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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use deno_core::error::AnyError;
use deno_core::futures::future::FutureExt;
use deno_core::BufVec;
use deno_core::Op;
use deno_core::OpFn;
use deno_core::OpState;
use std::cell::RefCell;
use std::future::Future;
use std::iter::repeat;
use std::mem::size_of_val;
use std::pin::Pin;
use std::rc::Rc;
use std::slice;
pub enum MinimalOp {
Sync(Result<i32, AnyError>),
Async(Pin<Box<dyn Future<Output = Result<i32, AnyError>>>>),
}
#[derive(Copy, Clone, Debug, PartialEq)]
// This corresponds to RecordMinimal on the TS side.
pub struct Record {
pub promise_id: i32,
pub arg: i32,
pub result: i32,
}
impl Into<Box<[u8]>> for Record {
fn into(self) -> Box<[u8]> {
let vec = vec![self.promise_id, self.arg, self.result];
let buf32 = vec.into_boxed_slice();
let ptr = Box::into_raw(buf32) as *mut [u8; 3 * 4];
unsafe { Box::from_raw(ptr) }
}
}
pub struct ErrorRecord {
pub promise_id: i32,
pub arg: i32,
pub error_len: i32,
pub error_class: &'static [u8],
pub error_message: Vec<u8>,
}
impl Into<Box<[u8]>> for ErrorRecord {
fn into(self) -> Box<[u8]> {
let Self {
promise_id,
arg,
error_len,
error_class,
error_message,
..
} = self;
let header_i32 = [promise_id, arg, error_len];
let header_u8 = unsafe {
slice::from_raw_parts(
&header_i32 as *const _ as *const u8,
size_of_val(&header_i32),
)
};
let padded_len =
(header_u8.len() + error_class.len() + error_message.len() + 3usize)
& !3usize;
header_u8
.iter()
.cloned()
.chain(error_class.iter().cloned())
.chain(error_message.into_iter())
.chain(repeat(b' '))
.take(padded_len)
.collect()
}
}
#[test]
fn test_error_record() {
let expected = vec![
1, 0, 0, 0, 255, 255, 255, 255, 11, 0, 0, 0, 66, 97, 100, 82, 101, 115,
111, 117, 114, 99, 101, 69, 114, 114, 111, 114,
];
let err_record = ErrorRecord {
promise_id: 1,
arg: -1,
error_len: 11,
error_class: b"BadResource",
error_message: b"Error".to_vec(),
};
let buf: Box<[u8]> = err_record.into();
assert_eq!(buf, expected.into_boxed_slice());
}
pub fn parse_min_record(bytes: &[u8]) -> Option<Record> {
if bytes.len() % std::mem::size_of::<i32>() != 0 {
return None;
}
let p = bytes.as_ptr();
#[allow(clippy::cast_ptr_alignment)]
let p32 = p as *const i32;
let s = unsafe { std::slice::from_raw_parts(p32, bytes.len() / 4) };
if s.len() != 3 {
return None;
}
let ptr = s.as_ptr();
let ints = unsafe { std::slice::from_raw_parts(ptr, 3) };
Some(Record {
promise_id: ints[0],
arg: ints[1],
result: ints[2],
})
}
#[test]
fn test_parse_min_record() {
let buf = vec![1, 0, 0, 0, 3, 0, 0, 0, 4, 0, 0, 0];
assert_eq!(
parse_min_record(&buf),
Some(Record {
promise_id: 1,
arg: 3,
result: 4
})
);
let buf = vec![];
assert_eq!(parse_min_record(&buf), None);
let buf = vec![5];
assert_eq!(parse_min_record(&buf), None);
}
pub fn minimal_op<F>(op_fn: F) -> Box<OpFn>
where
F: Fn(Rc<RefCell<OpState>>, bool, i32, BufVec) -> MinimalOp + 'static,
{
Box::new(move |state: Rc<RefCell<OpState>>, bufs: BufVec| {
let mut bufs_iter = bufs.into_iter();
let record_buf = bufs_iter.next().expect("Expected record at position 0");
let zero_copy = bufs_iter.collect::<BufVec>();
let mut record = match parse_min_record(&record_buf) {
Some(r) => r,
None => {
let error_class = b"TypeError";
let error_message = b"Unparsable control buffer";
let error_record = ErrorRecord {
promise_id: 0,
arg: -1,
error_len: error_class.len() as i32,
error_class,
error_message: error_message[..].to_owned(),
};
return Op::Sync(error_record.into());
}
};
let is_sync = record.promise_id == 0;
let rid = record.arg;
let min_op = op_fn(state.clone(), is_sync, rid, zero_copy);
match min_op {
MinimalOp::Sync(sync_result) => Op::Sync(match sync_result {
Ok(r) => {
record.result = r;
record.into()
}
Err(err) => {
let error_class = (state.borrow().get_error_class_fn)(&err);
let error_record = ErrorRecord {
promise_id: record.promise_id,
arg: -1,
error_len: error_class.len() as i32,
error_class: error_class.as_bytes(),
error_message: err.to_string().as_bytes().to_owned(),
};
error_record.into()
}
}),
MinimalOp::Async(min_fut) => {
let fut = async move {
match min_fut.await {
Ok(r) => {
record.result = r;
record.into()
}
Err(err) => {
let error_class = (state.borrow().get_error_class_fn)(&err);
let error_record = ErrorRecord {
promise_id: record.promise_id,
arg: -1,
error_len: error_class.len() as i32,
error_class: error_class.as_bytes(),
error_message: err.to_string().as_bytes().to_owned(),
};
error_record.into()
}
}
};
Op::Async(fut.boxed_local())
}
}
})
}
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