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* Add WasmError Enables idiomatic Javascript error handling with js_sys::Error which includes error enum variant names. * Add WasmError test
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| // Copyright 2020-2021 IOTA Stiftung | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
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| use std::borrow::Cow; | ||
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| use wasm_bindgen::JsValue; | ||
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| /// Convert an error into an idiomatic [js_sys::Error]. | ||
| pub fn wasm_error<'a, T>(error: T) -> JsValue | ||
| where | ||
| T: Into<WasmError<'a>>, | ||
| { | ||
| let wasm_err: WasmError = error.into(); | ||
| JsValue::from(wasm_err) | ||
| } | ||
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| /// Convenience struct to convert internal errors to [js_sys::Error]. Uses [std::borrow::Cow] | ||
| /// internally to avoid unnecessary clones. | ||
| /// | ||
| /// This is a workaround for orphan rules so we can implement [core::convert::From] on errors from | ||
| /// dependencies. | ||
| #[derive(Debug, Clone)] | ||
| pub struct WasmError<'a> { | ||
| pub name: Cow<'a, str>, | ||
| pub message: Cow<'a, str>, | ||
| } | ||
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| impl<'a> WasmError<'a> { | ||
| pub fn new(name: Cow<'a, str>, message: Cow<'a, str>) -> Self { | ||
| Self { name, message } | ||
| } | ||
| } | ||
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| /// Convert [WasmError] into [js_sys::Error] for idiomatic error handling. | ||
| impl From<WasmError<'_>> for js_sys::Error { | ||
| fn from(error: WasmError<'_>) -> Self { | ||
| let js_error = js_sys::Error::new(&error.message); | ||
| js_error.set_name(&error.name); | ||
| js_error | ||
| } | ||
| } | ||
|
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| /// Convert [WasmError] into [wasm_bindgen::JsValue]. | ||
| impl From<WasmError<'_>> for JsValue { | ||
| fn from(error: WasmError<'_>) -> Self { | ||
| JsValue::from(js_sys::Error::from(error)) | ||
| } | ||
| } | ||
|
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| /// Implement WasmError for each type individually rather than a trait due to Rust's orphan rules. | ||
| /// Each type must implement `Into<&'static str> + Display`. The `Into<&'static str>` trait can be | ||
| /// derived using `strum::IntoStaticStr`. | ||
| #[macro_export] | ||
| macro_rules! impl_wasm_error_from { | ||
| ( $($t:ty),* ) => { | ||
| $(impl From<$t> for WasmError<'_> { | ||
| fn from(error: $t) -> Self { | ||
| Self { | ||
| message: Cow::Owned(error.to_string()), | ||
| name: Cow::Borrowed(error.into()), | ||
| } | ||
| } | ||
| })* | ||
| } | ||
| } | ||
|
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| impl_wasm_error_from!( | ||
| identity::comm::Error, | ||
| identity::core::Error, | ||
| identity::credential::Error, | ||
| identity::did::Error, | ||
| identity::iota::Error | ||
| ); | ||
|
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| impl From<serde_json::Error> for WasmError<'_> { | ||
| fn from(error: serde_json::Error) -> Self { | ||
| Self { | ||
| name: Cow::Borrowed("serde_json::Error"), // the exact error code is embedded in the message | ||
| message: Cow::Owned(error.to_string()), | ||
| } | ||
| } | ||
| } | ||
|
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| impl From<identity::iota::BeeMessageError> for WasmError<'_> { | ||
| fn from(error: identity::iota::BeeMessageError) -> Self { | ||
| Self { | ||
| name: Cow::Borrowed("bee_message::Error"), | ||
| message: Cow::Owned(error.to_string()), | ||
| } | ||
| } | ||
| } |
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