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//! Primary and Secondary client and server for use with Unix Sockets.
use crate::{
Error, StdIo, UrapPrimary as UrapPrimaryProto, UrapSecondary as UrapSecondaryProto, Read, Write,
URAP_DATA_WIDTH, URAP_HEAD_WIDTH, URAP_REG_WIDTH, URAP_COUNT_MAX, URAP_CRC_WIDTH, NakCode,
};
use std::{
net::Shutdown,
os::unix::net::{UnixListener, UnixStream},
sync::{Arc, Mutex},
thread::{self, JoinHandle},
vec::Vec,
time::Duration,
};
pub struct UrapSecondary {
pub errors: Arc<Mutex<Vec<Error<std::io::Error>>>>,
pub join_handle: JoinHandle<Result<(), std::io::Error>>,
}
impl UrapSecondary {
pub fn spawn<const REGCNT: usize>(
path: &str,
registers: Arc<Mutex<[[u8; URAP_DATA_WIDTH]; REGCNT]>>,
writeprotect: [bool; REGCNT],
) -> Result<Self, Error<std::io::Error>> {
let listener = UnixListener::bind(path)?;
let errors: Arc<Mutex<Vec<Error<std::io::Error>>>> = Arc::new(Mutex::new(Vec::new()));
let error_cpy = errors.clone();
let join_handle = thread::spawn(move || loop {
for stream in listener.incoming() {
match stream {
Ok(stream) => {
let regcopy = registers.clone();
let error_cpy = error_cpy.clone();
stream.set_nonblocking(false).unwrap();
thread::spawn(move || {
let mut stream: StdIo<UnixStream> = stream.into();
loop {
let mut errors = error_cpy.lock().unwrap();
if let Some(e) = stream.get_inner().take_error().unwrap_or(None) {
errors.push(e.into());
// Terminate the connection if there's an error, to prevent
// either side from hanging
stream
.get_inner_mut()
.shutdown(Shutdown::Both)
.unwrap_or_default();
drop(errors);
return;
}
drop(errors);
let mut urap_secondary = UrapSecondaryProto::new(
&mut stream,
&writeprotect,
);
let result = urap_secondary.poll();
let mut errors = error_cpy.lock().unwrap();
if let Err(e) = result {
errors.push(e);
// Terminate the connection if there's an error, to prevent
// either side from hanging
stream
.get_inner_mut()
.shutdown(Shutdown::Both)
.unwrap_or_default();
drop(errors);
return;
} else if let Ok(result) = result {
if let Some(packet) = result {
let nak_code = packet.nak_code.clone();
if let Some(nak_code) = nak_code {
let e = match nak_code {
NakCode::SecondaryFailure => Error::SecondaryFailure,
NakCode::BadCrc => Error::BadCrc,
NakCode::OutOfBounds => Error::OutOfBounds(packet.start_register),
NakCode::IncompletePacket => Error::IncompletePacket,
NakCode::IndexWriteProtected => Error::IndexWriteProtected(packet.count, packet.start_register),
NakCode::CountExceedsBounds => Error::CountExceedsBounds(packet.count, packet.start_register),
NakCode::Unknown => panic!("Unknown NAK code!"),
};
errors.push(e);
}
let mut registers = regcopy.lock().unwrap();
let result = urap_secondary.process(packet, &mut registers);
if let Err(e) = result {
errors.push(e);
// Terminate the connection if there's an error, to prevent
// either side from hanging
stream
.get_inner_mut()
.shutdown(Shutdown::Both)
.unwrap_or_default();
drop(registers);
drop(errors);
return;
}
if nak_code.is_some() {
// Terminate the connection if there's an error, to prevent
// either side from hanging
stream
.get_inner_mut()
.shutdown(Shutdown::Both)
.unwrap_or_default();
drop(registers);
drop(errors);
return;
}
drop(registers)
} else { // If no bytes are read, we reached the end of file
// and the pipe has been shut down. Kill the thread
// and return.
drop(errors);
return;
}
}
drop(errors);
}
});
}
Err(_) => {}
}
}
});
Ok(Self {
errors,
join_handle,
})
}
pub fn pop_error(&mut self) -> Option<Error<std::io::Error>> {
let mut errors = self.errors.lock().unwrap();
let error = errors.pop();
drop(errors);
error
}
}
pub struct UrapPrimary {
socket: StdIo<UnixStream>,
}
impl UrapPrimary {
pub fn new(path: &str) -> Result<Self, std::io::Error> {
let socket = UnixStream::connect(path)?;
socket.set_nonblocking(false).unwrap();
let socket = socket.into();
Ok(Self { socket })
}
#[inline]
pub fn read_4u8(&mut self, register: u16, buffer: &mut [[u8; URAP_DATA_WIDTH]]) -> Result<(), Error<std::io::Error>> {
UrapPrimaryProto::new(&mut self.socket).read_4u8(register, buffer)
}
//#[inline]
//pub fn read_f32(&mut self, register: u16) -> Result<f32, Error<std::io::Error>> {
// UrapPrimaryProto::new(&mut self.socket).read_f32(register)
//}
//#[inline]
//pub fn read_u32(&mut self, register: u16) -> Result<u32, Error<std::io::Error>> {
// UrapPrimaryProto::new(&mut self.socket).read_u32(register)
//}
//#[inline]
//pub fn read_i32(&mut self, register: u16) -> Result<i32, Error<std::io::Error>> {
// UrapPrimaryProto::new(&mut self.socket).read_i32(register)
//}
#[inline]
pub fn write_4u8(
&mut self,
start_register: u16,
data: &[[u8; 4]],
) -> Result<(), Error<std::io::Error>> {
UrapPrimaryProto::new(&mut self.socket).write_4u8(start_register, data)
}
//#[inline]
//pub fn write_f32(&mut self, register: u16, num: f32) -> Result<(), Error<std::io::Error>> {
// UrapPrimaryProto::new(&mut self.socket).write_f32(register, num)
//}
//#[inline]
//pub fn write_u32(&mut self, register: u16, num: u32) -> Result<(), Error<std::io::Error>> {
// UrapPrimaryProto::new(&mut self.socket).write_u32(register, num)
//}
//#[inline]
//pub fn write_i32(&mut self, register: u16, num: i32) -> Result<(), Error<std::io::Error>> {
// UrapPrimaryProto::new(&mut self.socket).write_i32(register, num)
//}
#[inline]
pub fn is_healthy(&mut self) -> bool {
UrapPrimaryProto::new(&mut self.socket).is_healthy()
}
}
impl Drop for UrapPrimary {
fn drop(&mut self) {
self.socket
.get_inner_mut()
.shutdown(Shutdown::Both)
.unwrap_or_default();
}
}
#[cfg(test)]
mod tests {
use std::{fs::remove_file, path::Path};
use super::*;
static SLAVE_PATH: &str = "test.socket";
#[test]
fn unix_sockets() {
const RCOUNT: usize = u16::MAX as usize;
let registers = Arc::new(Mutex::new([[0u8; URAP_DATA_WIDTH]; RCOUNT]));
let mut write_protect: [bool; RCOUNT] = [false; RCOUNT];
write_protect[2] = true;
let secondary_path = Path::new(SLAVE_PATH);
if secondary_path.exists() {
remove_file(secondary_path).unwrap();
}
let mut urap_secondary =
UrapSecondary::spawn(SLAVE_PATH, registers.clone(), write_protect).unwrap();
let mut urap_primary = UrapPrimary::new(SLAVE_PATH).unwrap();
assert!(urap_primary.is_healthy());
for error in urap_secondary.errors.lock().unwrap().iter() {
panic!("{}", error);
}
let mut buffer: [[u8; URAP_DATA_WIDTH]; 3] = [[0; URAP_DATA_WIDTH]; 3];
urap_primary.read_4u8(0, &mut buffer).unwrap();
urap_primary.write_4u8(0, &[
f32::INFINITY.to_le_bytes(),
42_u32.to_le_bytes(),
]).unwrap();
urap_primary.write_4u8(2, &[
(-1_i32).to_le_bytes(),
]).unwrap_err();
let error = urap_secondary.pop_error().unwrap();
match error {
Error::IndexWriteProtected(_, _) => {}
_ => {
panic!("Incorrect Error Returned! {}", error)
}
}
let mut urap_primary = UrapPrimary::new(SLAVE_PATH).unwrap();
urap_primary.write_4u8(u16::MAX, &[f32::INFINITY.to_le_bytes()]).unwrap_err();
let error = urap_secondary.pop_error().unwrap();
match error {
Error::OutOfBounds(_) => {}
_ => {
panic!("Incorrect Error Returned! {}", error)
}
}
let mut urap_primary = UrapPrimary::new(SLAVE_PATH).unwrap();
urap_primary.write_4u8(u16::MAX-2, &mut buffer).unwrap_err();
let error = urap_secondary.pop_error().unwrap();
match error {
Error::CountExceedsBounds(_, _) => {}
_ => {
panic!("Incorrect Error Returned! {}", error)
}
}
let mut urap_primary = UrapPrimary::new(SLAVE_PATH).unwrap();
urap_primary.write_4u8(u16::MAX -1, &[f32::INFINITY.to_le_bytes()]).unwrap();
let mut registers = registers.lock().unwrap();
assert_eq!(registers[0], f32::INFINITY.to_le_bytes());
assert_eq!(registers[1], 42_u32.to_le_bytes());
assert_eq!(registers[2], 0_i32.to_le_bytes());
assert_eq!(registers[u16::MAX as usize - 1], f32::INFINITY.to_le_bytes());
registers[2] = (-1_i32).to_le_bytes();
drop(registers);
urap_primary.read_4u8(0, &mut buffer).unwrap();
assert_eq!(f32::from_le_bytes(buffer[0]), f32::INFINITY);
assert_eq!(u32::from_le_bytes(buffer[1]), 42);
assert_eq!(i32::from_le_bytes(buffer[2]), -1);
let mut buffer: [[u8; URAP_DATA_WIDTH]; URAP_COUNT_MAX] = [[0; URAP_DATA_WIDTH]; URAP_COUNT_MAX];
urap_primary.write_4u8(128, &buffer).unwrap();
let mut urap_primary_2 = UrapPrimary::new(SLAVE_PATH).unwrap();
urap_primary_2.write_4u8(0, &[f32::INFINITY.to_le_bytes()]).unwrap();
urap_primary_2.read_4u8(0, &mut buffer[..1]).unwrap();
assert_eq!(f32::from_le_bytes(buffer[0]), f32::INFINITY);
urap_primary.read_4u8(128, &mut buffer).unwrap();
if let Some(e) = urap_secondary.pop_error() {
panic!("{}", e);
}
drop(urap_secondary);
if secondary_path.exists() {
remove_file(secondary_path).unwrap();
}
}
}