| Current File : //usr/include/mysql/server/private/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 */