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be5a46a69b
sql/rpl_rli.cc: Adding variable to mark an instance of Relay_log_info as fake. sql/rpl_rli.h: Adding variable to mark an instance of Relay_log_info as fake. sql/slave.cc: Not printing debug information if we are working with a fake instance of Relay_log_info. This because the result of calling update is nonsense, and trying to print it generates valgrind warnings. sql/sql_binlog.cc: Marking newly created instance of Relay_log_info as a fake instance.
240 lines
7.5 KiB
C++
240 lines
7.5 KiB
C++
/* Copyright (C) 2005-2006 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "mysql_priv.h"
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#include "rpl_rli.h"
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#include "base64.h"
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/**
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Execute a BINLOG statement
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To execute the BINLOG command properly the server needs to know
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which format the BINLOG command's event is in. Therefore, the first
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BINLOG statement seen must be a base64 encoding of the
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Format_description_log_event, as outputted by mysqlbinlog. This
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Format_description_log_event is cached in
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rli->description_event_for_exec.
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*/
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void mysql_client_binlog_statement(THD* thd)
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{
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DBUG_ENTER("mysql_client_binlog_statement");
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DBUG_PRINT("info",("binlog base64: '%*s'",
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(int) (thd->lex->comment.length < 2048 ?
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thd->lex->comment.length : 2048),
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thd->lex->comment.str));
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if (check_global_access(thd, SUPER_ACL))
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DBUG_VOID_RETURN;
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size_t coded_len= thd->lex->comment.length + 1;
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size_t decoded_len= base64_needed_decoded_length(coded_len);
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DBUG_ASSERT(coded_len > 0);
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/*
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Allocation
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*/
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/*
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If we do not have a Format_description_event, we create a dummy
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one here. In this case, the first event we read must be a
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Format_description_event.
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*/
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my_bool have_fd_event= TRUE;
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if (!thd->rli_fake)
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{
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thd->rli_fake= new Relay_log_info;
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#ifdef HAVE_purify
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thd->rli_fake->is_fake= TRUE;
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#endif
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have_fd_event= FALSE;
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}
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if (thd->rli_fake && !thd->rli_fake->relay_log.description_event_for_exec)
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{
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thd->rli_fake->relay_log.description_event_for_exec=
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new Format_description_log_event(4);
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have_fd_event= FALSE;
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}
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const char *error= 0;
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char *buf= (char *) my_malloc(decoded_len, MYF(MY_WME));
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Log_event *ev = 0;
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/*
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Out of memory check
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*/
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if (!(thd->rli_fake &&
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thd->rli_fake->relay_log.description_event_for_exec &&
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buf))
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{
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my_error(ER_OUTOFMEMORY, MYF(0), 1); /* needed 1 bytes */
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goto end;
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}
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thd->rli_fake->sql_thd= thd;
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thd->rli_fake->no_storage= TRUE;
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for (char const *strptr= thd->lex->comment.str ;
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strptr < thd->lex->comment.str + thd->lex->comment.length ; )
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{
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char const *endptr= 0;
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int bytes_decoded= base64_decode(strptr, coded_len, buf, &endptr);
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#ifndef HAVE_purify
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/*
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This debug printout should not be used for valgrind builds
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since it will read from unassigned memory.
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*/
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DBUG_PRINT("info",
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("bytes_decoded: %d strptr: 0x%lx endptr: 0x%lx ('%c':%d)",
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bytes_decoded, (long) strptr, (long) endptr, *endptr,
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*endptr));
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#endif
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if (bytes_decoded < 0)
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{
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my_error(ER_BASE64_DECODE_ERROR, MYF(0));
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goto end;
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}
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else if (bytes_decoded == 0)
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break; // If no bytes where read, the string contained only whitespace
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DBUG_ASSERT(bytes_decoded > 0);
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DBUG_ASSERT(endptr > strptr);
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coded_len-= endptr - strptr;
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strptr= endptr;
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/*
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Now we have one or more events stored in the buffer. The size of
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the buffer is computed based on how much base64-encoded data
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there were, so there should be ample space for the data (maybe
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even too much, since a statement can consist of a considerable
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number of events).
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TODO: Switch to use a stream-based base64 encoder/decoder in
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order to be able to read exactly what is necessary.
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*/
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DBUG_PRINT("info",("binlog base64 decoded_len: %lu bytes_decoded: %d",
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(ulong) decoded_len, bytes_decoded));
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/*
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Now we start to read events of the buffer, until there are no
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more.
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*/
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for (char *bufptr= buf ; bytes_decoded > 0 ; )
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{
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/*
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Checking that the first event in the buffer is not truncated.
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*/
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ulong event_len= uint4korr(bufptr + EVENT_LEN_OFFSET);
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DBUG_PRINT("info", ("event_len=%lu, bytes_decoded=%d",
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event_len, bytes_decoded));
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if (bytes_decoded < EVENT_LEN_OFFSET || (uint) bytes_decoded < event_len)
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{
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my_error(ER_SYNTAX_ERROR, MYF(0));
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goto end;
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}
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/*
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If we have not seen any Format_description_event, then we must
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see one; it is the only statement that can be read in base64
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without a prior Format_description_event.
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*/
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if (!have_fd_event)
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{
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if (bufptr[EVENT_TYPE_OFFSET] == FORMAT_DESCRIPTION_EVENT)
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have_fd_event= TRUE;
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else
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{
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my_error(ER_NO_FORMAT_DESCRIPTION_EVENT_BEFORE_BINLOG_STATEMENT,
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MYF(0),
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Log_event::get_type_str(
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(Log_event_type)bufptr[EVENT_TYPE_OFFSET]));
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goto end;
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}
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}
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ev= Log_event::read_log_event(bufptr, event_len, &error,
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thd->rli_fake->relay_log.
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description_event_for_exec);
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DBUG_PRINT("info",("binlog base64 err=%s", error));
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if (!ev)
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{
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/*
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This could actually be an out-of-memory, but it is more likely
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causes by a bad statement
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*/
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my_error(ER_SYNTAX_ERROR, MYF(0));
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goto end;
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}
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bytes_decoded -= event_len;
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bufptr += event_len;
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DBUG_PRINT("info",("ev->get_type_code()=%d", ev->get_type_code()));
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#ifndef HAVE_purify
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/*
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This debug printout should not be used for valgrind builds
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since it will read from unassigned memory.
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*/
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DBUG_PRINT("info",("bufptr+EVENT_TYPE_OFFSET: 0x%lx",
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(long) (bufptr+EVENT_TYPE_OFFSET)));
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DBUG_PRINT("info", ("bytes_decoded: %d bufptr: 0x%lx buf[EVENT_LEN_OFFSET]: %lu",
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bytes_decoded, (long) bufptr,
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(ulong) uint4korr(bufptr+EVENT_LEN_OFFSET)));
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#endif
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ev->thd= thd;
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/*
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We go directly to the application phase, since we don't need
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to check if the event shall be skipped or not.
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Neither do we have to update the log positions, since that is
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not used at all: the rli_fake instance is used only for error
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reporting.
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*/
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#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
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if (apply_event_and_update_pos(ev, thd, thd->rli_fake, FALSE))
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{
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/*
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TODO: Maybe a better error message since the BINLOG statement
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now contains several events.
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*/
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my_error(ER_UNKNOWN_ERROR, MYF(0), "Error executing BINLOG statement");
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goto end;
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}
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#endif
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/*
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Format_description_log_event should not be deleted because it
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will be used to read info about the relay log's format; it
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will be deleted when the SQL thread does not need it,
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i.e. when this thread terminates.
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*/
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if (ev->get_type_code() != FORMAT_DESCRIPTION_EVENT)
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delete ev;
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ev= 0;
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}
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}
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DBUG_PRINT("info",("binlog base64 execution finished successfully"));
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send_ok(thd);
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end:
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my_free(buf, MYF(MY_ALLOW_ZERO_PTR));
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DBUG_VOID_RETURN;
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}
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