openethereum/parity/dapps.rs
2018-04-10 12:13:49 +02:00

319 lines
8.4 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 bytes::Bytes;
use dir::default_data_path;
use dir::helpers::replace_home;
use ethcore::client::{Client, BlockChainClient, BlockId, CallContract};
use sync::LightSync;
use futures::{Future, future, IntoFuture};
use futures_cpupool::CpuPool;
use hash_fetch::fetch::Client as FetchClient;
use registrar::{RegistrarClient, Asynchronous};
use light::client::LightChainClient;
use light::on_demand::{self, OnDemand};
use node_health::{SyncStatus, NodeHealth};
use rpc;
use rpc_apis::SignerService;
use transaction::{Transaction, Action};
use ethereum_types::Address;
#[derive(Debug, PartialEq, Clone)]
pub struct Configuration {
pub enabled: bool,
pub dapps_path: PathBuf,
pub extra_dapps: Vec<PathBuf>,
pub extra_embed_on: Vec<(String, u16)>,
pub extra_script_src: Vec<(String, u16)>,
}
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![],
extra_embed_on: vec![],
extra_script_src: vec![],
}
}
}
impl Configuration {
pub fn address(&self, address: Option<::parity_rpc::Host>) -> Option<::parity_rpc::Host> {
match self.enabled {
true => address,
false => None,
}
}
}
/// Registrar implementation of the full client.
pub struct FullRegistrar {
/// Handle to the full client.
pub client: Arc<Client>,
}
impl FullRegistrar {
pub fn new(client: Arc<Client>) -> Self {
FullRegistrar {
client,
}
}
}
impl RegistrarClient for FullRegistrar {
type Call = Asynchronous;
fn registrar_address(&self) -> Result<Address, String> {
self.client.registrar_address()
.ok_or_else(|| "Registrar not defined.".into())
}
fn call_contract(&self, address: Address, data: Bytes) -> Self::Call {
Box::new(self.client.call_contract(BlockId::Latest, address, data).into_future())
}
}
/// Registrar implementation for the light client.
pub struct LightRegistrar<T> {
/// The light client.
pub client: Arc<T>,
/// Handle to the on-demand service.
pub on_demand: Arc<OnDemand>,
/// Handle to the light network service.
pub sync: Arc<LightSync>,
}
impl<T: LightChainClient + 'static> RegistrarClient for LightRegistrar<T> {
type Call = Box<Future<Item = Bytes, Error = String> + Send>;
fn registrar_address(&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_contract(&self, address: Address, data: Bytes) -> Self::Call {
let header = self.client.best_block_header();
let env_info = self.client.env_info(BlockId::Hash(header.hash()))
.ok_or_else(|| format!("Cannot fetch env info for header {}", header.hash()));
let env_info = match env_info {
Ok(e) => e,
Err(e) => return Box::new(future::err(e)),
};
let maybe_future = self.sync.with_context(move |ctx| {
self.on_demand
.request(ctx, on_demand::request::TransactionProof {
tx: Transaction {
nonce: self.client.engine().account_start_nonce(header.number()),
action: Action::Call(address),
gas: 50_000.into(), // should be enough for all registry lookups. TODO: exponential backoff
gas_price: 0.into(),
value: 0.into(),
data: data,
}.fake_sign(Address::default()),
header: header.into(),
env_info: env_info,
engine: self.client.engine().clone(),
})
.expect("No back-references; therefore all back-refs valid; qed")
.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) => Box::new(fut),
None => Box::new(future::err("cannot query registry: network disabled".into())),
}
}
}
// TODO: light client implementation forwarding to OnDemand and waiting for future
// to resolve.
#[derive(Clone)]
pub struct Dependencies {
pub node_health: NodeHealth,
pub sync_status: Arc<SyncStatus>,
pub contract_client: Arc<RegistrarClient<Call=Asynchronous>>,
pub fetch: FetchClient,
pub pool: CpuPool,
pub signer: Arc<SignerService>,
pub ui_address: Option<(String, u16)>,
}
pub fn new(configuration: Configuration, deps: Dependencies) -> Result<Option<Middleware>, String> {
if !configuration.enabled {
return Ok(None);
}
server::dapps_middleware(
deps,
configuration.dapps_path,
configuration.extra_dapps,
rpc::DAPPS_DOMAIN,
configuration.extra_embed_on,
configuration.extra_script_src,
).map(Some)
}
pub fn new_ui(enabled: bool, deps: Dependencies) -> Result<Option<Middleware>, String> {
if !enabled {
return Ok(None);
}
server::ui_middleware(
deps,
rpc::DAPPS_DOMAIN,
).map(Some)
}
pub use self::server::{Middleware, service};
#[cfg(not(feature = "dapps"))]
mod server {
use super::Dependencies;
use std::sync::Arc;
use std::path::PathBuf;
use parity_rpc::{hyper, RequestMiddleware, RequestMiddlewareAction};
use rpc_apis;
pub struct Middleware;
impl RequestMiddleware for Middleware {
fn on_request(&self, _req: hyper::Request) -> RequestMiddlewareAction {
unreachable!()
}
}
pub fn dapps_middleware(
_deps: Dependencies,
_dapps_path: PathBuf,
_extra_dapps: Vec<PathBuf>,
_dapps_domain: &str,
_extra_embed_on: Vec<(String, u16)>,
_extra_script_src: Vec<(String, u16)>,
) -> Result<Middleware, String> {
Err("Your Parity version has been compiled without WebApps support.".into())
}
pub fn ui_middleware(
_deps: Dependencies,
_dapps_domain: &str,
) -> Result<Middleware, String> {
Err("Your Parity version has been compiled without UI support.".into())
}
pub fn service(_: &Option<Middleware>) -> Option<Arc<rpc_apis::DappsService>> {
None
}
}
#[cfg(feature = "dapps")]
mod server {
use super::Dependencies;
use std::path::PathBuf;
use std::sync::Arc;
use rpc_apis;
use parity_dapps;
pub use parity_dapps::Middleware;
pub fn dapps_middleware(
deps: Dependencies,
dapps_path: PathBuf,
extra_dapps: Vec<PathBuf>,
dapps_domain: &str,
extra_embed_on: Vec<(String, u16)>,
extra_script_src: Vec<(String, u16)>,
) -> Result<Middleware, String> {
let signer = deps.signer;
let web_proxy_tokens = Arc::new(move |token| signer.web_proxy_access_token_domain(&token));
Ok(parity_dapps::Middleware::dapps(
deps.pool,
deps.node_health,
deps.ui_address,
extra_embed_on,
extra_script_src,
dapps_path,
extra_dapps,
dapps_domain,
deps.contract_client,
deps.sync_status,
web_proxy_tokens,
deps.fetch,
))
}
pub fn ui_middleware(
deps: Dependencies,
dapps_domain: &str,
) -> Result<Middleware, String> {
Ok(parity_dapps::Middleware::ui(
deps.pool,
deps.node_health,
dapps_domain,
deps.contract_client,
deps.sync_status,
deps.fetch,
))
}
pub fn service(middleware: &Option<Middleware>) -> Option<Arc<rpc_apis::DappsService>> {
middleware.as_ref().map(|m| Arc::new(DappsServiceWrapper {
endpoints: m.endpoints().clone(),
}) as Arc<rpc_apis::DappsService>)
}
pub struct DappsServiceWrapper {
endpoints: parity_dapps::Endpoints,
}
impl rpc_apis::DappsService for DappsServiceWrapper {
fn list_dapps(&self) -> Vec<rpc_apis::LocalDapp> {
self.endpoints.list()
.into_iter()
.map(|app| rpc_apis::LocalDapp {
id: app.id.unwrap_or_else(|| "unknown".into()),
name: app.name,
description: app.description,
version: app.version,
author: app.author,
icon_url: app.icon_url,
local_url: app.local_url,
})
.collect()
}
fn refresh_local_dapps(&self) -> bool {
self.endpoints.refresh_local_dapps();
true
}
}
}