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#![warn(missing_docs, unused_import_braces, unused_extern_crates)]
pub mod cfg;
mod def;
mod hdr;
mod util;
use async_std::{
net::{SocketAddr, UdpSocket},
sync::Arc,
task,
};
use def::Proxy;
use flate2::write::ZlibDecoder;
use lazy_static::lazy_static;
use myutil::{err::*, *};
use parking_lot::Mutex;
use std::{io::Write, sync::mpsc::channel};
use ttserver_def::*;
lazy_static! {
static ref CFG: &'static cfg::Cfg = pnk!(cfg::register_cfg(None));
static ref SOCK: UdpSocket = pnk!(gen_master_sock());
static ref SOCK_MID: UdpSocket = pnk!(gen_middle_sock());
static ref PROXY: Arc<Mutex<Proxy>> =
Arc::new(Mutex::new(Proxy::default()));
}
pub fn start(cfg: cfg::Cfg) -> Result<()> {
pnk!(cfg::register_cfg(Some(cfg)));
start_middle_serv();
task::spawn(start_serv());
hdr::sync::start_cron();
Ok(())
}
fn start_middle_serv() {
fn deal_slave_resp(
peeraddr: SocketAddr,
slave_resp: Vec<u8>,
) -> Result<()> {
let mut d = ZlibDecoder::new(vct![]);
d.write_all(&slave_resp[..])
.c(d!())
.and_then(|_| d.finish().c(d!()))
.and_then(|resp_decompressed| {
serde_json::from_slice::<Resp>(&resp_decompressed).c(d!())
})
.and_then(|resp| {
let uuid = resp.uuid;
let mut proxy = PROXY.lock();
let idx = *proxy.idx_map.get(&resp.uuid).ok_or(eg!())?;
let slave_res =
proxy.buckets[idx].res.get_mut(&resp.uuid).ok_or(eg!())?;
slave_res.num_to_wait -= 1;
slave_res.msg.insert(peeraddr, resp);
if 0 == slave_res.num_to_wait {
proxy.buckets[idx].res.remove(&uuid);
}
Ok(())
})
}
task::spawn(async {
let mut buf = vec![0; 64 * 1024];
loop {
if let Ok((size, peeraddr)) =
info!(SOCK_MID.recv_from(&mut buf).await)
{
let recvd = buf[..size].to_vec();
task::spawn(async move {
info_omit!(deal_slave_resp(peeraddr, recvd));
});
}
}
});
task::spawn(async {
loop {
util::asleep(1).await;
PROXY.lock().clean_timeout();
}
});
}
#[inline(always)]
async fn start_serv() -> Result<()> {
let mut buf = vec![0; 8192];
loop {
if let Ok((size, peeraddr)) = info!(SOCK.recv_from(&mut buf).await) {
if size < OPS_ID_LEN {
p(eg!(format!("Invalid request from {}", peeraddr)));
continue;
}
parse_ops_id(&buf[0..OPS_ID_LEN])
.c(d!())
.map(|ops_id| {
let recvd = buf[OPS_ID_LEN..size].to_vec();
task::spawn(async move {
info_omit!(serv_it(ops_id, recvd, peeraddr));
});
})
.unwrap_or_else(|e| p(e));
}
}
}
#[inline(always)]
fn serv_it(
ops_id: usize,
request: Vec<u8>,
peeraddr: SocketAddr,
) -> Result<()> {
if let Some(ops) = hdr::OPS_MAP.get(ops_id) {
ops(ops_id, peeraddr, request)
.c(d!())
.or_else(|e| send_err!(DEFAULT_REQ_ID, e, peeraddr))
} else {
send_err!(DEFAULT_REQ_ID, eg!("Invalid operation-id !"), peeraddr)
}
}
#[inline(always)]
fn parse_ops_id(raw: &[u8]) -> Result<usize> {
String::from_utf8_lossy(raw).parse::<usize>().c(d!())
}
fn gen_master_sock() -> Result<UdpSocket> {
let (s, r) = channel();
task::spawn(async move {
let sock = UdpSocket::bind(&CFG.proxy_serv_at).await;
info_omit!(s.send(sock));
});
if let Ok(Ok(sock)) = r.recv() {
return Ok(sock);
}
Err(eg!())
}
fn gen_middle_sock() -> Result<UdpSocket> {
let (s, r) = channel();
let mut addr;
for port in (20_000 + ts!() % 10_000)..60_000 {
addr = SocketAddr::from(([0, 0, 0, 0], port as u16));
let ss = s.clone();
task::spawn(async move {
let sock = UdpSocket::bind(addr).await;
info_omit!(ss.send(sock));
});
if let Ok(Ok(sock)) = r.recv() {
return Ok(sock);
}
}
Err(eg!())
}