diff options
Diffstat (limited to 'sql/rpl_utility.h')
| -rw-r--r-- | sql/rpl_utility.h | 193 |
1 files changed, 178 insertions, 15 deletions
diff --git a/sql/rpl_utility.h b/sql/rpl_utility.h index 17879a9ecfc..26edbdd1405 100644 --- a/sql/rpl_utility.h +++ b/sql/rpl_utility.h @@ -22,11 +22,8 @@ #include "mysql_priv.h" -struct st_relay_log_info; -typedef st_relay_log_info RELAY_LOG_INFO; +class Relay_log_info; -uint32 -field_length_from_packed(enum_field_types field_type, byte const *data); /** A table definition from the master. @@ -57,19 +54,100 @@ public: @param types Array of types @param size Number of elements in array 'types' + @param field_metadata Array of extra information about fields + @param metadata_size Size of the field_metadata array + @param null_bitmap The bitmap of fields that can be null */ - table_def(field_type *types, my_size_t size) - : m_type(new unsigned char [size]), m_size(size) + table_def(field_type *types, ulong size, uchar *field_metadata, + int metadata_size, uchar *null_bitmap) + : m_size(size), m_type(0), m_field_metadata_size(metadata_size), + m_field_metadata(0), m_null_bits(0), m_memory(NULL) { + m_memory= (uchar *)my_multi_malloc(MYF(MY_WME), + &m_type, size, + &m_field_metadata, + size * sizeof(uint16), + &m_null_bits, (size + 7) / 8, + NULL); + + bzero(m_field_metadata, size * sizeof(uint16)); + if (m_type) memcpy(m_type, types, size); else m_size= 0; + /* + Extract the data from the table map into the field metadata array + iff there is field metadata. The variable metadata_size will be + 0 if we are replicating from an older version server since no field + metadata was written to the table map. This can also happen if + there were no fields in the master that needed extra metadata. + */ + if (m_size && metadata_size) + { + int index= 0; + for (unsigned int i= 0; i < m_size; i++) + { + switch (m_type[i]) { + case MYSQL_TYPE_TINY_BLOB: + case MYSQL_TYPE_BLOB: + case MYSQL_TYPE_MEDIUM_BLOB: + case MYSQL_TYPE_LONG_BLOB: + case MYSQL_TYPE_DOUBLE: + case MYSQL_TYPE_FLOAT: + { + /* + These types store a single byte. + */ + m_field_metadata[i]= (uchar)field_metadata[index]; + index++; + break; + } + case MYSQL_TYPE_SET: + case MYSQL_TYPE_ENUM: + case MYSQL_TYPE_STRING: + { + short int x= field_metadata[index++] << 8U; // real_type + x = x + field_metadata[index++]; // pack or field length + m_field_metadata[i]= x; + break; + } + case MYSQL_TYPE_BIT: + { + short int x= field_metadata[index++]; + x = x + (field_metadata[index++] << 8U); + m_field_metadata[i]= x; + break; + } + case MYSQL_TYPE_VARCHAR: + { + /* + These types store two bytes. + */ + char *ptr= (char *)&field_metadata[index]; + m_field_metadata[i]= sint2korr(ptr); + index= index + 2; + break; + } + case MYSQL_TYPE_NEWDECIMAL: + { + short int x= field_metadata[index++] << 8U; // precision + x = x + field_metadata[index++]; // decimals + m_field_metadata[i]= x; + break; + } + default: + m_field_metadata[i]= 0; + break; + } + } + } + if (m_size && null_bitmap) + memcpy(m_null_bits, null_bitmap, (m_size + 7) / 8); } ~table_def() { - if (m_type) - delete [] m_type; + my_free(m_memory, MYF(0)); #ifndef DBUG_OFF m_type= 0; m_size= 0; @@ -81,7 +159,7 @@ public: @return The number of fields that there is type data for. */ - my_size_t size() const { return m_size; } + ulong size() const { return m_size; } /* @@ -93,13 +171,54 @@ public: <code>index</code>. Currently, only the type identifier is returned. */ - field_type type(my_ptrdiff_t index) const + field_type type(ulong index) const { - DBUG_ASSERT(0 <= index); - DBUG_ASSERT(static_cast<my_size_t>(index) < m_size); + DBUG_ASSERT(index < m_size); return m_type[index]; } + + /* + This function allows callers to get the extra field data from the + table map for a given field. If there is no metadata for that field + or there is no extra metadata at all, the function returns 0. + + The function returns the value for the field metadata for column at + position indicated by index. As mentioned, if the field was a type + that stores field metadata, that value is returned else zero (0) is + returned. This method is used in the unpack() methods of the + corresponding fields to properly extract the data from the binary log + in the event that the master's field is smaller than the slave. + */ + uint16 field_metadata(uint index) const + { + DBUG_ASSERT(index < m_size); + if (m_field_metadata_size) + return m_field_metadata[index]; + else + return 0; + } + + /* + This function returns whether the field on the master can be null. + This value is derived from field->maybe_null(). + */ + my_bool maybe_null(uint index) const + { + DBUG_ASSERT(index < m_size); + return ((m_null_bits[(index / 8)] & + (1 << (index % 8))) == (1 << (index %8))); + } + + /* + This function returns the field size in raw bytes based on the type + and the encoded field data from the master's raw data. This method can + be used for situations where the slave needs to skip a column (e.g., + WL#3915) or needs to advance the pointer for the fields in the raw + data from the master to a specific column. + */ + uint32 calc_field_size(uint col, uchar *master_data) const; + /** Decide if the table definition is compatible with a table. @@ -117,11 +236,15 @@ public: @retval 1 if the table definition is not compatible with @c table @retval 0 if the table definition is compatible with @c table */ - int compatible_with(RELAY_LOG_INFO const *rli, TABLE *table) const; + int compatible_with(Relay_log_info const *rli, TABLE *table) const; private: - my_size_t m_size; // Number of elements in the types array + ulong m_size; // Number of elements in the types array field_type *m_type; // Array of type descriptors + uint m_field_metadata_size; + uint16 *m_field_metadata; + uchar *m_null_bits; + uchar *m_memory; }; /** @@ -129,10 +252,50 @@ private: slave thread, but nowhere else. */ struct RPL_TABLE_LIST - : public st_table_list + : public TABLE_LIST { bool m_tabledef_valid; table_def m_tabledef; }; + +/* Anonymous namespace for template functions/classes */ +namespace { + + /* + Smart pointer that will automatically call my_afree (a macro) when + the pointer goes out of scope. This is used so that I do not have + to remember to call my_afree() before each return. There is no + overhead associated with this, since all functions are inline. + + I (Matz) would prefer to use the free function as a template + parameter, but that is not possible when the "function" is a + macro. + */ + template <class Obj> + class auto_afree_ptr + { + Obj* m_ptr; + public: + auto_afree_ptr(Obj* ptr) : m_ptr(ptr) { } + ~auto_afree_ptr() { if (m_ptr) my_afree(m_ptr); } + void assign(Obj* ptr) { + /* Only to be called if it hasn't been given a value before. */ + DBUG_ASSERT(m_ptr == NULL); + m_ptr= ptr; + } + Obj* get() { return m_ptr; } + }; + +} + +#define DBUG_PRINT_BITSET(N,FRM,BS) \ + do { \ + char buf[256]; \ + for (uint i = 0 ; i < (BS)->n_bits ; ++i) \ + buf[i] = bitmap_is_set((BS), i) ? '1' : '0'; \ + buf[(BS)->n_bits] = '\0'; \ + DBUG_PRINT((N), ((FRM), buf)); \ + } while (0) + #endif /* RPL_UTILITY_H */ |