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Refactor Backend class states

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The states are now internal to the Backend class. This simplifies the use
of the class by moving the burder of state tracking to the class
itself.

Refactored the way the schemarouter uses the Backend class.

Also fixed a memory leak in the schemarouter when `ignore_databases_regex`
was used..
This commit is contained in:
Markus Mäkelä
2017-06-13 22:36:08 +03:00
parent bbfd9ce136
commit 18993bc8ca
3 changed files with 137 additions and 102 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
server/modules/routing/schemarouter/schemaroutersession.cc
View File

@ -97,9 +97,13 @@ void SchemaRouterSession::close()
for (SSRBackendList::iterator it = m_backends.begin(); it != m_backends.end(); it++)
{
SSRBackend& bref = *it;
/** The backends are closed here to trigger the shutdown of
* the connected DCBs */
(*it)->close();
if (bref->in_use())
{
bref->close();
}
}
spinlock_acquire(&m_router->m_lock);
@ -434,20 +438,19 @@ int32_t SchemaRouterSession::routeQuery(GWBUF* pPacket)
pPacket = NULL;
ret = 1;
}
else if ((ret = target_dcb->func.write(target_dcb, gwbuf_clone(pPacket))) == 1)
else if (bref->write(pPacket))
{
/** Add one query response waiter to backend reference */
bref->set_state(BREF_QUERY_ACTIVE);
bref->set_state(BREF_WAITING_RESULT);
atomic_add(&m_router->m_stats.n_queries, 1);
ret = 1;
}
else
{
MXS_ERROR("Routing query failed.");
gwbuf_free(pPacket);
}
}
gwbuf_free(pPacket);
return ret;
}
void SchemaRouterSession::handle_mapping_reply(SSRBackend& bref, GWBUF** pPacket)
@ -506,17 +509,6 @@ void SchemaRouterSession::process_sescmd_response(SSRBackend& bref, GWBUF** ppPa
*ppPacket = NULL;
}
}
if (*ppPacket)
{
bref->clear_state(BREF_WAITING_RESULT);
}
}
else if (bref->is_query_active())
{
bref->clear_state(BREF_QUERY_ACTIVE);
/** Set response status as replied */
bref->clear_state(BREF_WAITING_RESULT);
}
}
@ -565,6 +557,10 @@ void SchemaRouterSession::clientReply(GWBUF* pPacket, DCB* pDcb)
{
process_sescmd_response(bref, &pPacket);
ss_dassert(bref->is_waiting_result());
/** Set response status as replied */
bref->ack_write();
if (pPacket)
{
MXS_SESSION_ROUTE_REPLY(pDcb->session, pPacket);
@ -579,8 +575,6 @@ void SchemaRouterSession::clientReply(GWBUF* pPacket, DCB* pDcb)
else if (bref->write_stored_command())
{
atomic_add(&m_router->m_stats.n_queries, 1);
bref->set_state(BREF_QUERY_ACTIVE);
bref->set_state(BREF_WAITING_RESULT);
}
}
@ -744,19 +738,6 @@ bool SchemaRouterSession::route_session_write(GWBUF* querybuf, uint8_t command)
if ((*it)->session_command_count() == 1)
{
/** Only one command, execute it */
switch (command)
{
/** These types of commands don't generate responses */
case MYSQL_COM_QUIT:
case MYSQL_COM_STMT_CLOSE:
break;
default:
(*it)->set_state(BREF_WAITING_RESULT);
break;
}
if ((*it)->execute_session_command())
{
succp = true;
@ -781,6 +762,7 @@ bool SchemaRouterSession::route_session_write(GWBUF* querybuf, uint8_t command)
}
}
gwbuf_free(querybuf);
return succp;
}
@ -1246,6 +1228,8 @@ bool SchemaRouterSession::ignore_duplicate_database(const char* data)
{
rval = true;
}
pcre2_match_data_free(match_data);
}
return rval;