Add socks proxy for client websocket connection (#16051)

Release Notes:

- Added socks proxy for client websocket connection

crates/client/src/socks.rs

@@ -0,0 +1,68 @@
+//! socks proxy
+use anyhow::{anyhow, Result};
+use futures::io::{AsyncRead, AsyncWrite};
+use http_client::Uri;
+use tokio_socks::{
+    io::Compat,
+    tcp::{Socks4Stream, Socks5Stream},
+};
+
+pub(crate) async fn connect_socks_proxy_stream(
+    proxy: Option<&Uri>,
+    rpc_host: (&str, u16),
+) -> Result<Box<dyn AsyncReadWrite>> {
+    let stream = match parse_socks_proxy(proxy) {
+        Some((socks_proxy, SocksVersion::V4)) => {
+            let stream = Socks4Stream::connect_with_socket(
+                Compat::new(smol::net::TcpStream::connect(socks_proxy).await?),
+                rpc_host,
+            )
+            .await
+            .map_err(|err| anyhow!("error connecting to socks {}", err))?;
+            Box::new(stream) as Box<dyn AsyncReadWrite>
+        }
+        Some((socks_proxy, SocksVersion::V5)) => Box::new(
+            Socks5Stream::connect_with_socket(
+                Compat::new(smol::net::TcpStream::connect(socks_proxy).await?),
+                rpc_host,
+            )
+            .await
+            .map_err(|err| anyhow!("error connecting to socks {}", err))?,
+        ) as Box<dyn AsyncReadWrite>,
+        None => Box::new(smol::net::TcpStream::connect(rpc_host).await?) as Box<dyn AsyncReadWrite>,
+    };
+    Ok(stream)
+}
+
+fn parse_socks_proxy(proxy: Option<&Uri>) -> Option<((String, u16), SocksVersion)> {
+    let Some(proxy_uri) = proxy else {
+        return None;
+    };
+    let Some(scheme) = proxy_uri.scheme_str() else {
+        return None;
+    };
+    let socks_version = if scheme.starts_with("socks4") {
+        // socks4
+        SocksVersion::V4
+    } else if scheme.starts_with("socks") {
+        // socks, socks5
+        SocksVersion::V5
+    } else {
+        return None;
+    };
+    if let (Some(host), Some(port)) = (proxy_uri.host(), proxy_uri.port_u16()) {
+        Some(((host.to_string(), port), socks_version))
+    } else {
+        None
+    }
+}
+
+// private helper structs and traits
+
+enum SocksVersion {
+    V4,
+    V5,
+}
+
+pub(crate) trait AsyncReadWrite: AsyncRead + AsyncWrite + Unpin + Send + 'static {}
+impl<T: AsyncRead + AsyncWrite + Unpin + Send + 'static> AsyncReadWrite for T {}