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src: add
node_modules.h for module loader
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,173 @@ | ||
| #include "node_modules.h" | ||
| #include "base_object-inl.h" | ||
| #include "node_errors.h" | ||
| #include "node_external_reference.h" | ||
| #include "util-inl.h" | ||
| #include "v8-fast-api-calls.h" | ||
| #include "v8.h" | ||
|
|
||
| namespace node { | ||
| namespace modules { | ||
|
|
||
| using v8::CFunction; | ||
| using v8::Context; | ||
| using v8::FastOneByteString; | ||
| using v8::FunctionCallbackInfo; | ||
| using v8::HandleScope; | ||
| using v8::Isolate; | ||
| using v8::Local; | ||
| using v8::MaybeLocal; | ||
| using v8::NewStringType; | ||
| using v8::Object; | ||
| using v8::ObjectTemplate; | ||
| using v8::String; | ||
| using v8::Value; | ||
|
|
||
| void BindingData::MemoryInfo(MemoryTracker* tracker) const { | ||
| tracker->TrackField("package_json_files", package_json_files_); | ||
| } | ||
|
|
||
| BindingData::BindingData(Realm* realm, v8::Local<v8::Object> object) | ||
| : SnapshotableObject(realm, object, type_int) { | ||
| package_json_files_ = | ||
| v8::Global<v8::Map>(realm->isolate(), v8::Map::New(realm->isolate())); | ||
| object | ||
| ->Set(realm->context(), | ||
| FIXED_ONE_BYTE_STRING(realm->isolate(), "packageJsonFiles"), | ||
| package_json_files_.Get(realm->isolate())) | ||
| .Check(); | ||
|
|
||
| package_json_files_.SetWeak(); | ||
| } | ||
|
|
||
| bool BindingData::PrepareForSerialization(v8::Local<v8::Context> context, | ||
| v8::SnapshotCreator* creator) { | ||
| package_json_files_.Reset(); | ||
| // Return true because we need to maintain the reference to the binding from | ||
| // JS land. | ||
| return true; | ||
| } | ||
|
|
||
| InternalFieldInfoBase* BindingData::Serialize(int index) { | ||
| DCHECK_IS_SNAPSHOT_SLOT(index); | ||
| InternalFieldInfo* info = | ||
| InternalFieldInfoBase::New<InternalFieldInfo>(type()); | ||
| return info; | ||
| } | ||
|
|
||
| void BindingData::Deserialize(v8::Local<v8::Context> context, | ||
| v8::Local<v8::Object> holder, | ||
| int index, | ||
| InternalFieldInfoBase* info) { | ||
| DCHECK_IS_SNAPSHOT_SLOT(index); | ||
| v8::HandleScope scope(context->GetIsolate()); | ||
| Realm* realm = Realm::GetCurrent(context); | ||
| BindingData* binding = realm->AddBindingData<BindingData>(holder); | ||
| CHECK_NOT_NULL(binding); | ||
| } | ||
|
|
||
| void BindingData::ReadPackageJSON(const FunctionCallbackInfo<Value>& args) { | ||
| CHECK_GE(args.Length(), 1); | ||
| CHECK(args[0]->IsString()); | ||
|
|
||
| Realm* realm = Realm::GetCurrent(args); | ||
| auto isolate = realm->isolate(); | ||
| auto env = realm->env(); | ||
| auto context = realm->context(); | ||
| auto binding_data = realm->GetBindingData<BindingData>(); | ||
| auto package_json_files_ = binding_data->package_json_files_.Get(isolate); | ||
|
|
||
| Utf8Value path(isolate, args[0]); | ||
| THROW_IF_INSUFFICIENT_PERMISSIONS( | ||
| env, permission::PermissionScope::kFileSystemRead, path.ToStringView()); | ||
|
|
||
| if (strlen(*path) != path.length()) { | ||
| return; // Contains a nul byte. | ||
| } | ||
|
|
||
| Local<Value> cache_key = | ||
| ToV8Value(context, path.ToStringView(), isolate).ToLocalChecked(); | ||
| MaybeLocal<Value> maybe_existing = | ||
| package_json_files_->Get(context, cache_key); | ||
| Local<Value> existing_value; | ||
| if (maybe_existing.ToLocal(&existing_value) && existing_value->IsString()) { | ||
| return args.GetReturnValue().Set(existing_value); | ||
| } | ||
|
|
||
| uv_fs_t open_req; | ||
| const int fd = uv_fs_open(nullptr, &open_req, *path, O_RDONLY, 0, nullptr); | ||
| uv_fs_req_cleanup(&open_req); | ||
|
|
||
| if (fd < 0) { | ||
| return; | ||
| } | ||
|
|
||
| auto defer_close = OnScopeLeave([fd]() { | ||
| uv_fs_t close_req; | ||
| CHECK_EQ(0, uv_fs_close(nullptr, &close_req, fd, nullptr)); | ||
| uv_fs_req_cleanup(&close_req); | ||
| }); | ||
|
|
||
| const size_t kBlockSize = 32 << 10; | ||
| std::vector<char> chars; | ||
| int64_t offset = 0; | ||
| ssize_t numchars; | ||
| do { | ||
| const size_t start = chars.size(); | ||
| chars.resize(start + kBlockSize); | ||
|
|
||
| uv_buf_t buf; | ||
| buf.base = &chars[start]; | ||
| buf.len = kBlockSize; | ||
|
|
||
| uv_fs_t read_req; | ||
| numchars = uv_fs_read(nullptr, &read_req, fd, &buf, 1, offset, nullptr); | ||
| uv_fs_req_cleanup(&read_req); | ||
|
|
||
| if (numchars < 0) { | ||
| return; | ||
| } | ||
| offset += numchars; | ||
| } while (static_cast<size_t>(numchars) == kBlockSize); | ||
|
|
||
| size_t start = 0; | ||
| if (offset >= 3 && 0 == memcmp(chars.data(), "\xEF\xBB\xBF", 3)) { | ||
| start = 3; // Skip UTF-8 BOM. | ||
| } | ||
|
|
||
| auto content = | ||
| ToV8Value( | ||
| context, std::string_view(&chars[start], offset - start), isolate) | ||
| .ToLocalChecked(); | ||
| USE(package_json_files_->Set(context, cache_key, content)); | ||
| args.GetReturnValue().Set(content); | ||
| } | ||
|
|
||
| void BindingData::CreatePerIsolateProperties(IsolateData* isolate_data, | ||
| Local<ObjectTemplate> target) { | ||
| Isolate* isolate = isolate_data->isolate(); | ||
| SetMethod(isolate, target, "readPackageJSON", ReadPackageJSON); | ||
| } | ||
|
|
||
| void BindingData::CreatePerContextProperties(Local<Object> target, | ||
| Local<Value> unused, | ||
| Local<Context> context, | ||
| void* priv) { | ||
| Realm* realm = Realm::GetCurrent(context); | ||
| realm->AddBindingData<BindingData>(target); | ||
| } | ||
|
|
||
| void BindingData::RegisterExternalReferences( | ||
| ExternalReferenceRegistry* registry) { | ||
| registry->Register(ReadPackageJSON); | ||
| } | ||
|
|
||
| } // namespace modules | ||
| } // namespace node | ||
|
|
||
| NODE_BINDING_CONTEXT_AWARE_INTERNAL( | ||
| modules, node::modules::BindingData::CreatePerContextProperties) | ||
| NODE_BINDING_PER_ISOLATE_INIT( | ||
| modules, node::modules::BindingData::CreatePerIsolateProperties) | ||
| NODE_BINDING_EXTERNAL_REFERENCE( | ||
| modules, node::modules::BindingData::RegisterExternalReferences) |
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