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MDEV-34705: Binlog in Engine

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Initial code to read in the binlog dump thread events from InnoDB binlog.

Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>
This commit is contained in:
Kristian Nielsen
2024-08-07 16:12:15 +02:00
parent 219f643ba0
commit 75c334a9f8
8 changed files with 181 additions and 19 deletions
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64
sql/handler.cc
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@@ -9158,3 +9158,67 @@ void handler::set_optimizer_costs(THD *thd)
optimizer_where_cost= thd->variables.optimizer_where_cost;
optimizer_scan_setup_cost= thd->variables.optimizer_scan_setup_cost;
}
int handler_binlog_reader::read_log_event(String *packet, uint32_t ev_offset,
size_t max_allowed)
{
uint32_t sofar= 0;
bool header_read= false;
uint32_t target_size= EVENT_LEN_OFFSET + 4;
int res;
/*
Loop, first reading the "length" field, and then continuing to read data
until a full event has been placed in the packet.
*/
for (;;)
{
if (buf_data_remain <= 0)
{
res= read_binlog_data(buf, sizeof(buf));
if (res <= 0)
{
res= (res < 0 ? LOG_READ_IO : LOG_READ_EOF);
goto err;
}
buf_data_pos= 0;
buf_data_remain= res;
}
uint32_t amount= std::min(target_size - sofar, buf_data_remain);
packet->append((char *)buf + buf_data_pos, amount);
buf_data_pos+= amount;
buf_data_remain-= amount;
sofar+= amount;
if (target_size == sofar)
{
if (header_read)
break;
else
{
header_read= true;
target_size= uint4korr(&((*packet)[EVENT_LEN_OFFSET + ev_offset]));
if (target_size < LOG_EVENT_MINIMAL_HEADER_LEN)
{
res= LOG_READ_BOGUS;
goto err;
}
else if (target_size > max_allowed)
{
res= LOG_READ_TOO_LARGE;
goto err;
}
/*
Note that here we rely on the fact that all valid events have more
data after the length. This way we avoid conditional for the
(useless) special case where we don't need to read anything more
after having read the first part.
*/
DBUG_ASSERT(LOG_EVENT_MINIMAL_HEADER_LEN > EVENT_LEN_OFFSET+4);
}
}
}
res= 0; /* Success */
err:
return res;
}