mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 14:26:09 +03:00
98 lines
3.5 KiB
C++
98 lines
3.5 KiB
C++
// Copyright 2015 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/base/backoff_entry_serializer.h"
|
|
|
|
#include <utility>
|
|
|
|
#include "base/strings/string_number_conversions.h"
|
|
#include "base/time/tick_clock.h"
|
|
#include "base/values.h"
|
|
#include "net/base/backoff_entry.h"
|
|
|
|
namespace {
|
|
// Increment this number when changing the serialization format, to avoid old
|
|
// serialized values loaded from disk etc being misinterpreted.
|
|
const int kSerializationFormatVersion = 1;
|
|
} // namespace
|
|
|
|
namespace net {
|
|
|
|
std::unique_ptr<base::Value> BackoffEntrySerializer::SerializeToValue(
|
|
const BackoffEntry& entry,
|
|
base::Time time_now) {
|
|
std::unique_ptr<base::ListValue> serialized(new base::ListValue());
|
|
serialized->AppendInteger(kSerializationFormatVersion);
|
|
|
|
serialized->AppendInteger(entry.failure_count());
|
|
|
|
// Can't use entry.GetTimeUntilRelease as it doesn't allow negative deltas.
|
|
base::TimeDelta backoff_duration =
|
|
entry.GetReleaseTime() - entry.GetTimeTicksNow();
|
|
// Redundantly stores both the remaining time delta and the absolute time.
|
|
// The delta is used to work around some cases where wall clock time changes.
|
|
serialized->AppendDouble(backoff_duration.InSecondsF());
|
|
base::Time absolute_release_time = backoff_duration + time_now;
|
|
serialized->AppendString(
|
|
base::Int64ToString(absolute_release_time.ToInternalValue()));
|
|
|
|
return std::move(serialized);
|
|
}
|
|
|
|
std::unique_ptr<BackoffEntry> BackoffEntrySerializer::DeserializeFromValue(
|
|
const base::Value& serialized,
|
|
const BackoffEntry::Policy* policy,
|
|
base::TickClock* tick_clock,
|
|
base::Time time_now) {
|
|
const base::ListValue* serialized_list = nullptr;
|
|
if (!serialized.GetAsList(&serialized_list))
|
|
return nullptr;
|
|
if (serialized_list->GetSize() != 4)
|
|
return nullptr;
|
|
int version_number;
|
|
if (!serialized_list->GetInteger(0, &version_number) ||
|
|
version_number != kSerializationFormatVersion) {
|
|
return nullptr;
|
|
}
|
|
|
|
int failure_count;
|
|
if (!serialized_list->GetInteger(1, &failure_count) || failure_count < 0)
|
|
return nullptr;
|
|
double original_backoff_duration_double;
|
|
if (!serialized_list->GetDouble(2, &original_backoff_duration_double))
|
|
return nullptr;
|
|
std::string absolute_release_time_string;
|
|
if (!serialized_list->GetString(3, &absolute_release_time_string))
|
|
return nullptr;
|
|
int64_t absolute_release_time_us;
|
|
if (!base::StringToInt64(absolute_release_time_string,
|
|
&absolute_release_time_us) ||
|
|
absolute_release_time_us < 0) {
|
|
return nullptr;
|
|
}
|
|
|
|
std::unique_ptr<BackoffEntry> entry(new BackoffEntry(policy, tick_clock));
|
|
|
|
for (int n = 0; n < failure_count; n++)
|
|
entry->InformOfRequest(false);
|
|
|
|
base::TimeDelta original_backoff_duration =
|
|
base::TimeDelta::FromSecondsD(original_backoff_duration_double);
|
|
base::Time absolute_release_time =
|
|
base::Time::FromInternalValue(absolute_release_time_us);
|
|
base::TimeDelta backoff_duration = absolute_release_time - time_now;
|
|
// In cases where the system wall clock is rewound, use the redundant
|
|
// original_backoff_duration to ensure the backoff duration isn't longer
|
|
// than it was before serializing (note that it's not possible to protect
|
|
// against the clock being wound forward).
|
|
if (backoff_duration > original_backoff_duration)
|
|
backoff_duration = original_backoff_duration;
|
|
entry->SetCustomReleaseTime(
|
|
entry->BackoffDurationToReleaseTime(backoff_duration));
|
|
|
|
return entry;
|
|
}
|
|
|
|
} // namespace net
|