chromium/net/http/broken_alternative_services.h

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_HTTP_BROKEN_ALTERNATIVE_SERVICES_H_
#define NET_HTTP_BROKEN_ALTERNATIVE_SERVICES_H_

#include <list>
#include <set>

#include "base/containers/lru_cache.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "net/base/network_anonymization_key.h"
#include "net/http/alternative_service.h"

namespace base {
class TickClock;
}

namespace net {

// Contains information about a broken alternative service, and the context in
// which it's known to be broken.
struct NET_EXPORT_PRIVATE BrokenAlternativeService { … };

// Stores broken alternative services and when their brokenness expires.
BrokenAlternativeServiceList;

// Stores how many times an alternative service has been marked broken.
class RecentlyBrokenAlternativeServices
    : public base::LRUCache<BrokenAlternativeService, int> { … };

// This class tracks HTTP alternative services that have been marked as broken.
// The brokenness of an alt-svc will expire after some time according to an
// exponential back-off formula: each time an alt-svc is marked broken, the
// expiration delay will be some constant multiple of its previous expiration
// delay. This prevents broken alt-svcs from being retried too often by the
// network stack.
//
// Intended solely for use by HttpServerProperties.
class NET_EXPORT_PRIVATE BrokenAlternativeServices { … };

}  // namespace net

#endif  // NET_HTTP_BROKEN_ALTERNATIVE_SERVICES_H_