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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_REPORTING_REPORTING_ENDPOINT_MANAGER_H_
#define NET_REPORTING_REPORTING_ENDPOINT_MANAGER_H_
#include <memory>
#include "net/base/net_export.h"
#include "net/base/rand_callback.h"
#include "net/reporting/reporting_endpoint.h"
class GURL;
namespace base {
class TickClock;
}
namespace net {
class NetworkIsolationKey;
class ReportingCache;
class ReportingDelegate;
struct ReportingEndpoint;
struct ReportingPolicy;
// Keeps track of which endpoints are pending (have active delivery attempts to
// them) or in exponential backoff after one or more failures, and chooses an
// endpoint from an endpoint group to receive reports for an origin.
class NET_EXPORT ReportingEndpointManager {
public:
// Maximum size of the backoff cache. This is deliberately much larger than is
// likely necessary - the only goal is to prevent it from growing without
// bound, while preventing repeatedly trying to upload data to down servrs.
// Public for tests.
static constexpr int kMaxEndpointBackoffCacheSize = 200;
// The ReportingEndpointManager must not be used after any of the objects
// passed to its constructor are destroyed.
static std::unique_ptr<ReportingEndpointManager> Create(
const ReportingPolicy* policy,
const base::TickClock* tick_clock,
const ReportingDelegate* delegate,
ReportingCache* cache,
const RandIntCallback& rand_callback);
virtual ~ReportingEndpointManager();
// Finds an endpoint that applies to deliveries to the group identified by
// |group_key| that are not expired or in exponential backoff from failed
// requests. The returned endpoint may have been configured by a superdomain
// of the group's origin. Deliberately chooses an endpoint randomly to ensure
// sites aren't relying on any sort of fallback ordering. If no suitable
// endpoint was found, returns an endpoint with is_valid() false.
virtual const ReportingEndpoint FindEndpointForDelivery(
const ReportingEndpointGroupKey& group_key) = 0;
// Informs the EndpointManager of a successful or unsuccessful request made to
// |endpoint| so it can manage exponential backoff of failing endpoints.
virtual void InformOfEndpointRequest(
const NetworkIsolationKey& network_isolation_key,
const GURL& endpoint,
bool succeeded) = 0;
};
} // namespace net
#endif // NET_REPORTING_REPORTING_ENDPOINT_MANAGER_H_
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