feat(networking): QUIC receive window override env

Allow to pass ANT_MAX_STREAM_DATA=x to override the stream receive
window setting in libp2p/quinn.

ant-networking/src/transport.rs

@@ -14,6 +14,8 @@ use libp2p::{
     PeerId, Transport as _,
 };
 
+const MAX_STREAM_DATA_ENV_STR: &str = "ANT_MAX_STREAM_DATA";
+
 pub(crate) fn build_transport(
     keypair: &Keypair,
     #[cfg(feature = "open-metrics")] registries: &mut MetricsRegistries,
@@ -30,5 +32,18 @@ pub(crate) fn build_transport(
 fn generate_quic_transport(
     keypair: &Keypair,
 ) -> libp2p::quic::GenTransport<libp2p::quic::tokio::Provider> {
-    libp2p::quic::tokio::Transport::new(libp2p::quic::Config::new(keypair))
+    let mut quic_config = libp2p::quic::Config::new(keypair);
+    if let Ok(val) = std::env::var(MAX_STREAM_DATA_ENV_STR) {
+        match val.parse::<u32>() {
+            Ok(val) => {
+                quic_config.max_stream_data = val;
+                tracing::info!("Overriding QUIC connection receive window value to {val}");
+            }
+            Err(e) => {
+                tracing::warn!("QUIC connection receive window value override failed. Could not parse `{MAX_STREAM_DATA_ENV_STR}={val}` as integer: {e}")
+            }
+        }
+    }
+
+    libp2p::quic::tokio::Transport::new(quic_config)
 }