Serialize blocktree writes by locking the database (#4008)

Move several private methods to free functions

core/src/blocktree/db.rs

@@ -9,7 +9,6 @@ use std::borrow::Borrow;
 use std::collections::HashMap;
 use std::marker::PhantomData;
 use std::path::Path;
-use std::sync::Arc;
 
 pub mod columns {
     #[derive(Debug)]
@@ -133,7 +132,7 @@ where
     B: Backend,
     C: Column<B>,
 {
-    pub db: Arc<Database<B>>,
+    backend: PhantomData<B>,
     column: PhantomData<C>,
 }
 
@@ -171,7 +170,7 @@ where
             .get_cf(self.cf_handle::<C>(), C::key(key).borrow())
     }
 
-    pub fn put_bytes<C>(&self, key: C::Index, data: &[u8]) -> Result<()>
+    pub fn put_bytes<C>(&mut self, key: C::Index, data: &[u8]) -> Result<()>
     where
         C: Column<B>,
     {
@@ -179,7 +178,7 @@ where
             .put_cf(self.cf_handle::<C>(), C::key(key).borrow(), data)
     }
 
-    pub fn delete<C>(&self, key: C::Index) -> Result<()>
+    pub fn delete<C>(&mut self, key: C::Index) -> Result<()>
     where
         C: Column<B>,
     {
@@ -203,7 +202,7 @@ where
         }
     }
 
-    pub fn put<C>(&self, key: C::Index, value: &C::Type) -> Result<()>
+    pub fn put<C>(&mut self, key: C::Index, value: &C::Type) -> Result<()>
     where
         C: TypedColumn<B>,
     {
@@ -241,7 +240,7 @@ where
         Ok(iter)
     }
 
-    pub fn batch(&self) -> Result<WriteBatch<B>> {
+    pub fn batch(&mut self) -> Result<WriteBatch<B>> {
         let db_write_batch = self.backend.batch()?;
         let map = self
             .backend
@@ -257,7 +256,7 @@ where
         })
     }
 
-    pub fn write(&self, batch: WriteBatch<B>) -> Result<()> {
+    pub fn write(&mut self, batch: WriteBatch<B>) -> Result<()> {
         self.backend.write(batch.write_batch)
     }
 
@@ -268,6 +267,16 @@ where
     {
         self.backend.cf_handle(C::NAME).clone()
     }
+
+    pub fn column<C>(&self) -> LedgerColumn<B, C>
+    where
+        C: Column<B>,
+    {
+        LedgerColumn {
+            backend: PhantomData,
+            column: PhantomData,
+        }
+    }
 }
 
 impl<B, C> Cursor<B, C>
@@ -324,43 +333,24 @@ where
     B: Backend,
     C: Column<B>,
 {
-    pub fn new(db: &Arc<Database<B>>) -> Self {
-        LedgerColumn {
-            db: Arc::clone(db),
-            column: PhantomData,
-        }
+    pub fn get_bytes(&self, db: &Database<B>, key: C::Index) -> Result<Option<Vec<u8>>> {
+        db.backend.get_cf(self.handle(db), C::key(key).borrow())
     }
 
-    pub fn put_bytes(&self, key: C::Index, value: &[u8]) -> Result<()> {
-        self.db
-            .backend
-            .put_cf(self.handle(), C::key(key).borrow(), value)
+    pub fn cursor(&self, db: &Database<B>) -> Result<Cursor<B, C>> {
+        db.cursor()
     }
 
-    pub fn get_bytes(&self, key: C::Index) -> Result<Option<Vec<u8>>> {
-        self.db.backend.get_cf(self.handle(), C::key(key).borrow())
+    pub fn iter(&self, db: &Database<B>) -> Result<impl Iterator<Item = (C::Index, Vec<u8>)>> {
+        db.iter::<C>()
     }
 
-    pub fn delete(&self, key: C::Index) -> Result<()> {
-        self.db
-            .backend
-            .delete_cf(self.handle(), C::key(key).borrow())
+    pub fn handle(&self, db: &Database<B>) -> B::ColumnFamily {
+        db.cf_handle::<C>()
     }
 
-    pub fn cursor(&self) -> Result<Cursor<B, C>> {
-        self.db.cursor()
-    }
-
-    pub fn iter(&self) -> Result<impl Iterator<Item = (C::Index, Vec<u8>)>> {
-        self.db.iter::<C>()
-    }
-
-    pub fn handle(&self) -> B::ColumnFamily {
-        self.db.cf_handle::<C>()
-    }
-
-    pub fn is_empty(&self) -> Result<bool> {
-        let mut cursor = self.cursor()?;
+    pub fn is_empty(&self, db: &Database<B>) -> Result<bool> {
+        let mut cursor = self.cursor(db)?;
         cursor.seek_to_first();
         Ok(!cursor.valid())
     }
@@ -369,14 +359,35 @@ where
 impl<B, C> LedgerColumn<B, C>
 where
     B: Backend,
-    C: TypedColumn<B>,
+    C: Column<B>,
 {
-    pub fn put(&self, key: C::Index, value: &C::Type) -> Result<()> {
-        self.db.put::<C>(key, value)
+    pub fn put_bytes(&self, db: &mut Database<B>, key: C::Index, value: &[u8]) -> Result<()> {
+        db.backend
+            .put_cf(self.handle(db), C::key(key).borrow(), value)
     }
 
-    pub fn get(&self, key: C::Index) -> Result<Option<C::Type>> {
-        self.db.get::<C>(key)
+    pub fn delete(&self, db: &mut Database<B>, key: C::Index) -> Result<()> {
+        db.backend.delete_cf(self.handle(db), C::key(key).borrow())
+    }
+}
+
+impl<B, C> LedgerColumn<B, C>
+where
+    B: Backend,
+    C: TypedColumn<B>,
+{
+    pub fn get(&self, db: &Database<B>, key: C::Index) -> Result<Option<C::Type>> {
+        db.get::<C>(key)
+    }
+}
+
+impl<B, C> LedgerColumn<B, C>
+where
+    B: Backend,
+    C: TypedColumn<B>,
+{
+    pub fn put(&self, db: &mut Database<B>, key: C::Index, value: &C::Type) -> Result<()> {
+        db.put::<C>(key, value)
     }
 }