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https://github.com/denoland/deno.git
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176 lines
4.7 KiB
Rust
176 lines
4.7 KiB
Rust
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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// Do not add flatbuffer dependencies to this module.
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//! Connects to js/dispatch_minimal.ts sendAsyncMinimal This acts as a faster
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//! alternative to flatbuffers using a very simple list of int32s to lay out
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//! messages. The first i32 is used to determine if a message a flatbuffer
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//! message or a "minimal" message.
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use crate::op_error::OpError;
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use byteorder::{LittleEndian, WriteBytesExt};
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use deno_core::Buf;
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use deno_core::Op;
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use deno_core::ZeroCopyBuf;
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use futures::future::FutureExt;
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use std::future::Future;
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use std::pin::Pin;
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pub enum MinimalOp {
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Sync(Result<i32, OpError>),
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Async(Pin<Box<dyn Future<Output = Result<i32, OpError>>>>),
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}
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#[derive(Copy, Clone, Debug, PartialEq)]
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// This corresponds to RecordMinimal on the TS side.
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pub struct Record {
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pub promise_id: i32,
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pub arg: i32,
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pub result: i32,
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}
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impl Into<Buf> for Record {
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fn into(self) -> Buf {
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let vec = vec![self.promise_id, self.arg, self.result];
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let buf32 = vec.into_boxed_slice();
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let ptr = Box::into_raw(buf32) as *mut [u8; 3 * 4];
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unsafe { Box::from_raw(ptr) }
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}
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}
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pub struct ErrorRecord {
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pub promise_id: i32,
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pub arg: i32,
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pub error_code: i32,
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pub error_message: Vec<u8>,
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}
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impl Into<Buf> for ErrorRecord {
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fn into(self) -> Buf {
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let v32: Vec<i32> = vec![self.promise_id, self.arg, self.error_code];
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let mut v8: Vec<u8> = Vec::new();
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for n in v32 {
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v8.write_i32::<LittleEndian>(n).unwrap();
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}
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let mut message = self.error_message;
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// Align to 32bit word, padding with the space character.
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message.resize((message.len() + 3usize) & !3usize, b' ');
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v8.append(&mut message);
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v8.into_boxed_slice()
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}
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}
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#[test]
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fn test_error_record() {
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let expected = vec![
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1, 0, 0, 0, 255, 255, 255, 255, 10, 0, 0, 0, 69, 114, 114, 111, 114, 32,
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32, 32,
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];
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let err_record = ErrorRecord {
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promise_id: 1,
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arg: -1,
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error_code: 10,
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error_message: "Error".to_string().as_bytes().to_owned(),
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};
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let buf: Buf = err_record.into();
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assert_eq!(buf, expected.into_boxed_slice());
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}
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pub fn parse_min_record(bytes: &[u8]) -> Option<Record> {
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if bytes.len() % std::mem::size_of::<i32>() != 0 {
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return None;
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}
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let p = bytes.as_ptr();
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#[allow(clippy::cast_ptr_alignment)]
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let p32 = p as *const i32;
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let s = unsafe { std::slice::from_raw_parts(p32, bytes.len() / 4) };
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if s.len() != 3 {
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return None;
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}
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let ptr = s.as_ptr();
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let ints = unsafe { std::slice::from_raw_parts(ptr, 3) };
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Some(Record {
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promise_id: ints[0],
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arg: ints[1],
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result: ints[2],
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})
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}
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#[test]
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fn test_parse_min_record() {
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let buf = vec![1, 0, 0, 0, 3, 0, 0, 0, 4, 0, 0, 0];
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assert_eq!(
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parse_min_record(&buf),
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Some(Record {
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promise_id: 1,
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arg: 3,
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result: 4,
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})
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);
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let buf = vec![];
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assert_eq!(parse_min_record(&buf), None);
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let buf = vec![5];
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assert_eq!(parse_min_record(&buf), None);
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}
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pub fn minimal_op<D>(d: D) -> impl Fn(&[u8], Option<ZeroCopyBuf>) -> Op
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where
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D: Fn(bool, i32, Option<ZeroCopyBuf>) -> MinimalOp,
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{
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move |control: &[u8], zero_copy: Option<ZeroCopyBuf>| {
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let mut record = match parse_min_record(control) {
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Some(r) => r,
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None => {
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let e = OpError::type_error("Unparsable control buffer".to_string());
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let error_record = ErrorRecord {
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promise_id: 0,
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arg: -1,
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error_code: e.kind as i32,
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error_message: e.msg.as_bytes().to_owned(),
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};
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return Op::Sync(error_record.into());
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}
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};
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let is_sync = record.promise_id == 0;
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let rid = record.arg;
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let min_op = d(is_sync, rid, zero_copy);
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match min_op {
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MinimalOp::Sync(sync_result) => Op::Sync(match sync_result {
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Ok(r) => {
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record.result = r;
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record.into()
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}
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Err(err) => {
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let error_record = ErrorRecord {
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promise_id: record.promise_id,
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arg: -1,
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error_code: err.kind as i32,
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error_message: err.msg.as_bytes().to_owned(),
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};
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error_record.into()
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}
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}),
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MinimalOp::Async(min_fut) => {
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let fut = async move {
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match min_fut.await {
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Ok(r) => {
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record.result = r;
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record.into()
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}
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Err(err) => {
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let error_record = ErrorRecord {
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promise_id: record.promise_id,
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arg: -1,
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error_code: err.kind as i32,
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error_message: err.msg.as_bytes().to_owned(),
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};
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error_record.into()
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}
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}
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};
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Op::Async(fut.boxed_local())
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}
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}
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}
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}
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