void uwsgi_mule_handler() {
ssize_t len;
uint8_t uwsgi_signal;
int rlen;
int interesting_fd;
// this must be configurable
char message[65536];
int mule_queue = event_queue_init();
event_queue_add_fd_read(mule_queue, uwsgi.signal_socket);
event_queue_add_fd_read(mule_queue, uwsgi.my_signal_socket);
event_queue_add_fd_read(mule_queue, uwsgi.mules[uwsgi.muleid - 1].queue_pipe[1]);
event_queue_add_fd_read(mule_queue, uwsgi.shared->mule_queue_pipe[1]);
uwsgi_mule_add_farm_to_queue(mule_queue);
for (;;) {
rlen = event_queue_wait(mule_queue, -1, &interesting_fd);
if (rlen <= 0) {
continue;
}
if (interesting_fd == uwsgi.signal_socket || interesting_fd == uwsgi.my_signal_socket || farm_has_signaled(interesting_fd)) {
len = read(interesting_fd, &uwsgi_signal, 1);
if (len <= 0) {
uwsgi_log_verbose("uWSGI mule %d braying: my master died, i will follow him...\n", uwsgi.muleid);
end_me(0);
}
#ifdef UWSGI_DEBUG
uwsgi_log_verbose("master sent signal %d to mule %d\n", uwsgi_signal, uwsgi.muleid);
#endif
if (uwsgi_signal_handler(uwsgi_signal)) {
uwsgi_log_verbose("error managing signal %d on mule %d\n", uwsgi_signal, uwsgi.muleid);
}
}
else if (interesting_fd == uwsgi.mules[uwsgi.muleid - 1].queue_pipe[1] || interesting_fd == uwsgi.shared->mule_queue_pipe[1] || farm_has_msg(interesting_fd)) {
len = read(interesting_fd, message, 65536);
if (len < 0) {
uwsgi_error("read()");
}
else {
int i, found = 0;
for (i = 0; i < 256; i++) {
if (uwsgi.p[i]->mule_msg) {
if (uwsgi.p[i]->mule_msg(message, len)) {
found = 1;
break;
}
}
}
if (!found)
uwsgi_log("*** mule %d received a %ld bytes message ***\n", uwsgi.muleid, (long) len);
}
}
}
}
void uwsgi_corerouter_manage_subscription(struct uwsgi_corerouter *ucr, int id, struct uwsgi_gateway_socket *ugs) {
int i;
struct uwsgi_subscribe_req usr;
char bbuf[4096];
ssize_t len = recv(ugs->fd, bbuf, 4096, 0);
#ifdef UWSGI_EVENT_USE_PORT
event_queue_add_fd_read(ucr->queue, ugs->fd);
#endif
if (len > 0) {
memset(&usr, 0, sizeof(struct uwsgi_subscribe_req));
uwsgi_hooked_parse(bbuf + 4, len - 4, corerouter_manage_subscription, &usr);
// subscribe request ?
if (bbuf[3] == 0) {
if (uwsgi_add_subscribe_node(&ucr->subscriptions, &usr, ucr->subscription_regexp) && ucr->i_am_cheap) {
struct uwsgi_gateway_socket *ugs = uwsgi.gateway_sockets;
while (ugs) {
if (!strcmp(ugs->owner, ucr->name) && !ugs->subscription) {
event_queue_add_fd_read(ucr->queue, ugs->fd);
}
ugs = ugs->next;
}
ucr->i_am_cheap = 0;
uwsgi_log("[%s pid %d] leaving cheap mode...\n", ucr->name, (int) uwsgi.mypid);
}
}
//unsubscribe
else {
struct uwsgi_subscribe_node *node = uwsgi_get_subscribe_node_by_name(&ucr->subscriptions, usr.key, usr.keylen, usr.address, usr.address_len, ucr->subscription_regexp);
if (node && node->len) {
if (node->death_mark == 0)
uwsgi_log("[%s pid %d] %.*s => marking %.*s as failed\n", ucr->name, (int) uwsgi.mypid, (int) usr.keylen, usr.key, (int) usr.address_len, usr.address);
node->failcnt++;
node->death_mark = 1;
// check if i can remove the node
if (node->reference == 0) {
uwsgi_remove_subscribe_node(&ucr->subscriptions, node);
}
if (ucr->subscriptions == NULL && ucr->cheap && !ucr->i_am_cheap) {
uwsgi_gateway_go_cheap(ucr->name, ucr->queue, &ucr->i_am_cheap);
}
}
}
// propagate the subscription to other nodes
for (i = 0; i < ushared->gateways_cnt; i++) {
if (i == id)
continue;
if (!strcmp(ushared->gateways[i].name, ucr->name)) {
if (send(ushared->gateways[i].internal_subscription_pipe[0], bbuf, len, 0) != len) {
uwsgi_error("send()");
}
}
}
}
}
void uwsgi_mule_add_farm_to_queue(int queue) {
int i;
for (i = 0; i < uwsgi.farms_cnt; i++) {
if (uwsgi_farm_has_mule(&uwsgi.farms[i], uwsgi.muleid)) {
event_queue_add_fd_read(queue, uwsgi.farms[i].signal_pipe[1]);
event_queue_add_fd_read(queue, uwsgi.farms[i].queue_pipe[1]);
}
}
}
static int u_offload_pipe_do(struct uwsgi_thread *ut, struct uwsgi_offload_request *uor, int fd) {
ssize_t rlen;
// setup
if (fd == -1) {
event_queue_add_fd_read(ut->queue, uor->fd);
return 0;
}
switch(uor->status) {
// read event from fd
case 0:
if (!uor->buf) {
uor->buf = uwsgi_malloc(4096);
}
rlen = read(uor->fd, uor->buf, 4096);
if (rlen > 0) {
uor->to_write = rlen;
uor->pos = 0;
if (event_queue_del_fd(ut->queue, uor->fd, event_queue_read())) return -1;
if (event_queue_add_fd_write(ut->queue, uor->s)) return -1;
uor->status = 1;
return 0;
}
if (rlen < 0) {
uwsgi_offload_retry
uwsgi_error("u_offload_pipe_do() -> read()");
}
return -1;
// write event on s
case 1:
rlen = write(uor->s, uor->buf + uor->pos, uor->to_write);
if (rlen > 0) {
uor->to_write -= rlen;
uor->pos += rlen;
if (uor->to_write == 0) {
if (event_queue_del_fd(ut->queue, uor->s, event_queue_write())) return -1;
if (event_queue_add_fd_read(ut->queue, uor->fd)) return -1;
uor->status = 0;
}
return 0;
}
else if (rlen < 0) {
uwsgi_offload_retry
uwsgi_error("u_offload_pipe_do() -> write()");
}
return -1;
default:
break;
}
return -1;
}
void *simple_loop_run(void *arg1) {
long core_id = (long) arg1;
struct wsgi_request *wsgi_req = &uwsgi.workers[uwsgi.mywid].cores[core_id].req;
if (uwsgi.threads > 1) {
uwsgi_setup_thread_req(core_id, wsgi_req);
}
// initialize the main event queue to monitor sockets
int main_queue = event_queue_init();
uwsgi_add_sockets_to_queue(main_queue, core_id);
if (uwsgi.signal_socket > -1) {
event_queue_add_fd_read(main_queue, uwsgi.signal_socket);
event_queue_add_fd_read(main_queue, uwsgi.my_signal_socket);
}
// ok we are ready, let's start managing requests and signals
while (uwsgi.workers[uwsgi.mywid].manage_next_request) {
wsgi_req_setup(wsgi_req, core_id, NULL);
if (wsgi_req_accept(main_queue, wsgi_req)) {
continue;
}
if (wsgi_req_recv(main_queue, wsgi_req)) {
uwsgi_destroy_request(wsgi_req);
continue;
}
uwsgi_close_request(wsgi_req);
}
// end of the loop
if (uwsgi.workers[uwsgi.mywid].destroy && uwsgi.workers[0].pid > 0) {
#ifdef __APPLE__
kill(uwsgi.workers[0].pid, SIGTERM);
#else
if (uwsgi.propagate_touch) {
kill(uwsgi.workers[0].pid, SIGHUP);
}
else {
gracefully_kill(0);
}
#endif
}
return NULL;
}
void uwsgi_add_sockets_to_queue(int queue, int async_id) {
struct uwsgi_socket *uwsgi_sock = uwsgi.sockets;
while (uwsgi_sock) {
if (uwsgi_sock->fd_threads && async_id > -1) {
event_queue_add_fd_read(queue, uwsgi_sock->fd_threads[async_id]);
}
else if (uwsgi_sock->fd > -1) {
event_queue_add_fd_read(queue, uwsgi_sock->fd);
}
uwsgi_sock = uwsgi_sock->next;
}
}
int event_queue_add_file_monitor(int eq, char *filename, int *id) {
int ifd = -1;
int i;
int add_to_queue = 0;
for (i=0;i<ushared->files_monitored_cnt;i++) {
if (ushared->files_monitored[i].registered) {
ifd = ushared->files_monitored[0].fd;
break;
}
}
if (ifd == -1) {
ifd = inotify_init();
if (ifd < 0) {
uwsgi_error("inotify_init()");
return -1;
}
add_to_queue = 1;
}
*id = inotify_add_watch(ifd, filename, IN_ATTRIB|IN_CREATE|IN_DELETE|IN_DELETE_SELF|IN_MODIFY|IN_MOVE_SELF|IN_MOVED_FROM|IN_MOVED_TO);
#ifdef UWSGI_DEBUG
uwsgi_log("added watch %d for filename %s\n", *id, filename);
#endif
if (add_to_queue) {
return event_queue_add_fd_read(eq, ifd);
}
else {
return ifd;
}
}
int event_queue_add_timer(int eq, int *id, int sec) {
struct itimerspec it;
int tfd = timerfd_create(CLOCK_REALTIME, TFD_CLOEXEC);
if (tfd < 0) {
uwsgi_error("timerfd_create()");
return -1;
}
it.it_value.tv_sec = sec;
it.it_value.tv_nsec = 0;
it.it_interval.tv_sec = sec;
it.it_interval.tv_nsec = 0;
if (timerfd_settime(tfd, 0, &it, NULL)) {
uwsgi_error("timerfd_settime()");
close(tfd);
return -1;
}
*id = tfd;
return event_queue_add_fd_read(eq, tfd);
}
int async_add_fd_read(struct wsgi_request *wsgi_req, int fd, int timeout) {
struct uwsgi_async_fd *last_uad = NULL, *uad = wsgi_req->waiting_fds;
if (fd < 0)
return -1;
// find last slot
while (uad) {
last_uad = uad;
uad = uad->next;
}
uad = uwsgi_malloc(sizeof(struct uwsgi_async_fd));
uad->fd = fd;
uad->event = event_queue_read();
uad->prev = last_uad;
uad->next = NULL;
if (last_uad) {
last_uad->next = uad;
}
else {
wsgi_req->waiting_fds = uad;
}
if (timeout > 0) {
async_add_timeout(wsgi_req, timeout);
}
uwsgi.async_waiting_fd_table[fd] = wsgi_req;
wsgi_req->async_force_again = 1;
return event_queue_add_fd_read(uwsgi.async_queue, fd);
}
// initialize the zmq PULL socket
static void uwsgi_imperial_monitor_zeromq_init(struct uwsgi_emperor_scanner *ues) {
void *context = uwsgi_zeromq_init();
ues->data = zmq_socket(context, ZMQ_PULL);
if (!ues->data) {
uwsgi_error("zmq_socket()");
exit(1);
}
if (zmq_bind(ues->data, ues->arg+6)) {
uwsgi_error("zmq_socket()");
exit(1);
}
size_t zmq_socket_len = sizeof(int);
if (zmq_getsockopt(ues->data, ZMQ_FD, &ues->fd, &zmq_socket_len) < 0) {
uwsgi_error("zmq_getsockopt()");
exit(1);
}
ues->event_func = uwsgi_imperial_monitor_zeromq_event;
event_queue_add_fd_read(uwsgi.emperor_queue, ues->fd);
}
void zergpool_loop(int id) {
int i;
int zergpool_queue = event_queue_init();
void *events = event_queue_alloc(ZERGPOOL_EVENTS);
struct zergpool_socket *zps = zergpool_sockets;
while(zps) {
event_queue_add_fd_read(zergpool_queue, zps->fd);
zps = zps->next;
}
for(;;) {
int nevents = event_queue_wait_multi(zergpool_queue, -1, events, ZERGPOOL_EVENTS);
for(i=0;i<nevents;i++) {
int interesting_fd = event_queue_interesting_fd(events, i);
zps = zergpool_sockets;
while(zps) {
if (zps->fd == interesting_fd) {
uwsgi_manage_zerg(zps->fd, zps->num_sockets, zps->sockets);
}
zps = zps->next;
}
}
}
}
static void uwsgi_alarm_thread_loop(struct uwsgi_thread *ut) {
// add uwsgi_alarm_fd;
struct uwsgi_alarm_fd *uafd = uwsgi.alarm_fds;
while(uafd) {
event_queue_add_fd_read(ut->queue, uafd->fd);
uafd = uafd->next;
}
char *buf = uwsgi_malloc(uwsgi.alarm_msg_size + sizeof(long));
for (;;) {
int interesting_fd = -1;
int ret = event_queue_wait(ut->queue, -1, &interesting_fd);
if (ret > 0) {
if (interesting_fd == ut->pipe[1]) {
ssize_t len = read(ut->pipe[1], buf, uwsgi.alarm_msg_size + sizeof(long));
if (len > (ssize_t)(sizeof(long) + 1)) {
size_t msg_size = len - sizeof(long);
char *msg = buf + sizeof(long);
long ptr = 0;
memcpy(&ptr, buf, sizeof(long));
struct uwsgi_alarm_instance *uai = (struct uwsgi_alarm_instance *) ptr;
if (!uai)
break;
uwsgi_alarm_run(uai, msg, msg_size);
}
}
// check for alarm_fd
else {
uafd = uwsgi.alarm_fds;
int fd_read = 0;
while(uafd) {
if (interesting_fd == uafd->fd) {
if (fd_read) goto raise;
size_t remains = uafd->buf_len;
while(remains) {
ssize_t len = read(uafd->fd, uafd->buf + (uafd->buf_len-remains), remains);
if (len <= 0) {
uwsgi_error("[uwsgi-alarm-fd]/read()");
uwsgi_log("[uwsgi-alarm-fd] i will stop monitoring fd %d\n", uafd->fd);
event_queue_del_fd(ut->queue, uafd->fd, event_queue_read());
break;
}
remains-=len;
}
fd_read = 1;
raise:
uwsgi_alarm_run(uafd->alarm, uafd->msg, uafd->msg_len);
}
uafd = uafd->next;
}
}
}
}
free(buf);
}
void uwsgi_add_sockets_to_queue(int queue) {
struct uwsgi_socket *uwsgi_sock = uwsgi.sockets;
while (uwsgi_sock) {
if (uwsgi_sock->fd > -1) {
event_queue_add_fd_read(queue, uwsgi_sock->fd);
}
uwsgi_sock = uwsgi_sock->next;
}
}
int uwsgi_cr_hook_instance_read(struct corerouter_session *cs, ssize_t (*hook)(struct corerouter_session *)) {
struct uwsgi_corerouter *ucr = cs->corerouter;
// first check the case of event removal
if (hook == NULL) {
// nothing changed
if (!cs->event_hook_instance_read) goto unchanged;
// if there is a write event defined, le'ts modify it
if (cs->event_hook_instance_write) {
#ifdef UWSGI_DEBUG
uwsgi_log("event_queue_fd_readwrite_to_write() for %d\n", cs->instance_fd);
#endif
if (event_queue_fd_readwrite_to_write(ucr->queue, cs->instance_fd)) return -1;
}
// simply remove the read event
else {
#ifdef UWSGI_DEBUG
uwsgi_log("event_queue_del_fd() for %d\n", cs->instance_fd);
#endif
if (event_queue_del_fd(ucr->queue, cs->instance_fd, event_queue_read())) return -1;
}
}
else {
// set the hook
// if write is not defined, simply add a single monitor
if (cs->event_hook_instance_write == NULL) {
if (!cs->event_hook_instance_read) {
#ifdef UWSGI_DEBUG
uwsgi_log("event_queue_add_fd_read() for %d\n", cs->instance_fd);
#endif
if (event_queue_add_fd_read(ucr->queue, cs->instance_fd)) return -1;
}
}
else {
if (!cs->event_hook_instance_read) {
#ifdef UWSGI_DEBUG
uwsgi_log("event_queue_fd_write_to_readwrite() for %d\n", cs->instance_fd);
#endif
if (event_queue_fd_write_to_readwrite(ucr->queue, cs->instance_fd)) return -1;
}
}
}
unchanged:
#ifdef UWSGI_DEBUG
uwsgi_log("event_hook_instance_read set to %p for %d\n", hook, cs->instance_fd);
#endif
cs->event_hook_instance_read = hook;
return 0;
}
static VALUE uwsgi_rb_thread_core(void *arg) {
long core_id = (long) arg;
struct wsgi_request *wsgi_req = &uwsgi.workers[uwsgi.mywid].cores[core_id].req;
uwsgi_setup_thread_req(core_id, wsgi_req);
struct uwsgi_rbthread *urbt = uwsgi_malloc(sizeof(struct uwsgi_rbthread));
// initialize the main event queue to monitor sockets
urbt->queue = event_queue_init();
urbt->wsgi_req = wsgi_req;
uwsgi_add_sockets_to_queue(urbt->queue, (int)core_id);
if (uwsgi.signal_socket > -1) {
event_queue_add_fd_read(urbt->queue, uwsgi.signal_socket);
event_queue_add_fd_read(urbt->queue, uwsgi.my_signal_socket);
}
// ok we are ready, let's start managing requests and signals
while (uwsgi.workers[uwsgi.mywid].manage_next_request) {
wsgi_req_setup(wsgi_req, (int)core_id, NULL);
rb_thread_call_without_gvl(uwsgi_rb_thread_accept, urbt, NULL, NULL);
// accept failed ?
if (urbt->ret) continue;
if (wsgi_req_recv(urbt->queue, wsgi_req)) {
uwsgi_destroy_request(wsgi_req);
continue;
}
uwsgi_close_request(wsgi_req);
}
return Qnil;
}
struct corerouter_session *corerouter_alloc_session(struct uwsgi_corerouter *ucr, struct uwsgi_gateway_socket *ugs, int new_connection, struct sockaddr *cr_addr, socklen_t cr_addr_len) {
ucr->cr_table[new_connection] = uwsgi_calloc(ucr->session_size);
ucr->cr_table[new_connection]->fd = new_connection;
ucr->cr_table[new_connection]->instance_fd = -1;
ucr->cr_table[new_connection]->status = COREROUTER_STATUS_RECV_HDR;
ucr->cr_table[new_connection]->timeout = cr_add_timeout(ucr, ucr->cr_table[new_connection]);
ucr->cr_table[new_connection]->ugs = ugs;
ucr->alloc_session(ucr, ugs, ucr->cr_table[new_connection], cr_addr, cr_addr_len);
event_queue_add_fd_read(ucr->queue, new_connection);
return ucr->cr_table[new_connection];
}
void *uwsgi_corerouter_setup_event_queue(struct uwsgi_corerouter *ucr, int id) {
ucr->queue = event_queue_init();
struct uwsgi_gateway_socket *ugs = uwsgi.gateway_sockets;
while (ugs) {
if (!strcmp(ucr->name, ugs->owner)) {
if (!ucr->cheap || ugs->subscription) {
event_queue_add_fd_read(ucr->queue, ugs->fd);
}
ugs->gateway = &ushared->gateways[id];
}
ugs = ugs->next;
}
return event_queue_alloc(ucr->nevents);
}
void uwsgi_corerouter_manage_internal_subscription(struct uwsgi_corerouter *ucr, int fd) {
struct uwsgi_subscribe_req usr;
char bbuf[4096];
ssize_t len = recv(fd, bbuf, 4096, 0);
if (len > 0) {
memset(&usr, 0, sizeof(struct uwsgi_subscribe_req));
uwsgi_hooked_parse(bbuf + 4, len - 4, corerouter_manage_subscription, &usr);
// subscribe request ?
if (bbuf[3] == 0) {
if (uwsgi_add_subscribe_node(ucr->subscriptions, &usr) && ucr->i_am_cheap) {
struct uwsgi_gateway_socket *ugs = uwsgi.gateway_sockets;
while (ugs) {
if (!strcmp(ugs->owner, ucr->name) && !ugs->subscription) {
event_queue_add_fd_read(ucr->queue, ugs->fd);
}
ugs = ugs->next;
}
ucr->i_am_cheap = 0;
uwsgi_log("[%s pid %d] leaving cheap mode...\n", ucr->name, (int) uwsgi.mypid);
}
}
//unsubscribe
else {
struct uwsgi_subscribe_node *node = uwsgi_get_subscribe_node_by_name(ucr->subscriptions, usr.key, usr.keylen, usr.address, usr.address_len);
if (node && node->len) {
if (node->death_mark == 0)
uwsgi_log("[%s pid %d] %.*s => marking %.*s as failed\n", ucr->name, (int) uwsgi.mypid, (int) usr.keylen, usr.key, (int) usr.address_len, usr.address);
node->failcnt++;
node->death_mark = 1;
// check if i can remove the node
if (node->reference == 0) {
uwsgi_remove_subscribe_node(ucr->subscriptions, node);
}
if (ucr->cheap && !ucr->i_am_cheap && uwsgi_no_subscriptions(ucr->subscriptions)) {
uwsgi_gateway_go_cheap(ucr->name, ucr->queue, &ucr->i_am_cheap);
}
}
}
}
}
int event_queue_interesting_fd(void *events, int id) {
port_event_t *pe = (port_event_t *) events;
if (pe[id].portev_source == PORT_SOURCE_FILE || pe[id].portev_source == PORT_SOURCE_TIMER) {
return (long) pe[id].portev_user;
}
int fd = (int) pe[id].portev_object;
int eq = (int) pe[id].portev_user;
if (pe[id].portev_events == POLLOUT) {
event_queue_add_fd_write(eq, fd);
}
if (pe[id].portev_events == POLLIN) {
event_queue_add_fd_read(eq, fd);
}
return fd;
}
int uwsgi_setup_snmp(void) {
int snmp_fd = -1;
int i;
if (uwsgi.snmp) {
if (uwsgi.snmp_community) {
if (strlen(uwsgi.snmp_community) > 72) {
uwsgi_log("*** warning the supplied SNMP community string will be truncated to 72 chars ***\n");
memcpy(uwsgi.shared->snmp_community, uwsgi.snmp_community, 72);
}
else {
memcpy(uwsgi.shared->snmp_community, uwsgi.snmp_community, strlen(uwsgi.snmp_community) + 1);
}
}
uwsgi.shared->snmp_gvalue[0].type = SNMP_COUNTER64;
uwsgi.shared->snmp_gvalue[0].val = &uwsgi.workers[0].requests;
for (i = 0; i < uwsgi.numproc; i++) {
uwsgi.shared->snmp_gvalue[30 + i].type = SNMP_COUNTER64;
uwsgi.shared->snmp_gvalue[30 + i].val = &uwsgi.workers[i + 1].requests;
}
if (uwsgi.snmp_addr) {
snmp_fd = bind_to_udp(uwsgi.snmp_addr, 0, 0);
if (snmp_fd < 0) {
uwsgi_log("unable to bind to udp socket. SNMP service will be disabled.\n");
}
else {
uwsgi_log("SNMP server enabled on %s\n", uwsgi.snmp_addr);
event_queue_add_fd_read(uwsgi.master_queue, snmp_fd);
}
}
else {
uwsgi_log("SNMP agent enabled.\n");
}
}
return snmp_fd;
}
void uwsgi_imperial_monitor_amqp_init(struct uwsgi_emperor_scanner *ues) {
char *vhost = "/";
char *username = "******";
char *password = "******";
ues->fd = uwsgi_connect(ues->arg+7, -1, 0);
if (ues->fd < 0) {
uwsgi_log("unable to connect to AMQP server\n");
return;
}
if (uwsgi_amqp_consume_queue(ues->fd, vhost, username, password, "", "uwsgi.emperor", "fanout") < 0) {
close(ues->fd);
ues->fd = -1;
uwsgi_log("unable to subscribe to AMQP queue\n");
return;
}
ues->event_func = uwsgi_imperial_monitor_amqp_event;
event_queue_add_fd_read(uwsgi.emperor_queue, ues->fd);
}
void emperor_loop() {
// monitor a directory
struct uwsgi_instance ui_base;
struct uwsgi_instance *ui_current;
pid_t diedpid;
int waitpid_status;
int has_children = 0;
int i_am_alone = 0;
int i;
void *events;
int nevents;
int interesting_fd;
char notification_message[64];
struct rlimit rl;
uwsgi.emperor_stats_fd = -1;
if (uwsgi.emperor_pidfile) {
uwsgi_write_pidfile(uwsgi.emperor_pidfile);
}
signal(SIGPIPE, SIG_IGN);
uwsgi_unix_signal(SIGINT, royal_death);
uwsgi_unix_signal(SIGTERM, royal_death);
uwsgi_unix_signal(SIGQUIT, royal_death);
uwsgi_unix_signal(SIGUSR1, emperor_stats);
uwsgi_unix_signal(SIGHUP, emperor_massive_reload);
memset(&ui_base, 0, sizeof(struct uwsgi_instance));
if (getrlimit(RLIMIT_NOFILE, &rl)) {
uwsgi_error("getrlimit()");
exit(1);
}
uwsgi.max_fd = rl.rlim_cur;
emperor_throttle_level = uwsgi.emperor_throttle;
// the queue must be initialized before adding scanners
uwsgi.emperor_queue = event_queue_init();
emperor_build_scanners();
events = event_queue_alloc(64);
if (uwsgi.has_emperor) {
uwsgi_log("*** starting uWSGI sub-Emperor ***\n");
}
else {
uwsgi_log("*** starting uWSGI Emperor ***\n");
}
if (uwsgi.emperor_stats) {
char *tcp_port = strchr(uwsgi.emperor_stats, ':');
if (tcp_port) {
// disable deferred accept for this socket
int current_defer_accept = uwsgi.no_defer_accept;
uwsgi.no_defer_accept = 1;
uwsgi.emperor_stats_fd = bind_to_tcp(uwsgi.emperor_stats, uwsgi.listen_queue, tcp_port);
uwsgi.no_defer_accept = current_defer_accept;
}
else {
uwsgi.emperor_stats_fd = bind_to_unix(uwsgi.emperor_stats, uwsgi.listen_queue, uwsgi.chmod_socket, uwsgi.abstract_socket);
}
event_queue_add_fd_read(uwsgi.emperor_queue, uwsgi.emperor_stats_fd);
uwsgi_log("*** Emperor stats server enabled on %s fd: %d ***\n", uwsgi.emperor_stats, uwsgi.emperor_stats_fd);
}
ui = &ui_base;
int freq = 0;
for (;;) {
if (!i_am_alone) {
diedpid = waitpid(uwsgi.emperor_pid, &waitpid_status, WNOHANG);
if (diedpid < 0 || diedpid > 0) {
i_am_alone = 1;
}
}
nevents = event_queue_wait_multi(uwsgi.emperor_queue, freq, events, 64);
freq = uwsgi.emperor_freq;
for (i = 0; i < nevents; i++) {
interesting_fd = event_queue_interesting_fd(events, i);
if (uwsgi.emperor_stats && uwsgi.emperor_stats_fd > -1 && interesting_fd == uwsgi.emperor_stats_fd) {
emperor_send_stats(uwsgi.emperor_stats_fd);
continue;
}
// check if a monitor is mapped to that file descriptor
if (uwsgi_emperor_scanner_event(interesting_fd))
continue;
ui_current = emperor_get_by_fd(interesting_fd);
if (ui_current) {
char byte;
ssize_t rlen = read(interesting_fd, &byte, 1);
if (rlen <= 0) {
// SAFE
if (!ui_current->config_len) {
emperor_del(ui_current);
}
}
else {
if (byte == 17) {
ui_current->loyal = 1;
ui_current->last_loyal = uwsgi_now();
uwsgi_log("[emperor] vassal %s is now loyal\n", ui_current->name);
// remove it from the blacklist
uwsgi_emperor_blacklist_remove(ui_current->name);
// TODO post-start hook
}
// heartbeat can be used for spotting blocked instances
else if (byte == 26) {
ui_current->last_heartbeat = uwsgi_now();
}
else if (byte == 22) {
emperor_stop(ui_current);
}
else if (byte == 30 && uwsgi.emperor_broodlord > 0 && uwsgi.emperor_broodlord_count < uwsgi.emperor_broodlord) {
uwsgi_log("[emperor] going in broodlord mode: launching zergs for %s\n", ui_current->name);
char *zerg_name = uwsgi_concat3(ui_current->name, ":", "zerg");
emperor_add(NULL, zerg_name, uwsgi_now(), NULL, 0, ui_current->uid, ui_current->gid);
free(zerg_name);
}
}
}
else {
uwsgi_log("[emperor] unrecognized vassal event on fd %d\n", interesting_fd);
close(interesting_fd);
}
}
uwsgi_emperor_run_scanners();
// check for heartbeat (if required)
ui_current = ui->ui_next;
while (ui_current) {
if (ui_current->last_heartbeat > 0) {
if ((ui_current->last_heartbeat + uwsgi.emperor_heartbeat) < uwsgi_now()) {
uwsgi_log("[emperor] vassal %s sent no heartbeat in last %d seconds, respawning it...\n", ui_current->name, uwsgi.emperor_heartbeat);
// set last_heartbeat to 0 avoiding races
ui_current->last_heartbeat = 0;
emperor_respawn(ui_current, uwsgi_now());
}
}
ui_current = ui_current->ui_next;
}
// check for removed instances
ui_current = ui;
has_children = 0;
while (ui_current->ui_next) {
ui_current = ui_current->ui_next;
has_children++;
}
if (uwsgi.notify) {
if (snprintf(notification_message, 64, "The Emperor is governing %d vassals", has_children) >= 34) {
uwsgi_notify(notification_message);
}
}
if (has_children) {
diedpid = waitpid(WAIT_ANY, &waitpid_status, WNOHANG);
}
else {
// vacuum
waitpid(WAIT_ANY, &waitpid_status, WNOHANG);
diedpid = 0;
}
if (diedpid < 0) {
// it looks like it happens when OOM is triggered to Linux cgroup, but it could be a uWSGI bug :P
// by the way, fallback to a clean situation...
if (errno == ECHILD) {
uwsgi_log("--- MUTINY DETECTED !!! IMPALING VASSALS... ---\n");
ui_current = ui->ui_next;
while (ui_current) {
struct uwsgi_instance *rebel_vassal = ui_current;
ui_current = ui_current->ui_next;
emperor_del(rebel_vassal);
}
}
else {
uwsgi_error("waitpid()");
}
}
ui_current = ui;
while (ui_current->ui_next) {
ui_current = ui_current->ui_next;
if (ui_current->status == 1) {
if (ui_current->config)
free(ui_current->config);
// SAFE
emperor_del(ui_current);
break;
}
else if (ui_current->pid == diedpid) {
if (ui_current->status == 0) {
// respawn an accidentally dead instance if its exit code is not UWSGI_EXILE_CODE
if (WIFEXITED(waitpid_status) && WEXITSTATUS(waitpid_status) == UWSGI_EXILE_CODE) {
// SAFE
emperor_del(ui_current);
}
else {
// UNSAFE
emperor_add(ui_current->scanner, ui_current->name, ui_current->last_mod, ui_current->config, ui_current->config_len, ui_current->uid, ui_current->gid);
emperor_del(ui_current);
}
break;
}
else if (ui_current->status == 1) {
// remove 'marked for dead' instance
if (ui_current->config)
free(ui_current->config);
// SAFE
emperor_del(ui_current);
break;
}
}
}
}
}
void *simple_loop(void *arg1) {
long core_id = (long) arg1;
struct wsgi_request *wsgi_req = uwsgi.wsgi_requests[core_id];
#ifdef UWSGI_THREADING
int i;
sigset_t smask;
if (uwsgi.threads > 1) {
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &i);
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &i);
pthread_setspecific(uwsgi.tur_key, (void *) wsgi_req);
if (core_id > 0) {
// block all signals on new threads
sigfillset(&smask);
#ifdef UWSGI_DEBUG
sigdelset(&smask, SIGSEGV);
#endif
pthread_sigmask(SIG_BLOCK, &smask, NULL);
// run per-thread socket hook
struct uwsgi_socket *uwsgi_sock = uwsgi.sockets;
while(uwsgi_sock) {
if (uwsgi_sock->proto_thread_fixup) {
uwsgi_sock->proto_thread_fixup(uwsgi_sock, core_id);
}
uwsgi_sock = uwsgi_sock->next;
}
for (i = 0; i < 256; i++) {
if (uwsgi.p[i]->init_thread) {
uwsgi.p[i]->init_thread(core_id);
}
}
}
}
#endif
// initialize the main event queue to monitor sockets
int main_queue = event_queue_init();
uwsgi_add_sockets_to_queue(main_queue, core_id);
if (uwsgi.signal_socket > -1) {
event_queue_add_fd_read(main_queue, uwsgi.signal_socket);
event_queue_add_fd_read(main_queue, uwsgi.my_signal_socket);
}
// ok we are ready, let's start managing requests and signals
while (uwsgi.workers[uwsgi.mywid].manage_next_request) {
wsgi_req_setup(wsgi_req, core_id, NULL);
if (wsgi_req_accept(main_queue, wsgi_req)) {
continue;
}
if (wsgi_req_recv(wsgi_req)) {
uwsgi_destroy_request(wsgi_req);
continue;
}
uwsgi_close_request(wsgi_req);
}
// end of the loop
if (uwsgi.workers[uwsgi.mywid].destroy && uwsgi.workers[0].pid > 0) {
#ifdef __APPLE__
kill(uwsgi.workers[0].pid, SIGTERM);
#else
if (uwsgi.propagate_touch) {
kill(uwsgi.workers[0].pid, SIGHUP);
}
else {
gracefully_kill(0);
}
#endif
}
return NULL;
}
void uwsgi_corerouter_loop(int id, void *data) {
int i;
struct uwsgi_corerouter *ucr = (struct uwsgi_corerouter *) data;
ucr->cr_stats_server = -1;
ucr->cr_table = uwsgi_malloc(sizeof(struct corerouter_session *) * uwsgi.max_fd);
for (i = 0; i < (int) uwsgi.max_fd; i++) {
ucr->cr_table[i] = NULL;
}
ucr->i_am_cheap = ucr->cheap;
void *events = uwsgi_corerouter_setup_event_queue(ucr, id);
if (ucr->has_subscription_sockets)
event_queue_add_fd_read(ucr->queue, ushared->gateways[id].internal_subscription_pipe[1]);
if (!ucr->socket_timeout)
ucr->socket_timeout = 60;
if (!ucr->static_node_gracetime)
ucr->static_node_gracetime = 30;
int i_am_the_first = 1;
for(i=0;i<id;i++) {
if (!strcmp(ushared->gateways[i].name, ucr->name)) {
i_am_the_first = 0;
break;
}
}
if (ucr->stats_server && i_am_the_first) {
char *tcp_port = strchr(ucr->stats_server, ':');
if (tcp_port) {
// disable deferred accept for this socket
int current_defer_accept = uwsgi.no_defer_accept;
uwsgi.no_defer_accept = 1;
ucr->cr_stats_server = bind_to_tcp(ucr->stats_server, uwsgi.listen_queue, tcp_port);
uwsgi.no_defer_accept = current_defer_accept;
}
else {
ucr->cr_stats_server = bind_to_unix(ucr->stats_server, uwsgi.listen_queue, uwsgi.chmod_socket, uwsgi.abstract_socket);
}
event_queue_add_fd_read(ucr->queue, ucr->cr_stats_server);
uwsgi_log("*** %s stats server enabled on %s fd: %d ***\n", ucr->short_name, ucr->stats_server, ucr->cr_stats_server);
}
if (ucr->use_socket) {
ucr->to_socket = uwsgi_get_socket_by_num(ucr->socket_num);
if (ucr->to_socket) {
// fix socket name_len
if (ucr->to_socket->name_len == 0 && ucr->to_socket->name) {
ucr->to_socket->name_len = strlen(ucr->to_socket->name);
}
}
}
if (!ucr->pb_base_dir) {
ucr->pb_base_dir = getenv("TMPDIR");
if (!ucr->pb_base_dir)
ucr->pb_base_dir = "/tmp";
}
int nevents;
time_t delta;
struct uwsgi_rb_timer *min_timeout;
int new_connection;
if (ucr->pattern) {
init_magic_table(ucr->magic_table);
}
union uwsgi_sockaddr cr_addr;
socklen_t cr_addr_len = sizeof(struct sockaddr_un);
ucr->mapper = uwsgi_cr_map_use_void;
if (ucr->use_cache) {
ucr->cache = uwsgi_cache_by_name(ucr->use_cache);
if (!ucr->cache) {
uwsgi_log("!!! unable to find cache \"%s\" !!!\n", ucr->use_cache);
exit(1);
}
ucr->mapper = uwsgi_cr_map_use_cache;
}
else if (ucr->pattern) {
ucr->mapper = uwsgi_cr_map_use_pattern;
}
else if (ucr->has_subscription_sockets) {
ucr->mapper = uwsgi_cr_map_use_subscription;
if (uwsgi.subscription_dotsplit) {
ucr->mapper = uwsgi_cr_map_use_subscription_dotsplit;
}
}
else if (ucr->base) {
ucr->mapper = uwsgi_cr_map_use_base;
}
else if (ucr->code_string_code && ucr->code_string_function) {
ucr->mapper = uwsgi_cr_map_use_cs;
}
else if (ucr->to_socket) {
ucr->mapper = uwsgi_cr_map_use_to;
}
else if (ucr->static_nodes) {
ucr->mapper = uwsgi_cr_map_use_static_nodes;
}
ucr->timeouts = uwsgi_init_rb_timer();
for (;;) {
time_t now = uwsgi_now();
// set timeouts and harakiri
min_timeout = uwsgi_min_rb_timer(ucr->timeouts, NULL);
if (min_timeout == NULL) {
delta = -1;
}
else {
delta = min_timeout->value - now;
if (delta <= 0) {
corerouter_expire_timeouts(ucr, now);
delta = 0;
}
}
if (uwsgi.master_process && ucr->harakiri > 0) {
ushared->gateways_harakiri[id] = 0;
}
// wait for events
nevents = event_queue_wait_multi(ucr->queue, delta, events, ucr->nevents);
now = uwsgi_now();
if (uwsgi.master_process && ucr->harakiri > 0) {
ushared->gateways_harakiri[id] = now + ucr->harakiri;
}
if (nevents == 0) {
corerouter_expire_timeouts(ucr, now);
}
for (i = 0; i < nevents; i++) {
// get the interesting fd
ucr->interesting_fd = event_queue_interesting_fd(events, i);
// something bad happened
if (ucr->interesting_fd < 0) continue;
// check if the ucr->interesting_fd matches a gateway socket
struct uwsgi_gateway_socket *ugs = uwsgi.gateway_sockets;
int taken = 0;
while (ugs) {
if (ugs->gateway == &ushared->gateways[id] && ucr->interesting_fd == ugs->fd) {
if (!ugs->subscription) {
#if defined(__linux__) && defined(SOCK_NONBLOCK) && !defined(OBSOLETE_LINUX_KERNEL)
new_connection = accept4(ucr->interesting_fd, (struct sockaddr *) &cr_addr, &cr_addr_len, SOCK_NONBLOCK);
if (new_connection < 0) {
taken = 1;
break;
}
#else
new_connection = accept(ucr->interesting_fd, (struct sockaddr *) &cr_addr, &cr_addr_len);
if (new_connection < 0) {
taken = 1;
break;
}
// set socket in non-blocking mode, on non-linux platforms, clients get the server mode
#ifdef __linux__
uwsgi_socket_nb(new_connection);
#endif
#endif
struct corerouter_session *cr = corerouter_alloc_session(ucr, ugs, new_connection, (struct sockaddr *) &cr_addr, cr_addr_len);
//something wrong in the allocation
if (!cr) break;
}
else if (ugs->subscription) {
uwsgi_corerouter_manage_subscription(ucr, id, ugs);
}
taken = 1;
break;
}
ugs = ugs->next;
}
if (taken) {
continue;
}
// manage internal subscription
if (ucr->interesting_fd == ushared->gateways[id].internal_subscription_pipe[1]) {
uwsgi_corerouter_manage_internal_subscription(ucr, ucr->interesting_fd);
}
// manage a stats request
else if (ucr->interesting_fd == ucr->cr_stats_server) {
corerouter_send_stats(ucr);
}
else {
struct corerouter_peer *peer = ucr->cr_table[ucr->interesting_fd];
// something is going wrong...
if (peer == NULL)
continue;
// on error, destroy the session
if (event_queue_interesting_fd_has_error(events, i)) {
peer->failed = 1;
corerouter_close_peer(ucr, peer);
continue;
}
// set timeout (in main_peer too)
peer->timeout = corerouter_reset_timeout_fast(ucr, peer, now);
peer->session->main_peer->timeout = corerouter_reset_timeout_fast(ucr, peer->session->main_peer, now);
ssize_t (*hook)(struct corerouter_peer *) = NULL;
// call event hook
if (event_queue_interesting_fd_is_read(events, i)) {
hook = peer->hook_read;
}
else if (event_queue_interesting_fd_is_write(events, i)) {
hook = peer->hook_write;
}
if (!hook) continue;
// reset errno (as we use it for internal signalling)
errno = 0;
ssize_t ret = hook(peer);
// connection closed
if (ret == 0) {
corerouter_close_peer(ucr, peer);
continue;
}
else if (ret < 0) {
if (errno == EINPROGRESS) continue;
// remove keepalive on error
peer->session->can_keepalive = 0;
corerouter_close_peer(ucr, peer);
continue;
}
}
}
}
}
void emperor_add(struct uwsgi_emperor_scanner *ues, char *name, time_t born, char *config, uint32_t config_size, uid_t uid, gid_t gid) {
struct uwsgi_instance *c_ui = ui;
struct uwsgi_instance *n_ui = NULL;
pid_t pid;
char **vassal_argv;
char *uef;
char **uenvs;
int counter;
char *colon = NULL;
int i;
struct timeval tv;
#ifdef UWSGI_DEBUG
uwsgi_log("\n\nVASSAL %s %d %.*s %d %d\n", name, born, config_size, config, uid, gid);
#endif
if (strlen(name) > (0xff - 1)) {
uwsgi_log("[emperor] invalid vassal name\n", name);
return;
}
gettimeofday(&tv, NULL);
int now = tv.tv_sec;
uint64_t micros = (tv.tv_sec * 1000 * 1000) + tv.tv_usec;
// blacklist check
struct uwsgi_emperor_blacklist_item *uebi = uwsgi_emperor_blacklist_check(name);
if (uebi) {
uint64_t i_micros = (uebi->last_attempt.tv_sec * 1000 * 1000) + uebi->last_attempt.tv_usec + uebi->throttle_level;
if (i_micros > micros) {
return;
}
}
if (now - emperor_throttle < 1) {
emperor_throttle_level = emperor_throttle_level * 2;
}
else {
if (emperor_throttle_level > uwsgi.emperor_throttle) {
emperor_throttle_level = emperor_throttle_level / 2;
}
if (emperor_throttle_level < uwsgi.emperor_throttle) {
emperor_throttle_level = uwsgi.emperor_throttle;
}
}
emperor_throttle = now;
#ifdef UWSGI_DEBUG
uwsgi_log("emperor throttle = %d\n", emperor_throttle_level);
#endif
usleep(emperor_throttle_level);
if (uwsgi.emperor_tyrant) {
if (uid == 0 || gid == 0) {
uwsgi_log("[emperor-tyrant] invalid permissions for vassal %s\n", name);
return;
}
}
while (c_ui->ui_next) {
c_ui = c_ui->ui_next;
}
n_ui = uwsgi_malloc(sizeof(struct uwsgi_instance));
memset(n_ui, 0, sizeof(struct uwsgi_instance));
if (config) {
n_ui->use_config = 1;
n_ui->config = config;
n_ui->config_len = config_size;
}
c_ui->ui_next = n_ui;
#ifdef UWSGI_DEBUG
uwsgi_log("c_ui->ui_next = %p\n", c_ui->ui_next);
#endif
n_ui->ui_prev = c_ui;
if (strchr(name, ':')) {
n_ui->zerg = 1;
uwsgi.emperor_broodlord_count++;
}
n_ui->scanner = ues;
memcpy(n_ui->name, name, strlen(name));
n_ui->born = born;
n_ui->uid = uid;
n_ui->gid = gid;
n_ui->last_mod = born;
// start without loyalty
n_ui->last_loyal = 0;
n_ui->loyal = 0;
n_ui->first_run = uwsgi_now();
n_ui->last_run = n_ui->first_run;
if (socketpair(AF_UNIX, SOCK_STREAM, 0, n_ui->pipe)) {
uwsgi_error("socketpair()");
goto clear;
}
event_queue_add_fd_read(uwsgi.emperor_queue, n_ui->pipe[0]);
if (n_ui->use_config) {
if (socketpair(AF_UNIX, SOCK_STREAM, 0, n_ui->pipe_config)) {
uwsgi_error("socketpair()");
goto clear;
}
}
// TODO pre-start hook
// a new uWSGI instance will start
pid = fork();
if (pid < 0) {
uwsgi_error("fork()")
}
else if (pid > 0) {
n_ui->pid = pid;
// close the right side of the pipe
close(n_ui->pipe[1]);
if (n_ui->use_config) {
close(n_ui->pipe_config[1]);
}
if (n_ui->use_config) {
if (write(n_ui->pipe_config[0], n_ui->config, n_ui->config_len) <= 0) {
uwsgi_error("write()");
}
close(n_ui->pipe_config[0]);
}
return;
}
else {
if (uwsgi.emperor_tyrant) {
uwsgi_log("[emperor-tyrant] dropping privileges to %d %d for instance %s\n", (int) uid, (int) gid, name);
if (setgid(gid)) {
uwsgi_error("setgid()");
exit(1);
}
if (setgroups(0, NULL)) {
uwsgi_error("setgroups()");
exit(1);
}
if (setuid(uid)) {
uwsgi_error("setuid()");
exit(1);
}
}
unsetenv("UWSGI_RELOADS");
unsetenv("NOTIFY_SOCKET");
uef = uwsgi_num2str(n_ui->pipe[1]);
if (setenv("UWSGI_EMPEROR_FD", uef, 1)) {
uwsgi_error("setenv()");
exit(1);
}
free(uef);
if (n_ui->use_config) {
uef = uwsgi_num2str(n_ui->pipe_config[1]);
if (setenv("UWSGI_EMPEROR_FD_CONFIG", uef, 1)) {
uwsgi_error("setenv()");
exit(1);
}
free(uef);
}
uenvs = environ;
while (*uenvs) {
if (!strncmp(*uenvs, "UWSGI_VASSAL_", 13)) {
char *ne = uwsgi_concat2("UWSGI_", *uenvs + 13);
char *oe = uwsgi_concat2n(*uenvs, strchr(*uenvs, '=') - *uenvs, "", 0);
if (unsetenv(oe)) {
uwsgi_error("unsetenv()");
break;
}
free(oe);
#ifdef UWSGI_DEBUG
uwsgi_log("putenv %s\n", ne);
#endif
if (putenv(ne)) {
uwsgi_error("putenv()");
}
// do not free ne as putenv will add it to the environ
uenvs = environ;
continue;
}
uenvs++;
}
// close the left side of the pipe
close(n_ui->pipe[0]);
if (n_ui->use_config) {
close(n_ui->pipe_config[0]);
}
counter = 4;
struct uwsgi_string_list *uct = uwsgi.vassals_templates;
while (uct) {
counter += 2;
uct = uct->next;
}
vassal_argv = uwsgi_malloc(sizeof(char *) * counter);
// set args
vassal_argv[0] = uwsgi.binary_path;
if (uwsgi.emperor_broodlord) {
colon = strchr(name, ':');
if (colon) {
colon[0] = 0;
}
}
// initialize to a default value
vassal_argv[1] = "--inherit";
if (!strcmp(name + (strlen(name) - 4), ".xml"))
vassal_argv[1] = "--xml";
if (!strcmp(name + (strlen(name) - 4), ".ini"))
vassal_argv[1] = "--ini";
if (!strcmp(name + (strlen(name) - 4), ".yml"))
vassal_argv[1] = "--yaml";
if (!strcmp(name + (strlen(name) - 5), ".yaml"))
vassal_argv[1] = "--yaml";
if (!strcmp(name + (strlen(name) - 3), ".js"))
vassal_argv[1] = "--json";
if (!strcmp(name + (strlen(name) - 5), ".json"))
vassal_argv[1] = "--json";
if (colon) {
colon[0] = ':';
}
vassal_argv[2] = name;
if (uwsgi.emperor_magic_exec) {
if (!access(name, R_OK | X_OK)) {
vassal_argv[2] = uwsgi_concat2("exec://", name);
}
}
if (n_ui->use_config) {
vassal_argv[2] = uwsgi_concat2("emperor://", name);
}
counter = 3;
uct = uwsgi.vassals_templates;
while (uct) {
vassal_argv[counter] = "--inherit";
vassal_argv[counter + 1] = uct->value;
counter += 2;
uct = uct->next;
}
vassal_argv[counter] = NULL;
// disable stdin
int stdin_fd = open("/dev/null", O_RDONLY);
if (stdin_fd < 0) {
uwsgi_error_open("/dev/null");
exit(1);
}
if (stdin_fd != 0) {
if (dup2(stdin_fd, 0)) {
uwsgi_error("dup2()");
exit(1);
}
close(stdin_fd);
}
// close all of the unneded fd
for (i = 3; i < (int) uwsgi.max_fd; i++) {
if (n_ui->use_config) {
if (i == n_ui->pipe_config[1])
continue;
}
if (i != n_ui->pipe[1]) {
close(i);
}
}
if (uwsgi.vassals_start_hook) {
uwsgi_log("[emperor] running vassal start-hook: %s %s\n", uwsgi.vassals_start_hook, n_ui->name);
if (uwsgi.emperor_absolute_dir) {
if (setenv("UWSGI_VASSALS_DIR", uwsgi.emperor_absolute_dir, 1)) {
uwsgi_error("setenv()");
}
}
int start_hook_ret = uwsgi_run_command_and_wait(uwsgi.vassals_start_hook, n_ui->name);
uwsgi_log("[emperor] %s start-hook returned %d\n", n_ui->name, start_hook_ret);
}
// start !!!
if (execvp(vassal_argv[0], vassal_argv)) {
uwsgi_error("execvp()");
}
uwsgi_log("[emperor] is the uwsgi binary in your system PATH ?\n");
// never here
exit(UWSGI_EXILE_CODE);
}
clear:
free(n_ui);
c_ui->ui_next = NULL;
}
/*
the offload task starts soon after the call to connect()
status:
0 -> waiting for connection on fd
1 -> sending request to fd (write event)
2 -> start waiting for read on s and fd
3 -> write to s
4 -> write to fd
*/
static int u_offload_transfer_do(struct uwsgi_thread *ut, struct uwsgi_offload_request *uor, int fd) {
ssize_t rlen;
// setup
if (fd == -1) {
event_queue_add_fd_write(ut->queue, uor->fd);
return 0;
}
switch(uor->status) {
// waiting for connection
case 0:
if (fd == uor->fd) {
uor->status = 1;
// ok try to send the request right now...
return u_offload_transfer_do(ut, uor, fd);
}
return -1;
// write event (or just connected)
case 1:
if (fd == uor->fd) {
rlen = write(uor->fd, uor->ubuf->buf + uor->written, uor->ubuf->pos-uor->written);
if (rlen > 0) {
uor->written += rlen;
if (uor->written >= (size_t)uor->ubuf->pos) {
uor->status = 2;
if (event_queue_add_fd_read(ut->queue, uor->s)) return -1;
if (event_queue_fd_write_to_read(ut->queue, uor->fd)) return -1;
}
return 0;
}
else if (rlen < 0) {
uwsgi_offload_retry
uwsgi_error("u_offload_transfer_do() -> write()");
}
}
return -1;
// read event from s or fd
case 2:
if (!uor->buf) {
uor->buf = uwsgi_malloc(4096);
}
if (fd == uor->fd) {
rlen = read(uor->fd, uor->buf, 4096);
if (rlen > 0) {
uor->to_write = rlen;
uor->pos = 0;
uwsgi_offload_0r_1w(uor->fd, uor->s)
uor->status = 3;
return 0;
}
if (rlen < 0) {
uwsgi_offload_retry
uwsgi_error("u_offload_transfer_do() -> read()/fd");
}
}
else if (fd == uor->s) {
rlen = read(uor->s, uor->buf, 4096);
if (rlen > 0) {
uor->to_write = rlen;
uor->pos = 0;
uwsgi_offload_0r_1w(uor->s, uor->fd)
uor->status = 4;
return 0;
}
if (rlen < 0) {
uwsgi_offload_retry
uwsgi_error("u_offload_transfer_do() -> read()/s");
}
}
return -1;
// write event on s
case 3:
rlen = write(uor->s, uor->buf + uor->pos, uor->to_write);
if (rlen > 0) {
uor->to_write -= rlen;
uor->pos += rlen;
if (uor->to_write == 0) {
if (event_queue_fd_write_to_read(ut->queue, uor->s)) return -1;
if (event_queue_add_fd_read(ut->queue, uor->fd)) return -1;
uor->status = 2;
}
return 0;
}
else if (rlen < 0) {
uwsgi_offload_retry
uwsgi_error("u_offload_transfer_do() -> write()/s");
}
return -1;
// write event on fd
case 4:
rlen = write(uor->fd, uor->buf + uor->pos, uor->to_write);
if (rlen > 0) {
uor->to_write -= rlen;
uor->pos += rlen;
if (uor->to_write == 0) {
if (event_queue_fd_write_to_read(ut->queue, uor->fd)) return -1;
if (event_queue_add_fd_read(ut->queue, uor->s)) return -1;
uor->status = 2;
}
return 0;
}
else if (rlen < 0) {
uwsgi_offload_retry
uwsgi_error("u_offload_transfer_do() -> write()/fd");
}
return -1;
default:
break;
}
return -1;
}
void fastrouter_loop() {
int nevents;
int interesting_fd;
int new_connection;
ssize_t len;
int i;
time_t delta;
char bbuf[UMAX16];
char *tcp_port;
char *tmp_socket_name;
int tmp_socket_name_len;
struct uwsgi_subscribe_req usr;
char *magic_table[0xff];
struct uwsgi_rb_timer *min_timeout;
void *events;
struct msghdr msg;
union {
struct cmsghdr cmsg;
char control [CMSG_SPACE (sizeof (int))];
} msg_control;
struct cmsghdr *cmsg;
struct sockaddr_un fr_addr;
socklen_t fr_addr_len = sizeof(struct sockaddr_un);
struct fastrouter_session *fr_session;
struct fastrouter_session *fr_table[2048];
struct iovec iov[2];
int soopt;
socklen_t solen = sizeof(int);
int ufr_subserver = -1;
for(i=0;i<2048;i++) {
fr_table[i] = NULL;
}
ufr.queue = event_queue_init();
struct uwsgi_fastrouter_socket *ufr_sock = ufr.sockets;
while(ufr_sock) {
if (ufr_sock->name[0] == '=') {
int shared_socket = atoi(ufr_sock->name+1);
if (shared_socket >= 0) {
ufr_sock->fd = uwsgi_get_shared_socket_fd_by_num(shared_socket);
if (ufr_sock->fd == -1) {
uwsgi_log("unable to use shared socket %d\n", shared_socket);
}
}
}
else {
tcp_port = strchr(ufr_sock->name, ':');
if (tcp_port) {
ufr_sock->fd = bind_to_tcp(ufr_sock->name, uwsgi.listen_queue, tcp_port);
}
else {
ufr_sock->fd = bind_to_unix(ufr_sock->name, uwsgi.listen_queue, uwsgi.chmod_socket, uwsgi.abstract_socket);
}
}
uwsgi_log("uwsgi fastrouter/proxy bound on %s\n", ufr_sock->name);
if (!ufr.cheap) {
event_queue_add_fd_read(ufr.queue, ufr_sock->fd);
}
else {
uwsgi_log("[uwsgi-fastrouter] cheap mode requested. Waiting for subscriptions...\n");
ufr.i_am_cheap = 1;
}
ufr_sock = ufr_sock->next;
}
events = event_queue_alloc(ufr.nevents);
ufr.timeouts = uwsgi_init_rb_timer();
if (!ufr.socket_timeout) ufr.socket_timeout = 30;
if (ufr.subscription_server) {
ufr_subserver = bind_to_udp(ufr.subscription_server, 0, 0);
event_queue_add_fd_read(ufr.queue, ufr_subserver);
if (!ufr.subscription_slot) ufr.subscription_slot = 30;
// check for node status every 10 seconds
//ufr.subscriptions_check = add_check_timeout(10);
}
if (ufr.pattern) {
init_magic_table(magic_table);
}
for (;;) {
min_timeout = uwsgi_min_rb_timer(ufr.timeouts);
if (min_timeout == NULL ) {
delta = -1;
}
else {
delta = min_timeout->key - time(NULL);
if (delta <= 0) {
expire_timeouts(fr_table);
delta = 0;
}
}
nevents = event_queue_wait_multi(ufr.queue, delta, events, ufr.nevents);
if (nevents == 0) {
expire_timeouts(fr_table);
}
for (i=0;i<nevents;i++) {
tmp_socket_name = NULL;
interesting_fd = event_queue_interesting_fd(events, i);
int taken = 0;
struct uwsgi_fastrouter_socket *uwsgi_sock = ufr.sockets;
while(uwsgi_sock) {
if (interesting_fd == uwsgi_sock->fd) {
new_connection = accept(interesting_fd, (struct sockaddr *) &fr_addr, &fr_addr_len);
if (new_connection < 0) {
continue;
}
fr_table[new_connection] = alloc_fr_session();
fr_table[new_connection]->fd = new_connection;
fr_table[new_connection]->instance_fd = -1;
fr_table[new_connection]->status = FASTROUTER_STATUS_RECV_HDR;
fr_table[new_connection]->h_pos = 0;
fr_table[new_connection]->pos = 0;
fr_table[new_connection]->un = NULL;
fr_table[new_connection]->instance_failed = 0;
fr_table[new_connection]->instance_address_len = 0;
fr_table[new_connection]->hostname_len = 0;
fr_table[new_connection]->hostname = NULL;
fr_table[new_connection]->timeout = add_timeout(fr_table[new_connection]);
event_queue_add_fd_read(ufr.queue, new_connection);
taken = 1;
break;
}
uwsgi_sock = uwsgi_sock->next;
}
if (taken) {
continue;
}
if (interesting_fd == ufr_subserver) {
len = recv(ufr_subserver, bbuf, 4096, 0);
#ifdef UWSGI_EVENT_USE_PORT
event_queue_add_fd_read(ufr.queue, ufr_subserver);
#endif
if (len > 0) {
memset(&usr, 0, sizeof(struct uwsgi_subscribe_req));
uwsgi_hooked_parse(bbuf+4, len-4, fastrouter_manage_subscription, &usr);
if (uwsgi_add_subscribe_node(&ufr.subscriptions, &usr, ufr.subscription_regexp) && ufr.i_am_cheap) {
struct uwsgi_fastrouter_socket *ufr_sock = ufr.sockets;
while(ufr_sock) {
event_queue_add_fd_read(ufr.queue, ufr_sock->fd);
ufr_sock = ufr_sock->next;
}
ufr.i_am_cheap = 0;
uwsgi_log("[uwsgi-fastrouter] leaving cheap mode...\n");
}
}
}
else {
fr_session = fr_table[interesting_fd];
// something is going wrong...
if (fr_session == NULL) continue;
if (event_queue_interesting_fd_has_error(events, i)) {
close_session(fr_table, fr_session);
continue;
}
fr_session->timeout = reset_timeout(fr_session);
switch(fr_session->status) {
case FASTROUTER_STATUS_RECV_HDR:
len = recv(fr_session->fd, (char *)(&fr_session->uh) + fr_session->h_pos, 4-fr_session->h_pos, 0);
if (len <= 0) {
uwsgi_error("recv()");
close_session(fr_table, fr_session);
break;
}
fr_session->h_pos += len;
if (fr_session->h_pos == 4) {
#ifdef UWSGI_DEBUG
uwsgi_log("modifier1: %d pktsize: %d modifier2: %d\n", fr_session->uh.modifier1, fr_session->uh.pktsize, fr_session->uh.modifier2);
#endif
fr_session->status = FASTROUTER_STATUS_RECV_VARS;
}
break;
case FASTROUTER_STATUS_RECV_VARS:
len = recv(fr_session->fd, fr_session->buffer + fr_session->pos, fr_session->uh.pktsize - fr_session->pos, 0);
if (len <= 0) {
uwsgi_error("recv()");
close_session(fr_table, fr_session);
break;
}
fr_session->pos += len;
if (fr_session->pos == fr_session->uh.pktsize) {
if (uwsgi_hooked_parse(fr_session->buffer, fr_session->uh.pktsize, fr_get_hostname, (void *) fr_session)) {
close_session(fr_table, fr_session);
break;
}
if (fr_session->hostname_len == 0) {
close_session(fr_table, fr_session);
break;
}
#ifdef UWSGI_DEBUG
//uwsgi_log("requested domain %.*s\n", fr_session->hostname_len, fr_session->hostname);
#endif
if (ufr.use_cache) {
fr_session->instance_address = uwsgi_cache_get(fr_session->hostname, fr_session->hostname_len, &fr_session->instance_address_len);
char *cs_mod = uwsgi_str_contains(fr_session->instance_address, fr_session->instance_address_len, ',');
if (cs_mod) {
fr_session->modifier1 = uwsgi_str_num(cs_mod+1, (fr_session->instance_address_len - (cs_mod - fr_session->instance_address))-1);
fr_session->instance_address_len = (cs_mod - fr_session->instance_address);
}
}
else if (ufr.pattern) {
magic_table['s'] = uwsgi_concat2n(fr_session->hostname, fr_session->hostname_len, "", 0);
tmp_socket_name = magic_sub(ufr.pattern, ufr.pattern_len, &tmp_socket_name_len, magic_table);
free(magic_table['s']);
fr_session->instance_address_len = tmp_socket_name_len;
fr_session->instance_address = tmp_socket_name;
}
else if (ufr.subscription_server) {
fr_session->un = uwsgi_get_subscribe_node(&ufr.subscriptions, fr_session->hostname, fr_session->hostname_len, ufr.subscription_regexp);
if (fr_session->un && fr_session->un->len) {
fr_session->instance_address = fr_session->un->name;
fr_session->instance_address_len = fr_session->un->len;
fr_session->modifier1 = fr_session->un->modifier1;
}
}
else if (ufr.base) {
tmp_socket_name = uwsgi_concat2nn(ufr.base, ufr.base_len, fr_session->hostname, fr_session->hostname_len, &tmp_socket_name_len);
fr_session->instance_address_len = tmp_socket_name_len;
fr_session->instance_address = tmp_socket_name;
}
else if (ufr.code_string_code && ufr.code_string_function) {
if (uwsgi.p[ufr.code_string_modifier1]->code_string) {
fr_session->instance_address = uwsgi.p[ufr.code_string_modifier1]->code_string("uwsgi_fastrouter", ufr.code_string_code, ufr.code_string_function, fr_session->hostname, fr_session->hostname_len);
if (fr_session->instance_address) {
fr_session->instance_address_len = strlen(fr_session->instance_address);
char *cs_mod = uwsgi_str_contains(fr_session->instance_address, fr_session->instance_address_len, ',');
if (cs_mod) {
fr_session->modifier1 = uwsgi_str_num(cs_mod+1, (fr_session->instance_address_len - (cs_mod - fr_session->instance_address))-1);
fr_session->instance_address_len = (cs_mod - fr_session->instance_address);
}
}
}
}
// no address found
if (!fr_session->instance_address_len) {
close_session(fr_table, fr_session);
break;
}
fr_session->pass_fd = is_unix(fr_session->instance_address, fr_session->instance_address_len);
fr_session->instance_fd = uwsgi_connectn(fr_session->instance_address, fr_session->instance_address_len, 0, 1);
if (tmp_socket_name) free(tmp_socket_name);
if (fr_session->instance_fd < 0) {
/*
if (ufr.subscription_server) {
if (fr_session->un && fr_session->un->len > 0) {
uwsgi_log("[uwsgi-fastrouter] %.*s => marking %.*s as failed\n", (int) fr_session->hostname_len, fr_session->hostname, (int) fr_session->instance_address_len,fr_session->instance_address);
uwsgi_remove_subscribe_node(&ufr.subscriptions, fr_session->un);
if (ufr.subscriptions == NULL && ufr.cheap && !ufr.i_am_cheap) {
uwsgi_log("[uwsgi-fastrouter] no more nodes available. Going cheap...\n");
struct uwsgi_fastrouter_socket *ufr_sock = ufr.sockets;
while(ufr_sock) {
event_queue_del_fd(ufr.queue, ufr_sock->fd, event_queue_read());
ufr_sock = ufr_sock->next;
}
ufr.i_am_cheap = 1;
}
}
}
*/
fr_session->instance_failed = 1;
close_session(fr_table, fr_session);
break;
}
fr_session->status = FASTROUTER_STATUS_CONNECTING;
fr_table[fr_session->instance_fd] = fr_session;
event_queue_add_fd_write(ufr.queue, fr_session->instance_fd);
}
break;
case FASTROUTER_STATUS_CONNECTING:
if (interesting_fd == fr_session->instance_fd) {
if (getsockopt(fr_session->instance_fd, SOL_SOCKET, SO_ERROR, (void *) (&soopt), &solen) < 0) {
uwsgi_error("getsockopt()");
fr_session->instance_failed = 1;
close_session(fr_table, fr_session);
break;
}
if (soopt) {
uwsgi_log("unable to connect() to uwsgi instance: %s\n", strerror(soopt));
fr_session->instance_failed = 1;
close_session(fr_table, fr_session);
break;
}
fr_session->uh.modifier1 = fr_session->modifier1;
iov[0].iov_base = &fr_session->uh;
iov[0].iov_len = 4;
iov[1].iov_base = fr_session->buffer;
iov[1].iov_len = fr_session->uh.pktsize;
// increment node requests counter
if (fr_session->un)
fr_session->un->requests++;
// fd passing: PERFORMANCE EXTREME BOOST !!!
if (fr_session->pass_fd && !uwsgi.no_fd_passing) {
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = iov;
msg.msg_iovlen = 2;
msg.msg_flags = 0;
msg.msg_control = &msg_control;
msg.msg_controllen = sizeof (msg_control);
cmsg = CMSG_FIRSTHDR (&msg);
cmsg->cmsg_len = CMSG_LEN (sizeof (int));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
memcpy(CMSG_DATA(cmsg), &fr_session->fd, sizeof(int));
if (sendmsg(fr_session->instance_fd, &msg, 0) < 0) {
uwsgi_error("sendmsg()");
}
close_session(fr_table, fr_session);
break;
}
if (writev(fr_session->instance_fd, iov, 2) < 0) {
uwsgi_error("writev()");
close_session(fr_table, fr_session);
break;
}
event_queue_fd_write_to_read(ufr.queue, fr_session->instance_fd);
fr_session->status = FASTROUTER_STATUS_RESPONSE;
}
break;
case FASTROUTER_STATUS_RESPONSE:
// data from instance
if (interesting_fd == fr_session->instance_fd) {
len = recv(fr_session->instance_fd, fr_session->buffer, 0xffff, 0);
if (len <= 0) {
if (len < 0) uwsgi_error("recv()");
close_session(fr_table, fr_session);
break;
}
len = send(fr_session->fd, fr_session->buffer, len, 0);
if (len <= 0) {
if (len < 0) uwsgi_error("send()");
close_session(fr_table, fr_session);
break;
}
// update transfer statistics
if (fr_session->un)
fr_session->un->transferred += len;
}
// body from client
else if (interesting_fd == fr_session->fd) {
//uwsgi_log("receiving body...\n");
len = recv(fr_session->fd, fr_session->buffer, 0xffff, 0);
if (len <= 0) {
if (len < 0) uwsgi_error("recv()");
close_session(fr_table, fr_session);
break;
}
len = send(fr_session->instance_fd, fr_session->buffer, len, 0);
if (len <= 0) {
if (len < 0) uwsgi_error("send()");
close_session(fr_table, fr_session);
break;
}
}
break;
// fallback to destroy !!!
default:
uwsgi_log("unknown event: closing session\n");
close_session(fr_table, fr_session);
break;
}
}
}
}
}
int spool_request(struct uwsgi_spooler *uspool, char *filename, int rn, int core_id, char *buffer, int size, char *priority, time_t at, char *body, size_t body_len) {
struct timeval tv;
int fd;
struct uwsgi_header uh;
if (!uspool) {
uspool = uwsgi.spoolers;
}
// this lock is for threads, the pid value in filename will avoid multiprocess races
uwsgi_lock(uspool->lock);
gettimeofday(&tv, NULL);
if (priority) {
if (snprintf(filename, 1024, "%s/%s", uspool->dir, priority) <= 0) {
uwsgi_unlock(uspool->lock);
return 0;
}
// no need to check for errors...
(void) mkdir(filename, 0777);
if (snprintf(filename, 1024, "%s/%s/uwsgi_spoolfile_on_%s_%d_%d_%d_%llu_%llu", uspool->dir, priority, uwsgi.hostname, (int) getpid(), rn, core_id, (unsigned long long) tv.tv_sec, (unsigned long long) tv.tv_usec) <= 0) {
uwsgi_unlock(uspool->lock);
return 0;
}
}
else {
if (snprintf(filename, 1024, "%s/uwsgi_spoolfile_on_%s_%d_%d_%d_%llu_%llu", uspool->dir, uwsgi.hostname, (int) getpid(), rn, core_id, (unsigned long long) tv.tv_sec, (unsigned long long) tv.tv_usec) <= 0) {
uwsgi_unlock(uspool->lock);
return 0;
}
}
fd = open(filename, O_CREAT | O_EXCL | O_WRONLY, S_IRUSR | S_IWUSR);
if (fd < 0) {
uwsgi_error_open(filename);
uwsgi_unlock(uspool->lock);
return 0;
}
// now lock the file, it will no be runnable, until the lock is not removed
// a race could come if the spooler take the file before fcntl is called
// in such case the spooler will detect a zeroed file and will retry later
if (uwsgi_fcntl_lock(fd)) {
close(fd);
uwsgi_unlock(uspool->lock);
return 0;
}
uh.modifier1 = 17;
uh.modifier2 = 0;
uh.pktsize = (uint16_t) size;
#ifdef __BIG_ENDIAN__
uh.pktsize = uwsgi_swap16(uh.pktsize);
#endif
if (write(fd, &uh, 4) != 4) {
goto clear;
}
if (write(fd, buffer, size) != size) {
goto clear;
}
if (body && body_len > 0) {
if ((size_t)write(fd, body, body_len) != body_len) {
goto clear;
}
}
if (at > 0) {
struct timeval tv[2];
tv[0].tv_sec = at;
tv[0].tv_usec = 0;
tv[1].tv_sec = at;
tv[1].tv_usec = 0;
#ifdef __sun__
if (futimesat(fd, NULL, tv)) {
#else
if (futimes(fd, tv)) {
#endif
uwsgi_error("futimes()");
}
}
// here the file will be unlocked too
close(fd);
if (!uwsgi.spooler_quiet)
uwsgi_log("[spooler] written %d bytes to file %s\n", size + body_len + 4, filename);
// and here waiting threads can continue
uwsgi_unlock(uspool->lock);
/* wake up the spoolers attached to the specified dir ... (HACKY)
no need to fear races, as USR1 is harmless an all of the uWSGI processes...
it could be a problem if a new process takes the old pid, but modern systems should avoid that
*/
struct uwsgi_spooler *spoolers = uwsgi.spoolers;
while(spoolers) {
if (!strcmp(spoolers->dir, uspool->dir)) {
if (spoolers->pid > 0 && spoolers->running == 0) {
(void) kill(spoolers->pid, SIGUSR1);
}
}
spoolers = spoolers->next;
}
return 1;
clear:
uwsgi_unlock(uspool->lock);
uwsgi_error("write()");
if (unlink(filename)) {
uwsgi_error("unlink()");
}
// unlock the file too
close(fd);
return 0;
}
void spooler(struct uwsgi_spooler *uspool) {
// prevent process blindly reading stdin to make mess
int nullfd;
// asked by Marco Beri
#ifdef __HAIKU__
#ifdef UWSGI_DEBUG
uwsgi_log("lowering spooler priority to %d\n", B_LOW_PRIORITY);
#endif
set_thread_priority(find_thread(NULL), B_LOW_PRIORITY);
#else
#ifdef UWSGI_DEBUG
uwsgi_log("lowering spooler priority to %d\n", PRIO_MAX);
#endif
setpriority(PRIO_PROCESS, getpid(), PRIO_MAX);
#endif
nullfd = open("/dev/null", O_RDONLY);
if (nullfd < 0) {
uwsgi_error_open("/dev/null");
exit(1);
}
if (nullfd != 0) {
dup2(nullfd, 0);
close(nullfd);
}
int spooler_event_queue = event_queue_init();
int interesting_fd = -1;
if (uwsgi.master_process) {
event_queue_add_fd_read(spooler_event_queue, uwsgi.shared->spooler_signal_pipe[1]);
}
// reset the tasks counter
uspool->tasks = 0;
for (;;) {
if (chdir(uspool->dir)) {
uwsgi_error("chdir()");
exit(1);
}
if (uwsgi.spooler_ordered) {
#ifdef __linux__
spooler_scandir(uspool, NULL);
#else
spooler_readdir(uspool, NULL);
#endif
}
else {
spooler_readdir(uspool, NULL);
}
int timeout = uwsgi.shared->spooler_frequency;
if (wakeup > 0) {
timeout = 0;
}
if (event_queue_wait(spooler_event_queue, timeout, &interesting_fd) > 0) {
if (uwsgi.master_process) {
if (interesting_fd == uwsgi.shared->spooler_signal_pipe[1]) {
uwsgi_receive_signal(interesting_fd, "spooler", (int) getpid());
}
}
}
// avoid races
uint64_t tmp_wakeup = wakeup;
if (tmp_wakeup > 0) {
tmp_wakeup--;
}
wakeup = tmp_wakeup;
// need to recycle ?
if (uwsgi.spooler_max_tasks > 0 && uspool->tasks >= (uint64_t)uwsgi.spooler_max_tasks) {
uwsgi_log("[spooler %s pid: %d] maximum number of tasks reached (%d) recycling ...\n", uspool->dir, (int) uwsgi.mypid, uwsgi.spooler_max_tasks);
end_me(0);
}
}
}
void async_loop() {
if (uwsgi.async < 2) {
uwsgi_log("the async loop engine requires async mode (--async <n>)\n");
exit(1);
}
int interesting_fd, i;
struct uwsgi_rb_timer *min_timeout;
int timeout;
int is_a_new_connection;
int proto_parser_status;
uint64_t now;
struct uwsgi_async_request *current_request = NULL;
void *events = event_queue_alloc(64);
struct uwsgi_socket *uwsgi_sock;
uwsgi.async_runqueue = NULL;
uwsgi.wait_write_hook = async_wait_fd_write;
uwsgi.wait_read_hook = async_wait_fd_read;
if (uwsgi.signal_socket > -1) {
event_queue_add_fd_read(uwsgi.async_queue, uwsgi.signal_socket);
event_queue_add_fd_read(uwsgi.async_queue, uwsgi.my_signal_socket);
}
// set a default request manager
if (!uwsgi.schedule_to_req)
uwsgi.schedule_to_req = async_schedule_to_req;
if (!uwsgi.schedule_to_main) {
uwsgi_log("*** DANGER *** async mode without coroutine/greenthread engine loaded !!!\n");
}
while (uwsgi.workers[uwsgi.mywid].manage_next_request) {
now = (uint64_t) uwsgi_now();
if (uwsgi.async_runqueue) {
timeout = 0;
}
else {
min_timeout = uwsgi_min_rb_timer(uwsgi.rb_async_timeouts, NULL);
if (min_timeout) {
timeout = min_timeout->value - now;
if (timeout <= 0) {
async_expire_timeouts(now);
timeout = 0;
}
}
else {
timeout = -1;
}
}
uwsgi.async_nevents = event_queue_wait_multi(uwsgi.async_queue, timeout, events, 64);
now = (uint64_t) uwsgi_now();
// timeout ???
if (uwsgi.async_nevents == 0) {
async_expire_timeouts(now);
}
for (i = 0; i < uwsgi.async_nevents; i++) {
// manage events
interesting_fd = event_queue_interesting_fd(events, i);
// signals are executed in the main stack... in the future we could have dedicated stacks for them
if (uwsgi.signal_socket > -1 && (interesting_fd == uwsgi.signal_socket || interesting_fd == uwsgi.my_signal_socket)) {
uwsgi_receive_signal(interesting_fd, "worker", uwsgi.mywid);
continue;
}
is_a_new_connection = 0;
// new request coming in ?
uwsgi_sock = uwsgi.sockets;
while (uwsgi_sock) {
if (interesting_fd == uwsgi_sock->fd) {
is_a_new_connection = 1;
uwsgi.wsgi_req = find_first_available_wsgi_req();
if (uwsgi.wsgi_req == NULL) {
uwsgi_async_queue_is_full((time_t)now);
break;
}
// on error re-insert the request in the queue
wsgi_req_setup(uwsgi.wsgi_req, uwsgi.wsgi_req->async_id, uwsgi_sock);
if (wsgi_req_simple_accept(uwsgi.wsgi_req, interesting_fd)) {
uwsgi.async_queue_unused_ptr++;
uwsgi.async_queue_unused[uwsgi.async_queue_unused_ptr] = uwsgi.wsgi_req;
break;
}
if (wsgi_req_async_recv(uwsgi.wsgi_req)) {
uwsgi.async_queue_unused_ptr++;
uwsgi.async_queue_unused[uwsgi.async_queue_unused_ptr] = uwsgi.wsgi_req;
break;
}
// by default the core is in UWSGI_AGAIN mode
uwsgi.wsgi_req->async_status = UWSGI_AGAIN;
// some protocol (like zeromq) do not need additional parsing, just push it in the runqueue
if (uwsgi.wsgi_req->do_not_add_to_async_queue) {
runqueue_push(uwsgi.wsgi_req);
}
break;
}
uwsgi_sock = uwsgi_sock->next;
}
if (!is_a_new_connection) {
// proto event
uwsgi.wsgi_req = find_wsgi_req_proto_by_fd(interesting_fd);
if (uwsgi.wsgi_req) {
proto_parser_status = uwsgi.wsgi_req->socket->proto(uwsgi.wsgi_req);
// reset timeout
async_reset_request(uwsgi.wsgi_req);
// parsing complete
if (!proto_parser_status) {
// remove fd from event poll and fd proto table
uwsgi.async_proto_fd_table[interesting_fd] = NULL;
event_queue_del_fd(uwsgi.async_queue, interesting_fd, event_queue_read());
// put request in the runqueue
runqueue_push(uwsgi.wsgi_req);
continue;
}
else if (proto_parser_status < 0) {
uwsgi.async_proto_fd_table[interesting_fd] = NULL;
close(interesting_fd);
continue;
}
// re-add timer
async_add_timeout(uwsgi.wsgi_req, uwsgi.shared->options[UWSGI_OPTION_SOCKET_TIMEOUT]);
continue;
}
// app-registered event
uwsgi.wsgi_req = find_wsgi_req_by_fd(interesting_fd);
// unknown fd, remove it (for safety)
if (uwsgi.wsgi_req == NULL) {
close(interesting_fd);
continue;
}
// remove all the fd monitors and timeout
async_reset_request(uwsgi.wsgi_req);
uwsgi.wsgi_req->async_ready_fd = 1;
uwsgi.wsgi_req->async_last_ready_fd = interesting_fd;
// put the request in the runqueue again
runqueue_push(uwsgi.wsgi_req);
}
}
// event queue managed, give cpu to runqueue
current_request = uwsgi.async_runqueue;
while(current_request) {
// current_request could be nulled on error/end of request
struct uwsgi_async_request *next_request = current_request->next;
uwsgi.wsgi_req = current_request->wsgi_req;
uwsgi.schedule_to_req();
uwsgi.wsgi_req->switches++;
// request ended ?
if (uwsgi.wsgi_req->async_status <= UWSGI_OK ||
uwsgi.wsgi_req->waiting_fds || uwsgi.wsgi_req->async_timeout) {
// remove from the runqueue
runqueue_remove(current_request);
}
current_request = next_request;
}
}
}
int master_loop(char **argv, char **environ) {
uint64_t tmp_counter;
struct timeval last_respawn;
int last_respawn_rate = 0;
int pid_found = 0;
pid_t diedpid;
int waitpid_status;
uint8_t uwsgi_signal;
time_t last_request_timecheck = 0, now = 0;
uint64_t last_request_count = 0;
pthread_t logger_thread;
pthread_t cache_sweeper;
#ifdef UWSGI_UDP
int udp_fd = -1;
#ifdef UWSGI_MULTICAST
char *cluster_opt_buf = NULL;
size_t cluster_opt_size = 4;
#endif
#endif
#ifdef UWSGI_SNMP
int snmp_fd = -1;
#endif
int i = 0;
int rlen;
int check_interval = 1;
struct uwsgi_rb_timer *min_timeout;
struct rb_root *rb_timers = uwsgi_init_rb_timer();
if (uwsgi.procname_master) {
uwsgi_set_processname(uwsgi.procname_master);
}
else if (uwsgi.procname) {
uwsgi_set_processname(uwsgi.procname);
}
else if (uwsgi.auto_procname) {
uwsgi_set_processname("uWSGI master");
}
uwsgi.current_time = uwsgi_now();
uwsgi_unix_signal(SIGTSTP, suspend_resume_them_all);
uwsgi_unix_signal(SIGHUP, grace_them_all);
if (uwsgi.die_on_term) {
uwsgi_unix_signal(SIGTERM, kill_them_all);
uwsgi_unix_signal(SIGQUIT, reap_them_all);
}
else {
uwsgi_unix_signal(SIGTERM, reap_them_all);
uwsgi_unix_signal(SIGQUIT, kill_them_all);
}
uwsgi_unix_signal(SIGINT, kill_them_all);
uwsgi_unix_signal(SIGUSR1, stats);
if (uwsgi.auto_snapshot) {
uwsgi_unix_signal(SIGURG, uwsgi_restore_auto_snapshot);
}
atexit(uwsgi_master_cleanup_hooks);
uwsgi.master_queue = event_queue_init();
/* route signals to workers... */
#ifdef UWSGI_DEBUG
uwsgi_log("adding %d to signal poll\n", uwsgi.shared->worker_signal_pipe[0]);
#endif
event_queue_add_fd_read(uwsgi.master_queue, uwsgi.shared->worker_signal_pipe[0]);
#ifdef UWSGI_SPOOLER
if (uwsgi.spoolers) {
event_queue_add_fd_read(uwsgi.master_queue, uwsgi.shared->spooler_signal_pipe[0]);
}
#endif
if (uwsgi.mules_cnt > 0) {
event_queue_add_fd_read(uwsgi.master_queue, uwsgi.shared->mule_signal_pipe[0]);
}
if (uwsgi.log_master) {
uwsgi.log_master_buf = uwsgi_malloc(uwsgi.log_master_bufsize);
if (!uwsgi.threaded_logger) {
#ifdef UWSGI_DEBUG
uwsgi_log("adding %d to master logging\n", uwsgi.shared->worker_log_pipe[0]);
#endif
event_queue_add_fd_read(uwsgi.master_queue, uwsgi.shared->worker_log_pipe[0]);
}
else {
if (pthread_create(&logger_thread, NULL, logger_thread_loop, NULL)) {
uwsgi_error("pthread_create()");
uwsgi_log("falling back to non-threaded logger...\n");
event_queue_add_fd_read(uwsgi.master_queue, uwsgi.shared->worker_log_pipe[0]);
uwsgi.threaded_logger = 0;
}
}
#ifdef UWSGI_ALARM
// initialize the alarm subsystem
uwsgi_alarms_init();
#endif
}
if (uwsgi.cache_max_items > 0 && !uwsgi.cache_no_expire) {
if (pthread_create(&cache_sweeper, NULL, cache_sweeper_loop, NULL)) {
uwsgi_error("pthread_create()");
uwsgi_log("unable to run the cache sweeper !!!\n");
}
else {
uwsgi_log("cache sweeper thread enabled\n");
}
}
uwsgi.wsgi_req->buffer = uwsgi.workers[0].cores[0].buffer;
if (uwsgi.has_emperor) {
event_queue_add_fd_read(uwsgi.master_queue, uwsgi.emperor_fd);
}
if (uwsgi.zerg_server) {
uwsgi.zerg_server_fd = bind_to_unix(uwsgi.zerg_server, uwsgi.listen_queue, 0, 0);
event_queue_add_fd_read(uwsgi.master_queue, uwsgi.zerg_server_fd);
uwsgi_log("*** Zerg server enabled on %s ***\n", uwsgi.zerg_server);
}
if (uwsgi.stats) {
char *tcp_port = strchr(uwsgi.stats, ':');
if (tcp_port) {
// disable deferred accept for this socket
int current_defer_accept = uwsgi.no_defer_accept;
uwsgi.no_defer_accept = 1;
uwsgi.stats_fd = bind_to_tcp(uwsgi.stats, uwsgi.listen_queue, tcp_port);
uwsgi.no_defer_accept = current_defer_accept;
}
else {
uwsgi.stats_fd = bind_to_unix(uwsgi.stats, uwsgi.listen_queue, uwsgi.chmod_socket, uwsgi.abstract_socket);
}
event_queue_add_fd_read(uwsgi.master_queue, uwsgi.stats_fd);
uwsgi_log("*** Stats server enabled on %s fd: %d ***\n", uwsgi.stats, uwsgi.stats_fd);
}
#ifdef UWSGI_UDP
if (uwsgi.udp_socket) {
udp_fd = bind_to_udp(uwsgi.udp_socket, 0, 0);
if (udp_fd < 0) {
uwsgi_log("unable to bind to udp socket. SNMP and cluster management services will be disabled.\n");
}
else {
uwsgi_log("UDP server enabled.\n");
event_queue_add_fd_read(uwsgi.master_queue, udp_fd);
}
}
#ifdef UWSGI_MULTICAST
if (uwsgi.cluster) {
event_queue_add_fd_read(uwsgi.master_queue, uwsgi.cluster_fd);
cluster_opt_buf = uwsgi_setup_clusterbuf(&cluster_opt_size);
}
#endif
#endif
#ifdef UWSGI_SNMP
snmp_fd = uwsgi_setup_snmp();
#endif
if (uwsgi.cheap) {
uwsgi_add_sockets_to_queue(uwsgi.master_queue, -1);
for (i = 1; i <= uwsgi.numproc; i++) {
uwsgi.workers[i].cheaped = 1;
}
uwsgi_log("cheap mode enabled: waiting for socket connection...\n");
}
// spawn mules
for (i = 0; i < uwsgi.mules_cnt; i++) {
size_t mule_patch_size = 0;
uwsgi.mules[i].patch = uwsgi_string_get_list(&uwsgi.mules_patches, i, &mule_patch_size);
uwsgi_mule(i + 1);
}
// spawn gateways
for (i = 0; i < ushared->gateways_cnt; i++) {
if (ushared->gateways[i].pid == 0) {
gateway_respawn(i);
}
}
// spawn daemons
uwsgi_daemons_spawn_all();
// first subscription
struct uwsgi_string_list *subscriptions = uwsgi.subscriptions;
while (subscriptions) {
uwsgi_subscribe(subscriptions->value, 0);
subscriptions = subscriptions->next;
}
// sync the cache store if needed
if (uwsgi.cache_store && uwsgi.cache_filesize) {
if (msync(uwsgi.cache_items, uwsgi.cache_filesize, MS_ASYNC)) {
uwsgi_error("msync()");
}
}
if (uwsgi.queue_store && uwsgi.queue_filesize) {
if (msync(uwsgi.queue_header, uwsgi.queue_filesize, MS_ASYNC)) {
uwsgi_error("msync()");
}
}
// update touches timestamps
uwsgi_check_touches(uwsgi.touch_reload);
uwsgi_check_touches(uwsgi.touch_logrotate);
uwsgi_check_touches(uwsgi.touch_logreopen);
// setup cheaper algos
uwsgi.cheaper_algo = uwsgi_cheaper_algo_spare;
if (uwsgi.requested_cheaper_algo) {
uwsgi.cheaper_algo = NULL;
struct uwsgi_cheaper_algo *uca = uwsgi.cheaper_algos;
while (uca) {
if (!strcmp(uca->name, uwsgi.requested_cheaper_algo)) {
uwsgi.cheaper_algo = uca->func;
break;
}
uca = uca->next;
}
if (!uwsgi.cheaper_algo) {
uwsgi_log("unable to find requested cheaper algorithm, falling back to spare\n");
uwsgi.cheaper_algo = uwsgi_cheaper_algo_spare;
}
}
// here really starts the master loop
for (;;) {
//uwsgi_log("uwsgi.ready_to_reload %d %d\n", uwsgi.ready_to_reload, uwsgi.numproc);
// run master_cycle hook for every plugin
for (i = 0; i < uwsgi.gp_cnt; i++) {
if (uwsgi.gp[i]->master_cycle) {
uwsgi.gp[i]->master_cycle();
}
}
for (i = 0; i < 256; i++) {
if (uwsgi.p[i]->master_cycle) {
uwsgi.p[i]->master_cycle();
}
}
uwsgi_daemons_smart_check();
// count the number of active workers
int active_workers = 0;
for (i = 1; i <= uwsgi.numproc; i++) {
if (uwsgi.workers[i].cheaped == 0 && uwsgi.workers[i].pid > 0) {
active_workers++;
}
}
if (uwsgi.to_outworld) {
//uwsgi_log("%d/%d\n", uwsgi.lazy_respawned, uwsgi.numproc);
if (uwsgi.lazy_respawned >= active_workers) {
uwsgi.to_outworld = 0;
uwsgi.master_mercy = 0;
uwsgi.lazy_respawned = 0;
}
}
if (uwsgi_master_check_mercy())
return 0;
if (uwsgi.respawn_workers) {
for (i = 1; i <= uwsgi.respawn_workers; i++) {
if (uwsgi_respawn_worker(i))
return 0;
}
uwsgi.respawn_workers = 0;
}
if (uwsgi.restore_snapshot) {
uwsgi_master_restore_snapshot();
continue;
}
// cheaper management
if (uwsgi.cheaper && !uwsgi.cheap && !uwsgi.to_heaven && !uwsgi.to_hell && !uwsgi.to_outworld && !uwsgi.workers[0].suspended) {
if (!uwsgi_calc_cheaper())
return 0;
}
if ((uwsgi.cheap || uwsgi.ready_to_die >= active_workers) && uwsgi.to_hell) {
// call a series of waitpid to ensure all processes (gateways, mules and daemons) are dead
for (i = 0; i < (ushared->gateways_cnt + uwsgi.daemons_cnt + uwsgi.mules_cnt); i++) {
diedpid = waitpid(WAIT_ANY, &waitpid_status, WNOHANG);
}
uwsgi_log("goodbye to uWSGI.\n");
exit(0);
}
if ((uwsgi.cheap || uwsgi.ready_to_reload >= active_workers) && uwsgi.to_heaven) {
uwsgi_reload(argv);
// never here (unless in shared library mode)
return -1;
}
diedpid = waitpid(WAIT_ANY, &waitpid_status, WNOHANG);
if (diedpid == -1) {
if (errno == ECHILD) {
// something did not work as expected, just assume all has been cleared
if (uwsgi.to_heaven) {
uwsgi.ready_to_reload = uwsgi.numproc;
continue;
}
else if (uwsgi.to_hell) {
uwsgi.ready_to_die = uwsgi.numproc;
continue;
}
else if (uwsgi.to_outworld) {
uwsgi.lazy_respawned = uwsgi.numproc;
uwsgi_log("*** no workers to reload found ***\n");
continue;
}
diedpid = 0;
}
else {
uwsgi_error("waitpid()");
/* here is better to reload all the uWSGI stack */
uwsgi_log("something horrible happened...\n");
reap_them_all(0);
exit(1);
}
}
if (diedpid == 0) {
/* all processes ok, doing status scan after N seconds */
check_interval = uwsgi.shared->options[UWSGI_OPTION_MASTER_INTERVAL];
if (!check_interval)
check_interval = 1;
// add unregistered file monitors
// locking is not needed as monitors can only increase
for (i = 0; i < ushared->files_monitored_cnt; i++) {
if (!ushared->files_monitored[i].registered) {
ushared->files_monitored[i].fd = event_queue_add_file_monitor(uwsgi.master_queue, ushared->files_monitored[i].filename, &ushared->files_monitored[i].id);
ushared->files_monitored[i].registered = 1;
}
}
// add unregistered timers
// locking is not needed as timers can only increase
for (i = 0; i < ushared->timers_cnt; i++) {
if (!ushared->timers[i].registered) {
ushared->timers[i].fd = event_queue_add_timer(uwsgi.master_queue, &ushared->timers[i].id, ushared->timers[i].value);
ushared->timers[i].registered = 1;
}
}
// add unregistered rb_timers
// locking is not needed as rb_timers can only increase
for (i = 0; i < ushared->rb_timers_cnt; i++) {
if (!ushared->rb_timers[i].registered) {
ushared->rb_timers[i].uwsgi_rb_timer = uwsgi_add_rb_timer(rb_timers, uwsgi_now() + ushared->rb_timers[i].value, &ushared->rb_timers[i]);
ushared->rb_timers[i].registered = 1;
}
}
int interesting_fd = -1;
if (ushared->rb_timers_cnt > 0) {
min_timeout = uwsgi_min_rb_timer(rb_timers);
if (min_timeout == NULL) {
check_interval = uwsgi.shared->options[UWSGI_OPTION_MASTER_INTERVAL];
}
else {
check_interval = min_timeout->key - uwsgi_now();
if (check_interval <= 0) {
expire_rb_timeouts(rb_timers);
check_interval = 0;
}
}
}
// wait for event
rlen = event_queue_wait(uwsgi.master_queue, check_interval, &interesting_fd);
if (rlen == 0) {
if (ushared->rb_timers_cnt > 0) {
expire_rb_timeouts(rb_timers);
}
}
// check uwsgi-cron table
if (ushared->cron_cnt) {
uwsgi_manage_signal_cron(uwsgi_now());
}
if (uwsgi.crons) {
uwsgi_manage_command_cron(uwsgi_now());
}
// check for probes
if (ushared->probes_cnt > 0) {
uwsgi_lock(uwsgi.probe_table_lock);
for (i = 0; i < ushared->probes_cnt; i++) {
if (interesting_fd == -1) {
// increment cycles
ushared->probes[i].cycles++;
}
if (ushared->probes[i].func(interesting_fd, &ushared->probes[i])) {
uwsgi_route_signal(ushared->probes[i].sig);
}
}
uwsgi_unlock(uwsgi.probe_table_lock);
}
if (rlen > 0) {
if (uwsgi.log_master && !uwsgi.threaded_logger) {
if (interesting_fd == uwsgi.shared->worker_log_pipe[0]) {
uwsgi_master_log();
goto health_cycle;
}
}
if (uwsgi.stats && uwsgi.stats_fd > -1) {
if (interesting_fd == uwsgi.stats_fd) {
uwsgi_send_stats(uwsgi.stats_fd);
goto health_cycle;
}
}
if (uwsgi.zerg_server) {
if (interesting_fd == uwsgi.zerg_server_fd) {
uwsgi_manage_zerg(uwsgi.zerg_server_fd, 0, NULL);
goto health_cycle;
}
}
if (uwsgi.has_emperor) {
if (interesting_fd == uwsgi.emperor_fd) {
uwsgi_master_manage_emperor();
goto health_cycle;
}
}
if (uwsgi.cheap) {
int found = 0;
struct uwsgi_socket *uwsgi_sock = uwsgi.sockets;
while (uwsgi_sock) {
if (interesting_fd == uwsgi_sock->fd) {
found = 1;
uwsgi.cheap = 0;
uwsgi_del_sockets_from_queue(uwsgi.master_queue);
int needed = uwsgi.numproc;
if (uwsgi.cheaper) {
needed = uwsgi.cheaper_count;
}
for (i = 1; i <= needed; i++) {
if (uwsgi_respawn_worker(i))
return 0;
}
break;
}
uwsgi_sock = uwsgi_sock->next;
}
// here is better to continue instead going to health_cycle
if (found)
continue;
}
#ifdef UWSGI_SNMP
if (uwsgi.snmp_addr && interesting_fd == snmp_fd) {
uwsgi_master_manage_snmp(snmp_fd);
goto health_cycle;
}
#endif
#ifdef UWSGI_UDP
if (uwsgi.udp_socket && interesting_fd == udp_fd) {
uwsgi_master_manage_udp(udp_fd);
goto health_cycle;
}
#ifdef UWSGI_MULTICAST
if (interesting_fd == uwsgi.cluster_fd) {
if (uwsgi_get_dgram(uwsgi.cluster_fd, &uwsgi.workers[0].cores[0].req)) {
goto health_cycle;
}
manage_cluster_message(cluster_opt_buf, cluster_opt_size);
goto health_cycle;
}
#endif
#endif
int next_iteration = 0;
uwsgi_lock(uwsgi.fmon_table_lock);
for (i = 0; i < ushared->files_monitored_cnt; i++) {
if (ushared->files_monitored[i].registered) {
if (interesting_fd == ushared->files_monitored[i].fd) {
struct uwsgi_fmon *uf = event_queue_ack_file_monitor(uwsgi.master_queue, interesting_fd);
// now call the file_monitor handler
if (uf)
uwsgi_route_signal(uf->sig);
break;
}
}
}
uwsgi_unlock(uwsgi.fmon_table_lock);
if (next_iteration)
goto health_cycle;;
next_iteration = 0;
uwsgi_lock(uwsgi.timer_table_lock);
for (i = 0; i < ushared->timers_cnt; i++) {
if (ushared->timers[i].registered) {
if (interesting_fd == ushared->timers[i].fd) {
struct uwsgi_timer *ut = event_queue_ack_timer(interesting_fd);
// now call the file_monitor handler
if (ut)
uwsgi_route_signal(ut->sig);
break;
}
}
}
uwsgi_unlock(uwsgi.timer_table_lock);
if (next_iteration)
goto health_cycle;;
// check for worker signal
if (interesting_fd == uwsgi.shared->worker_signal_pipe[0]) {
rlen = read(interesting_fd, &uwsgi_signal, 1);
if (rlen < 0) {
uwsgi_error("read()");
}
else if (rlen > 0) {
#ifdef UWSGI_DEBUG
uwsgi_log_verbose("received uwsgi signal %d from a worker\n", uwsgi_signal);
#endif
uwsgi_route_signal(uwsgi_signal);
}
else {
uwsgi_log_verbose("lost connection with worker %d\n", i);
close(interesting_fd);
}
goto health_cycle;
}
#ifdef UWSGI_SPOOLER
// check for spooler signal
if (uwsgi.spoolers) {
if (interesting_fd == uwsgi.shared->spooler_signal_pipe[0]) {
rlen = read(interesting_fd, &uwsgi_signal, 1);
if (rlen < 0) {
uwsgi_error("read()");
}
else if (rlen > 0) {
#ifdef UWSGI_DEBUG
uwsgi_log_verbose("received uwsgi signal %d from a spooler\n", uwsgi_signal);
#endif
uwsgi_route_signal(uwsgi_signal);
}
else {
uwsgi_log_verbose("lost connection with the spooler\n");
close(interesting_fd);
}
goto health_cycle;
}
}
#endif
// check for mules signal
if (uwsgi.mules_cnt > 0) {
if (interesting_fd == uwsgi.shared->mule_signal_pipe[0]) {
rlen = read(interesting_fd, &uwsgi_signal, 1);
if (rlen < 0) {
uwsgi_error("read()");
}
else if (rlen > 0) {
#ifdef UWSGI_DEBUG
uwsgi_log_verbose("received uwsgi signal %d from a mule\n", uwsgi_signal);
#endif
uwsgi_route_signal(uwsgi_signal);
}
else {
uwsgi_log_verbose("lost connection with a mule\n");
close(interesting_fd);
}
goto health_cycle;
}
}
}
health_cycle:
now = uwsgi_now();
if (now - uwsgi.current_time < 1) {
continue;
}
uwsgi.current_time = now;
// checking logsize
if (uwsgi.logfile) {
uwsgi_check_logrotate();
}
// this will be incremented at (more or less) regular intervals
uwsgi.master_cycles++;
// recalculate requests counter on race conditions risky configurations
// a bit of inaccuracy is better than locking;)
if (uwsgi.numproc > 1) {
tmp_counter = 0;
for (i = 1; i < uwsgi.numproc + 1; i++)
tmp_counter += uwsgi.workers[i].requests;
uwsgi.workers[0].requests = tmp_counter;
}
if (uwsgi.idle > 0 && !uwsgi.cheap) {
uwsgi.current_time = uwsgi_now();
if (!last_request_timecheck)
last_request_timecheck = uwsgi.current_time;
int busy_workers = 0;
for (i = 1; i <= uwsgi.numproc; i++) {
if (uwsgi.workers[i].cheaped == 0 && uwsgi.workers[i].pid > 0) {
if (uwsgi.workers[i].busy == 1) {
busy_workers = 1;
break;
}
}
}
if (last_request_count != uwsgi.workers[0].requests) {
last_request_timecheck = uwsgi.current_time;
last_request_count = uwsgi.workers[0].requests;
}
// a bit of over-engeneering to avoid clock skews
else if (last_request_timecheck < uwsgi.current_time && (uwsgi.current_time - last_request_timecheck > uwsgi.idle) && !busy_workers) {
uwsgi_log("workers have been inactive for more than %d seconds (%llu-%llu)\n", uwsgi.idle, (unsigned long long) uwsgi.current_time, (unsigned long long) last_request_timecheck);
uwsgi.cheap = 1;
if (uwsgi.die_on_idle) {
if (uwsgi.has_emperor) {
char byte = 22;
if (write(uwsgi.emperor_fd, &byte, 1) != 1) {
uwsgi_error("write()");
kill_them_all(0);
}
}
else {
kill_them_all(0);
}
continue;
}
for (i = 1; i <= uwsgi.numproc; i++) {
uwsgi.workers[i].cheaped = 1;
if (uwsgi.workers[i].pid == 0)
continue;
kill(uwsgi.workers[i].pid, SIGKILL);
if (waitpid(uwsgi.workers[i].pid, &waitpid_status, 0) < 0) {
if (errno != ECHILD)
uwsgi_error("waitpid()");
}
}
uwsgi_add_sockets_to_queue(uwsgi.master_queue, -1);
uwsgi_log("cheap mode enabled: waiting for socket connection...\n");
last_request_timecheck = 0;
continue;
}
}
check_interval = uwsgi.shared->options[UWSGI_OPTION_MASTER_INTERVAL];
if (!check_interval)
check_interval = 1;
#ifdef __linux__
// get listen_queue status
struct uwsgi_socket *uwsgi_sock = uwsgi.sockets;
while (uwsgi_sock) {
if (uwsgi_sock->family == AF_INET) {
get_linux_tcp_info(uwsgi_sock->fd);
}
#ifdef SIOBKLGQ
else if (uwsgi_sock->family == AF_UNIX) {
get_linux_unbit_SIOBKLGQ(uwsgi_sock->fd);
}
#endif
uwsgi_sock = uwsgi_sock->next;
}
#endif
for (i = 1; i <= uwsgi.numproc; i++) {
/* first check for harakiri */
if (uwsgi.workers[i].harakiri > 0) {
if (uwsgi.workers[i].harakiri < (time_t) uwsgi.current_time) {
trigger_harakiri(i);
}
}
/* then user-defined harakiri */
if (uwsgi.workers[i].user_harakiri > 0) {
if (uwsgi.workers[i].user_harakiri < (time_t) uwsgi.current_time) {
trigger_harakiri(i);
}
}
// then for evil memory checkers
if (uwsgi.evil_reload_on_as) {
if ((rlim_t) uwsgi.workers[i].vsz_size >= uwsgi.evil_reload_on_as) {
uwsgi_log("*** EVIL RELOAD ON WORKER %d ADDRESS SPACE: %lld (pid: %d) ***\n", i, (long long) uwsgi.workers[i].vsz_size, uwsgi.workers[i].pid);
kill(uwsgi.workers[i].pid, SIGKILL);
uwsgi.workers[i].vsz_size = 0;
}
}
if (uwsgi.evil_reload_on_rss) {
if ((rlim_t) uwsgi.workers[i].rss_size >= uwsgi.evil_reload_on_rss) {
uwsgi_log("*** EVIL RELOAD ON WORKER %d RSS: %lld (pid: %d) ***\n", i, (long long) uwsgi.workers[i].rss_size, uwsgi.workers[i].pid);
kill(uwsgi.workers[i].pid, SIGKILL);
uwsgi.workers[i].rss_size = 0;
}
}
// need to find a better way
//uwsgi.workers[i].last_running_time = uwsgi.workers[i].running_time;
}
for (i = 0; i < ushared->gateways_cnt; i++) {
if (ushared->gateways_harakiri[i] > 0) {
if (ushared->gateways_harakiri[i] < (time_t) uwsgi.current_time) {
if (ushared->gateways[i].pid > 0) {
kill(ushared->gateways[i].pid, SIGKILL);
}
ushared->gateways_harakiri[i] = 0;
}
}
}
for (i = 0; i < uwsgi.mules_cnt; i++) {
if (uwsgi.mules[i].harakiri > 0) {
if (uwsgi.mules[i].harakiri < (time_t) uwsgi.current_time) {
uwsgi_log("*** HARAKIRI ON MULE %d HANDLING SIGNAL %d (pid: %d) ***\n", i + 1, uwsgi.mules[i].signum, uwsgi.mules[i].pid);
kill(uwsgi.mules[i].pid, SIGKILL);
uwsgi.mules[i].harakiri = 0;
}
}
}
#ifdef UWSGI_SPOOLER
struct uwsgi_spooler *uspool = uwsgi.spoolers;
while (uspool) {
if (uspool->harakiri > 0 && uspool->harakiri < (time_t) uwsgi.current_time) {
uwsgi_log("*** HARAKIRI ON THE SPOOLER (pid: %d) ***\n", uspool->pid);
kill(uspool->pid, SIGKILL);
uspool->harakiri = 0;
}
uspool = uspool->next;
}
#endif
#ifdef __linux__
#ifdef MADV_MERGEABLE
if (uwsgi.linux_ksm > 0 && (uwsgi.master_cycles % uwsgi.linux_ksm) == 0) {
uwsgi_linux_ksm_map();
}
#endif
#endif
#ifdef UWSGI_UDP
// check for cluster nodes
master_check_cluster_nodes();
// reannounce myself every 10 cycles
if (uwsgi.cluster && uwsgi.cluster_fd >= 0 && !uwsgi.cluster_nodes && (uwsgi.master_cycles % 10) == 0) {
uwsgi_cluster_add_me();
}
// resubscribe every 10 cycles by default
if ((uwsgi.subscriptions && ((uwsgi.master_cycles % uwsgi.subscribe_freq) == 0 || uwsgi.master_cycles == 1)) && !uwsgi.to_heaven && !uwsgi.to_hell && !uwsgi.workers[0].suspended) {
struct uwsgi_string_list *subscriptions = uwsgi.subscriptions;
while (subscriptions) {
uwsgi_subscribe(subscriptions->value, 0);
subscriptions = subscriptions->next;
}
}
#endif
if (uwsgi.cache_store && uwsgi.cache_filesize && uwsgi.cache_store_sync && ((uwsgi.master_cycles % uwsgi.cache_store_sync) == 0)) {
if (msync(uwsgi.cache_items, uwsgi.cache_filesize, MS_ASYNC)) {
uwsgi_error("msync()");
}
}
if (uwsgi.queue_store && uwsgi.queue_filesize && uwsgi.queue_store_sync && ((uwsgi.master_cycles % uwsgi.queue_store_sync) == 0)) {
if (msync(uwsgi.queue_header, uwsgi.queue_filesize, MS_ASYNC)) {
uwsgi_error("msync()");
}
}
// check touch_reload
if (!uwsgi.to_heaven && !uwsgi.to_hell) {
char *touched = uwsgi_check_touches(uwsgi.touch_reload);
if (touched) {
uwsgi_log("*** %s has been touched... grace them all !!! ***\n", touched);
uwsgi_block_signal(SIGHUP);
grace_them_all(0);
uwsgi_unblock_signal(SIGHUP);
}
}
continue;
}
// no one died
if (diedpid <= 0)
continue;
// check for deadlocks first
uwsgi_deadlock_check(diedpid);
// reload gateways and daemons only on normal workflow (+outworld status)
if (!uwsgi.to_heaven && !uwsgi.to_hell) {
#ifdef UWSGI_SPOOLER
/* reload the spooler */
struct uwsgi_spooler *uspool = uwsgi.spoolers;
pid_found = 0;
while (uspool) {
if (uspool->pid > 0 && diedpid == uspool->pid) {
uwsgi_log("OOOPS the spooler is no more...trying respawn...\n");
uspool->respawned++;
uspool->pid = spooler_start(uspool);
pid_found = 1;
break;
}
uspool = uspool->next;
}
if (pid_found)
continue;
#endif
pid_found = 0;
for (i = 0; i < uwsgi.mules_cnt; i++) {
if (uwsgi.mules[i].pid == diedpid) {
uwsgi_log("OOOPS mule %d (pid: %d) crippled...trying respawn...\n", i + 1, uwsgi.mules[i].pid);
uwsgi_mule(i + 1);
pid_found = 1;
break;
}
}
if (pid_found)
continue;
/* reload the gateways */
pid_found = 0;
for (i = 0; i < ushared->gateways_cnt; i++) {
if (ushared->gateways[i].pid == diedpid) {
gateway_respawn(i);
pid_found = 1;
break;
}
}
if (pid_found)
continue;
/* reload the daemons */
pid_found = uwsgi_daemon_check_pid_reload(diedpid);
if (pid_found)
continue;
}
/* What happens here ?
case 1) the diedpid is not a worker, report it and continue
case 2) the diedpid is a worker and we are not in a reload procedure -> reload it
case 3) the diedpid is a worker and we are in graceful reload -> uwsgi.ready_to_reload++ and continue
case 3) the diedpid is a worker and we are in brutal reload -> uwsgi.ready_to_die++ and continue
*/
uwsgi.mywid = find_worker_id(diedpid);
if (uwsgi.mywid <= 0) {
// check spooler, mules, gateways and daemons
#ifdef UWSGI_SPOOLER
struct uwsgi_spooler *uspool = uwsgi.spoolers;
while (uspool) {
if (uspool->pid > 0 && diedpid == uspool->pid) {
uwsgi_log("spooler (pid: %d) annihilated\n", (int) diedpid);
goto next;
}
uspool = uspool->next;
}
#endif
for (i = 0; i < uwsgi.mules_cnt; i++) {
if (uwsgi.mules[i].pid == diedpid) {
uwsgi_log("mule %d (pid: %d) annihilated\n", i + 1, (int) diedpid);
goto next;
}
}
for (i = 0; i < ushared->gateways_cnt; i++) {
if (ushared->gateways[i].pid == diedpid) {
uwsgi_log("gateway %d (%s, pid: %d) annihilated\n", i + 1, ushared->gateways[i].fullname, (int) diedpid);
goto next;
}
}
if (uwsgi_daemon_check_pid_death(diedpid)) goto next;
if (WIFEXITED(waitpid_status)) {
uwsgi_log("subprocess %d exited with code %d\n", (int) diedpid, WEXITSTATUS(waitpid_status));
}
else if (WIFSIGNALED(waitpid_status)) {
uwsgi_log("subprocess %d exited by signal %d\n", (int) diedpid, WTERMSIG(waitpid_status));
}
else if (WIFSTOPPED(waitpid_status)) {
uwsgi_log("subprocess %d stopped\n", (int) diedpid);
}
next:
continue;
}
// ok a worker died...
if (uwsgi.to_heaven) {
uwsgi.ready_to_reload++;
uwsgi.workers[uwsgi.mywid].pid = 0;
// only to be safe :P
uwsgi.workers[uwsgi.mywid].harakiri = 0;
continue;
}
else if (uwsgi.to_hell) {
uwsgi.ready_to_die++;
uwsgi.workers[uwsgi.mywid].pid = 0;
// only to be safe :P
uwsgi.workers[uwsgi.mywid].harakiri = 0;
continue;
}
else if (uwsgi.to_outworld) {
uwsgi.lazy_respawned++;
uwsgi.workers[uwsgi.mywid].destroy = 0;
uwsgi.workers[uwsgi.mywid].pid = 0;
// only to be safe :P
uwsgi.workers[uwsgi.mywid].harakiri = 0;
}
if (WIFEXITED(waitpid_status) && WEXITSTATUS(waitpid_status) == UWSGI_FAILED_APP_CODE) {
uwsgi_log("OOPS ! failed loading app in worker %d (pid %d) :( trying again...\n", uwsgi.mywid, (int) diedpid);
}
else if (WIFEXITED(waitpid_status) && WEXITSTATUS(waitpid_status) == UWSGI_DE_HIJACKED_CODE) {
uwsgi_log("...restoring worker %d (pid: %d)...\n", uwsgi.mywid, (int) diedpid);
}
else if (WIFEXITED(waitpid_status) && WEXITSTATUS(waitpid_status) == UWSGI_EXCEPTION_CODE) {
uwsgi_log("... monitored exception detected, respawning worker %d (pid: %d)...\n", uwsgi.mywid, (int) diedpid);
}
else if (WIFEXITED(waitpid_status) && WEXITSTATUS(waitpid_status) == UWSGI_QUIET_CODE) {
// noop
}
else if (uwsgi.workers[uwsgi.mywid].manage_next_request) {
if (WIFSIGNALED(waitpid_status)) {
uwsgi_log("DAMN ! worker %d (pid: %d) died, killed by signal %d :( trying respawn ...\n", uwsgi.mywid, (int) diedpid, (int) WTERMSIG(waitpid_status));
}
else {
uwsgi_log("DAMN ! worker %d (pid: %d) died :( trying respawn ...\n", uwsgi.mywid, (int) diedpid);
}
}
else {
uwsgi_log("DAMN ! worker %d (pid: %d) MISTERIOUSLY died :( trying respawn ...\n", uwsgi.mywid, (int) diedpid);
}
if (uwsgi.workers[uwsgi.mywid].cheaped == 1) {
uwsgi.workers[uwsgi.mywid].pid = 0;
uwsgi_log("uWSGI worker %d cheaped.\n", uwsgi.mywid);
uwsgi.workers[uwsgi.mywid].harakiri = 0;
continue;
}
gettimeofday(&last_respawn, NULL);
if (last_respawn.tv_sec <= uwsgi.respawn_delta + check_interval) {
last_respawn_rate++;
if (last_respawn_rate > uwsgi.numproc) {
if (uwsgi.forkbomb_delay > 0) {
uwsgi_log("worker respawning too fast !!! i have to sleep a bit (%d seconds)...\n", uwsgi.forkbomb_delay);
/* use --forkbomb-delay 0 to disable sleeping */
sleep(uwsgi.forkbomb_delay);
}
last_respawn_rate = 0;
}
}
else {
last_respawn_rate = 0;
}
gettimeofday(&last_respawn, NULL);
uwsgi.respawn_delta = last_respawn.tv_sec;
if (uwsgi_respawn_worker(uwsgi.mywid))
return 0;
// end of the loop
}
// never here
}