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//FIXME: we disallow warnings for the HTTP/2 module temporarily
#![allow(warnings)]
use std::{cell::RefCell, net::SocketAddr, rc::Weak};
use mio::{net::TcpStream, *};
use rusty_ulid::Ulid;
use crate::{
pool::{Checkout, Pool},
socket::{SocketHandler, SocketResult},
sozu_command::buffer::fixed::Buffer,
sozu_command::ready::Ready,
{Protocol, Readiness, SessionMetrics, StateResult},
};
mod parser;
mod serializer;
mod state;
mod stream;
type BackendToken = Token;
#[derive(PartialEq)]
pub enum SessionStatus {
Normal,
DefaultAnswer,
}
pub struct Http2<Front: SocketHandler> {
pub frontend: Connection<Front>,
backend: Option<TcpStream>,
frontend_token: Token,
backend_token: Option<Token>,
back_buf: Option<Checkout>,
pub cluster_id: Option<String>,
pub request_id: Ulid,
pub back_readiness: Readiness,
pub log_ctx: String,
public_address: Option<SocketAddr>,
pub state: Option<state::State>,
pool: Weak<RefCell<Pool>>,
}
impl<Front: SocketHandler> Http2<Front> {
pub fn new(
frontend: Front,
frontend_token: Token,
pool: Weak<RefCell<Pool>>,
public_address: Option<SocketAddr>,
client_address: Option<SocketAddr>,
sticky_name: String,
) -> Http2<Front> {
let request_id = Ulid::generate();
let log_ctx = format!("{}\tunknown\t", &request_id);
let (read, write) = {
let p0 = pool.upgrade().unwrap();
let mut p = p0.borrow_mut();
let res = (p.checkout().unwrap(), p.checkout().unwrap());
res
};
let session = Http2 {
frontend: Connection::new(frontend, read, write),
frontend_token,
backend: None,
backend_token: None,
back_buf: None,
cluster_id: None,
state: Some(state::State::new()),
request_id,
back_readiness: Readiness {
interest: Ready::READABLE | Ready::WRITABLE | Ready::HUP | Ready::ERROR,
event: Ready::EMPTY,
},
log_ctx,
public_address,
pool,
};
trace!("created http2");
session
}
pub fn front_socket(&self) -> &TcpStream {
self.frontend.socket.socket_ref()
}
pub fn front_socket_mut(&mut self) -> &mut TcpStream {
self.frontend.socket.socket_mut()
}
pub fn back_socket(&self) -> Option<&TcpStream> {
self.backend.as_ref()
}
pub fn back_socket_mut(&mut self) -> Option<&mut TcpStream> {
self.backend.as_mut()
}
pub fn set_back_socket(&mut self, socket: TcpStream) {
self.backend = Some(socket);
}
pub fn back_token(&self) -> Option<Token> {
self.backend_token
}
pub fn log_context(&self) -> String {
if let Some(ref cluster_id) = self.cluster_id {
format!("{}\t{}\t", self.request_id, cluster_id)
} else {
format!("{}\tunknown\t", self.request_id)
}
}
pub fn set_back_token(&mut self, token: Token) {
self.backend_token = Some(token);
}
pub fn front_hup(&mut self) -> StateResult {
StateResult::CloseSession
}
pub fn back_hup(&mut self) -> StateResult {
error!("todo[{}:{}]: back_hup", file!(), line!());
StateResult::CloseSession
/*
if self.back_buf.output_data_size() == 0 || self.back_buf.next_output_data().len() == 0 {
if self.back_readiness.event.is_readable() {
self.back_readiness().interest.insert(Ready::READABLE);
error!("Http2::back_hup: backend connection closed but the kernel still holds some data. readiness: {:?} -> {:?}", self.frontend.readiness, self.back_readiness);
SessionResult::Continue
} else {
SessionResult::CloseSession
}
} else {
self.frontend.readiness().interest.insert(Ready::WRITABLE);
if self.back_readiness.event.is_readable() {
self.back_readiness.interest.insert(Ready::READABLE);
}
SessionResult::Continue
}
*/
}
// Read content from the session
pub fn readable(&mut self, metrics: &mut SessionMetrics) -> StateResult {
trace!("http2 readable");
error!("todo[{}:{}]: readable", file!(), line!());
/* do not handle buffer pooling for now
if self.front_buf.is_none() {
if let Some(p) = self.pool.upgrade() {
if let Some(buf) = p.borrow_mut().checkout() {
self.front_buf = Some(buf);
} else {
error!("cannot get front buffer from pool, closing");
return SessionResult::CloseSession;
}
}
}
*/
if self.frontend.read_buffer.available_space() == 0 {
if self.backend_token == None {
//let answer_413 = "HTTP/1.1 413 Payload Too Large\r\nContent-Length: 0\r\n\r\n";
//self.set_answer(DefaultAnswerStatus::Answer413, Rc::new(Vec::from(answer_413.as_bytes())));
self.frontend.readiness.interest.remove(Ready::READABLE);
self.frontend.readiness.interest.insert(Ready::WRITABLE);
} else {
self.frontend.readiness.interest.remove(Ready::READABLE);
self.back_readiness.interest.insert(Ready::WRITABLE);
}
return StateResult::Continue;
}
let res = self.frontend.read(metrics);
match res {
SocketResult::Error => {
let front_readiness = self.frontend.readiness.clone();
let back_readiness = self.back_readiness.clone();
error!(
"front socket error, closing the connection. Readiness: {:?} -> {:?}",
front_readiness, back_readiness
);
return StateResult::CloseSession;
}
SocketResult::Closed => {
return StateResult::CloseSession;
}
SocketResult::WouldBlock => {}
SocketResult::Continue => {}
};
self.readable_parse(metrics)
}
pub fn readable_parse(&mut self, metrics: &mut SessionMetrics) -> StateResult {
let mut state = self.state.take().unwrap();
let (sz, cont) = { state.parse_and_handle(self.frontend.read_buffer.data()) };
self.frontend.read_buffer.consume(sz);
self.frontend.readiness.interest = state.interest;
self.state = Some(state);
match cont {
state::FrameResult::Close => StateResult::CloseSession,
state::FrameResult::Continue => StateResult::Continue,
state::FrameResult::ConnectBackend(id) => StateResult::ConnectBackend,
}
/*let is_initial = unwrap_msg!(self.state.as_ref()).request == Some(RequestState::Initial);
// if there's no host, continue parsing until we find it
let has_host = unwrap_msg!(self.state.as_ref()).has_host();
if !has_host {
self.state = Some(parse_request_until_stop(unwrap_msg!(self.state.take()), &self.request_id,
&mut self.front_buf.as_mut().unwrap(), &self.sticky_name));
if unwrap_msg!(self.state.as_ref()).is_front_error() {
self.log_request_error(metrics, "front parsing error, closing the connection");
incr!("http.front_parse_errors");
// increment active requests here because it will be decremented right away
// when closing the connection. It's slightly easier than decrementing it
// at every place we return SessionResult::CloseSession
gauge_add!("http.active_requests", 1);
return SessionResult::CloseSession;
}
}
*/
}
// Forward content to session
pub fn writable(&mut self, metrics: &mut SessionMetrics) -> StateResult {
trace!("http2 writable");
error!("todo[{}:{}]: writable", file!(), line!());
let mut state = self.state.take().unwrap();
//FIXME: do that in a loop until no more frames or WouldBlock
match state.gen(self.frontend.write_buffer.space()) {
Ok(sz) => {
self.frontend.write_buffer.fill(sz);
//FIXME: use real condition here to indicate there was nothing to write
if sz == 0 {}
}
Err(e) => {
self.state = Some(state);
error!("error serializing to front write buffer: {:?}", e);
return StateResult::CloseSession;
}
}
self.frontend.readiness.interest = state.interest;
let res = self.frontend.write(metrics);
match res {
SocketResult::Error | SocketResult::Closed => {
error!(
"{}\t[{:?}] error writing to front socket, closing",
self.log_ctx, self.frontend_token
);
incr!("http2.errors");
metrics.service_stop();
self.frontend.readiness.reset();
self.back_readiness.reset();
self.state = Some(state);
return StateResult::CloseSession;
}
SocketResult::WouldBlock => {}
SocketResult::Continue => {}
}
self.state = Some(state);
StateResult::Continue
}
// Forward content to cluster
pub fn back_writable(&mut self, metrics: &mut SessionMetrics) -> StateResult {
trace!("http2 back_writable");
error!("todo[{}:{}]: back_writable", file!(), line!());
StateResult::CloseSession
/*
if self.front_buf.output_data_size() == 0 || self.front_buf.next_output_data().len() == 0 {
self.frontend.readiness.interest.insert(Ready::READABLE);
self.back_readiness.interest.remove(Ready::WRITABLE);
return SessionResult::Continue;
}
let tokens = self.tokens().clone();
let output_size = self.front_buf.output_data_size();
let mut sz = 0usize;
let mut socket_res = SocketResult::Continue;
if let Some(ref mut backend) = self.backend {
while socket_res == SocketResult::Continue && self.front_buf.output_data_size() > 0 {
// no more data in buffer, stop here
if self.front_buf.next_output_data().len() == 0 {
self.frontend.readiness.interest.insert(Ready::READABLE);
self.back_readiness.interest.remove(Ready::WRITABLE);
return SessionResult::Continue;
}
let (current_sz, current_res) = backend.socket_write(self.front_buf.next_output_data());
socket_res = current_res;
self.front_buf.consume_output_data(current_sz);
self.front_buf_position += current_sz;
sz += current_sz;
}
}
metrics.backend_bout += sz;
if let Some((front,back)) = tokens {
debug!("{}\tBACK [{}->{}]: wrote {} bytes of {}", self.log_ctx, front.0, back.0, sz, output_size);
}
match socket_res {
SocketResult::Error | SocketResult::Closed => {
error!("{}\tback socket write error, closing connection", self.log_ctx);
metrics.service_stop();
incr!("http2.errors");
self.frontend.readiness.reset();
self.back_readiness.reset();
return SessionResult::CloseSession;
},
SocketResult::WouldBlock => {
self.back_readiness.event.remove(Ready::WRITABLE);
},
SocketResult::Continue => {}
}
SessionResult::Continue
*/
}
// Read content from cluster
pub fn back_readable(&mut self, metrics: &mut SessionMetrics) -> StateResult {
trace!("http2 back_readable");
error!("todo[{}:{}]: back_readable", file!(), line!());
StateResult::CloseSession
/*
if self.back_buf.buffer.available_space() == 0 {
self.back_readiness.interest.remove(Ready::READABLE);
return SessionResult::Continue;
}
let tokens = self.tokens().clone();
if let Some(ref mut backend) = self.backend {
let (sz, r) = backend.socket_read(&mut self.back_buf.buffer.space());
self.back_buf.buffer.fill(sz);
self.back_buf.sliced_input(sz);
self.back_buf.consume_parsed_data(sz);
self.back_buf.slice_output(sz);
if let Some((front,back)) = tokens {
debug!("{}\tBACK [{}<-{}]: read {} bytes", self.log_ctx, front.0, back.0, sz);
}
if r != SocketResult::Continue || sz == 0 {
self.back_readiness.event.remove(Ready::READABLE);
}
if sz > 0 {
self.frontend.readiness.interest.insert(Ready::WRITABLE);
metrics.backend_bin += sz;
}
match r {
SocketResult::Error => {
error!("{}\tback socket read error, closing connection", self.log_ctx);
metrics.service_stop();
incr!("http2.errors");
self.frontend.readiness.reset();
self.back_readiness.reset();
return SessionResult::CloseSession;
},
SocketResult::Closed => {
metrics.service_stop();
self.frontend.readiness.reset();
self.back_readiness.reset();
return SessionResult::CloseSession;
},
SocketResult::WouldBlock => {
self.back_readiness.event.remove(Ready::READABLE);
},
SocketResult::Continue => {}
}
}
SessionResult::Continue
*/
}
}
pub struct Connection<Socket: SocketHandler> {
pub socket: Socket,
pub readiness: Readiness,
pub read_buffer: Checkout,
pub write_buffer: Checkout,
}
impl<Socket: SocketHandler> Connection<Socket> {
pub fn new(socket: Socket, read_buffer: Checkout, write_buffer: Checkout) -> Self {
Connection {
socket,
readiness: Readiness {
interest: Ready::READABLE | Ready::WRITABLE | Ready::HUP | Ready::ERROR,
event: Ready::EMPTY,
},
//FIXME: capacity can be configured
read_buffer,
//FIXME: capacity can be configured
write_buffer,
}
}
pub fn read(&mut self, metrics: &mut SessionMetrics) -> SocketResult {
let (sz, res) = self.socket.socket_read(self.read_buffer.space());
if sz > 0 {
count!("bytes_in", sz as i64);
metrics.bin += sz;
self.read_buffer.fill(sz);
if self.read_buffer.available_space() == 0 {
self.readiness.interest.remove(Ready::READABLE);
}
} else {
self.readiness.event.remove(Ready::READABLE);
}
if res == SocketResult::WouldBlock {
self.readiness.event.remove(Ready::READABLE);
}
res
}
pub fn write(&mut self, metrics: &mut SessionMetrics) -> SocketResult {
let mut sz = 0usize;
let mut res = SocketResult::Continue;
while res == SocketResult::Continue && self.write_buffer.available_data() > 0 {
let (current_sz, current_res) = self.socket.socket_write(self.write_buffer.data());
res = current_res;
self.write_buffer.consume(current_sz);
sz += current_sz;
}
if sz > 0 {
count!("bytes_out", sz as i64);
metrics.bout += sz;
}
if res == SocketResult::WouldBlock {
self.readiness.event.remove(Ready::WRITABLE);
}
res
}
}