/* Copyright (C) MariaDB Corporation Ab This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */ /** @file ha_connect.h Author Olivier Bertrand @brief The ha_connect engine is a prototype storage engine to access external data. @see /sql/handler.h and /storage/connect/ha_connect.cc */ #ifdef USE_PRAGMA_INTERFACE #pragma interface /* gcc class implementation */ #endif /****************************************************************************/ /* mycat.h contains the TOS, PTOS, ha_table_option_struct declarations. */ /****************************************************************************/ #include "mycat.h" #if defined(JAVA_SUPPORT) || defined(CMGO_SUPPORT) bool MongoEnabled(void); #endif // JAVA_SUPPORT || CMGO_SUPPORT /****************************************************************************/ /* Structures used to pass info between CONNECT and ha_connect. */ /****************************************************************************/ typedef struct _create_xinfo { char *Type; /* Retrieved from table comment */ char *Filename; /* Set if not standard */ char *IndexFN; /* Set if not standard */ ulonglong Maxrows; /* Estimated max nb of rows */ ulong Lrecl; /* Set if not default */ ulong Elements; /* Number of lines in blocks */ bool Fixed; /* False for DOS type */ void *Pcf; /* To list of columns */ void *Pxdf; /* To list of indexes */ } CRXINFO, *PCXF; typedef struct _xinfo { ulonglong data_file_length; /* Length of data file */ ha_rows records; /* Records in table */ ulong mean_rec_length; /* Physical record length */ char *data_file_name; /* Physical file name */ } XINFO, *PXF; class XCHK : public BLOCK { public: XCHK(void) {oldsep= newsep= false; oldopn= newopn= NULL; oldpix= newpix= NULL;} inline char *SetName(PGLOBAL g, PCSZ name) {return PlugDup(g, name);} bool oldsep; // Sepindex before create/alter bool newsep; // Sepindex after create/alter char *oldopn; // Optname before create/alter char *newopn; // Optname after create/alter PIXDEF oldpix; // The indexes before create/alter PIXDEF newpix; // The indexes after create/alter }; // end of class XCHK typedef class XCHK *PCHK; typedef class user_connect *PCONNECT; typedef struct ha_field_option_struct FOS, *PFOS; typedef struct ha_index_option_struct XOS, *PXOS; extern handlerton *connect_hton; /** structure for CREATE TABLE options (table options) These can be specified in the CREATE TABLE: CREATE TABLE ( ... ) {...here...} ------ Was moved to mycat.h ------ */ /** structure for CREATE TABLE options (field options) These can be specified in the CREATE TABLE per field: CREATE TABLE ( field ... {...here...}, ... ) */ struct ha_field_option_struct { ulonglong offset; ulonglong freq; ulonglong fldlen; uint opt; const char *dateformat; const char *fieldformat; char *special; }; /* index options can be declared similarly using the ha_index_option_struct structure. Their values can be specified in the CREATE TABLE per index: CREATE TABLE ( field ..., .., INDEX .... *here*, ... ) */ struct ha_index_option_struct { bool dynamic; bool mapped; }; /** @brief CONNECT_SHARE is a structure that will be shared among all open handlers. This example implements the minimum of what you will probably need. */ class CONNECT_SHARE : public Handler_share { public: mysql_mutex_t mutex; THR_LOCK lock; CONNECT_SHARE() { thr_lock_init(&lock); } ~CONNECT_SHARE() { thr_lock_delete(&lock); mysql_mutex_destroy(&mutex); } }; typedef class ha_connect *PHC; /** @brief Class definition for the storage engine */ class ha_connect: public handler { THR_LOCK_DATA lock; ///< MySQL lock CONNECT_SHARE *share; ///< Shared lock info CONNECT_SHARE *get_share(); protected: char *PlugSubAllocStr(PGLOBAL g, void *memp, const char *str, size_t length) { char *ptr= (char*)PlgDBSubAlloc(g, memp, length + 1); if (ptr) { memcpy(ptr, str, length); ptr[length]= '\0'; } // endif ptr return ptr; } // end of PlugSubAllocStr public: ha_connect(handlerton *hton, TABLE_SHARE *table_arg); ~ha_connect(); // CONNECT Implementation //static bool connect_init(void); //static bool connect_end(void); TABTYPE GetRealType(PTOS pos= NULL); char *GetRealString(PCSZ s); PCSZ GetStringOption(PCSZ opname, PCSZ sdef= NULL); PTOS GetTableOptionStruct(TABLE_SHARE *s= NULL); bool GetBooleanOption(PCSZ opname, bool bdef); bool SetBooleanOption(PCSZ opname, bool b); int GetIntegerOption(PCSZ opname); bool GetIndexOption(KEY *kp, PCSZ opname); bool CheckString(PCSZ str1, PCSZ str2); bool SameString(TABLE *tab, PCSZ opn); bool SetIntegerOption(PCSZ opname, int n); bool SameInt(TABLE *tab, PCSZ opn); bool SameBool(TABLE *tab, PCSZ opn); bool FileExists(const char *fn, bool bf); bool NoFieldOptionChange(TABLE *tab); PFOS GetFieldOptionStruct(Field *fp); void *GetColumnOption(PGLOBAL g, void *field, PCOLINFO pcf); PXOS GetIndexOptionStruct(KEY *kp); PIXDEF GetIndexInfo(TABLE_SHARE *s= NULL); bool CheckVirtualIndex(TABLE_SHARE *s); PCSZ GetDBName(PCSZ name); PCSZ GetTableName(void); char *GetPartName(void); //int GetColNameLen(Field *fp); //char *GetColName(Field *fp); //void AddColName(char *cp, Field *fp); TABLE *GetTable(void) {return table;} bool IsSameIndex(PIXDEF xp1, PIXDEF xp2); bool IsPartitioned(void); bool IsUnique(uint n); PCSZ GetDataPath(void) {return datapath;} bool SetDataPath(PGLOBAL g, PCSZ path); PTDB GetTDB(PGLOBAL g); int OpenTable(PGLOBAL g, bool del= false); bool CheckColumnList(PGLOBAL g); bool IsOpened(void); int CloseTable(PGLOBAL g); int MakeRecord(char *buf); int ScanRecord(PGLOBAL g, const uchar *buf); int CheckRecord(PGLOBAL g, const uchar *oldbuf, const uchar *newbuf); int ReadIndexed(uchar *buf, OPVAL op, const key_range *kr= NULL); bool IsIndexed(Field *fp); bool MakeKeyWhere(PGLOBAL g, PSTRG qry, OPVAL op, char q, const key_range *kr); //inline char *Strz(LEX_STRING &ls); key_range start_key; /** @brief The name that will be used for display purposes. */ const char *table_type() const {return "CONNECT";} /** @brief The name of the index type that will be used for display. Don't implement this method unless you really have indexes. */ const char *index_type(uint inx); /** @brief The file extensions. */ //const char **bas_ext() const; /** Check if a storage engine supports a particular alter table in-place @note Called without holding thr_lock.c lock. */ virtual enum_alter_inplace_result check_if_supported_inplace_alter(TABLE *altered_table, Alter_inplace_info *ha_alter_info); /** @brief This is a list of flags that indicate what functionality the storage engine implements. The current table flags are documented in handler.h */ ulonglong table_flags() const; /** @brief This is a bitmap of flags that indicates how the storage engine implements indexes. The current index flags are documented in handler.h. If you do not implement indexes, just return zero here. @details part is the key part to check. First key part is 0. If all_parts is set, MySQL wants to know the flags for the combined index, up to and including 'part'. */ ulong index_flags(uint inx, uint part, bool all_parts) const; /** @brief unireg.cc will call max_supported_record_length(), max_supported_keys(), max_supported_key_parts(), uint max_supported_key_length() to make sure that the storage engine can handle the data it is about to send. Return *real* limits of your storage engine here; MySQL will do min(your_limits, MySQL_limits) automatically. */ uint max_supported_record_length() const { return HA_MAX_REC_LENGTH; } /** @brief unireg.cc will call this to make sure that the storage engine can handle the data it is about to send. Return *real* limits of your storage engine here; MySQL will do min(your_limits, MySQL_limits) automatically. @details There is no need to implement ..._key_... methods if your engine doesn't support indexes. */ uint max_supported_keys() const { return 10; } /** @brief unireg.cc will call this to make sure that the storage engine can handle the data it is about to send. Return *real* limits of your storage engine here; MySQL will do min(your_limits, MySQL_limits) automatically. @details There is no need to implement ..._key_... methods if your engine doesn't support indexes. */ uint max_supported_key_parts() const { return 10; } /** @brief unireg.cc will call this to make sure that the storage engine can handle the data it is about to send. Return *real* limits of your storage engine here; MySQL will do min(your_limits, MySQL_limits) automatically. @details There is no need to implement ..._key_... methods if your engine doesn't support indexes. */ uint max_supported_key_length() const { return 255; } /** @brief Called in test_quick_select to determine if indexes should be used. */ virtual double scan_time() { return (double) (stats.records+stats.deleted) / 20.0+10; } /** @brief This method will never be called if you do not implement indexes. */ virtual double read_time(uint, uint, ha_rows rows) { return (double) rows / 20.0+1; } /* Everything below are methods that we implement in ha_connect.cc. Most of these methods are not obligatory, skip them and MySQL will treat them as not implemented */ virtual bool get_error_message(int error, String *buf); /** Push condition down to the table handler. @param cond Condition to be pushed. The condition tree must not be modified by the by the caller. @return The 'remainder' condition that caller must use to filter out records. NULL means the handler will not return rows that do not match the passed condition. @note The pushed conditions form a stack (from which one can remove the last pushed condition using cond_pop). The table handler filters out rows using (pushed_cond1 AND pushed_cond2 AND ... AND pushed_condN) or less restrictive condition, depending on handler's capabilities. handler->ha_reset() call empties the condition stack. Calls to rnd_init/rnd_end, index_init/index_end etc do not affect the condition stack. */ virtual const COND *cond_push(const COND *cond); PCFIL CheckCond(PGLOBAL g, PCFIL filp, const Item *cond); const char *GetValStr(OPVAL vop, bool neg); PFIL CondFilter(PGLOBAL g, Item *cond); //PFIL CheckFilter(PGLOBAL g); /** admin commands - called from mysql_admin_table */ virtual int check(THD* thd, HA_CHECK_OPT* check_opt); /** Number of rows in table. It will only be called if (table_flags() & (HA_HAS_RECORDS | HA_STATS_RECORDS_IS_EXACT)) != 0 */ virtual ha_rows records(); /** Type of table for caching query CONNECT should not use caching because its tables are external data prone to me modified out of MariaDB */ virtual uint8 table_cache_type(void) { #if defined(MEMORY_TRACE) // Temporary until bug MDEV-4771 is fixed return HA_CACHE_TBL_NONTRANSACT; #else return HA_CACHE_TBL_NOCACHE; #endif } /** @brief We implement this in ha_connect.cc; it's a required method. */ int open(const char *name, int mode, uint test_if_locked); // required /** @brief We implement this in ha_connect.cc; it's a required method. */ int close(void); // required /** @brief We implement this in ha_connect.cc. It's not an obligatory method; skip it and and MySQL will treat it as not implemented. */ int write_row(uchar *buf); /** @brief We implement this in ha_connect.cc. It's not an obligatory method; skip it and and MySQL will treat it as not implemented. */ int update_row(const uchar *old_data, uchar *new_data); /** @brief We implement this in ha_connect.cc. It's not an obligatory method; skip it and and MySQL will treat it as not implemented. */ int delete_row(const uchar *buf); // Added to the connect handler int index_init(uint idx, bool sorted); int index_end(); int index_read(uchar * buf, const uchar * key, uint key_len, enum ha_rkey_function find_flag); int index_next_same(uchar *buf, const uchar *key, uint keylen); /** @brief We implement this in ha_connect.cc. It's not an obligatory method; skip it and and MySQL will treat it as not implemented. */ //int index_read_map(uchar *buf, const uchar *key, // key_part_map keypart_map, enum ha_rkey_function find_flag); /** @brief We implement this in ha_connect.cc. It's not an obligatory method; skip it and and MySQL will treat it as not implemented. */ int index_next(uchar *buf); /** @brief We implement this in ha_connect.cc. It's not an obligatory method; skip it and and MySQL will treat it as not implemented. */ int index_prev(uchar *buf); /** @brief We implement this in ha_connect.cc. It's not an obligatory method; skip it and and MySQL will treat it as not implemented. */ int index_first(uchar *buf); /** @brief We implement this in ha_connect.cc. It's not an obligatory method; skip it and and MySQL will treat it as not implemented. */ int index_last(uchar *buf); /* Index condition pushdown implementation */ //Item *idx_cond_push(uint keyno, Item* idx_cond); /** @brief Unlike index_init(), rnd_init() can be called two consecutive times without rnd_end() in between (it only makes sense if scan=1). In this case, the second call should prepare for the new table scan (e.g if rnd_init() allocates the cursor, the second call should position the cursor to the start of the table; no need to deallocate and allocate it again. This is a required method. */ int rnd_init(bool scan); //required int rnd_end(); int rnd_next(uchar *buf); ///< required int rnd_pos(uchar *buf, uchar *pos); ///< required void position(const uchar *record); ///< required int info(uint); ///< required int extra(enum ha_extra_function operation); int start_stmt(THD *thd, thr_lock_type lock_type); int external_lock(THD *thd, int lock_type); ///< required int delete_all_rows(void); ha_rows records_in_range(uint inx, key_range *min_key, key_range *max_key); /** These methods can be overridden, but their default implementation provide useful functionality. */ int rename_table(const char *from, const char *to); /** Delete a table in the engine. Called for base as well as temporary tables. */ int delete_table(const char *name); /** Called by delete_table and rename_table */ int delete_or_rename_table(const char *from, const char *to); int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info); ///< required bool check_if_incompatible_data(HA_CREATE_INFO *info, uint table_changes); THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to, enum thr_lock_type lock_type); ///< required int optimize(THD* thd, HA_CHECK_OPT* check_opt); /** * Multi Range Read interface */ int multi_range_read_init(RANGE_SEQ_IF *seq, void *seq_init_param, uint n_ranges, uint mode, HANDLER_BUFFER *buf); int multi_range_read_next(range_id_t *range_info); ha_rows multi_range_read_info_const(uint keyno, RANGE_SEQ_IF *seq, void *seq_init_param, uint n_ranges, uint *bufsz, uint *flags, Cost_estimate *cost); ha_rows multi_range_read_info(uint keyno, uint n_ranges, uint keys, uint key_parts, uint *bufsz, uint *flags, Cost_estimate *cost); int multi_range_read_explain_info(uint mrr_mode, char *str, size_t size); int reset(void) {ds_mrr.dsmrr_close(); return 0;} /* Index condition pushdown implementation */ // Item *idx_cond_push(uint keyno, Item* idx_cond); private: DsMrr_impl ds_mrr; protected: bool check_privileges(THD *thd, PTOS options, char *dbn, bool quick=false); MODE CheckMode(PGLOBAL g, THD *thd, MODE newmode, bool *chk, bool *cras); int check_stmt(PGLOBAL g, MODE newmode, bool cras); char *GetDBfromName(const char *name); // Members static ulong num; // Tracable handler number PCONNECT xp; // To user_connect associated class ulong hnum; // The number of this handler query_id_t valid_query_id; // The one when tdbp was allocated query_id_t creat_query_id; // The one when handler was allocated PCSZ datapath; // Is the Path of DB data directory PTDB tdbp; // To table class object PVAL sdvalin1; // Used to convert date values PVAL sdvalin2; // Used to convert date values PVAL sdvalin3; // Used to convert date values PVAL sdvalin4; // Used to convert date values PVAL sdvalout; // Used to convert date values bool istable; // True for table handler char partname[65]; // The partition name MODE xmod; // Table mode XINFO xinfo; // The table info structure bool valid_info; // True if xinfo is valid bool stop; // Used when creating index bool alter; // True when converting to other engine bool mrr; // True when getting index positions bool nox; // True when index should not be made bool abort; // True after error in UPDATE/DELETE int indexing; // Type of indexing for CONNECT int locked; // Table lock MY_BITMAP *part_id; // Columns used for partition func THR_LOCK_DATA lock_data; public: TABLE_SHARE *tshp; // Used by called tables char *data_file_name; char *index_file_name; uint int_table_flags; // Inherited from MyISAM bool enable_activate_all_index; // Inherited from MyISAM }; // end of ha_connect class definition