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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 COMPONENTS_METRICS_LOG_STORE_H_
#define COMPONENTS_METRICS_LOG_STORE_H_
#include <string>
namespace metrics {
// Interface for local storage of serialized logs to be reported.
// It allows consumers to check if there are logs to consume, consume them one
// at a time by staging and discarding logs, and persist/load the whole set.
class LogStore {
public:
// Returns true if there are any logs waiting to be uploaded.
virtual bool has_unsent_logs() const = 0;
// Returns true if there is a log that needs to be, or is being, uploaded.
virtual bool has_staged_log() const = 0;
// The text of the staged log, as a serialized protobuf.
// Will trigger a DCHECK if there is no staged log.
virtual const std::string& staged_log() const = 0;
// The SHA1 hash of the staged log. This is used to detect log corruption.
// Will trigger a DCHECK if there is no staged log.
virtual const std::string& staged_log_hash() const = 0;
// The HMAC-SHA256 signature of the staged log. This is used to validate that
// a log originated from Chrome, and to detect corruption.
// Will trigger a DCHECK if there is no staged log.
virtual const std::string& staged_log_signature() const = 0;
// Populates staged_log() with the next stored log to send.
// The order in which logs are staged is up to the implementor.
// The staged_log must remain the same even if additional logs are added.
// Should only be called if has_unsent_logs() is true.
virtual void StageNextLog() = 0;
// Discards the staged log.
virtual void DiscardStagedLog() = 0;
// Marks the staged log as sent, DiscardStagedLog() shall still be called if
// the staged log needs discarded.
virtual void MarkStagedLogAsSent() = 0;
// Saves any unsent logs to persistent storage.
virtual void PersistUnsentLogs() const = 0;
// Loads unsent logs from persistent storage.
virtual void LoadPersistedUnsentLogs() = 0;
};
} // namespace metrics
#endif // COMPONENTS_METRICS_LOG_STORE_H_
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