add RPC protocol module (WIP)

This commit is contained in:
Sebastien Bourdeauducq 2020-06-01 18:02:21 +08:00
parent 15b2b253cf
commit 7aa9a95c21
4 changed files with 444 additions and 19 deletions

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@ -1,6 +1,5 @@
use core::{mem::transmute, task::Poll};
use core::mem::transmute;
use core::fmt;
use core::cmp::min;
use core::cell::RefCell;
use alloc::rc::Rc;
use log::{debug, warn, error};
@ -53,23 +52,6 @@ impl From<smoltcp::Error> for Error {
}
}
async fn read_chunk(stream: &TcpStream, destination: &mut [u8]) -> Result<()> {
let total = destination.len();
let destination = RefCell::new(destination);
let mut done = 0;
while done < total {
let count = stream.recv(|buf| {
let mut destination = destination.borrow_mut();
let count = min(total - done, buf.len());
destination[done..done + count].copy_from_slice(&buf[..count]);
Poll::Ready((count, count))
}).await?;
done += count;
}
Ok(())
}
#[derive(Debug, FromPrimitive, ToPrimitive)]
enum Request {
SystemInfo = 3,

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@ -13,6 +13,7 @@ use libsupport_zynq::ram;
mod proto;
mod comms;
mod rpc;
#[path = "../../../build/pl.rs"]
mod pl;
mod rtio;

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@ -1,5 +1,6 @@
use core::task::Poll;
use core::cmp::min;
use core::cell::RefCell;
use libboard_zynq::smoltcp;
use libasync::smoltcp::TcpStream;
@ -49,6 +50,41 @@ pub async fn read_i32(stream: &TcpStream) -> Result<i32> {
}).await?)
}
pub async fn read_i64(stream: &TcpStream) -> Result<i64> {
Ok(stream.recv(|buf| {
if buf.len() >= 8 {
let value =
((buf[0] as i64) << 56)
| ((buf[1] as i64) << 48)
| ((buf[2] as i64) << 40)
| ((buf[3] as i64) << 32)
| ((buf[4] as i64) << 24)
| ((buf[5] as i64) << 16)
| ((buf[6] as i64) << 8)
| (buf[7] as i64);
Poll::Ready((8, value))
} else {
Poll::Pending
}
}).await?)
}
pub async fn read_chunk(stream: &TcpStream, destination: &mut [u8]) -> Result<()> {
let total = destination.len();
let destination = RefCell::new(destination);
let mut done = 0;
while done < total {
let count = stream.recv(|buf| {
let mut destination = destination.borrow_mut();
let count = min(total - done, buf.len());
destination[done..done + count].copy_from_slice(&buf[..count]);
Poll::Ready((count, count))
}).await?;
done += count;
}
Ok(())
}
pub async fn read_drain(stream: &TcpStream, total: usize) -> Result<()> {
let mut done = 0;
while done < total {
@ -74,3 +110,16 @@ pub async fn write_i32(stream: &TcpStream, value: i32) -> Result<()> {
value as u8].iter().copied()).await?;
Ok(())
}
pub async fn write_i64(stream: &TcpStream, value: i64) -> Result<()> {
stream.send([
(value >> 56) as u8,
(value >> 48) as u8,
(value >> 40) as u8,
(value >> 32) as u8,
(value >> 24) as u8,
(value >> 16) as u8,
(value >> 8) as u8,
value as u8].iter().copied()).await?;
Ok(())
}

393
src/runtime/src/rpc.rs Normal file
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@ -0,0 +1,393 @@
use core::str;
use cslice::{CSlice, CMutSlice};
use log::debug;
use libasync::smoltcp::TcpStream;
use crate::proto::*;
use self::tag::{Tag, TagIterator, split_tag};
/* TODO: figure out Rust problems with recursive async fns */
async unsafe fn recv_value(stream: &TcpStream, tag: Tag<'_>, data: &mut *mut (),
alloc: &dyn Fn(usize) -> *mut ())
-> Result<()>
{
macro_rules! consume_value {
($ty:ty, |$ptr:ident| $map:expr) => ({
let $ptr = (*data) as *mut $ty;
*data = $ptr.offset(1) as *mut ();
$map
})
}
match tag {
Tag::None => Ok(()),
Tag::Bool =>
consume_value!(i8, |ptr| {
*ptr = read_i8(stream).await?;
Ok(())
}),
Tag::Int32 =>
consume_value!(i32, |ptr| {
*ptr = read_i32(stream).await?;
Ok(())
}),
Tag::Int64 | Tag::Float64 =>
consume_value!(i64, |ptr| {
*ptr = read_i64(stream).await?;
Ok(())
}),
Tag::String | Tag::Bytes | Tag::ByteArray => {
consume_value!(CMutSlice<u8>, |ptr| {
let length = read_i32(stream).await? as usize;
*ptr = CMutSlice::new(alloc(length) as *mut u8, length);
read_chunk(stream, (*ptr).as_mut()).await?;
Ok(())
})
}
Tag::Tuple(it, arity) => {
let mut it = it.clone();
for _ in 0..arity {
let tag = it.next().expect("truncated tag");
// TODO recv_value(stream, tag, data, alloc).await?
}
Ok(())
}
Tag::List(it) | Tag::Array(it) => {
struct List { elements: *mut (), length: u32 };
consume_value!(List, |ptr| {
(*ptr).length = read_i32(stream).await? as u32;
let tag = it.clone().next().expect("truncated tag");
(*ptr).elements = alloc(tag.size() * (*ptr).length as usize);
let mut data = (*ptr).elements;
for _ in 0..(*ptr).length as usize {
// TODO recv_value(stream, tag, &mut data, alloc).await?
}
Ok(())
})
}
Tag::Range(it) => {
let tag = it.clone().next().expect("truncated tag");
// TODO recv_value(stream, tag, data, alloc).await?;
// TODO recv_value(stream, tag, data, alloc).await?;
// TODO recv_value(stream, tag, data, alloc).await?;
Ok(())
}
Tag::Keyword(_) => unreachable!(),
Tag::Object => unreachable!()
}
}
pub async fn recv_return(stream: &TcpStream, tag_bytes: &[u8], data: *mut (),
alloc: &dyn Fn(usize) -> *mut ())
-> Result<()>
{
let mut it = TagIterator::new(tag_bytes);
debug!("recv ...->{}", it);
let tag = it.next().expect("truncated tag");
let mut data = data;
unsafe { recv_value(stream, tag, &mut data, alloc).await? };
Ok(())
}
async unsafe fn send_value(stream: &TcpStream, tag: Tag<'_>, data: &mut *const ())
-> Result<()>
{
macro_rules! consume_value {
($ty:ty, |$ptr:ident| $map:expr) => ({
let $ptr = (*data) as *const $ty;
*data = $ptr.offset(1) as *const ();
$map
})
}
write_i8(stream, tag.as_u8() as i8).await?;
match tag {
Tag::None => Ok(()),
Tag::Bool =>
consume_value!(i8, |ptr|
write_i8(stream, *ptr).await),
Tag::Int32 =>
consume_value!(i32, |ptr|
write_i32(stream, *ptr).await),
Tag::Int64 | Tag::Float64 =>
consume_value!(i64, |ptr|
write_i64(stream, *ptr).await),
Tag::String =>
//consume_value!(CSlice<u8>, |ptr|
// writer.write_string(str::from_utf8((*ptr).as_ref()).unwrap())),
// TODO
unimplemented!(),
Tag::Bytes | Tag::ByteArray =>
consume_value!(CSlice<u8>, |ptr|
stream.send((*ptr).as_ref().iter().copied()).await),
Tag::Tuple(it, arity) => {
let mut it = it.clone();
write_i8(stream, arity as i8).await?;
for _ in 0..arity {
let tag = it.next().expect("truncated tag");
// TODO send_value(stream, tag, data).await?
}
Ok(())
}
Tag::List(it) | Tag::Array(it) => {
struct List { elements: *const (), length: u32 };
consume_value!(List, |ptr| {
write_i32(stream, (*ptr).length as i32).await?;
let tag = it.clone().next().expect("truncated tag");
let mut data = (*ptr).elements;
for _ in 0..(*ptr).length as usize {
// TODO send_value(stream, tag, &mut data).await?;
}
Ok(())
})
}
Tag::Range(it) => {
let tag = it.clone().next().expect("truncated tag");
// TODO send_value(stream, tag, data).await?;
// TODO send_value(stream, tag, data).await?;
// TODO send_value(stream, tag, data).await?;
Ok(())
}
Tag::Keyword(it) => {
struct Keyword<'a> { name: CSlice<'a, u8> };
consume_value!(Keyword, |ptr| {
//TODO writer.write_string(str::from_utf8((*ptr).name.as_ref()).unwrap())?;
let tag = it.clone().next().expect("truncated tag");
let mut data = ptr.offset(1) as *const ();
// TODO send_value(stream, tag, &mut data).await
Ok(())
})
// Tag::Keyword never appears in composite types, so we don't have
// to accurately advance data.
}
Tag::Object => {
struct Object { id: u32 };
consume_value!(*const Object, |ptr|
write_i32(stream, (**ptr).id as i32).await)
}
}
}
pub async fn send_args(stream: &TcpStream, service: u32, tag_bytes: &[u8], data: *const *const ())
-> Result<()>
{
let (arg_tags_bytes, return_tag_bytes) = split_tag(tag_bytes);
let mut args_it = TagIterator::new(arg_tags_bytes);
let return_it = TagIterator::new(return_tag_bytes);
debug!("send<{}>({})->{}", service, args_it, return_it);
write_i32(stream, service as i32).await?;
for index in 0.. {
if let Some(arg_tag) = args_it.next() {
let mut data = unsafe { *data.offset(index) };
unsafe { send_value(stream, arg_tag, &mut data).await? };
} else {
break
}
}
write_i8(stream, 0).await?;
stream.send(return_tag_bytes.iter().copied()).await?;
Ok(())
}
mod tag {
use core::fmt;
pub fn split_tag(tag_bytes: &[u8]) -> (&[u8], &[u8]) {
let tag_separator =
tag_bytes.iter()
.position(|&b| b == b':')
.expect("tag without a return separator");
let (arg_tags_bytes, rest) = tag_bytes.split_at(tag_separator);
let return_tag_bytes = &rest[1..];
(arg_tags_bytes, return_tag_bytes)
}
#[derive(Debug, Clone, Copy)]
pub enum Tag<'a> {
None,
Bool,
Int32,
Int64,
Float64,
String,
Bytes,
ByteArray,
Tuple(TagIterator<'a>, u8),
List(TagIterator<'a>),
Array(TagIterator<'a>),
Range(TagIterator<'a>),
Keyword(TagIterator<'a>),
Object
}
impl<'a> Tag<'a> {
pub fn as_u8(self) -> u8 {
match self {
Tag::None => b'n',
Tag::Bool => b'b',
Tag::Int32 => b'i',
Tag::Int64 => b'I',
Tag::Float64 => b'f',
Tag::String => b's',
Tag::Bytes => b'B',
Tag::ByteArray => b'A',
Tag::Tuple(_, _) => b't',
Tag::List(_) => b'l',
Tag::Array(_) => b'a',
Tag::Range(_) => b'r',
Tag::Keyword(_) => b'k',
Tag::Object => b'O',
}
}
pub fn size(self) -> usize {
match self {
Tag::None => 0,
Tag::Bool => 1,
Tag::Int32 => 4,
Tag::Int64 => 8,
Tag::Float64 => 8,
Tag::String => 8,
Tag::Bytes => 8,
Tag::ByteArray => 8,
Tag::Tuple(it, arity) => {
let mut size = 0;
let mut it = it.clone();
for _ in 0..arity {
let tag = it.next().expect("truncated tag");
size += tag.size();
}
size
}
Tag::List(_) => 8,
Tag::Array(_) => 8,
Tag::Range(it) => {
let tag = it.clone().next().expect("truncated tag");
tag.size() * 3
}
Tag::Keyword(_) => unreachable!(),
Tag::Object => unreachable!(),
}
}
}
#[derive(Debug, Clone, Copy)]
pub struct TagIterator<'a> {
data: &'a [u8]
}
impl<'a> TagIterator<'a> {
pub fn new(data: &'a [u8]) -> TagIterator<'a> {
TagIterator { data: data }
}
pub fn next(&mut self) -> Option<Tag<'a>> {
if self.data.len() == 0 {
return None
}
let tag_byte = self.data[0];
self.data = &self.data[1..];
Some(match tag_byte {
b'n' => Tag::None,
b'b' => Tag::Bool,
b'i' => Tag::Int32,
b'I' => Tag::Int64,
b'f' => Tag::Float64,
b's' => Tag::String,
b'B' => Tag::Bytes,
b'A' => Tag::ByteArray,
b't' => {
let count = self.data[0];
self.data = &self.data[1..];
Tag::Tuple(self.sub(count), count)
}
b'l' => Tag::List(self.sub(1)),
b'a' => Tag::Array(self.sub(1)),
b'r' => Tag::Range(self.sub(1)),
b'k' => Tag::Keyword(self.sub(1)),
b'O' => Tag::Object,
_ => unreachable!()
})
}
fn sub(&mut self, count: u8) -> TagIterator<'a> {
let data = self.data;
for _ in 0..count {
self.next().expect("truncated tag");
}
TagIterator { data: &data[..(data.len() - self.data.len())] }
}
}
impl<'a> fmt::Display for TagIterator<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut it = self.clone();
let mut first = true;
while let Some(tag) = it.next() {
if first {
first = false
} else {
write!(f, ", ")?
}
match tag {
Tag::None =>
write!(f, "None")?,
Tag::Bool =>
write!(f, "Bool")?,
Tag::Int32 =>
write!(f, "Int32")?,
Tag::Int64 =>
write!(f, "Int64")?,
Tag::Float64 =>
write!(f, "Float64")?,
Tag::String =>
write!(f, "String")?,
Tag::Bytes =>
write!(f, "Bytes")?,
Tag::ByteArray =>
write!(f, "ByteArray")?,
Tag::Tuple(it, _) => {
write!(f, "Tuple(")?;
it.fmt(f)?;
write!(f, ")")?;
}
Tag::List(it) => {
write!(f, "List(")?;
it.fmt(f)?;
write!(f, ")")?;
}
Tag::Array(it) => {
write!(f, "Array(")?;
it.fmt(f)?;
write!(f, ")")?;
}
Tag::Range(it) => {
write!(f, "Range(")?;
it.fmt(f)?;
write!(f, ")")?;
}
Tag::Keyword(it) => {
write!(f, "Keyword(")?;
it.fmt(f)?;
write!(f, ")")?;
}
Tag::Object =>
write!(f, "Object")?,
}
}
Ok(())
}
}
}