openethereum/dapps/src/api/api.rs

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// 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/>.
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use std::sync::Arc;
use hyper::{Method, StatusCode};
use api::response;
use apps::fetcher::Fetcher;
use endpoint::{Endpoint, Request, Response, EndpointPath};
use futures::{future, Future};
use node_health::{NodeHealth, HealthStatus};
#[derive(Clone)]
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pub struct RestApi {
fetcher: Arc<Fetcher>,
health: NodeHealth,
}
impl Endpoint for RestApi {
fn respond(&self, mut path: EndpointPath, req: Request) -> Response {
if let Method::Options = *req.method() {
return Box::new(future::ok(response::empty()));
}
let endpoint = path.app_params.get(0).map(String::to_owned);
let hash = path.app_params.get(1).map(String::to_owned);
// at this point path.app_id contains 'api', adjust it to the hash properly, otherwise
// we will try and retrieve 'api' as the hash when doing the /api/content route
if let Some(ref hash) = hash {
path.app_id = hash.to_owned();
}
trace!(target: "dapps", "Handling /api request: {:?}/{:?}", endpoint, hash);
match endpoint.as_ref().map(String::as_str) {
Some("ping") => Box::new(future::ok(response::ping(req))),
Some("health") => self.health(),
Some("content") => self.resolve_content(hash.as_ref().map(String::as_str), path, req),
_ => Box::new(future::ok(response::not_found())),
}
}
}
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impl RestApi {
pub fn new(
fetcher: Arc<Fetcher>,
health: NodeHealth,
) -> Box<Endpoint> {
Box::new(RestApi {
fetcher,
health,
})
}
fn resolve_content(&self, hash: Option<&str>, path: EndpointPath, req: Request) -> Response {
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trace!(target: "dapps", "Resolving content: {:?} from path: {:?}", hash, path);
match hash {
Some(hash) if self.fetcher.contains(hash) => {
self.fetcher.respond(path, req)
},
_ => Box::new(future::ok(response::not_found())),
}
}
fn health(&self) -> Response {
Box::new(self.health.health()
.then(|health| {
let status = match health {
Ok(ref health) => {
if [&health.peers.status, &health.sync.status].iter().any(|x| *x != &HealthStatus::Ok) {
StatusCode::PreconditionFailed // HTTP 412
} else {
StatusCode::Ok // HTTP 200
}
},
_ => StatusCode::ServiceUnavailable, // HTTP 503
};
Ok(response::as_json(status, &health).into())
})
)
}
}