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Diffstat (limited to '')
| -rw-r--r-- | sql/rpl_utility.cc | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/sql/rpl_utility.cc b/sql/rpl_utility.cc new file mode 100644 index 00000000..04a2efb3 --- /dev/null +++ b/sql/rpl_utility.cc @@ -0,0 +1,344 @@ +/* Copyright (c) 2006, 2013, Oracle and/or its affiliates. + Copyright (c) 2011, 2013, Monty Program 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 St, Fifth Floor, Boston, MA 02110-1335 USA */ + +#include "mariadb.h" +#include <my_bit.h> +#include "rpl_utility.h" +#include "log_event.h" + + +/********************************************************************* + * table_def member definitions * + *********************************************************************/ + +/* + This function returns the field size in raw bytes based on the type + and the encoded field data from the master's raw data. +*/ +uint32 table_def::calc_field_size(uint col, uchar *master_data) const +{ + uint32 length= 0; + + switch (type(col)) { + case MYSQL_TYPE_NEWDECIMAL: + length= my_decimal_get_binary_size(m_field_metadata[col] >> 8, + m_field_metadata[col] & 0xff); + break; + case MYSQL_TYPE_DECIMAL: + case MYSQL_TYPE_FLOAT: + case MYSQL_TYPE_DOUBLE: + length= m_field_metadata[col]; + break; + /* + The cases for SET and ENUM are include for completeness, however + both are mapped to type MYSQL_TYPE_STRING and their real types + are encoded in the field metadata. + */ + case MYSQL_TYPE_SET: + case MYSQL_TYPE_ENUM: + case MYSQL_TYPE_STRING: + { + uchar type= m_field_metadata[col] >> 8U; + if ((type == MYSQL_TYPE_SET) || (type == MYSQL_TYPE_ENUM)) + length= m_field_metadata[col] & 0x00ff; + else + { + /* + We are reading the actual size from the master_data record + because this field has the actual lengh stored in the first + byte. + */ + length= (uint) *master_data + 1; + DBUG_ASSERT(length != 0); + } + break; + } + case MYSQL_TYPE_YEAR: + case MYSQL_TYPE_TINY: + length= 1; + break; + case MYSQL_TYPE_SHORT: + length= 2; + break; + case MYSQL_TYPE_INT24: + length= 3; + break; + case MYSQL_TYPE_LONG: + length= 4; + break; +#ifdef HAVE_LONG_LONG + case MYSQL_TYPE_LONGLONG: + length= 8; + break; +#endif + case MYSQL_TYPE_NULL: + length= 0; + break; + case MYSQL_TYPE_NEWDATE: + length= 3; + break; + case MYSQL_TYPE_DATE: + case MYSQL_TYPE_TIME: + length= 3; + break; + case MYSQL_TYPE_TIME2: + length= my_time_binary_length(m_field_metadata[col]); + break; + case MYSQL_TYPE_TIMESTAMP: + length= 4; + break; + case MYSQL_TYPE_TIMESTAMP2: + length= my_timestamp_binary_length(m_field_metadata[col]); + break; + case MYSQL_TYPE_DATETIME: + length= 8; + break; + case MYSQL_TYPE_DATETIME2: + length= my_datetime_binary_length(m_field_metadata[col]); + break; + case MYSQL_TYPE_BIT: + { + /* + Decode the size of the bit field from the master. + from_len is the length in bytes from the master + from_bit_len is the number of extra bits stored in the master record + If from_bit_len is not 0, add 1 to the length to account for accurate + number of bytes needed. + */ + uint from_len= (m_field_metadata[col] >> 8U) & 0x00ff; + uint from_bit_len= m_field_metadata[col] & 0x00ff; + DBUG_ASSERT(from_bit_len <= 7); + length= from_len + ((from_bit_len > 0) ? 1 : 0); + break; + } + case MYSQL_TYPE_VARCHAR: + case MYSQL_TYPE_VARCHAR_COMPRESSED: + { + length= m_field_metadata[col] > 255 ? 2 : 1; // c&p of Field_varstring::data_length() + length+= length == 1 ? (uint32) *master_data : uint2korr(master_data); + break; + } + case MYSQL_TYPE_TINY_BLOB: + case MYSQL_TYPE_MEDIUM_BLOB: + case MYSQL_TYPE_LONG_BLOB: + case MYSQL_TYPE_BLOB: + case MYSQL_TYPE_BLOB_COMPRESSED: + case MYSQL_TYPE_GEOMETRY: + { + /* + Compute the length of the data. We cannot use get_length() here + since it is dependent on the specific table (and also checks the + packlength using the internal 'table' pointer) and replication + is using a fixed format for storing data in the binlog. + */ + switch (m_field_metadata[col]) { + case 1: + length= *master_data; + break; + case 2: + length= uint2korr(master_data); + break; + case 3: + length= uint3korr(master_data); + break; + case 4: + length= uint4korr(master_data); + break; + default: + DBUG_ASSERT(0); // Should not come here + break; + } + + length+= m_field_metadata[col]; + break; + } + default: + length= ~(uint32) 0; + } + return length; +} + +PSI_memory_key key_memory_table_def_memory; + +table_def::table_def(unsigned char *types, ulong size, + uchar *field_metadata, int metadata_size, + uchar *null_bitmap, uint16 flags) + : m_size(size), m_type(0), m_field_metadata_size(metadata_size), + m_field_metadata(0), m_null_bits(0), m_flags(flags), + m_memory(NULL) +{ + m_memory= (uchar *)my_multi_malloc(key_memory_table_def_memory, 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 (binlog_type(i)) { + case MYSQL_TYPE_TINY_BLOB: + case MYSQL_TYPE_BLOB: + case MYSQL_TYPE_BLOB_COMPRESSED: + case MYSQL_TYPE_MEDIUM_BLOB: + case MYSQL_TYPE_LONG_BLOB: + case MYSQL_TYPE_DOUBLE: + case MYSQL_TYPE_FLOAT: + case MYSQL_TYPE_GEOMETRY: + { + /* + These types store a single byte. + */ + m_field_metadata[i]= field_metadata[index]; + index++; + break; + } + case MYSQL_TYPE_SET: + case MYSQL_TYPE_ENUM: + case MYSQL_TYPE_STRING: + { + uint16 x= field_metadata[index++] << 8U; // real_type + x+= field_metadata[index++]; // pack or field length + m_field_metadata[i]= x; + break; + } + case MYSQL_TYPE_BIT: + { + uint16 x= field_metadata[index++]; + x = x + (field_metadata[index++] << 8U); + m_field_metadata[i]= x; + break; + } + case MYSQL_TYPE_VARCHAR: + case MYSQL_TYPE_VARCHAR_COMPRESSED: + { + /* + These types store two bytes. + */ + char *ptr= (char *)&field_metadata[index]; + m_field_metadata[i]= uint2korr(ptr); + index= index + 2; + break; + } + case MYSQL_TYPE_NEWDECIMAL: + { + uint16 x= field_metadata[index++] << 8U; // precision + x+= field_metadata[index++]; // decimals + m_field_metadata[i]= x; + break; + } + case MYSQL_TYPE_TIME2: + case MYSQL_TYPE_DATETIME2: + case MYSQL_TYPE_TIMESTAMP2: + m_field_metadata[i]= field_metadata[index++]; + 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::~table_def() +{ + my_free(m_memory); +#ifndef DBUG_OFF + m_type= 0; + m_size= 0; +#endif +} + + +/** + @param even_buf point to the buffer containing serialized event + @param event_len length of the event accounting possible checksum alg + + @return TRUE if test fails + FALSE as success + + @notes + event_buf will have same values on return. However during the process of + caluclating the checksum, it's temporary changed. Because of this the + event_buf argument is not a pointer to const. + +*/ +bool event_checksum_test(uchar *event_buf, ulong event_len, + enum enum_binlog_checksum_alg alg) +{ + bool res= FALSE; + uint16 flags= 0; // to store in FD's buffer flags orig value + + if (alg != BINLOG_CHECKSUM_ALG_OFF && alg != BINLOG_CHECKSUM_ALG_UNDEF) + { + ha_checksum incoming; + ha_checksum computed; + + if (event_buf[EVENT_TYPE_OFFSET] == FORMAT_DESCRIPTION_EVENT) + { +#ifdef DBUG_ASSERT_EXISTS + int8 fd_alg= event_buf[event_len - BINLOG_CHECKSUM_LEN - + BINLOG_CHECKSUM_ALG_DESC_LEN]; +#endif + /* + FD event is checksummed and therefore verified w/o the binlog-in-use flag + */ + flags= uint2korr(event_buf + FLAGS_OFFSET); + if (flags & LOG_EVENT_BINLOG_IN_USE_F) + event_buf[FLAGS_OFFSET] &= ~LOG_EVENT_BINLOG_IN_USE_F; + /* + The only algorithm currently is CRC32. Zero indicates + the binlog file is checksum-free *except* the FD-event. + */ + DBUG_ASSERT(fd_alg == BINLOG_CHECKSUM_ALG_CRC32 || fd_alg == 0); + DBUG_ASSERT(alg == BINLOG_CHECKSUM_ALG_CRC32); + /* + Complile time guard to watch over the max number of alg + */ + compile_time_assert(BINLOG_CHECKSUM_ALG_ENUM_END <= 0x80); + } + incoming= uint4korr(event_buf + event_len - BINLOG_CHECKSUM_LEN); + /* checksum the event content without the checksum part itself */ + computed= my_checksum(0, event_buf, event_len - BINLOG_CHECKSUM_LEN); + if (flags != 0) + { + /* restoring the orig value of flags of FD */ + DBUG_ASSERT(event_buf[EVENT_TYPE_OFFSET] == FORMAT_DESCRIPTION_EVENT); + event_buf[FLAGS_OFFSET]= (uchar) flags; + } + res= (DBUG_IF("simulate_checksum_test_failure") || computed != incoming); + } + return res; +} |