openethereum/dapps/src/handlers/echo.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/>.
//! Echo Handler
use std::io::Read;
use hyper::{server, Decoder, Encoder, Next};
use hyper::net::HttpStream;
use super::ContentHandler;
#[derive(Default)]
pub struct EchoHandler {
content: String,
handler: Option<ContentHandler>,
}
impl server::Handler<HttpStream> for EchoHandler {
fn on_request(&mut self, _: server::Request<HttpStream>) -> Next {
Next::read()
}
fn on_request_readable(&mut self, decoder: &mut Decoder<HttpStream>) -> Next {
match decoder.read_to_string(&mut self.content) {
Ok(0) => {
self.handler = Some(ContentHandler::ok(self.content.clone(), mime!(Application/Json)));
Next::write()
},
Ok(_) => Next::read(),
Err(e) => match e.kind() {
::std::io::ErrorKind::WouldBlock => Next::read(),
_ => Next::end(),
}
}
}
fn on_response(&mut self, res: &mut server::Response) -> Next {
self.handler.as_mut()
.expect("handler always set in on_request, which is before now; qed")
.on_response(res)
}
fn on_response_writable(&mut self, encoder: &mut Encoder<HttpStream>) -> Next {
self.handler.as_mut()
.expect("handler always set in on_request, which is before now; qed")
.on_response_writable(encoder)
}
}