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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* In-memory crash non-safe keyvalue db
* Author: Ramesh Chander, Ramesh.Chander@sandisk.com
*/
#ifndef CEPH_OS_BLUESTORE_MEMDB_H
#define CEPH_OS_BLUESTORE_MEMDB_H
#include "include/buffer.h"
#include <ostream>
#include <set>
#include <map>
#include <string>
#include <memory>
#include <boost/scoped_ptr.hpp>
#include "include/encoding.h"
#include "include/btree_map.h"
#include "KeyValueDB.h"
#include "osd/osd_types.h"
using std::string;
#define KEY_DELIM '\0'
class PerfCounters;
enum {
l_memdb_first = 34440,
l_memdb_gets,
l_memdb_txns,
l_memdb_get_latency,
l_memdb_submit_latency,
l_memdb_last,
};
class MemDB : public KeyValueDB
{
typedef std::pair<std::pair<std::string, std::string>, bufferlist> ms_op_t;
std::mutex m_lock;
uint64_t m_total_bytes;
uint64_t m_allocated_bytes;
typedef std::map<std::string, bufferptr> mdb_map_t;
typedef mdb_map_t::iterator mdb_iter_t;
bool m_using_btree;
mdb_map_t m_map;
CephContext *m_cct;
PerfCounters *logger;
void* m_priv;
string m_options;
string m_db_path;
int transaction_rollback(KeyValueDB::Transaction t);
int _open(ostream &out);
void close() override;
bool _get(const string &prefix, const string &k, bufferlist *out);
bool _get_locked(const string &prefix, const string &k, bufferlist *out);
std::string _get_data_fn();
void _encode(mdb_iter_t iter, bufferlist &bl);
void _save();
int _load();
uint64_t iterator_seq_no;
public:
MemDB(CephContext *c, const string &path, void *p) :
m_total_bytes(0), m_allocated_bytes(0), m_using_btree(false),
m_cct(c), logger(NULL), m_priv(p), m_db_path(path), iterator_seq_no(1)
{
//Nothing as of now
}
~MemDB() override;
int set_merge_operator(const std::string& prefix,
std::shared_ptr<MergeOperator> mop) override;
std::shared_ptr<MergeOperator> _find_merge_op(const std::string &prefix);
static
int _test_init(const string& dir) { return 0; };
class MDBTransactionImpl : public KeyValueDB::TransactionImpl {
public:
enum op_type { WRITE = 1, MERGE = 2, DELETE = 3};
private:
std::vector<std::pair<op_type, ms_op_t>> ops;
MemDB *m_db;
bool key_is_prefixed(const string &prefix, const string& full_key);
public:
const std::vector<std::pair<op_type, ms_op_t>>&
get_ops() { return ops; };
void set(const std::string &prefix, const std::string &key,
const bufferlist &val) override;
using KeyValueDB::TransactionImpl::set;
void rmkey(const std::string &prefix, const std::string &k) override;
using KeyValueDB::TransactionImpl::rmkey;
void rmkeys_by_prefix(const std::string &prefix) override;
void rm_range_keys(
const string &prefix,
const string &start,
const string &end) override;
void merge(const std::string &prefix, const std::string &key, const bufferlist &value) override;
void clear() {
ops.clear();
}
explicit MDBTransactionImpl(MemDB* _db) :m_db(_db)
{
ops.clear();
}
~MDBTransactionImpl() override {};
};
private:
/*
* Transaction states.
*/
int _merge(const std::string &k, bufferptr &bl);
int _merge(ms_op_t &op);
int _setkey(ms_op_t &op);
int _rmkey(ms_op_t &op);
public:
int init(string option_str="") override { m_options = option_str; return 0; }
int _init(bool format);
int do_open(ostream &out, bool create);
int open(ostream &out, const std::vector<ColumnFamily>&) override;
int create_and_open(ostream &out, const std::vector<ColumnFamily>&) override;
using KeyValueDB::create_and_open;
KeyValueDB::Transaction get_transaction() override {
return std::shared_ptr<MDBTransactionImpl>(new MDBTransactionImpl(this));
}
int submit_transaction(Transaction) override;
int submit_transaction_sync(Transaction) override;
int get(const std::string &prefix, const std::set<std::string> &key,
std::map<std::string, bufferlist> *out) override;
int get(const std::string &prefix, const std::string &key,
bufferlist *out) override;
using KeyValueDB::get;
class MDBWholeSpaceIteratorImpl : public KeyValueDB::WholeSpaceIteratorImpl {
mdb_iter_t m_iter;
std::pair<string, bufferlist> m_key_value;
mdb_map_t *m_map_p;
std::mutex *m_map_lock_p;
uint64_t *global_seq_no;
uint64_t this_seq_no;
bool m_using_btree;
public:
MDBWholeSpaceIteratorImpl(mdb_map_t *btree_p, std::mutex *btree_lock_p,
uint64_t *iterator_seq_no, bool using_btree) {
m_map_p = btree_p;
m_map_lock_p = btree_lock_p;
std::lock_guard<std::mutex> l(*m_map_lock_p);
global_seq_no = iterator_seq_no;
this_seq_no = *iterator_seq_no;
m_using_btree = using_btree;
}
void fill_current();
void free_last();
int seek_to_first(const std::string &k) override;
int seek_to_last(const std::string &k) override;
int seek_to_first() override { return seek_to_first(std::string()); };
int seek_to_last() override { return seek_to_last(std::string()); };
int upper_bound(const std::string &prefix, const std::string &after) override;
int lower_bound(const std::string &prefix, const std::string &to) override;
bool valid() override;
bool iterator_validate();
int next() override;
int prev() override;
int status() override { return 0; };
std::string key() override;
std::pair<std::string,std::string> raw_key() override;
bool raw_key_is_prefixed(const std::string &prefix) override;
bufferlist value() override;
~MDBWholeSpaceIteratorImpl() override;
};
uint64_t get_estimated_size(std::map<std::string,uint64_t> &extra) override {
std::lock_guard<std::mutex> l(m_lock);
return m_allocated_bytes;
};
int get_statfs(struct store_statfs_t *buf) override {
std::lock_guard<std::mutex> l(m_lock);
buf->reset();
buf->total = m_total_bytes;
buf->allocated = m_allocated_bytes;
buf->data_stored = m_total_bytes;
return 0;
}
WholeSpaceIterator get_wholespace_iterator() override {
return std::shared_ptr<KeyValueDB::WholeSpaceIteratorImpl>(
new MDBWholeSpaceIteratorImpl(&m_map, &m_lock, &iterator_seq_no, m_using_btree));
}
};
#endif
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