rain_server 0.4.0

Distributed computational framework for large-scale task-based pipelines. Server and governor binaries.
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use futures;
use futures::Future;
use futures::Stream;
use hyper::header::{AccessControlAllowOrigin, ContentEncoding, ContentLength, Encoding};
use hyper::server::{Request, Response, Service};
use hyper::{Error, StatusCode};
use rain_core::errors;

use server::state::StateRef;

pub struct RequestHandler {
    state: ::server::state::StateRef,
}

fn wrap_elements<I>(open_tag: &str, close_tag: &str, elements: I) -> String
where
    I: IntoIterator<Item = String>,
{
    let mut result = String::new();
    for e in elements.into_iter() {
        result.push_str(open_tag);
        result.push_str(&e);
        result.push_str(close_tag);
    }
    result
}

impl RequestHandler {
    pub fn new(state: ::server::state::StateRef) -> Self {
        Self { state: state }
    }
}

type ResponseFuture = Box<futures::Future<Item = Response, Error = errors::Error>>;

fn get_events(state: &StateRef, body: &str) -> ResponseFuture {
    let state = state.clone();
    match ::serde_json::from_str(body) {
        Ok(search_criteria) => Box::new(state.get().logger.get_events(search_criteria).map(
            |events| {
                let chunks: Vec<_> = events
                    .iter()
                    .map(|&(id, time, ref event)| {
                        format!(
                            "{{\"id\":{}, \"time\":\"{}\", \"event\":{}}}",
                            id, time, event
                        )
                    })
                    .collect();
                let result = format!("[{}]", chunks.join(","));
                make_text_response(result)
            },
        )),
        Err(e) => Box::new(::futures::future::failed(e.into())),
    }
}

fn lite_dashboard(state: &StateRef) -> ResponseFuture {
    Box::new(::futures::future::ok(make_text_response(format!(
        "<html>
    <style>
        table, th, td {{
            border: 1px solid black;
            border-collapse: collapse;
        }}
    </style>
    <body>
    <h1>Rain / Dashboard Lite</h1>
    <p>{time}</p>
    <h2>Governors</h2>
    <table>
    <thead><tr><th>ID<th>cpus</tr>
    </thead>
    {governor_tab}
    </table>
    </body>
    </html>",
        time = ::chrono::Utc::now(),
        governor_tab =
            wrap_elements(
                "<tr>",
                "</tr>",
                state.get().graph.governors.iter().map(|(id, ref wref)| {
                    format!("<td>{}</td><td>{}</td>", id, wref.get().resources.cpus)
                }),
            )
    ))))
}

fn make_text_response(data: String) -> Response {
    Response::new()
        .with_header(ContentLength(data.len() as u64))
        .with_header(AccessControlAllowOrigin::Any)
        .with_body(data)
    /*        Err(e) => {
            warn!("Http request error: {}", e.description());
            Response::new()
                .with_status(StatusCode::InternalServerError)
                .with_header(AccessControlAllowOrigin::Any)
        }
    }*/
}

fn static_data_response(data: &'static [u8]) -> ResponseFuture {
    Box::new(::futures::future::ok(
        Response::new()
            .with_header(ContentLength(data.len() as u64))
            .with_body(data),
    ))
}

fn static_gzipped_response(data: &'static [u8]) -> ResponseFuture {
    Box::new(::futures::future::ok(
        Response::new()
            .with_header(ContentEncoding(vec![Encoding::Gzip]))
            .with_header(ContentLength(data.len() as u64))
            .with_body(data),
    ))
}

impl Service for RequestHandler {
    type Request = Request;
    type Response = Response;
    type Error = Error;

    type Future = Box<futures::Future<Item = Self::Response, Error = Self::Error>>;

    fn call(&self, req: Request) -> Self::Future {
        let state_ref = self.state.clone();
        debug!("HTTP request: {}", req.path());
        let path = req.path().to_string();
        Box::new(req.body().concat2().and_then(move |body| {
            let body = ::std::str::from_utf8(&body).unwrap();
            let future = match path.as_str() {
                "/events" => get_events(&state_ref, &body),
                "/lite" | "/lite/" => lite_dashboard(&state_ref),
                // to protect against caching, .js contain hash in index.html, the same for .css file
                path if path.starts_with("/static/js/main.") && path.ends_with(".js") => {
                    static_gzipped_response(
                        &include_bytes!("./../../dashboard/dist/main.js.gz")[..],
                    )
                }
                path if path.starts_with("/static/css/main.") && path.ends_with(".css") => {
                    static_gzipped_response(
                        &include_bytes!("./../../dashboard/dist/main.css.gz")[..],
                    )
                }
                _ => static_data_response(
                    &include_bytes!("./../../dashboard/dist/index.html")[..],
                ),
                /*path =>  {
                        warn!("Invalid HTTP request: {}", path);
                        Response::new().with_status(StatusCode::NotFound)
                    }*/
            };
            future.then(|r| {
                Ok(match r {
                    Ok(response) => response,
                    Err(_) => Response::new()
                        .with_status(StatusCode::InternalServerError)
                        .with_header(AccessControlAllowOrigin::Any),
                })
            })
        }))
    }
}