78 lines
2.6 KiB
Rust
78 lines
2.6 KiB
Rust
// Copyright 2015-2018 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 futures::{Future, future, IntoFuture};
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use ethabi::{Address, Bytes};
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use std::sync::Arc;
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use keccak_hash::keccak;
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use_contract!(registry, "Registry", "res/registrar.json");
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// Maps a domain name to an Ethereum address
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const DNS_A_RECORD: &'static str = "A";
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pub type Asynchronous = Box<Future<Item=Bytes, Error=String> + Send>;
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pub type Synchronous = Result<Bytes, String>;
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/// Registrar is dedicated interface to access the registrar contract
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/// which in turn generates an address when a client requests one
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pub struct Registrar {
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registrar: registry::Registry,
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client: Arc<RegistrarClient<Call=Asynchronous>>,
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}
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impl Registrar {
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/// Registrar constructor
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pub fn new(client: Arc<RegistrarClient<Call=Asynchronous>>) -> Self {
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Self {
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registrar: registry::Registry::default(),
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client: client,
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}
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}
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/// Generate an address for the given key
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pub fn get_address<'a>(&self, key: &'a str) -> Box<Future<Item = Address, Error = String> + Send> {
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// Address of the registrar itself
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let registrar_address = match self.client.registrar_address() {
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Ok(a) => a,
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Err(e) => return Box::new(future::err(e)),
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};
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let address_fetcher = self.registrar.functions().get_address();
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let hashed_key: [u8; 32] = keccak(key).into();
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let id = address_fetcher.input(hashed_key, DNS_A_RECORD);
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let future = self.client.call_contract(registrar_address, id).and_then(move |address| {
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address_fetcher.output(&address)
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}
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.map_err(|e| e.to_string()));
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Box::new(future)
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}
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}
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/// Registrar contract interface
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/// Should execute transaction using current blockchain state.
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pub trait RegistrarClient: Send + Sync {
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/// Specifies synchronous or asynchronous communication
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type Call: IntoFuture<Item=Bytes, Error=String>;
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/// Get registrar address
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fn registrar_address(&self) -> Result<Address, String>;
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/// Call Contract
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fn call_contract(&self, address: Address, data: Bytes) -> Self::Call;
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}
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