the metadata for your target runtime from a node.
+
+1. Install:
+```bash
+cargo install subxt-cli
+```
+
+2. To Save the metadata of `tangle`:
+Run the release build of the `tangle` node, then on another terminal run:
+
+```bash
+subxt metadata -f bytes > ./metadata/tangle-runtime.scale
+```
+
+3. Generating the subxt code from the metadata:
+
+```bash
+subxt codegen --file metadata/tangle-runtime.scale > src/tangle_runtime.rs
+```
+
+
+

tangle-subxt/src/lib.rs

@@ -0,0 +1,14 @@
+#![deny(
+	trivial_casts,
+	trivial_numeric_casts,
+	stable_features,
+	non_shorthand_field_patterns,
+	renamed_and_removed_lints,
+	unsafe_code,
+	clippy::exhaustive_enums
+)]
+#![allow(clippy::all, clippy::exhaustive_enums)]
+pub mod tangle_runtime;
+pub use parity_scale_codec;
+pub use scale_info;
+pub use subxt;