Update overlaydb
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@ -26,7 +26,7 @@ use std::ops::*;
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use std::sync::*;
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use std::sync::*;
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use std::env;
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use std::env;
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use std::collections::HashMap;
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use std::collections::HashMap;
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use kvdb::{Database};
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use kvdb::{Database, DBTransaction};
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/// Implementation of the HashDB trait for a disk-backed database with a memory overlay.
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/// Implementation of the HashDB trait for a disk-backed database with a memory overlay.
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///
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///
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@ -36,7 +36,7 @@ use kvdb::{Database};
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///
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///
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/// `lookup()` and `contains()` maintain normal behaviour - all `insert()` and `remove()`
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/// `lookup()` and `contains()` maintain normal behaviour - all `insert()` and `remove()`
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/// queries have an immediate effect in terms of these functions.
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/// queries have an immediate effect in terms of these functions.
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//#[derive(Clone)]
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#[derive(Clone)]
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pub struct OverlayDB {
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pub struct OverlayDB {
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overlay: MemoryDB,
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overlay: MemoryDB,
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backing: Arc<Database>,
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backing: Arc<Database>,
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@ -58,6 +58,36 @@ impl OverlayDB {
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Self::new(Database::open_default(dir.to_str().unwrap()).unwrap())
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Self::new(Database::open_default(dir.to_str().unwrap()).unwrap())
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}
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}
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/// Commit all operations to given batch.
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pub fn commit_to_batch(&mut self, batch: &DBTransaction) -> Result<u32, UtilError> {
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let mut ret = 0u32;
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let mut deletes = 0usize;
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for i in self.overlay.drain().into_iter() {
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let (key, (value, rc)) = i;
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if rc != 0 {
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match self.payload(&key) {
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Some(x) => {
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let (back_value, back_rc) = x;
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let total_rc: i32 = back_rc as i32 + rc;
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if total_rc < 0 {
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return Err(From::from(BaseDataError::NegativelyReferencedHash));
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}
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deletes += if self.put_payload(batch, &key, (back_value, total_rc as u32)) {1} else {0};
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}
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None => {
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if rc < 0 {
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return Err(From::from(BaseDataError::NegativelyReferencedHash));
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}
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self.put_payload(batch, &key, (value, rc as u32));
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}
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};
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ret += 1;
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}
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}
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trace!("OverlayDB::commit() deleted {} nodes", deletes);
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Ok(ret)
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}
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/// Commit all memory operations to the backing database.
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/// Commit all memory operations to the backing database.
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///
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///
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/// Returns either an error or the number of items changed in the backing database.
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/// Returns either an error or the number of items changed in the backing database.
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@ -86,32 +116,10 @@ impl OverlayDB {
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/// }
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/// }
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/// ```
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/// ```
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pub fn commit(&mut self) -> Result<u32, UtilError> {
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pub fn commit(&mut self) -> Result<u32, UtilError> {
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let mut ret = 0u32;
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let batch = DBTransaction::new();
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let mut deletes = 0usize;
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let r = try!(self.commit_to_batch(&batch));
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for i in self.overlay.drain().into_iter() {
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try!(self.backing.write(batch));
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let (key, (value, rc)) = i;
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Ok(r)
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if rc != 0 {
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match self.payload(&key) {
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Some(x) => {
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let (back_value, back_rc) = x;
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let total_rc: i32 = back_rc as i32 + rc;
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if total_rc < 0 {
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return Err(From::from(BaseDataError::NegativelyReferencedHash));
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}
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deletes += if self.put_payload(&key, (back_value, total_rc as u32)) {1} else {0};
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}
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None => {
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if rc < 0 {
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return Err(From::from(BaseDataError::NegativelyReferencedHash));
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}
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self.put_payload(&key, (value, rc as u32));
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}
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};
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ret += 1;
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}
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}
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trace!("OverlayDB::commit() deleted {} nodes", deletes);
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Ok(ret)
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}
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}
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/// Revert all operations on this object (i.e. `insert()`s and `kill()`s) since the
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/// Revert all operations on this object (i.e. `insert()`s and `kill()`s) since the
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@ -148,15 +156,15 @@ impl OverlayDB {
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}
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}
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/// Put the refs and value of the given key, possibly deleting it from the db.
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/// Put the refs and value of the given key, possibly deleting it from the db.
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fn put_payload(&self, key: &H256, payload: (Bytes, u32)) -> bool {
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fn put_payload(&self, batch: &DBTransaction, key: &H256, payload: (Bytes, u32)) -> bool {
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if payload.1 > 0 {
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if payload.1 > 0 {
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let mut s = RlpStream::new_list(2);
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let mut s = RlpStream::new_list(2);
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s.append(&payload.1);
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s.append(&payload.1);
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s.append(&payload.0);
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s.append(&payload.0);
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self.backing.put(&key.bytes(), s.as_raw()).expect("Low-level database error. Some issue with your hard disk?");
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batch.put(&key.bytes(), s.as_raw()).expect("Low-level database error. Some issue with your hard disk?");
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false
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false
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} else {
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} else {
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self.backing.delete(&key.bytes()).expect("Low-level database error. Some issue with your hard disk?");
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batch.delete(&key.bytes()).expect("Low-level database error. Some issue with your hard disk?");
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true
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true
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}
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}
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}
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}
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