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MXS-2196: Preload DCB entry points in Listener

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By loading the entry points required by a DCB when the Listener is
created, the extra cost of finding the module is removed. It also
simplifies DCB creation by removing the possibility of all failures to
load modules at DCB creation time.
This commit is contained in:
Markus Mäkelä
2018-11-30 12:41:12 +02:00
parent c858f7f080
commit 9c679edea6
3 changed files with 40 additions and 64 deletions
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33
server/core/dcb.cc
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@ -2390,11 +2390,8 @@ int dcb_connect_SSL(DCB* dcb)
DCB* dcb_accept(DCB* dcb)
{
DCB* client_dcb = NULL;
MXS_PROTOCOL* protocol_funcs = &dcb->func;
int c_sock;
int sendbuf;
struct sockaddr_storage client_conn;
socklen_t optlen = sizeof(sendbuf);
if ((c_sock = dcb_accept_one_connection(dcb, (struct sockaddr*)&client_conn)) >= 0)
{
@ -2402,7 +2399,7 @@ DCB* dcb_accept(DCB* dcb)
configure_network_socket(c_sock, client_conn.ss_family);
client_dcb = dcb_alloc(DCB_ROLE_CLIENT_HANDLER, dcb->listener, dcb->service);
client_dcb = dcb_alloc(DCB_ROLE_CLIENT_HANDLER, dcb->listener, dcb->listener->service());
if (client_dcb == NULL)
{
@ -2411,10 +2408,7 @@ DCB* dcb_accept(DCB* dcb)
}
else
{
const char* authenticator_name = "NullAuthDeny";
MXS_AUTHENTICATOR* authfuncs;
client_dcb->service = dcb->session->service;
client_dcb->service = dcb->listener->service();
client_dcb->session = session_set_dummy(client_dcb);
client_dcb->fd = c_sock;
@ -2452,27 +2446,8 @@ DCB* dcb_accept(DCB* dcb)
}
}
memcpy(&client_dcb->func, protocol_funcs, sizeof(MXS_PROTOCOL));
if (*dcb->listener->authenticator())
{
authenticator_name = dcb->listener->authenticator();
}
else if (client_dcb->func.auth_default != NULL)
{
authenticator_name = client_dcb->func.auth_default();
}
if ((authfuncs = (MXS_AUTHENTICATOR*)load_module(authenticator_name,
MODULE_AUTHENTICATOR)) == NULL)
{
if ((authfuncs = (MXS_AUTHENTICATOR*)load_module("NullAuthDeny",
MODULE_AUTHENTICATOR)) == NULL)
{
MXS_ERROR("Failed to load authenticator module '%s'", authenticator_name);
dcb_close(client_dcb);
return NULL;
}
}
memcpy(&(client_dcb->authfunc), authfuncs, sizeof(MXS_AUTHENTICATOR));
client_dcb->func = dcb->listener->protocol_func();
client_dcb->authfunc = dcb->listener->auth_func();
/** Allocate DCB specific authentication data */
if (client_dcb->authfunc.create