openethereum/parity/dapps.rs
Robert Habermeier b1eab698d2 Light friendly dapps (#5634)
* move native_contracts ABIs to JSON files, add urlhint

* port hash-fetch to futures, fix tests

* fix dapps compilation, defer async port to later

* activate dapps server in the light client

* better formatting
2017-05-18 12:44:09 +02:00

210 lines
5.8 KiB
Rust

// 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::path::PathBuf;
use std::sync::Arc;
use dir::default_data_path;
use ethcore::client::{Client, BlockChainClient, BlockId};
use ethcore::transaction::{Transaction, Action};
use ethsync::LightSync;
use futures::{future, IntoFuture, Future, BoxFuture};
use hash_fetch::fetch::Client as FetchClient;
use hash_fetch::urlhint::ContractClient;
use helpers::replace_home;
use light::client::Client as LightClient;
use light::on_demand::{self, OnDemand};
use rpc_apis::SignerService;
use parity_reactor;
use util::{Bytes, Address};
#[derive(Debug, PartialEq, Clone)]
pub struct Configuration {
pub enabled: bool,
pub dapps_path: PathBuf,
pub extra_dapps: Vec<PathBuf>,
}
impl Default for Configuration {
fn default() -> Self {
let data_dir = default_data_path();
Configuration {
enabled: true,
dapps_path: replace_home(&data_dir, "$BASE/dapps").into(),
extra_dapps: vec![],
}
}
}
/// Registrar implementation of the full client.
pub struct FullRegistrar {
/// Handle to the full client.
pub client: Arc<Client>,
}
impl ContractClient for FullRegistrar {
fn registrar(&self) -> Result<Address, String> {
self.client.additional_params().get("registrar")
.ok_or_else(|| "Registrar not defined.".into())
.and_then(|registrar| {
registrar.parse().map_err(|e| format!("Invalid registrar address: {:?}", e))
})
}
fn call(&self, address: Address, data: Bytes) -> BoxFuture<Bytes, String> {
self.client.call_contract(BlockId::Latest, address, data)
.into_future()
.boxed()
}
}
/// Registrar implementation for the light client.
pub struct LightRegistrar {
/// The light client.
pub client: Arc<LightClient>,
/// Handle to the on-demand service.
pub on_demand: Arc<OnDemand>,
/// Handle to the light network service.
pub sync: Arc<LightSync>,
}
impl ContractClient for LightRegistrar {
fn registrar(&self) -> Result<Address, String> {
self.client.engine().additional_params().get("registrar")
.ok_or_else(|| "Registrar not defined.".into())
.and_then(|registrar| {
registrar.parse().map_err(|e| format!("Invalid registrar address: {:?}", e))
})
}
fn call(&self, address: Address, data: Bytes) -> BoxFuture<Bytes, String> {
let (header, env_info) = (self.client.best_block_header(), self.client.latest_env_info());
let maybe_future = self.sync.with_context(move |ctx| {
self.on_demand
.transaction_proof(ctx, on_demand::request::TransactionProof {
tx: Transaction {
nonce: self.client.engine().account_start_nonce(),
action: Action::Call(address),
gas: 50_000_000.into(),
gas_price: 0.into(),
value: 0.into(),
data: data,
}.fake_sign(Address::default()),
header: header,
env_info: env_info,
engine: self.client.engine().clone(),
})
.then(|res| match res {
Ok(Ok(executed)) => Ok(executed.output),
Ok(Err(e)) => Err(format!("Failed to execute transaction: {}", e)),
Err(_) => Err(format!("On-demand service dropped request unexpectedly.")),
})
});
match maybe_future {
Some(fut) => fut.boxed(),
None => future::err("cannot query registry: network disabled".into()).boxed(),
}
}
}
// TODO: light client implementation forwarding to OnDemand and waiting for future
// to resolve.
pub struct Dependencies {
pub sync_status: Arc<SyncStatus>,
pub contract_client: Arc<ContractClient>,
pub remote: parity_reactor::TokioRemote,
pub fetch: FetchClient,
pub signer: Arc<SignerService>,
}
pub fn new(configuration: Configuration, deps: Dependencies)
-> Result<Option<Middleware>, String>
{
if !configuration.enabled {
return Ok(None);
}
dapps_middleware(
deps,
configuration.dapps_path,
configuration.extra_dapps,
).map(Some)
}
pub use self::server::{SyncStatus, Middleware, dapps_middleware};
#[cfg(not(feature = "dapps"))]
mod server {
use super::Dependencies;
use std::path::PathBuf;
use parity_rpc::{hyper, RequestMiddleware, RequestMiddlewareAction};
pub type SyncStatus = Fn() -> bool;
pub struct Middleware;
impl RequestMiddleware for Middleware {
fn on_request(
&self, _req: &hyper::server::Request<hyper::net::HttpStream>, _control: &hyper::Control
) -> RequestMiddlewareAction {
unreachable!()
}
}
pub fn dapps_middleware(
_deps: Dependencies,
_dapps_path: PathBuf,
_extra_dapps: Vec<PathBuf>,
) -> Result<Middleware, String> {
Err("Your Parity version has been compiled without WebApps support.".into())
}
}
#[cfg(feature = "dapps")]
mod server {
use super::Dependencies;
use std::path::PathBuf;
use std::sync::Arc;
use parity_dapps;
use parity_reactor;
pub use parity_dapps::Middleware;
pub use parity_dapps::SyncStatus;
pub fn dapps_middleware(
deps: Dependencies,
dapps_path: PathBuf,
extra_dapps: Vec<PathBuf>,
) -> Result<Middleware, String> {
let signer = deps.signer.clone();
let parity_remote = parity_reactor::Remote::new(deps.remote.clone());
let web_proxy_tokens = Arc::new(move |token| signer.is_valid_web_proxy_access_token(&token));
Ok(parity_dapps::Middleware::new(
parity_remote,
deps.signer.address(),
dapps_path,
extra_dapps,
deps.contract_client,
deps.sync_status,
web_proxy_tokens,
deps.fetch.clone(),
))
}
}