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use tokio_util::bytes::BytesMut;
use tokio_util::codec::Decoder;
#[derive(Debug)]
pub enum FcgiDecodedData {
Stdout(Bytes),
Stderr(Bytes),
}
enum FcgiDecodeState {
ReadingHead,
ReadingContent,
Finished,
}
pub struct FcgiDecoder {
header: Vec<u8>,
content_length: u16,
padding_length: u8,
state: FcgiDecodeState,
}
impl FcgiDecoder {
pub fn new() -> Self {
Self {
header: Vec::new(),
content_length: 0,
padding_length: 0,
state: FcgiDecodeState::ReadingHead,
}
}
}
impl Decoder for FcgiDecoder {
type Error = std::io::Error;
type Item = FcgiDecodedData;
fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
loop {
match self.state {
FcgiDecodeState::ReadingHead => {
if src.len() >= 8 {
let header = &src[..8];
self.header = header.to_vec();
src.advance(8);
self.content_length = u16::from_be_bytes(
self.header[4..6]
.try_into()
.map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidInput, e))?,
);
self.padding_length = self.header[6];
self.state = FcgiDecodeState::ReadingContent;
} else {
return Ok(None);
}
}
FcgiDecodeState::ReadingContent => {
if src.len() >= self.content_length as usize + self.padding_length as usize {
let request_id = u16::from_be_bytes(
self.header[2..4]
.try_into()
.map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidInput, e))?,
);
let record_type = self.header[1];
if request_id != 1 || (record_type != 3 && record_type != 6 && record_type != 7) {
// Ignore the record for wrong request ID or if the record isn't END_REQUEST, STDOUT or STDERR
src.advance(self.content_length as usize + self.padding_length as usize);
return Ok(None);
}
let content_borrowed = &src[..(self.content_length as usize)];
let content = content_borrowed.to_vec();
src.advance(self.content_length as usize + self.padding_length as usize);
match record_type {
3 => {
// END_REQUEST record
if content.len() > 5 {
let app_status = u32::from_be_bytes(
content[0..4]
.try_into()
.map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidInput, e))?,
);
let protocol_status = content[4];
match protocol_status {
0 => (),
1 => return Err(std::io::Error::other("FastCGI server overloaded")),
2 => {
return Err(std::io::Error::other(
"Role not supported by the FastCGI application",
))
}
3 => {
return Err(std::io::Error::other(
"Multiplexed connections not supported by the FastCGI application",
))
}
_ => return Err(std::io::Error::other("Unknown error")),
}
self.state = FcgiDecodeState::Finished;
if app_status != 0 {
// Inject data into standard error stream
return Ok(Some(FcgiDecodedData::Stderr(Bytes::from_owner(format!(
"FastCGI application exited with code {}",
app_status
)))));
}
} else {
// Record malformed, ignoring the record
return Ok(None);
}
}
6 => {
// STDOUT record
self.state = FcgiDecodeState::ReadingHead;
if content.is_empty() {
return Ok(None);
}
return Ok(Some(FcgiDecodedData::Stdout(Bytes::from_owner(content))));
}
7 => {
// STDERR record
self.state = FcgiDecodeState::ReadingHead;
if content.is_empty() {
return Ok(None);
}
return Ok(Some(FcgiDecodedData::Stderr(Bytes::from_owner(content))));
}
_ => {
// This should be unreachable
unreachable!()
}
};
} else {
return Ok(None);
}
}
FcgiDecodeState::Finished => {
src.clear();
return Ok(None);
}
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::ferron_util::fcgi_record::construct_fastcgi_record;
use tokio_util::bytes::BytesMut;
use tokio_util::codec::Decoder;
#[test]
fn test_fcgi_decoder_stdout() {
let mut decoder = FcgiDecoder::new();
let mut buf = BytesMut::new();
// Construct a STDOUT record
let record_type = 6;
let request_id = 1;
let content = b"Hello, FastCGI!";
let record = construct_fastcgi_record(record_type, request_id, content);
buf.extend_from_slice(&record);
let result = decoder.decode(&mut buf).unwrap();
assert!(result.is_some());
if let Some(FcgiDecodedData::Stdout(data)) = result {
assert_eq!(&data[..], content);
} else {
panic!("Expected STDOUT data");
}
}
#[test]
fn test_fcgi_decoder_stderr() {
let mut decoder = FcgiDecoder::new();
let mut buf = BytesMut::new();
// Construct a STDERR record
let record_type = 7;
let request_id = 1;
let content = b"Error message";
let record = construct_fastcgi_record(record_type, request_id, content);
buf.extend_from_slice(&record);
let result = decoder.decode(&mut buf).unwrap();
assert!(result.is_some());
if let Some(FcgiDecodedData::Stderr(data)) = result {
assert_eq!(&data[..], content);
} else {
panic!("Expected STDERR data");
}
}
#[test]
fn test_fcgi_decoder_end_request() {
let mut decoder = FcgiDecoder::new();
let mut buf = BytesMut::new();
// Construct an END_REQUEST record
let record_type = 3;
let request_id = 1;
let mut content = [0u8; 4].to_vec(); // App status
content.push(0); // Protocol status
let record = construct_fastcgi_record(record_type, request_id, &content);
buf.extend_from_slice(&record);
let result = decoder.decode(&mut buf).unwrap();
assert!(result.is_none()); // No data for END_REQUEST
}
#[test]
fn test_fcgi_decoder_invalid_record() {
let mut decoder = FcgiDecoder::new();
let mut buf = BytesMut::new();
// Construct an invalid record with wrong request ID
let record_type = 6;
let request_id = 2; // Invalid request ID
let content = b"Invalid record";
let record = construct_fastcgi_record(record_type, request_id, content);
buf.extend_from_slice(&record);
let result = decoder.decode(&mut buf).unwrap();
assert!(result.is_none()); // Invalid record should be ignored
}
}
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