2018-12-14 23:00:44 +01:00
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#pragma once
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2022-01-30 00:05:02 +01:00
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#include "./lmdb-safe.hh"
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2021-12-22 20:48:53 +01:00
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2022-01-31 22:23:58 +01:00
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#include <c++utilities/conversion/stringbuilder.h>
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2022-01-18 22:08:36 +01:00
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namespace LMDBSafe {
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2018-12-15 17:53:29 +01:00
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/*
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Open issues:
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What is an error? What is an exception?
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2018-12-16 15:58:38 +01:00
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could id=0 be magic? ('no such id')
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2018-12-28 16:33:20 +01:00
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yes
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2018-12-15 17:53:29 +01:00
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Perhaps use the separate index concept from multi_index
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2018-12-16 21:46:53 +01:00
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perhaps get eiter to be of same type so for(auto& a : x) works
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2018-12-28 16:33:20 +01:00
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make it more value "like" with unique_ptr
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2018-12-15 17:53:29 +01:00
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*/
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2018-12-16 20:28:49 +01:00
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/** Return the highest ID used in a database. Returns 0 for an empty DB.
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This makes us start everything at ID=1, which might make it possible to
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treat id 0 as special
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*/
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2022-01-30 21:14:43 +01:00
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LMDB_SAFE_EXPORT unsigned int MDBGetMaxID(MDBRWTransaction &txn, MDBDbi &dbi);
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2018-12-14 23:00:44 +01:00
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2022-01-18 22:24:31 +01:00
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/** This is the serialization interface.
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You need to define your these functions for the types you'd like to store.
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2018-12-16 20:28:49 +01:00
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*/
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2022-01-30 21:14:43 +01:00
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template <typename T> std::string serToString(const T &t);
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2018-12-14 23:00:44 +01:00
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2022-01-30 21:14:43 +01:00
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template <typename T> void serFromString(string_view str, T &ret);
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2018-12-27 17:49:41 +01:00
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2022-01-18 22:24:31 +01:00
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/** This is the serialization interface for keys.
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You need to define your these functions for the types you'd like to use as keys.
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*/
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2022-01-30 21:14:43 +01:00
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template <class T, class Enable> inline std::string keyConv(const T &t);
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2018-12-27 17:49:41 +01:00
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2022-01-30 21:14:43 +01:00
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template <class T, typename std::enable_if<std::is_arithmetic<T>::value, T>::type * = nullptr> inline string_view keyConv(const T &t)
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2018-12-27 17:49:41 +01:00
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{
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2022-01-30 21:14:43 +01:00
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return string_view(reinterpret_cast<const char *>(&t), sizeof(t));
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2018-12-27 17:49:41 +01:00
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}
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2019-01-05 14:40:28 +01:00
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2022-01-30 21:14:43 +01:00
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template <class T, typename std::enable_if<std::is_same<T, std::string>::value, T>::type * = nullptr> inline string_view keyConv(const T &t)
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2018-12-28 16:45:44 +01:00
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{
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2022-01-30 21:14:43 +01:00
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return t;
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2018-12-28 16:45:44 +01:00
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}
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2022-01-30 21:14:43 +01:00
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template <class T, typename std::enable_if<std::is_same<T, string_view>::value, T>::type * = nullptr> inline string_view keyConv(string_view t)
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2022-01-25 23:25:27 +01:00
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{
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2022-01-30 21:14:43 +01:00
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return t;
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2022-01-25 23:25:27 +01:00
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}
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2022-01-22 18:18:15 +01:00
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/*!
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* \brief The LMDBIndexOps struct implements index operations, but only the operations that
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* are broadcast to all indexes.
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*
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* Specifically, to deal with databases with less than the maximum number of interfaces, this
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* only includes calls that should be ignored for empty indexes.
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*
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* This class only needs methods that must happen for all indexes at once. So specifically, *not*
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* size<t> or get<t>. People ask for those themselves, and should no do that on indexes that
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* don't exist.
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*/
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2022-01-30 21:14:43 +01:00
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template <class Class, typename Type, typename Parent> struct LMDB_SAFE_EXPORT LMDBIndexOps {
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explicit LMDBIndexOps(Parent *parent)
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: d_parent(parent)
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{
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}
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2022-02-01 19:47:30 +01:00
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void put(MDBRWTransaction &txn, const Class &t, std::uint32_t id, unsigned int flags = 0)
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2022-01-30 21:14:43 +01:00
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{
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txn->put(d_idx, keyConv(d_parent->getMember(t)), id, flags);
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2018-12-27 17:49:41 +01:00
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}
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2018-12-14 23:00:44 +01:00
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2022-02-01 19:47:30 +01:00
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void del(MDBRWTransaction &txn, const Class &t, std::uint32_t id)
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2022-01-30 21:14:43 +01:00
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{
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if (const auto rc = txn->del(d_idx, keyConv(d_parent->getMember(t)), id)) {
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throw LMDBError("Error deleting from index: ", rc);
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}
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2022-01-26 00:43:21 +01:00
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}
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2022-01-30 21:14:43 +01:00
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void clear(MDBRWTransaction &txn)
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{
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if (const auto rc = mdb_drop(*txn, d_idx, 0)) {
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throw LMDBError("Error clearing index: ", rc);
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}
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}
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void openDB(std::shared_ptr<MDBEnv> &env, string_view str, unsigned int flags)
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{
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d_idx = env->openDB(str, flags);
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}
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MDBDbi d_idx;
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Parent *d_parent;
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2018-12-16 15:58:38 +01:00
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};
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2018-12-14 23:00:44 +01:00
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2018-12-16 20:28:49 +01:00
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/** This is an index on a field in a struct, it derives from the LMDBIndexOps */
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2022-01-30 21:14:43 +01:00
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template <class Class, typename Type, Type Class::*PtrToMember> struct index_on : LMDBIndexOps<Class, Type, index_on<Class, Type, PtrToMember>> {
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index_on()
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: LMDBIndexOps<Class, Type, index_on<Class, Type, PtrToMember>>(this)
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{
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}
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static Type getMember(const Class &c)
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{
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return c.*PtrToMember;
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}
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typedef Type type;
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2018-12-16 15:58:38 +01:00
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};
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2018-12-16 20:28:49 +01:00
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/** This is a calculated index */
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2022-01-30 21:14:43 +01:00
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template <class Class, typename Type, class Func> struct index_on_function : LMDBIndexOps<Class, Type, index_on_function<Class, Type, Func>> {
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index_on_function()
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: LMDBIndexOps<Class, Type, index_on_function<Class, Type, Func>>(this)
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{
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}
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static Type getMember(const Class &c)
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{
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Func f;
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return f(c);
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}
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2018-12-14 23:00:44 +01:00
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2022-01-30 21:14:43 +01:00
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typedef Type type;
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2018-12-14 23:00:44 +01:00
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};
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2022-01-31 22:23:58 +01:00
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/*!
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* \brief The TypedDBI class is the main class.
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* \tparam T Specifies the type to store within the database.
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* \tparam I Specifies an index, should be an instantiation of index_on.
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*/
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template <typename T, typename... I> class LMDB_SAFE_EXPORT TypedDBI {
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public:
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// declare tuple for indexes
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using tuple_t = std::tuple<I...>;
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template <std::size_t N> using index_t = typename std::tuple_element_t<N, tuple_t>::type;
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2018-12-14 23:46:46 +01:00
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2022-01-31 22:23:58 +01:00
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private:
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tuple_t d_tuple;
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template <class Tuple, std::size_t N> struct IndexIterator {
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static inline void apply(Tuple &tuple, auto &&func)
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{
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IndexIterator<Tuple, N - 1>::apply(tuple, std::forward<decltype(func)>(func));
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func(std::get<N - 1>(tuple));
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}
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};
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template <class Tuple> struct IndexIterator<Tuple, 1> {
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static inline void apply(Tuple &tuple, auto &&func)
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{
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func(std::get<0>(tuple));
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}
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};
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void forEachIndex(auto &&func)
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2018-12-14 23:00:44 +01:00
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{
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2022-01-31 22:23:58 +01:00
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IndexIterator<tuple_t, std::tuple_size_v<tuple_t>>::apply(d_tuple, std::forward<decltype(func)>(func));
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2018-12-14 23:00:44 +01:00
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}
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2022-01-30 21:14:43 +01:00
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public:
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TypedDBI(std::shared_ptr<MDBEnv> env, string_view name)
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: d_env(env)
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, d_name(name)
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2018-12-14 23:00:44 +01:00
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{
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2022-01-30 21:14:43 +01:00
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d_main = d_env->openDB(name, MDB_CREATE | MDB_INTEGERKEY);
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2022-01-31 22:23:58 +01:00
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std::size_t index = 0;
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forEachIndex([&](auto &&i) { i.openDB(d_env, CppUtilities::argsToString(name, '_', index++), MDB_CREATE | MDB_DUPFIXED | MDB_DUPSORT); });
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2018-12-14 23:00:44 +01:00
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}
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2018-12-15 17:53:29 +01:00
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2022-01-30 21:14:43 +01:00
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// We support readonly and rw transactions. Here we put the Readonly operations
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// which get sourced by both kinds of transactions
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template <class Parent> struct ReadonlyOperations {
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ReadonlyOperations(Parent &parent)
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: d_parent(parent)
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{
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2018-12-28 16:33:20 +01:00
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}
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2022-01-30 21:14:43 +01:00
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//! Number of entries in main database
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2022-02-01 19:47:30 +01:00
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std::size_t size()
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2022-01-30 21:14:43 +01:00
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{
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MDB_stat stat;
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mdb_stat(**d_parent.d_txn, d_parent.d_parent->d_main, &stat);
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return stat.ms_entries;
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2018-12-28 16:33:20 +01:00
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}
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2022-01-30 21:14:43 +01:00
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//! Number of entries in the various indexes - should be the same
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2022-02-01 19:47:30 +01:00
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template <std::size_t N> std::size_t size()
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2022-01-30 21:14:43 +01:00
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{
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MDB_stat stat;
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mdb_stat(**d_parent.d_txn, std::get<N>(d_parent.d_parent->d_tuple).d_idx, &stat);
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return stat.ms_entries;
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2018-12-15 17:53:29 +01:00
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}
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2018-12-15 21:06:47 +01:00
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2022-01-30 21:14:43 +01:00
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//! Get item with id, from main table directly
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2022-02-01 19:47:30 +01:00
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bool get(std::uint32_t id, T &t)
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2022-01-30 21:14:43 +01:00
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{
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MDBOutVal data;
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if ((*d_parent.d_txn)->get(d_parent.d_parent->d_main, id, data))
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return false;
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serFromString(data.get<string_view>(), t);
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return true;
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2018-12-15 21:06:47 +01:00
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}
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2022-01-30 21:14:43 +01:00
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//! Get item through index N, then via the main database
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2022-02-01 19:47:30 +01:00
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template <std::size_t N> std::uint32_t get(const index_t<N> &key, T &out)
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2022-01-30 21:14:43 +01:00
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{
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MDBOutVal id;
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if (!(*d_parent.d_txn)->get(std::get<N>(d_parent.d_parent->d_tuple).d_idx, keyConv(key), id)) {
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2022-02-01 19:47:30 +01:00
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if (get(id.get<std::uint32_t>(), out))
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return id.get<std::uint32_t>();
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2022-01-30 21:14:43 +01:00
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}
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return 0;
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2018-12-15 17:53:29 +01:00
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}
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2022-01-30 21:14:43 +01:00
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//! Cardinality of index N
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2022-02-01 19:47:30 +01:00
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template <std::size_t N> std::uint32_t cardinality()
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2022-01-30 21:14:43 +01:00
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{
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auto cursor = (*d_parent.d_txn)->getCursor(std::get<N>(d_parent.d_parent->d_tuple).d_idx);
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bool first = true;
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MDBOutVal key, data;
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2022-02-01 19:47:30 +01:00
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std::uint32_t count = 0;
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2022-01-30 21:14:43 +01:00
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while (!cursor.get(key, data, first ? MDB_FIRST : MDB_NEXT_NODUP)) {
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++count;
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first = false;
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}
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return count;
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2018-12-27 17:49:41 +01:00
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}
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2022-01-30 21:14:43 +01:00
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//! End iderator type
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struct eiter_t {
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};
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// can be on main, or on an index
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// when on main, return data directly
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// when on index, indirect
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// we can be limited to one key, or iterate over entire database
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// iter requires you to put the cursor in the right place first!
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struct iter_t {
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explicit iter_t(Parent *parent, typename Parent::cursor_t &&cursor, bool on_index, bool one_key, bool end = false)
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: d_parent(parent)
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, d_cursor(std::move(cursor))
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, d_on_index(on_index)
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, // is this an iterator on main database or on index?
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d_one_key(one_key)
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, // should we stop at end of key? (equal range)
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d_end(end)
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{
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if (d_end)
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return;
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d_prefix.clear();
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if (d_cursor.get(d_key, d_id, MDB_GET_CURRENT)) {
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d_end = true;
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return;
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}
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if (d_on_index) {
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if ((*d_parent->d_txn)->get(d_parent->d_parent->d_main, d_id, d_data))
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throw LMDBError("Missing id in constructor");
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serFromString(d_data.get<string_view>(), d_t);
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} else
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serFromString(d_id.get<string_view>(), d_t);
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}
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explicit iter_t(Parent *parent, typename Parent::cursor_t &&cursor, string_view prefix)
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: d_parent(parent)
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, d_cursor(std::move(cursor))
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, d_on_index(true)
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, // is this an iterator on main database or on index?
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d_one_key(false)
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, d_prefix(prefix)
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, d_end(false)
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{
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if (d_end)
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return;
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if (d_cursor.get(d_key, d_id, MDB_GET_CURRENT)) {
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d_end = true;
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return;
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}
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if (d_on_index) {
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if ((*d_parent->d_txn)->get(d_parent->d_parent->d_main, d_id, d_data))
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throw LMDBError("Missing id in constructor");
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serFromString(d_data.get<string_view>(), d_t);
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} else
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serFromString(d_id.get<string_view>(), d_t);
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}
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std::function<bool(const MDBOutVal &)> filter;
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void del()
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{
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d_cursor.del();
|
|
|
|
}
|
|
|
|
|
|
|
|
bool operator!=(const eiter_t &) const
|
|
|
|
{
|
|
|
|
return !d_end;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool operator==(const eiter_t &) const
|
|
|
|
{
|
|
|
|
return d_end;
|
|
|
|
}
|
|
|
|
|
|
|
|
const T &operator*()
|
|
|
|
{
|
|
|
|
return d_t;
|
|
|
|
}
|
|
|
|
|
|
|
|
const T *operator->()
|
|
|
|
{
|
|
|
|
return &d_t;
|
|
|
|
}
|
|
|
|
|
|
|
|
T &value()
|
|
|
|
{
|
|
|
|
return d_t;
|
|
|
|
}
|
|
|
|
|
|
|
|
// implements generic ++ or --
|
|
|
|
iter_t &genoperator(MDB_cursor_op dupop, MDB_cursor_op op)
|
|
|
|
{
|
|
|
|
MDBOutVal data;
|
|
|
|
next:;
|
|
|
|
const auto rc = d_cursor.get(d_key, d_id, d_one_key ? dupop : op);
|
|
|
|
if (rc == MDB_NOTFOUND) {
|
|
|
|
d_end = true;
|
|
|
|
} else if (rc) {
|
|
|
|
throw LMDBError("Unable to get in genoperator: ", rc);
|
|
|
|
} else if (!d_prefix.empty() && d_key.get<std::string>().rfind(d_prefix, 0) != 0) {
|
|
|
|
d_end = true;
|
|
|
|
} else {
|
|
|
|
if (d_on_index) {
|
|
|
|
if ((*d_parent->d_txn)->get(d_parent->d_parent->d_main, d_id, data))
|
|
|
|
throw LMDBError("Missing id field in genoperator");
|
|
|
|
if (filter && !filter(data))
|
|
|
|
goto next;
|
|
|
|
|
|
|
|
serFromString(data.get<string_view>(), d_t);
|
|
|
|
} else {
|
|
|
|
if (filter && !filter(data))
|
|
|
|
goto next;
|
|
|
|
|
|
|
|
serFromString(d_id.get<string_view>(), d_t);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return *this;
|
|
|
|
}
|
|
|
|
|
|
|
|
iter_t &operator++()
|
|
|
|
{
|
|
|
|
return genoperator(MDB_NEXT_DUP, MDB_NEXT);
|
|
|
|
}
|
|
|
|
iter_t &operator--()
|
|
|
|
{
|
|
|
|
return genoperator(MDB_PREV_DUP, MDB_PREV);
|
|
|
|
}
|
|
|
|
|
|
|
|
// get ID this iterator points to
|
2022-02-01 19:47:30 +01:00
|
|
|
std::uint32_t getID()
|
2022-01-30 21:14:43 +01:00
|
|
|
{
|
|
|
|
if (d_on_index)
|
2022-02-01 19:47:30 +01:00
|
|
|
return d_id.get<std::uint32_t>();
|
2022-01-30 21:14:43 +01:00
|
|
|
else
|
2022-02-01 19:47:30 +01:00
|
|
|
return d_key.get<std::uint32_t>();
|
2022-01-30 21:14:43 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
const MDBOutVal &getKey()
|
|
|
|
{
|
|
|
|
return d_key;
|
|
|
|
}
|
|
|
|
|
|
|
|
// transaction we are part of
|
|
|
|
Parent *d_parent;
|
|
|
|
typename Parent::cursor_t d_cursor;
|
|
|
|
|
|
|
|
// gcc complains if I don't zero-init these, which is worrying XXX
|
|
|
|
MDBOutVal d_key{ { 0, 0 } }, d_data{ { 0, 0 } }, d_id{ { 0, 0 } };
|
|
|
|
bool d_on_index;
|
|
|
|
bool d_one_key;
|
|
|
|
std::string d_prefix;
|
|
|
|
bool d_end{ false };
|
|
|
|
T d_t;
|
|
|
|
};
|
|
|
|
|
2022-02-01 19:37:33 +01:00
|
|
|
template <std::size_t N> iter_t genbegin(MDB_cursor_op op)
|
2022-01-30 21:14:43 +01:00
|
|
|
{
|
|
|
|
typename Parent::cursor_t cursor = (*d_parent.d_txn)->getCursor(std::get<N>(d_parent.d_parent->d_tuple).d_idx);
|
|
|
|
|
|
|
|
MDBOutVal out, id;
|
|
|
|
|
|
|
|
if (cursor.get(out, id, op)) {
|
|
|
|
// on_index, one_key, end
|
|
|
|
return iter_t{ &d_parent, std::move(cursor), true, false, true };
|
|
|
|
}
|
|
|
|
|
|
|
|
return iter_t{ &d_parent, std::move(cursor), true, false };
|
|
|
|
};
|
|
|
|
|
2022-02-01 19:37:33 +01:00
|
|
|
template <std::size_t N> iter_t begin()
|
2022-01-30 21:14:43 +01:00
|
|
|
{
|
|
|
|
return genbegin<N>(MDB_FIRST);
|
2018-12-28 16:33:20 +01:00
|
|
|
}
|
2022-01-30 21:14:43 +01:00
|
|
|
|
2022-02-01 19:37:33 +01:00
|
|
|
template <std::size_t N> iter_t rbegin()
|
2022-01-30 21:14:43 +01:00
|
|
|
{
|
|
|
|
return genbegin<N>(MDB_LAST);
|
2018-12-15 17:53:29 +01:00
|
|
|
}
|
2018-12-14 23:00:44 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
iter_t begin()
|
|
|
|
{
|
|
|
|
typename Parent::cursor_t cursor = (*d_parent.d_txn)->getCursor(d_parent.d_parent->d_main);
|
2018-12-15 21:06:47 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
MDBOutVal out, id;
|
2018-12-27 17:49:41 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
if (cursor.get(out, id, MDB_FIRST)) {
|
|
|
|
// on_index, one_key, end
|
|
|
|
return iter_t{ &d_parent, std::move(cursor), false, false, true };
|
|
|
|
}
|
2018-12-27 17:49:41 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
return iter_t{ &d_parent, std::move(cursor), false, false };
|
|
|
|
};
|
2018-12-15 21:06:47 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
eiter_t end()
|
|
|
|
{
|
|
|
|
return eiter_t();
|
|
|
|
}
|
2018-12-16 20:28:49 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
// basis for find, lower_bound
|
|
|
|
template <std::size_t N> iter_t genfind(const typename std::tuple_element<N, tuple_t>::type::type &key, MDB_cursor_op op)
|
|
|
|
{
|
|
|
|
typename Parent::cursor_t cursor = (*d_parent.d_txn)->getCursor(std::get<N>(d_parent.d_parent->d_tuple).d_idx);
|
2018-12-16 15:58:38 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
const auto keystr = keyConv(key);
|
|
|
|
MDBInVal in(keystr);
|
|
|
|
MDBOutVal out, id;
|
|
|
|
out.d_mdbval = in.d_mdbval;
|
2018-12-16 20:28:49 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
if (cursor.get(out, id, op)) {
|
|
|
|
// on_index, one_key, end
|
|
|
|
return iter_t{ &d_parent, std::move(cursor), true, false, true };
|
|
|
|
}
|
2018-12-16 20:28:49 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
return iter_t{ &d_parent, std::move(cursor), true, false };
|
|
|
|
};
|
2018-12-16 20:28:49 +01:00
|
|
|
|
2022-01-31 22:23:58 +01:00
|
|
|
template <std::size_t N> iter_t find(const index_t<N> &key)
|
2022-01-30 21:14:43 +01:00
|
|
|
{
|
|
|
|
return genfind<N>(key, MDB_SET);
|
|
|
|
}
|
2018-12-16 15:58:38 +01:00
|
|
|
|
2022-01-31 22:23:58 +01:00
|
|
|
template <std::size_t N> iter_t lower_bound(const index_t<N> &key)
|
2022-01-30 21:14:43 +01:00
|
|
|
{
|
|
|
|
return genfind<N>(key, MDB_SET_RANGE);
|
|
|
|
}
|
|
|
|
|
|
|
|
//! equal range - could possibly be expressed through genfind
|
2022-01-31 22:23:58 +01:00
|
|
|
template <std::size_t N> std::pair<iter_t, eiter_t> equal_range(const index_t<N> &key)
|
2022-01-30 21:14:43 +01:00
|
|
|
{
|
|
|
|
typename Parent::cursor_t cursor = (*d_parent.d_txn)->getCursor(std::get<N>(d_parent.d_parent->d_tuple).d_idx);
|
|
|
|
|
|
|
|
const auto keyString = keyConv(key);
|
|
|
|
MDBInVal in(keyString);
|
|
|
|
MDBOutVal out, id;
|
|
|
|
out.d_mdbval = in.d_mdbval;
|
|
|
|
|
|
|
|
if (cursor.get(out, id, MDB_SET)) {
|
|
|
|
// on_index, one_key, end
|
|
|
|
return { iter_t{ &d_parent, std::move(cursor), true, true, true }, eiter_t() };
|
|
|
|
}
|
|
|
|
|
|
|
|
return { iter_t{ &d_parent, std::move(cursor), true, true }, eiter_t() };
|
|
|
|
};
|
|
|
|
|
|
|
|
//! equal range - could possibly be expressed through genfind
|
2022-01-31 22:23:58 +01:00
|
|
|
template <std::size_t N> std::pair<iter_t, eiter_t> prefix_range(const index_t<N> &key)
|
2022-01-30 21:14:43 +01:00
|
|
|
{
|
|
|
|
typename Parent::cursor_t cursor = (*d_parent.d_txn)->getCursor(std::get<N>(d_parent.d_parent->d_tuple).d_idx);
|
|
|
|
|
|
|
|
const auto keyString = keyConv(key);
|
|
|
|
MDBInVal in(keyString);
|
|
|
|
MDBOutVal out, id;
|
|
|
|
out.d_mdbval = in.d_mdbval;
|
|
|
|
|
|
|
|
if (cursor.get(out, id, MDB_SET_RANGE)) {
|
|
|
|
// on_index, one_key, end
|
|
|
|
return { iter_t{ &d_parent, std::move(cursor), true, true, true }, eiter_t() };
|
|
|
|
}
|
|
|
|
|
|
|
|
return { iter_t(&d_parent, std::move(cursor), keyString), eiter_t() };
|
|
|
|
};
|
|
|
|
|
|
|
|
Parent &d_parent;
|
2018-12-28 16:33:20 +01:00
|
|
|
};
|
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
class LMDB_SAFE_EXPORT ROTransaction : public ReadonlyOperations<ROTransaction> {
|
|
|
|
public:
|
|
|
|
explicit ROTransaction(TypedDBI *parent)
|
|
|
|
: ReadonlyOperations<ROTransaction>(*this)
|
|
|
|
, d_parent(parent)
|
|
|
|
, d_txn(std::make_shared<MDBROTransaction>(d_parent->d_env->getROTransaction()))
|
|
|
|
{
|
|
|
|
}
|
2018-12-14 23:00:44 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
explicit ROTransaction(TypedDBI *parent, std::shared_ptr<MDBROTransaction> txn)
|
|
|
|
: ReadonlyOperations<ROTransaction>(*this)
|
|
|
|
, d_parent(parent)
|
|
|
|
, d_txn(txn)
|
|
|
|
{
|
|
|
|
}
|
2018-12-17 14:56:01 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
ROTransaction(ROTransaction &&rhs)
|
|
|
|
: ReadonlyOperations<ROTransaction>(*this)
|
|
|
|
, d_parent(rhs.d_parent)
|
|
|
|
, d_txn(std::move(rhs.d_txn))
|
2018-12-14 23:00:44 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
{
|
|
|
|
rhs.d_parent = 0;
|
|
|
|
}
|
2018-12-14 23:00:44 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
std::shared_ptr<MDBROTransaction> getTransactionHandle()
|
|
|
|
{
|
|
|
|
return d_txn;
|
|
|
|
}
|
2018-12-17 14:56:01 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
typedef MDBROCursor cursor_t;
|
2018-12-14 23:00:44 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
TypedDBI *d_parent;
|
|
|
|
std::shared_ptr<MDBROTransaction> d_txn;
|
|
|
|
};
|
|
|
|
|
|
|
|
class LMDB_SAFE_EXPORT RWTransaction : public ReadonlyOperations<RWTransaction> {
|
|
|
|
public:
|
|
|
|
explicit RWTransaction(TypedDBI *parent)
|
|
|
|
: ReadonlyOperations<RWTransaction>(*this)
|
|
|
|
, d_parent(parent)
|
|
|
|
{
|
|
|
|
d_txn = std::make_shared<MDBRWTransaction>(d_parent->d_env->getRWTransaction());
|
|
|
|
}
|
|
|
|
|
|
|
|
explicit RWTransaction(TypedDBI *parent, std::shared_ptr<MDBRWTransaction> txn)
|
|
|
|
: ReadonlyOperations<RWTransaction>(*this)
|
|
|
|
, d_parent(parent)
|
|
|
|
, d_txn(txn)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
RWTransaction(RWTransaction &&rhs)
|
|
|
|
: ReadonlyOperations<RWTransaction>(*this)
|
|
|
|
, d_parent(rhs.d_parent)
|
|
|
|
, d_txn(std::move(rhs.d_txn))
|
|
|
|
{
|
|
|
|
rhs.d_parent = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
// insert something, with possibly a specific id
|
2022-02-01 19:47:30 +01:00
|
|
|
std::uint32_t put(const T &t, std::uint32_t id = 0)
|
2022-01-30 21:14:43 +01:00
|
|
|
{
|
|
|
|
unsigned int flags = 0;
|
|
|
|
if (!id) {
|
|
|
|
id = MDBGetMaxID(*d_txn, d_parent->d_main) + 1;
|
|
|
|
flags = MDB_APPEND;
|
|
|
|
}
|
|
|
|
(*d_txn)->put(d_parent->d_main, id, serToString(t), flags);
|
2022-01-31 22:23:58 +01:00
|
|
|
d_parent->forEachIndex([&](auto &&i) { i.put(*d_txn, t, id); });
|
2022-01-30 21:14:43 +01:00
|
|
|
return id;
|
|
|
|
}
|
2018-12-14 23:00:44 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
// modify an item 'in place', plus update indexes
|
2022-02-01 19:47:30 +01:00
|
|
|
void modify(std::uint32_t id, std::function<void(T &)> func)
|
2022-01-30 21:14:43 +01:00
|
|
|
{
|
|
|
|
T t;
|
|
|
|
if (!this->get(id, t))
|
|
|
|
throw LMDBError("Could not modify id " + std::to_string(id));
|
|
|
|
func(t);
|
2018-12-14 23:00:44 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
del(id); // this is the lazy way. We could test for changed index fields
|
|
|
|
put(t, id);
|
|
|
|
}
|
2018-12-15 17:53:29 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
//! delete an item, and from indexes
|
2022-02-01 19:47:30 +01:00
|
|
|
void del(std::uint32_t id)
|
2022-01-30 21:14:43 +01:00
|
|
|
{
|
|
|
|
T t;
|
|
|
|
if (!this->get(id, t))
|
|
|
|
return;
|
|
|
|
|
|
|
|
(*d_txn)->del(d_parent->d_main, id);
|
|
|
|
clearIndex(id, t);
|
|
|
|
}
|
|
|
|
|
|
|
|
//! clear database & indexes
|
|
|
|
void clear()
|
|
|
|
{
|
|
|
|
if (const auto rc = mdb_drop(**d_txn, d_parent->d_main, 0)) {
|
|
|
|
throw LMDBError("Error database: ", rc);
|
|
|
|
}
|
2022-01-31 22:23:58 +01:00
|
|
|
d_parent->forEachIndex([&](auto &&i) { i.clear(*d_txn); });
|
2022-01-30 21:14:43 +01:00
|
|
|
}
|
2018-12-16 20:28:49 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
//! commit this transaction
|
|
|
|
void commit()
|
|
|
|
{
|
|
|
|
(*d_txn)->commit();
|
|
|
|
}
|
|
|
|
|
|
|
|
//! abort this transaction
|
|
|
|
void abort()
|
|
|
|
{
|
|
|
|
(*d_txn)->abort();
|
|
|
|
}
|
|
|
|
|
|
|
|
typedef MDBRWCursor cursor_t;
|
|
|
|
|
|
|
|
std::shared_ptr<MDBRWTransaction> getTransactionHandle()
|
|
|
|
{
|
|
|
|
return d_txn;
|
|
|
|
}
|
|
|
|
|
|
|
|
private:
|
|
|
|
// clear this ID from all indexes
|
2022-02-01 19:47:30 +01:00
|
|
|
void clearIndex(std::uint32_t id, const T &t)
|
2022-01-30 21:14:43 +01:00
|
|
|
{
|
2022-01-31 22:23:58 +01:00
|
|
|
d_parent->forEachIndex([&](auto &&i) { i.del(*d_txn, t, id); });
|
2022-01-30 21:14:43 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
public:
|
|
|
|
TypedDBI *d_parent;
|
|
|
|
std::shared_ptr<MDBRWTransaction> d_txn;
|
|
|
|
};
|
|
|
|
|
|
|
|
//! Get an RW transaction
|
|
|
|
RWTransaction getRWTransaction()
|
2018-12-15 17:53:29 +01:00
|
|
|
{
|
2022-01-30 21:14:43 +01:00
|
|
|
return RWTransaction(this);
|
2018-12-15 17:53:29 +01:00
|
|
|
}
|
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
//! Get an RO transaction
|
|
|
|
ROTransaction getROTransaction()
|
2018-12-15 17:53:29 +01:00
|
|
|
{
|
2022-01-30 21:14:43 +01:00
|
|
|
return ROTransaction(this);
|
2018-12-15 17:53:29 +01:00
|
|
|
}
|
2018-12-15 00:46:15 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
//! Get an RW transaction
|
|
|
|
RWTransaction getRWTransaction(std::shared_ptr<MDBRWTransaction> txn)
|
|
|
|
{
|
|
|
|
return RWTransaction(this, txn);
|
|
|
|
}
|
2018-12-17 14:56:01 +01:00
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
//! Get an RO transaction
|
|
|
|
ROTransaction getROTransaction(std::shared_ptr<MDBROTransaction> txn)
|
2018-12-17 14:56:01 +01:00
|
|
|
{
|
2022-01-30 21:14:43 +01:00
|
|
|
return ROTransaction(this, txn);
|
2018-12-17 14:56:01 +01:00
|
|
|
}
|
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
std::shared_ptr<MDBEnv> getEnv()
|
2018-12-14 23:46:46 +01:00
|
|
|
{
|
2022-01-30 21:14:43 +01:00
|
|
|
return d_env;
|
2018-12-14 23:46:46 +01:00
|
|
|
}
|
2018-12-15 17:53:29 +01:00
|
|
|
|
2018-12-14 23:46:46 +01:00
|
|
|
private:
|
2022-01-30 21:14:43 +01:00
|
|
|
std::shared_ptr<MDBEnv> d_env;
|
|
|
|
MDBDbi d_main;
|
|
|
|
std::string d_name;
|
2018-12-14 23:46:46 +01:00
|
|
|
};
|
|
|
|
|
2022-01-30 21:14:43 +01:00
|
|
|
} // namespace LMDBSafe
|