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Refactor auxiliary routing functions

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Refactored some of the functions used to calculate servers. Removed
redundant checks and moved the ack_write() call to the right place.
This commit is contained in:
Markus Mäkelä
2017-06-15 20:30:11 +03:00
parent 1f31cfdfd7
commit b48bb4fc5e
3 changed files with 26 additions and 36 deletions
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54
server/modules/routing/readwritesplit/readwritesplit.cc
View File

@ -102,11 +102,10 @@ static const MXS_ENUM_VALUE master_failure_mode_values[] =
* @param rses Router client session
* @param router_nservers The number of backend servers in total
*/
int rses_get_max_slavecount(ROUTER_CLIENT_SES *rses,
int router_nservers)
int rses_get_max_slavecount(ROUTER_CLIENT_SES *rses)
{
int conf_max_nslaves;
int max_nslaves;
int router_nservers = rses->rses_nbackends;
CHK_CLIENT_RSES(rses);
@ -118,9 +117,8 @@ int rses_get_max_slavecount(ROUTER_CLIENT_SES *rses,
{
conf_max_nslaves = (router_nservers * rses->rses_config.rw_max_slave_conn_percent) / 100;
}
max_nslaves = MXS_MIN(router_nservers - 1, MXS_MAX(1, conf_max_nslaves));
return max_nslaves;
return MXS_MIN(router_nservers - 1, MXS_MAX(1, conf_max_nslaves));
}
/*
@ -474,7 +472,7 @@ static bool handle_error_new_connection(ROUTER_INSTANCE *inst,
/** Close the current connection */
bref->close();
int max_nslaves = rses_get_max_slavecount(myrses, myrses->rses_nbackends);
int max_nslaves = rses_get_max_slavecount(myrses);
bool succp;
/**
* Try to get replacement slave or at least the minimum
@ -796,10 +794,11 @@ static MXS_ROUTER_SESSION *newSession(MXS_ROUTER *router_inst, MXS_SESSION *sess
}
}
int max_nslaves = rses_get_max_slavecount(client_rses, router_nservers);
client_rses->rses_nbackends = router_nservers; /*< # of backend servers */
int max_nslaves = rses_get_max_slavecount(client_rses);
if (!select_connect_backend_servers(router_nservers, max_nslaves,
client_rses->rses_config.slave_selection_criteria,
session, router, client_rses, false))
@ -1122,7 +1121,8 @@ static void clientReply(MXS_ROUTER *instance,
if (reply_is_complete(bref, writebuf))
{
/** Got a complete reply, decrement expected response count */
/** Got a complete reply, acknowledge the write decrement expected response count */
bref->ack_write();
router_cli_ses->expected_responses--;
ss_dassert(router_cli_ses->expected_responses >= 0);
ss_dassert(bref->get_reply_state() == REPLY_STATE_DONE);
@ -1140,33 +1140,23 @@ static void clientReply(MXS_ROUTER *instance,
{
check_session_command_reply(writebuf, bref);
if (GWBUF_IS_TYPE_SESCMD_RESPONSE(writebuf))
{
/**
* Discard all those responses that have already been sent to
* the client. Return with buffer including response that
* needs to be sent to client or NULL.
*/
bool rconn = false;
process_sescmd_response(router_cli_ses, bref, &writebuf, &rconn);
/** This discards all responses that have already been sent to the client */
bool rconn = false;
process_sescmd_response(router_cli_ses, bref, &writebuf, &rconn);
if (rconn && !router_inst->rwsplit_config.disable_sescmd_history)
{
select_connect_backend_servers(
router_cli_ses->rses_nbackends,
router_cli_ses->rses_config.max_slave_connections,
router_cli_ses->rses_config.slave_selection_criteria,
router_cli_ses->client_dcb->session,
router_cli_ses->router,
router_cli_ses,
true);
}
if (rconn && !router_inst->rwsplit_config.disable_sescmd_history)
{
select_connect_backend_servers(
router_cli_ses->rses_nbackends,
router_cli_ses->rses_config.max_slave_connections,
router_cli_ses->rses_config.slave_selection_criteria,
router_cli_ses->client_dcb->session,
router_cli_ses->router,
router_cli_ses,
true);
}
}
/** Complete the write */
bref->ack_write();
bool queue_routed = false;
if (router_cli_ses->expected_responses == 0)

2
server/modules/routing/readwritesplit/rwsplit_internal.hh
View File

@ -52,7 +52,7 @@ bool send_readonly_error(DCB *dcb);
*/
int router_handle_state_switch(DCB *dcb, DCB_REASON reason, void *data);
SRWBackend& get_bref_from_dcb(ROUTER_CLIENT_SES *rses, DCB *dcb);
int rses_get_max_slavecount(ROUTER_CLIENT_SES *rses, int router_nservers);
int rses_get_max_slavecount(ROUTER_CLIENT_SES *rses);
int rses_get_max_replication_lag(ROUTER_CLIENT_SES *rses);
/*

6
server/modules/routing/readwritesplit/rwsplit_select_backends.cc
View File

@ -79,8 +79,8 @@ static bool valid_for_slave(const SERVER *server, const SERVER *master_host)
* @param cmpfun qsort() compatible comparison function
* @return The best slave backend reference or NULL if no candidates could be found
*/
SRWBackend* get_slave_candidate(ROUTER_CLIENT_SES* rses, const SERVER *master,
int (*cmpfun)(const void *, const void *))
SRWBackend get_slave_candidate(ROUTER_CLIENT_SES* rses, const SERVER *master,
int (*cmpfun)(const void *, const void *))
{
SRWBackend candidate;
@ -210,7 +210,7 @@ bool select_connect_backend_servers(int router_nservers,
ss_dassert(slaves_connected < max_nslaves || max_nslaves == 0);
/** Connect to all possible slaves */
for (SRWBackend bref(get_slave_candidate(rses, router_nservers, master_host, cmpfun));
for (SRWBackend bref(get_slave_candidate(rses, master_host, cmpfun));
bref && slaves_connected < max_nslaves;
bref = get_slave_candidate(rses, master_host, cmpfun))
{