refactor: use OpError instead of ErrBox for errors in ops (#4058)

To better reflect changes in error types in JS from #3662 this PR changes 
default error type used in ops from "ErrBox" to "OpError".

"OpError" is a type that can be sent over to JSON; it has all 
information needed to construct error in JavaScript. That
made "GetErrorKind" trait useless and so it was removed altogether.

To provide compatibility with previous use of "ErrBox" an implementation of
"From<ErrBox> for OpError" was added, however, it is an escape hatch and
ops implementors should strive to use "OpError" directly.

1 files changed, 8 insertions, 7 deletions

diff --git a/cli/ops/web_worker.rs b/cli/ops/web_worker.rs
index e22c0f221..db3ecd6ce 100644
--- a/cli/ops/web_worker.rs
+++ b/cli/ops/web_worker.rs
@@ -1,5 +1,6 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 use super::dispatch_json::{JsonOp, Value};
+use crate::op_error::OpError;
 use crate::ops::json_op;
 use crate::state::State;
 use crate::worker::WorkerEvent;
@@ -13,17 +14,17 @@ use std::convert::From;
 pub fn web_worker_op<D>(
   sender: mpsc::Sender<WorkerEvent>,
   dispatcher: D,
-) -> impl Fn(Value, Option<ZeroCopyBuf>) -> Result<JsonOp, ErrBox>
+) -> impl Fn(Value, Option<ZeroCopyBuf>) -> Result<JsonOp, OpError>
 where
   D: Fn(
     &mpsc::Sender<WorkerEvent>,
     Value,
     Option<ZeroCopyBuf>,
-  ) -> Result<JsonOp, ErrBox>,
+  ) -> Result<JsonOp, OpError>,
 {
-  move |args: Value, zero_copy: Option<ZeroCopyBuf>| -> Result<JsonOp, ErrBox> {
-    dispatcher(&sender, args, zero_copy)
-  }
+  move |args: Value,
+        zero_copy: Option<ZeroCopyBuf>|
+        -> Result<JsonOp, OpError> { dispatcher(&sender, args, zero_copy) }
 }
 
 pub fn init(i: &mut Isolate, s: &State, sender: &mpsc::Sender<WorkerEvent>) {
@@ -45,7 +46,7 @@ fn op_worker_post_message(
   sender: &mpsc::Sender<WorkerEvent>,
   _args: Value,
   data: Option<ZeroCopyBuf>,
-) -> Result<JsonOp, ErrBox> {
+) -> Result<JsonOp, OpError> {
   let d = Vec::from(data.unwrap().as_ref()).into_boxed_slice();
   let mut sender = sender.clone();
   let fut = sender.send(WorkerEvent::Message(d));
@@ -58,7 +59,7 @@ fn op_worker_close(
   sender: &mpsc::Sender<WorkerEvent>,
   _args: Value,
   _data: Option<ZeroCopyBuf>,
-) -> Result<JsonOp, ErrBox> {
+) -> Result<JsonOp, OpError> {
   let mut sender = sender.clone();
   sender.close_channel();
   Ok(JsonOp::Sync(json!({})))