Beautiful errors for Rust

src/build/stable/commands/compile/candid_and_method_meta/execute.ts

@@ -30,6 +30,7 @@ export async function execute(
                     len
                 );
                 const message = new TextDecoder('utf8').decode(memory);
+
                 console.info(message);
             },
             global_timer_set: (): void => {},
@@ -63,7 +64,18 @@ export async function execute(
             stable64_size: (): void => {},
             stable64_write: (): void => {},
             time: (): bigint => 0n,
-            trap: (): void => {}
+            trap: (ptr: number, len: number): void => {
+                const memory = new Uint8Array(
+                    (wasmInstance.exports.memory as any).buffer,
+                    ptr,
+                    len
+                );
+                const message = new TextDecoder('utf8').decode(memory);
+
+                console.error(message);
+
+                process.exit(1);
+            }
         }
         // env: {
         //     azle_log(ptr: number, len: number) {

src/build/stable/commands/compile/wasm_binary/rust/stable_canister_template/src/benchmarking.rs

@@ -19,10 +19,15 @@ pub fn record_benchmark(function_name: &str, instructions: u64) -> Result<(), Bo
     quickjs_with_ctx(|ctx| {
         let timestamp = ic_cdk::api::time();
 
-        let method_names: rquickjs::Object =
-            ctx.clone().globals().get("_azleCanisterMethodNames")?;
-
-        let method_name: String = method_names.get(function_name)?;
+        let method_names: rquickjs::Object = ctx
+            .clone()
+            .globals()
+            .get("_azleCanisterMethodNames")
+            .map_err(|e| format!("Failed to get globalThis._azleCanisterMethodNames: {e}"))?;
+
+        let method_name: String = method_names.get(function_name).map_err(|e| {
+            format!("Failed to get globalThis._azleCanisterMethodNames[{function_name}]: {e}")
+        })?;
 
         BENCHMARKS_REF_CELL.with(|benchmarks_ref_cell| {
             let mut benchmarks = benchmarks_ref_cell.borrow_mut();

src/build/stable/commands/compile/wasm_binary/rust/stable_canister_template/src/candid.rs

@@ -1,66 +1,69 @@
+use std::error::Error;
+
 use crate::{
-    ic, quickjs_with_ctx, wasm_binary_manipulation::get_js_code, CONTEXT_REF_CELL, MODULE_NAME,
+    error::{handle_promise_error, quickjs_call_with_error_handling},
+    ic, quickjs_with_ctx,
+    wasm_binary_manipulation::get_js_code,
+    CONTEXT_REF_CELL, MODULE_NAME,
 };
 
-// TODO we might not need any of these panic hooks
+type CCharPtr = *mut std::os::raw::c_char;
 
-// Heavily inspired by https://stackoverflow.com/a/47676844
 #[no_mangle]
-pub fn get_candid_and_method_meta_pointer() -> *mut std::os::raw::c_char {
-    std::panic::set_hook(Box::new(|panic_info| {
-        let msg = match panic_info.payload().downcast_ref::<&str>() {
-            Some(s) => *s,
-            None => "Unknown panic message",
-        };
-        let location = if let Some(location) = panic_info.location() {
-            format!(" at {}:{}", location.file(), location.line())
-        } else {
-            " (unknown location)".to_string()
-        };
-
-        let message = &format!("Panic occurred: {}{}", msg, location);
-
-        ic_cdk::println!("{}", message);
-    }));
-
-    let runtime = rquickjs::Runtime::new().unwrap();
-    let context = rquickjs::Context::full(&runtime).unwrap();
+pub fn get_candid_and_method_meta_pointer() -> CCharPtr {
+    match initialize_and_get_candid() {
+        Ok(c_char_ptr) => c_char_ptr,
+        Err(error) => {
+            ic_cdk::trap(&format!("Azle CandidAndMethodMetaError: {error}"));
+        }
+    }
+}
+
+fn initialize_and_get_candid() -> Result<CCharPtr, Box<dyn Error>> {
+    let runtime = rquickjs::Runtime::new()?;
+    let context = rquickjs::Context::full(&runtime)?;
 
     CONTEXT_REF_CELL.with(|context_ref_cell| {
         *context_ref_cell.borrow_mut() = Some(context);
     });
 
-    quickjs_with_ctx(|ctx| {
+    quickjs_with_ctx(|ctx| -> Result<CCharPtr, Box<dyn Error>> {
         ctx.clone()
             .globals()
-            .set("_azleNodeWasmEnvironment", true)
-            .unwrap();
-
-        ic::register(ctx.clone());
+            .set("_azleNodeWasmEnvironment", true)?;
 
         ctx.clone()
             .globals()
-            .set("exports", rquickjs::Object::new(ctx.clone()).unwrap())
-            .unwrap();
+            .set("exports", rquickjs::Object::new(ctx.clone())?)?;
 
-        ctx.clone()
-            .globals()
-            .set("_azleExperimental", false)
-            .unwrap();
+        ctx.clone().globals().set("_azleExperimental", false)?;
+
+        ic::register(ctx.clone())?;
 
         let js = get_js_code();
 
-        // TODO is there a better name for this main module?
-        // TODO this returns a promise...make sure we handle it appropriately
-        rquickjs::Module::evaluate(ctx.clone(), MODULE_NAME, js).unwrap();
+        let promise =
+            rquickjs::Module::evaluate(ctx.clone(), MODULE_NAME, std::str::from_utf8(&js)?)?;
+
+        handle_promise_error(ctx.clone(), promise)?;
+
+        let get_candid_and_method_meta: rquickjs::Function = ctx
+            .clone()
+            .globals()
+            .get("_azleGetCandidAndMethodMeta")
+            .map_err(|e| format!("Failed to get globalThis._azleGetCandidAndMethodMeta: {e}"))?;
 
-        let get_candid_and_method_meta: rquickjs::Function =
-            ctx.globals().get("_azleGetCandidAndMethodMeta").unwrap();
+        let candid_and_method_meta_js_value =
+            quickjs_call_with_error_handling(ctx.clone(), get_candid_and_method_meta, ())?;
 
-        let candid_and_method_meta: String = get_candid_and_method_meta.call(()).unwrap();
+        let candid_and_method_meta: String = candid_and_method_meta_js_value
+            .as_string()
+            .ok_or("Failed to convert candidAndMethodMeta JS value to string")?
+            .to_string()?;
 
-        let c_string = std::ffi::CString::new(candid_and_method_meta).unwrap();
+        let c_string = std::ffi::CString::new(candid_and_method_meta)?;
+        let c_char_ptr = c_string.into_raw();
 
-        c_string.into_raw()
+        Ok(c_char_ptr)
     })
 }

src/build/stable/commands/compile/wasm_binary/rust/stable_canister_template/src/error.rs

@@ -0,0 +1,57 @@
+use std::error::Error;
+
+use rquickjs::function::IntoArgs;
+
+use crate::quickjs_with_ctx::run_event_loop;
+
+pub fn quickjs_call_with_error_handling<'a>(
+    ctx: rquickjs::Ctx<'a>,
+    function: rquickjs::Function<'a>,
+    args: impl IntoArgs<'a>,
+) -> Result<rquickjs::Value<'a>, Box<dyn std::error::Error>> {
+    let result: rquickjs::Value = match function.call(args) {
+        Ok(value) => value,
+        Err(_) => trap_on_last_exception(ctx.clone())?,
+    };
+
+    // TODO we run the event loop here and also in handle_promise_error, is that a problem?
+    run_event_loop(ctx.clone());
+
+    if result.is_promise() {
+        let promise: rquickjs::Promise = result
+            .clone()
+            .into_promise()
+            .ok_or("Failed to convert function call return JS value to promise")?;
+        handle_promise_error(ctx.clone(), promise)?;
+    }
+
+    Ok(result)
+}
+
+fn trap_on_last_exception<T>(ctx: rquickjs::Ctx) -> Result<T, Box<dyn std::error::Error>> {
+    let exception: rquickjs::Exception = ctx
+        .clone()
+        .catch()
+        .as_exception()
+        .ok_or("No exception found")?
+        .clone();
+
+    ic_cdk::trap(&exception.to_string());
+}
+
+pub fn handle_promise_error(
+    ctx: rquickjs::Ctx,
+    promise: rquickjs::Promise,
+) -> Result<(), Box<dyn Error>> {
+    run_event_loop(ctx.clone());
+
+    match promise.state() {
+        rquickjs::promise::PromiseState::Rejected => {
+            promise.result::<rquickjs::Value>();
+            trap_on_last_exception(ctx.clone())?;
+        }
+        _ => {}
+    };
+
+    Ok(())
+}

src/build/stable/commands/compile/wasm_binary/rust/stable_canister_template/src/execute_method_js.rs

@@ -1,35 +1,57 @@
-use crate::{benchmarking::record_benchmark, quickjs_with_ctx, WASM_DATA_REF_CELL};
+use crate::{
+    benchmarking::record_benchmark, error::quickjs_call_with_error_handling, quickjs_with_ctx,
+    WASM_DATA_REF_CELL,
+};
 
 #[no_mangle]
 #[allow(unused)]
-pub extern "C" fn execute_method_js(function_index: i32, pass_arg_data: i32) {
-    let function_name = &function_index.to_string();
-    let pass_arg_data = if pass_arg_data == 1 { true } else { false };
+pub extern "C" fn execute_method_js(function_index: i32, pass_arg_data_raw: i32) {
+    let function_name = function_index.to_string();
+    let pass_arg_data = pass_arg_data_raw == 1;
 
+    let result = execute_method_js_with_result(function_name, pass_arg_data);
+
+    if let Err(e) = result {
+        ic_cdk::trap(&format!("Azle CanisterMethodError: {}", e));
+    }
+}
+
+fn execute_method_js_with_result(
+    function_name: String,
+    pass_arg_data: bool,
+) -> Result<(), Box<dyn std::error::Error>> {
     quickjs_with_ctx(|ctx| {
-        let callbacks: rquickjs::Object = ctx.clone().globals().get("_azleCallbacks").unwrap();
+        let callbacks: rquickjs::Object = ctx
+            .clone()
+            .globals()
+            .get("_azleCallbacks")
+            .map_err(|e| format!("Failed to get globalThis._azleCallbacks: {e}"))?;
 
-        let method_callback: rquickjs::Function = callbacks.get(function_name).unwrap();
+        let method_callback: rquickjs::Function = callbacks.get(&function_name).map_err(|e| {
+            format!("Failed to get globalThis._azleCallbacks[{function_name}]: {e}")
+        })?;
 
         let candid_args = if pass_arg_data {
             ic_cdk::api::call::arg_data_raw()
         } else {
             vec![]
         };
 
-        method_callback
-            .call::<_, rquickjs::Undefined>((candid_args,))
-            .unwrap();
-    });
-
-    if WASM_DATA_REF_CELL.with(|wasm_data_ref_cell| {
-        wasm_data_ref_cell
-            .borrow()
-            .as_ref()
-            .unwrap()
-            .record_benchmarks
-    }) {
+        quickjs_call_with_error_handling(ctx.clone(), method_callback, (candid_args,))?;
+
+        Ok(())
+    })?;
+
+    let record_benchmarks = WASM_DATA_REF_CELL
+        .with(|wasm_data_ref_cell| wasm_data_ref_cell.borrow().clone())
+        .as_ref()
+        .ok_or("could not convert wasm_data_ref_cell to ref")?
+        .record_benchmarks;
+
+    if record_benchmarks {
         let instructions = ic_cdk::api::performance_counter(1);
-        record_benchmark(&function_name, instructions);
+        record_benchmark(&function_name, instructions)?;
     }
+
+    Ok(())
 }

src/build/stable/commands/compile/wasm_binary/rust/stable_canister_template/src/ic/accept_message.rs

@@ -1,8 +1,6 @@
-use rquickjs::{Ctx, Function};
+use ic_cdk::api::call::accept_message;
+use rquickjs::{Ctx, Function, Result};
 
-pub fn get_function(context: Ctx) -> Function {
-    Function::new(context, || {
-        ic_cdk::api::call::accept_message();
-    })
-    .unwrap()
+pub fn get_function(ctx: Ctx) -> Result<Function> {
+    Function::new(ctx, || accept_message())
 }

src/build/stable/commands/compile/wasm_binary/rust/stable_canister_template/src/ic/arg_data_raw.rs

@@ -1,8 +1,6 @@
-use rquickjs::{Ctx, Function, TypedArray};
+use ic_cdk::api::call::arg_data_raw;
+use rquickjs::{Ctx, Function, Result};
 
-pub fn get_function(context: Ctx) -> Function {
-    Function::new(context.clone(), move || {
-        TypedArray::<u8>::new(context.clone(), ic_cdk::api::call::arg_data_raw())
-    })
-    .unwrap()
+pub fn get_function(ctx: Ctx) -> Result<Function> {
+    Function::new(ctx, || arg_data_raw())
 }