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Rust: add basic RPC support.

This commit is contained in:
whitequark 2016-10-05 14:15:53 +00:00
parent 0a29c00fcc
commit 4cfc4e89b9
6 changed files with 262 additions and 25 deletions
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6
artiq/runtime.rs/src/kernel_proto.rs
View File

@ -38,6 +38,7 @@ pub enum Message<'a> {
RpcSend {
service: u32,
batch: bool,
tag: &'a [u8],
data: *const *const ()
},
@ -182,10 +183,11 @@ impl<'a> Message<'a> {
Message::WatchdogClear { id: (*msg).id as usize }
}
c::Type::RpcSend => {
c::Type::RpcSend | c::Type::RpcBatch => {
let msg = ptr as *const c::RpcSend;
Message::RpcSend {
service: (*msg).service as _,
batch: (*msg).ty == c::Type::RpcBatch,
tag: slice::from_raw_parts((*msg).tag as *const _,
c::strlen((*msg).tag) as usize),
data: (*msg).data as *const _
@ -248,7 +250,7 @@ mod c {
extern { pub fn strlen(ptr: *const c_char) -> size_t; }
#[repr(u32)]
#[derive(Debug)]
#[derive(Debug, PartialEq, Eq)]
#[allow(dead_code)]
pub enum Type {
LoadRequest,

3
artiq/runtime.rs/src/lib.rs
View File

@ -31,6 +31,7 @@ mod moninj_proto;
mod analyzer_proto;
mod kernel;
mod rpc;
mod session;
mod moninj;
#[cfg(has_rtio_analyzer)]
@ -57,7 +58,7 @@ pub unsafe extern fn rust_main() {
network_init();
let mut scheduler = sched::Scheduler::new();
scheduler.spawner().spawn(8192, session::thread);
scheduler.spawner().spawn(16384, session::thread);
scheduler.spawner().spawn(4096, moninj::thread);
#[cfg(has_rtio_analyzer)]
scheduler.spawner().spawn(4096, analyzer::thread);

13
artiq/runtime.rs/src/proto.rs
View File

@ -1,6 +1,7 @@
#![allow(dead_code)]
use std::io::{self, Read, Write};
use std::vec::Vec;
use byteorder::{ByteOrder, NetworkEndian};
// FIXME: replace these with byteorder core io traits once those are in
@ -50,3 +51,15 @@ pub fn write_u64(writer: &mut Write, value: u64) -> io::Result<()> {
NetworkEndian::write_u64(&mut bytes, value);
writer.write_all(&bytes)
}
pub fn read_bytes(reader: &mut Read) -> io::Result<Vec<u8>> {
let length = try!(read_u32(reader));
let mut value = vec![0; length as usize];
try!(reader.read_exact(&mut value));
Ok(value)
}
pub fn write_bytes(writer: &mut Write, value: &[u8]) -> io::Result<()> {
try!(write_u32(writer, value.len() as u32));
writer.write_all(value)
}

187
artiq/runtime.rs/src/rpc.rs Normal file
View File

@ -0,0 +1,187 @@
use std::io::{self, Read, Write};
use proto::{write_u8, write_bytes};
use self::tag::{Tag, TagIterator, split_tag};
fn recv_value(reader: &mut Read, tag: Tag, data: &mut *const ()) -> io::Result<()> {
match tag {
Tag::None => Ok(()),
_ => unreachable!()
}
}
pub fn recv_return(reader: &mut Read, tag_bytes: &[u8], data: *const ()) -> io::Result<()> {
let mut it = TagIterator::new(tag_bytes);
trace!("recv ...->{}", it);
let mut data = data;
try!(recv_value(reader, it.next().expect("RPC without a return value"), &mut data));
Ok(())
}
fn send_value(writer: &mut Write, tag: Tag, data: &mut *const ()) -> io::Result<()> {
match tag {
Tag::None => write_u8(writer, b'n'),
_ => unreachable!()
}
}
pub fn send_args(writer: &mut Write, tag_bytes: &[u8],
data: *const *const ()) -> io::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);
trace!("send ({})->{}", args_it, return_it);
for index in 0.. {
if let Some(arg_tag) = args_it.next() {
let mut data = unsafe { *data.offset(index) };
try!(send_value(writer, arg_tag, &mut data));
} else {
break
}
}
try!(write_u8(writer, 0));
try!(write_bytes(writer, return_tag_bytes));
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)]
pub enum Tag<'a> {
None,
Bool,
Int32,
Int64,
Float64,
String,
Tuple(TagIterator<'a>, u8),
List(TagIterator<'a>),
Array(TagIterator<'a>),
Range(TagIterator<'a>),
Keyword(TagIterator<'a>),
Object
}
#[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't' => {
let count = self.data[0];
self.data = &self.data[1..];
Tag::Tuple(self.skip(count), count)
}
b'l' => Tag::List(self.skip(1)),
b'a' => Tag::Array(self.skip(1)),
b'r' => Tag::Range(self.skip(1)),
b'k' => Tag::Keyword(self.skip(1)),
b'O' => Tag::Object,
_ => unreachable!()
})
}
fn skip(&mut self, count: u8) -> TagIterator<'a> {
let origin = self.clone();
for _ in 0..count {
self.next().expect("truncated tag");
}
origin
}
}
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 {
try!(write!(f, ", "))
}
match tag {
Tag::None =>
try!(write!(f, "None")),
Tag::Bool =>
try!(write!(f, "Bool")),
Tag::Int32 =>
try!(write!(f, "Int32")),
Tag::Int64 =>
try!(write!(f, "Int64")),
Tag::Float64 =>
try!(write!(f, "Float64")),
Tag::String =>
try!(write!(f, "String")),
Tag::Tuple(it, cnt) => {
try!(write!(f, "Tuple("));
for i in 0..cnt {
try!(it.fmt(f));
if i != cnt - 1 { try!(write!(f, ", ")) }
}
try!(write!(f, ")"))
}
Tag::List(it) => {
try!(write!(f, "List("));
try!(it.fmt(f));
try!(write!(f, ")"))
}
Tag::Array(it) => {
try!(write!(f, "Array("));
try!(it.fmt(f));
try!(write!(f, ")"))
}
Tag::Range(it) => {
try!(write!(f, "Range("));
try!(it.fmt(f));
try!(write!(f, ")"))
}
Tag::Keyword(it) => {
try!(write!(f, "Keyword("));
try!(it.fmt(f));
try!(write!(f, ")"))
}
Tag::Object =>
try!(write!(f, "Object"))
}
}
Ok(())
}
}
}

48
artiq/runtime.rs/src/session.rs
View File

@ -9,6 +9,7 @@ use urc::Urc;
use sched::{ThreadHandle, Waiter, Spawner};
use sched::{TcpListener, TcpStream, SocketAddr, IP_ANY};
use rpc;
use session_proto as host;
use kernel_proto as kern;
@ -230,11 +231,33 @@ fn process_host_message(waiter: Waiter,
Err(_) => host_write(stream, host::Reply::KernelStartupFailed)
},
host::Request::RpcReply { tag, data } => {
if session.kernel_state != KernelState::RpcWait {
unexpected!("unsolicited RPC reply")
}
try!(kern_recv(waiter, |reply| {
match reply {
kern::RpcRecvRequest { slot } => {
let mut data = io::Cursor::new(data);
rpc::recv_return(&mut data, &tag, slot)
}
other =>
unexpected!("unexpected reply from kernel CPU: {:?}", other)
}
}));
try!(kern_send(waiter, kern::RpcRecvReply { alloc_size: 0, exception: None }));
session.kernel_state = KernelState::Running;
Ok(())
}
request => unexpected!("unexpected request {:?} from host machine", request)
}
}
fn process_kern_message(waiter: Waiter,
mut stream: Option<&mut TcpStream>,
session: &mut Session) -> io::Result<bool> {
kern::Message::wait_and_receive(waiter, |request| {
match (&request, session.kernel_state) {
@ -276,6 +299,24 @@ fn process_kern_message(waiter: Waiter,
kern_acknowledge()
}
kern::RpcSend { service, batch, tag, data } => {
match stream {
None => unexpected!("unexpected RPC in flash kernel"),
Some(ref mut stream) => {
let mut buf = Vec::new();
try!(rpc::send_args(&mut buf, tag, data));
try!(host_write(stream, host::Reply::RpcRequest {
service: service,
data: &buf[..]
}));
if !batch {
session.kernel_state = KernelState::RpcWait
}
kern_acknowledge()
}
}
}
kern::CacheGetRequest { key } => {
let value = session.congress.cache.get(key);
kern_send(waiter, kern::CacheGetReply {
@ -289,6 +330,7 @@ fn process_kern_message(waiter: Waiter,
}
kern::RunFinished => {
try!(kern_acknowledge());
session.kernel_state = KernelState::Absent;
return Ok(true)
}
@ -309,7 +351,7 @@ fn host_kernel_worker(waiter: Waiter,
}
if mailbox::receive() != 0 {
if try!(process_kern_message(waiter, &mut session)) {
if try!(process_kern_message(waiter, Some(stream), &mut session)) {
try!(host_write(stream, host::Reply::KernelFinished))
}
}
@ -345,7 +387,7 @@ fn flash_kernel_worker(waiter: Waiter,
loop {
if mailbox::receive() != 0 {
if try!(process_kern_message(waiter, &mut session)) {
if try!(process_kern_message(waiter, None, &mut session)) {
return Ok(())
}
}
@ -376,7 +418,7 @@ fn respawn<F>(spawner: Spawner, waiter: Waiter,
}
}
*handle = Some(spawner.spawn(8192, f))
*handle = Some(spawner.spawn(16384, f))
}
pub fn thread(waiter: Waiter, spawner: Spawner) {

30
artiq/runtime.rs/src/session_proto.rs
View File

@ -2,18 +2,6 @@ use std::prelude::v1::*;
use std::io::{self, Read, Write};
use proto::*;
fn read_bytes(reader: &mut Read) -> io::Result<Vec<u8>> {
let length = try!(read_u32(reader));
let mut value = vec![0; length as usize];
try!(reader.read_exact(&mut value));
Ok(value)
}
fn write_bytes(writer: &mut Write, value: &[u8]) -> io::Result<()> {
try!(write_u32(writer, value.len() as u32));
writer.write_all(value)
}
fn read_string(reader: &mut Read) -> io::Result<String> {
let mut bytes = try!(read_bytes(reader));
let len = bytes.len() - 1; // length without trailing \0
@ -89,7 +77,7 @@ pub enum Request {
LoadKernel(Vec<u8>),
RunKernel,
RpcReply { tag: String }, // FIXME
RpcReply { tag: Vec<u8>, data: Vec<u8> },
RpcException(Exception),
FlashRead { key: String },
@ -115,11 +103,14 @@ impl Request {
let mut code = vec![0; length - HEADER_SIZE];
try!(reader.read_exact(&mut code));
Request::LoadKernel(code)
},
}
6 => Request::RunKernel,
7 => Request::RpcReply {
tag: try!(read_string(reader))
},
7 => {
let tag = try!(read_bytes(reader));
let mut data = vec![0; length - HEADER_SIZE - 4 - tag.len()];
try!(reader.read_exact(&mut data));
Request::RpcReply { tag: tag, data: data }
}
8 => Request::RpcException(try!(Exception::read_from(reader))),
9 => Request::FlashRead {
key: try!(read_string(reader))
@ -152,7 +143,7 @@ pub enum Reply<'a> {
KernelStartupFailed,
KernelException(Exception),
RpcRequest { service: u32 },
RpcRequest { service: u32, data: &'a [u8] },
FlashRead(&'a [u8]),
FlashOk,
@ -204,9 +195,10 @@ impl<'a> Reply<'a> {
try!(exception.write_to(writer));
},
Reply::RpcRequest { service } => {
Reply::RpcRequest { service, data } => {
try!(write_u8(&mut buf, 10));
try!(write_u32(&mut buf, service));
try!(buf.write(data));
},
Reply::FlashRead(ref bytes) => {