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Extended session command support to cover COM_CHANGE_USER, and COM_INIT_DB.

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This implementation doesn't guarantee execution order between session commands and queries
if other backend server lags behind in session command execution.

In poll.c : moved processing of EPOLLERR and EPOLLHUP after processing of EPOLLIN and EPOLLOUT.
This ensures that COM_QUIT messages are read and routed forward before signals arrive (from local client/backend).
This commit is contained in:
VilhoRaatikka
2014-03-14 13:25:37 +02:00
parent cb6a976555
commit a3f7eebdc9
8 changed files with 233 additions and 293 deletions
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38
server/modules/protocol/mysql_backend.c
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@ -283,6 +283,8 @@ static int gw_read_backend_event(DCB *dcb) {
}
if (backend_protocol->state == MYSQL_AUTH_FAILED) {
spinlock_acquire(&dcb->delayqlock);
/*<
* vraa : errorHandle
* check the delayq before the reply
@ -295,10 +297,12 @@ static int gw_read_backend_event(DCB *dcb) {
0,
"Connection to backend lost.");
// consume all the delay queue
dcb->delayq = gwbuf_consume(
while ((dcb->delayq = gwbuf_consume(
dcb->delayq,
gwbuf_length(dcb->delayq));
GWBUF_LENGTH(dcb->delayq))) != NULL);
}
spinlock_release(&dcb->delayqlock);
while (session->state != SESSION_STATE_ROUTER_READY)
{
@ -347,7 +351,7 @@ static int gw_read_backend_event(DCB *dcb) {
pthread_self(),
dcb->fd,
current_session->user)));
/* check the delay queue and flush the data */
if (dcb->delayq)
{
@ -802,12 +806,6 @@ static int backend_write_delayqueue(DCB *dcb)
localq = dcb->delayq;
dcb->delayq = NULL;
/*<
* Now we set the last command received, from the delayed queue
*/
// memcpy(&dcb->command, &localq->command, sizeof(dcb->command));
spinlock_release(&dcb->delayqlock);
rc = dcb_write(dcb, localq);
@ -856,8 +854,6 @@ static int gw_change_user(DCB *backend, SERVER *server, SESSION *in_session, GWB
backend_protocol = backend->protocol;
client_protocol = in_session->client->protocol;
// queue->command = ROUTER_CHANGE_SESSION;
// now get the user, after 4 bytes header and 1 byte command
client_auth_packet += 5;
strcpy(username, (char *)client_auth_packet);
@ -899,30 +895,14 @@ static int gw_change_user(DCB *backend, SERVER *server, SESSION *in_session, GWB
rv = gw_send_change_user_to_backend(database, username, client_sha1, backend_protocol);
/*<
* The current queue was not handled by func.write() in gw_send_change_user_to_backend()
* We wrote a new gwbuf
* Set backend command here!
*/
memcpy(&backend->command, &queue->command, sizeof(backend->command));
/*<
* Now copy new data into user session
*/
strcpy(current_session->user, username);
strcpy(current_session->db, database);
memcpy(current_session->client_sha1, client_sha1, sizeof(current_session->client_sha1));
}
// consume all the data received from client
spinlock_acquire(&backend->writeqlock);
len = gwbuf_length(queue);
queue = gwbuf_consume(queue, len);
spinlock_release(&backend->writeqlock);
}
gwbuf_free(queue);
return rv;
}