216 lines
6.5 KiB
Rust
216 lines
6.5 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;
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use hyper::{server, net, Decoder, Encoder, Next, Control};
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use hyper::method::Method;
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use hyper::status::StatusCode;
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use api::{response, types};
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use api::time::TimeChecker;
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use apps::fetcher::Fetcher;
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use handlers::{self, extract_url};
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use endpoint::{Endpoint, Handler, EndpointPath};
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use parity_reactor::Remote;
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use {SyncStatus};
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#[derive(Clone)]
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pub struct RestApi {
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fetcher: Arc<Fetcher>,
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sync_status: Arc<SyncStatus>,
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time: TimeChecker,
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remote: Remote,
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}
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impl RestApi {
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pub fn new(
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fetcher: Arc<Fetcher>,
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sync_status: Arc<SyncStatus>,
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time: TimeChecker,
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remote: Remote,
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) -> Box<Endpoint> {
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Box::new(RestApi {
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fetcher,
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sync_status,
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time,
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remote,
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})
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}
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}
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impl Endpoint for RestApi {
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fn to_async_handler(&self, path: EndpointPath, control: Control) -> Box<Handler> {
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Box::new(RestApiRouter::new((*self).clone(), path, control))
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}
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}
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struct RestApiRouter {
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api: RestApi,
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path: Option<EndpointPath>,
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control: Option<Control>,
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handler: Box<Handler>,
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}
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impl RestApiRouter {
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fn new(api: RestApi, path: EndpointPath, control: Control) -> Self {
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RestApiRouter {
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path: Some(path),
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control: Some(control),
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api: api,
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handler: Box::new(response::as_json_error(StatusCode::NotFound, &types::ApiError {
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code: "404".into(),
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title: "Not Found".into(),
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detail: "Resource you requested has not been found.".into(),
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})),
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}
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}
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fn resolve_content(&self, hash: Option<&str>, path: EndpointPath, control: Control) -> Option<Box<Handler>> {
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trace!(target: "dapps", "Resolving content: {:?} from path: {:?}", hash, path);
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match hash {
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Some(hash) if self.api.fetcher.contains(hash) => {
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Some(self.api.fetcher.to_async_handler(path, control))
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},
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_ => None
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}
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}
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fn health(&self, control: Control) -> Box<Handler> {
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use self::types::{HealthInfo, HealthStatus, Health};
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trace!(target: "dapps", "Checking node health.");
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// Check timediff
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let sync_status = self.api.sync_status.clone();
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let map = move |time| {
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// Check peers
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let peers = {
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let (connected, max) = sync_status.peers();
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let (status, message) = match connected {
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0 => {
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(HealthStatus::Bad, "You are not connected to any peers. There is most likely some network issue. Fix connectivity.".into())
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},
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1 => (HealthStatus::NeedsAttention, "You are connected to only one peer. Your node might not be reliable. Check your network connection.".into()),
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_ => (HealthStatus::Ok, "".into()),
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};
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HealthInfo { status, message, details: (connected, max) }
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};
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// Check sync
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let sync = {
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let is_syncing = sync_status.is_major_importing();
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let (status, message) = if is_syncing {
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(HealthStatus::NeedsAttention, "Your node is still syncing, the values you see might be outdated. Wait until it's fully synced.".into())
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} else {
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(HealthStatus::Ok, "".into())
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};
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HealthInfo { status, message, details: is_syncing }
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};
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// Check time
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let time = {
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const MAX_DRIFT: i64 = 500;
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let (status, message, details) = match time {
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Ok(Ok(diff)) if diff < MAX_DRIFT && diff > -MAX_DRIFT => {
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(HealthStatus::Ok, "".into(), diff)
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},
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Ok(Ok(diff)) => {
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(HealthStatus::Bad, format!(
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"Your clock is not in sync. Detected difference is too big for the protocol to work: {}ms. Synchronize your clock.",
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diff,
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), diff)
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},
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Ok(Err(err)) => {
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(HealthStatus::NeedsAttention, format!(
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"Unable to reach time API: {}. Make sure that your clock is synchronized.",
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err,
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), 0)
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},
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Err(_) => {
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(HealthStatus::NeedsAttention, "Time API request timed out. Make sure that the clock is synchronized.".into(), 0)
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},
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};
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HealthInfo { status, message, details, }
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};
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let status = if [&peers.status, &sync.status, &time.status].iter().any(|x| *x != &HealthStatus::Ok) {
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StatusCode::PreconditionFailed // HTTP 412
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} else {
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StatusCode::Ok // HTTP 200
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};
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response::as_json(status, &Health { peers, sync, time })
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};
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let time = self.api.time.time_drift();
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let remote = self.api.remote.clone();
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Box::new(handlers::AsyncHandler::new(time, map, remote, control))
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}
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}
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impl server::Handler<net::HttpStream> for RestApiRouter {
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fn on_request(&mut self, request: server::Request<net::HttpStream>) -> Next {
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if let Method::Options = *request.method() {
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self.handler = response::empty();
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return Next::write();
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}
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// TODO [ToDr] Consider using `path.app_params` instead
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let url = extract_url(&request);
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if url.is_none() {
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// Just return 404 if we can't parse URL
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return Next::write();
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}
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let url = url.expect("Check for None early-exists above; qed");
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let mut path = self.path.take().expect("on_request called only once, and path is always defined in new; qed");
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let control = self.control.take().expect("on_request called only once, and control is always defined in new; qed");
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let endpoint = url.path.get(1).map(|v| v.as_str());
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let hash = url.path.get(2).map(|v| v.as_str());
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// at this point path.app_id contains 'api', adjust it to the hash properly, otherwise
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// we will try and retrieve 'api' as the hash when doing the /api/content route
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if let Some(ref hash) = hash { path.app_id = hash.clone().to_owned() }
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let handler = endpoint.and_then(|v| match v {
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"ping" => Some(response::ping()),
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"health" => Some(self.health(control)),
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"content" => self.resolve_content(hash, path, control),
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_ => None
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});
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// Overwrite default
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if let Some(h) = handler {
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self.handler = h;
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}
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self.handler.on_request(request)
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}
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fn on_request_readable(&mut self, decoder: &mut Decoder<net::HttpStream>) -> Next {
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self.handler.on_request_readable(decoder)
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}
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fn on_response(&mut self, res: &mut server::Response) -> Next {
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self.handler.on_response(res)
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}
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fn on_response_writable(&mut self, encoder: &mut Encoder<net::HttpStream>) -> Next {
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self.handler.on_response_writable(encoder)
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}
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}
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