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