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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_LOADER_KEEP_ALIVE_REQUEST_TRACKER_H_
#define CHROME_BROWSER_LOADER_KEEP_ALIVE_REQUEST_TRACKER_H_
#include <memory>
#include <optional>
#include <string>
#include "base/functional/callback.h"
#include "base/time/time.h"
#include "content/public/browser/keep_alive_request_tracker.h"
#include "services/metrics/public/cpp/ukm_builders.h"
#include "services/metrics/public/cpp/ukm_source_id.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/cpp/url_loader_completion_status.h"
// ChromeKeepAliveRequestTracker is responsible for recording browser-side
// metrics for an eligible fetch keepalive request.
//
// The UKM event logging happens only once when this tracker is about to be
// destroyed.
//
// See
// https://docs.google.com/document/d/1byKFqqKTsVFnj6rSb7ZjHi4LuRi1LNb-vf4maQbmSSQ/edit?resourcekey=0-7GAe1ae8j_55DMcvp3U3IQ&tab=t.0#heading=h.bk553qrz82t0
class ChromeKeepAliveRequestTracker : public content::KeepAliveRequestTracker {
public:
~ChromeKeepAliveRequestTracker() override;
// Returns a tracker instance if `request` is eligible to be tracked.
//
// `ukm_source_id` is the UKM ID to associate with the events logged by the
// returned tracker.
// `is_context_detached_callback` tells if the context of `request` is
// detached at the time running the callback.
static std::unique_ptr<ChromeKeepAliveRequestTracker>
MaybeCreateKeepAliveRequestTracker(
const network::ResourceRequest& request,
std::optional<ukm::SourceId> ukm_source_id,
IsContextDetachedCallback is_context_detached_callback);
private:
ChromeKeepAliveRequestTracker(
RequestType request_type,
uint32_t request_category,
ukm::SourceId ukm_source_id,
IsContextDetachedCallback is_context_detached_callback,
base::UnguessableToken keepalive_token);
void AddStageMetrics(const RequestStage& stage) override;
// Logs a UKM event for the tracked request.
void LogUkmEvent();
// Records the time when this tracker is created.
const base::TimeTicks created_time_;
// The UKM builder for the tracked request.
ukm::builders::FetchKeepAliveRequest_WithCategory ukm_builder_;
// A callback to tell if the context of the request is detached.
IsContextDetachedCallback is_context_detached_callback_;
};
#endif // CHROME_BROWSER_LOADER_KEEP_ALIVE_REQUEST_TRACKER_H_
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