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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.
#include "net/reporting/reporting_endpoint_manager.h"
#include <map>
#include <set>
#include <string>
#include <utility>
#include <vector>
#include "base/containers/mru_cache.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/rand_util.h"
#include "base/stl_util.h"
#include "base/time/tick_clock.h"
#include "net/base/backoff_entry.h"
#include "net/base/network_isolation_key.h"
#include "net/base/rand_callback.h"
#include "net/reporting/reporting_cache.h"
#include "net/reporting/reporting_delegate.h"
#include "net/reporting/reporting_endpoint.h"
#include "net/reporting/reporting_policy.h"
#include "url/gurl.h"
#include "url/origin.h"
namespace net {
namespace {
class ReportingEndpointManagerImpl : public ReportingEndpointManager {
public:
ReportingEndpointManagerImpl(const ReportingPolicy* policy,
const base::TickClock* tick_clock,
const ReportingDelegate* delegate,
ReportingCache* cache,
const RandIntCallback& rand_callback)
: policy_(policy),
tick_clock_(tick_clock),
delegate_(delegate),
cache_(cache),
rand_callback_(rand_callback),
endpoint_backoff_(kMaxEndpointBackoffCacheSize) {
DCHECK(policy);
DCHECK(tick_clock);
DCHECK(delegate);
DCHECK(cache);
}
~ReportingEndpointManagerImpl() override = default;
const ReportingEndpoint FindEndpointForDelivery(
const ReportingEndpointGroupKey& group_key) override {
// Get unexpired endpoints that apply to a delivery to |origin| and |group|.
// May have been configured by a superdomain of |origin|.
std::vector<ReportingEndpoint> endpoints =
cache_->GetCandidateEndpointsForDelivery(group_key);
// Highest-priority endpoint(s) that are not expired, failing, or
// forbidden for use by the ReportingDelegate.
std::vector<ReportingEndpoint> available_endpoints;
// Total weight of endpoints in |available_endpoints|.
int total_weight = 0;
for (const ReportingEndpoint& endpoint : endpoints) {
if (!delegate_->CanUseClient(endpoint.group_key.origin,
endpoint.info.url)) {
continue;
}
// If this client is lower priority than the ones we've found, skip it.
if (!available_endpoints.empty() &&
endpoint.info.priority > available_endpoints[0].info.priority) {
continue;
}
// This brings each match to the front of the MRU cache, so if an entry
// frequently matches requests, it's more likely to stay in the cache.
auto endpoint_backoff_it = endpoint_backoff_.Get(EndpointBackoffKey(
group_key.network_isolation_key, endpoint.info.url));
if (endpoint_backoff_it != endpoint_backoff_.end() &&
endpoint_backoff_it->second->ShouldRejectRequest()) {
continue;
}
// If this client is higher priority than the ones we've found (or we
// haven't found any), forget about those ones and remember this one.
if (available_endpoints.empty() ||
endpoint.info.priority < available_endpoints[0].info.priority) {
available_endpoints.clear();
total_weight = 0;
}
available_endpoints.push_back(endpoint);
total_weight += endpoint.info.weight;
}
if (available_endpoints.empty()) {
return ReportingEndpoint();
}
if (total_weight == 0) {
int random_index = rand_callback_.Run(0, available_endpoints.size() - 1);
return available_endpoints[random_index];
}
int random_index = rand_callback_.Run(0, total_weight - 1);
int weight_so_far = 0;
for (size_t i = 0; i < available_endpoints.size(); ++i) {
const ReportingEndpoint& endpoint = available_endpoints[i];
weight_so_far += endpoint.info.weight;
if (random_index < weight_so_far) {
return endpoint;
}
}
// TODO(juliatuttle): Can we reach this in some weird overflow case?
NOTREACHED();
return ReportingEndpoint();
}
void InformOfEndpointRequest(const NetworkIsolationKey& network_isolation_key,
const GURL& endpoint,
bool succeeded) override {
EndpointBackoffKey endpoint_backoff_key(network_isolation_key, endpoint);
// This will bring the entry to the front of the cache, if it exists.
auto endpoint_backoff_it = endpoint_backoff_.Get(endpoint_backoff_key);
if (endpoint_backoff_it == endpoint_backoff_.end()) {
endpoint_backoff_it = endpoint_backoff_.Put(
std::move(endpoint_backoff_key),
std::make_unique<BackoffEntry>(&policy_->endpoint_backoff_policy,
tick_clock_));
}
endpoint_backoff_it->second->InformOfRequest(succeeded);
}
private:
using EndpointBackoffKey = std::pair<NetworkIsolationKey, GURL>;
const ReportingPolicy* const policy_;
const base::TickClock* const tick_clock_;
const ReportingDelegate* const delegate_;
ReportingCache* const cache_;
RandIntCallback rand_callback_;
// Note: Currently the ReportingBrowsingDataRemover does not clear this data
// because it's not persisted to disk. If it's ever persisted, it will need
// to be cleared as well.
// TODO(chlily): clear this data when endpoints are deleted to avoid unbounded
// growth of this map.
base::MRUCache<EndpointBackoffKey, std::unique_ptr<net::BackoffEntry>>
endpoint_backoff_;
DISALLOW_COPY_AND_ASSIGN(ReportingEndpointManagerImpl);
};
} // namespace
// static
std::unique_ptr<ReportingEndpointManager> ReportingEndpointManager::Create(
const ReportingPolicy* policy,
const base::TickClock* tick_clock,
const ReportingDelegate* delegate,
ReportingCache* cache,
const RandIntCallback& rand_callback) {
return std::make_unique<ReportingEndpointManagerImpl>(
policy, tick_clock, delegate, cache, rand_callback);
}
ReportingEndpointManager::~ReportingEndpointManager() = default;
} // namespace net
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