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feat: add replica-aware relay-to-relay forwarding

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L
2026-02-23 23:23:22 +00:00
parent 050dbc792a
commit e7ef7fdf70
3 changed files with 270 additions and 32 deletions
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289
relay/src/main.rs
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@@ -10,13 +10,14 @@ use common::{
codec::{read_frame, write_frame},
minecraft::read_handshake_hostname_and_bytes,
protocol::{
ClientFrame, Heartbeat, IncomingTcp, RegisterAccepted, RegisterRequest, ServerFrame,
StreamClosed, StreamData,
ClientFrame, Heartbeat, IncomingTcp, RegisterAccepted, RegisterRequest, RelayForwardPrelude,
ServerFrame, StreamClosed, StreamData,
},
};
use redis::AsyncCommands;
use serde::Deserialize;
use tokio::{
io::{AsyncReadExt, AsyncWriteExt},
io::{AsyncReadExt, AsyncWriteExt, copy_bidirectional},
net::{TcpListener, TcpStream},
sync::{Notify, RwLock, mpsc},
time::{MissedTickBehavior, interval, timeout},
@@ -30,21 +31,31 @@ struct RelayConfig {
region: String,
control_bind: String,
player_bind: String,
r2r_bind: String,
r2r_advertise_addr: String,
domain: String,
heartbeat_timeout: Duration,
registry_ttl_secs: u64,
r2r_connect_timeout: Duration,
}
impl RelayConfig {
fn from_env() -> Self {
let control_bind = std::env::var("RELAY_CONTROL_BIND")
.unwrap_or_else(|_| "0.0.0.0:7000".to_string());
let player_bind =
std::env::var("RELAY_PLAYER_BIND").unwrap_or_else(|_| "0.0.0.0:25565".to_string());
let r2r_bind = std::env::var("RELAY_R2R_BIND").unwrap_or_else(|_| "0.0.0.0:7001".to_string());
let r2r_advertise_addr = std::env::var("RELAY_R2R_ADVERTISE_ADDR")
.unwrap_or_else(|_| guess_advertise_addr(&r2r_bind));
Self {
instance_id: std::env::var("RELAY_INSTANCE_ID")
.unwrap_or_else(|_| format!("relay-{}", Uuid::new_v4())),
region: std::env::var("RELAY_REGION").unwrap_or_else(|_| "eu".to_string()),
control_bind: std::env::var("RELAY_CONTROL_BIND")
.unwrap_or_else(|_| "0.0.0.0:7000".to_string()),
player_bind: std::env::var("RELAY_PLAYER_BIND")
.unwrap_or_else(|_| "0.0.0.0:25565".to_string()),
control_bind,
player_bind,
r2r_bind,
r2r_advertise_addr,
domain: std::env::var("RELAY_BASE_DOMAIN").unwrap_or_else(|_| "dvv.one".to_string()),
heartbeat_timeout: Duration::from_secs(
std::env::var("RELAY_HEARTBEAT_TIMEOUT_SECS")
@@ -56,6 +67,12 @@ impl RelayConfig {
.ok()
.and_then(|v| v.parse().ok())
.unwrap_or(20),
r2r_connect_timeout: Duration::from_secs(
std::env::var("RELAY_R2R_CONNECT_TIMEOUT_SECS")
.ok()
.and_then(|v| v.parse().ok())
.unwrap_or(3),
),
}
}
}
@@ -88,6 +105,26 @@ impl RelayState {
type SharedState = Arc<RwLock<RelayState>>;
#[derive(Debug, Clone, Deserialize)]
struct TunnelRouteRecord {
instance_id: String,
session_id: String,
#[serde(rename = "user_id")]
_user_id: Option<String>,
#[serde(rename = "fqdn")]
_fqdn: Option<String>,
}
#[derive(Debug, Clone, Deserialize)]
struct RelayInstanceRecord {
#[serde(rename = "instance_id")]
_instance_id: String,
#[serde(rename = "region")]
_region: Option<String>,
status: Option<String>,
r2r_addr: Option<String>,
}
#[derive(Clone)]
struct RedisRegistry {
conn: Option<redis::aio::ConnectionManager>,
@@ -95,6 +132,7 @@ struct RedisRegistry {
region: String,
control_addr: String,
player_addr: String,
r2r_addr: String,
ttl_secs: u64,
}
@@ -126,6 +164,7 @@ impl RedisRegistry {
region: cfg.region.clone(),
control_addr: cfg.control_bind.clone(),
player_addr: cfg.player_bind.clone(),
r2r_addr: cfg.r2r_advertise_addr.clone(),
ttl_secs: cfg.registry_ttl_secs,
}
}
@@ -141,6 +180,7 @@ impl RedisRegistry {
"status": "active",
"control_addr": self.control_addr,
"player_addr": self.player_addr,
"r2r_addr": self.r2r_addr,
"started_at": chrono::Utc::now().timestamp(),
})
.to_string();
@@ -172,6 +212,7 @@ impl RedisRegistry {
"status": "active",
"control_addr": self.control_addr,
"player_addr": self.player_addr,
"r2r_addr": self.r2r_addr,
"tunnel_count": tunnel_count,
"updated_at": chrono::Utc::now().timestamp(),
})
@@ -199,6 +240,7 @@ impl RedisRegistry {
"status": "draining",
"control_addr": self.control_addr,
"player_addr": self.player_addr,
"r2r_addr": self.r2r_addr,
"updated_at": chrono::Utc::now().timestamp(),
})
.to_string();
@@ -248,6 +290,26 @@ impl RedisRegistry {
}
.await;
}
async fn lookup_tunnel(&self, fqdn: &str) -> Option<TunnelRouteRecord> {
let Some(mut conn) = self.conn.clone() else {
return None;
};
let key = format!("tunnel:sub:{fqdn}");
let raw: Option<String> = conn.get(key).await.ok()?;
let raw = raw?;
serde_json::from_str(&raw).ok()
}
async fn lookup_instance(&self, instance_id: &str) -> Option<RelayInstanceRecord> {
let Some(mut conn) = self.conn.clone() else {
return None;
};
let key = format!("relay:instance:{instance_id}");
let raw: Option<String> = conn.get(key).await.ok()?;
let raw = raw?;
serde_json::from_str(&raw).ok()
}
}
#[tokio::main]
@@ -269,17 +331,24 @@ async fn main() -> Result<()> {
let player_listener = TcpListener::bind(&cfg.player_bind)
.await
.with_context(|| format!("bind player {}", cfg.player_bind))?;
let r2r_listener = TcpListener::bind(&cfg.r2r_bind)
.await
.with_context(|| format!("bind r2r {}", cfg.r2r_bind))?;
info!(instance_id = %cfg.instance_id, region = %cfg.region, "relay started");
info!(
instance_id = %cfg.instance_id,
region = %cfg.region,
control = %cfg.control_bind,
player = %cfg.player_bind,
r2r = %cfg.r2r_bind,
r2r_advertise = %cfg.r2r_advertise_addr,
"relay started"
);
let shutdown = Arc::new(Notify::new());
let state: SharedState = Arc::new(RwLock::new(RelayState::new()));
let heartbeat_task = tokio::spawn(run_registry_heartbeat(
state.clone(),
registry.clone(),
shutdown.clone(),
));
let heartbeat_task = tokio::spawn(run_registry_heartbeat(state.clone(), registry.clone(), shutdown.clone()));
let control_task = tokio::spawn(run_control_accept_loop(
control_listener,
cfg.clone(),
@@ -289,17 +358,28 @@ async fn main() -> Result<()> {
));
let player_task = tokio::spawn(run_player_accept_loop(
player_listener,
cfg.clone(),
state.clone(),
registry.clone(),
shutdown.clone(),
));
let r2r_task = tokio::spawn(run_r2r_accept_loop(
r2r_listener,
cfg.clone(),
state.clone(),
shutdown.clone(),
));
tokio::pin!(heartbeat_task);
tokio::pin!(control_task);
tokio::pin!(player_task);
tokio::pin!(r2r_task);
tokio::select! {
_ = tokio::signal::ctrl_c() => info!("shutdown signal received"),
res = &mut control_task => warn!("control accept loop ended: {:?}", res),
res = &mut player_task => warn!("player accept loop ended: {:?}", res),
res = &mut r2r_task => warn!("r2r accept loop ended: {:?}", res),
res = &mut heartbeat_task => warn!("registry heartbeat task ended: {:?}", res),
}
@@ -355,7 +435,9 @@ async fn run_control_accept_loop(
async fn run_player_accept_loop(
listener: TcpListener,
cfg: RelayConfig,
state: SharedState,
registry: RedisRegistry,
shutdown: Arc<Notify>,
) -> Result<()> {
loop {
@@ -367,8 +449,10 @@ async fn run_player_accept_loop(
Err(e) => { warn!(error = %e, "player accept failed"); continue; }
};
let state = state.clone();
let registry = registry.clone();
let cfg = cfg.clone();
tokio::spawn(async move {
if let Err(e) = handle_player_conn(stream, addr, state).await {
if let Err(e) = handle_player_conn(stream, addr, cfg, state, registry).await {
debug!(peer = %addr, error = %e, "player connection closed");
}
});
@@ -378,6 +462,33 @@ async fn run_player_accept_loop(
Ok(())
}
async fn run_r2r_accept_loop(
listener: TcpListener,
cfg: RelayConfig,
state: SharedState,
shutdown: Arc<Notify>,
) -> Result<()> {
loop {
tokio::select! {
_ = shutdown.notified() => break,
res = listener.accept() => {
let (stream, addr) = match res {
Ok(v) => v,
Err(e) => { warn!(error = %e, "r2r accept failed"); continue; }
};
let state = state.clone();
let cfg = cfg.clone();
tokio::spawn(async move {
if let Err(e) = handle_r2r_conn(stream, addr, cfg, state).await {
warn!(peer = %addr, error = %e, "r2r connection ended with error");
}
});
}
}
}
Ok(())
}
async fn handle_control_conn(
stream: TcpStream,
addr: SocketAddr,
@@ -518,22 +629,134 @@ async fn control_read_loop(
async fn handle_player_conn(
mut stream: TcpStream,
addr: SocketAddr,
cfg: RelayConfig,
state: SharedState,
registry: RedisRegistry,
) -> Result<()> {
let (hostname, initial_data) = read_handshake_hostname_and_bytes(&mut stream)
.await
.context("parse minecraft handshake")?;
let session = {
let guard = state.read().await;
guard.by_fqdn.get(&hostname).cloned()
};
if let Some(session) = local_session_for_hostname(&state, &hostname).await {
return attach_player_socket_to_session(
stream,
session,
hostname,
addr.to_string(),
initial_data,
None,
"direct",
)
.await;
}
if let Some(route) = registry.lookup_tunnel(&hostname).await {
if route.instance_id == cfg.instance_id {
debug!(peer = %addr, hostname = %hostname, session_id = %route.session_id, "route points to self but local session missing");
return Ok(());
}
return proxy_player_to_owner(stream, addr, hostname, initial_data, route, cfg, registry).await;
}
debug!(peer = %addr, hostname = %hostname, "no tunnel for hostname");
Ok(())
}
async fn handle_r2r_conn(
mut stream: TcpStream,
addr: SocketAddr,
_cfg: RelayConfig,
state: SharedState,
) -> Result<()> {
let prelude: RelayForwardPrelude = read_frame(&mut stream).await.context("read r2r prelude")?;
if prelude.version != 1 {
anyhow::bail!("unsupported r2r prelude version {}", prelude.version);
}
if prelude.hop_count > 1 {
anyhow::bail!("invalid hop_count {}", prelude.hop_count);
}
let session = local_session_for_session_id(&state, &prelude.session_id).await;
let Some(session) = session else {
debug!(peer = %addr, hostname = %hostname, "no tunnel for hostname");
return Ok(());
anyhow::bail!("owner session not found for {}", prelude.session_id);
};
let stream_id = Uuid::new_v4().to_string();
attach_player_socket_to_session(
stream,
session,
prelude.fqdn.clone(),
prelude.peer_addr,
prelude.initial_data,
Some(prelude.stream_id),
"r2r",
)
.await
.with_context(|| format!("r2r attach failed from {addr}"))
}
async fn proxy_player_to_owner(
mut player_stream: TcpStream,
player_addr: SocketAddr,
hostname: String,
initial_data: Vec<u8>,
route: TunnelRouteRecord,
cfg: RelayConfig,
registry: RedisRegistry,
) -> Result<()> {
let owner = registry
.lookup_instance(&route.instance_id)
.await
.with_context(|| format!("owner instance {} not found in redis", route.instance_id))?;
if owner.status.as_deref() == Some("draining") {
debug!(owner = %route.instance_id, hostname = %hostname, "owner draining; attempting forward anyway");
}
let r2r_addr = owner
.r2r_addr
.clone()
.with_context(|| format!("owner {} missing r2r_addr", route.instance_id))?;
let mut owner_stream = timeout(cfg.r2r_connect_timeout, TcpStream::connect(&r2r_addr))
.await
.context("r2r connect timeout")??;
let prelude = RelayForwardPrelude {
version: 1,
session_id: route.session_id,
fqdn: hostname.clone(),
stream_id: Uuid::new_v4().to_string(),
peer_addr: player_addr.to_string(),
origin_instance_id: cfg.instance_id.clone(),
hop_count: 1,
initial_data,
};
write_frame(&mut owner_stream, &prelude).await?;
let _ = copy_bidirectional(&mut player_stream, &mut owner_stream).await?;
info!(peer = %player_addr, hostname = %hostname, owner = %route.instance_id, "proxied player connection to owner relay");
Ok(())
}
async fn local_session_for_hostname(state: &SharedState, hostname: &str) -> Option<SessionHandle> {
let guard = state.read().await;
guard.by_fqdn.get(hostname).cloned()
}
async fn local_session_for_session_id(state: &SharedState, session_id: &str) -> Option<SessionHandle> {
let guard = state.read().await;
let fqdn = guard.by_session.get(session_id)?.clone();
guard.by_fqdn.get(&fqdn).cloned()
}
async fn attach_player_socket_to_session(
stream: TcpStream,
session: SessionHandle,
hostname: String,
peer_addr: String,
initial_data: Vec<u8>,
stream_id_override: Option<String>,
source: &'static str,
) -> Result<()> {
let stream_id = stream_id_override.unwrap_or_else(|| Uuid::new_v4().to_string());
let (player_read, player_write) = stream.into_split();
let (to_player_tx, to_player_rx) = mpsc::channel::<Vec<u8>>(128);
session
@@ -547,7 +770,7 @@ async fn handle_player_conn(
.send(ServerFrame::IncomingTcp(IncomingTcp {
stream_id: stream_id.clone(),
session_id: session.session_id.clone(),
peer_addr: addr.to_string(),
peer_addr: peer_addr.clone(),
hostname: hostname.clone(),
initial_data,
}))
@@ -556,7 +779,6 @@ async fn handle_player_conn(
let tx_control = session.tx.clone();
let stream_id_clone = stream_id.clone();
let session_id_clone = session.session_id.clone();
let sinks = session.stream_sinks.clone();
tokio::spawn(async move {
if let Err(e) = run_player_writer(player_write, to_player_rx).await {
@@ -569,7 +791,6 @@ async fn handle_player_conn(
}))
.await;
let _ = remove_stream_sink_by_store(sinks, &stream_id_clone).await;
let _ = session_id_clone;
});
let tx_control = session.tx.clone();
@@ -588,7 +809,7 @@ async fn handle_player_conn(
let _ = remove_stream_sink_by_store(sinks, &stream_id_clone).await;
});
info!(peer = %addr, hostname = %hostname, session_id = %session.session_id, stream_id = %stream_id, "player proxied via client stream");
info!(peer = %peer_addr, hostname = %hostname, session_id = %session.session_id, stream_id = %stream_id, source, "player proxied via client stream");
Ok(())
}
@@ -621,7 +842,7 @@ async fn run_player_writer(
while let Some(chunk) = rx.recv().await {
writer.write_all(&chunk).await?;
}
writer.shutdown().await.ok();
let _ = writer.shutdown().await;
Ok(())
}
@@ -641,12 +862,8 @@ async fn lookup_stream_sink(
async fn remove_stream_sink(state: &SharedState, session_id: &str, stream_id: &str) {
let store = {
let guard = state.read().await;
let Some(fqdn) = guard.by_session.get(session_id).cloned() else {
return;
};
let Some(handle) = guard.by_fqdn.get(&fqdn) else {
return;
};
let Some(fqdn) = guard.by_session.get(session_id).cloned() else { return; };
let Some(handle) = guard.by_fqdn.get(&fqdn) else { return; };
handle.stream_sinks.clone()
};
let _ = remove_stream_sink_by_store(store, stream_id).await;
@@ -697,3 +914,11 @@ fn sanitize_label(input: &str) -> String {
.trim_matches('-')
.to_ascii_lowercase()
}
fn guess_advertise_addr(bind: &str) -> String {
if let Some((_host, port)) = bind.rsplit_once(':') {
format!("127.0.0.1:{port}")
} else {
"127.0.0.1:7001".to_string()
}
}