mirror of
https://github.com/denoland/deno.git
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79b42808a4
Keep a cache for source maps and source lines. We sort of already had a cache argument for source map lookup functions but we just passed an empty map instead of storing it. Extended it to cache source line lookups as well and plugged it into runtime state.
501 lines
16 KiB
Rust
501 lines
16 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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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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use anyhow::Error;
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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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/// 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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/// 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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#[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, 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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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::Value>>,
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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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// Nest this state borrow. A mutable borrow can occur when accessing `stack`
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// in this outer scope, invoking `Error.prepareStackTrace()` which calls
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// `op_apply_source_map`.
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{
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let state_rc = JsRuntime::state(scope);
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let state = state_rc.borrow();
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if let Some(format_exception_cb) = &state.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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}
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if is_instance_of_error(scope, 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_else(|| "".to_string());
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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(&cause) {
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None
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} else {
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seen.insert(cause);
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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 lookup expects a 0-based line number, ours are 1-based.
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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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// 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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let mut aggregated: Option<Vec<JsError>> = None;
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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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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));
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// The exception is not a JS Error object.
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// Get the message given by V8::Exception::create_message(), and provide
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// empty frames.
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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: None,
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source_line_frame_index: None,
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frames: vec![],
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stack: None,
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aggregated: None,
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}
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}
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}
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}
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impl std::error::Error for JsError {}
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fn format_source_loc(
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file_name: &str,
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line_number: i64,
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column_number: i64,
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) -> String {
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let line_number = line_number;
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let column_number = column_number;
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format!("{}:{}:{}", file_name, line_number, column_number)
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}
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impl Display for JsError {
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
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if let Some(stack) = &self.stack {
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let stack_lines = stack.lines();
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if stack_lines.count() > 1 {
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return write!(f, "{}", stack);
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}
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}
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write!(f, "{}", self.exception_message)?;
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let frame = self.frames.first();
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if let Some(frame) = frame {
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if let (Some(f_), Some(l), Some(c)) =
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(&frame.file_name, frame.line_number, frame.column_number)
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{
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let source_loc = format_source_loc(f_, l, c);
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write!(f, "\n at {}", source_loc)?;
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}
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}
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Ok(())
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}
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}
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// TODO(piscisaureus): rusty_v8 should implement the Error trait on
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// values of type v8::Global<T>.
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pub(crate) fn to_v8_type_error(
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scope: &mut v8::HandleScope,
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err: Error,
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) -> v8::Global<v8::Value> {
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let message = err.to_string();
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let message = v8::String::new(scope, &message).unwrap();
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let exception = v8::Exception::type_error(scope, message);
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v8::Global::new(scope, exception)
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}
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/// Implements `value instanceof primordials.Error` in JS. Similar to
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/// `Value::is_native_error()` but more closely matches the semantics
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/// of `instanceof`. `Value::is_native_error()` also checks for static class
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/// inheritance rather than just scanning the prototype chain, which doesn't
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/// work with our WebIDL implementation of `DOMException`.
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pub(crate) fn is_instance_of_error<'s>(
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scope: &mut v8::HandleScope<'s>,
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value: v8::Local<v8::Value>,
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) -> bool {
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if !value.is_object() {
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return false;
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}
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let message = v8::String::empty(scope);
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let error_prototype = v8::Exception::error(scope, message)
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.to_object(scope)
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.unwrap()
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.get_prototype(scope)
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.unwrap();
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let mut maybe_prototype =
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value.to_object(scope).unwrap().get_prototype(scope);
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while let Some(prototype) = maybe_prototype {
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if !prototype.is_object() {
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return false;
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}
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if prototype.strict_equals(error_prototype) {
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return true;
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}
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maybe_prototype = prototype
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.to_object(scope)
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.and_then(|o| o.get_prototype(scope));
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}
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false
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}
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const DATA_URL_ABBREV_THRESHOLD: usize = 150;
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pub fn format_file_name(file_name: &str) -> String {
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abbrev_file_name(file_name).unwrap_or_else(|| file_name.to_string())
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}
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fn abbrev_file_name(file_name: &str) -> Option<String> {
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if file_name.len() <= DATA_URL_ABBREV_THRESHOLD {
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return None;
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}
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let url = Url::parse(file_name).ok()?;
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if url.scheme() != "data" {
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return None;
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}
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let (head, tail) = url.path().split_once(',')?;
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let len = tail.len();
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let start = tail.get(0..20)?;
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let end = tail.get(len - 20..)?;
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Some(format!("{}:{},{}......{}", url.scheme(), head, start, end))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_bad_resource() {
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let err = bad_resource("Resource has been closed");
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assert_eq!(err.to_string(), "Resource has been closed");
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}
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#[test]
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fn test_bad_resource_id() {
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let err = bad_resource_id();
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assert_eq!(err.to_string(), "Bad resource ID");
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}
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}
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