feat: make tls certificates/keys reloadable (part 1) (GreptimeTeam#3335)

* feat: make tls certificates/keys reloadable (part 1)

* feat: add notify watcher for cert/key files

* test: add unit test for watcher

* fix: correct usage of watcher

* fix: skip watch when tls disabled

src/frontend/src/server.rs

@@ -18,7 +18,6 @@ use std::sync::Arc;
 use auth::UserProviderRef;
 use common_base::Plugins;
 use common_runtime::Builder as RuntimeBuilder;
-use servers::error::InternalIoSnafu;
 use servers::grpc::builder::GrpcServerBuilder;
 use servers::grpc::greptime_handler::GreptimeRequestHandler;
 use servers::grpc::{GrpcServer, GrpcServerConfig};
@@ -30,6 +29,7 @@ use servers::postgres::PostgresServer;
 use servers::query_handler::grpc::ServerGrpcQueryHandlerAdapter;
 use servers::query_handler::sql::ServerSqlQueryHandlerAdapter;
 use servers::server::{Server, ServerHandlers};
+use servers::tls::{watch_tls_config, ReloadableTlsServerConfig};
 use snafu::ResultExt;
 
 use crate::error::{self, Result, StartServerSnafu};
@@ -195,6 +195,12 @@ where
             let opts = &opts.mysql;
             let mysql_addr = parse_addr(&opts.addr)?;
 
+            let tls_server_config = Arc::new(
+                ReloadableTlsServerConfig::try_new(opts.tls.clone()).context(StartServerSnafu)?,
+            );
+
+            watch_tls_config(tls_server_config.clone()).context(StartServerSnafu)?;
+
             let mysql_io_runtime = Arc::new(
                 RuntimeBuilder::default()
                     .worker_threads(opts.runtime_size)
@@ -210,11 +216,7 @@ where
                 )),
                 Arc::new(MysqlSpawnConfig::new(
                     opts.tls.should_force_tls(),
-                    opts.tls
-                        .setup()
-                        .context(InternalIoSnafu)
-                        .context(StartServerSnafu)?
-                        .map(Arc::new),
+                    tls_server_config,
                     opts.reject_no_database.unwrap_or(false),
                 )),
             );
@@ -226,6 +228,12 @@ where
             let opts = &opts.postgres;
             let pg_addr = parse_addr(&opts.addr)?;
 
+            let tls_server_config = Arc::new(
+                ReloadableTlsServerConfig::try_new(opts.tls.clone()).context(StartServerSnafu)?,
+            );
+
+            watch_tls_config(tls_server_config.clone()).context(StartServerSnafu)?;
+
             let pg_io_runtime = Arc::new(
                 RuntimeBuilder::default()
                     .worker_threads(opts.runtime_size)
@@ -236,7 +244,8 @@ where
 
             let pg_server = Box::new(PostgresServer::new(
                 ServerSqlQueryHandlerAdapter::arc(instance.clone()),
-                opts.tls.clone(),
+                opts.tls.should_force_tls(),
+                tls_server_config,
                 pg_io_runtime,
                 user_provider.clone(),
             )) as Box<dyn Server>;

src/servers/Cargo.toml

@@ -59,6 +59,7 @@ influxdb_line_protocol = { git = "https://github.com/evenyag/influxdb_iox", bran
 itertools.workspace = true
 lazy_static.workspace = true
 mime_guess = "2.0"
+notify = "6.1"
 once_cell.workspace = true
 openmetrics-parser = "0.4"
 opensrv-mysql = "0.7.0"
@@ -121,6 +122,7 @@ script = { workspace = true, features = ["python"] }
 serde_json.workspace = true
 session = { workspace = true, features = ["testing"] }
 table.workspace = true
+tempfile = "3.0.0"
 tokio-postgres = "0.7"
 tokio-postgres-rustls = "0.11"
 tokio-test = "0.4"

src/servers/src/error.rs

@@ -441,6 +441,12 @@ pub enum Error {
         "Invalid parameter, physical_table is not expected when metric engine is disabled"
     ))]
     UnexpectedPhysicalTable { location: Location },
+
+    #[snafu(display("Failed to initialize a watcher for file"))]
+    FileWatch {
+        #[snafu(source)]
+        error: notify::Error,
+    },
 }
 
 pub type Result<T> = std::result::Result<T, Error>;
@@ -462,7 +468,8 @@ impl ErrorExt for Error {
             | CatalogError { .. }
             | GrpcReflectionService { .. }
             | BuildHttpResponse { .. }
-            | Arrow { .. } => StatusCode::Internal,
+            | Arrow { .. }
+            | FileWatch { .. } => StatusCode::Internal,
 
             UnsupportedDataType { .. } => StatusCode::Unsupported,
 

src/servers/src/mysql/server.rs

@@ -33,6 +33,7 @@ use crate::error::{Error, Result};
 use crate::mysql::handler::MysqlInstanceShim;
 use crate::query_handler::sql::ServerSqlQueryHandlerRef;
 use crate::server::{AbortableStream, BaseTcpServer, Server};
+use crate::tls::ReloadableTlsServerConfig;
 
 // Default size of ResultSet write buffer: 100KB
 const DEFAULT_RESULT_SET_WRITE_BUFFER_SIZE: usize = 100 * 1024;
@@ -68,15 +69,15 @@ impl MysqlSpawnRef {
 pub struct MysqlSpawnConfig {
     // tls config
     force_tls: bool,
-    tls: Option<Arc<ServerConfig>>,
+    tls: Arc<ReloadableTlsServerConfig>,
     // other shim config
     reject_no_database: bool,
 }
 
 impl MysqlSpawnConfig {
     pub fn new(
         force_tls: bool,
-        tls: Option<Arc<ServerConfig>>,
+        tls: Arc<ReloadableTlsServerConfig>,
         reject_no_database: bool,
     ) -> MysqlSpawnConfig {
         MysqlSpawnConfig {
@@ -87,7 +88,7 @@ impl MysqlSpawnConfig {
     }
 
     fn tls(&self) -> Option<Arc<ServerConfig>> {
-        self.tls.clone()
+        self.tls.get_server_config()
     }
 }
 

src/servers/src/postgres/server.rs

@@ -29,47 +29,52 @@ use super::{MakePostgresServerHandler, MakePostgresServerHandlerBuilder};
 use crate::error::Result;
 use crate::query_handler::sql::ServerSqlQueryHandlerRef;
 use crate::server::{AbortableStream, BaseTcpServer, Server};
-use crate::tls::TlsOption;
+use crate::tls::ReloadableTlsServerConfig;
 
 pub struct PostgresServer {
     base_server: BaseTcpServer,
     make_handler: Arc<MakePostgresServerHandler>,
-    tls: TlsOption,
+    tls_server_config: Arc<ReloadableTlsServerConfig>,
 }
 
 impl PostgresServer {
     /// Creates a new Postgres server with provided query_handler and async runtime
     pub fn new(
         query_handler: ServerSqlQueryHandlerRef,
-        tls: TlsOption,
+        force_tls: bool,
+        tls_server_config: Arc<ReloadableTlsServerConfig>,
         io_runtime: Arc<Runtime>,
         user_provider: Option<UserProviderRef>,
     ) -> PostgresServer {
         let make_handler = Arc::new(
             MakePostgresServerHandlerBuilder::default()
                 .query_handler(query_handler.clone())
                 .user_provider(user_provider.clone())
-                .force_tls(tls.should_force_tls())
+                .force_tls(force_tls)
                 .build()
                 .unwrap(),
         );
         PostgresServer {
             base_server: BaseTcpServer::create_server("Postgres", io_runtime),
             make_handler,
-            tls,
+            tls_server_config,
         }
     }
 
     fn accept(
         &self,
         io_runtime: Arc<Runtime>,
         accepting_stream: AbortableStream,
-        tls_acceptor: Option<Arc<TlsAcceptor>>,
     ) -> impl Future<Output = ()> {
         let handler_maker = self.make_handler.clone();
+        let tls_server_config = self.tls_server_config.clone();
         accepting_stream.for_each(move |tcp_stream| {
             let io_runtime = io_runtime.clone();
-            let tls_acceptor = tls_acceptor.clone();
+
+            let tls_acceptor = tls_server_config
+                .get_server_config()
+                .map(|server_config| Arc::new(TlsAcceptor::from(server_config)));
+
             let handler_maker = handler_maker.clone();
 
             async move {
@@ -119,14 +124,8 @@ impl Server for PostgresServer {
     async fn start(&self, listening: SocketAddr) -> Result<SocketAddr> {
         let (stream, addr) = self.base_server.bind(listening).await?;
 
-        debug!("Starting PostgreSQL with TLS option: {:?}", self.tls);
-        let tls_acceptor = self
-            .tls
-            .setup()?
-            .map(|server_conf| Arc::new(TlsAcceptor::from(Arc::new(server_conf))));
-
         let io_runtime = self.base_server.io_runtime();
-        let join_handle = common_runtime::spawn_read(self.accept(io_runtime, stream, tls_acceptor));
+        let join_handle = common_runtime::spawn_read(self.accept(io_runtime, stream));
 
         self.base_server.start_with(join_handle).await?;
         Ok(addr)