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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/script/module_map.h"
#include "third_party/blink/renderer/core/loader/modulescript/module_script_fetch_request.h"
#include "third_party/blink/renderer/core/loader/modulescript/module_script_loader.h"
#include "third_party/blink/renderer/core/loader/modulescript/module_script_loader_client.h"
#include "third_party/blink/renderer/core/loader/modulescript/module_script_loader_registry.h"
#include "third_party/blink/renderer/core/script/modulator.h"
#include "third_party/blink/renderer/core/script/module_script.h"
#include "third_party/blink/renderer/platform/bindings/name_client.h"
namespace blink {
// Entry struct represents a value in "module map" spec object.
// https://html.spec.whatwg.org/multipage/webappapis.html#module-map
class ModuleMap::Entry final : public GarbageCollectedFinalized<Entry>,
public NameClient,
public ModuleScriptLoaderClient {
USING_GARBAGE_COLLECTED_MIXIN(ModuleMap::Entry);
public:
static Entry* Create(ModuleMap* map) {
return MakeGarbageCollected<Entry>(map);
}
explicit Entry(ModuleMap*);
~Entry() override {}
void Trace(blink::Visitor*) override;
const char* NameInHeapSnapshot() const override { return "ModuleMap::Entry"; }
// Notify fetched |m_moduleScript| to the client asynchronously.
void AddClient(SingleModuleClient*);
// This is only to be used from ScriptModuleResolver implementations.
ModuleScript* GetModuleScript() const;
private:
void DispatchFinishedNotificationAsync(SingleModuleClient*);
// Implements ModuleScriptLoaderClient
void NotifyNewSingleModuleFinished(ModuleScript*) override;
TraceWrapperMember<ModuleScript> module_script_;
Member<ModuleMap> map_;
// Correspond to the HTML spec: "fetching" state.
bool is_fetching_ = true;
HeapHashSet<Member<SingleModuleClient>> clients_;
};
ModuleMap::Entry::Entry(ModuleMap* map) : map_(map) {
DCHECK(map_);
}
void ModuleMap::Entry::Trace(blink::Visitor* visitor) {
visitor->Trace(module_script_);
visitor->Trace(map_);
visitor->Trace(clients_);
}
void ModuleMap::Entry::DispatchFinishedNotificationAsync(
SingleModuleClient* client) {
map_->GetModulator()->TaskRunner()->PostTask(
FROM_HERE,
WTF::Bind(&SingleModuleClient::NotifyModuleLoadFinished,
WrapPersistent(client), WrapPersistent(module_script_.Get())));
}
void ModuleMap::Entry::AddClient(SingleModuleClient* new_client) {
DCHECK(!clients_.Contains(new_client));
if (!is_fetching_) {
DCHECK(clients_.IsEmpty());
DispatchFinishedNotificationAsync(new_client);
return;
}
clients_.insert(new_client);
}
void ModuleMap::Entry::NotifyNewSingleModuleFinished(
ModuleScript* module_script) {
CHECK(is_fetching_);
module_script_ = module_script;
is_fetching_ = false;
for (const auto& client : clients_) {
DispatchFinishedNotificationAsync(client);
}
clients_.clear();
}
ModuleScript* ModuleMap::Entry::GetModuleScript() const {
return module_script_.Get();
}
ModuleMap::ModuleMap(Modulator* modulator)
: modulator_(modulator),
loader_registry_(ModuleScriptLoaderRegistry::Create()) {
DCHECK(modulator);
}
void ModuleMap::Trace(blink::Visitor* visitor) {
visitor->Trace(map_);
visitor->Trace(modulator_);
visitor->Trace(loader_registry_);
}
// <specdef href="https://html.spec.whatwg.org/#fetch-a-single-module-script">
void ModuleMap::FetchSingleModuleScript(
const ModuleScriptFetchRequest& request,
FetchClientSettingsObjectSnapshot* fetch_client_settings_object,
ModuleGraphLevel level,
ModuleScriptCustomFetchType custom_fetch_type,
SingleModuleClient* client) {
// <spec step="1">Let moduleMap be module map settings object's module
// map.</spec>
//
// Note: |this| is the ModuleMap.
// <spec step="2">If moduleMap[url] is "fetching", wait in parallel until that
// entry's value changes, then queue a task on the networking task source to
// proceed with running the following steps.</spec>
MapImpl::AddResult result = map_.insert(request.Url(), nullptr);
TraceWrapperMember<Entry>& entry = result.stored_value->value;
if (result.is_new_entry) {
entry = Entry::Create(this);
// Steps 4-9 loads a new single module script.
// Delegates to ModuleScriptLoader via Modulator.
ModuleScriptLoader::Fetch(request, fetch_client_settings_object, level,
modulator_, custom_fetch_type, loader_registry_,
entry);
}
DCHECK(entry);
// <spec step="3">If moduleMap[url] exists, asynchronously complete this
// algorithm with moduleMap[url], and abort these steps.</spec>
//
// <spec step="12">Set moduleMap[url] to module script, and asynchronously
// complete this algorithm with module script.</spec>
if (client)
entry->AddClient(client);
}
ModuleScript* ModuleMap::GetFetchedModuleScript(const KURL& url) const {
MapImpl::const_iterator it = map_.find(url);
if (it == map_.end())
return nullptr;
return it->value->GetModuleScript();
}
} // namespace blink
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