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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab ft=cpp
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2019 Red Hat, Inc.
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#pragma once
#include "rgw_service.h"
#include "rgw_period_history.h"
#include "rgw_period_puller.h"
#include "svc_meta_be.h"
class RGWMetadataLog;
class RGWMetadataLogHistory;
class RGWCoroutine;
class RGWSI_Zone;
class RGWSI_SysObj;
class RGWSI_RADOS;
namespace mdlog {
class ReadHistoryCR;
class WriteHistoryCR;
}
class RGWSI_MDLog : public RGWServiceInstance
{
friend class mdlog::ReadHistoryCR;
friend class mdlog::WriteHistoryCR;
// maintain a separate metadata log for each period
std::map<std::string, RGWMetadataLog> md_logs;
// use the current period's log for mutating operations
RGWMetadataLog* current_log{nullptr};
bool run_sync;
// pulls missing periods for period_history
std::unique_ptr<RGWPeriodPuller> period_puller;
// maintains a connected history of periods
std::unique_ptr<RGWPeriodHistory> period_history;
public:
RGWSI_MDLog(CephContext *cct, bool run_sync);
virtual ~RGWSI_MDLog();
struct Svc {
RGWSI_RADOS *rados{nullptr};
RGWSI_Zone *zone{nullptr};
RGWSI_SysObj *sysobj{nullptr};
RGWSI_MDLog *mdlog{nullptr};
RGWSI_Cls *cls{nullptr};
} svc;
int init(RGWSI_RADOS *_rados_svc,
RGWSI_Zone *_zone_svc,
RGWSI_SysObj *_sysobj_svc,
RGWSI_Cls *_cls_svc);
int do_start(optional_yield y, const DoutPrefixProvider *dpp) override;
// traverse all the way back to the beginning of the period history, and
// return a cursor to the first period in a fully attached history
RGWPeriodHistory::Cursor find_oldest_period(const DoutPrefixProvider *dpp, optional_yield y);
/// initialize the oldest log period if it doesn't exist, and attach it to
/// our current history
RGWPeriodHistory::Cursor init_oldest_log_period(optional_yield y, const DoutPrefixProvider *dpp);
/// read the oldest log period, and return a cursor to it in our existing
/// period history
RGWPeriodHistory::Cursor read_oldest_log_period(optional_yield y, const DoutPrefixProvider *dpp) const;
/// read the oldest log period asynchronously and write its result to the
/// given cursor pointer
RGWCoroutine* read_oldest_log_period_cr(const DoutPrefixProvider *dpp,
RGWPeriodHistory::Cursor *period,
RGWObjVersionTracker *objv) const;
/// try to advance the oldest log period when the given period is trimmed,
/// using a rados lock to provide atomicity
RGWCoroutine* trim_log_period_cr(const DoutPrefixProvider *dpp,
RGWPeriodHistory::Cursor period,
RGWObjVersionTracker *objv) const;
int read_history(RGWMetadataLogHistory *state, RGWObjVersionTracker *objv_tracker,optional_yield y, const DoutPrefixProvider *dpp) const;
int write_history(const DoutPrefixProvider *dpp,
const RGWMetadataLogHistory& state,
RGWObjVersionTracker *objv_tracker,
optional_yield y, bool exclusive = false);
int add_entry(const DoutPrefixProvider *dpp, const std::string& hash_key, const std::string& section, const std::string& key, bufferlist& bl);
int get_shard_id(const std::string& hash_key, int *shard_id);
RGWPeriodHistory *get_period_history() {
return period_history.get();
}
int pull_period(const DoutPrefixProvider *dpp, const std::string& period_id, RGWPeriod& period, optional_yield y);
/// find or create the metadata log for the given period
RGWMetadataLog* get_log(const std::string& period);
};
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