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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ai/ai_writer.h"
#include "base/functional/bind.h"
#include "base/strings/strcat.h"
#include "chrome/browser/ai/ai_context_bound_object.h"
#include "chrome/browser/ai/ai_utils.h"
#include "components/optimization_guide/core/optimization_guide_util.h"
#include "components/optimization_guide/proto/common_types.pb.h"
#include "third_party/blink/public/mojom/ai/model_streaming_responder.mojom.h"
namespace {
optimization_guide::proto::WritingAssistanceApiOutputTone ToProtoTone(
blink::mojom::AIWriterTone type) {
switch (type) {
case blink::mojom::AIWriterTone::kFormal:
return optimization_guide::proto::
WRITING_ASSISTANCE_API_OUTPUT_TONE_FORMAL;
case blink::mojom::AIWriterTone::kNeutral:
return optimization_guide::proto::
WRITING_ASSISTANCE_API_OUTPUT_TONE_NEUTRAL;
case blink::mojom::AIWriterTone::kCasual:
return optimization_guide::proto::
WRITING_ASSISTANCE_API_OUTPUT_TONE_CASUAL;
}
}
optimization_guide::proto::WritingAssistanceApiOutputFormat ToProtoFormat(
blink::mojom::AIWriterFormat format) {
switch (format) {
case blink::mojom::AIWriterFormat::kPlainText:
return optimization_guide::proto::
WRITING_ASSISTANCE_API_OUTPUT_FORMAT_PLAIN_TEXT;
case blink::mojom::AIWriterFormat::kMarkdown:
return optimization_guide::proto::
WRITING_ASSISTANCE_API_OUTPUT_FORMAT_MARKDOWN;
}
}
optimization_guide::proto::WritingAssistanceApiOutputLength ToProtoLength(
blink::mojom::AIWriterLength length) {
switch (length) {
case blink::mojom::AIWriterLength::kShort:
return optimization_guide::proto::
WRITING_ASSISTANCE_API_OUTPUT_LENGTH_SHORT;
case blink::mojom::AIWriterLength::kMedium:
return optimization_guide::proto::
WRITING_ASSISTANCE_API_OUTPUT_LENGTH_MEDIUM;
case blink::mojom::AIWriterLength::kLong:
return optimization_guide::proto::
WRITING_ASSISTANCE_API_OUTPUT_LENGTH_LONG;
}
}
} // namespace
AIWriter::AIWriter(
AIContextBoundObjectSet& context_bound_object_set,
std::unique_ptr<optimization_guide::OptimizationGuideModelExecutor::Session>
session,
blink::mojom::AIWriterCreateOptionsPtr options,
mojo::PendingReceiver<blink::mojom::AIWriter> receiver)
: AIContextBoundObject(context_bound_object_set),
session_wrapper_(std::move(session)),
options_(std::move(options)),
receiver_(this, std::move(receiver)) {
receiver_.set_disconnect_handler(base::BindOnce(
&AIContextBoundObject::RemoveFromSet, base::Unretained(this)));
}
AIWriter::~AIWriter() {
for (auto& responder : responder_set_) {
AIUtils::SendStreamingStatus(
responder,
blink::mojom::ModelStreamingResponseStatus::kErrorSessionDestroyed);
}
}
// static
std::unique_ptr<optimization_guide::proto::WritingAssistanceApiOptions>
AIWriter::ToProtoOptions(
const blink::mojom::AIWriterCreateOptionsPtr& options) {
auto proto_options = std::make_unique<
optimization_guide::proto::WritingAssistanceApiOptions>();
proto_options->set_output_tone(ToProtoTone(options->tone));
proto_options->set_output_format(ToProtoFormat(options->format));
proto_options->set_output_length(ToProtoLength(options->length));
return proto_options;
}
void AIWriter::Write(const std::string& input,
const std::optional<std::string>& context,
mojo::PendingRemote<blink::mojom::ModelStreamingResponder>
pending_responder) {
auto request = BuildRequest(input, context.value_or(std::string()));
mojo::RemoteSetElementId responder_id =
responder_set_.Add(std::move(pending_responder));
session_wrapper_.session()->GetExecutionInputSizeInTokens(
optimization_guide::MultimodalMessageReadView(request),
base::BindOnce(&AIWriter::DidGetExecutionInputSizeForWrite,
weak_ptr_factory_.GetWeakPtr(), responder_id, request));
}
void AIWriter::DidGetExecutionInputSizeForWrite(
mojo::RemoteSetElementId responder_id,
const optimization_guide::proto::WritingAssistanceApiRequest& request,
std::optional<uint32_t> result) {
blink::mojom::ModelStreamingResponder* responder =
responder_set_.Get(responder_id);
if (!responder) {
// It might be possible for the responder mojo connection to be closed
// before this callback is invoked, in this case, we can't do anything.
return;
}
if (!session_wrapper_.session()) {
AIUtils::SendStreamingStatus(
responder,
blink::mojom::ModelStreamingResponseStatus::kErrorSessionDestroyed);
return;
}
if (!result.has_value()) {
AIUtils::SendStreamingStatus(
responder,
blink::mojom::ModelStreamingResponseStatus::kErrorGenericFailure);
return;
}
uint32_t quota = blink::mojom::kWritingAssistanceMaxInputTokenSize;
if (result.value() > quota) {
AIUtils::SendStreamingStatus(
responder,
blink::mojom::ModelStreamingResponseStatus::kErrorInputTooLarge,
blink::mojom::QuotaErrorInfo::New(result.value(), quota));
return;
}
session_wrapper_.ExecuteModelOrQueue(
optimization_guide::MultimodalMessage(request),
base::BindRepeating(&AIWriter::ModelExecutionCallback,
weak_ptr_factory_.GetWeakPtr(), responder_id));
}
void AIWriter::ModelExecutionCallback(
mojo::RemoteSetElementId responder_id,
optimization_guide::OptimizationGuideModelStreamingExecutionResult result) {
blink::mojom::ModelStreamingResponder* responder =
responder_set_.Get(responder_id);
if (!responder) {
return;
}
if (!result.response.has_value()) {
AIUtils::SendStreamingStatus(
responder,
AIUtils::ConvertModelExecutionError(result.response.error().error()));
return;
}
auto response = optimization_guide::ParsedAnyMetadata<
optimization_guide::proto::WritingAssistanceApiResponse>(
result.response->response);
if (response) {
responder->OnStreaming(response->output());
}
if (result.response->is_complete) {
responder->OnCompletion(/*context_info=*/nullptr);
responder_set_.Remove(responder_id);
}
}
void AIWriter::MeasureUsage(const std::string& input,
const std::string& context,
MeasureUsageCallback callback) {
auto* session = session_wrapper_.session();
if (!session) {
std::move(callback).Run(std::nullopt);
return;
}
auto request = BuildRequest(input, context);
session->GetExecutionInputSizeInTokens(
optimization_guide::MultimodalMessageReadView(request),
base::BindOnce(&AIWriter::DidGetExecutionInputSizeInTokensForMeasure,
weak_ptr_factory_.GetWeakPtr(), std::move(callback)));
}
void AIWriter::SetPriority(on_device_model::mojom::Priority priority) {
auto* session = session_wrapper_.session();
if (session) {
session->SetPriority(priority);
}
}
void AIWriter::DidGetExecutionInputSizeInTokensForMeasure(
MeasureUsageCallback callback,
std::optional<uint32_t> result) {
if (!result.has_value()) {
std::move(callback).Run(std::nullopt);
return;
}
std::move(callback).Run(result.value());
}
optimization_guide::proto::WritingAssistanceApiRequest AIWriter::BuildRequest(
const std::string& input,
const std::string& context) {
optimization_guide::proto::WritingAssistanceApiRequest request;
request.set_context(context);
request.set_allocated_options(ToProtoOptions(options_).release());
request.set_instructions(input);
// TODO(crbug.com/390006887): Pass shared context with session creation.
request.set_shared_context(options_->shared_context.value_or(std::string()));
return request;
}
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