fix: Convert vendor/pezkuwi-subxt from submodule to regular directory

vendor/pezkuwi-subxt/subxt/examples/setup_reconnecting_rpc_client.rs

@@ -0,0 +1,77 @@
+//! Example to utilize the `reconnecting rpc client` in subxt
+//! which hidden behind behind `--feature reconnecting-rpc-client`
+//!
+//! To utilize full logs from the RPC client use:
+//! `RUST_LOG="jsonrpsee=trace,subxt-reconnecting-rpc-client=trace"`
+
+#![allow(missing_docs)]
+
+use std::time::Duration;
+
+use futures::StreamExt;
+use subxt::backend::rpc::reconnecting_rpc_client::{ExponentialBackoff, RpcClient};
+use subxt::{OnlineClient, PolkadotConfig};
+
+// Generate an interface that we can use from the node's metadata.
+#[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_small.scale")]
+pub mod polkadot {}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    tracing_subscriber::fmt::init();
+
+    // Create a new client with a reconnecting RPC client.
+    let rpc = RpcClient::builder()
+        // Reconnect with exponential backoff
+        //
+        // This API is "iterator-like" and we use `take` to limit the number of retries.
+        .retry_policy(
+            ExponentialBackoff::from_millis(100)
+                .max_delay(Duration::from_secs(10))
+                .take(3),
+        )
+        // There are other configurations as well that can be found at [`reconnecting_rpc_client::ClientBuilder`].
+        .build("ws://localhost:9944".to_string())
+        .await?;
+
+    // If you want to use the chainhead backend with the reconnecting RPC client, you can do so like this:
+    //
+    // ```
+    // use subxt::backend::chain_head:ChainHeadBackend;
+    // use subxt::OnlineClient;
+    //
+    // let backend = ChainHeadBackend::builder().build_with_background_task(RpcClient::new(rpc.clone()));
+    // let api: OnlineClient<PolkadotConfig> = OnlineClient::from_backend(Arc::new(backend)).await?;
+    // ```
+
+    let api: OnlineClient<PolkadotConfig> = OnlineClient::from_rpc_client(rpc.clone()).await?;
+
+    // Run for at most 100 blocks and print a bunch of information about it.
+    //
+    // The subscription is automatically re-started when the RPC client has reconnected.
+    // You can test that by stopping the polkadot node and restarting it.
+    let mut blocks_sub = api.blocks().subscribe_finalized().await?.take(100);
+
+    while let Some(block) = blocks_sub.next().await {
+        let block = match block {
+            Ok(b) => b,
+            Err(e) => {
+                // This can only happen on the legacy backend and the unstable backend
+                // will handle this internally.
+                if e.is_disconnected_will_reconnect() {
+                    println!("The RPC connection was lost and we may have missed a few blocks");
+                    continue;
+                }
+
+                return Err(e.into());
+            }
+        };
+
+        let block_number = block.number();
+        let block_hash = block.hash();
+
+        println!("Block #{block_number} ({block_hash})");
+    }
+
+    Ok(())
+}