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);
}
}
}
/*
CHANGED in 2.0.7: wsgi_req is useless !
*/
char *uwsgi_spool_request(struct wsgi_request *wsgi_req, char *buf, size_t len, char *body, size_t body_len) {
struct timeval tv;
static uint64_t internal_counter = 0;
int fd = -1;
struct spooler_req sr;
if (len > 0xffff) {
uwsgi_log("[uwsgi-spooler] args buffer is limited to 64k, use the 'body' for bigger values\n");
return NULL;
}
// parse the request buffer
memset(&sr, 0, sizeof(struct spooler_req));
uwsgi_hooked_parse(buf, len, spooler_req_parser_hook, &sr);
struct uwsgi_spooler *uspool = uwsgi.spoolers;
if (!uspool) {
uwsgi_log("[uwsgi-spooler] no spooler available\n");
return NULL;
}
// if it is a number, get the spooler by id instead of by name
if (sr.spooler && sr.spooler_len) {
uspool = uwsgi_get_spooler_by_name(sr.spooler, sr.spooler_len);
if (!uspool) {
uwsgi_log("[uwsgi-spooler] unable to find spooler \"%.*s\"\n", sr.spooler_len, sr.spooler);
return NULL;
}
}
// this lock is for threads, the pid value in filename will avoid multiprocess races
uwsgi_lock(uspool->lock);
// we increase it even if the request fails
internal_counter++;
gettimeofday(&tv, NULL);
char *filename = NULL;
size_t filename_len = 0;
if (sr.priority && sr.priority_len) {
filename_len = strlen(uspool->dir) + sr.priority_len + strlen(uwsgi.hostname) + 256;
filename = uwsgi_malloc(filename_len);
int ret = snprintf(filename, filename_len, "%s/%.*s", uspool->dir, (int) sr.priority_len, sr.priority);
if (ret <= 0 || ret >= (int) filename_len) {
uwsgi_log("[uwsgi-spooler] error generating spooler filename\n");
free(filename);
uwsgi_unlock(uspool->lock);
return NULL;
}
// no need to check for errors...
(void) mkdir(filename, 0777);
ret = snprintf(filename, filename_len, "%s/%.*s/uwsgi_spoolfile_on_%s_%d_%llu_%d_%llu_%llu", uspool->dir, (int)sr.priority_len, sr.priority, uwsgi.hostname, (int) getpid(), (unsigned long long) internal_counter, rand(),
(unsigned long long) tv.tv_sec, (unsigned long long) tv.tv_usec);
if (ret <= 0 || ret >=(int) filename_len) {
uwsgi_log("[uwsgi-spooler] error generating spooler filename\n");
free(filename);
uwsgi_unlock(uspool->lock);
return NULL;
}
}
else {
filename_len = strlen(uspool->dir) + strlen(uwsgi.hostname) + 256;
filename = uwsgi_malloc(filename_len);
int ret = snprintf(filename, filename_len, "%s/uwsgi_spoolfile_on_%s_%d_%llu_%d_%llu_%llu", uspool->dir, uwsgi.hostname, (int) getpid(), (unsigned long long) internal_counter,
rand(), (unsigned long long) tv.tv_sec, (unsigned long long) tv.tv_usec);
if (ret <= 0 || ret >= (int) filename_len) {
uwsgi_log("[uwsgi-spooler] error generating spooler filename\n");
free(filename);
uwsgi_unlock(uspool->lock);
return NULL;
}
}
fd = open(filename, O_CREAT | O_EXCL | O_WRONLY, S_IRUSR | S_IWUSR);
if (fd < 0) {
uwsgi_error_open(filename);
free(filename);
uwsgi_unlock(uspool->lock);
return NULL;
}
// 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);
free(filename);
uwsgi_unlock(uspool->lock);
return NULL;
}
struct uwsgi_header uh;
uh.modifier1 = 17;
uh.modifier2 = 0;
uh.pktsize = (uint16_t) len;
#ifdef __BIG_ENDIAN__
uh.pktsize = uwsgi_swap16(uh.pktsize);
#endif
if (write(fd, &uh, 4) != 4) {
uwsgi_log("[spooler] unable to write header for %s\n", filename);
goto clear;
}
if (write(fd, buf, len) != (ssize_t) len) {
uwsgi_log("[spooler] unable to write args for %s\n", filename);
goto clear;
}
if (body && body_len > 0) {
if ((size_t) write(fd, body, body_len) != body_len) {
uwsgi_log("[spooler] unable to write body for %s\n", filename);
goto clear;
}
}
if (sr.at > 0) {
#ifdef __UCLIBC__
struct timespec ts[2];
ts[0].tv_sec = sr.at;
ts[0].tv_nsec = 0;
ts[1].tv_sec = sr.at;
ts[1].tv_nsec = 0;
if (futimens(fd, ts)) {
uwsgi_error("uwsgi_spooler_request()/futimens()");
}
#else
struct timeval tv[2];
tv[0].tv_sec = sr.at;
tv[0].tv_usec = 0;
tv[1].tv_sec = sr.at;
tv[1].tv_usec = 0;
#ifdef __sun__
if (futimesat(fd, NULL, tv)) {
#else
if (futimes(fd, tv)) {
#endif
uwsgi_error("uwsgi_spooler_request()/futimes()");
}
#endif
}
// here the file will be unlocked too
close(fd);
if (!uwsgi.spooler_quiet)
uwsgi_log("[spooler] written %lu bytes to file %s\n", (unsigned long) len + 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 filename;
clear:
uwsgi_unlock(uspool->lock);
uwsgi_error("uwsgi_spool_request()/write()");
if (unlink(filename)) {
uwsgi_error("uwsgi_spool_request()/unlink()");
}
free(filename);
// unlock the file too
close(fd);
return NULL;
}
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 ? uwsgi.shared->spooler_frequency : uwsgi.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;
}
}
