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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use deno_core::Buf;
use deno_core::CoreIsolateState;
use deno_core::ErrBox;
use deno_core::Op;
use deno_core::ZeroCopyBuf;
use futures::future::FutureExt;
pub use serde_derive::Deserialize;
use serde_json::json;
pub use serde_json::Value;
use std::future::Future;
use std::pin::Pin;
pub type JsonResult = Result<Value, ErrBox>;
pub type AsyncJsonOp = Pin<Box<dyn Future<Output = JsonResult>>>;
pub enum JsonOp {
Sync(Value),
Async(AsyncJsonOp),
/// AsyncUnref is the variation of Async, which doesn't block the program
/// exiting.
AsyncUnref(AsyncJsonOp),
}
pub fn serialize_result(
promise_id: Option<u64>,
result: JsonResult,
get_error_class_fn: deno_core::GetErrorClassFn,
) -> Buf {
let value = match result {
Ok(v) => json!({ "ok": v, "promiseId": promise_id }),
Err(err) => json!({
"err": {
"className": (get_error_class_fn)(&err),
"message": err.to_string()
},
"promiseId": promise_id
}),
};
serde_json::to_vec(&value).unwrap().into_boxed_slice()
}
#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct AsyncArgs {
promise_id: Option<u64>,
}
pub fn json_op<D>(
d: D,
) -> impl Fn(&mut CoreIsolateState, &mut [ZeroCopyBuf]) -> Op
where
D: Fn(
&mut CoreIsolateState,
Value,
&mut [ZeroCopyBuf],
) -> Result<JsonOp, ErrBox>,
{
move |isolate_state: &mut CoreIsolateState, zero_copy: &mut [ZeroCopyBuf]| {
let get_error_class_fn = isolate_state.get_error_class_fn;
assert!(!zero_copy.is_empty(), "Expected JSON string at position 0");
let async_args: AsyncArgs = match serde_json::from_slice(&zero_copy[0]) {
Ok(args) => args,
Err(e) => {
let buf = serialize_result(None, Err(e.into()), get_error_class_fn);
return Op::Sync(buf);
}
};
let promise_id = async_args.promise_id;
let is_sync = promise_id.is_none();
let result = serde_json::from_slice(&zero_copy[0])
.map_err(ErrBox::from)
.and_then(|args| d(isolate_state, args, &mut zero_copy[1..]));
// Convert to Op
match result {
Ok(JsonOp::Sync(sync_value)) => {
assert!(promise_id.is_none());
Op::Sync(serialize_result(
promise_id,
Ok(sync_value),
get_error_class_fn,
))
}
Ok(JsonOp::Async(fut)) => {
assert!(promise_id.is_some());
let fut2 = fut.then(move |result| {
futures::future::ready(serialize_result(
promise_id,
result,
get_error_class_fn,
))
});
Op::Async(fut2.boxed_local())
}
Ok(JsonOp::AsyncUnref(fut)) => {
assert!(promise_id.is_some());
let fut2 = fut.then(move |result| {
futures::future::ready(serialize_result(
promise_id,
result,
get_error_class_fn,
))
});
Op::AsyncUnref(fut2.boxed_local())
}
Err(sync_err) => {
let buf =
serialize_result(promise_id, Err(sync_err), get_error_class_fn);
if is_sync {
Op::Sync(buf)
} else {
Op::Async(futures::future::ready(buf).boxed_local())
}
}
}
}
}
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