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// Copyright 2015 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_BASE_BACKOFF_ENTRY_SERIALIZER_H_
#define NET_BASE_BACKOFF_ENTRY_SERIALIZER_H_
#include <memory>
#include "base/time/time.h"
#include "base/values.h"
#include "net/base/backoff_entry.h"
#include "net/base/net_export.h"
namespace base {
class TickClock;
}
namespace net {
enum SerializationFormatVersion {
kVersion1 = 1,
kVersion2,
};
// Serialize or deserialize a BackoffEntry, so it can persist beyond the
// lifetime of the browser.
class NET_EXPORT BackoffEntrySerializer {
public:
BackoffEntrySerializer() = delete;
BackoffEntrySerializer(const BackoffEntrySerializer&) = delete;
BackoffEntrySerializer& operator=(const BackoffEntrySerializer&) = delete;
// Serializes the release time and failure count into a List that can
// later be passed to Deserialize to re-create the given BackoffEntry. It
// always serializes using the latest format version. The Policy is not
// serialized, instead callers must pass an identical Policy* when
// deserializing. `time_now` should be `base::Time::Now()`, except for tests
// that want to simulate time changes. The release time TimeTicks will be
// converted to an absolute timestamp, thus the time will continue counting
// down even whilst the device is powered off, and will be partially
// vulnerable to changes in the system clock time.
static base::Value::List SerializeToList(const BackoffEntry& entry,
base::Time time_now);
// Deserializes a `list` back to a BackoffEntry. It supports all
// serialization format versions. `policy` MUST be the same Policy as the
// serialized entry had. `clock` may be NULL. Both `policy` and `clock` (if
// not NULL) must enclose lifetime of the returned BackoffEntry. `time_now`
// should be `base::Time::Now()`, except for tests that want to simulate time
// changes. The absolute timestamp that was serialized will be converted back
// to TimeTicks as best as possible. Returns NULL if deserialization was
// unsuccessful.
static std::unique_ptr<BackoffEntry> DeserializeFromList(
const base::Value::List& serialized,
const BackoffEntry::Policy* policy,
const base::TickClock* clock,
base::Time time_now);
};
} // namespace net
#endif // NET_BASE_BACKOFF_ENTRY_SERIALIZER_H_
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