Refactoring on repair commands

src/garage/cli/structs.rs

@@ -265,7 +265,7 @@ pub struct RepairOpt {
 	pub yes: bool,
 
 	#[structopt(subcommand)]
-	pub what: Option<RepairWhat>,
+	pub what: RepairWhat,
 }
 
 #[derive(Serialize, Deserialize, StructOpt, Debug, Eq, PartialEq, Clone)]
@@ -283,8 +283,8 @@ pub enum RepairWhat {
 	#[structopt(name = "block_refs")]
 	BlockRefs,
 	/// Verify integrity of all blocks on disc (extremely slow, i/o intensive)
-	#[structopt(name = "blocks_integrity")]
-	BlockIntegrity {
+	#[structopt(name = "scrub")]
+	Scrub {
 		/// Limit on i/o speed, in B/s
 		#[structopt(name = "limit")]
 		limit: Option<usize>,

src/garage/repair.rs

@@ -27,9 +27,8 @@ impl Repair {
 		opt: RepairOpt,
 		must_exit: watch::Receiver<bool>,
 	) -> Result<(), Error> {
-		let todo = |x| opt.what.as_ref().map(|y| *y == x).unwrap_or(true);
-
-		if todo(RepairWhat::Tables) {
+		match opt.what {
+			RepairWhat::Tables => {
 				info!("Launching a full sync of tables");
 				self.garage.bucket_table.syncer.add_full_sync();
 				self.garage.object_table.syncer.add_full_sync();
@@ -37,40 +36,29 @@ impl Repair {
 				self.garage.block_ref_table.syncer.add_full_sync();
 				self.garage.key_table.syncer.add_full_sync();
 			}
-
-		// TODO: wait for full sync to finish before proceeding to the rest?
-
-		if todo(RepairWhat::Versions) {
+			RepairWhat::Versions => {
 				info!("Repairing the versions table");
 				self.repair_versions(&must_exit).await?;
 			}
-
-		if todo(RepairWhat::BlockRefs) {
+			RepairWhat::BlockRefs => {
 				info!("Repairing the block refs table");
 				self.repair_block_ref(&must_exit).await?;
 			}
-
-		if opt.what.is_none() {
-			info!("Repairing the RC");
-			self.repair_rc(&must_exit).await?;
-		}
-
-		if todo(RepairWhat::Blocks) {
+			RepairWhat::Blocks => {
 				info!("Repairing the stored blocks");
 				self.garage
 					.block_manager
 					.repair_data_store(&must_exit)
 					.await?;
 			}
-
-		if let Some(RepairWhat::BlockIntegrity { limit }) = opt.what {
+			RepairWhat::Scrub { limit } => {
 				info!("Verifying integrity of stored blocks");
 				self.garage
 					.block_manager
-				.verify_data_store_integrity(&must_exit, limit)
+					.scrub_data_store(&must_exit, limit)
 					.await?;
 			}
-
+		}
 		Ok(())
 	}
 
@@ -158,10 +146,4 @@ impl Repair {
 		}
 		Ok(())
 	}
-
-	async fn repair_rc(&self, _must_exit: &watch::Receiver<bool>) -> Result<(), Error> {
-		// TODO
-		warn!("repair_rc: not implemented");
-		Ok(())
-	}
 }

src/model/block.rs

@@ -10,11 +10,11 @@ use serde::{Deserialize, Serialize};
 use tokio::fs;
 use tokio::io::{AsyncReadExt, AsyncWriteExt};
 use tokio::sync::{watch, Mutex, Notify};
-use tokio::time::Instant;
 
 use garage_util::data::*;
 use garage_util::error::Error;
 use garage_util::time::*;
+use garage_util::token_bucket::TokenBucket;
 
 use garage_rpc::system::System;
 use garage_rpc::*;
@@ -209,6 +209,35 @@ impl BlockManager {
 		.await
 	}
 
+	/// Verify integrity of each block on disk. Use `speed_limit` to limit the load generated by
+	/// this function.
+	pub async fn scrub_data_store(
+		&self,
+		must_exit: &watch::Receiver<bool>,
+		speed_limit: Option<usize>,
+	) -> Result<(), Error> {
+		let token_bucket = speed_limit.map(|rate| TokenBucket::new(rate as u64));
+		self.for_each_file(
+			token_bucket,
+			move |mut token_bucket, hash| {
+				async move {
+					let len = match self.read_block(&hash).await {
+						Ok(BlockRpc::PutBlock(PutBlockMessage { data, .. })) => data.len(),
+						Ok(_) => unreachable!(),
+						Err(_) => 0, // resync and warn message made by read_block if necessary
+					};
+
+					if let Some(tb) = &mut token_bucket {
+						tb.take(len as u64).await;
+					}
+					Ok(token_bucket)
+				}
+			},
+			must_exit,
+		)
+		.await
+	}
+
 	/// Get lenght of resync queue
 	pub fn resync_queue_len(&self) -> usize {
 		self.resync_queue.len()
@@ -553,45 +582,6 @@ impl BlockManager {
 		}
 		.boxed()
 	}
-
-	/// Verify integrity of each block on disk. Use `speed_limit` to limit the load generated by
-	/// this function.
-	pub async fn verify_data_store_integrity(
-		&self,
-		must_exit: &watch::Receiver<bool>,
-		speed_limit: Option<usize>,
-	) -> Result<(), Error> {
-		let last_refill = Instant::now();
-		let token_left = speed_limit.unwrap_or(0);
-		self.for_each_file(
-			(last_refill, token_left),
-			move |(last_refill, token_left), hash| {
-				async move {
-					let len = match self.read_block(&hash).await {
-						Ok(BlockRpc::PutBlock(PutBlockMessage { data, .. })) => data.len(),
-						Ok(_) => unreachable!(),
-						Err(_) => 0, // resync and warn message made by read_block if necessary
-					};
-
-					if let Some(speed_limit) = speed_limit {
-						// throttling logic
-						if let Some(t) = token_left.checked_sub(len) {
-							// token bucket not empty yet
-							Ok((last_refill, t))
-						} else {
-							// token bucket empty. Sleep and refill
-							tokio::time::sleep_until(last_refill + Duration::from_secs(1)).await;
-							Ok((Instant::now(), speed_limit))
-						}
-					} else {
-						Ok((last_refill, token_left)) // actually not used
-					}
-				}
-			},
-			must_exit,
-		)
-		.await
-	}
 }
 
 #[async_trait]

src/util/lib.rs

@@ -9,3 +9,4 @@ pub mod data;
 pub mod error;
 pub mod persister;
 pub mod time;
+pub mod token_bucket;

src/util/token_bucket.rs

@@ -0,0 +1,40 @@
+use std::time::{Duration, Instant};
+
+use tokio::time::sleep;
+
+pub struct TokenBucket {
+	// Replenish rate: number of tokens per second
+	replenish_rate: u64,
+	// Current number of tokens
+	tokens: u64,
+	// Last replenish time
+	last_replenish: Instant,
+}
+
+impl TokenBucket {
+	pub fn new(replenish_rate: u64) -> Self {
+		Self {
+			replenish_rate,
+			tokens: 0,
+			last_replenish: Instant::now(),
+		}
+	}
+
+	pub async fn take(&mut self, tokens: u64) {
+		while self.tokens < tokens {
+			let needed = tokens - self.tokens;
+			let delay = (needed as f64) / (self.replenish_rate as f64);
+			sleep(Duration::from_secs_f64(delay)).await;
+			self.replenish();
+		}
+		self.tokens -= tokens;
+	}
+
+	pub fn replenish(&mut self) {
+		let now = Instant::now();
+		let new_tokens =
+			((now - self.last_replenish).as_secs_f64() * (self.replenish_rate as f64)) as u64;
+		self.tokens += new_tokens;
+		self.last_replenish = now;
+	}
+}