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Fix multi-statement execution in readwritesplit

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A multi-statements can return multiple resultsets in one response. To
accommodate for this, both the readwritesplit and modutil code must be
altered.

By ignoring complete resultsets in readwritesplit, the code can deduce
whether a result is complete or not.
This commit is contained in:
Markus Mäkelä
2017-10-10 08:25:18 +03:00
parent d9922ac895
commit 42cb6bbff7
2 changed files with 28 additions and 10 deletions
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20
server/modules/routing/readwritesplit/readwritesplit.cc
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@ -537,6 +537,16 @@ bool reply_is_complete(SRWBackend& backend, GWBUF *buffer)
LOG_RS(backend, REPLY_STATE_DONE);
backend->set_reply_state(REPLY_STATE_DONE);
}
else
{
// This is an OK packet and more results will follow
ss_dassert(mxs_mysql_is_ok_packet(buffer) &&
mxs_mysql_more_results_after_ok(buffer));
LOG_RS(backend, REPLY_STATE_RSET_COLDEF);
backend->set_reply_state(REPLY_STATE_RSET_COLDEF);
return reply_is_complete(backend, buffer);
}
}
else
{
@ -546,6 +556,16 @@ bool reply_is_complete(SRWBackend& backend, GWBUF *buffer)
int n_eof = modutil_count_signal_packets(buffer, n_old_eof, &more, &state);
backend->set_large_packet(state.state);
if (n_eof > 2)
{
/**
* We have multiple results in the buffer, we only care about
* the state of the last one. Skip the complete result sets and act
* like we're processing a single result set.
*/
n_eof = n_eof % 2 ? 1 : 2;
}
if (n_eof == 0)
{
/** Waiting for the EOF packet after the column definitions */