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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)
    	}
    }

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