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Related to bug #217, added command 'fail accept <errno>' to debug client's commands.

Browse Source 
Reproduce #217 by connecting with telnet to debug client interface and execute command:

fail accept 23

and try to execute read query, for example, with

mysql -h 127.0.0.1 -P 4008 -u maxuser -pmaxpwd -e 'select current_user(), @@server_id'
This commit is contained in:
vraatikka 2013-09-24 15:04:12 +03:00
parent 3b3d3dbfe0
commit a7c3cd5f30
4 changed files with 234 additions and 183 deletions
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2
server/core/gateway.c
View File

@ -216,6 +216,8 @@ memset(dcb_fake_write_errno, 0, sizeof(unsigned char)*1024);
memset(dcb_fake_write_ev, 0, sizeof(__int32_t)*1024);
fail_next_backend_fd = false;
fail_next_client_fd = false;
fail_next_accept = false;
fail_accept_errno = 0;
#endif
l = atexit(skygw_logmanager_exit);

2
server/include/dcb.h
View File

@ -190,6 +190,8 @@ unsigned char dcb_fake_write_errno[1024];
__int32_t dcb_fake_write_ev[1024];
bool fail_next_backend_fd;
bool fail_next_client_fd;
bool fail_next_accept;
int fail_accept_errno;
#endif
/* A few useful macros */

330
server/modules/protocol/mysql_client.c
View File

@ -127,7 +127,11 @@ mysql_send_ok(DCB *dcb, int packet_number, int in_affected_rows, const char* mys
affected_rows = in_affected_rows;
mysql_payload_size = sizeof(field_count) + sizeof(affected_rows) + sizeof(insert_id) + sizeof(mysql_server_status) + sizeof(mysql_warning_count);
mysql_payload_size = sizeof(field_count) +
sizeof(affected_rows) +
sizeof(insert_id) +
sizeof(mysql_server_status) +
sizeof(mysql_warning_count);
if (mysql_message != NULL) {
mysql_payload_size += strlen(mysql_message);
@ -513,7 +517,6 @@ int gw_read_client_event(DCB* dcb) {
int rc = 0;
CHK_DCB(dcb);
protocol = DCB_PROTOCOL(dcb, MySQLProtocol);
CHK_PROTOCOL(protocol);
/**
@ -611,7 +614,6 @@ int gw_read_client_event(DCB* dcb) {
* Read all the data that is available into a chain of buffers
*/
{
/* int len; */
GWBUF *queue = NULL;
GWBUF *gw_buffer = NULL;
uint8_t *ptr_buff = NULL;
@ -639,34 +641,20 @@ int gw_read_client_event(DCB* dcb) {
/* Now, we are assuming in the first buffer there is
* the information form mysql command */
queue = gw_buffer;
/* len = GWBUF_LENGTH(queue); */
ptr_buff = GWBUF_DATA(queue);
/* get mysql commang at fifth byte */
if (ptr_buff) {
mysql_command = ptr_buff[4];
}
if (mysql_command == '\x03') {
/**
* SQL Trace here.
* Length can be calculated and it must be passed as
* argument.
*/
/* this is a standard MySQL query !!!! */
}
/**
* Routing Client input to Backend
* Without rsession there is no access to backend.
* COM_QUIT : close client dcb
* else : write custom error to client dcb.
*/
/* Do not route the query without session! */
if(rsession == NULL) {
/** COM_QUIT */
if (mysql_command == '\x01') {
/**
* COM_QUIT handling
*
* fprintf(stderr, "COM_QUIT received with
* no connected backends from %i\n", dcb->fd);
*/
skygw_log_write_flush(
LOGFILE_DEBUG,
"%lu [gw_read_client_event] Client read "
@ -682,63 +670,52 @@ int gw_read_client_event(DCB* dcb) {
dcb,
1,
0,
"Connection to backend lost");
"Query routing failed. Connection to "
"backend lost");
protocol->state = MYSQL_IDLE;
}
rc = 1;
goto return_rc;
}
/* We can route the query */
/* COM_QUIT handling */
/** Route COM_QUIT to backend */
if (mysql_command == '\x01') {
skygw_log_write_flush(
LOGFILE_DEBUG,
"%lu [gw_read_client_event] Before routeQuery. "
"dcb %p.",
pthread_self(),
dcb);
/**
* fprintf(stderr, "COM_QUIT received from %i and
* passed to backed\n", dcb->fd);
* this will propagate COM_QUIT to backend(s)
* fprintf(stderr, "<<< Routing the COM_QUIT ...\n");
*/
router->routeQuery(router_instance, rsession, queue);
skygw_log_write_flush(
LOGFILE_DEBUG,
"%lu [gw_read_client_event] After routeQuery. "
"dcb %p.",
"%lu [gw_read_client_event] Routed COM_QUIT to "
"backend. Close client dcb %p",
pthread_self(),
dcb);
/* close client connection */
(dcb->func).close(dcb);
/** close client connection */
(dcb->func).close(dcb);
rc = 1;
goto return_rc;
}
/* MySQL Command Routing */
protocol->state = MYSQL_ROUTING;
/* writing in the backend buffer queue, via routeQuery */
//fprintf(stderr, "<<< Routing the Query ...\n");
rc = router->routeQuery(router_instance, rsession, queue);
if (rc == 1) {
protocol->state = MYSQL_WAITING_RESULT;
} else {
mysql_send_custom_error(dcb,
1,
0,
"Connection to backend lost.");
protocol->state = MYSQL_IDLE;
goto return_rc;
else
{
/** Route other commands to backend */
protocol->state = MYSQL_ROUTING;
rc = router->routeQuery(router_instance, rsession, queue);
/** succeed */
if (rc == 1) {
protocol->state = MYSQL_WAITING_RESULT;
rc = 0; /**< here '0' means success */
} else {
mysql_send_custom_error(dcb,
1,
0,
"Query routing failed. "
"Connection to backend "
"lost.");
protocol->state = MYSQL_IDLE;
}
}
}
goto return_rc;
} /* MYSQL_IDLE, MYSQL_WAITING_RESULT */
break;
default:
// todo
break;
}
rc = 0;
@ -950,75 +927,84 @@ int gw_MySQLAccept(DCB *listener)
&addrlen);
eno = errno;
if (c_sock == -1) {
#if defined(SS_DEBUG)
if (fail_next_accept) {
c_sock = -1;
eno = fail_accept_errno;
i = 10;
fail_next_accept = false;
fail_accept_errno = 0;
}
#endif /* SS_DEBUG */
if (c_sock == -1) {
if (eno == EAGAIN ||
eno == EWOULDBLOCK)
{
rc = 1;
/* We have processed all incoming connections. */
break;
}
else if (eno == ENFILE)
{
/**
* Exceeded system's max. number of files limit.
*/
skygw_log_write_flush(
LOGFILE_ERROR,
"%lu [gw_MySQLAccept] Error %d, %s.",
pthread_self(),
eno,
strerror(eno));
i++;
usleep(100*i*i);
if (i<10) {
goto retry_accept;
}
rc = 1;
goto return_rc;
}
else if (eno == EMFILE)
{
/**
* Exceeded processes max. number of files limit.
*/
skygw_log_write_flush(
LOGFILE_ERROR,
"%lu [gw_MySQLAccept] Error %d, %s.",
pthread_self(),
eno,
strerror(eno));
i++;
usleep(100*i*i);
if (eno == EAGAIN ||
eno == EWOULDBLOCK)
{
rc = 1;
/* We have processed all incoming connections. */
break;
}
else if (eno == ENFILE)
{
/**
* Exceeded system's max. number of files limit.
*/
skygw_log_write_flush(
LOGFILE_ERROR,
"%lu [gw_MySQLAccept] Error %d, %s.",
pthread_self(),
eno,
strerror(eno));
i++;
usleep(100*i*i);
if (i<10) {
goto retry_accept;
}
rc = 1;
goto return_rc;
}
else if (eno == EMFILE)
{
/**
* Exceeded processes max. number of files limit.
*/
skygw_log_write_flush(
LOGFILE_ERROR,
"%lu [gw_MySQLAccept] Error %d, %s.",
pthread_self(),
eno,
strerror(eno));
i++;
usleep(100*i*i);
if (i<10) {
goto retry_accept;
}
rc = 1;
goto return_rc;
}
else
{
/**
* Other error.
*/
skygw_log_write_flush(
LOGFILE_ERROR,
"%lu [gw_MySQLAccept] Error %d, %s.",
pthread_self(),
eno,
strerror(eno));
ss_dassert(false);
break;
} /* if (eno == ..) */
if (i<10) {
goto retry_accept;
}
rc = 1;
goto return_rc;
}
else
{
/**
* Other error.
*/
skygw_log_write_flush(
LOGFILE_ERROR,
"%lu [gw_MySQLAccept] Error %d, %s.",
pthread_self(),
eno,
strerror(eno));
ss_dassert(false);
break;
} /* if (eno == ..) */
} /* if (c_sock == -1) */
/* reset counter */
i = 0;
listener->stats.n_accepts++;
listener->stats.n_accepts++;
#if defined(SS_DEBUG)
skygw_log_write_flush(
LOGFILE_TRACE,
@ -1027,20 +1013,20 @@ int gw_MySQLAccept(DCB *listener)
c_sock);
conn_open[c_sock] = true;
#endif
fprintf(stderr,
fprintf(stderr,
"Processing %i connection fd %i for listener %i\n",
listener->stats.n_accepts,
c_sock,
listener->fd);
// set nonblocking
// set nonblocking
setsockopt(c_sock, SOL_SOCKET, SO_SNDBUF, &sendbuf, optlen);
setnonblocking(c_sock);
setsockopt(c_sock, SOL_SOCKET, SO_SNDBUF, &sendbuf, optlen);
setnonblocking(c_sock);
client_dcb = dcb_alloc(DCB_ROLE_REQUEST_HANDLER);
client_dcb->service = listener->session->service;
client_dcb->fd = c_sock;
client_dcb->remote = strdup(inet_ntoa(local.sin_addr));
client_dcb = dcb_alloc(DCB_ROLE_REQUEST_HANDLER);
client_dcb->service = listener->session->service;
client_dcb->fd = c_sock;
client_dcb->remote = strdup(inet_ntoa(local.sin_addr));
protocol = mysql_protocol_init(client_dcb, c_sock);
ss_dassert(protocol != NULL);
@ -1058,46 +1044,46 @@ int gw_MySQLAccept(DCB *listener)
goto return_rc;
}
client_dcb->protocol = protocol;
// assign function poiters to "func" field
memcpy(&client_dcb->func, &MyObject, sizeof(GWPROTOCOL));
//send handshake to the client_dcb
MySQLSendHandshake(client_dcb);
// assign function poiters to "func" field
memcpy(&client_dcb->func, &MyObject, sizeof(GWPROTOCOL));
//send handshake to the client_dcb
MySQLSendHandshake(client_dcb);
// client protocol state change
protocol->state = MYSQL_AUTH_SENT;
// client protocol state change
protocol->state = MYSQL_AUTH_SENT;
/**
* Set new descriptor to event set. At the same time,
* change state to DCB_STATE_POLLING so that
* thread which wakes up sees correct state.
*/
if (poll_add_dcb(client_dcb) == -1)
{
/** delete client_dcb */
dcb_close(client_dcb);
/**
* Set new descriptor to event set. At the same time,
* change state to DCB_STATE_POLLING so that
* thread which wakes up sees correct state.
*/
if (poll_add_dcb(client_dcb) == -1)
{
/** delete client_dcb */
dcb_close(client_dcb);
/** Previous state is recovered in poll_add_dcb. */
skygw_log_write_flush(
LOGFILE_ERROR,
"%lu [gw_MySQLAccept] Failed to add dcb %p for "
"fd %d to epoll set.",
pthread_self(),
client_dcb,
client_dcb->fd);
rc = 1;
goto return_rc;
}
else
{
skygw_log_write(
LOGFILE_TRACE,
"%lu [gw_MySQLAccept] Added dcb %p for fd "
"%d to epoll set.",
pthread_self(),
client_dcb,
client_dcb->fd);
}
} /**< while 1 */
/** Previous state is recovered in poll_add_dcb. */
skygw_log_write_flush(
LOGFILE_ERROR,
"%lu [gw_MySQLAccept] Failed to add dcb %p for "
"fd %d to epoll set.",
pthread_self(),
client_dcb,
client_dcb->fd);
rc = 1;
goto return_rc;
}
else
{
skygw_log_write(
LOGFILE_TRACE,
"%lu [gw_MySQLAccept] Added dcb %p for fd "
"%d to epoll set.",
pthread_self(),
client_dcb,
client_dcb->fd);
}
} /**< while 1 */
#if defined(SS_DEBUG)
if (rc == 0) {
CHK_DCB(client_dcb);
@ -1105,9 +1091,9 @@ int gw_MySQLAccept(DCB *listener)
CHK_PROTOCOL(protocol);
}
#endif
return_rc:
return rc;
}
return_rc:
return rc;
}
/*
*/

83
server/modules/routing/debugcmd.c
View File

@ -43,6 +43,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <service.h>
#include <session.h>
#include <router.h>
@ -189,10 +190,21 @@ static void disable_log_action(DCB *, char *);
* * The subcommands of the enable command
* */
struct subcommand enableoptions[] = {
{ "log", 1, enable_log_action, "Enable Log options for MaxScale, options trace | error | message E.g. enable log message.",
{ARG_TYPE_STRING, 0, 0} },
{ NULL, 0, NULL, NULL,
{0, 0, 0} }
{
"log",
1,
enable_log_action,
"Enable Log options for MaxScale, options trace | error | "
"message E.g. enable log message.",
{ARG_TYPE_STRING, 0, 0}
},
{
NULL,
0,
NULL,
NULL,
{0, 0, 0}
}
};
@ -200,17 +212,28 @@ struct subcommand enableoptions[] = {
* * The subcommands of the disable command
* */
struct subcommand disableoptions[] = {
{ "log", 1, disable_log_action, "Disable Log for MaxScale, Options: trace | error | message E.g. disable log trace",
{ARG_TYPE_STRING, 0, 0} },
{ NULL, 0, NULL, NULL,
{0, 0, 0} }
{
"log",
1,
disable_log_action,
"Disable Log for MaxScale, Options: trace | error | message E.g. "
"disable log trace",
{ARG_TYPE_STRING, 0, 0}
},
{
NULL,
0,
NULL,
NULL,
{0, 0, 0}
}
};
#if defined(SS_DEBUG)
static void fail_backendfd(void);
static void fail_clientfd(void);
static void fail_accept(DCB* dcb, char* arg1);
/**
* * The subcommands of the fail command
* */
@ -229,6 +252,13 @@ struct subcommand failoptions[] = {
"Fail client socket for next operation.",
{ARG_TYPE_STRING, 0, 0}
},
{
"accept",
1,
fail_accept,
"Fail to accept next client connection.",
{ARG_TYPE_STRING, 0, 0}
},
{
NULL,
0,
@ -735,11 +765,42 @@ static void disable_log_action(DCB *dcb, char *arg1) {
#if defined(SS_DEBUG)
static void fail_backendfd(void)
{
fail_next_backend_fd = TRUE;
fail_next_backend_fd = true;
}
static void fail_clientfd(void)
{
fail_next_client_fd = TRUE;
fail_next_client_fd = true;
}
static void fail_accept(
DCB* dcb,
char* arg1)
{
fail_accept_errno = atoi(arg1);
switch(fail_accept_errno) {
case EAGAIN:
// case EWOULDBLOCK:
case EBADF:
case EINTR:
case EINVAL:
case EMFILE:
case ENFILE:
case ENOTSOCK:
case EOPNOTSUPP:
case ENOBUFS:
case ENOMEM:
case EPROTO:
fail_next_accept = true;
break;
default:
dcb_printf(dcb,
"[%d, %s] is not valid errno for accept.\n",
fail_accept_errno,
strerror(fail_accept_errno));
return ;
}
}
#endif