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Clean up route target resolution function

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Cleaned up the function that resolves to which type of a server the query
should go.
This commit is contained in:
Markus Mäkelä
2017-06-29 09:22:22 +03:00
parent dd05b44d38
commit f7500cce9e
1 changed files with 18 additions and 20 deletions
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38
server/modules/routing/readwritesplit/rwsplit_route_stmt.cc
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@ -545,7 +545,7 @@ SRWBackend get_target_backend(RWSplitSession *rses, backend_type_t btype,
* if the query would otherwise be routed to slave.
*/
route_target_t get_route_target(RWSplitSession *rses, uint8_t command,
uint32_t qtype, HINT *hint)
uint32_t qtype, HINT *query_hints)
{
bool trx_active = session_trx_is_active(rses->client_dcb->session);
bool load_active = rses->load_data_state != LOAD_DATA_INACTIVE;
@ -556,6 +556,9 @@ route_target_t get_route_target(RWSplitSession *rses, uint8_t command,
{
target = TARGET_MASTER;
}
/**
* Prepared statements preparations should go to all servers
*/
else if (qc_query_is_type(qtype, QUERY_TYPE_PREPARE_STMT) ||
qc_query_is_type(qtype, QUERY_TYPE_PREPARE_NAMED_STMT) ||
command == MYSQL_COM_STMT_CLOSE ||
@ -564,7 +567,7 @@ route_target_t get_route_target(RWSplitSession *rses, uint8_t command,
target = TARGET_ALL;
}
/**
* These queries are not affected by hints
* These queries should be routed to all servers
*/
else if (!load_active &&
(qc_query_is_type(qtype, QUERY_TYPE_SESSION_WRITE) ||
@ -640,7 +643,7 @@ route_target_t get_route_target(RWSplitSession *rses, uint8_t command,
}
else if (session_trx_is_read_only(rses->client_dcb->session))
{
/* Force TARGET_SLAVE for READ ONLY tranaction (active or ending) */
/* Force TARGET_SLAVE for READ ONLY transaction (active or ending) */
target = TARGET_SLAVE;
}
else
@ -673,14 +676,13 @@ route_target_t get_route_target(RWSplitSession *rses, uint8_t command,
target = TARGET_MASTER;
}
/** process routing hints */
while (hint != NULL)
/** Process routing hints */
for (HINT* hint = query_hints; hint; hint = hint->next)
{
if (hint->type == HINT_ROUTE_TO_MASTER)
{
target = TARGET_MASTER; /*< override */
MXS_DEBUG("%lu [get_route_target] Hint: route to master.",
pthread_self());
MXS_DEBUG("Hint: route to master");
break;
}
else if (hint->type == HINT_ROUTE_TO_NAMED_SERVER)
@ -690,42 +692,38 @@ route_target_t get_route_target(RWSplitSession *rses, uint8_t command,
* found, the oroginal target is chosen.
*/
target |= TARGET_NAMED_SERVER;
MXS_DEBUG("%lu [get_route_target] Hint: route to "
"named server : ",
pthread_self());
MXS_DEBUG("Hint: route to named server: %s", (char*)hint->data);
}
else if (hint->type == HINT_ROUTE_TO_UPTODATE_SERVER)
{
/** not implemented */
ss_dassert(false);
}
else if (hint->type == HINT_ROUTE_TO_ALL)
{
/** not implemented */
ss_dassert(false);
}
else if (hint->type == HINT_PARAMETER)
{
if (strncasecmp((char *)hint->data, "max_slave_replication_lag",
if (strncasecmp((char*)hint->data, "max_slave_replication_lag",
strlen("max_slave_replication_lag")) == 0)
{
target |= TARGET_RLAG_MAX;
}
else
{
MXS_ERROR("Unknown hint parameter "
"'%s' when 'max_slave_replication_lag' "
"was expected.",
(char *)hint->data);
MXS_ERROR("Unknown hint parameter '%s' when "
"'max_slave_replication_lag' was expected.",
(char*)hint->data);
}
}
else if (hint->type == HINT_ROUTE_TO_SLAVE)
{
target = TARGET_SLAVE;
MXS_DEBUG("%lu [get_route_target] Hint: route to "
"slave.",
pthread_self());
MXS_DEBUG("Hint: route to slave.");
}
hint = hint->next;
} /*< while (hint != NULL) */
}
return (route_target_t)target;
}