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Update to bug 685 fix: http://bugs.mariadb.com/show_bug.cgi?id=685

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Fixed results sets not being processed as a set of multiple packets.
This commit is contained in:
Markus Makela
2015-01-12 18:51:27 +02:00
parent 333f79f4db
commit c7362cec23
1 changed files with 139 additions and 99 deletions
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236
server/modules/filter/tee.c
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@ -61,6 +61,7 @@
#include <sys/time.h>
#include <poll.h>
#include <mysql_client_server_protocol.h>
#include <housekeeper.h>
#define MYSQL_COM_QUIT 0x01
#define MYSQL_COM_INITDB 0x02
@ -76,6 +77,10 @@
#define REPLY_TIMEOUT_MILLISECOND 1
#define PARENT 0
#define CHILD 1
#define PTR_IS_RESULTSET(b) (b[0] == 0x01 && b[1] == 0x0 && b[2] == 0x0 && b[3] == 0x01)
#define PTR_IS_EOF(b) (b[4] == 0xfe)
static unsigned char required_packets[] = {
MYSQL_COM_QUIT,
MYSQL_COM_INITDB,
@ -155,10 +160,9 @@ typedef struct {
FILTER_DEF* dummy_filterdef;
int active; /* filter is active? */
int waiting; /* if the client is waiting for a reply */
bool waiting[2]; /* if the client is waiting for a reply */
int eof[2];
int replies[2]; /* Number of queries received */
int min_replies; /* Minimum number of replies to receive
* before forwarding the packet to the client*/
DCB *branch_dcb; /* Client DCB for "branch" service */
SESSION *branch_session;/* The branch service session */
int n_duped; /* Number of duplicated queries */
@ -166,7 +170,6 @@ typedef struct {
int residual; /* Any outstanding SQL text */
GWBUF* tee_replybuf; /* Buffer for reply */
SPINLOCK tee_lock;
long bytes_left[2];
} TEE_SESSION;
typedef struct orphan_session_tt
@ -205,6 +208,83 @@ static int hcfn(
return strcmp(i1,i2);
}
static void
orphan_free(void* data)
{
spinlock_acquire(&orphanLock);
orphan_session_t *ptr = allOrphans, *finished = NULL, *tmp = NULL;
#ifdef SS_DEBUG
int o_stopping = 0, o_ready = 0, o_freed = 0;
#endif
while(ptr)
{
if(ptr->session->state == SESSION_STATE_TO_BE_FREED)
{
if(ptr == allOrphans)
{
tmp = ptr;
allOrphans = ptr->next;
}
else
{
tmp = allOrphans;
while(tmp && tmp->next != ptr)
tmp = tmp->next;
if(tmp)
{
tmp->next = ptr->next;
tmp = ptr;
}
}
}
#ifdef SS_DEBUG
else if(ptr->session->state == SESSION_STATE_STOPPING)
{
o_stopping++;
}
else if(ptr->session->state == SESSION_STATE_ROUTER_READY)
{
o_ready++;
}
#endif
ptr = ptr->next;
if(tmp)
{
tmp->next = finished;
finished = tmp;
tmp = NULL;
}
}
spinlock_release(&orphanLock);
#ifdef SS_DEBUG
if(o_stopping + o_ready > 0)
skygw_log_write(LOGFILE_DEBUG, "tee.c: %d orphans in "
"SESSION_STATE_STOPPING, %d orphans in "
"SESSION_STATE_ROUTER_READY. ", o_stopping, o_ready);
#endif
while(finished)
{
o_freed++;
tmp = finished;
finished = finished->next;
tmp->session->service->router->freeSession(
tmp->session->service->router_instance,
tmp->session->router_session);
tmp->session->state = SESSION_STATE_FREE;
free(tmp->session);
free(tmp);
}
#ifdef SS_DEBUG
skygw_log_write(LOGFILE_DEBUG, "tee.c: %d orphans freed.", o_freed);
#endif
}
/**
* Implementation of the mandatory version entry point
*
@ -224,6 +304,7 @@ void
ModuleInit()
{
spinlock_init(&orphanLock);
hktask_add("tee orphan cleanup",orphan_free,NULL,15);
}
/**
@ -493,7 +574,6 @@ char *remote, *userName;
}
ses->tail = *dummy_upstream;
my_session->min_replies = 2;
my_session->branch_session = ses;
my_session->branch_dcb = dcb;
my_session->dummy_filterdef = dummy;
@ -608,78 +688,6 @@ SESSION* ses = my_session->branch_session;
}
free(session);
spinlock_acquire(&orphanLock);
orphan_session_t *ptr = allOrphans, *finished = NULL,*tmp = NULL;
#ifdef SS_DEBUG
int o_stopping = 0, o_ready = 0,o_freed = 0;
#endif
while(ptr)
{
if(ptr->session->state == SESSION_STATE_TO_BE_FREED)
{
if(ptr == allOrphans)
{
tmp = ptr;
allOrphans = ptr->next;
}
else
{
tmp = allOrphans;
while(tmp && tmp->next != ptr)
tmp = tmp->next;
if(tmp)
{
tmp->next = ptr->next;
tmp = ptr;
}
}
}
#ifdef SS_DEBUG
else if(ptr->session->state == SESSION_STATE_STOPPING)
{
o_stopping++;
}
else if(ptr->session->state == SESSION_STATE_ROUTER_READY)
{
o_ready++;
}
#endif
ptr = ptr->next;
if(tmp)
{
tmp->next = finished;
finished = tmp;
tmp = NULL;
}
}
spinlock_release(&orphanLock);
#ifdef SS_DEBUG
if(o_stopping + o_ready > 0)
skygw_log_write(LOGFILE_DEBUG,"tee.c: %d orphans in "
"SESSION_STATE_STOPPING, %d orphans in "
"SESSION_STATE_ROUTER_READY. ",o_stopping,o_ready);
#endif
while(finished)
{
#ifdef SS_DEBUG
skygw_log_write(LOGFILE_DEBUG,"tee.c: %d orphans freed.",++o_freed);
#endif
tmp = finished;
finished = finished->next;
tmp->session->service->router->freeSession(
tmp->session->service->router_instance,
tmp->session->router_session);
tmp->session->state = SESSION_STATE_FREE;
free(tmp->session);
free(tmp);
}
return;
}
/**
@ -779,10 +787,11 @@ GWBUF *clone = NULL;
ss_dassert(my_session->tee_replybuf == NULL);
memset(my_session->bytes_left,0,2*sizeof(long));
memset(my_session->replies,0,2*sizeof(int));
ss_dassert(my_session->tee_replybuf == NULL);
rval = my_session->down.routeQuery(my_session->down.instance,
memset(my_session->eof,0,2*sizeof(int));
memset(my_session->waiting,0,2*sizeof(bool));
rval = my_session->down.routeQuery(my_session->down.instance,
my_session->down.session,
queue);
if (clone)
@ -818,7 +827,38 @@ GWBUF *clone = NULL;
return rval;
}
#define BOTH_REPLIED(s) (s->replies[PARENT] > 0 && s->replies[CHILD] > 0)
/**
* Scans the GWBUF for EOF packets. If two packets for this session have been found
* from either the parent or the child branch, mark the response set from that branch as over.
* @param session The Tee filter session
* @param branch Parent or child branch
* @param reply Buffer to scan
*/
void
scan_resultset(TEE_SESSION *session, int branch, GWBUF *reply)
{
unsigned char* ptr = (unsigned char*) reply->start;
unsigned char* end = (unsigned char*) reply->end;
int pktlen = 0;
while(ptr < end)
{
pktlen = gw_mysql_get_byte3(ptr) + 4;
if(PTR_IS_EOF(ptr))
{
session->eof[branch]++;
if(session->eof[branch] == 2)
{
session->waiting[branch] = false;
session->eof[branch] = 0;
return;
}
}
ptr += pktlen;
}
}
/**
* The clientReply entry point. This is passed the response buffer
@ -833,46 +873,46 @@ GWBUF *clone = NULL;
static int
clientReply (FILTER* instance, void *session, GWBUF *reply)
{
int rc, replies, branch;
long n_bytes_missing, len;
int rc, branch;
TEE_SESSION *my_session = (TEE_SESSION *) session;
spinlock_acquire(&my_session->tee_lock);
ss_dassert(my_session->active);
len = gwbuf_length(reply);
branch = instance == NULL ? CHILD : PARENT;
unsigned char *ptr = (unsigned char*)reply->start;
if(my_session->replies[branch] == 0)
{
long pklen = MYSQL_GET_PACKET_LEN((uint8_t *) GWBUF_DATA(reply)) + 4;
my_session->bytes_left[branch] = pklen;
if(PTR_IS_RESULTSET(ptr))
{
my_session->waiting[branch] = true;
my_session->eof[branch] = 0;
}
}
my_session->bytes_left[branch] -= len;
my_session->replies[branch]++;
n_bytes_missing = MAX(my_session->bytes_left[PARENT],0) +
MAX(my_session->bytes_left[CHILD],0);
replies = my_session->replies[PARENT] + my_session->replies[CHILD];
if(my_session->waiting[branch])
{
scan_resultset(my_session,branch,reply);
}
if(branch == PARENT)
{
my_session->tee_replybuf = my_session->tee_replybuf == NULL ?
reply : gwbuf_append(my_session->tee_replybuf,reply);
ss_dassert(my_session->tee_replybuf == NULL)
my_session->tee_replybuf = reply;
}
else
{
gwbuf_free(reply);
}
my_session->replies[branch]++;
if(my_session->tee_replybuf != NULL &&
if(my_session->tee_replybuf != NULL &&
(my_session->branch_session == NULL ||
(n_bytes_missing == 0 && BOTH_REPLIED(my_session)) ||
my_session->bytes_left[PARENT] > 0))
my_session->waiting[PARENT] ||
(!my_session->waiting[CHILD] && !my_session->waiting[PARENT])))
{
rc = my_session->up.clientReply (
my_session->up.instance,