Add light client platform WASM compatible (#1026)

* Cargo update in prep for wasm build

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Add light client test

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Implement low level socket

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Add native platform primitives

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Add wasm platform primitives

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Implement smoldot platform

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Adjust code to use custom platform

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Adjust feature flags

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* tests: Adjust wasm endpoint to accept ws for p2p

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Adjust wasm socket

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Book mention of wasm

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* ci: Propagate env variable properly

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt: Revert to native feature flags

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Use tokio rt-multi-thread feature

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* subxt: Add tokio feature flags for native platform

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* wasm: Use polkadot live for wasm testing

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* wasm: Add support for DNS p2p addresses

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* wasm: Disable logs

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* wasm: Run wasm test for firefox driver

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* wasm: Reenable chrome driver

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Move lightclient RPC to dedicated crate for better feature flags and modularity

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Use subxt-lightclient low level RPC crate

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Apply cargo fmt

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Enable default:native feature for cargo check

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* ci: Extra step for subxt-lightclient similar to signer crate

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Remove native platform code and use smoldot instead

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* codegen: Enable tokio/multi-threads

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* lightclient: Refactor modules

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Adjust testing crates

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* ci: Run light-client WASM tests

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* wasm-rpc: Remove light-client imports

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* testing: Update wasm cargo.lock files

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* ci: Spawn substrate node with deterministic p2p address for WASM tests

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* wasm_socket: Use rc and refcell

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* wasm_socket: Switch back to Arc<Mutex<>>

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Add comments

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

---------

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

testing/wasm-rpc-tests/tests/wasm.rs

@@ -0,0 +1,34 @@
+#![cfg(target_arch = "wasm32")]
+
+use subxt::{config::PolkadotConfig};
+use wasm_bindgen_test::*;
+
+wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);
+
+// Run the tests by calling:
+//
+// ```text
+// wasm-pack test --firefox --headless`
+// ```
+//
+// You'll need to have a substrate/polkadot node running:
+//
+// ```bash
+// ./polkadot --dev
+// ```
+//
+// Use the following to enable logs:
+// ```
+//  console_error_panic_hook::set_once();
+//  tracing_wasm::set_as_global_default();
+// ```
+
+#[wasm_bindgen_test]
+async fn wasm_ws_transport_works() {
+    let client = subxt::client::OnlineClient::<PolkadotConfig>::from_url("ws://127.0.0.1:9944")
+        .await
+        .unwrap();
+
+    let chain = client.rpc().system_chain().await.unwrap();
+    assert_eq!(&chain, "Development");
+}