Allow configuring served components per listener

book/changelog.md

@@ -246,3 +246,5 @@ This will be the first release of Grapevine since it was forked from Conduit
 18. Added admin commands to delete media
     ([!99](https://gitlab.computer.surgery/matrix/grapevine/-/merge_requests/99),
     [!102](https://gitlab.computer.surgery/matrix/grapevine/-/merge_requests/102))
+19. Allow configuring the served API components per listener.
+    ([!109](https://gitlab.computer.surgery/matrix/grapevine/-/merge_requests/109))

src/cli/serve.rs

@@ -1,4 +1,7 @@
-use std::{future::Future, net::SocketAddr, sync::atomic, time::Duration};
+use std::{
+    collections::HashSet, future::Future, net::SocketAddr, sync::atomic,
+    time::Duration,
+};
 
 use axum::{
     extract::{DefaultBodyLimit, FromRequestParts, MatchedPath},
@@ -38,7 +41,7 @@ use crate::{
         server_server, well_known,
     },
     config,
-    config::{Config, ListenConfig},
+    config::{Config, ListenComponent, ListenTransport},
     database::KeyValueDatabase,
     error, observability, services, utils,
     utils::error::{Error, Result},
@@ -148,7 +151,6 @@ async fn run_server() -> Result<(), error::Serve> {
         ))
         .layer(axum::middleware::from_fn(observability::http_metrics_layer));
 
-    let app = routes(config).layer(middlewares).into_make_service();
     let mut handles = Vec::new();
     let mut servers = JoinSet::new();
 
@@ -170,25 +172,29 @@ async fn run_server() -> Result<(), error::Serve> {
 
     for listen in &config.listen {
         info!(listener = %listen, "Listening for incoming traffic");
-        match listen {
-            ListenConfig::Tcp {
+        let app = routes(config, &listen.components)
+            .layer(middlewares.clone())
+            .into_make_service();
+
+        match listen.transport {
+            ListenTransport::Tcp {
                 address,
                 port,
                 tls,
             } => {
-                let addr = SocketAddr::from((*address, *port));
+                let addr = SocketAddr::from((address, port));
                 let handle = ServerHandle::new();
                 handles.push(handle.clone());
-                let server = if *tls {
+                let server = if tls {
                     let tls_config = tls_config
                         .clone()
                         .ok_or_else(|| Error::NoTlsCerts(listen.clone()))?;
                     bind_rustls(addr, tls_config)
                         .handle(handle)
-                        .serve(app.clone())
+                        .serve(app)
                         .left_future()
                 } else {
-                    bind(addr).handle(handle).serve(app.clone()).right_future()
+                    bind(addr).handle(handle).serve(app).right_future()
                 };
                 servers.spawn(
                     server.then(|result| async { (listen.clone(), result) }),
@@ -493,15 +499,24 @@ fn well_known_routes() -> Router {
         .route("/.well-known/matrix/server", get(well_known::server))
 }
 
-fn routes(config: &Config) -> Router {
-    Router::new()
-        .merge(client_routes())
-        .merge(federation_routes(config))
-        .merge(legacy_media_routes(config))
-        .merge(well_known_routes())
-        .merge(metrics_routes(config))
-        .route("/", get(it_works))
-        .fallback(not_found)
+fn routes(config: &Config, components: &HashSet<ListenComponent>) -> Router {
+    let mut router = Router::new();
+    for &component in components {
+        router = router.merge(match component {
+            ListenComponent::Client => client_routes(),
+            ListenComponent::Federation => federation_routes(config),
+            ListenComponent::Metrics => metrics_routes(config),
+            ListenComponent::WellKnown => well_known_routes(),
+        });
+    }
+
+    if components.contains(&ListenComponent::Client)
+        || components.contains(&ListenComponent::Federation)
+    {
+        router = router.merge(legacy_media_routes(config));
+    }
+
+    router.route("/", get(it_works)).fallback(not_found)
 }
 
 async fn shutdown_signal(handles: Vec<ServerHandle>) {

src/config.rs

@@ -1,6 +1,6 @@
 use std::{
     borrow::Cow,
-    collections::BTreeMap,
+    collections::{BTreeMap, HashSet},
     fmt::{self, Display},
     net::{IpAddr, Ipv4Addr},
     path::{Path, PathBuf},
@@ -13,6 +13,7 @@ use ruma::{
     OwnedServerSigningKeyId, RoomVersionId,
 };
 use serde::Deserialize;
+use strum::{Display, EnumIter, IntoEnumIterator};
 
 use crate::error;
 
@@ -108,9 +109,27 @@ pub(crate) struct TlsConfig {
     pub(crate) key: String,
 }
 
+#[derive(
+    Debug, Clone, Copy, PartialEq, Eq, Hash, Deserialize, EnumIter, Display,
+)]
+#[serde(rename_all = "snake_case")]
+#[strum(serialize_all = "snake_case")]
+pub(crate) enum ListenComponent {
+    Client,
+    Federation,
+    Metrics,
+    WellKnown,
+}
+
+impl ListenComponent {
+    fn all_components() -> HashSet<Self> {
+        Self::iter().collect()
+    }
+}
+
 #[derive(Clone, Debug, Deserialize)]
 #[serde(tag = "type", rename_all = "snake_case")]
-pub(crate) enum ListenConfig {
+pub(crate) enum ListenTransport {
     Tcp {
         #[serde(default = "default_address")]
         address: IpAddr,
@@ -121,15 +140,15 @@ pub(crate) enum ListenConfig {
     },
 }
 
-impl Display for ListenConfig {
+impl Display for ListenTransport {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
-            ListenConfig::Tcp {
+            ListenTransport::Tcp {
                 address,
                 port,
                 tls: false,
             } => write!(f, "http://{address}:{port}"),
-            ListenConfig::Tcp {
+            ListenTransport::Tcp {
                 address,
                 port,
                 tls: true,
@@ -138,6 +157,29 @@ impl Display for ListenConfig {
     }
 }
 
+#[derive(Clone, Debug, Deserialize)]
+pub(crate) struct ListenConfig {
+    #[serde(default = "ListenComponent::all_components")]
+    pub(crate) components: HashSet<ListenComponent>,
+    #[serde(flatten)]
+    pub(crate) transport: ListenTransport,
+}
+
+impl Display for ListenConfig {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "{} ({})",
+            self.transport,
+            self.components
+                .iter()
+                .map(ListenComponent::to_string)
+                .collect::<Vec<_>>()
+                .join(", ")
+        )
+    }
+}
+
 #[derive(Copy, Clone, Default, Debug, Deserialize)]
 #[serde(rename_all = "snake_case")]
 pub(crate) enum LogFormat {
@@ -315,10 +357,13 @@ fn true_fn() -> bool {
 }
 
 fn default_listen() -> Vec<ListenConfig> {
-    vec![ListenConfig::Tcp {
-        address: default_address(),
-        port: default_port(),
-        tls: false,
+    vec![ListenConfig {
+        components: ListenComponent::all_components(),
+        transport: ListenTransport::Tcp {
+            address: default_address(),
+            port: default_port(),
+            tls: false,
+        },
     }]
 }