openethereum/secret_store/src/trusted_client.rs

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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/>.
use std::sync::{Arc, Weak};
use bytes::Bytes;
use ethereum_types::Address;
use ethcore::client::{Client, BlockChainClient, ChainInfo, Nonce};
use ethcore::miner::{Miner, MinerService};
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use ethsync::SyncProvider;
use transaction::{Transaction, SignedTransaction, Action};
use {Error, NodeKeyPair};
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#[derive(Clone)]
/// 'Trusted' client weak reference.
pub struct TrustedClient {
/// This key server node key pair.
self_key_pair: Arc<NodeKeyPair>,
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/// Blockchain client.
client: Weak<Client>,
/// Sync provider.
sync: Weak<SyncProvider>,
/// Miner service.
miner: Weak<Miner>,
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}
impl TrustedClient {
/// Create new trusted client.
pub fn new(self_key_pair: Arc<NodeKeyPair>, client: Arc<Client>, sync: Arc<SyncProvider>, miner: Arc<Miner>) -> Self {
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TrustedClient {
self_key_pair: self_key_pair,
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client: Arc::downgrade(&client),
sync: Arc::downgrade(&sync),
miner: Arc::downgrade(&miner),
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}
}
/// Get 'trusted' `Client` reference only if it is synchronized && trusted.
pub fn get(&self) -> Option<Arc<Client>> {
self.client.upgrade()
.and_then(|client| self.sync.upgrade().map(|sync| (client, sync)))
.and_then(|(client, sync)| {
let is_synced = !sync.status().is_syncing(client.queue_info());
let is_trusted = client.chain_info().security_level().is_full();
match is_synced && is_trusted {
true => Some(client),
false => None,
}
})
}
/// Get untrusted `Client` reference.
pub fn get_untrusted(&self) -> Option<Arc<Client>> {
self.client.upgrade()
}
/// Transact contract.
pub fn transact_contract(&self, contract: Address, tx_data: Bytes) -> Result<(), Error> {
let client = self.client.upgrade().ok_or_else(|| Error::Internal("cannot submit tx when client is offline".into()))?;
let miner = self.miner.upgrade().ok_or_else(|| Error::Internal("cannot submit tx when miner is offline".into()))?;
let engine = client.engine();
let transaction = Transaction {
nonce: client.latest_nonce(&self.self_key_pair.address()),
action: Action::Call(contract),
gas: miner.gas_floor_target(),
gas_price: miner.sensible_gas_price(),
value: Default::default(),
data: tx_data,
};
let chain_id = engine.signing_chain_id(&client.latest_env_info());
let signature = self.self_key_pair.sign(&transaction.hash(chain_id))?;
let signed = SignedTransaction::new(transaction.with_signature(signature, chain_id))?;
miner.import_own_transaction(&*client, signed.into())
.map_err(|e| Error::Internal(format!("failed to import tx: {}", e)))
.map(|_| ())
}
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}