proxy request timeout

Author: MarinPostma

Cargo.lock

@@ -17,6 +17,7 @@ color-eyre = "0.6.2"
 either = "1.8.1"
 futures = "0.3.28"
 hmac = "0.12.1"
+humantime = "2.1.0"
 hyper = { version = "0.14.27", features = ["h2", "server"] }
 itertools = "0.11.0"
 libsqlx = { version = "0.1.0", path = "../libsqlx", features = ["tokio"] }
@@ -30,6 +31,7 @@ serde_json = "1.0.100"
 sha2 = "0.10.7"
 sha3 = "0.10.8"
 sled = "0.34.7"
+tempfile = "3.6.0"
 thiserror = "1.0.43"
 tokio = { version = "1.29.1", features = ["full"] }
 tokio-stream = "0.1.14"

libsqlx-server/Cargo.toml

@@ -1,3 +1,5 @@
+use std::time::Duration;
+
 use serde::{Deserialize, Serialize};
 
 use crate::linc::NodeId;
@@ -19,5 +21,8 @@ pub struct AllocConfig {
 #[derive(Debug, Serialize, Deserialize)]
 pub enum DbConfig {
     Primary {},
-    Replica { primary_node_id: NodeId },
+    Replica {
+        primary_node_id: NodeId,
+        proxy_request_timeout_duration: Duration,
+    },
 }

libsqlx-server/src/allocation/config.rs

@@ -1,13 +1,17 @@
 use std::collections::hash_map::Entry;
 use std::collections::HashMap;
+use std::future::poll_fn;
 use std::mem::size_of;
 use std::ops::Deref;
 use std::path::PathBuf;
+use std::pin::Pin;
 use std::sync::Arc;
+use std::task::{Context, Poll};
 use std::time::{Duration, Instant};
 
 use bytes::Bytes;
 use either::Either;
+use futures::Future;
 use libsqlx::libsql::{LibsqlDatabase, LogCompactor, LogFile, PrimaryType, ReplicaType};
 use libsqlx::program::Program;
 use libsqlx::proxy::{WriteProxyConnection, WriteProxyDatabase};
@@ -19,12 +23,12 @@ use libsqlx::{
 use parking_lot::Mutex;
 use tokio::sync::{mpsc, oneshot};
 use tokio::task::{block_in_place, JoinSet};
-use tokio::time::timeout;
+use tokio::time::{timeout, Sleep};
 
 use crate::hrana;
 use crate::hrana::http::handle_pipeline;
 use crate::hrana::http::proto::{PipelineRequestBody, PipelineResponseBody};
-use crate::linc::bus::{Dispatch};
+use crate::linc::bus::Dispatch;
 use crate::linc::proto::{
     BuilderStep, Enveloppe, Frames, Message, ProxyResponse, StepError, Value,
 };
@@ -50,7 +54,9 @@ pub enum AllocationMessage {
     Inbound(Inbound),
 }
 
-pub struct RemoteDb;
+pub struct RemoteDb {
+    proxy_request_timeout_duration: Duration,
+}
 
 #[derive(Clone)]
 pub struct RemoteConn {
@@ -62,10 +68,12 @@ struct Request {
     builder: Box<dyn ResultBuilder>,
     pgm: Option<Program>,
     next_seq_no: u32,
+    timeout: Pin<Box<Sleep>>,
 }
 
 pub struct RemoteConnInner {
     current_req: Mutex<Option<Request>>,
+    request_timeout_duration: Duration,
 }
 
 impl Deref for RemoteConn {
@@ -93,6 +101,7 @@ impl libsqlx::Connection for RemoteConn {
                 builder,
                 pgm: Some(program.clone()),
                 next_seq_no: 0,
+                timeout: Box::pin(tokio::time::sleep(self.inner.request_timeout_duration)),
             }),
         };
 
@@ -111,6 +120,7 @@ impl libsqlx::Database for RemoteDb {
         Ok(RemoteConn {
             inner: Arc::new(RemoteConnInner {
                 current_req: Default::default(),
+                request_timeout_duration: self.proxy_request_timeout_duration,
             }),
         })
     }
@@ -462,9 +472,14 @@ impl Database {
                     frame_notifier: receiver,
                 })
             }
-            DbConfig::Replica { primary_node_id } => {
+            DbConfig::Replica {
+                primary_node_id,
+                proxy_request_timeout_duration,
+            } => {
                 let rdb = LibsqlDatabase::new_replica(path, MAX_INJECTOR_BUFFER_CAP, ()).unwrap();
-                let wdb = RemoteDb;
+                let wdb = RemoteDb {
+                    proxy_request_timeout_duration,
+                };
                 let mut db = WriteProxyDatabase::new(rdb, wdb, Arc::new(|_| ()));
                 let injector = db.injector().unwrap();
                 let (sender, receiver) = mpsc::channel(16);
@@ -502,7 +517,7 @@ impl Database {
                 conn: db.connect().unwrap(),
                 connection_id,
                 next_req_id: 0,
-                primary_id: *primary_id,
+                primary_node_id: *primary_id,
                 database_id: DatabaseId::from_name(&alloc.db_name),
                 dispatcher: alloc.dispatcher.clone(),
             }),
@@ -520,8 +535,8 @@ struct PrimaryConnection {
 
 #[async_trait::async_trait]
 impl ConnectionHandler for PrimaryConnection {
-    fn exec_ready(&self) -> bool {
-        true
+    fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<()> {
+        Poll::Ready(())
     }
 
     async fn handle_exec(&mut self, exec: ExecFn) {
@@ -537,7 +552,7 @@ struct ReplicaConnection {
     conn: ProxyConnection,
     connection_id: u32,
     next_req_id: u32,
-    primary_id: NodeId,
+    primary_node_id: NodeId,
     database_id: DatabaseId,
     dispatcher: Arc<dyn Dispatch>,
 }
@@ -551,16 +566,21 @@ impl ReplicaConnection {
                 // TODO: pass actual config
                 let config = QueryBuilderConfig { max_size: None };
                 let mut finnalized = false;
-                for step in resp.row_steps.iter() {
-                    if finnalized { break };
+                for step in resp.row_steps.into_iter() {
+                    if finnalized {
+                        break;
+                    };
                     match step {
                         BuilderStep::Init => req.builder.init(&config).unwrap(),
                         BuilderStep::BeginStep => req.builder.begin_step().unwrap(),
                         BuilderStep::FinishStep(affected_row_count, last_insert_rowid) => req
                             .builder
-                            .finish_step(*affected_row_count, *last_insert_rowid)
+                            .finish_step(affected_row_count, last_insert_rowid)
+                            .unwrap(),
+                        BuilderStep::StepError(e) => req
+                            .builder
+                            .step_error(todo!("handle proxy step error"))
                             .unwrap(),
-                        BuilderStep::StepError(e) => req.builder.step_error(todo!()).unwrap(),
                         BuilderStep::ColsDesc(cols) => req
                             .builder
                             .cols_description(&mut cols.iter().map(|c| Column {
@@ -570,11 +590,15 @@ impl ReplicaConnection {
                             .unwrap(),
                         BuilderStep::BeginRows => req.builder.begin_rows().unwrap(),
                         BuilderStep::BeginRow => req.builder.begin_row().unwrap(),
-                        BuilderStep::AddRowValue(v) => req.builder.add_row_value(v.into()).unwrap(),
+                        BuilderStep::AddRowValue(v) => req.builder.add_row_value((&v).into()).unwrap(),
                         BuilderStep::FinishRow => req.builder.finish_row().unwrap(),
                         BuilderStep::FinishRows => req.builder.finish_rows().unwrap(),
                         BuilderStep::Finnalize { is_txn, frame_no } => {
-                            let _ = req.builder.finnalize(*is_txn, *frame_no).unwrap();
+                            let _ = req.builder.finnalize(is_txn, frame_no).unwrap();
+                            finnalized = true;
+                        },
+                        BuilderStep::FinnalizeError(e) => { 
+                            req.builder.finnalize_error(e);
                             finnalized = true;
                         }
                     }
@@ -596,9 +620,28 @@ impl ReplicaConnection {
 
 #[async_trait::async_trait]
 impl ConnectionHandler for ReplicaConnection {
-    fn exec_ready(&self) -> bool {
+    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<()> {
         // we are currently handling a request on this connection
-        self.conn.writer().current_req.lock().is_none()
+        // self.conn.writer().current_req.timeout.poll()
+        let mut req = self.conn.writer().current_req.lock();
+        let should_abort_query = match &mut *req {
+            Some(ref mut req) => {
+                match req.timeout.as_mut().poll(cx) {
+                    Poll::Ready(_) => {
+                        req.builder.finnalize_error("request timed out".to_string());
+                        true
+                    }
+                    Poll::Pending => return Poll::Pending,
+                }
+            }
+            None => return Poll::Ready(()),
+        };
+
+        if should_abort_query {
+            *req = None
+        }
+
+        Poll::Ready(())
     }
 
     async fn handle_exec(&mut self, exec: ExecFn) {
@@ -616,7 +659,7 @@ impl ConnectionHandler for ReplicaConnection {
                     req.id = Some(req_id);
 
                     let msg = Outbound {
-                        to: self.primary_id,
+                        to: self.primary_node_id,
                         enveloppe: Enveloppe {
                             database_id: Some(self.database_id),
                             message: Message::ProxyRequest {
@@ -654,10 +697,10 @@ where
     L: ConnectionHandler,
     R: ConnectionHandler,
 {
-    fn exec_ready(&self) -> bool {
+    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<()> {
         match self {
-            Either::Left(l) => l.exec_ready(),
-            Either::Right(r) => r.exec_ready(),
+            Either::Left(l) => l.poll_ready(cx),
+            Either::Right(r) => r.poll_ready(cx),
         }
     }
 
@@ -852,7 +895,7 @@ impl Allocation {
                     };
                     conn.execute_program(&program, Box::new(builder)).unwrap();
                 })
-            .await;
+                .await;
         };
 
         if self.database.is_primary() {
@@ -921,19 +964,21 @@ struct Connection<C> {
 
 #[async_trait::async_trait]
 trait ConnectionHandler: Send {
-    fn exec_ready(&self) -> bool;
+    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<()>;
     async fn handle_exec(&mut self, exec: ExecFn);
     async fn handle_inbound(&mut self, msg: Inbound);
 }
 
 impl<C: ConnectionHandler> Connection<C> {
     async fn run(mut self) -> (NodeId, u32) {
         loop {
+            let fut =
+                futures::future::join(self.exec.recv(), poll_fn(|cx| self.conn.poll_ready(cx)));
             tokio::select! {
                 Some(inbound) = self.inbound.recv() => {
                     self.conn.handle_inbound(inbound).await;
                 }
-                Some(exec) = self.exec.recv(), if self.conn.exec_ready() => {
+                (Some(exec), _) = fut => {
                     self.conn.handle_exec(exec).await;
                 },
                 else => break,
@@ -943,3 +988,65 @@ impl<C: ConnectionHandler> Connection<C> {
         self.id
     }
 }
+
+#[cfg(test)]
+mod test {
+    use tokio::sync::Notify;
+
+    use crate::linc::bus::Bus;
+
+    use super::*;
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    async fn proxy_request_timeout() {
+        let bus = Arc::new(Bus::new(0, |_, _| async {}));
+        let _queue = bus.connect(1); // pretend connection to node 1
+        let tmp = tempfile::TempDir::new().unwrap();
+        let read_db = LibsqlDatabase::new_replica(tmp.path().to_path_buf(), 1, ()).unwrap();
+        let write_db = RemoteDb {
+            proxy_request_timeout_duration: Duration::from_millis(100),
+        };
+        let db = WriteProxyDatabase::new(read_db, write_db, Arc::new(|_| ()));
+        let conn = db.connect().unwrap();
+        let conn = ReplicaConnection {
+            conn,
+            connection_id: 0,
+            next_req_id: 0,
+            primary_node_id: 1,
+            database_id: DatabaseId::random(),
+            dispatcher: bus,
+        };
+
+        let (exec_sender, exec) = mpsc::channel(1);
+        let (_inbound_sender, inbound) = mpsc::channel(1);
+        let connection = Connection {
+            id: (0, 0),
+            conn,
+            exec,
+            inbound,
+        };
+
+        let handle = tokio::spawn(connection.run());
+
+        let notify = Arc::new(Notify::new());
+        struct Builder(Arc<Notify>);
+        impl ResultBuilder for Builder {
+            fn finnalize_error(&mut self, _e: String) {
+                self.0.notify_waiters()
+            }
+        }
+
+        let builder = Box::new(Builder(notify.clone()));
+        exec_sender
+            .send(Box::new(move |conn| {
+                conn.execute_program(&Program::seq(&["create table test (c)"]), builder)
+                    .unwrap();
+            }))
+            .await
+            .unwrap();
+
+        notify.notified().await;
+
+        handle.abort();
+    }
+}

libsqlx-server/src/allocation/mod.rs

@@ -76,6 +76,10 @@ impl ResultBuilder for SingleStatementBuilder {
         let _ = self.ret.take().unwrap().send(res);
         Ok(true)
     }
+
+    fn finnalize_error(&mut self, _e: String) {
+        todo!()
+    }
 }
 
 #[derive(Debug, Default)]
@@ -354,4 +358,8 @@ impl ResultBuilder for HranaBatchProtoBuilder {
     fn add_row_value(&mut self, v: ValueRef) -> Result<(), QueryResultBuilderError> {
         self.stmt_builder.add_row_value(v)
     }
+
+    fn finnalize_error(&mut self, _e: String) {
+        todo!()
+    }
 }