openethereum/ethcore/light/src/client.rs

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// 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/>.
//! Light client implementation. Used for raw data queries as well as the header
//! sync.
use std::sync::Arc;
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use ethcore::engines::Engine;
use ethcore::ids::BlockID;
use ethcore::service::ClientIoMessage;
use ethcore::block_import_error::BlockImportError;
use ethcore::block_status::BlockStatus;
use ethcore::verification::queue::{HeaderQueue, QueueInfo};
use ethcore::transaction::SignedTransaction;
use ethcore::blockchain_info::BlockChainInfo;
use io::IoChannel;
use util::hash::H256;
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use util::{Bytes, Mutex};
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use provider::Provider;
use request;
/// Light client implementation.
pub struct Client {
engine: Arc<Engine>,
header_queue: HeaderQueue,
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message_channel: Mutex<IoChannel<ClientIoMessage>>,
}
impl Client {
/// Import a header as rlp-encoded bytes.
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pub fn import_header(&self, bytes: Bytes) -> Result<H256, BlockImportError> {
let header = ::rlp::decode(&bytes);
self.header_queue.import(header).map_err(Into::into)
}
/// Whether the block is already known (but not necessarily part of the canonical chain)
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pub fn is_known(&self, _id: BlockID) -> bool {
false
}
/// Fetch a vector of all pending transactions.
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pub fn pending_transactions(&self) -> Vec<SignedTransaction> {
vec![]
}
/// Inquire about the status of a given block.
pub fn status(&self, _id: BlockID) -> BlockStatus {
BlockStatus::Unknown
}
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/// Get the header queue info.
pub fn queue_info(&self) -> QueueInfo {
self.header_queue.queue_info()
}
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}
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// dummy implementation -- may draw from canonical cache further on.
impl Provider for Client {
fn chain_info(&self) -> BlockChainInfo {
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unimplemented!()
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}
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fn reorg_depth(&self, _a: &H256, _b: &H256) -> Option<u64> {
None
}
fn earliest_state(&self) -> Option<u64> {
None
}
fn block_headers(&self, _req: request::Headers) -> Vec<Bytes> {
Vec::new()
}
fn block_bodies(&self, _req: request::Bodies) -> Vec<Bytes> {
Vec::new()
}
fn receipts(&self, _req: request::Receipts) -> Vec<Bytes> {
Vec::new()
}
fn proofs(&self, _req: request::StateProofs) -> Vec<Bytes> {
Vec::new()
}
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fn contract_code(&self, _req: request::ContractCodes) -> Vec<Bytes> {
Vec::new()
}
fn header_proofs(&self, _req: request::HeaderProofs) -> Vec<Bytes> {
Vec::new()
}
fn pending_transactions(&self) -> Vec<SignedTransaction> {
Vec::new()
}
}