[pve-devel] [PATCH proxmox-backup v2 1/5] restore-daemon: start disk initialization in parallel to the api

[Dominik Csapak <d.csapak@proxmox.com>]

this way, the vm can start up faster, and the actual disk init happens
in parallel. this avoids unnecessary timeouts when starting the vm

if the call panics, we still abort the vm with an error

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
---
 proxmox-restore-daemon/src/main.rs | 31 ++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/proxmox-restore-daemon/src/main.rs b/proxmox-restore-daemon/src/main.rs
index 8f479de9..96e40de9 100644
--- a/proxmox-restore-daemon/src/main.rs
+++ b/proxmox-restore-daemon/src/main.rs
@@ -36,6 +36,15 @@ lazy_static! {
     };
 }
 
+fn init_disk_state() {
+    info!("scanning all disks...");
+    {
+        let _disk_state = DISK_STATE.lock().unwrap();
+    }
+
+    info!("disk scan complete.")
+}
+
 /// This is expected to be run by 'proxmox-file-restore' within a mini-VM
 fn main() -> Result<(), Error> {
     pbs_tools::setup_libc_malloc_opts();
@@ -56,15 +65,6 @@ fn main() -> Result<(), Error> {
     info!("setup basic system environment...");
     setup_system_env().map_err(|err| format_err!("system environment setup failed: {}", err))?;
 
-    // scan all attached disks now, before starting the API
-    // this will panic and stop the VM if anything goes wrong
-    info!("scanning all disks...");
-    {
-        let _disk_state = DISK_STATE.lock().unwrap();
-    }
-
-    info!("disk scan complete, starting main runtime...");
-
     proxmox_async::runtime::main(run())
 }
 
@@ -95,6 +95,13 @@ fn setup_system_env() -> Result<(), Error> {
 async fn run() -> Result<(), Error> {
     watchdog_init();
 
+    let init_future = async move {
+        match tokio::time::timeout(std::time::Duration::from_secs(120), tokio::task::spawn_blocking(init_disk_state)).await {
+            Ok(res) => res.map_err(|err| format_err!("disk init failed: {}", err)),
+            Err(_) => bail!("disk init timed out after 120 seconds"),
+        }
+    };
+
     let adaptor = StaticAuthAdapter::new()
         .map_err(|err| format_err!("reading ticket file failed: {}", err))?;
 
@@ -106,7 +113,11 @@ async fn run() -> Result<(), Error> {
     let receiver_stream = ReceiverStream::new(connections);
     let acceptor = hyper::server::accept::from_stream(receiver_stream);
 
-    hyper::Server::builder(acceptor).serve(rest_server).await?;
+    let hyper_future = async move {
+        hyper::Server::builder(acceptor).serve(rest_server).await.map_err(|err| format_err!("hyper finished with error: {}", err))
+    };
+
+    tokio::try_join!(init_future, hyper_future)?;
 
     bail!("hyper server exited");
 }
-- 
2.30.2