mirror of
https://github.com/denoland/deno
synced 2024-08-25 11:07:24 +00:00
688 lines
24 KiB
Rust
688 lines
24 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use std::rc::Rc;
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use std::sync::atomic::AtomicI32;
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use std::sync::atomic::Ordering::Relaxed;
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use std::sync::Arc;
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use std::task::Context;
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use std::task::Poll;
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use std::time::Instant;
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use deno_broadcast_channel::InMemoryBroadcastChannel;
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use deno_cache::CreateCache;
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use deno_cache::SqliteBackedCache;
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use deno_core::ascii_str;
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use deno_core::error::AnyError;
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use deno_core::error::JsError;
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use deno_core::merge_op_metrics;
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use deno_core::v8;
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use deno_core::CompiledWasmModuleStore;
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use deno_core::Extension;
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use deno_core::FeatureChecker;
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use deno_core::FsModuleLoader;
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use deno_core::GetErrorClassFn;
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use deno_core::JsRuntime;
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use deno_core::LocalInspectorSession;
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use deno_core::ModuleCode;
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use deno_core::ModuleId;
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use deno_core::ModuleLoader;
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use deno_core::ModuleSpecifier;
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use deno_core::OpMetricsFactoryFn;
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use deno_core::OpMetricsSummaryTracker;
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use deno_core::RuntimeOptions;
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use deno_core::SharedArrayBufferStore;
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use deno_core::Snapshot;
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use deno_core::SourceMapGetter;
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use deno_cron::local::LocalCronHandler;
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use deno_fs::FileSystem;
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use deno_http::DefaultHttpPropertyExtractor;
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use deno_io::Stdio;
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use deno_kv::dynamic::MultiBackendDbHandler;
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use deno_node::SUPPORTED_BUILTIN_NODE_MODULES_WITH_PREFIX;
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use deno_tls::RootCertStoreProvider;
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use deno_web::BlobStore;
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use log::debug;
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use crate::inspector_server::InspectorServer;
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use crate::ops;
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use crate::permissions::PermissionsContainer;
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use crate::shared::runtime;
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use crate::BootstrapOptions;
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pub type FormatJsErrorFn = dyn Fn(&JsError) -> String + Sync + Send;
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#[derive(Clone, Default)]
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pub struct ExitCode(Arc<AtomicI32>);
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impl ExitCode {
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pub fn get(&self) -> i32 {
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self.0.load(Relaxed)
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}
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pub fn set(&mut self, code: i32) {
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self.0.store(code, Relaxed);
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}
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}
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/// This worker is created and used by almost all
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/// subcommands in Deno executable.
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///
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/// It provides ops available in the `Deno` namespace.
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///
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/// All `WebWorker`s created during program execution
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/// are descendants of this worker.
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pub struct MainWorker {
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pub js_runtime: JsRuntime,
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should_break_on_first_statement: bool,
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should_wait_for_inspector_session: bool,
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exit_code: ExitCode,
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bootstrap_fn_global: Option<v8::Global<v8::Function>>,
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}
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pub struct WorkerOptions {
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pub bootstrap: BootstrapOptions,
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/// JsRuntime extensions, not to be confused with ES modules.
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///
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/// Extensions register "ops" and JavaScript sources provided in `js` or `esm`
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/// configuration. If you are using a snapshot, then extensions shouldn't
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/// provide JavaScript sources that were already snapshotted.
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pub extensions: Vec<Extension>,
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/// V8 snapshot that should be loaded on startup.
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pub startup_snapshot: Option<Snapshot>,
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/// Should op registration be skipped?
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pub skip_op_registration: bool,
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/// Optional isolate creation parameters, such as heap limits.
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pub create_params: Option<v8::CreateParams>,
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pub unsafely_ignore_certificate_errors: Option<Vec<String>>,
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pub root_cert_store_provider: Option<Arc<dyn RootCertStoreProvider>>,
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pub seed: Option<u64>,
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pub fs: Arc<dyn FileSystem>,
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/// Implementation of `ModuleLoader` which will be
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/// called when V8 requests to load ES modules.
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///
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/// If not provided runtime will error if code being
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/// executed tries to load modules.
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pub module_loader: Rc<dyn ModuleLoader>,
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pub npm_resolver: Option<Arc<dyn deno_node::NpmResolver>>,
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// Callbacks invoked when creating new instance of WebWorker
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pub create_web_worker_cb: Arc<ops::worker_host::CreateWebWorkerCb>,
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pub format_js_error_fn: Option<Arc<FormatJsErrorFn>>,
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/// Source map reference for errors.
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pub source_map_getter: Option<Box<dyn SourceMapGetter>>,
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pub maybe_inspector_server: Option<Arc<InspectorServer>>,
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// If true, the worker will wait for inspector session and break on first
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// statement of user code. Takes higher precedence than
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// `should_wait_for_inspector_session`.
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pub should_break_on_first_statement: bool,
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// If true, the worker will wait for inspector session before executing
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// user code.
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pub should_wait_for_inspector_session: bool,
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/// If Some, print a low-level trace output for ops matching the given patterns.
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pub strace_ops: Option<Vec<String>>,
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/// Allows to map error type to a string "class" used to represent
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/// error in JavaScript.
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pub get_error_class_fn: Option<GetErrorClassFn>,
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pub cache_storage_dir: Option<std::path::PathBuf>,
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pub origin_storage_dir: Option<std::path::PathBuf>,
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pub blob_store: Arc<BlobStore>,
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pub broadcast_channel: InMemoryBroadcastChannel,
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/// The store to use for transferring SharedArrayBuffers between isolates.
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/// If multiple isolates should have the possibility of sharing
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/// SharedArrayBuffers, they should use the same [SharedArrayBufferStore]. If
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/// no [SharedArrayBufferStore] is specified, SharedArrayBuffer can not be
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/// serialized.
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pub shared_array_buffer_store: Option<SharedArrayBufferStore>,
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/// The store to use for transferring `WebAssembly.Module` objects between
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/// isolates.
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/// If multiple isolates should have the possibility of sharing
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/// `WebAssembly.Module` objects, they should use the same
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/// [CompiledWasmModuleStore]. If no [CompiledWasmModuleStore] is specified,
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/// `WebAssembly.Module` objects cannot be serialized.
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pub compiled_wasm_module_store: Option<CompiledWasmModuleStore>,
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pub stdio: Stdio,
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pub feature_checker: Arc<FeatureChecker>,
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}
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impl Default for WorkerOptions {
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fn default() -> Self {
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Self {
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create_web_worker_cb: Arc::new(|_| {
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unimplemented!("web workers are not supported")
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}),
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fs: Arc::new(deno_fs::RealFs),
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module_loader: Rc::new(FsModuleLoader),
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skip_op_registration: false,
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seed: None,
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unsafely_ignore_certificate_errors: Default::default(),
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should_break_on_first_statement: Default::default(),
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should_wait_for_inspector_session: Default::default(),
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strace_ops: Default::default(),
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compiled_wasm_module_store: Default::default(),
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shared_array_buffer_store: Default::default(),
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maybe_inspector_server: Default::default(),
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format_js_error_fn: Default::default(),
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get_error_class_fn: Default::default(),
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origin_storage_dir: Default::default(),
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cache_storage_dir: Default::default(),
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broadcast_channel: Default::default(),
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source_map_getter: Default::default(),
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root_cert_store_provider: Default::default(),
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npm_resolver: Default::default(),
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blob_store: Default::default(),
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extensions: Default::default(),
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startup_snapshot: Default::default(),
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create_params: Default::default(),
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bootstrap: Default::default(),
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stdio: Default::default(),
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feature_checker: Default::default(),
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}
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}
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}
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fn create_op_metrics(
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enable_op_summary_metrics: bool,
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strace_ops: Option<Vec<String>>,
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) -> (
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Option<Rc<OpMetricsSummaryTracker>>,
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Option<OpMetricsFactoryFn>,
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) {
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let mut op_summary_metrics = None;
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let mut op_metrics_factory_fn: Option<OpMetricsFactoryFn> = None;
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let now = Instant::now();
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let max_len: Rc<std::cell::Cell<usize>> = Default::default();
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if let Some(patterns) = strace_ops {
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/// Match an op name against a list of patterns
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fn matches_pattern(patterns: &[String], name: &str) -> bool {
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let mut found_match = false;
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let mut found_nomatch = false;
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for pattern in patterns.iter() {
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if let Some(pattern) = pattern.strip_prefix('-') {
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if name.contains(pattern) {
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return false;
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}
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} else if name.contains(pattern.as_str()) {
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found_match = true;
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} else {
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found_nomatch = true;
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}
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}
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found_match || !found_nomatch
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}
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op_metrics_factory_fn = Some(Box::new(move |_, _, decl| {
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// If we don't match a requested pattern, or we match a negative pattern, bail
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if !matches_pattern(&patterns, decl.name) {
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return None;
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}
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max_len.set(max_len.get().max(decl.name.len()));
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let max_len = max_len.clone();
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Some(Rc::new(
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move |op: &deno_core::_ops::OpCtx, event, source| {
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eprintln!(
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"[{: >10.3}] {name:max_len$}: {event:?} {source:?}",
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now.elapsed().as_secs_f64(),
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name = op.decl().name,
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max_len = max_len.get()
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);
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},
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))
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}));
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}
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if enable_op_summary_metrics {
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let summary = Rc::new(OpMetricsSummaryTracker::default());
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let summary_metrics = summary.clone().op_metrics_factory_fn(|_| true);
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op_metrics_factory_fn = Some(match op_metrics_factory_fn {
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Some(f) => merge_op_metrics(f, summary_metrics),
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None => summary_metrics,
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});
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op_summary_metrics = Some(summary);
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}
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(op_summary_metrics, op_metrics_factory_fn)
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}
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impl MainWorker {
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pub fn bootstrap_from_options(
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main_module: ModuleSpecifier,
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permissions: PermissionsContainer,
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options: WorkerOptions,
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) -> Self {
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let bootstrap_options = options.bootstrap.clone();
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let mut worker = Self::from_options(main_module, permissions, options);
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worker.bootstrap(bootstrap_options);
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worker
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}
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pub fn from_options(
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main_module: ModuleSpecifier,
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permissions: PermissionsContainer,
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mut options: WorkerOptions,
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) -> Self {
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deno_core::extension!(deno_permissions_worker,
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options = {
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permissions: PermissionsContainer,
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enable_testing_features: bool,
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},
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state = |state, options| {
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state.put::<PermissionsContainer>(options.permissions);
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state.put(ops::TestingFeaturesEnabled(options.enable_testing_features));
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},
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);
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// Get our op metrics
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let (op_summary_metrics, op_metrics_factory_fn) = create_op_metrics(
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options.bootstrap.enable_op_summary_metrics,
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options.strace_ops,
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);
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// Permissions: many ops depend on this
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let enable_testing_features = options.bootstrap.enable_testing_features;
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let exit_code = ExitCode(Arc::new(AtomicI32::new(0)));
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let create_cache = options.cache_storage_dir.map(|storage_dir| {
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let create_cache_fn = move || SqliteBackedCache::new(storage_dir.clone());
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CreateCache(Arc::new(create_cache_fn))
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});
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// NOTE(bartlomieju): ordering is important here, keep it in sync with
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// `runtime/build.rs`, `runtime/web_worker.rs` and `cli/build.rs`!
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let mut extensions = vec![
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// Web APIs
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deno_webidl::deno_webidl::init_ops_and_esm(),
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deno_console::deno_console::init_ops_and_esm(),
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deno_url::deno_url::init_ops_and_esm(),
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deno_web::deno_web::init_ops_and_esm::<PermissionsContainer>(
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options.blob_store.clone(),
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options.bootstrap.location.clone(),
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),
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deno_fetch::deno_fetch::init_ops_and_esm::<PermissionsContainer>(
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deno_fetch::Options {
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user_agent: options.bootstrap.user_agent.clone(),
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root_cert_store_provider: options.root_cert_store_provider.clone(),
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unsafely_ignore_certificate_errors: options
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.unsafely_ignore_certificate_errors
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.clone(),
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file_fetch_handler: Rc::new(deno_fetch::FsFetchHandler),
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..Default::default()
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},
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),
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deno_cache::deno_cache::init_ops_and_esm::<SqliteBackedCache>(
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create_cache,
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),
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deno_websocket::deno_websocket::init_ops_and_esm::<PermissionsContainer>(
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options.bootstrap.user_agent.clone(),
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options.root_cert_store_provider.clone(),
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options.unsafely_ignore_certificate_errors.clone(),
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),
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deno_webstorage::deno_webstorage::init_ops_and_esm(
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options.origin_storage_dir.clone(),
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),
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deno_crypto::deno_crypto::init_ops_and_esm(options.seed),
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deno_broadcast_channel::deno_broadcast_channel::init_ops_and_esm(
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options.broadcast_channel.clone(),
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),
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deno_ffi::deno_ffi::init_ops_and_esm::<PermissionsContainer>(),
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deno_net::deno_net::init_ops_and_esm::<PermissionsContainer>(
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options.root_cert_store_provider.clone(),
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options.unsafely_ignore_certificate_errors.clone(),
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),
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deno_tls::deno_tls::init_ops_and_esm(),
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deno_kv::deno_kv::init_ops_and_esm(
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MultiBackendDbHandler::remote_or_sqlite::<PermissionsContainer>(
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options.origin_storage_dir.clone(),
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options.seed,
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deno_kv::remote::HttpOptions {
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user_agent: options.bootstrap.user_agent.clone(),
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root_cert_store_provider: options.root_cert_store_provider.clone(),
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unsafely_ignore_certificate_errors: options
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.unsafely_ignore_certificate_errors
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.clone(),
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client_cert_chain_and_key: None,
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proxy: None,
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},
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),
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),
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deno_cron::deno_cron::init_ops_and_esm(LocalCronHandler::new()),
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deno_napi::deno_napi::init_ops_and_esm::<PermissionsContainer>(),
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deno_http::deno_http::init_ops_and_esm::<DefaultHttpPropertyExtractor>(),
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deno_io::deno_io::init_ops_and_esm(Some(options.stdio)),
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deno_fs::deno_fs::init_ops_and_esm::<PermissionsContainer>(
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options.fs.clone(),
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),
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deno_node::deno_node::init_ops_and_esm::<PermissionsContainer>(
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options.npm_resolver,
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options.fs,
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),
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// Ops from this crate
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ops::runtime::deno_runtime::init_ops_and_esm(main_module.clone()),
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ops::worker_host::deno_worker_host::init_ops_and_esm(
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options.create_web_worker_cb.clone(),
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options.format_js_error_fn.clone(),
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),
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ops::fs_events::deno_fs_events::init_ops_and_esm(),
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ops::os::deno_os::init_ops_and_esm(exit_code.clone()),
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ops::permissions::deno_permissions::init_ops_and_esm(),
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ops::process::deno_process::init_ops_and_esm(),
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ops::signal::deno_signal::init_ops_and_esm(),
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ops::tty::deno_tty::init_ops_and_esm(),
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ops::http::deno_http_runtime::init_ops_and_esm(),
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ops::bootstrap::deno_bootstrap::init_ops_and_esm({
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#[cfg(feature = "__runtime_js_sources")]
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{
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Some(Default::default())
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}
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#[cfg(not(feature = "__runtime_js_sources"))]
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{
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None
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}
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}),
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deno_permissions_worker::init_ops_and_esm(
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permissions,
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enable_testing_features,
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),
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runtime::init_ops_and_esm(),
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];
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for extension in &mut extensions {
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#[cfg(not(feature = "__runtime_js_sources"))]
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{
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extension.js_files = std::borrow::Cow::Borrowed(&[]);
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extension.esm_files = std::borrow::Cow::Borrowed(&[]);
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extension.esm_entry_point = None;
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}
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#[cfg(feature = "__runtime_js_sources")]
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{
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use crate::shared::maybe_transpile_source;
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for source in extension.esm_files.to_mut() {
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maybe_transpile_source(source).unwrap();
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}
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for source in extension.js_files.to_mut() {
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maybe_transpile_source(source).unwrap();
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}
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}
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}
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extensions.extend(std::mem::take(&mut options.extensions));
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#[cfg(all(feature = "include_js_files_for_snapshotting", feature = "dont_create_runtime_snapshot", not(feature = "__runtime_js_sources")))]
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options.startup_snapshot.as_ref().expect("Sources are not embedded, snapshotting was disabled and a user snapshot was not provided.");
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// Clear extension modules from the module map, except preserve `node:*`
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// modules.
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let preserve_snapshotted_modules =
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Some(SUPPORTED_BUILTIN_NODE_MODULES_WITH_PREFIX);
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let mut js_runtime = JsRuntime::new(RuntimeOptions {
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module_loader: Some(options.module_loader.clone()),
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startup_snapshot: options
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.startup_snapshot
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.or_else(crate::js::deno_isolate_init),
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create_params: options.create_params,
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source_map_getter: options.source_map_getter,
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skip_op_registration: options.skip_op_registration,
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get_error_class_fn: options.get_error_class_fn,
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shared_array_buffer_store: options.shared_array_buffer_store.clone(),
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compiled_wasm_module_store: options.compiled_wasm_module_store.clone(),
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extensions,
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preserve_snapshotted_modules,
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inspector: options.maybe_inspector_server.is_some(),
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is_main: true,
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feature_checker: Some(options.feature_checker.clone()),
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op_metrics_factory_fn,
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..Default::default()
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});
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if let Some(op_summary_metrics) = op_summary_metrics {
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js_runtime.op_state().borrow_mut().put(op_summary_metrics);
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}
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if let Some(server) = options.maybe_inspector_server.clone() {
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server.register_inspector(
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main_module.to_string(),
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&mut js_runtime,
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options.should_break_on_first_statement
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|| options.should_wait_for_inspector_session,
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);
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// Put inspector handle into the op state so we can put a breakpoint when
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// executing a CJS entrypoint.
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let op_state = js_runtime.op_state();
|
|
let inspector = js_runtime.inspector();
|
|
op_state.borrow_mut().put(inspector);
|
|
}
|
|
let bootstrap_fn_global = {
|
|
let context = js_runtime.main_context();
|
|
let scope = &mut js_runtime.handle_scope();
|
|
let context_local = v8::Local::new(scope, context);
|
|
let global_obj = context_local.global(scope);
|
|
let bootstrap_str =
|
|
v8::String::new_external_onebyte_static(scope, b"bootstrap").unwrap();
|
|
let bootstrap_ns: v8::Local<v8::Object> = global_obj
|
|
.get(scope, bootstrap_str.into())
|
|
.unwrap()
|
|
.try_into()
|
|
.unwrap();
|
|
let main_runtime_str =
|
|
v8::String::new_external_onebyte_static(scope, b"mainRuntime").unwrap();
|
|
let bootstrap_fn =
|
|
bootstrap_ns.get(scope, main_runtime_str.into()).unwrap();
|
|
let bootstrap_fn =
|
|
v8::Local::<v8::Function>::try_from(bootstrap_fn).unwrap();
|
|
v8::Global::new(scope, bootstrap_fn)
|
|
};
|
|
|
|
Self {
|
|
js_runtime,
|
|
should_break_on_first_statement: options.should_break_on_first_statement,
|
|
should_wait_for_inspector_session: options
|
|
.should_wait_for_inspector_session,
|
|
exit_code,
|
|
bootstrap_fn_global: Some(bootstrap_fn_global),
|
|
}
|
|
}
|
|
|
|
pub fn bootstrap(&mut self, options: BootstrapOptions) {
|
|
self.js_runtime.op_state().borrow_mut().put(options.clone());
|
|
let scope = &mut self.js_runtime.handle_scope();
|
|
let args = options.as_v8(scope);
|
|
let bootstrap_fn = self.bootstrap_fn_global.take().unwrap();
|
|
let bootstrap_fn = v8::Local::new(scope, bootstrap_fn);
|
|
let undefined = v8::undefined(scope);
|
|
bootstrap_fn.call(scope, undefined.into(), &[args]).unwrap();
|
|
}
|
|
|
|
/// See [JsRuntime::execute_script](deno_core::JsRuntime::execute_script)
|
|
pub fn execute_script(
|
|
&mut self,
|
|
script_name: &'static str,
|
|
source_code: ModuleCode,
|
|
) -> Result<v8::Global<v8::Value>, AnyError> {
|
|
self.js_runtime.execute_script(script_name, source_code)
|
|
}
|
|
|
|
/// Loads and instantiates specified JavaScript module as "main" module.
|
|
pub async fn preload_main_module(
|
|
&mut self,
|
|
module_specifier: &ModuleSpecifier,
|
|
) -> Result<ModuleId, AnyError> {
|
|
self
|
|
.js_runtime
|
|
.load_main_module(module_specifier, None)
|
|
.await
|
|
}
|
|
|
|
/// Loads and instantiates specified JavaScript module as "side" module.
|
|
pub async fn preload_side_module(
|
|
&mut self,
|
|
module_specifier: &ModuleSpecifier,
|
|
) -> Result<ModuleId, AnyError> {
|
|
self
|
|
.js_runtime
|
|
.load_side_module(module_specifier, None)
|
|
.await
|
|
}
|
|
|
|
/// Executes specified JavaScript module.
|
|
pub async fn evaluate_module(
|
|
&mut self,
|
|
id: ModuleId,
|
|
) -> Result<(), AnyError> {
|
|
self.wait_for_inspector_session();
|
|
let mut receiver = self.js_runtime.mod_evaluate(id);
|
|
tokio::select! {
|
|
// Not using biased mode leads to non-determinism for relatively simple
|
|
// programs.
|
|
biased;
|
|
|
|
maybe_result = &mut receiver => {
|
|
debug!("received module evaluate {:#?}", maybe_result);
|
|
maybe_result.expect("Module evaluation result not provided.")
|
|
}
|
|
|
|
event_loop_result = self.run_event_loop(false) => {
|
|
event_loop_result?;
|
|
let maybe_result = receiver.await;
|
|
maybe_result.expect("Module evaluation result not provided.")
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Loads, instantiates and executes specified JavaScript module.
|
|
pub async fn execute_side_module(
|
|
&mut self,
|
|
module_specifier: &ModuleSpecifier,
|
|
) -> Result<(), AnyError> {
|
|
let id = self.preload_side_module(module_specifier).await?;
|
|
self.evaluate_module(id).await
|
|
}
|
|
|
|
/// Loads, instantiates and executes specified JavaScript module.
|
|
///
|
|
/// This module will have "import.meta.main" equal to true.
|
|
pub async fn execute_main_module(
|
|
&mut self,
|
|
module_specifier: &ModuleSpecifier,
|
|
) -> Result<(), AnyError> {
|
|
let id = self.preload_main_module(module_specifier).await?;
|
|
self.evaluate_module(id).await
|
|
}
|
|
|
|
fn wait_for_inspector_session(&mut self) {
|
|
if self.should_break_on_first_statement {
|
|
self
|
|
.js_runtime
|
|
.inspector()
|
|
.borrow_mut()
|
|
.wait_for_session_and_break_on_next_statement();
|
|
} else if self.should_wait_for_inspector_session {
|
|
self.js_runtime.inspector().borrow_mut().wait_for_session();
|
|
}
|
|
}
|
|
|
|
/// Create new inspector session. This function panics if Worker
|
|
/// was not configured to create inspector.
|
|
pub async fn create_inspector_session(&mut self) -> LocalInspectorSession {
|
|
self.js_runtime.maybe_init_inspector();
|
|
self.js_runtime.inspector().borrow().create_local_session()
|
|
}
|
|
|
|
pub fn poll_event_loop(
|
|
&mut self,
|
|
cx: &mut Context,
|
|
wait_for_inspector: bool,
|
|
) -> Poll<Result<(), AnyError>> {
|
|
self.js_runtime.poll_event_loop2(
|
|
cx,
|
|
deno_core::PollEventLoopOptions {
|
|
wait_for_inspector,
|
|
..Default::default()
|
|
},
|
|
)
|
|
}
|
|
|
|
pub async fn run_event_loop(
|
|
&mut self,
|
|
wait_for_inspector: bool,
|
|
) -> Result<(), AnyError> {
|
|
self
|
|
.js_runtime
|
|
.run_event_loop2(deno_core::PollEventLoopOptions {
|
|
wait_for_inspector,
|
|
..Default::default()
|
|
})
|
|
.await
|
|
}
|
|
|
|
/// Return exit code set by the executed code (either in main worker
|
|
/// or one of child web workers).
|
|
pub fn exit_code(&self) -> i32 {
|
|
self.exit_code.get()
|
|
}
|
|
|
|
/// Dispatches "load" event to the JavaScript runtime.
|
|
///
|
|
/// Does not poll event loop, and thus not await any of the "load" event handlers.
|
|
pub fn dispatch_load_event(
|
|
&mut self,
|
|
script_name: &'static str,
|
|
) -> Result<(), AnyError> {
|
|
self.js_runtime.execute_script(
|
|
script_name,
|
|
// NOTE(@bartlomieju): not using `globalThis` here, because user might delete
|
|
// it. Instead we're using global `dispatchEvent` function which will
|
|
// used a saved reference to global scope.
|
|
ascii_str!("dispatchEvent(new Event('load'))"),
|
|
)?;
|
|
Ok(())
|
|
}
|
|
|
|
/// Dispatches "unload" event to the JavaScript runtime.
|
|
///
|
|
/// Does not poll event loop, and thus not await any of the "unload" event handlers.
|
|
pub fn dispatch_unload_event(
|
|
&mut self,
|
|
script_name: &'static str,
|
|
) -> Result<(), AnyError> {
|
|
self.js_runtime.execute_script(
|
|
script_name,
|
|
// NOTE(@bartlomieju): not using `globalThis` here, because user might delete
|
|
// it. Instead we're using global `dispatchEvent` function which will
|
|
// used a saved reference to global scope.
|
|
ascii_str!("dispatchEvent(new Event('unload'))"),
|
|
)?;
|
|
Ok(())
|
|
}
|
|
|
|
/// Dispatches "beforeunload" event to the JavaScript runtime. Returns a boolean
|
|
/// indicating if the event was prevented and thus event loop should continue
|
|
/// running.
|
|
pub fn dispatch_beforeunload_event(
|
|
&mut self,
|
|
script_name: &'static str,
|
|
) -> Result<bool, AnyError> {
|
|
let value = self.js_runtime.execute_script(
|
|
script_name,
|
|
// NOTE(@bartlomieju): not using `globalThis` here, because user might delete
|
|
// it. Instead we're using global `dispatchEvent` function which will
|
|
// used a saved reference to global scope.
|
|
ascii_str!(
|
|
"dispatchEvent(new Event('beforeunload', { cancelable: true }));"
|
|
),
|
|
)?;
|
|
let local_value = value.open(&mut self.js_runtime.handle_scope());
|
|
Ok(local_value.is_false())
|
|
}
|
|
}
|