src/garage/admin.rs

@@ -5,6 +5,7 @@ use std::sync::Arc;
 use async_trait::async_trait;
 use serde::{Deserialize, Serialize};
 
+use garage_util::background::*;
 use garage_util::crdt::*;
 use garage_util::data::*;
 use garage_util::error::Error as GarageError;
@@ -36,6 +37,7 @@ pub enum AdminRpc {
 	LaunchRepair(RepairOpt),
 	Migrate(MigrateOpt),
 	Stats(StatsOpt),
+	Worker(WorkerOpt),
 
 	// Replies
 	Ok(String),
@@ -47,6 +49,7 @@ pub enum AdminRpc {
 	},
 	KeyList(Vec<(String, String)>),
 	KeyInfo(Key, HashMap<Uuid, Bucket>),
+	WorkerList(HashMap<usize, garage_util::background::WorkerInfo>),
 }
 
 impl Rpc for AdminRpc {
@@ -822,6 +825,25 @@ impl AdminRpcHandler {
 
 		Ok(())
 	}
+
+	// ----
+
+	async fn handle_worker_cmd(&self, opt: WorkerOpt) -> Result<AdminRpc, Error> {
+		match opt.cmd {
+			WorkerCmd::List { busy } => {
+				let workers = self.garage.background.get_worker_info();
+				let workers = if busy {
+					workers
+						.into_iter()
+						.filter(|(_, w)| w.status == WorkerStatus::Busy)
+						.collect()
+				} else {
+					workers
+				};
+				Ok(AdminRpc::WorkerList(workers))
+			}
+		}
+	}
 }
 
 #[async_trait]
@@ -837,6 +859,7 @@ impl EndpointHandler<AdminRpc> for AdminRpcHandler {
 			AdminRpc::Migrate(opt) => self.handle_migrate(opt.clone()).await,
 			AdminRpc::LaunchRepair(opt) => self.handle_launch_repair(opt.clone()).await,
 			AdminRpc::Stats(opt) => self.handle_stats(opt.clone()).await,
+			AdminRpc::Worker(opt) => self.handle_worker_cmd(opt.clone()).await,
 			m => Err(GarageError::unexpected_rpc_message(m).into()),
 		}
 	}

src/garage/cli/cmd.rs

@@ -39,6 +39,7 @@ pub async fn cli_command_dispatch(
 			cmd_admin(admin_rpc_endpoint, rpc_host, AdminRpc::LaunchRepair(ro)).await
 		}
 		Command::Stats(so) => cmd_admin(admin_rpc_endpoint, rpc_host, AdminRpc::Stats(so)).await,
+		Command::Worker(wo) => cmd_admin(admin_rpc_endpoint, rpc_host, AdminRpc::Worker(wo)).await,
 		_ => unreachable!(),
 	}
 }
@@ -182,6 +183,9 @@ pub async fn cmd_admin(
 		AdminRpc::KeyInfo(key, rb) => {
 			print_key_info(&key, &rb);
 		}
+		AdminRpc::WorkerList(wi) => {
+			print_worker_info(wi);
+		}
 		r => {
 			error!("Unexpected response: {:?}", r);
 		}

src/garage/cli/structs.rs

@@ -45,6 +45,10 @@ pub enum Command {
 	/// Gather node statistics
 	#[structopt(name = "stats")]
 	Stats(StatsOpt),
+
+	/// Manage background workers
+	#[structopt(name = "worker")]
+	Worker(WorkerOpt),
 }
 
 #[derive(StructOpt, Debug)]
@@ -460,3 +464,20 @@ pub struct StatsOpt {
 	#[structopt(short = "d", long = "detailed")]
 	pub detailed: bool,
 }
+
+#[derive(Serialize, Deserialize, StructOpt, Debug, Clone)]
+pub struct WorkerOpt {
+	#[structopt(subcommand)]
+	pub cmd: WorkerCmd,
+}
+
+#[derive(Serialize, Deserialize, StructOpt, Debug, Eq, PartialEq, Clone)]
+pub enum WorkerCmd {
+	/// List all workers on Garage node
+	#[structopt(name = "list")]
+	List {
+		/// Show only busy workers
+		#[structopt(short = "b", long = "busy")]
+		busy: bool,
+	},
+}

src/garage/cli/util.rs

@@ -1,5 +1,6 @@
 use std::collections::HashMap;
 
+use garage_util::background::*;
 use garage_util::crdt::*;
 use garage_util::data::Uuid;
 use garage_util::error::*;
@@ -235,3 +236,26 @@ pub fn find_matching_node(
 		Ok(candidates[0])
 	}
 }
+
+pub fn print_worker_info(wi: HashMap<usize, WorkerInfo>) {
+	let mut wi = wi.into_iter().collect::<Vec<_>>();
+	wi.sort_by_key(|(tid, info)| {
+		(
+			match info.status {
+				WorkerStatus::Busy => 0,
+				WorkerStatus::Idle => 1,
+				WorkerStatus::Done => 2,
+			},
+			*tid,
+		)
+	});
+
+	let mut table = vec![];
+	for (tid, info) in wi.iter() {
+		table.push(format!("{}\t{:?}\t{}", tid, info.status, info.name));
+		if let Some(i) = &info.info {
+			table.push(format!("\t\t{}", i));
+		}
+	}
+	format_table(table);
+}

src/table/gc.rs

@@ -332,7 +332,16 @@ where
 	R: TableReplication + 'static,
 {
 	fn name(&self) -> String {
-		format!("Table GC: {}", F::TABLE_NAME)
+		format!("{} GC", F::TABLE_NAME)
+	}
+
+	fn info(&self) -> Option<String> {
+		let l = self.gc.data.gc_todo_len().unwrap_or(0);
+		if l > 0 {
+			Some(format!("{} items in queue", l))
+		} else {
+			None
+		}
 	}
 
 	async fn work(

src/table/merkle.rs

@@ -310,7 +310,16 @@ where
 	R: TableReplication + 'static,
 {
 	fn name(&self) -> String {
-		format!("Merkle tree updater: {}", F::TABLE_NAME)
+		format!("{} Merkle tree updater", F::TABLE_NAME)
+	}
+
+	fn info(&self) -> Option<String> {
+		let l = self.0.todo_len().unwrap_or(0);
+		if l > 0 {
+			Some(format!("{} items in queue", l))
+		} else {
+			None
+		}
 	}
 
 	async fn work(

src/table/sync.rs

@@ -574,7 +574,16 @@ impl<F: TableSchema + 'static, R: TableReplication + 'static> SyncWorker<F, R> {
 #[async_trait]
 impl<F: TableSchema + 'static, R: TableReplication + 'static> Worker for SyncWorker<F, R> {
 	fn name(&self) -> String {
-		format!("Table sync worker for {}", F::TABLE_NAME)
+		format!("{} sync", F::TABLE_NAME)
+	}
+
+	fn info(&self) -> Option<String> {
+		let l = self.todo.len();
+		if l > 0 {
+			Some(format!("{} partitions remaining", l))
+		} else {
+			None
+		}
 	}
 
 	async fn work(&mut self, must_exit: &mut watch::Receiver<bool>) -> Result<WorkerStatus, Error> {

src/util/background/mod.rs

@@ -4,9 +4,12 @@ pub mod job_worker;
 pub mod worker;
 
 use core::future::Future;
+
+use std::collections::HashMap;
 use std::pin::Pin;
 use std::sync::Arc;
 
+use serde::{Deserialize, Serialize};
 use tokio::sync::{mpsc, watch, Mutex};
 
 use crate::error::Error;
@@ -20,6 +23,14 @@ pub(crate) type Job = Pin<Box<dyn Future<Output = JobOutput> + Send>>;
 pub struct BackgroundRunner {
 	send_job: mpsc::UnboundedSender<(Job, bool)>,
 	send_worker: mpsc::UnboundedSender<Box<dyn Worker>>,
+	worker_info: Arc<std::sync::Mutex<HashMap<usize, WorkerInfo>>>,
+}
+
+#[derive(Clone, Serialize, Deserialize, Debug)]
+pub struct WorkerInfo {
+	pub name: String,
+	pub info: Option<String>,
+	pub status: WorkerStatus,
 }
 
 impl BackgroundRunner {
@@ -30,8 +41,13 @@ impl BackgroundRunner {
 	) -> (Arc<Self>, tokio::task::JoinHandle<()>) {
 		let (send_worker, worker_out) = mpsc::unbounded_channel::<Box<dyn Worker>>();
 
-		let await_all_done =
+		let worker_info = Arc::new(std::sync::Mutex::new(HashMap::new()));
-			tokio::spawn(async move { WorkerProcessor::new(worker_out, stop_signal).run().await });
+		let mut worker_processor =
+			WorkerProcessor::new(worker_out, stop_signal, worker_info.clone());
+
+		let await_all_done = tokio::spawn(async move {
+			worker_processor.run().await;
+		});
 
 		let (send_job, queue_out) = mpsc::unbounded_channel();
 		let queue_out = Arc::new(Mutex::new(queue_out));
@@ -52,10 +68,15 @@ impl BackgroundRunner {
 		let bgrunner = Arc::new(Self {
 			send_job,
 			send_worker,
+			worker_info,
 		});
 		(bgrunner, await_all_done)
 	}
 
+	pub fn get_worker_info(&self) -> HashMap<usize, WorkerInfo> {
+		self.worker_info.lock().unwrap().clone()
+	}
+
 	/// Spawn a task to be run in background
 	pub fn spawn<T>(&self, job: T)
 	where

src/util/background/worker.rs

@@ -1,16 +1,20 @@
+use std::collections::HashMap;
+use std::sync::Arc;
 use std::time::{Duration, Instant};
 
 use async_trait::async_trait;
 use futures::future::*;
 use futures::stream::FuturesUnordered;
 use futures::StreamExt;
+use serde::{Deserialize, Serialize};
 use tokio::select;
 use tokio::sync::{mpsc, watch};
 use tracing::*;
 
+use crate::background::WorkerInfo;
 use crate::error::Error;
 
-#[derive(PartialEq, Copy, Clone, Debug)]
+#[derive(PartialEq, Copy, Clone, Debug, Serialize, Deserialize)]
 pub enum WorkerStatus {
 	Busy,
 	Idle,
@@ -21,6 +25,10 @@ pub enum WorkerStatus {
 pub trait Worker: Send {
 	fn name(&self) -> String;
 
+	fn info(&self) -> Option<String> {
+		None
+	}
+
 	/// Work: do a basic unit of work, if one is available (otherwise, should return
 	/// WorkerStatus::Idle immediately).  We will do our best to not interrupt this future in the
 	/// middle of processing, it will only be interrupted at the last minute when Garage is trying
@@ -39,16 +47,19 @@ pub trait Worker: Send {
 pub(crate) struct WorkerProcessor {
 	stop_signal: watch::Receiver<bool>,
 	worker_chan: mpsc::UnboundedReceiver<Box<dyn Worker>>,
+	worker_info: Arc<std::sync::Mutex<HashMap<usize, WorkerInfo>>>,
 }
 
 impl WorkerProcessor {
 	pub(crate) fn new(
 		worker_chan: mpsc::UnboundedReceiver<Box<dyn Worker>>,
 		stop_signal: watch::Receiver<bool>,
+		worker_info: Arc<std::sync::Mutex<HashMap<usize, WorkerInfo>>>,
 	) -> Self {
 		Self {
 			stop_signal,
 			worker_chan,
+			worker_info,
 		}
 	}
 
@@ -87,6 +98,20 @@ impl WorkerProcessor {
 				worker = await_next_worker => {
 					if let Some(mut worker) = worker {
 						trace!("{} (TID {}): {:?}", worker.worker.name(), worker.task_id, worker.status);
+						let mut wi = self.worker_info.lock().unwrap();
+						match wi.get_mut(&worker.task_id) {
+							Some(i) => {
+								i.status = worker.status;
+								i.info = worker.worker.info();
+							}
+							None => {
+								wi.insert(worker.task_id, WorkerInfo {
+									name: worker.worker.name(),
+									status: worker.status,
+									info: worker.worker.info(),
+								});
+							}
+						}
 						// TODO save new worker status somewhere
 						if worker.status == WorkerStatus::Done {
 							info!("Worker {} (TID {}) exited", worker.worker.name(), worker.task_id);