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+use crate::config::Config;
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+use crate::lazer_publisher::LazerPublisher;
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+use crate::websocket_utils::{handle_websocket_error, send_text};
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+use anyhow::Error;
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+use futures::{AsyncRead, AsyncWrite};
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+use futures_util::io::{BufReader, BufWriter};
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+use hyper_util::rt::TokioIo;
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+use pyth_lazer_protocol::jrpc::{
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+ GetMetadataParams, JrpcCall, JrpcError, JrpcErrorResponse, JrpcResponse, JrpcSuccessResponse,
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+ JsonRpcVersion, PythLazerAgentJrpcV1, SymbolMetadata,
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+};
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+use soketto::Sender;
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+use soketto::handshake::http::Server;
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+use std::str::FromStr;
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+use tokio::{pin, select};
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+use tokio_util::compat::TokioAsyncReadCompatExt;
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+use tracing::{debug, error, instrument};
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+use url::Url;
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+
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+const DEFAULT_HISTORY_SERVICE_URL: &str =
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+ "https://history.pyth-lazer.dourolabs.app/history/v1/symbols";
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+
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+pub struct JrpcConnectionContext {}
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+
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+#[instrument(
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+ skip(server, request, lazer_publisher, context),
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+ fields(component = "jrpc_ws")
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+)]
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+pub async fn handle_jrpc(
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+ config: Config,
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+ server: Server,
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+ request: hyper::Request<hyper::body::Incoming>,
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+ context: JrpcConnectionContext,
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+ lazer_publisher: LazerPublisher,
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+) {
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+ if let Err(err) = try_handle_jrpc(config, server, request, context, lazer_publisher).await {
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+ handle_websocket_error(err);
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+ }
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+}
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+
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+#[instrument(
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+ skip(server, request, lazer_publisher, _context),
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+ fields(component = "jrpc_ws")
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+)]
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+async fn try_handle_jrpc(
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+ config: Config,
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+ server: Server,
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+ request: hyper::Request<hyper::body::Incoming>,
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+ _context: JrpcConnectionContext,
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+ lazer_publisher: LazerPublisher,
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+) -> anyhow::Result<()> {
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+ let stream = hyper::upgrade::on(request).await?;
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+ let io = TokioIo::new(stream);
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+ let stream = BufReader::new(BufWriter::new(io.compat()));
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+ let (mut ws_sender, mut ws_receiver) = server.into_builder(stream).finish();
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+
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+ let mut receive_buf = Vec::new();
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+
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+ loop {
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+ receive_buf.clear();
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+ {
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+ // soketto is not cancel-safe, so we need to store the future and poll it
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+ // in the inner loop.
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+ let receive = async { ws_receiver.receive(&mut receive_buf).await };
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+ pin!(receive);
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+ #[allow(clippy::never_loop, reason = "false positive")] // false positive
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+ loop {
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+ select! {
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+ _result = &mut receive => {
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+ break
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+ }
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+ }
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+ }
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+ }
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+
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+ match handle_jrpc_inner(&config, &mut ws_sender, &mut receive_buf, &lazer_publisher).await {
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+ Ok(_) => {}
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+ Err(err) => {
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+ debug!("Error handling JRPC request: {}", err);
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+ send_text(
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+ &mut ws_sender,
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+ serde_json::to_string::<JrpcResponse<()>>(&JrpcResponse::Error(
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+ JrpcErrorResponse {
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+ jsonrpc: JsonRpcVersion::V2,
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+ error: JrpcError::InternalError.into(),
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+ id: None,
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+ },
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+ ))?
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+ .as_str(),
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+ )
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+ .await?;
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+ }
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+ }
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+ }
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+}
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+
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+async fn handle_jrpc_inner<T: AsyncRead + AsyncWrite + Unpin>(
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+ config: &Config,
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+ sender: &mut Sender<T>,
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+ receive_buf: &mut Vec<u8>,
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+ lazer_publisher: &LazerPublisher,
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+) -> anyhow::Result<()> {
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+ match serde_json::from_slice::<PythLazerAgentJrpcV1>(receive_buf.as_slice()) {
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+ Ok(jrpc_request) => match jrpc_request.params {
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+ JrpcCall::PushUpdate(request_params) => {
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+ match lazer_publisher
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+ .push_feed_update(request_params.into())
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+ .await
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+ {
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+ Ok(_) => {
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+ send_text(
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+ sender,
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+ serde_json::to_string::<JrpcResponse<String>>(&JrpcResponse::Success(
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+ JrpcSuccessResponse::<String> {
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+ jsonrpc: JsonRpcVersion::V2,
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+ result: "success".to_string(),
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+ id: jrpc_request.id,
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+ },
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+ ))?
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+ .as_str(),
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+ )
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+ .await?;
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+ }
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+ Err(err) => {
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+ debug!("error while sending updates: {:?}", err);
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+ send_text(
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+ sender,
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+ serde_json::to_string::<JrpcResponse<()>>(&JrpcResponse::Error(
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+ JrpcErrorResponse {
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+ jsonrpc: JsonRpcVersion::V2,
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+ error: JrpcError::InternalError.into(),
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+ id: Some(jrpc_request.id),
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+ },
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+ ))?
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+ .as_str(),
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+ )
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+ .await?;
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+ }
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+ }
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+ }
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+ JrpcCall::GetMetadata(request_params) => match get_metadata(config.clone()).await {
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+ Ok(symbols) => {
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+ let symbols = filter_symbols(symbols.clone(), request_params);
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+
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+ send_text(
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+ sender,
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+ serde_json::to_string::<JrpcResponse<Vec<SymbolMetadata>>>(
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+ &JrpcResponse::Success(JrpcSuccessResponse::<Vec<SymbolMetadata>> {
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+ jsonrpc: JsonRpcVersion::V2,
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+ result: symbols,
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+ id: jrpc_request.id,
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+ }),
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+ )?
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+ .as_str(),
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+ )
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+ .await?;
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+ }
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+ Err(err) => {
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+ error!("error while retrieving metadata: {:?}", err);
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+ send_text(
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+ sender,
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+ serde_json::to_string::<JrpcResponse<()>>(&JrpcResponse::Error(
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+ JrpcErrorResponse {
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+ jsonrpc: JsonRpcVersion::V2,
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+ // note: right now specifying an invalid method results in a parse error
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+ error: JrpcError::InternalError.into(),
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+ id: None,
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+ },
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+ ))?
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+ .as_str(),
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+ )
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+ .await?;
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+ }
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+ },
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+ },
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+ Err(err) => {
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+ debug!("Error parsing JRPC request: {}", err);
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+ send_text(
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+ sender,
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+ serde_json::to_string::<JrpcResponse<()>>(&JrpcResponse::Error(
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+ JrpcErrorResponse {
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+ jsonrpc: JsonRpcVersion::V2,
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+ error: JrpcError::ParseError(err.to_string()).into(),
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+ id: None,
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+ },
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+ ))?
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+ .as_str(),
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+ )
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+ .await?;
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+ }
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+ }
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+ Ok(())
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+}
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+
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+async fn get_metadata(config: Config) -> Result<Vec<SymbolMetadata>, Error> {
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+ let result = reqwest::get(
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+ config
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+ .history_service_url
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+ .unwrap_or(Url::from_str(DEFAULT_HISTORY_SERVICE_URL)?),
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+ )
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+ .await?;
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+
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+ if result.status().is_success() {
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+ Ok(serde_json::from_str::<Vec<SymbolMetadata>>(
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+ &result.text().await?,
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+ )?)
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+ } else {
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+ Err(anyhow::anyhow!(
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+ "Error getting metadata (status_code={}, body={})",
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+ result.status(),
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+ result.text().await.unwrap_or("none".to_string())
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+ ))
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+ }
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+}
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+
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+fn filter_symbols(
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+ symbols: Vec<SymbolMetadata>,
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+ get_metadata_params: GetMetadataParams,
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+) -> Vec<SymbolMetadata> {
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+ let names = &get_metadata_params.names.clone();
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+ let asset_types = &get_metadata_params.asset_types.clone();
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+
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+ let res: Vec<SymbolMetadata> = symbols
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+ .into_iter()
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+ .filter(|symbol| {
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+ if let Some(names) = names {
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+ if !names.contains(&symbol.name) {
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+ return false;
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+ }
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+ }
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+
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+ if let Some(asset_types) = asset_types {
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+ if !asset_types.contains(&symbol.asset_type) {
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+ return false;
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+ }
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+ }
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+
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+ true
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+ })
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+ .collect();
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+
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+ res
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+}
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+
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+#[cfg(test)]
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+pub mod tests {
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+ use super::*;
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+ use pyth_lazer_protocol::router::{Channel, FixedRate, PriceFeedId};
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+ use pyth_lazer_protocol::symbol_state::SymbolState;
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+ use std::net::SocketAddr;
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+
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+ fn gen_test_symbol(name: String, asset_type: String) -> SymbolMetadata {
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+ SymbolMetadata {
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+ pyth_lazer_id: PriceFeedId(1),
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+ name,
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+ symbol: "".to_string(),
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+ description: "".to_string(),
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+ asset_type,
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+ exponent: 0,
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+ cmc_id: None,
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+ funding_rate_interval: None,
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+ min_publishers: 0,
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+ min_channel: Channel::FixedRate(FixedRate::MIN),
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+ state: SymbolState::Stable,
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+ hermes_id: None,
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+ quote_currency: None,
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+ }
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+ }
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+
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+ #[tokio::test]
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+ #[ignore]
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+ async fn test_try_get_metadata() {
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+ let config = Config {
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+ listen_address: SocketAddr::from(([127, 0, 0, 1], 0)),
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+ relayer_urls: vec![],
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+ authorization_token: None,
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+ publish_keypair_path: Default::default(),
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+ publish_interval_duration: Default::default(),
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+ history_service_url: None,
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+ };
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+
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+ println!("{:?}", get_metadata(config).await.unwrap());
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+ }
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+
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+ #[test]
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+ fn test_filter_symbols() {
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+ let symbol1 = gen_test_symbol("BTC".to_string(), "crypto".to_string());
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+ let symbol2 = gen_test_symbol("XMR".to_string(), "crypto".to_string());
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+ let symbol3 = gen_test_symbol("BTCUSDT".to_string(), "funding-rate".to_string());
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+ let symbols = vec![symbol1.clone(), symbol2.clone(), symbol3.clone()];
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+
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+ // just a name filter
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+ assert_eq!(
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+ filter_symbols(
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+ symbols.clone(),
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+ GetMetadataParams {
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+ names: Some(vec!["XMR".to_string()]),
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+ asset_types: None,
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+ },
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+ ),
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+ vec![symbol2.clone()]
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+ );
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+
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+ // just an asset type filter
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+ assert_eq!(
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+ filter_symbols(
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+ symbols.clone(),
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+ GetMetadataParams {
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+ names: None,
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+ asset_types: Some(vec!["crypto".to_string()]),
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+ },
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+ ),
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+ vec![symbol1.clone(), symbol2.clone()]
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+ );
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+
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+ // name and asset type
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+ assert_eq!(
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+ filter_symbols(
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+ symbols.clone(),
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+ GetMetadataParams {
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+ names: Some(vec!["BTC".to_string()]),
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+ asset_types: Some(vec!["crypto".to_string()]),
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+ },
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+ ),
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+ vec![symbol1.clone()]
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+ );
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+ }
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+}
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Ayush Suresh