Flush chunk pointers in one transaction

yama/src/pile/local_sqlitebloblogs.rs

@@ -28,7 +28,7 @@ use anyhow::{bail, Context};
 use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
 use log::{info, warn};
 use nix::unistd::sync;
-use rusqlite::{params, Error, ErrorCode};
+use rusqlite::{params, Error, ErrorCode, Transaction};
 use rusqlite::{Connection, OptionalExtension};
 
 use crate::definitions::ChunkId;
@@ -145,14 +145,13 @@ pub struct Inner {
     queued_pointer_writes: HashMap<ChunkId, BloblogPointer>,
 }
 
-impl Inner {
-    pub fn raw_put_chunk_pointer(
-        &self,
+fn raw_put_chunk_pointer_txn(
+    txn: &Transaction,
     chunk_id: &ChunkId,
     bloblog: BloblogId,
     offset_i64: i64,
 ) -> anyhow::Result<()> {
-        match self.connection.execute(
+    match txn.execute(
         "INSERT INTO chunks (chunk_id, bloblog, offset) VALUES (?1, ?2, ?3)",
         params![&chunk_id[..], bloblog, offset_i64],
     ) {
@@ -165,27 +164,41 @@ impl Inner {
                 );
                 Ok(())
             } else {
-                    Err(Error::SqliteFailure(e, str))?;
-                    unreachable!();
+                Err(Error::SqliteFailure(e, str).into())
             }
         }
-            other => {
-                other?;
-                unreachable!();
+        Err(other) => Err(other.into()),
     }
 }
+
+impl Inner {
+    pub fn raw_put_chunk_pointer(
+        &mut self,
+        chunk_id: &ChunkId,
+        bloblog: BloblogId,
+        offset_i64: i64,
+    ) -> anyhow::Result<()> {
+        let txn = self.connection.transaction()?;
+        raw_put_chunk_pointer_txn(&txn, chunk_id, bloblog, offset_i64)?;
+        txn.commit()?;
+        Ok(())
     }
 
     pub fn flush(&mut self) -> anyhow::Result<()> {
         // Create a non-allocated hashmap to satisfy borrow checker, then swap it in and out
         let mut queued_pointer_writes = HashMap::with_capacity(0);
         std::mem::swap(&mut self.queued_pointer_writes, &mut queued_pointer_writes);
+
+        let txn = self.connection.transaction()?;
+
         for (chunk_id, pointer) in queued_pointer_writes.drain() {
             let offset_i64 =
                 i64::try_from(pointer.offset).expect("ouch! can't turn u64 into i64...");
-            self.raw_put_chunk_pointer(&chunk_id, pointer.bloblog, offset_i64)?;
+            raw_put_chunk_pointer_txn(&txn, &chunk_id, pointer.bloblog, offset_i64)?;
         }
         std::mem::swap(&mut self.queued_pointer_writes, &mut queued_pointer_writes);
+
+        txn.commit()?;
         Ok(())
     }
 }
@@ -355,7 +368,7 @@ impl SqliteBloblogPile {
     }
 
     fn put_chunk_pointer(&self, chunk_id: &ChunkId, pointer: BloblogPointer) -> anyhow::Result<()> {
-        let inner = self.inner.lock().unwrap();
+        let mut inner = self.inner.lock().unwrap();
         let offset_i64 = i64::try_from(pointer.offset).expect("ouch! can't turn u64 into i64...");
         inner.raw_put_chunk_pointer(chunk_id, pointer.bloblog, offset_i64)
     }