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protocol.h
#ifndef PROTOCOL_INCLUDED #define PROTOCOL_INCLUDED /* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. Copyright (c) 2020, MariaDB Corporation. 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 St, Fifth Floor, Boston, MA 02110-1335 USA */ #ifdef USE_PRAGMA_INTERFACE #pragma interface /* gcc class implementation */ #endif #include "sql_error.h" #include "my_decimal.h" /* my_decimal */ #include "sql_type.h" class i_string; class Field; class Send_field; class THD; class Item_param; struct TABLE_LIST; typedef struct st_mysql_field MYSQL_FIELD; typedef struct st_mysql_rows MYSQL_ROWS; class Protocol { protected: String *packet; /* Used by net_store_data() for charset conversions */ String *convert; uint field_pos; #ifndef DBUG_OFF const Type_handler **field_handlers; bool valid_handler(uint pos, protocol_send_type_t type) const { return field_handlers == 0 || field_handlers[field_pos]->protocol_send_type() == type; } #endif uint field_count; virtual bool net_store_data(const uchar *from, size_t length); virtual bool net_store_data_cs(const uchar *from, size_t length, CHARSET_INFO *fromcs, CHARSET_INFO *tocs); virtual bool net_send_ok(THD *, uint, uint, ulonglong, ulonglong, const char *, bool); virtual bool net_send_error_packet(THD *, uint, const char *, const char *); #ifdef EMBEDDED_LIBRARY char **next_field; MYSQL_FIELD *next_mysql_field; MEM_ROOT *alloc; #endif bool needs_conversion(CHARSET_INFO *fromcs, CHARSET_INFO *tocs) const { // 'tocs' is set 0 when client issues SET character_set_results=NULL return tocs && !my_charset_same(fromcs, tocs) && fromcs != &my_charset_bin && tocs != &my_charset_bin; } /* The following two are low-level functions that are invoked from higher-level store_xxx() funcs. The data is stored into this->packet. */ bool store_string_aux(const char *from, size_t length, CHARSET_INFO *fromcs, CHARSET_INFO *tocs); virtual bool send_ok(uint server_status, uint statement_warn_count, ulonglong affected_rows, ulonglong last_insert_id, const char *message); virtual bool send_eof(uint server_status, uint statement_warn_count); virtual bool send_error(uint sql_errno, const char *err_msg, const char *sql_state); CHARSET_INFO *character_set_results() const; public: THD *thd; Protocol(THD *thd_arg) { init(thd_arg); } virtual ~Protocol() = default; void init(THD* thd_arg); enum { SEND_NUM_ROWS= 1, SEND_EOF= 2, SEND_FORCE_COLUMN_INFO= 4 }; virtual bool send_result_set_metadata(List<Item> *list, uint flags); bool send_list_fields(List<Field> *list, const TABLE_LIST *table_list); bool send_result_set_row(List<Item> *row_items); bool store(I_List<i_string> *str_list); bool store_string_or_null(const char *from, CHARSET_INFO *cs); bool store_warning(const char *from, size_t length); String *storage_packet() { return packet; } inline void free() { packet->free(); } virtual bool write(); inline bool store(int from) { return store_long((longlong) from); } inline bool store(uint32 from) { return store_long((longlong) from); } inline bool store(longlong from) { return store_longlong((longlong) from, 0); } inline bool store(ulonglong from) { return store_longlong((longlong) from, 1); } inline bool store(String *str) { return store((char*) str->ptr(), str->length(), str->charset()); } inline bool store(const LEX_CSTRING *from, CHARSET_INFO *cs) { return store(from->str, from->length, cs); } virtual bool prepare_for_send(uint num_columns) { field_count= num_columns; return 0; } virtual bool flush(); virtual void end_partial_result_set(THD *thd); virtual void prepare_for_resend()=0; virtual bool store_null()=0; virtual bool store_tiny(longlong from)=0; virtual bool store_short(longlong from)=0; virtual bool store_long(longlong from)=0; virtual bool store_longlong(longlong from, bool unsigned_flag)=0; virtual bool store_decimal(const my_decimal *)=0; virtual bool store_str(const char *from, size_t length, CHARSET_INFO *fromcs, CHARSET_INFO *tocs)=0; virtual bool store_float(float from, uint32 decimals)=0; virtual bool store_double(double from, uint32 decimals)=0; virtual bool store_datetime(MYSQL_TIME *time, int decimals)=0; virtual bool store_date(MYSQL_TIME *time)=0; virtual bool store_time(MYSQL_TIME *time, int decimals)=0; virtual bool store(Field *field)=0; // Various useful wrappers for the virtual store*() methods. // Backward wrapper for store_str() bool store(const char *from, size_t length, CHARSET_INFO *cs) { return store_str(from, length, cs, character_set_results()); } bool store_lex_cstring(const LEX_CSTRING &s, CHARSET_INFO *fromcs, CHARSET_INFO *tocs) { return store_str(s.str, (uint) s.length, fromcs, tocs); } bool store_binary_string(const char *str, size_t length) { return store_str(str, (uint) length, &my_charset_bin, &my_charset_bin); } bool store_ident(const LEX_CSTRING &s) { return store_lex_cstring(s, system_charset_info, character_set_results()); } // End of wrappers virtual bool send_out_parameters(List<Item_param> *sp_params)=0; #ifdef EMBEDDED_LIBRARY bool begin_dataset(); bool begin_dataset(THD *thd, uint numfields); virtual void remove_last_row() {} #else void remove_last_row() {} #endif enum enum_protocol_type { /* Before adding a new type, please make sure there is enough storage for it in Query_cache_query_flags. */ PROTOCOL_TEXT= 0, PROTOCOL_BINARY= 1, PROTOCOL_LOCAL= 2, PROTOCOL_DISCARD= 3 /* Should be last, not used by Query_cache */ }; virtual enum enum_protocol_type type()= 0; virtual bool net_send_eof(THD *thd, uint server_status, uint statement_warn_count); bool net_send_error(THD *thd, uint sql_errno, const char *err, const char* sqlstate); void end_statement(); }; /** Class used for the old (MySQL 4.0 protocol). */ class Protocol_text :public Protocol { StringBuffer<FLOATING_POINT_BUFFER> buffer; bool store_numeric_string_aux(const char *from, size_t length); public: Protocol_text(THD *thd_arg, ulong prealloc= 0) :Protocol(thd_arg) { if (prealloc) packet->alloc(prealloc); } void prepare_for_resend() override; bool store_null() override; bool store_tiny(longlong from) override; bool store_short(longlong from) override; bool store_long(longlong from) override; bool store_longlong(longlong from, bool unsigned_flag) override; bool store_decimal(const my_decimal *) override; bool store_str(const char *from, size_t length, CHARSET_INFO *fromcs, CHARSET_INFO *tocs) override; bool store_datetime(MYSQL_TIME *time, int decimals) override; bool store_date(MYSQL_TIME *time) override; bool store_time(MYSQL_TIME *time, int decimals) override; bool store_float(float nr, uint32 decimals) override; bool store_double(double from, uint32 decimals) override; bool store(Field *field) override; bool send_out_parameters(List<Item_param> *sp_params) override; bool store_numeric_zerofill_str(const char *from, size_t length, protocol_send_type_t send_type); #ifdef EMBEDDED_LIBRARY void remove_last_row() override; #endif bool store_field_metadata(const THD *thd, const Send_field &field, CHARSET_INFO *charset_for_protocol, uint pos); bool store_item_metadata(THD *thd, Item *item, uint pos); bool store_field_metadata_for_list_fields(const THD *thd, Field *field, const TABLE_LIST *table_list, uint pos); enum enum_protocol_type type() override { return PROTOCOL_TEXT; }; }; class Protocol_binary final :public Protocol { private: uint bit_fields; public: Protocol_binary(THD *thd_arg) :Protocol(thd_arg) {} bool prepare_for_send(uint num_columns) override; void prepare_for_resend() override; #ifdef EMBEDDED_LIBRARY bool write() override; bool net_store_data(const uchar *from, size_t length) override; bool net_store_data_cs(const uchar *from, size_t length, CHARSET_INFO *fromcs, CHARSET_INFO *tocs) override; #endif bool store_null() override; bool store_tiny(longlong from) override; bool store_short(longlong from) override; bool store_long(longlong from) override; bool store_longlong(longlong from, bool unsigned_flag) override; bool store_decimal(const my_decimal *) override; bool store_str(const char *from, size_t length, CHARSET_INFO *fromcs, CHARSET_INFO *tocs) override; bool store_datetime(MYSQL_TIME *time, int decimals) override; bool store_date(MYSQL_TIME *time) override; bool store_time(MYSQL_TIME *time, int decimals) override; bool store_float(float nr, uint32 decimals) override; bool store_double(double from, uint32 decimals) override; bool store(Field *field) override; bool send_out_parameters(List<Item_param> *sp_params) override; enum enum_protocol_type type() override { return PROTOCOL_BINARY; }; }; /* A helper for "ANALYZE $stmt" which looks a real network procotol but doesn't write results to the network. At first glance, class select_send looks like a more appropriate place to implement the "write nothing" hook. This is not true, because - we need to evaluate the value of every item, and do it the way select_send does it (i.e. call item->val_int() or val_real() or...) - select_send::send_data() has some other code, like telling the storage engine that the row can be unlocked. We want to keep that also. as a result, "ANALYZE $stmt" uses a select_send_analyze which still uses select_send::send_data() & co., and also uses Protocol_discard object. */ class Protocol_discard final : public Protocol { public: Protocol_discard(THD *thd_arg) : Protocol(thd_arg) {} bool write() override { return 0; } bool send_result_set_metadata(List<Item> *, uint) override { return 0; } bool send_eof(uint, uint) override { return 0; } void prepare_for_resend() override { IF_DBUG(field_pos= 0,); } bool send_out_parameters(List<Item_param> *sp_params) override { return false; } /* Provide dummy overrides for any storage methods so that we avoid allocating and copying of data */ bool store_null() override { return false; } bool store_tiny(longlong) override { return false; } bool store_short(longlong) override { return false; } bool store_long(longlong) override { return false; } bool store_longlong(longlong, bool) override { return false; } bool store_decimal(const my_decimal *) override { return false; } bool store_str(const char *, size_t, CHARSET_INFO *, CHARSET_INFO *) override { return false; } bool store_datetime(MYSQL_TIME *, int) override { return false; } bool store_date(MYSQL_TIME *) override { return false; } bool store_time(MYSQL_TIME *, int) override { return false; } bool store_float(float, uint32) override { return false; } bool store_double(double, uint32) override { return false; } bool store(Field *) override { return false; } enum enum_protocol_type type() override { return PROTOCOL_DISCARD; }; }; void send_warning(THD *thd, uint sql_errno, const char *err=0); void net_send_progress_packet(THD *thd); uchar *net_store_data(uchar *to,const uchar *from, size_t length); uchar *net_store_data(uchar *to,int32 from); uchar *net_store_data(uchar *to,longlong from); #endif /* PROTOCOL_INCLUDED */
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