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con_pool.rs
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con_pool.rs
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/*! FCGI Application serving for [Hyper 0.13](https://github.com/hyperium/hyper).
This Module consists of the following Objects:
* [`ConPool`]: supports FCGI_MAX_CONNS Connections
* [`Connection`]: handles up to FCGI_MAX_REQS concurrent Requests
[`ConPool`]: ./struct.ConPool.html
[`Connection`]: ../connection/index.html
*/
use crate::client::connection::{Connection, MultiHeaderStrategy, HeaderMultilineStrategy};
use crate::codec::FCGIWriter;
use crate::fastcgi::{Body, Record, MAX_CONNS, MAX_REQS, MPXS_CONNS, RecordType};
use async_stream_connection::{Addr, Stream};
use bytes::{Buf, BufMut, Bytes, BytesMut};
use http::{Request, Response};
use http_body::Body as HttpBody;
use log::{info, trace};
use std::error::Error;
use std::fmt;
use std::io::Error as IoError;
use std::iter::IntoIterator;
use tokio::io::AsyncReadExt;
#[cfg(all(unix, feature = "app_start"))]
use async_stream_connection::Listener;
#[cfg(feature = "app_start")]
use std::ffi::OsStr;
#[cfg(all(unix, feature = "app_start"))]
use std::os::unix::io::{AsRawFd, FromRawFd};
#[cfg(feature = "app_start")]
use std::process::Stdio;
#[cfg(feature = "app_start")]
use tokio::process::Command;
/// manage a pool of [`Connection`]s to an Server.
pub struct ConPool {
/*
sock_addr: String,*/
max_cons: u8,
/// The maximum number of concurrent transport connections this application will accept
max_req_per_con: u16,
/// The maximum number of concurrent requests this application will accept
con_pool: Connection,
}
impl ConPool {
/// Connect to a FCGI server / application with [`MultiHeaderStrategy::OnlyFirst`] & [`HeaderMultilineStrategy::Ignore`].
/// See [`ConPool::new_with_strategy`]
#[inline]
pub async fn new(sock_addr: &Addr) -> Result<ConPool, Box<dyn Error>> {
Self::new_with_strategy(
sock_addr,
MultiHeaderStrategy::OnlyFirst,
HeaderMultilineStrategy::Ignore,
)
.await
}
/// Connect to a FCGI server / application.
/// Queries [`MAX_CONNS`],
/// [`MAX_REQS`]
/// and [`MPXS_CONNS`] from the server
/// and uses the values to create a [`Connection`].
pub async fn new_with_strategy(
sock_addr: &Addr,
header_mul: MultiHeaderStrategy,
header_nl: HeaderMultilineStrategy,
) -> Result<ConPool, Box<dyn Error>> {
// query VALUES from connection
let stream = Stream::connect(sock_addr).await?;
let mut stream = FCGIWriter::new(stream);
let mut kvw = stream.kv_stream(Record::MGMT_REQUEST_ID, RecordType::GetValues);
kvw.add_kv(MAX_CONNS, Bytes::new()).await?;
kvw.add_kv(MAX_REQS, Bytes::new()).await?;
kvw.add_kv(MPXS_CONNS, Bytes::new()).await?;
kvw.flush().await?;
let mut max_cons = 1;
let mut max_req_per_con = 1;
for rec in send_and_receive(&mut stream).await? {
if let Body::GetValuesResult(kvs) = rec.body {
for kv in kvs.drain() {
match kv.name_data.chunk() {
MAX_CONNS => {
if let Some(v) = parse_int::<u8>(kv.value_data) {
max_cons = v;
}
}
MAX_REQS => {
if let Some(v) = parse_int::<u16>(kv.value_data) {
max_req_per_con = v;
}
}
MPXS_CONNS => {
if kv.value_data == "0" {
max_req_per_con = 1;
break;
}
}
_ => {}
};
}
}
}
info!(
"App supports {} connections with {} requests",
max_cons, max_req_per_con
);
let c = Connection::connect_with_strategy(
&sock_addr,
max_req_per_con,
header_mul,
header_nl
).await?;
Ok(ConPool {
/*
sock_addr,*/
max_cons,
max_req_per_con,
con_pool: c,
})
}
/// Forwards an HTTP request to a FGCI Application.
/// Calls [`Connection::forward`] on an available connection.
pub async fn forward<B, I, P1, P2>(
&self,
req: Request<B>,
dyn_headers: I,
) -> Result<Response<impl HttpBody<Data = Bytes, Error = IoError>>, IoError>
where
B: HttpBody + Unpin,
I: IntoIterator<Item = (P1, P2)>,
P1: Buf,
P2: Buf,
{
self.con_pool.forward(req, dyn_headers).await
}
}
impl fmt::Debug for ConPool {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("ConPool")
.field("max_cons", &self.max_cons)
.field("max_req_per_con", &self.max_req_per_con)
.finish()
}
}
fn parse_int<I: std::str::FromStr>(bytes: Bytes) -> Option<I> {
if let Ok(s) = std::str::from_utf8(bytes.chunk()) {
if let Ok(i) = s.parse() {
return Some(i);
}
}
return None;
}
/// Note: only use this if there are no requests pending
async fn send_and_receive(stream: &mut FCGIWriter<Stream>) -> Result<Vec<Record>, IoError> {
let mut recs = Vec::new();
trace!("prep 4 read");
let mut rbuf = BytesMut::with_capacity(4096);
loop {
stream.read_buf(&mut rbuf).await?;
trace!("got {:?}", rbuf);
let mut pbuf = rbuf.freeze();
while let Some(r) = Record::read(&mut pbuf) {
recs.push(r);
}
if !pbuf.has_remaining() {
break;
}
rbuf = BytesMut::with_capacity(pbuf.len() + 4096);
rbuf.put(pbuf);
}
Ok(recs)
}
#[cfg(feature = "app_start")]
#[cfg_attr(docsrs, doc(cfg(feature = "app_start")))]
impl ConPool {
/// Setup a [`Command`] to spin up a FCGI server / application
/// and make it listen on `sock_addr`.
/// ```no_run
/// # use async_fcgi::{client::con_pool::ConPool,FCGIAddr};
/// # use std::collections::HashMap;
/// # use std::error::Error;
/// # #[tokio::main(flavor = "current_thread")]
/// # async fn main() -> Result<(),Box<dyn Error>> {
/// let mut env = HashMap::new();
/// env.insert("PHP_FCGI_CHILDREN", "16");
/// env.insert("PHP_FCGI_MAX_REQUESTS", "10000");
/// let addr: FCGIAddr = "127.0.0.1:1236".parse()?;
/// let php = ConPool::prep_server("/usr/bin/php-cgi7.4", &addr)
/// .await?
/// .env_clear().envs(env)
/// .spawn()?;
/// # Ok(())
/// # }
/// ```
pub async fn prep_server<S>(program: S, sock_addr: &Addr) -> Result<Command, IoError>
where
S: AsRef<OsStr>,
{
// The Web server leaves a single file descriptor, FCGI_LISTENSOCK_FILENO, open when the application begins execution.
// This descriptor refers to a listening socket created by the Web server.
#[cfg(not(unix))]
let stdin = Stdio::null();
#[cfg(unix)]
let stdin = {
let l = Listener::bind(sock_addr).await?;
let fd = unsafe { Stdio::from_raw_fd(l.as_raw_fd()) };
std::mem::forget(l); // FCGI App closes this - at least php-cgi7.4 does it
fd
};
let mut command = Command::new(program);
command
.stdin(stdin) // FCGI_LISTENSOCK_FILENO equals STDIN_FILENO.
//.stdout(Stdio::null()).stderr(Stdio::null()) // The standard descriptors STDOUT_FILENO and STDERR_FILENO are closed when the application begins execution.
;
Ok(command)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::client::tests::local_socket_pair;
use std::collections::HashMap;
use std::iter::FromIterator;
use std::process::ExitStatus;
use tokio::io::AsyncWriteExt;
use tokio::runtime::Builder;
#[cfg(feature = "app_start")]
#[test]
fn start_app() {
let rt = Builder::new_current_thread().enable_all().build().unwrap();
async fn spawn() {
let mut env = HashMap::new();
env.insert("PATH", "/usr/bin");
let a: Addr = "/tmp/jo".parse().unwrap();
let s: ExitStatus = ConPool::prep_server("ls", &a)
.await
.expect("prep_server error")
.args(&["-l", "-a"])
.env_clear()
.envs(env)
.status()
.await
.expect("ls failed");
assert!(s.success())
}
rt.block_on(spawn());
std::fs::remove_file("/tmp/jo").unwrap();
}
#[test]
fn no_vals() {
//extern crate pretty_env_logger;
//pretty_env_logger::init();
use tokio::net::TcpListener;
// Create the runtime
let rt = Builder::new_current_thread().enable_all().build().unwrap();
async fn mock_app(app_listener: TcpListener) {
let (mut app_socket, _) = app_listener.accept().await.unwrap();
let mut buf = BytesMut::with_capacity(4096);
info!("accepted");
//app_socket.read_buf(&mut buf).await.unwrap();
if let Err(e) = app_socket.read_buf(&mut buf).await {
info!("{}", e);
panic!("could not read");
}
let mut buf = buf.freeze();
trace!("app read {:?}", buf);
let rec = Record::read(&mut buf).unwrap(); //val stream
assert_eq!(rec.get_request_id(), 0);
let v = match rec.body {
Body::GetValues(v) => v,
_ => panic!("wrong body"),
};
let names = Vec::from_iter(v.drain());
assert_eq!(names.len(), 3);
let _ = Record::read(&mut buf).unwrap(); //val stream end
assert!(!buf.has_remaining());
trace!("app answers on get");
let from_php =
b"\x01\x0a\0\0\0!\x07\0\n\0MPXS_CONNS\x08\0MAX_REQS\t\0MAX_CONNS\0\0\0\0\0\0\0";
app_socket
.write_buf(&mut Bytes::from(&from_php[..]))
.await
.unwrap();
let _ = app_listener.accept().await.unwrap();
info!("accepted2");
}
async fn con() {
let (app_listener, a) = local_socket_pair().await.unwrap();
info!("bound");
let m = tokio::spawn(async move {
let a = a.into();
let cp = ConPool::new(&a).await.unwrap();
assert_eq!(cp.max_cons, 1);
assert_eq!(cp.max_req_per_con, 1);
});
mock_app(app_listener).await;
m.await.unwrap();
}
rt.block_on(con());
}
}