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    // Copyright 2015-2017 Parity Technologies (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/>.

    //! Bloom upgrade

    use std::sync::Arc;
    use db::{COL_EXTRA, COL_HEADERS, COL_STATE};
    use state_db::{ACCOUNT_BLOOM_SPACE, DEFAULT_ACCOUNT_PRESET, StateDB};
    use util::trie::TrieDB;
    use views::HeaderView;
    use bloom_journal::Bloom;
    use util::migration::{Error, Migration, Progress, Batch, Config};
    use util::journaldb;
    use util::{H256, FixedHash, Trie};
    use util::{Database, DBTransaction};

    /// Account bloom upgrade routine. If bloom already present, does nothing.
    /// If database empty (no best block), does nothing.
    /// Can be called on upgraded database with no issues (will do nothing).
    pub fn generate_bloom(source: Arc<Database>, dest: &mut Database) -> Result<(), Error> {
    	trace!(target: "migration", "Account bloom upgrade started");
    	let best_block_hash = match source.get(COL_EXTRA, b"best")? {
    		// no migration needed
    		None => {
    			trace!(target: "migration", "No best block hash, skipping");
    			return Ok(());
    		},
    		Some(hash) => hash,
    	};
    	let best_block_header = match source.get(COL_HEADERS, &best_block_hash)? {
    		// no best block, nothing to do
    		None => {
    			trace!(target: "migration", "No best block header, skipping");
    			return Ok(())
    		},
    		Some(x) => x,
    	};
    	let state_root = HeaderView::new(&best_block_header).state_root();

    	trace!("Adding accounts bloom (one-time upgrade)");
    	let bloom_journal = {
    		let mut bloom = Bloom::new(ACCOUNT_BLOOM_SPACE, DEFAULT_ACCOUNT_PRESET);
    		// no difference what algorithm is passed, since there will be no writes
    		let state_db = journaldb::new(
    			source.clone(),
    			journaldb::Algorithm::OverlayRecent,
    			COL_STATE);
    		let account_trie = TrieDB::new(state_db.as_hashdb(), &state_root).map_err(|e| Error::Custom(format!("Cannot open trie: {:?}", e)))?;
    		for item in account_trie.iter().map_err(|_| Error::MigrationImpossible)? {
    			let (ref account_key, _) = item.map_err(|_| Error::MigrationImpossible)?;
    			let account_key_hash = H256::from_slice(account_key);
    			bloom.set(&*account_key_hash);
    		}

    		bloom.drain_journal()
    	};

    	trace!(target: "migration", "Generated {} bloom updates", bloom_journal.entries.len());

    	let mut batch = DBTransaction::new(dest);
    	StateDB::commit_bloom(&mut batch, bloom_journal).map_err(|_| Error::Custom("Failed to commit bloom".to_owned()))?;
    	dest.write(batch)?;

    	trace!(target: "migration", "Finished bloom update");

    	Ok(())
    }

    /// Account bloom migration.
    #[derive(Default)]
    pub struct ToV10 {
    	progress: Progress,
    }

    impl ToV10 {
    	/// New v10 migration
    	pub fn new() -> ToV10 { ToV10 { progress: Progress::default() } }
    }

    impl Migration for ToV10 {
    	fn version(&self) -> u32 {
    		10
    	}

    	fn pre_columns(&self) -> Option<u32> { Some(5) }

    	fn columns(&self) -> Option<u32> { Some(6) }

    	fn migrate(&mut self, source: Arc<Database>, config: &Config, dest: &mut Database, col: Option<u32>) -> Result<(), Error> {
    		let mut batch = Batch::new(config, col);
    		for (key, value) in source.iter(col) {
    			self.progress.tick();
    			batch.insert(key.to_vec(), value.to_vec(), dest)?;
    		}
    		batch.commit(dest)?;

    		if col == COL_STATE {
    			generate_bloom(source, dest)?;
    		}

    		Ok(())
    	}
    }

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