90 lines
3.2 KiB
Rust
90 lines
3.2 KiB
Rust
// Copyright 2015-2017 Parity Technologies (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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use std::sync::{Arc, Weak};
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use bytes::Bytes;
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use ethereum_types::Address;
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use ethcore::client::{Client, BlockChainClient, ChainInfo, Nonce};
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use ethcore::miner::{Miner, MinerService};
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use sync::SyncProvider;
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use transaction::{Transaction, SignedTransaction, Action};
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use {Error, NodeKeyPair};
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#[derive(Clone)]
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/// 'Trusted' client weak reference.
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pub struct TrustedClient {
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/// This key server node key pair.
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self_key_pair: Arc<NodeKeyPair>,
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/// Blockchain client.
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client: Weak<Client>,
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/// Sync provider.
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sync: Weak<SyncProvider>,
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/// Miner service.
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miner: Weak<Miner>,
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}
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impl TrustedClient {
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/// Create new trusted client.
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pub fn new(self_key_pair: Arc<NodeKeyPair>, client: Arc<Client>, sync: Arc<SyncProvider>, miner: Arc<Miner>) -> Self {
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TrustedClient {
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self_key_pair: self_key_pair,
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client: Arc::downgrade(&client),
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sync: Arc::downgrade(&sync),
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miner: Arc::downgrade(&miner),
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}
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}
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/// Get 'trusted' `Client` reference only if it is synchronized && trusted.
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pub fn get(&self) -> Option<Arc<Client>> {
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self.client.upgrade()
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.and_then(|client| self.sync.upgrade().map(|sync| (client, sync)))
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.and_then(|(client, sync)| {
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let is_synced = !sync.status().is_syncing(client.queue_info());
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let is_trusted = client.chain_info().security_level().is_full();
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match is_synced && is_trusted {
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true => Some(client),
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false => None,
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}
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})
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}
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/// Get untrusted `Client` reference.
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pub fn get_untrusted(&self) -> Option<Arc<Client>> {
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self.client.upgrade()
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}
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/// Transact contract.
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pub fn transact_contract(&self, contract: Address, tx_data: Bytes) -> Result<(), Error> {
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let client = self.client.upgrade().ok_or_else(|| Error::Internal("cannot submit tx when client is offline".into()))?;
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let miner = self.miner.upgrade().ok_or_else(|| Error::Internal("cannot submit tx when miner is offline".into()))?;
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let engine = client.engine();
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let transaction = Transaction {
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nonce: client.latest_nonce(&self.self_key_pair.address()),
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action: Action::Call(contract),
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gas: miner.gas_floor_target(),
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gas_price: miner.sensible_gas_price(),
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value: Default::default(),
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data: tx_data,
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};
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let chain_id = engine.signing_chain_id(&client.latest_env_info());
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let signature = self.self_key_pair.sign(&transaction.hash(chain_id))?;
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let signed = SignedTransaction::new(transaction.with_signature(signature, chain_id))?;
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miner.import_own_transaction(&*client, signed.into())
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.map_err(|e| Error::Internal(format!("failed to import tx: {}", e)))
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.map(|_| ())
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}
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}
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