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// Copyright 2013 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 "chrome/browser/net/evicted_domain_cookie_counter.h"
#include <algorithm>
#include <vector>
#include "base/metrics/histogram.h"
#include "base/stl_util.h"
#include "base/strings/string_util.h"
#include "components/google/core/browser/google_util.h"
#include "net/cookies/canonical_cookie.h"
namespace chrome_browser_net {
using base::Time;
using base::TimeDelta;
namespace {
const size_t kMaxEvictedDomainCookies = 500;
const size_t kPurgeEvictedDomainCookies = 100;
class DelegateImpl : public EvictedDomainCookieCounter::Delegate {
public:
DelegateImpl();
// EvictedDomainCookieCounter::Delegate implementation.
void Report(const EvictedDomainCookieCounter::EvictedCookie& evicted_cookie,
const Time& reinstatement_time) override;
Time CurrentTime() const override;
};
DelegateImpl::DelegateImpl() {}
void DelegateImpl::Report(
const EvictedDomainCookieCounter::EvictedCookie& evicted_cookie,
const Time& reinstatement_time) {
TimeDelta reinstatement_delay(
reinstatement_time - evicted_cookie.eviction_time);
// Need to duplicate UMA_HISTOGRAM_CUSTOM_TIMES(), since it is a macro that
// defines a static variable.
if (evicted_cookie.is_google) {
UMA_HISTOGRAM_CUSTOM_TIMES("Cookie.ReinstatedCookiesGoogle",
reinstatement_delay,
TimeDelta::FromSeconds(1),
TimeDelta::FromDays(7),
50);
} else {
UMA_HISTOGRAM_CUSTOM_TIMES("Cookie.ReinstatedCookiesOther",
reinstatement_delay,
TimeDelta::FromSeconds(1),
TimeDelta::FromDays(7),
50);
}
}
Time DelegateImpl::CurrentTime() const {
return Time::Now();
}
} // namespace
EvictedDomainCookieCounter::EvictedDomainCookieCounter(
scoped_refptr<net::CookieMonster::Delegate> next_cookie_monster_delegate)
: next_cookie_monster_delegate_(next_cookie_monster_delegate),
cookie_counter_delegate_(new DelegateImpl),
max_size_(kMaxEvictedDomainCookies),
purge_count_(kPurgeEvictedDomainCookies) {
}
EvictedDomainCookieCounter::EvictedDomainCookieCounter(
scoped_refptr<net::CookieMonster::Delegate> next_cookie_monster_delegate,
scoped_ptr<Delegate> cookie_counter_delegate,
size_t max_size,
size_t purge_count)
: next_cookie_monster_delegate_(next_cookie_monster_delegate),
cookie_counter_delegate_(cookie_counter_delegate.Pass()),
max_size_(max_size),
purge_count_(purge_count) {
DCHECK(cookie_counter_delegate_);
DCHECK_LT(purge_count, max_size_);
}
EvictedDomainCookieCounter::~EvictedDomainCookieCounter() {
STLDeleteContainerPairSecondPointers(evicted_cookies_.begin(),
evicted_cookies_.end());
}
size_t EvictedDomainCookieCounter::GetStorageSize() const {
return evicted_cookies_.size();
}
void EvictedDomainCookieCounter::OnCookieChanged(
const net::CanonicalCookie& cookie,
bool removed,
ChangeCause cause) {
EvictedDomainCookieCounter::EvictedCookieKey key(GetKey(cookie));
Time current_time(cookie_counter_delegate_->CurrentTime());
if (removed) {
if (cause == net::CookieMonster::Delegate::CHANGE_COOKIE_EVICTED)
StoreEvictedCookie(key, cookie, current_time);
} else { // Includes adds or updates.
ProcessNewCookie(key, cookie, current_time);
}
if (next_cookie_monster_delegate_.get())
next_cookie_monster_delegate_->OnCookieChanged(cookie, removed, cause);
}
void EvictedDomainCookieCounter::OnLoaded() {
if (next_cookie_monster_delegate_.get())
next_cookie_monster_delegate_->OnLoaded();
}
// static
EvictedDomainCookieCounter::EvictedCookieKey
EvictedDomainCookieCounter::GetKey(const net::CanonicalCookie& cookie) {
return cookie.Domain() + ";" + cookie.Path() + ";" + cookie.Name();
}
// static
bool EvictedDomainCookieCounter::CompareEvictedCookie(
const EvictedCookieMap::iterator evicted_cookie1,
const EvictedCookieMap::iterator evicted_cookie2) {
return evicted_cookie1->second->eviction_time
< evicted_cookie2->second->eviction_time;
}
void EvictedDomainCookieCounter::GarbageCollect(const Time& current_time) {
if (evicted_cookies_.size() <= max_size_)
return;
// From |evicted_cookies_|, removed all expired cookies, and remove cookies
// with the oldest |eviction_time| so that |size_goal| is attained.
size_t size_goal = max_size_ - purge_count_;
// Bound on number of non-expired cookies to remove.
size_t remove_quota = evicted_cookies_.size() - size_goal;
DCHECK_GT(remove_quota, 0u);
std::vector<EvictedCookieMap::iterator> remove_list;
remove_list.reserve(evicted_cookies_.size());
EvictedCookieMap::iterator it = evicted_cookies_.begin();
while (it != evicted_cookies_.end()) {
if (it->second->is_expired(current_time)) {
delete it->second;
evicted_cookies_.erase(it++); // Post-increment idiom for in-loop removal.
if (remove_quota)
--remove_quota;
} else {
if (remove_quota) // Don't bother storing if quota met.
remove_list.push_back(it);
++it;
}
}
// Free the oldest |remove_quota| non-expired cookies.
std::partial_sort(remove_list.begin(), remove_list.begin() + remove_quota,
remove_list.end(), CompareEvictedCookie);
for (size_t i = 0; i < remove_quota; ++i) {
delete remove_list[i]->second;
evicted_cookies_.erase(remove_list[i]);
}
// Apply stricter check if non-expired cookies were deleted.
DCHECK(remove_quota ? evicted_cookies_.size() == size_goal :
evicted_cookies_.size() <= size_goal);
}
void EvictedDomainCookieCounter::StoreEvictedCookie(
const EvictedCookieKey& key,
const net::CanonicalCookie& cookie,
const Time& current_time) {
bool is_google = google_util::IsGoogleHostname(
cookie.Domain(), google_util::ALLOW_SUBDOMAIN);
EvictedCookie* evicted_cookie =
new EvictedCookie(current_time, cookie.ExpiryDate(), is_google);
std::pair<EvictedCookieMap::iterator, bool> prev_entry =
evicted_cookies_.insert(
EvictedCookieMap::value_type(key, evicted_cookie));
if (!prev_entry.second) {
NOTREACHED();
delete prev_entry.first->second;
prev_entry.first->second = evicted_cookie;
}
GarbageCollect(current_time);
}
void EvictedDomainCookieCounter::ProcessNewCookie(
const EvictedCookieKey& key,
const net::CanonicalCookie& cc,
const Time& current_time) {
EvictedCookieMap::iterator it = evicted_cookies_.find(key);
if (it != evicted_cookies_.end()) {
if (!it->second->is_expired(current_time)) // Reinstatement.
cookie_counter_delegate_->Report(*it->second, current_time);
delete it->second;
evicted_cookies_.erase(it);
}
}
} // namespace chrome_browser_net
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