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// Copyright 2022 The Chromium Authors
// 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/modules/ml/ml.h"
#include "services/webnn/public/cpp/webnn_trace.h"
#include "services/webnn/public/mojom/webnn_context_provider.mojom-blink-forward.h"
#include "third_party/blink/public/platform/browser_interface_broker_proxy.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_ml_context_options.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_ml_device_type.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_ml_power_preference.h"
#include "third_party/blink/renderer/modules/ml/ml_context.h"
#include "third_party/blink/renderer/modules/ml/webnn/ml_error.h"
#include "third_party/blink/renderer/platform/bindings/exception_code.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/heap/persistent.h"
namespace blink {
namespace {
webnn::mojom::blink::Device ConvertBlinkDeviceTypeToMojo(
const V8MLDeviceType& device_type_blink) {
switch (device_type_blink.AsEnum()) {
case V8MLDeviceType::Enum::kCpu:
return webnn::mojom::blink::Device::kCpu;
case V8MLDeviceType::Enum::kGpu:
return webnn::mojom::blink::Device::kGpu;
case V8MLDeviceType::Enum::kNpu:
return webnn::mojom::blink::Device::kNpu;
}
}
webnn::mojom::blink::CreateContextOptions::PowerPreference
ConvertBlinkPowerPreferenceToMojo(
const V8MLPowerPreference& power_preference_blink) {
switch (power_preference_blink.AsEnum()) {
case V8MLPowerPreference::Enum::kDefault:
return webnn::mojom::blink::CreateContextOptions::PowerPreference::
kDefault;
case V8MLPowerPreference::Enum::kLowPower:
return webnn::mojom::blink::CreateContextOptions::PowerPreference::
kLowPower;
case V8MLPowerPreference::Enum::kHighPerformance:
return webnn::mojom::blink::CreateContextOptions::PowerPreference::
kHighPerformance;
}
}
} // namespace
ML::ML(ExecutionContext* execution_context)
: ExecutionContextClient(execution_context),
webnn_context_provider_(execution_context) {}
void ML::Trace(Visitor* visitor) const {
visitor->Trace(webnn_context_provider_);
visitor->Trace(pending_resolvers_);
ExecutionContextClient::Trace(visitor);
ScriptWrappable::Trace(visitor);
}
ScriptPromise<MLContext> ML::createContext(ScriptState* script_state,
MLContextOptions* options,
ExceptionState& exception_state) {
webnn::ScopedTrace scoped_trace("ML::createContext(MLContextOptions)");
if (!script_state->ContextIsValid()) {
exception_state.ThrowDOMException(DOMExceptionCode::kInvalidStateError,
"Invalid script state");
return EmptyPromise();
}
auto* resolver = MakeGarbageCollected<ScriptPromiseResolver<MLContext>>(
script_state, exception_state.GetContext());
auto promise = resolver->Promise();
// Ensure `resolver` is rejected if the `CreateWebNNContext()` callback isn't
// run due to a WebNN service connection error.
pending_resolvers_.insert(resolver);
EnsureWebNNServiceConnection();
webnn_context_provider_->CreateWebNNContext(
webnn::mojom::blink::CreateContextOptions::New(
ConvertBlinkDeviceTypeToMojo(options->deviceType()),
ConvertBlinkPowerPreferenceToMojo(options->powerPreference())),
WTF::BindOnce(
[](ML* ml, ScriptPromiseResolver<MLContext>* resolver,
MLContextOptions* options, webnn::ScopedTrace scoped_trace,
webnn::mojom::blink::CreateContextResultPtr result) {
ml->pending_resolvers_.erase(resolver);
ExecutionContext* context = resolver->GetExecutionContext();
if (!context) {
return;
}
if (result->is_error()) {
const webnn::mojom::blink::Error& create_context_error =
*result->get_error();
resolver->RejectWithDOMException(
WebNNErrorCodeToDOMExceptionCode(create_context_error.code),
create_context_error.message);
return;
}
resolver->Resolve(MakeGarbageCollected<MLContext>(
context, options->deviceType(), options->powerPreference(),
std::move(result->get_success())));
},
WrapPersistent(this), WrapPersistent(resolver),
WrapPersistent(options), std::move(scoped_trace)));
return promise;
}
void ML::OnWebNNServiceConnectionError() {
webnn_context_provider_.reset();
for (const auto& resolver : pending_resolvers_) {
resolver->RejectWithDOMException(DOMExceptionCode::kUnknownError,
"WebNN service connection error.");
}
pending_resolvers_.clear();
}
ScriptPromise<MLContext> ML::createContext(ScriptState* script_state,
GPUDevice* gpu_device,
ExceptionState& exception_state) {
webnn::ScopedTrace scoped_trace("ML::createContext(GPUDevice)");
exception_state.ThrowDOMException(
DOMExceptionCode::kNotSupportedError,
"ML.createContext(GPUDevice) is not supported.");
return EmptyPromise();
}
void ML::EnsureWebNNServiceConnection() {
if (webnn_context_provider_.is_bound()) {
return;
}
GetExecutionContext()->GetBrowserInterfaceBroker().GetInterface(
webnn_context_provider_.BindNewPipeAndPassReceiver(
GetExecutionContext()->GetTaskRunner(TaskType::kMachineLearning)));
// Bind should always succeed because ml.idl is gated on the same feature flag
// as `WebNNContextProvider`.
CHECK(webnn_context_provider_.is_bound());
webnn_context_provider_.set_disconnect_handler(WTF::BindOnce(
&ML::OnWebNNServiceConnectionError, WrapWeakPersistent(this)));
}
} // namespace blink
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