mirror of
https://github.com/denoland/deno.git
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bc467b265f
Converts env(), exit(), execPath(), utime() and utimeSync() to use JSON instead of flatbuffers.
113 lines
3 KiB
Rust
113 lines
3 KiB
Rust
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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use crate::state::ThreadSafeState;
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use crate::tokio_util;
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use deno::*;
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use futures::Future;
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use futures::Poll;
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pub use serde_derive::Deserialize;
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use serde_json::json;
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pub use serde_json::Value;
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pub type AsyncJsonOp = Box<dyn Future<Item = Value, Error = ErrBox> + Send>;
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pub enum JsonOp {
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Sync(Value),
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Async(AsyncJsonOp),
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}
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fn json_err(err: ErrBox) -> Value {
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use crate::deno_error::GetErrorKind;
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json!({
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"message": err.to_string(),
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"kind": err.kind() as u32,
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})
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}
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pub type Dispatcher = fn(
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state: &ThreadSafeState,
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args: Value,
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zero_copy: Option<PinnedBuf>,
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) -> Result<JsonOp, ErrBox>;
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fn serialize_result(
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promise_id: Option<u64>,
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result: Result<Value, ErrBox>,
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) -> Buf {
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let value = match result {
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Ok(v) => json!({ "ok": v, "promiseId": promise_id }),
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Err(err) => json!({ "err": json_err(err), "promiseId": promise_id }),
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};
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let vec = serde_json::to_vec(&value).unwrap();
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vec.into_boxed_slice()
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}
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#[derive(Deserialize)]
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#[serde(rename_all = "camelCase")]
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struct AsyncArgs {
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promise_id: Option<u64>,
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}
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pub fn dispatch(
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d: Dispatcher,
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state: &ThreadSafeState,
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control: &[u8],
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zero_copy: Option<PinnedBuf>,
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) -> CoreOp {
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let async_args: AsyncArgs = serde_json::from_slice(control).unwrap();
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let promise_id = async_args.promise_id;
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let is_sync = promise_id.is_none();
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let result = serde_json::from_slice(control)
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.map_err(ErrBox::from)
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.and_then(move |args| d(state, args, zero_copy));
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match result {
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Ok(JsonOp::Sync(sync_value)) => {
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assert!(promise_id.is_none());
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CoreOp::Sync(serialize_result(promise_id, Ok(sync_value)))
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}
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Ok(JsonOp::Async(fut)) => {
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assert!(promise_id.is_some());
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let fut2 = Box::new(fut.then(move |result| -> Result<Buf, ()> {
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Ok(serialize_result(promise_id, result))
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}));
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CoreOp::Async(fut2)
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}
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Err(sync_err) => {
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let buf = serialize_result(promise_id, Err(sync_err));
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if is_sync {
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CoreOp::Sync(buf)
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} else {
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CoreOp::Async(Box::new(futures::future::ok(buf)))
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}
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}
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}
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}
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// This is just type conversion. Implement From trait?
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// See https://github.com/tokio-rs/tokio/blob/ffd73a64e7ec497622b7f939e38017afe7124dc4/tokio-fs/src/lib.rs#L76-L85
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fn convert_blocking_json<F>(f: F) -> Poll<Value, ErrBox>
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where
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F: FnOnce() -> Result<Value, ErrBox>,
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{
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use futures::Async::*;
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match tokio_threadpool::blocking(f) {
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Ok(Ready(Ok(v))) => Ok(Ready(v)),
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Ok(Ready(Err(err))) => Err(err),
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Ok(NotReady) => Ok(NotReady),
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Err(err) => panic!("blocking error {}", err),
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}
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}
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pub fn blocking_json<F>(is_sync: bool, f: F) -> Result<JsonOp, ErrBox>
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where
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F: 'static + Send + FnOnce() -> Result<Value, ErrBox>,
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{
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if is_sync {
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Ok(JsonOp::Sync(f()?))
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} else {
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Ok(JsonOp::Async(Box::new(futures::sync::oneshot::spawn(
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tokio_util::poll_fn(move || convert_blocking_json(f)),
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&tokio_executor::DefaultExecutor::current(),
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))))
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}
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}
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