openethereum/util/src/migration/db_impl.rs
Marek Kotewicz 7370776af1 Bloomchain (#1014)
* use bloomchain crate in blockchain module. remove obsole chainfilter submodule

* update database version to 6.0

* removed redundant line

* simple db migration

* make migration slightly more functional

* bloomchain migration

* migration version is just a single unsigned integer

* updated migration v6

* parity migration

* db migration

* removed hardcoded migration dir

* replace ptr::copy with clone_from_slice, removed potential endianess problem from trace/db.rs

* removed superfluous line

* blockchains log blooms config is not exposed any more
2016-05-26 18:24:51 +02:00

56 lines
1.6 KiB
Rust

// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! `kvdb::Database` as `migration::Destination`
use std::collections::BTreeMap;
use kvdb::{Database, DatabaseIterator, DBTransaction};
use migration::{Destination, Error};
/// Database iterator with `Item` complient with migration `Manager` interface.
pub struct MigrationIterator {
iter: DatabaseIterator,
}
impl From<DatabaseIterator> for MigrationIterator {
fn from(iter: DatabaseIterator) -> Self {
MigrationIterator {
iter: iter
}
}
}
impl Iterator for MigrationIterator {
type Item = (Vec<u8>, Vec<u8>);
fn next(&mut self) -> Option<Self::Item> {
self.iter.next().map(|(k, v)| (k.to_vec(), v.to_vec()))
}
}
impl Destination for Database {
fn commit(&mut self, batch: BTreeMap<Vec<u8>, Vec<u8>>) -> Result<(), Error> {
let transaction = DBTransaction::new();
for keypair in &batch {
try!(transaction.put(&keypair.0, &keypair.1).map_err(Error::Custom))
}
self.write(transaction).map_err(Error::Custom)
}
}