/
script_module.rs
1431 lines (1183 loc) · 47.3 KB
/
script_module.rs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
//! The script module mod contains common traits and structs
//! related to `type=module` for script thread or worker threads.
use crate::compartments::{enter_realm, AlreadyInCompartment, InCompartment};
use crate::document_loader::LoadType;
use crate::dom::bindings::cell::DomRefCell;
use crate::dom::bindings::codegen::Bindings::WindowBinding::WindowBinding::WindowMethods;
use crate::dom::bindings::conversions::jsstring_to_str;
use crate::dom::bindings::error::report_pending_exception;
use crate::dom::bindings::error::Error;
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::refcounted::{Trusted, TrustedPromise};
use crate::dom::bindings::reflector::DomObject;
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::settings_stack::AutoIncumbentScript;
use crate::dom::bindings::str::DOMString;
use crate::dom::bindings::trace::RootedTraceableBox;
use crate::dom::document::Document;
use crate::dom::element::Element;
use crate::dom::globalscope::GlobalScope;
use crate::dom::htmlscriptelement::{HTMLScriptElement, ScriptId};
use crate::dom::htmlscriptelement::{ScriptOrigin, ScriptType, SCRIPT_JS_MIMES};
use crate::dom::node::document_from_node;
use crate::dom::performanceresourcetiming::InitiatorType;
use crate::dom::promise::Promise;
use crate::dom::promisenativehandler::{Callback, PromiseNativeHandler};
use crate::dom::window::Window;
use crate::dom::worker::TrustedWorkerAddress;
use crate::network_listener::{self, NetworkListener};
use crate::network_listener::{PreInvoke, ResourceTimingListener};
use crate::task::TaskBox;
use crate::task_source::TaskSourceName;
use encoding_rs::UTF_8;
use hyper_serde::Serde;
use ipc_channel::ipc;
use ipc_channel::router::ROUTER;
use js::glue::{AppendToAutoObjectVector, CreateAutoObjectVector};
use js::jsapi::Handle as RawHandle;
use js::jsapi::HandleObject;
use js::jsapi::HandleValue as RawHandleValue;
use js::jsapi::{AutoObjectVector, JSAutoRealm, JSObject, JSString};
use js::jsapi::{GetModuleResolveHook, JSRuntime, SetModuleResolveHook};
use js::jsapi::{GetRequestedModules, SetModuleMetadataHook};
use js::jsapi::{GetWaitForAllPromise, ModuleEvaluate, ModuleInstantiate, SourceText};
use js::jsapi::{Heap, JSContext, JS_ClearPendingException, SetModulePrivate};
use js::jsapi::{SetModuleDynamicImportHook, SetScriptPrivateReferenceHooks};
use js::jsval::{JSVal, PrivateValue, UndefinedValue};
use js::rust::jsapi_wrapped::{CompileModule, JS_GetArrayLength, JS_GetElement};
use js::rust::jsapi_wrapped::{GetRequestedModuleSpecifier, JS_GetPendingException};
use js::rust::wrappers::JS_SetPendingException;
use js::rust::CompileOptionsWrapper;
use js::rust::IntoHandle;
use js::rust::{Handle, HandleValue};
use net_traits::request::{CredentialsMode, Destination, ParserMetadata};
use net_traits::request::{Referrer, RequestBuilder, RequestMode};
use net_traits::{FetchMetadata, Metadata};
use net_traits::{FetchResponseListener, NetworkError};
use net_traits::{ResourceFetchTiming, ResourceTimingType};
use servo_url::ServoUrl;
use std::cmp::Ordering;
use std::collections::{HashMap, HashSet};
use std::ffi;
use std::marker::PhantomData;
use std::ptr;
use std::rc::Rc;
use std::sync::{Arc, Mutex};
use url::ParseError as UrlParseError;
use indexmap::IndexSet;
pub fn get_source_text(source: &[u16]) -> SourceText<u16> {
SourceText {
units_: source.as_ptr() as *const _,
length_: source.len() as u32,
ownsUnits_: false,
_phantom_0: PhantomData,
}
}
#[allow(unsafe_code)]
unsafe fn gen_type_error(global: &GlobalScope, string: String) -> ModuleError {
rooted!(in(*global.get_cx()) let mut thrown = UndefinedValue());
Error::Type(string).to_jsval(*global.get_cx(), &global, thrown.handle_mut());
return ModuleError::RawException(RootedTraceableBox::from_box(Heap::boxed(thrown.get())));
}
#[derive(JSTraceable)]
pub struct ModuleObject(Box<Heap<*mut JSObject>>);
impl ModuleObject {
#[allow(unsafe_code)]
pub fn handle(&self) -> HandleObject {
unsafe { self.0.handle() }
}
}
#[derive(JSTraceable)]
pub enum ModuleError {
Network(NetworkError),
RawException(RootedTraceableBox<Heap<JSVal>>),
}
impl Eq for ModuleError {}
impl PartialEq for ModuleError {
fn eq(&self, other: &Self) -> bool {
match (self, other) {
(Self::Network(_), Self::RawException(_)) |
(Self::RawException(_), Self::Network(_)) => false,
_ => true,
}
}
}
impl Ord for ModuleError {
fn cmp(&self, other: &Self) -> Ordering {
match (self, other) {
(Self::Network(_), Self::RawException(_)) => Ordering::Greater,
(Self::RawException(_), Self::Network(_)) => Ordering::Less,
_ => Ordering::Equal,
}
}
}
impl PartialOrd for ModuleError {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl ModuleError {
#[allow(unsafe_code)]
pub fn handle(&self) -> Handle<JSVal> {
match self {
Self::Network(_) => unreachable!(),
Self::RawException(exception) => exception.handle(),
}
}
}
impl Clone for ModuleError {
fn clone(&self) -> Self {
match self {
Self::Network(network_error) => Self::Network(network_error.clone()),
Self::RawException(exception) => Self::RawException(RootedTraceableBox::from_box(
Heap::boxed(exception.get().clone()),
)),
}
}
}
struct ModuleScript {
base_url: ServoUrl,
}
#[derive(JSTraceable)]
pub struct ModuleTree {
url: ServoUrl,
text: DomRefCell<DOMString>,
record: DomRefCell<Option<ModuleObject>>,
status: DomRefCell<ModuleStatus>,
// The spec maintains load order for descendants, so we use an indexset for descendants and
// parents. This isn't actually necessary for parents however the IndexSet APIs don't
// interop with HashSet, and IndexSet isn't very expensive
// (https://github.com/bluss/indexmap/issues/110)
//
// By default all maps in web specs are ordered maps
// (https://infra.spec.whatwg.org/#ordered-map), however we can usually get away with using
// stdlib maps and sets because we rarely iterate over them.
parent_urls: DomRefCell<IndexSet<ServoUrl>>,
descendant_urls: DomRefCell<IndexSet<ServoUrl>>,
visited_urls: DomRefCell<HashSet<ServoUrl>>,
error: DomRefCell<Option<ModuleError>>,
promise: DomRefCell<Option<Rc<Promise>>>,
}
impl ModuleTree {
pub fn new(url: ServoUrl) -> Self {
ModuleTree {
url,
text: DomRefCell::new(DOMString::new()),
record: DomRefCell::new(None),
status: DomRefCell::new(ModuleStatus::Initial),
parent_urls: DomRefCell::new(IndexSet::new()),
descendant_urls: DomRefCell::new(IndexSet::new()),
visited_urls: DomRefCell::new(HashSet::new()),
error: DomRefCell::new(None),
promise: DomRefCell::new(None),
}
}
pub fn get_promise(&self) -> &DomRefCell<Option<Rc<Promise>>> {
&self.promise
}
pub fn set_promise(&self, promise: Rc<Promise>) {
*self.promise.borrow_mut() = Some(promise);
}
pub fn get_status(&self) -> ModuleStatus {
self.status.borrow().clone()
}
pub fn set_status(&self, status: ModuleStatus) {
*self.status.borrow_mut() = status;
}
pub fn get_record(&self) -> &DomRefCell<Option<ModuleObject>> {
&self.record
}
pub fn set_record(&self, record: ModuleObject) {
*self.record.borrow_mut() = Some(record);
}
pub fn get_error(&self) -> &DomRefCell<Option<ModuleError>> {
&self.error
}
pub fn set_error(&self, error: Option<ModuleError>) {
*self.error.borrow_mut() = error;
}
pub fn get_text(&self) -> &DomRefCell<DOMString> {
&self.text
}
pub fn set_text(&self, module_text: DOMString) {
*self.text.borrow_mut() = module_text;
}
pub fn get_parent_urls(&self) -> &DomRefCell<IndexSet<ServoUrl>> {
&self.parent_urls
}
pub fn insert_parent_url(&self, parent_url: ServoUrl) {
self.parent_urls.borrow_mut().insert(parent_url);
}
pub fn append_parent_urls(&self, parent_urls: IndexSet<ServoUrl>) {
self.parent_urls.borrow_mut().extend(parent_urls);
}
pub fn get_descendant_urls(&self) -> &DomRefCell<IndexSet<ServoUrl>> {
&self.descendant_urls
}
pub fn append_descendant_urls(&self, descendant_urls: IndexSet<ServoUrl>) {
self.descendant_urls.borrow_mut().extend(descendant_urls);
}
/// recursively checks if all of the transitive descendants are
/// in the FetchingDescendants or later status
fn recursive_check_descendants(
module_tree: &ModuleTree,
module_map: &HashMap<ServoUrl, Rc<ModuleTree>>,
discovered_urls: &mut HashSet<ServoUrl>,
) -> bool {
discovered_urls.insert(module_tree.url.clone());
let descendant_urls = module_tree.descendant_urls.borrow();
for descendant_module in descendant_urls
.iter()
.filter_map(|url| module_map.get(&url.clone()))
{
if discovered_urls.contains(&descendant_module.url) {
continue;
}
let descendant_status = descendant_module.get_status();
if descendant_status < ModuleStatus::FetchingDescendants {
return false;
}
let all_ready_descendants = ModuleTree::recursive_check_descendants(
&descendant_module,
module_map,
discovered_urls,
);
if !all_ready_descendants {
return false;
}
}
return true;
}
fn has_all_ready_descendants(&self, module_map: &HashMap<ServoUrl, Rc<ModuleTree>>) -> bool {
let mut discovered_urls = HashSet::new();
return ModuleTree::recursive_check_descendants(&self, module_map, &mut discovered_urls);
}
pub fn get_visited_urls(&self) -> &DomRefCell<HashSet<ServoUrl>> {
&self.visited_urls
}
pub fn append_handler(&self, owner: ModuleOwner, module_url: ServoUrl, is_top_level: bool) {
let promise = self.promise.borrow();
let resolve_this = owner.clone();
let reject_this = owner.clone();
let resolved_url = module_url.clone();
let rejected_url = module_url.clone();
let handler = PromiseNativeHandler::new(
&owner.global(),
Some(ModuleHandler::new(Box::new(
task!(fetched_resolve: move || {
resolve_this.finish_module_load(Some(resolved_url), is_top_level);
}),
))),
Some(ModuleHandler::new(Box::new(
task!(failure_reject: move || {
reject_this.finish_module_load(Some(rejected_url), is_top_level);
}),
))),
);
let _compartment = enter_realm(&*owner.global());
AlreadyInCompartment::assert(&*owner.global());
let _ais = AutoIncumbentScript::new(&*owner.global());
let promise = promise.as_ref().unwrap();
promise.append_native_handler(&handler);
}
}
#[derive(Clone, Copy, Debug, JSTraceable, PartialEq, PartialOrd)]
pub enum ModuleStatus {
Initial,
Fetching,
FetchingDescendants,
FetchFailed,
Ready,
Finished,
}
impl ModuleTree {
#[allow(unsafe_code)]
/// https://html.spec.whatwg.org/multipage/#creating-a-module-script
/// Step 7-11.
fn compile_module_script(
&self,
global: &GlobalScope,
module_script_text: DOMString,
url: ServoUrl,
) -> Result<ModuleObject, ModuleError> {
let module: Vec<u16> = module_script_text.encode_utf16().collect();
let url_cstr = ffi::CString::new(url.as_str().as_bytes()).unwrap();
let _ac = JSAutoRealm::new(*global.get_cx(), *global.reflector().get_jsobject());
let compile_options = CompileOptionsWrapper::new(*global.get_cx(), url_cstr.as_ptr(), 1);
rooted!(in(*global.get_cx()) let mut module_script = ptr::null_mut::<JSObject>());
let mut source = get_source_text(&module);
unsafe {
if !CompileModule(
*global.get_cx(),
compile_options.ptr,
&mut source,
&mut module_script.handle_mut(),
) {
warn!("fail to compile module script of {}", url);
rooted!(in(*global.get_cx()) let mut exception = UndefinedValue());
assert!(JS_GetPendingException(
*global.get_cx(),
&mut exception.handle_mut()
));
JS_ClearPendingException(*global.get_cx());
return Err(ModuleError::RawException(RootedTraceableBox::from_box(
Heap::boxed(exception.get()),
)));
}
let module_script_data = Box::new(ModuleScript {
base_url: url.clone(),
});
SetModulePrivate(
module_script.get(),
&PrivateValue(Box::into_raw(module_script_data) as *const _),
);
}
debug!("module script of {} compile done", url);
self.resolve_requested_module_specifiers(
&global,
module_script.handle().into_handle(),
url.clone(),
)
.map(|_| ModuleObject(Heap::boxed(*module_script)))
}
#[allow(unsafe_code)]
pub fn instantiate_module_tree(
&self,
global: &GlobalScope,
module_record: HandleObject,
) -> Result<(), ModuleError> {
let _ac = JSAutoRealm::new(*global.get_cx(), *global.reflector().get_jsobject());
unsafe {
if !ModuleInstantiate(*global.get_cx(), module_record) {
warn!("fail to instantiate module");
rooted!(in(*global.get_cx()) let mut exception = UndefinedValue());
assert!(JS_GetPendingException(
*global.get_cx(),
&mut exception.handle_mut()
));
JS_ClearPendingException(*global.get_cx());
Err(ModuleError::RawException(RootedTraceableBox::from_box(
Heap::boxed(exception.get()),
)))
} else {
debug!("module instantiated successfully");
Ok(())
}
}
}
#[allow(unsafe_code)]
pub fn execute_module(
&self,
global: &GlobalScope,
module_record: HandleObject,
) -> Result<(), ModuleError> {
let _ac = JSAutoRealm::new(*global.get_cx(), *global.reflector().get_jsobject());
unsafe {
if !ModuleEvaluate(*global.get_cx(), module_record) {
warn!("fail to evaluate module");
rooted!(in(*global.get_cx()) let mut exception = UndefinedValue());
assert!(JS_GetPendingException(
*global.get_cx(),
&mut exception.handle_mut()
));
JS_ClearPendingException(*global.get_cx());
Err(ModuleError::RawException(RootedTraceableBox::from_box(
Heap::boxed(exception.get()),
)))
} else {
debug!("module evaluated successfully");
Ok(())
}
}
}
#[allow(unsafe_code)]
pub fn report_error(&self, global: &GlobalScope) {
let module_error = self.error.borrow();
if let Some(exception) = &*module_error {
unsafe {
JS_SetPendingException(*global.get_cx(), exception.handle());
report_pending_exception(*global.get_cx(), true);
}
}
}
/// https://html.spec.whatwg.org/multipage/#fetch-the-descendants-of-a-module-script
/// Step 5.
pub fn resolve_requested_modules(
&self,
global: &GlobalScope,
) -> Result<IndexSet<ServoUrl>, ModuleError> {
let status = self.get_status();
assert_ne!(status, ModuleStatus::Initial);
assert_ne!(status, ModuleStatus::Fetching);
let record = self.record.borrow();
if let Some(raw_record) = &*record {
let valid_specifier_urls = self.resolve_requested_module_specifiers(
&global,
raw_record.handle(),
self.url.clone(),
);
return valid_specifier_urls.map(|parsed_urls| {
parsed_urls
.iter()
.filter_map(|parsed_url| {
let mut visited = self.visited_urls.borrow_mut();
if !visited.contains(&parsed_url) {
visited.insert(parsed_url.clone());
Some(parsed_url.clone())
} else {
None
}
})
.collect::<IndexSet<ServoUrl>>()
});
}
unreachable!("Didn't have record while resolving its requested module")
}
#[allow(unsafe_code)]
fn resolve_requested_module_specifiers(
&self,
global: &GlobalScope,
module_object: HandleObject,
base_url: ServoUrl,
) -> Result<IndexSet<ServoUrl>, ModuleError> {
let _ac = JSAutoRealm::new(*global.get_cx(), *global.reflector().get_jsobject());
let mut specifier_urls = IndexSet::new();
unsafe {
rooted!(in(*global.get_cx()) let requested_modules = GetRequestedModules(*global.get_cx(), module_object));
let mut length = 0;
if !JS_GetArrayLength(*global.get_cx(), requested_modules.handle(), &mut length) {
let module_length_error =
gen_type_error(&global, "Wrong length of requested modules".to_owned());
return Err(module_length_error);
}
for index in 0..length {
rooted!(in(*global.get_cx()) let mut element = UndefinedValue());
if !JS_GetElement(
*global.get_cx(),
requested_modules.handle(),
index,
&mut element.handle_mut(),
) {
let get_element_error =
gen_type_error(&global, "Failed to get requested module".to_owned());
return Err(get_element_error);
}
rooted!(in(*global.get_cx()) let specifier = GetRequestedModuleSpecifier(
*global.get_cx(), element.handle()
));
let url = ModuleTree::resolve_module_specifier(
*global.get_cx(),
&base_url,
specifier.handle().into_handle(),
);
if url.is_err() {
let specifier_error =
gen_type_error(&global, "Wrong module specifier".to_owned());
return Err(specifier_error);
}
specifier_urls.insert(url.unwrap());
}
}
Ok(specifier_urls)
}
/// The following module specifiers are allowed by the spec:
/// - a valid absolute URL
/// - a valid relative URL that starts with "/", "./" or "../"
///
/// Bareword module specifiers are currently disallowed as these may be given
/// special meanings in the future.
/// https://html.spec.whatwg.org/multipage/#resolve-a-module-specifier
#[allow(unsafe_code)]
fn resolve_module_specifier(
cx: *mut JSContext,
url: &ServoUrl,
specifier: RawHandle<*mut JSString>,
) -> Result<ServoUrl, UrlParseError> {
let specifier_str = unsafe { jsstring_to_str(cx, *specifier) };
// Step 1.
if let Ok(specifier_url) = ServoUrl::parse(&specifier_str) {
return Ok(specifier_url);
}
// Step 2.
if !specifier_str.starts_with("/") &&
!specifier_str.starts_with("./") &&
!specifier_str.starts_with("../")
{
return Err(UrlParseError::InvalidDomainCharacter);
}
// Step 3.
return ServoUrl::parse_with_base(Some(url), &specifier_str.clone());
}
/// https://html.spec.whatwg.org/multipage/#finding-the-first-parse-error
fn find_first_parse_error(
global: &GlobalScope,
module_tree: &ModuleTree,
discovered_urls: &mut HashSet<ServoUrl>,
) -> Option<ModuleError> {
// 3.
discovered_urls.insert(module_tree.url.clone());
// 4.
let module_map = global.get_module_map().borrow();
let record = module_tree.get_record().borrow();
if record.is_none() {
let module_error = module_tree.get_error().borrow();
return module_error.clone();
}
// 5-6.
let mut errors: Vec<ModuleError> = Vec::new();
let descendant_urls = module_tree.get_descendant_urls().borrow();
for descendant_module in descendant_urls
.iter()
// 7.
.filter_map(|url| module_map.get(&url.clone()))
{
// 8-2.
if discovered_urls.contains(&descendant_module.url) {
continue;
}
// 8-3.
let child_parse_error =
ModuleTree::find_first_parse_error(&global, &descendant_module, discovered_urls);
// 8-4.
if let Some(child_error) = child_parse_error {
errors.push(child_error);
}
}
// Step 9.
return errors.into_iter().max();
}
}
#[derive(JSTraceable, MallocSizeOf)]
struct ModuleHandler {
#[ignore_malloc_size_of = "Measuring trait objects is hard"]
task: DomRefCell<Option<Box<dyn TaskBox>>>,
}
impl ModuleHandler {
pub fn new(task: Box<dyn TaskBox>) -> Box<dyn Callback> {
Box::new(Self {
task: DomRefCell::new(Some(task)),
})
}
}
impl Callback for ModuleHandler {
fn callback(&self, _cx: *mut JSContext, _v: HandleValue) {
let task = self.task.borrow_mut().take().unwrap();
task.run_box();
}
}
/// The owner of the module
/// It can be `worker` or `script` element
#[derive(Clone)]
pub enum ModuleOwner {
#[allow(dead_code)]
Worker(TrustedWorkerAddress),
Window(Trusted<HTMLScriptElement>),
}
impl ModuleOwner {
pub fn global(&self) -> DomRoot<GlobalScope> {
match &self {
ModuleOwner::Worker(worker) => (*worker.root().clone()).global(),
ModuleOwner::Window(script) => (*script.root()).global(),
}
}
fn gen_promise_with_final_handler(
&self,
module_url: Option<ServoUrl>,
is_top_level: bool,
) -> Rc<Promise> {
let resolve_this = self.clone();
let reject_this = self.clone();
let resolved_url = module_url.clone();
let rejected_url = module_url.clone();
let handler = PromiseNativeHandler::new(
&self.global(),
Some(ModuleHandler::new(Box::new(
task!(fetched_resolve: move || {
resolve_this.finish_module_load(resolved_url, is_top_level);
}),
))),
Some(ModuleHandler::new(Box::new(
task!(failure_reject: move || {
reject_this.finish_module_load(rejected_url, is_top_level);
}),
))),
);
let compartment = enter_realm(&*self.global());
let comp = InCompartment::Entered(&compartment);
let _ais = AutoIncumbentScript::new(&*self.global());
let promise = Promise::new_in_current_compartment(&self.global(), comp);
promise.append_native_handler(&handler);
promise
}
/// https://html.spec.whatwg.org/multipage/#fetch-the-descendants-of-and-link-a-module-script
/// step 4-7.
pub fn finish_module_load(&self, module_url: Option<ServoUrl>, is_top_level: bool) {
match &self {
ModuleOwner::Worker(_) => unimplemented!(),
ModuleOwner::Window(script) => {
let global = self.global();
let document = document_from_node(&*script.root());
let module_map = global.get_module_map().borrow();
let (module_tree, mut load) = if let Some(script_src) = module_url.clone() {
let module_tree = module_map.get(&script_src.clone()).unwrap().clone();
let load = Ok(ScriptOrigin::external(
module_tree.get_text().borrow().clone(),
script_src.clone(),
ScriptType::Module,
));
debug!(
"Going to finish external script from {}",
script_src.clone()
);
(module_tree, load)
} else {
let module_tree = {
let inline_module_map = global.get_inline_module_map().borrow();
inline_module_map
.get(&script.root().get_script_id())
.unwrap()
.clone()
};
let base_url = document.base_url();
let load = Ok(ScriptOrigin::internal(
module_tree.get_text().borrow().clone(),
base_url.clone(),
ScriptType::Module,
));
debug!("Going to finish internal script from {}", base_url.clone());
(module_tree, load)
};
module_tree.set_status(ModuleStatus::Finished);
if !module_tree.has_all_ready_descendants(&module_map) {
return;
}
let parent_urls = module_tree.get_parent_urls().borrow();
let parent_all_ready = parent_urls
.iter()
.filter_map(|parent_url| module_map.get(&parent_url.clone()))
.all(|parent_tree| parent_tree.has_all_ready_descendants(&module_map));
if !parent_all_ready {
return;
}
parent_urls
.iter()
.filter_map(|parent_url| module_map.get(&parent_url.clone()))
.for_each(|parent_tree| {
let parent_promise = parent_tree.get_promise().borrow();
if let Some(promise) = parent_promise.as_ref() {
promise.resolve_native(&());
}
});
let mut discovered_urls: HashSet<ServoUrl> = HashSet::new();
let module_error =
ModuleTree::find_first_parse_error(&global, &module_tree, &mut discovered_urls);
match module_error {
None => {
let module_record = module_tree.get_record().borrow();
if let Some(record) = &*module_record {
let instantiated =
module_tree.instantiate_module_tree(&global, record.handle());
if let Err(exception) = instantiated {
module_tree.set_error(Some(exception.clone()));
}
}
},
Some(ModuleError::RawException(exception)) => {
module_tree.set_error(Some(ModuleError::RawException(exception)));
},
Some(ModuleError::Network(network_error)) => {
module_tree.set_error(Some(ModuleError::Network(network_error.clone())));
// Change the `result` load of the script into `network` error
load = Err(network_error);
},
};
if is_top_level {
let r#async = script
.root()
.upcast::<Element>()
.has_attribute(&local_name!("async"));
if !r#async && (&*script.root()).get_parser_inserted() {
document.deferred_script_loaded(&*script.root(), load);
} else if !r#async && !(&*script.root()).get_non_blocking() {
document.asap_in_order_script_loaded(&*script.root(), load);
} else {
document.asap_script_loaded(&*script.root(), load);
};
}
},
}
}
}
/// The context required for asynchronously loading an external module script source.
struct ModuleContext {
/// The owner of the module that initiated the request.
owner: ModuleOwner,
/// The response body received to date.
data: Vec<u8>,
/// The response metadata received to date.
metadata: Option<Metadata>,
/// The initial URL requested.
url: ServoUrl,
/// Destination of current module context
destination: Destination,
/// Credentials Mode of current module context
credentials_mode: CredentialsMode,
/// Indicates whether the request failed, and why
status: Result<(), NetworkError>,
/// Timing object for this resource
resource_timing: ResourceFetchTiming,
}
impl FetchResponseListener for ModuleContext {
fn process_request_body(&mut self) {} // TODO(cybai): Perhaps add custom steps to perform fetch here?
fn process_request_eof(&mut self) {} // TODO(cybai): Perhaps add custom steps to perform fetch here?
fn process_response(&mut self, metadata: Result<FetchMetadata, NetworkError>) {
self.metadata = metadata.ok().map(|meta| match meta {
FetchMetadata::Unfiltered(m) => m,
FetchMetadata::Filtered { unsafe_, .. } => unsafe_,
});
let status_code = self
.metadata
.as_ref()
.and_then(|m| match m.status {
Some((c, _)) => Some(c),
_ => None,
})
.unwrap_or(0);
self.status = match status_code {
0 => Err(NetworkError::Internal(
"No http status code received".to_owned(),
)),
200..=299 => Ok(()), // HTTP ok status codes
_ => Err(NetworkError::Internal(format!(
"HTTP error code {}",
status_code
))),
};
}
fn process_response_chunk(&mut self, mut chunk: Vec<u8>) {
if self.status.is_ok() {
self.data.append(&mut chunk);
}
}
/// <https://html.spec.whatwg.org/multipage/#fetch-a-single-module-script>
/// Step 9-12
#[allow(unsafe_code)]
fn process_response_eof(&mut self, response: Result<ResourceFetchTiming, NetworkError>) {
let global = self.owner.global();
if let Some(window) = global.downcast::<Window>() {
window
.Document()
.finish_load(LoadType::Script(self.url.clone()));
}
// Step 9-1 & 9-2.
let load = response.and(self.status.clone()).and_then(|_| {
// Step 9-3.
let meta = self.metadata.take().unwrap();
if let Some(content_type) = meta.content_type.map(Serde::into_inner) {
let c = content_type.to_string();
// The MIME crate includes params (e.g. charset=utf8) in the to_string
// https://github.com/hyperium/mime/issues/120
if let Some(ty) = c.split(';').next() {
if !SCRIPT_JS_MIMES.contains(&ty) {
return Err(NetworkError::Internal(format!("Invalid MIME type: {}", ty)));
}
} else {
return Err(NetworkError::Internal("Empty MIME type".into()));
}
} else {
return Err(NetworkError::Internal("No MIME type".into()));
}
// Step 10.
let (source_text, _, _) = UTF_8.decode(&self.data);
Ok(ScriptOrigin::external(
DOMString::from(source_text),
meta.final_url,
ScriptType::Module,
))
});
if let Err(err) = load {
// Step 9.
error!("Failed to fetch {} with error {:?}", self.url.clone(), err);
let module_tree = {
let module_map = global.get_module_map().borrow();
module_map.get(&self.url.clone()).unwrap().clone()
};
module_tree.set_status(ModuleStatus::FetchFailed);
module_tree.set_error(Some(ModuleError::Network(err)));
let promise = module_tree.get_promise().borrow();
promise.as_ref().unwrap().resolve_native(&());
return;
}
// Step 12.
if let Ok(ref resp_mod_script) = load {
let module_tree = {
let module_map = global.get_module_map().borrow();
module_map.get(&self.url.clone()).unwrap().clone()
};
module_tree.set_text(resp_mod_script.text());
let compiled_module = module_tree.compile_module_script(
&global,
resp_mod_script.text(),
self.url.clone(),
);
match compiled_module {
Err(exception) => {
module_tree.set_error(Some(exception));
let promise = module_tree.get_promise().borrow();
promise.as_ref().unwrap().resolve_native(&());
return;
},
Ok(record) => {