Darnell Andries
f3bea37356
* Create `SSEParser` util in `api_request_helper` namespace * Refactor `ObliviousHttpAPIClient` to use `SSEParser` * Address PR feedback
75 lines
2.0 KiB
C++
75 lines
2.0 KiB
C++
/* Copyright (c) 2026 The Brave Authors. All rights reserved.
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at https://mozilla.org/MPL/2.0/. */
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#include "brave/components/api_request_helper/sse_parser.h"
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#include <utility>
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#include "base/check.h"
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#include "base/trace_event/trace_event.h"
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#include "brave/components/api_request_helper/utils.h"
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namespace api_request_helper {
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namespace {
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constexpr std::string_view kDataPrefix = "data: {";
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} // namespace
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SSEParser::SSEParser(scoped_refptr<base::SequencedTaskRunner> task_runner,
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base::RepeatingCallback<void(ValueOrError)> on_event)
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: task_runner_(std::move(task_runner)), on_event_(std::move(on_event)) {}
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SSEParser::~SSEParser() = default;
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void SSEParser::Process(std::string_view chunk) {
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size_t pos;
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while ((pos = chunk.find_first_of("\r\n")) != std::string_view::npos) {
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auto line = chunk.substr(0, pos);
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if (!line_buffer_.empty()) {
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line_buffer_.append(line);
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line = line_buffer_;
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}
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ProcessLine(line);
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line_buffer_.clear();
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chunk.remove_prefix(pos + 1);
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}
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if (!chunk.empty()) {
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line_buffer_.append(chunk);
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}
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}
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void SSEParser::Clear() {
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line_buffer_.clear();
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}
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bool SSEParser::IsDecoding() const {
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return decoding_count_ > 0;
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}
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void SSEParser::ProcessLine(std::string_view line) {
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if (line.empty()) {
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return;
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}
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if (!line.starts_with(kDataPrefix)) {
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return;
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}
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auto json = line.substr(kDataPrefix.size() - 1);
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decoding_count_++;
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ParseJsonInWorkerTaskRunner(
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std::string(json), task_runner_.get(),
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base::BindOnce(&SSEParser::OnJsonParsed, weak_ptr_factory_.GetWeakPtr()));
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}
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void SSEParser::OnJsonParsed(ValueOrError result) {
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TRACE_EVENT0("brave", "APIRequestHelper_ParseSSECallback");
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CHECK_GT(decoding_count_, 0u);
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decoding_count_--;
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DCHECK(on_event_);
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on_event_.Run(std::move(result));
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}
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} // namespace api_request_helper
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