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https://github.com/pezkuwichain/pezkuwi-subxt.git
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Gav
55 lines
2.2 KiB
Rust
55 lines
2.2 KiB
Rust
// Copyright 2017 Parity Technologies (UK) Ltd.
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// This file is part of Polkadot.
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// Polkadot 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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// Polkadot 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 Polkadot. If not, see <http://www.gnu.org/licenses/>.
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//! Polkadot Client data backend
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use state_machine;
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use error;
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use primitives::block;
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use blockchain::{self, BlockId};
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/// Block insertion transction. Keeps hold if the inseted block state and data.
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pub trait BlockImportOperation {
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/// Associated state backend type.
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type State: state_machine::backend::Backend;
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/// Returns pending state.
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fn state(&self) -> error::Result<Self::State>;
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/// Append block data to the transaction.
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fn import_block(&mut self, header: block::Header, body: Option<block::Body>, is_new_best: bool) -> error::Result<()>;
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/// Inject storage data into the database.
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fn reset_storage<I: Iterator<Item=(Vec<u8>, Vec<u8>)>>(&mut self, iter: I) -> error::Result<()>;
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}
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/// Client backend. Manages the data layer.
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pub trait Backend {
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/// Associated block insertion transaction type.
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type BlockImportOperation: BlockImportOperation;
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/// Associated blockchain backend type.
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type Blockchain: blockchain::Backend;
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/// Associated state backend type.
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type State: state_machine::backend::Backend;
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/// Begin a new block insertion transaction with given parent block id.
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fn begin_transaction(&self, block: BlockId) -> error::Result<Self::BlockImportOperation>;
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/// Commit block insertion.
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fn commit_transaction(&self, transaction: Self::BlockImportOperation) -> error::Result<()>;
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/// Returns reference to blockchain backend.
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fn blockchain(&self) -> &Self::Blockchain;
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/// Returns state backend for specified block.
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fn state_at(&self, block: BlockId) -> error::Result<Self::State>;
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}
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