mirror of
https://github.com/denoland/deno.git
synced 2024-12-22 15:24:46 -05:00
671 lines
21 KiB
Rust
671 lines
21 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use std::borrow::Cow;
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use std::collections::HashSet;
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use std::fmt;
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use std::fmt::Debug;
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use std::fmt::Display;
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use std::fmt::Formatter;
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use anyhow::Error;
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use crate::runtime::GetErrorClassFn;
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use crate::runtime::JsRealm;
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use crate::runtime::JsRuntime;
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use crate::source_map::apply_source_map;
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use crate::source_map::get_source_line;
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use crate::url::Url;
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/// A generic wrapper that can encapsulate any concrete error type.
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// TODO(ry) Deprecate AnyError and encourage deno_core::anyhow::Error instead.
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pub type AnyError = anyhow::Error;
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/// Creates a new error with a caller-specified error class name and message.
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pub fn custom_error(
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class: &'static str,
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message: impl Into<Cow<'static, str>>,
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) -> Error {
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CustomError {
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class,
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message: message.into(),
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}
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.into()
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}
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pub fn generic_error(message: impl Into<Cow<'static, str>>) -> Error {
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custom_error("Error", message)
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}
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pub fn type_error(message: impl Into<Cow<'static, str>>) -> Error {
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custom_error("TypeError", message)
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}
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pub fn range_error(message: impl Into<Cow<'static, str>>) -> Error {
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custom_error("RangeError", message)
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}
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pub fn invalid_hostname(hostname: &str) -> Error {
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type_error(format!("Invalid hostname: '{hostname}'"))
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}
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pub fn uri_error(message: impl Into<Cow<'static, str>>) -> Error {
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custom_error("URIError", message)
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}
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pub fn bad_resource(message: impl Into<Cow<'static, str>>) -> Error {
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custom_error("BadResource", message)
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}
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pub fn bad_resource_id() -> Error {
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custom_error("BadResource", "Bad resource ID")
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}
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pub fn not_supported() -> Error {
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custom_error("NotSupported", "The operation is not supported")
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}
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pub fn resource_unavailable() -> Error {
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custom_error(
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"Busy",
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"Resource is unavailable because it is in use by a promise",
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)
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}
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/// A simple error type that lets the creator specify both the error message and
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/// the error class name. This type is private; externally it only ever appears
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/// wrapped in an `anyhow::Error`. To retrieve the error class name from a wrapped
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/// `CustomError`, use the function `get_custom_error_class()`.
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#[derive(Debug)]
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struct CustomError {
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class: &'static str,
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message: Cow<'static, str>,
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}
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impl Display for CustomError {
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
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f.write_str(&self.message)
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}
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}
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impl std::error::Error for CustomError {}
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/// If this error was crated with `custom_error()`, return the specified error
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/// class name. In all other cases this function returns `None`.
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pub fn get_custom_error_class(error: &Error) -> Option<&'static str> {
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error.downcast_ref::<CustomError>().map(|e| e.class)
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}
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pub fn to_v8_error<'a>(
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scope: &mut v8::HandleScope<'a>,
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get_class: GetErrorClassFn,
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error: &Error,
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) -> v8::Local<'a, v8::Value> {
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let tc_scope = &mut v8::TryCatch::new(scope);
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let cb = JsRealm::state_from_scope(tc_scope)
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.borrow()
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.js_build_custom_error_cb
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.clone()
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.expect("Custom error builder must be set");
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let cb = cb.open(tc_scope);
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let this = v8::undefined(tc_scope).into();
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let class = v8::String::new(tc_scope, get_class(error)).unwrap();
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let message = v8::String::new(tc_scope, &format!("{error:#}")).unwrap();
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let mut args = vec![class.into(), message.into()];
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if let Some(code) = crate::error_codes::get_error_code(error) {
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args.push(v8::String::new(tc_scope, code).unwrap().into());
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}
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let maybe_exception = cb.call(tc_scope, this, &args);
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match maybe_exception {
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Some(exception) => exception,
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None => {
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let mut msg =
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"Custom error class must have a builder registered".to_string();
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if tc_scope.has_caught() {
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let e = tc_scope.exception().unwrap();
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let js_error = JsError::from_v8_exception(tc_scope, e);
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msg = format!("{}: {}", msg, js_error.exception_message);
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}
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panic!("{}", msg);
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}
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}
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}
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/// A `JsError` represents an exception coming from V8, with stack frames and
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/// line numbers. The deno_cli crate defines another `JsError` type, which wraps
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/// the one defined here, that adds source map support and colorful formatting.
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/// When updating this struct, also update errors_are_equal_without_cause() in
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/// fmt_error.rs.
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#[derive(Debug, PartialEq, Clone, serde::Deserialize, serde::Serialize)]
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#[serde(rename_all = "camelCase")]
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pub struct JsError {
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pub name: Option<String>,
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pub message: Option<String>,
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pub stack: Option<String>,
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pub cause: Option<Box<JsError>>,
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pub exception_message: String,
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pub frames: Vec<JsStackFrame>,
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pub source_line: Option<String>,
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pub source_line_frame_index: Option<usize>,
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pub aggregated: Option<Vec<JsError>>,
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}
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#[derive(Debug, Eq, PartialEq, Clone, serde::Deserialize, serde::Serialize)]
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#[serde(rename_all = "camelCase")]
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pub struct JsStackFrame {
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pub type_name: Option<String>,
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pub function_name: Option<String>,
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pub method_name: Option<String>,
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pub file_name: Option<String>,
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pub line_number: Option<i64>,
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pub column_number: Option<i64>,
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pub eval_origin: Option<String>,
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// Warning! isToplevel has inconsistent snake<>camel case, "typo" originates in v8:
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// https://source.chromium.org/search?q=isToplevel&sq=&ss=chromium%2Fchromium%2Fsrc:v8%2F
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#[serde(rename = "isToplevel")]
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pub is_top_level: Option<bool>,
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pub is_eval: bool,
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pub is_native: bool,
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pub is_constructor: bool,
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pub is_async: bool,
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pub is_promise_all: bool,
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pub promise_index: Option<i64>,
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}
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impl JsStackFrame {
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pub fn from_location(
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file_name: Option<String>,
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line_number: Option<i64>,
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column_number: Option<i64>,
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) -> Self {
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Self {
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type_name: None,
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function_name: None,
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method_name: None,
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file_name,
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line_number,
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column_number,
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eval_origin: None,
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is_top_level: None,
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is_eval: false,
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is_native: false,
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is_constructor: false,
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is_async: false,
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is_promise_all: false,
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promise_index: None,
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}
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}
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}
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fn get_property<'a>(
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scope: &mut v8::HandleScope<'a>,
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object: v8::Local<v8::Object>,
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key: &str,
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) -> Option<v8::Local<'a, v8::Value>> {
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let key = v8::String::new(scope, key).unwrap();
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object.get(scope, key.into())
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}
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#[derive(Default, serde::Deserialize)]
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pub(crate) struct NativeJsError {
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pub name: Option<String>,
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pub message: Option<String>,
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// Warning! .stack is special so handled by itself
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// stack: Option<String>,
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}
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impl JsError {
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pub fn from_v8_exception(
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scope: &mut v8::HandleScope,
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exception: v8::Local<v8::Value>,
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) -> Self {
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Self::inner_from_v8_exception(scope, exception, Default::default())
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}
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pub fn from_v8_message<'a>(
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scope: &'a mut v8::HandleScope,
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msg: v8::Local<'a, v8::Message>,
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) -> Self {
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// Create a new HandleScope because we're creating a lot of new local
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// handles below.
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let scope = &mut v8::HandleScope::new(scope);
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let exception_message = msg.get(scope).to_rust_string_lossy(scope);
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let state_rc = JsRuntime::state(scope);
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// Convert them into Vec<JsStackFrame>
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let mut frames: Vec<JsStackFrame> = vec![];
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let mut source_line = None;
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let mut source_line_frame_index = None;
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{
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let state = &mut *state_rc.borrow_mut();
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let script_resource_name = msg
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.get_script_resource_name(scope)
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.and_then(|v| v8::Local::<v8::String>::try_from(v).ok())
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.map(|v| v.to_rust_string_lossy(scope));
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let line_number: Option<i64> =
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msg.get_line_number(scope).and_then(|v| v.try_into().ok());
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let column_number: Option<i64> = msg.get_start_column().try_into().ok();
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if let (Some(f), Some(l), Some(c)) =
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(script_resource_name, line_number, column_number)
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{
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// V8's column numbers are 0-based, we want 1-based.
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let c = c + 1;
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if let Some(source_map_getter) = &state.source_map_getter {
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let (f, l, c) = apply_source_map(
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f,
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l,
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c,
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&mut state.source_map_cache,
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source_map_getter.as_ref(),
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);
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frames = vec![JsStackFrame::from_location(Some(f), Some(l), Some(c))];
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} else {
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frames = vec![JsStackFrame::from_location(Some(f), Some(l), Some(c))];
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}
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}
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if let Some(source_map_getter) = &state.source_map_getter {
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for (i, frame) in frames.iter().enumerate() {
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if let (Some(file_name), Some(line_number)) =
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(&frame.file_name, frame.line_number)
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{
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if !file_name.trim_start_matches('[').starts_with("deno:") {
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source_line = get_source_line(
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file_name,
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line_number,
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&mut state.source_map_cache,
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source_map_getter.as_ref(),
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);
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source_line_frame_index = Some(i);
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break;
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}
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}
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}
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}
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}
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Self {
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name: None,
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message: None,
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exception_message,
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cause: None,
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source_line,
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source_line_frame_index,
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frames,
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stack: None,
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aggregated: None,
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}
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}
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fn inner_from_v8_exception<'a>(
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scope: &'a mut v8::HandleScope,
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exception: v8::Local<'a, v8::Value>,
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mut seen: HashSet<v8::Local<'a, v8::Object>>,
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) -> Self {
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// Create a new HandleScope because we're creating a lot of new local
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// handles below.
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let scope = &mut v8::HandleScope::new(scope);
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let msg = v8::Exception::create_message(scope, exception);
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let mut exception_message = None;
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let context_state_rc = JsRealm::state_from_scope(scope);
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let js_format_exception_cb =
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context_state_rc.borrow().js_format_exception_cb.clone();
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if let Some(format_exception_cb) = js_format_exception_cb {
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let format_exception_cb = format_exception_cb.open(scope);
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let this = v8::undefined(scope).into();
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let formatted = format_exception_cb.call(scope, this, &[exception]);
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if let Some(formatted) = formatted {
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if formatted.is_string() {
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exception_message = Some(formatted.to_rust_string_lossy(scope));
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}
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}
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}
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if is_instance_of_error(scope, exception) {
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let v8_exception = exception;
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// The exception is a JS Error object.
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let exception: v8::Local<v8::Object> = exception.try_into().unwrap();
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let cause = get_property(scope, exception, "cause");
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let e: NativeJsError =
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serde_v8::from_v8(scope, exception.into()).unwrap_or_default();
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// Get the message by formatting error.name and error.message.
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let name = e.name.clone().unwrap_or_else(|| "Error".to_string());
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let message_prop = e.message.clone().unwrap_or_default();
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let exception_message = exception_message.unwrap_or_else(|| {
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if !name.is_empty() && !message_prop.is_empty() {
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format!("Uncaught {name}: {message_prop}")
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} else if !name.is_empty() {
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format!("Uncaught {name}")
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} else if !message_prop.is_empty() {
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format!("Uncaught {message_prop}")
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} else {
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"Uncaught".to_string()
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}
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});
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let cause = cause.and_then(|cause| {
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if cause.is_undefined() || seen.contains(&exception) {
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None
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} else {
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seen.insert(exception);
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Some(Box::new(JsError::inner_from_v8_exception(
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scope, cause, seen,
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)))
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}
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});
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// Access error.stack to ensure that prepareStackTrace() has been called.
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// This should populate error.__callSiteEvals.
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let stack = get_property(scope, exception, "stack");
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let stack: Option<v8::Local<v8::String>> =
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stack.and_then(|s| s.try_into().ok());
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let stack = stack.map(|s| s.to_rust_string_lossy(scope));
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// Read an array of structured frames from error.__callSiteEvals.
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let frames_v8 = get_property(scope, exception, "__callSiteEvals");
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// Ignore non-array values
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let frames_v8: Option<v8::Local<v8::Array>> =
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frames_v8.and_then(|a| a.try_into().ok());
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// Convert them into Vec<JsStackFrame>
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let mut frames: Vec<JsStackFrame> = match frames_v8 {
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Some(frames_v8) => serde_v8::from_v8(scope, frames_v8.into()).unwrap(),
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None => vec![],
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};
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let mut source_line = None;
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let mut source_line_frame_index = None;
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{
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let state_rc = JsRuntime::state(scope);
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let state = &mut *state_rc.borrow_mut();
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// When the stack frame array is empty, but the source location given by
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// (script_resource_name, line_number, start_column + 1) exists, this is
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// likely a syntax error. For the sake of formatting we treat it like it
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// was given as a single stack frame.
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if frames.is_empty() {
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let script_resource_name = msg
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.get_script_resource_name(scope)
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.and_then(|v| v8::Local::<v8::String>::try_from(v).ok())
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.map(|v| v.to_rust_string_lossy(scope));
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let line_number: Option<i64> =
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msg.get_line_number(scope).and_then(|v| v.try_into().ok());
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let column_number: Option<i64> =
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msg.get_start_column().try_into().ok();
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if let (Some(f), Some(l), Some(c)) =
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(script_resource_name, line_number, column_number)
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{
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// V8's column numbers are 0-based, we want 1-based.
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let c = c + 1;
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if let Some(source_map_getter) = &state.source_map_getter {
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let (f, l, c) = apply_source_map(
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f,
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l,
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c,
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&mut state.source_map_cache,
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source_map_getter.as_ref(),
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);
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frames =
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vec![JsStackFrame::from_location(Some(f), Some(l), Some(c))];
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} else {
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frames =
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vec![JsStackFrame::from_location(Some(f), Some(l), Some(c))];
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}
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}
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}
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if let Some(source_map_getter) = &state.source_map_getter {
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for (i, frame) in frames.iter().enumerate() {
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if let (Some(file_name), Some(line_number)) =
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(&frame.file_name, frame.line_number)
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{
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if !file_name.trim_start_matches('[').starts_with("deno:") {
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source_line = get_source_line(
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file_name,
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line_number,
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&mut state.source_map_cache,
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source_map_getter.as_ref(),
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);
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source_line_frame_index = Some(i);
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break;
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}
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}
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}
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} else if let Some(frame) = frames.first() {
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if let Some(file_name) = &frame.file_name {
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if !file_name.trim_start_matches('[').starts_with("deno:") {
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source_line = msg
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.get_source_line(scope)
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.map(|v| v.to_rust_string_lossy(scope));
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source_line_frame_index = Some(0);
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}
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}
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}
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}
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let mut aggregated: Option<Vec<JsError>> = None;
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if is_aggregate_error(scope, v8_exception) {
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// Read an array of stored errors, this is only defined for `AggregateError`
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let aggregated_errors = get_property(scope, exception, "errors");
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let aggregated_errors: Option<v8::Local<v8::Array>> =
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aggregated_errors.and_then(|a| a.try_into().ok());
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if let Some(errors) = aggregated_errors {
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if errors.length() > 0 {
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let mut agg = vec![];
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for i in 0..errors.length() {
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let error = errors.get_index(scope, i).unwrap();
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let js_error = Self::from_v8_exception(scope, error);
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agg.push(js_error);
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}
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aggregated = Some(agg);
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}
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}
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};
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Self {
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name: e.name,
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message: e.message,
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exception_message,
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cause,
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source_line,
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source_line_frame_index,
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frames,
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stack,
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aggregated,
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}
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} else {
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let exception_message = exception_message
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|
.unwrap_or_else(|| msg.get(scope).to_rust_string_lossy(scope));
|
|
// The exception is not a JS Error object.
|
|
// Get the message given by V8::Exception::create_message(), and provide
|
|
// empty frames.
|
|
Self {
|
|
name: None,
|
|
message: None,
|
|
exception_message,
|
|
cause: None,
|
|
source_line: None,
|
|
source_line_frame_index: None,
|
|
frames: vec![],
|
|
stack: None,
|
|
aggregated: None,
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl std::error::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 Display for JsError {
|
|
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
|
|
if let Some(stack) = &self.stack {
|
|
let stack_lines = stack.lines();
|
|
if stack_lines.count() > 1 {
|
|
return write!(f, "{stack}");
|
|
}
|
|
}
|
|
write!(f, "{}", self.exception_message)?;
|
|
let frame = self.frames.first();
|
|
if let Some(frame) = frame {
|
|
if let (Some(f_), Some(l), Some(c)) =
|
|
(&frame.file_name, frame.line_number, frame.column_number)
|
|
{
|
|
let source_loc = format_source_loc(f_, l, c);
|
|
write!(f, "\n at {source_loc}")?;
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
// TODO(piscisaureus): rusty_v8 should implement the Error trait on
|
|
// values of type v8::Global<T>.
|
|
pub(crate) fn to_v8_type_error(
|
|
scope: &mut v8::HandleScope,
|
|
err: Error,
|
|
) -> v8::Global<v8::Value> {
|
|
let err_string = err.to_string();
|
|
let error_chain = err
|
|
.chain()
|
|
.skip(1)
|
|
.filter(|e| e.to_string() != err_string)
|
|
.map(|e| e.to_string())
|
|
.collect::<Vec<_>>();
|
|
|
|
let message = if !error_chain.is_empty() {
|
|
format!(
|
|
"{}\n Caused by:\n {}",
|
|
err_string,
|
|
error_chain.join("\n ")
|
|
)
|
|
} else {
|
|
err_string
|
|
};
|
|
|
|
let message = v8::String::new(scope, &message).unwrap();
|
|
let exception = v8::Exception::type_error(scope, message);
|
|
v8::Global::new(scope, exception)
|
|
}
|
|
|
|
/// Implements `value instanceof primordials.Error` in JS. Similar to
|
|
/// `Value::is_native_error()` but more closely matches the semantics
|
|
/// of `instanceof`. `Value::is_native_error()` also checks for static class
|
|
/// inheritance rather than just scanning the prototype chain, which doesn't
|
|
/// work with our WebIDL implementation of `DOMException`.
|
|
pub(crate) fn is_instance_of_error(
|
|
scope: &mut v8::HandleScope,
|
|
value: v8::Local<v8::Value>,
|
|
) -> bool {
|
|
if !value.is_object() {
|
|
return false;
|
|
}
|
|
let message = v8::String::empty(scope);
|
|
let error_prototype = v8::Exception::error(scope, message)
|
|
.to_object(scope)
|
|
.unwrap()
|
|
.get_prototype(scope)
|
|
.unwrap();
|
|
let mut maybe_prototype =
|
|
value.to_object(scope).unwrap().get_prototype(scope);
|
|
while let Some(prototype) = maybe_prototype {
|
|
if !prototype.is_object() {
|
|
return false;
|
|
}
|
|
if prototype.strict_equals(error_prototype) {
|
|
return true;
|
|
}
|
|
maybe_prototype = prototype
|
|
.to_object(scope)
|
|
.and_then(|o| o.get_prototype(scope));
|
|
}
|
|
false
|
|
}
|
|
|
|
/// Implements `value instanceof primordials.AggregateError` in JS,
|
|
/// by walking the prototype chain, and comparing each links constructor `name` property.
|
|
///
|
|
/// NOTE: There is currently no way to detect `AggregateError` via `rusty_v8`,
|
|
/// as v8 itself doesn't expose `v8__Exception__AggregateError`,
|
|
/// and we cannot create bindings for it. This forces us to rely on `name` inference.
|
|
pub(crate) fn is_aggregate_error(
|
|
scope: &mut v8::HandleScope,
|
|
value: v8::Local<v8::Value>,
|
|
) -> bool {
|
|
let mut maybe_prototype = Some(value);
|
|
while let Some(prototype) = maybe_prototype {
|
|
if !prototype.is_object() {
|
|
return false;
|
|
}
|
|
|
|
let prototype = prototype.to_object(scope).unwrap();
|
|
let prototype_name = match get_property(scope, prototype, "constructor") {
|
|
Some(constructor) => {
|
|
let ctor = constructor.to_object(scope).unwrap();
|
|
get_property(scope, ctor, "name").map(|v| v.to_rust_string_lossy(scope))
|
|
}
|
|
None => return false,
|
|
};
|
|
|
|
if prototype_name == Some(String::from("AggregateError")) {
|
|
return true;
|
|
}
|
|
|
|
maybe_prototype = prototype.get_prototype(scope);
|
|
}
|
|
|
|
false
|
|
}
|
|
|
|
const DATA_URL_ABBREV_THRESHOLD: usize = 150;
|
|
|
|
pub fn format_file_name(file_name: &str) -> String {
|
|
abbrev_file_name(file_name).unwrap_or_else(|| file_name.to_string())
|
|
}
|
|
|
|
fn abbrev_file_name(file_name: &str) -> Option<String> {
|
|
if file_name.len() <= DATA_URL_ABBREV_THRESHOLD {
|
|
return None;
|
|
}
|
|
let url = Url::parse(file_name).ok()?;
|
|
if url.scheme() != "data" {
|
|
return None;
|
|
}
|
|
let (head, tail) = url.path().split_once(',')?;
|
|
let len = tail.len();
|
|
let start = tail.get(0..20)?;
|
|
let end = tail.get(len - 20..)?;
|
|
Some(format!("{}:{},{}......{}", url.scheme(), head, start, end))
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn test_bad_resource() {
|
|
let err = bad_resource("Resource has been closed");
|
|
assert_eq!(err.to_string(), "Resource has been closed");
|
|
}
|
|
|
|
#[test]
|
|
fn test_bad_resource_id() {
|
|
let err = bad_resource_id();
|
|
assert_eq!(err.to_string(), "Bad resource ID");
|
|
}
|
|
}
|