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use std::thread;
use std::sync::Arc;
use std::collections::HashMap;
use std::net::ToSocketAddrs;
use websocket::Server;
use slab::Slab;
use service::Service;
use session::{self, Alternative, Context, Output, Builder, Session};
use worker::{Realize, Shortcut};
pub struct Suite<T: Session, B: Builder<T>> {
builder: B,
services: HashMap<String, Box<Service<T>>>,
}
impl<T: Session, B: Builder<T>> Suite<T, B> {
pub fn new(builder: B) -> Self {
Suite {
builder: builder,
services: HashMap::new(),
}
}
pub fn register<S: Service<T>>(&mut self, name: &str, service: S) {
self.services.insert(name.to_owned(), Box::new(service));
}
}
pub fn start<T, A, B>(addr: A, suite: Suite<T, B>)
where A: ToSocketAddrs, B: Builder<T>, T: Session {
let server = Server::bind(addr).unwrap();
let suite = Arc::new(suite);
for connection in server {
let suite = suite.clone();
thread::spawn(move || {
let request = connection.unwrap().read_request().unwrap();
request.validate().unwrap();
let response = request.accept();
let mut client = response.send().unwrap();
let ip = client.get_mut_sender().get_mut().peer_addr().unwrap();
debug!("Connection from {}", ip);
let mut session: Context<T> = Context::new(client, suite.builder.build());
debug!("Start session for {}", ip);
let mut suspended_workers = Slab::with_capacity(10);
loop {
debug!("Begin new request processing for {}", ip);
let result: Result<(), session::Error> = (|session: &mut Context<T>| {
loop {
let mut worker = match try!(session.recv_request_or_resume()) {
Alternative::Usual((service_name, request)) => {
let service = match suite.services.get(&service_name) {
Some(value) => value,
None => return Err(session::Error::ServiceNotFound),
};
let mut worker = service.route(&request);
match try!(worker.prepare(session, request)) {
Shortcut::Done => {
try!(session.send(Output::Done));
continue;
},
Shortcut::Reject(reason) => {
try!(session.send(Output::Reject(reason)));
continue;
},
Shortcut::Tuned => (),
}
worker
},
Alternative::Unusual(task_id) => {
match suspended_workers.remove(task_id) {
Some(worker) => {
worker
},
None => {
return Err(session::Error::WorkerNotFound);
},
}
},
};
loop {
try!(session.send(Output::Ready));
match try!(session.recv_next_or_suspend()) {
Alternative::Usual(option_request) => {
match try!(worker.realize(session, option_request)) {
Realize::OneItem(item) => {
try!(session.send(Output::Item(item)));
},
Realize::OneItemAndDone(item) => {
try!(session.send(Output::Item(item)));
try!(session.send(Output::Done));
break;
},
Realize::ManyItems(iter) => {
for item in iter {
try!(session.send(Output::Item(item)));
}
},
Realize::ManyItemsAndDone(iter) => {
for item in iter {
try!(session.send(Output::Item(item)));
}
try!(session.send(Output::Done));
break;
},
Realize::Reject(reason) => {
try!(session.send(Output::Reject(reason)));
break;
},
Realize::Done => {
try!(session.send(Output::Done));
break;
},
}
},
Alternative::Unusual(()) => {
match suspended_workers.insert(worker) {
Ok(task_id) => {
try!(session.send(Output::Suspended(task_id)));
break;
},
Err(_) => {
return Err(session::Error::CannotSuspend);
},
}
},
}
}
}
})(&mut session);
if let Err(reason) = result {
let output = match reason {
session::Error::Canceled => continue,
session::Error::ConnectionBroken => break,
session::Error::ConnectionClosed => break,
_ => {
warn!("Request processing {} have catch an error {:?}", ip, reason);
Output::Fail(reason.to_string())
},
};
session.send(output).unwrap();
}
}
debug!("Ends session for {}", ip);
});
}
}