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use std::sync::Arc;
use bytes::BufMut;
use interprocess::unnamed_pipe::{Recver, Sender};
use tokio::sync::Mutex;
use crate::ferron_util::preforked_process_pool::{read_ipc_message, write_ipc_message};
use crate::ferron_util::wsgid_message_structs::{
ProcessPoolToServerMessage, ServerToProcessPoolMessage,
};
pub struct WsgidBodyReader {
ipc_tx: Arc<Mutex<Sender>>,
ipc_rx: Arc<Mutex<Recver>>,
buffer: Vec<u8>,
finished: bool,
}
impl WsgidBodyReader {
pub fn new(ipc_tx: Arc<Mutex<Sender>>, ipc_rx: Arc<Mutex<Recver>>) -> Self {
Self {
ipc_tx,
ipc_rx,
buffer: Vec::new(),
finished: false,
}
}
}
impl Read for WsgidBodyReader {
fn read(&mut self, mut buf: &mut [u8]) -> std::io::Result<usize> {
if !self.buffer.is_empty() {
let slice_len = std::cmp::min(buf.remaining_mut(), self.buffer.len());
buf.put_slice(&self.buffer[0..slice_len]);
self.buffer.clear();
Ok(slice_len)
} else if self.finished {
Ok(0)
} else {
let rx = &mut self.ipc_rx.blocking_lock();
let tx = &mut self.ipc_tx.blocking_lock();
let mut body_fill_with = Vec::new();
loop {
write_ipc_message(
tx,
&postcard::to_allocvec::<ProcessPoolToServerMessage>(&ProcessPoolToServerMessage {
application_id: None,
status_code: None,
headers: None,
body_chunk: None,
error_log_line: None,
error_message: None,
requests_body_chunk: true,
})
.map_err(|e| std::io::Error::other(e.to_string()))?,
)?;
let received_message =
postcard::from_bytes::<ServerToProcessPoolMessage>(&read_ipc_message(rx)?)
.map_err(|e| std::io::Error::other(e.to_string()))?;
if let Some(body_error_message) = received_message.body_error_message {
return Err(std::io::Error::other(body_error_message));
} else if let Some(body_chunk) = received_message.body_chunk {
body_fill_with.extend_from_slice(&body_chunk);
if body_fill_with.len() >= buf.remaining_mut() {
break;
}
} else {
self.finished = true;
break;
}
}
let slice_len = std::cmp::min(buf.len(), body_fill_with.len());
buf.put_slice(&body_fill_with[0..slice_len]);
if slice_len < body_fill_with.len() {
self
.buffer
.extend_from_slice(&body_fill_with[slice_len..body_fill_with.len()]);
}
Ok(slice_len)
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_read_from_ipc() {
let (tx_inner, mut rx_outer) = interprocess::unnamed_pipe::pipe().unwrap();
let (mut tx_outer, rx_inner) = interprocess::unnamed_pipe::pipe().unwrap();
let mut reader = WsgidBodyReader::new(
Arc::new(Mutex::new(tx_inner)),
Arc::new(Mutex::new(rx_inner)),
);
let input = b"Some data";
write_ipc_message(
&mut tx_outer,
&postcard::to_allocvec(&ServerToProcessPoolMessage {
application_id: None,
environment_variables: None,
body_chunk: Some(input.to_vec()),
body_error_message: None,
requests_body_chunk: false,
})
.unwrap(),
)
.unwrap();
write_ipc_message(
&mut tx_outer,
&postcard::to_allocvec(&ServerToProcessPoolMessage {
application_id: None,
environment_variables: None,
body_chunk: None,
body_error_message: None,
requests_body_chunk: false,
})
.unwrap(),
)
.unwrap();
let mut buffer = [0u8; 128];
let read_bytes = reader.read(&mut buffer).unwrap();
assert_eq!(read_bytes, input.len());
assert_eq!(&input[0..read_bytes], input);
let received_message =
postcard::from_bytes::<ProcessPoolToServerMessage>(&read_ipc_message(&mut rx_outer).unwrap())
.unwrap();
assert!(received_message.requests_body_chunk);
let received_message =
postcard::from_bytes::<ProcessPoolToServerMessage>(&read_ipc_message(&mut rx_outer).unwrap())
.unwrap();
assert!(received_message.requests_body_chunk);
}
#[test]
fn test_empty_input() {
let (tx_inner, _rx_outer) = interprocess::unnamed_pipe::pipe().unwrap();
let (mut tx_outer, rx_inner) = interprocess::unnamed_pipe::pipe().unwrap();
let mut reader = WsgidBodyReader::new(
Arc::new(Mutex::new(tx_inner)),
Arc::new(Mutex::new(rx_inner)),
);
write_ipc_message(
&mut tx_outer,
&postcard::to_allocvec(&ServerToProcessPoolMessage {
application_id: None,
environment_variables: None,
body_chunk: None,
body_error_message: None,
requests_body_chunk: false,
})
.unwrap(),
)
.unwrap();
// Simulate receiving no data
let mut buffer = [0u8; 128];
let read_bytes = reader.read(&mut buffer).unwrap();
assert_eq!(read_bytes, 0);
}
#[test]
fn test_multiple_chunks() {
let (tx_inner, _rx_outer) = interprocess::unnamed_pipe::pipe().unwrap();
let (mut tx_outer, rx_inner) = interprocess::unnamed_pipe::pipe().unwrap();
let mut reader = WsgidBodyReader::new(
Arc::new(Mutex::new(tx_inner)),
Arc::new(Mutex::new(rx_inner)),
);
let input1 = b"First chunk ";
let input2 = b"Second chunk";
for chunk in &[input1, input2] {
write_ipc_message(
&mut tx_outer,
&postcard::to_allocvec(&ServerToProcessPoolMessage {
application_id: None,
environment_variables: None,
body_chunk: Some(chunk.to_vec()),
body_error_message: None,
requests_body_chunk: false,
})
.unwrap(),
)
.unwrap();
}
write_ipc_message(
&mut tx_outer,
&postcard::to_allocvec(&ServerToProcessPoolMessage {
application_id: None,
environment_variables: None,
body_chunk: None,
body_error_message: None,
requests_body_chunk: false,
})
.unwrap(),
)
.unwrap();
let mut buffer = [0u8; 64];
let mut total_read = 0;
loop {
let bytes_read = reader.read(&mut buffer[total_read..]).unwrap();
if bytes_read == 0 {
break;
}
total_read += bytes_read;
}
let expected = [input1.to_owned(), input2.to_owned()].concat();
assert_eq!(&buffer[..total_read], &expected[..]);
}
#[test]
fn test_error_message() {
let (tx_inner, _rx_outer) = interprocess::unnamed_pipe::pipe().unwrap();
let (mut tx_outer, rx_inner) = interprocess::unnamed_pipe::pipe().unwrap();
let mut reader = WsgidBodyReader::new(
Arc::new(Mutex::new(tx_inner)),
Arc::new(Mutex::new(rx_inner)),
);
let error_message = "something went wrong".to_string();
write_ipc_message(
&mut tx_outer,
&postcard::to_allocvec(&ServerToProcessPoolMessage {
application_id: None,
environment_variables: None,
body_chunk: None,
body_error_message: Some(error_message.clone()),
requests_body_chunk: false,
})
.unwrap(),
)
.unwrap();
let mut buffer = [0u8; 128];
let result = reader.read(&mut buffer);
assert!(result.is_err());
assert_eq!(result.unwrap_err().to_string(), error_message);
}
#[test]
fn test_buffering_behavior() {
let (tx_inner, _rx_outer) = interprocess::unnamed_pipe::pipe().unwrap();
let (mut tx_outer, rx_inner) = interprocess::unnamed_pipe::pipe().unwrap();
let mut reader = WsgidBodyReader::new(
Arc::new(Mutex::new(tx_inner)),
Arc::new(Mutex::new(rx_inner)),
);
let data = b"This is a long chunk of data";
write_ipc_message(
&mut tx_outer,
&postcard::to_allocvec(&ServerToProcessPoolMessage {
application_id: None,
environment_variables: None,
body_chunk: Some(data.to_vec()),
body_error_message: None,
requests_body_chunk: false,
})
.unwrap(),
)
.unwrap();
write_ipc_message(
&mut tx_outer,
&postcard::to_allocvec(&ServerToProcessPoolMessage {
application_id: None,
environment_variables: None,
body_chunk: None,
body_error_message: None,
requests_body_chunk: false,
})
.unwrap(),
)
.unwrap();
let mut buf1 = [0u8; 10];
let mut buf2 = [0u8; 64];
let n1 = reader.read(&mut buf1).unwrap();
assert_eq!(&buf1[..n1], &data[..n1]);
let n2 = reader.read(&mut buf2).unwrap();
let expected_remainder = &data[n1..];
assert_eq!(&buf2[..n2], expected_remainder);
}
}
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