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-rw-r--r--core/errors.rs466
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diff --git a/core/errors.rs b/core/errors.rs
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--- a/core/errors.rs
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-// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-
-use rusty_v8 as v8;
-use std::any::Any;
-use std::any::TypeId;
-use std::borrow::Cow;
-use std::convert::TryFrom;
-use std::convert::TryInto;
-use std::error::Error;
-use std::fmt;
-use std::io;
-
-// The Send and Sync traits are required because deno is multithreaded and we
-// need to be able to handle errors across threads.
-pub trait AnyError: Any + Error + Send + Sync + 'static {}
-impl<T> AnyError for T where T: Any + Error + Send + Sync + Sized + 'static {}
-
-#[derive(Debug)]
-pub enum ErrBox {
- Simple {
- class: &'static str,
- message: Cow<'static, str>,
- },
- Boxed(Box<dyn AnyError>),
-}
-
-impl ErrBox {
- pub fn new(
- class: &'static str,
- message: impl Into<Cow<'static, str>>,
- ) -> Self {
- Self::Simple {
- class,
- message: message.into(),
- }
- }
-
- pub fn bad_resource(message: impl Into<Cow<'static, str>>) -> Self {
- Self::new("BadResource", message)
- }
-
- pub fn bad_resource_id() -> Self {
- Self::new("BadResource", "Bad resource ID")
- }
-
- pub fn error(message: impl Into<Cow<'static, str>>) -> Self {
- Self::new("Error", message)
- }
-
- pub fn not_supported() -> Self {
- Self::new("NotSupported", "The operation is supported")
- }
-
- pub fn resource_unavailable() -> Self {
- Self::new(
- "Busy",
- "Resource is unavailable because it is in use by a promise",
- )
- }
-
- pub fn type_error(message: impl Into<Cow<'static, str>>) -> Self {
- Self::new("TypeError", message)
- }
-
- pub fn last_os_error() -> Self {
- Self::from(io::Error::last_os_error())
- }
-
- pub fn downcast<T: AnyError>(self) -> Result<T, Self> {
- match self {
- Self::Boxed(error) if Any::type_id(&*error) == TypeId::of::<T>() => {
- let error = Box::into_raw(error) as *mut T;
- let error = unsafe { Box::from_raw(error) };
- Ok(*error)
- }
- other => Err(other),
- }
- }
-
- pub fn downcast_ref<T: AnyError>(&self) -> Option<&T> {
- match self {
- Self::Boxed(error) if Any::type_id(&**error) == TypeId::of::<T>() => {
- let error = &**error as *const dyn AnyError as *const T;
- let error = unsafe { &*error };
- Some(error)
- }
- _ => None,
- }
- }
-}
-
-impl fmt::Display for ErrBox {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- match self {
- Self::Simple { message, .. } => f.write_str(message),
- Self::Boxed(error) => error.fmt(f),
- }
- }
-}
-
-impl<T: AnyError> From<T> for ErrBox {
- fn from(error: T) -> Self {
- Self::Boxed(Box::new(error))
- }
-}
-
-impl From<Box<dyn AnyError>> for ErrBox {
- fn from(boxed: Box<dyn AnyError>) -> Self {
- Self::Boxed(boxed)
- }
-}
-
-/// A `JsError` represents an exception coming from V8, with stack frames and
-/// line numbers. The deno_cli crate defines another `JsError` type, which wraps
-/// the one defined here, that adds source map support and colorful formatting.
-#[derive(Debug, PartialEq, Clone)]
-pub struct JsError {
- pub message: String,
- pub source_line: Option<String>,
- pub script_resource_name: Option<String>,
- pub line_number: Option<i64>,
- pub start_column: Option<i64>, // 0-based
- pub end_column: Option<i64>, // 0-based
- pub frames: Vec<JsStackFrame>,
- pub formatted_frames: Vec<String>,
-}
-
-#[derive(Debug, PartialEq, Clone)]
-pub struct JsStackFrame {
- pub type_name: Option<String>,
- pub function_name: Option<String>,
- pub method_name: Option<String>,
- pub file_name: Option<String>,
- pub line_number: Option<i64>,
- pub column_number: Option<i64>,
- pub eval_origin: Option<String>,
- pub is_top_level: Option<bool>,
- pub is_eval: bool,
- pub is_native: bool,
- pub is_constructor: bool,
- pub is_async: bool,
- pub is_promise_all: bool,
- pub promise_index: Option<i64>,
-}
-
-fn get_property<'a>(
- scope: &mut v8::HandleScope<'a>,
- object: v8::Local<v8::Object>,
- key: &str,
-) -> Option<v8::Local<'a, v8::Value>> {
- let key = v8::String::new(scope, key).unwrap();
- object.get(scope, key.into())
-}
-
-impl JsError {
- pub(crate) fn create(js_error: Self) -> ErrBox {
- js_error.into()
- }
-
- pub fn from_v8_exception(
- scope: &mut v8::HandleScope,
- exception: v8::Local<v8::Value>,
- ) -> Self {
- // Create a new HandleScope because we're creating a lot of new local
- // handles below.
- let scope = &mut v8::HandleScope::new(scope);
-
- let msg = v8::Exception::create_message(scope, exception);
-
- let (message, frames, formatted_frames) = if exception.is_native_error() {
- // The exception is a JS Error object.
- let exception: v8::Local<v8::Object> =
- exception.clone().try_into().unwrap();
-
- // Get the message by formatting error.name and error.message.
- let name = get_property(scope, exception, "name")
- .and_then(|m| m.to_string(scope))
- .map(|s| s.to_rust_string_lossy(scope))
- .unwrap_or_else(|| "undefined".to_string());
- let message_prop = get_property(scope, exception, "message")
- .and_then(|m| m.to_string(scope))
- .map(|s| s.to_rust_string_lossy(scope))
- .unwrap_or_else(|| "undefined".to_string());
- let message = format!("Uncaught {}: {}", name, message_prop);
-
- // Access error.stack to ensure that prepareStackTrace() has been called.
- // This should populate error.__callSiteEvals and error.__formattedFrames.
- let _ = get_property(scope, exception, "stack");
-
- // Read an array of structured frames from error.__callSiteEvals.
- let frames_v8 = get_property(scope, exception, "__callSiteEvals");
- let frames_v8: Option<v8::Local<v8::Array>> =
- frames_v8.and_then(|a| a.try_into().ok());
-
- // Read an array of pre-formatted frames from error.__formattedFrames.
- let formatted_frames_v8 =
- get_property(scope, exception, "__formattedFrames");
- let formatted_frames_v8: Option<v8::Local<v8::Array>> =
- formatted_frames_v8.and_then(|a| a.try_into().ok());
-
- // Convert them into Vec<JSStack> and Vec<String> respectively.
- let mut frames: Vec<JsStackFrame> = vec![];
- let mut formatted_frames: Vec<String> = vec![];
- if let (Some(frames_v8), Some(formatted_frames_v8)) =
- (frames_v8, formatted_frames_v8)
- {
- for i in 0..frames_v8.length() {
- let call_site: v8::Local<v8::Object> =
- frames_v8.get_index(scope, i).unwrap().try_into().unwrap();
- let type_name: Option<v8::Local<v8::String>> =
- get_property(scope, call_site, "typeName")
- .unwrap()
- .try_into()
- .ok();
- let type_name = type_name.map(|s| s.to_rust_string_lossy(scope));
- let function_name: Option<v8::Local<v8::String>> =
- get_property(scope, call_site, "functionName")
- .unwrap()
- .try_into()
- .ok();
- let function_name =
- function_name.map(|s| s.to_rust_string_lossy(scope));
- let method_name: Option<v8::Local<v8::String>> =
- get_property(scope, call_site, "methodName")
- .unwrap()
- .try_into()
- .ok();
- let method_name = method_name.map(|s| s.to_rust_string_lossy(scope));
- let file_name: Option<v8::Local<v8::String>> =
- get_property(scope, call_site, "fileName")
- .unwrap()
- .try_into()
- .ok();
- let file_name = file_name.map(|s| s.to_rust_string_lossy(scope));
- let line_number: Option<v8::Local<v8::Integer>> =
- get_property(scope, call_site, "lineNumber")
- .unwrap()
- .try_into()
- .ok();
- let line_number = line_number.map(|n| n.value());
- let column_number: Option<v8::Local<v8::Integer>> =
- get_property(scope, call_site, "columnNumber")
- .unwrap()
- .try_into()
- .ok();
- let column_number = column_number.map(|n| n.value());
- let eval_origin: Option<v8::Local<v8::String>> =
- get_property(scope, call_site, "evalOrigin")
- .unwrap()
- .try_into()
- .ok();
- let eval_origin = eval_origin.map(|s| s.to_rust_string_lossy(scope));
- let is_top_level: Option<v8::Local<v8::Boolean>> =
- get_property(scope, call_site, "isTopLevel")
- .unwrap()
- .try_into()
- .ok();
- let is_top_level = is_top_level.map(|b| b.is_true());
- let is_eval: v8::Local<v8::Boolean> =
- get_property(scope, call_site, "isEval")
- .unwrap()
- .try_into()
- .unwrap();
- let is_eval = is_eval.is_true();
- let is_native: v8::Local<v8::Boolean> =
- get_property(scope, call_site, "isNative")
- .unwrap()
- .try_into()
- .unwrap();
- let is_native = is_native.is_true();
- let is_constructor: v8::Local<v8::Boolean> =
- get_property(scope, call_site, "isConstructor")
- .unwrap()
- .try_into()
- .unwrap();
- let is_constructor = is_constructor.is_true();
- let is_async: v8::Local<v8::Boolean> =
- get_property(scope, call_site, "isAsync")
- .unwrap()
- .try_into()
- .unwrap();
- let is_async = is_async.is_true();
- let is_promise_all: v8::Local<v8::Boolean> =
- get_property(scope, call_site, "isPromiseAll")
- .unwrap()
- .try_into()
- .unwrap();
- let is_promise_all = is_promise_all.is_true();
- let promise_index: Option<v8::Local<v8::Integer>> =
- get_property(scope, call_site, "columnNumber")
- .unwrap()
- .try_into()
- .ok();
- let promise_index = promise_index.map(|n| n.value());
- frames.push(JsStackFrame {
- type_name,
- function_name,
- method_name,
- file_name,
- line_number,
- column_number,
- eval_origin,
- is_top_level,
- is_eval,
- is_native,
- is_constructor,
- is_async,
- is_promise_all,
- promise_index,
- });
- let formatted_frame: v8::Local<v8::String> = formatted_frames_v8
- .get_index(scope, i)
- .unwrap()
- .try_into()
- .unwrap();
- let formatted_frame = formatted_frame.to_rust_string_lossy(scope);
- formatted_frames.push(formatted_frame)
- }
- }
- (message, frames, formatted_frames)
- } else {
- // The exception is not a JS Error object.
- // Get the message given by V8::Exception::create_message(), and provide
- // empty frames.
- (msg.get(scope).to_rust_string_lossy(scope), vec![], vec![])
- };
-
- Self {
- message,
- script_resource_name: msg
- .get_script_resource_name(scope)
- .and_then(|v| v8::Local::<v8::String>::try_from(v).ok())
- .map(|v| v.to_rust_string_lossy(scope)),
- source_line: msg
- .get_source_line(scope)
- .map(|v| v.to_rust_string_lossy(scope)),
- line_number: msg.get_line_number(scope).and_then(|v| v.try_into().ok()),
- start_column: msg.get_start_column().try_into().ok(),
- end_column: msg.get_end_column().try_into().ok(),
- frames,
- formatted_frames,
- }
- }
-}
-
-impl Error for JsError {}
-
-fn format_source_loc(
- file_name: &str,
- line_number: i64,
- column_number: i64,
-) -> String {
- let line_number = line_number;
- let column_number = column_number;
- format!("{}:{}:{}", file_name, line_number, column_number)
-}
-
-impl fmt::Display for JsError {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- if let Some(script_resource_name) = &self.script_resource_name {
- if self.line_number.is_some() && self.start_column.is_some() {
- assert!(self.line_number.is_some());
- assert!(self.start_column.is_some());
- let source_loc = format_source_loc(
- script_resource_name,
- self.line_number.unwrap(),
- self.start_column.unwrap(),
- );
- write!(f, "{}", source_loc)?;
- }
- if self.source_line.is_some() {
- let source_line = self.source_line.as_ref().unwrap();
- write!(f, "\n{}\n", source_line)?;
- let mut s = String::new();
- for i in 0..self.end_column.unwrap() {
- if i >= self.start_column.unwrap() {
- s.push('^');
- } else if source_line.chars().nth(i as usize).unwrap() == '\t' {
- s.push('\t');
- } else {
- s.push(' ');
- }
- }
- writeln!(f, "{}", s)?;
- }
- }
-
- write!(f, "{}", self.message)?;
-
- for formatted_frame in &self.formatted_frames {
- // TODO: Strip ANSI color from formatted_frame.
- write!(f, "\n at {}", formatted_frame)?;
- }
- Ok(())
- }
-}
-
-pub(crate) fn attach_handle_to_error(
- scope: &mut v8::Isolate,
- err: ErrBox,
- handle: v8::Local<v8::Value>,
-) -> ErrBox {
- // TODO(bartomieju): this is a special case...
- ErrWithV8Handle::new(scope, err, handle).into()
-}
-
-// TODO(piscisaureus): rusty_v8 should implement the Error trait on
-// values of type v8::Global<T>.
-pub struct ErrWithV8Handle {
- err: ErrBox,
- handle: v8::Global<v8::Value>,
-}
-
-impl ErrWithV8Handle {
- pub fn new(
- scope: &mut v8::Isolate,
- err: ErrBox,
- handle: v8::Local<v8::Value>,
- ) -> Self {
- let handle = v8::Global::new(scope, handle);
- Self { err, handle }
- }
-
- pub fn get_handle<'s>(
- &self,
- scope: &mut v8::HandleScope<'s>,
- ) -> v8::Local<'s, v8::Value> {
- v8::Local::new(scope, &self.handle)
- }
-}
-
-unsafe impl Send for ErrWithV8Handle {}
-unsafe impl Sync for ErrWithV8Handle {}
-
-impl Error for ErrWithV8Handle {}
-
-impl fmt::Display for ErrWithV8Handle {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- self.err.fmt(f)
- }
-}
-
-impl fmt::Debug for ErrWithV8Handle {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- self.err.fmt(f)
- }
-}
-
-#[cfg(test)]
-mod tests {
- use super::*;
-
- #[test]
- fn test_bad_resource() {
- let err = ErrBox::bad_resource("Resource has been closed");
- assert!(matches!(err, ErrBox::Simple { class: "BadResource", .. }));
- assert_eq!(err.to_string(), "Resource has been closed");
- }
-
- #[test]
- fn test_bad_resource_id() {
- let err = ErrBox::bad_resource_id();
- assert!(matches!(err, ErrBox::Simple { class: "BadResource", .. }));
- assert_eq!(err.to_string(), "Bad resource ID");
- }
-}
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