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zhtta.rs
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zhtta.rs
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//
// zhtta.rs
//
// Starting code for PS3
// Running on Rust 0.9
//
// Note that this code has serious security risks! You should not run it
// on any system with access to sensitive files.
//
// University of Virginia - cs4414 Spring 2014
// Weilin Xu and David Evans
// Version 0.5
// To see debug! outputs set the RUST_LOG environment variable, e.g.: export RUST_LOG="zhtta=debug"
#[feature(globs)];
extern mod extra;
use std::io::*;
use std::io::net::ip::{SocketAddr};
use std::{os, str, libc, from_str};
use std::path::Path;
use std::hashmap::HashMap;
use extra::getopts;
use extra::arc::MutexArc;
static SERVER_NAME : &'static str = "Zhtta Version 0.5";
static IP : &'static str = "127.0.0.1";
static PORT : uint = 4414;
static WWW_DIR : &'static str = "./www";
static HTTP_OK : &'static str = "HTTP/1.1 200 OK\r\nContent-Type: text/html; charset=UTF-8\r\n\r\n";
static HTTP_BAD : &'static str = "HTTP/1.1 404 Not Found\r\n\r\n";
static COUNTER_STYLE : &'static str = "<doctype !html><html><head><title>Hello, Rust!</title>
<style>body { background-color: #884414; color: #FFEEAA}
h1 { font-size:2cm; text-align: center; color: black; text-shadow: 0 0 4mm red }
h2 { font-size:2cm; text-align: center; color: black; text-shadow: 0 0 4mm green }
</style></head>
<body>";
static mut visitor_count : uint = 0;
struct HTTP_Request {
// Use peer_name as the key to access TcpStream in hashmap.
// (Due to a bug in extra::arc in Rust 0.9, it is very inconvenient to use TcpStream without the "Freeze" bound.
// See issue: https://github.com/mozilla/rust/issues/12139)
peer_name: ~str,
path: ~Path,
}
struct WebServer {
ip: ~str,
port: uint,
www_dir_path: ~Path,
request_queue_arc: MutexArc<~[HTTP_Request]>,
stream_map_arc: MutexArc<HashMap<~str, Option<std::io::net::tcp::TcpStream>>>,
notify_port: Port<()>,
shared_notify_chan: SharedChan<()>,
}
impl WebServer {
fn new(ip: &str, port: uint, www_dir: &str) -> WebServer {
let (notify_port, shared_notify_chan) = SharedChan::new();
let www_dir_path = ~Path::new(www_dir);
os::change_dir(www_dir_path.clone());
WebServer {
ip: ip.to_owned(),
port: port,
www_dir_path: www_dir_path,
request_queue_arc: MutexArc::new(~[]),
stream_map_arc: MutexArc::new(HashMap::new()),
notify_port: notify_port,
shared_notify_chan: shared_notify_chan,
}
}
fn run(&mut self) {
self.listen();
self.dequeue_static_file_request();
}
fn listen(&mut self) {
let addr = from_str::<SocketAddr>(format!("{:s}:{:u}", self.ip, self.port)).expect("Address error.");
let www_dir_path_str = self.www_dir_path.as_str().expect("invalid www path?").to_owned();
let request_queue_arc = self.request_queue_arc.clone();
let shared_notify_chan = self.shared_notify_chan.clone();
let stream_map_arc = self.stream_map_arc.clone();
spawn(proc() {
let mut acceptor = net::tcp::TcpListener::bind(addr).listen();
println!("{:s} listening on {:s} (serving from: {:s}).",
SERVER_NAME, addr.to_str(), www_dir_path_str);
for stream in acceptor.incoming() {
let (queue_port, queue_chan) = Chan::new();
queue_chan.send(request_queue_arc.clone());
let notify_chan = shared_notify_chan.clone();
let stream_map_arc = stream_map_arc.clone();
// Spawn a task to handle the connection.
spawn(proc() {
unsafe { visitor_count += 1; } // TODO: Fix unsafe counter
let request_queue_arc = queue_port.recv();
let mut stream = stream;
let peer_name = WebServer::get_peer_name(&mut stream);
let mut buf = [0, ..500];
stream.read(buf);
let request_str = str::from_utf8(buf);
debug!("Request:\n{:s}", request_str);
let req_group : ~[&str]= request_str.splitn(' ', 3).collect();
if req_group.len() > 2 {
let path_str = "." + req_group[1].to_owned();
let mut path_obj = ~os::getcwd();
path_obj.push(path_str.clone());
let ext_str = match path_obj.extension_str() {
Some(e) => e,
None => "",
};
debug!("Requested path: [{:s}]", path_obj.as_str().expect("error"));
debug!("Requested path: [{:s}]", path_str);
if path_str == ~"./" {
debug!("===== Counter Page request =====");
WebServer::respond_with_counter_page(stream);
debug!("=====Terminated connection from [{:s}].=====", peer_name);
} else if !path_obj.exists() || path_obj.is_dir() {
debug!("===== Error page request =====");
WebServer::respond_with_error_page(stream, path_obj);
debug!("=====Terminated connection from [{:s}].=====", peer_name);
} else if ext_str == "shtml" { // Dynamic web pages.
debug!("===== Dynamic Page request =====");
WebServer::respond_with_dynamic_page(stream, path_obj);
debug!("=====Terminated connection from [{:s}].=====", peer_name);
} else {
debug!("===== Static Page request =====");
WebServer::enqueue_static_file_request(stream, path_obj, stream_map_arc, request_queue_arc, notify_chan);
}
}
});
}
});
}
fn respond_with_error_page(stream: Option<std::io::net::tcp::TcpStream>, path: &Path) {
let mut stream = stream;
let msg: ~str = format!("Cannot open: {:s}", path.as_str().expect("invalid path").to_owned());
stream.write(HTTP_BAD.as_bytes());
stream.write(msg.as_bytes());
}
// TODO: Safe visitor counter.
fn respond_with_counter_page(stream: Option<std::io::net::tcp::TcpStream>) {
let mut stream = stream;
let response: ~str =
format!("{:s}{:s}<h1>Greetings, Krusty!</h1>
<h2>Visitor count: {:u}</h2></body></html>\r\n",
HTTP_OK, COUNTER_STYLE,
unsafe { visitor_count } );
debug!("Responding to counter request");
stream.write(response.as_bytes());
}
// TODO: Streaming file.
// TODO: Application-layer file caching.
fn respond_with_static_file(stream: Option<std::io::net::tcp::TcpStream>, path: &Path) {
let mut stream = stream;
let mut file_reader = File::open(path).expect("Invalid file!");
stream.write(HTTP_OK.as_bytes());
stream.write(file_reader.read_to_end());
}
// TODO: Server-side gashing.
fn respond_with_dynamic_page(stream: Option<std::io::net::tcp::TcpStream>, path: &Path) {
// for now, just serve as static file
WebServer::respond_with_static_file(stream, path);
}
// TODO: Smarter Scheduling.
fn enqueue_static_file_request(stream: Option<std::io::net::tcp::TcpStream>, path_obj: &Path, stream_map_arc: MutexArc<HashMap<~str, Option<std::io::net::tcp::TcpStream>>>, req_queue_arc: MutexArc<~[HTTP_Request]>, notify_chan: SharedChan<()>) {
// Save stream in hashmap for later response.
let mut stream = stream;
let peer_name = WebServer::get_peer_name(&mut stream);
let (stream_port, stream_chan) = Chan::new();
stream_chan.send(stream);
unsafe {
// Use an unsafe method, because TcpStream in Rust 0.9 doesn't have "Freeze" bound.
stream_map_arc.unsafe_access(|local_stream_map| {
let stream = stream_port.recv();
local_stream_map.swap(peer_name.clone(), stream);
});
}
// Enqueue the HTTP request.
let req = HTTP_Request { peer_name: peer_name.clone(), path: ~path_obj.clone() };
let (req_port, req_chan) = Chan::new();
req_chan.send(req);
debug!("Waiting for queue mutex lock.");
req_queue_arc.access(|local_req_queue| {
debug!("Got queue mutex lock.");
let req: HTTP_Request = req_port.recv();
local_req_queue.push(req);
debug!("A new request enqueued, now the length of queue is {:u}.", local_req_queue.len());
});
notify_chan.send(()); // Send incoming notification to responder task.
}
// TODO: Smarter Scheduling.
fn dequeue_static_file_request(&mut self) {
let req_queue_get = self.request_queue_arc.clone();
let stream_map_get = self.stream_map_arc.clone();
// Port<> cannot be sent to another task. So we have to make this task as the main task that can access self.notify_port.
let (request_port, request_chan) = Chan::new();
loop {
self.notify_port.recv(); // waiting for new request enqueued.
req_queue_get.access( |req_queue| {
match req_queue.shift_opt() { // FIFO queue.
None => { /* do nothing */ }
Some(req) => {
request_chan.send(req);
debug!("A new request dequeued, now the length of queue is {:u}.", req_queue.len());
}
}
});
let request = request_port.recv();
// Get stream from hashmap.
// Use unsafe method, because TcpStream in Rust 0.9 doesn't have "Freeze" bound.
let (stream_port, stream_chan) = Chan::new();
unsafe {
stream_map_get.unsafe_access(|local_stream_map| {
let stream = local_stream_map.pop(&request.peer_name).expect("no option tcpstream");
stream_chan.send(stream);
});
}
// TODO: Spawning more tasks to respond the dequeued requests concurrently. You may need a semophore to control the concurrency.
let stream = stream_port.recv();
WebServer::respond_with_static_file(stream, request.path);
// Close stream automatically.
debug!("=====Terminated connection from [{:s}].=====", request.peer_name);
}
}
fn get_peer_name(stream: &mut Option<std::io::net::tcp::TcpStream>) -> ~str {
match *stream {
Some(ref mut s) => {
match s.peer_name() {
Some(pn) => {pn.to_str()},
None => (~"")
}
},
None => (~"")
}
}
}
fn get_args() -> (~str, uint, ~str) {
fn print_usage(program: &str) {
println!("Usage: {:s} [options]", program);
println!("--ip \tIP address, \"{:s}\" by default.", IP);
println!("--port \tport number, \"{:u}\" by default.", PORT);
println!("--www \tworking directory, \"{:s}\" by default", WWW_DIR);
println("-h --help \tUsage");
}
/* Begin processing program arguments and initiate the parameters. */
let args = os::args();
let program = args[0].clone();
let opts = ~[
getopts::optopt("ip"),
getopts::optopt("port"),
getopts::optopt("www"),
getopts::optflag("h"),
getopts::optflag("help")
];
let matches = match getopts::getopts(args.tail(), opts) {
Ok(m) => { m }
Err(f) => { fail!(f.to_err_msg()) }
};
if matches.opt_present("h") || matches.opt_present("help") {
print_usage(program);
unsafe { libc::exit(1); }
}
let ip_str = if matches.opt_present("ip") {
matches.opt_str("ip").expect("invalid ip address?").to_owned()
} else {
IP.to_owned()
};
let port:uint = if matches.opt_present("port") {
from_str::from_str(matches.opt_str("port").expect("invalid port number?")).expect("not uint?")
} else {
PORT
};
let www_dir_str = if matches.opt_present("www") {
matches.opt_str("www").expect("invalid www argument?")
} else { WWW_DIR.to_owned() };
(ip_str, port, www_dir_str)
}
fn main() {
let (ip_str, port, www_dir_str) = get_args();
let mut zhtta = WebServer::new(ip_str, port, www_dir_str);
zhtta.run();
}