int uwsgi_spooler_read_header(char *task, int spool_fd, struct uwsgi_header *uh) {
// check if the file is locked by another process
if (uwsgi_fcntl_is_locked(spool_fd)) {
uwsgi_protected_close(spool_fd);
return -1;
}
// unlink() can destroy the lock !!!
if (access(task, R_OK|W_OK)) {
uwsgi_protected_close(spool_fd);
return -1;
}
ssize_t rlen = uwsgi_protected_read(spool_fd, uh, 4);
if (rlen != 4) {
// it could be here for broken file or just opened one
if (rlen < 0)
uwsgi_error("spooler_manage_task()/read()");
uwsgi_protected_close(spool_fd);
return -1;
}
#ifdef __BIG_ENDIAN__
uh->_pktsize = uwsgi_swap16(uh->_pktsize);
#endif
return 0;
}
void spooler_manage_task(struct uwsgi_spooler *uspool, char *dir, char *task) {
int i, ret;
char spool_buf[0xffff];
struct uwsgi_header uh;
char *body = NULL;
size_t body_len = 0;
int spool_fd;
if (!dir) dir = uspool->dir;
if (!strncmp("uwsgi_spoolfile_on_", task, 19) || (uwsgi.spooler_ordered && is_a_number(task))) {
struct stat sf_lstat;
if (lstat(task, &sf_lstat)) {
return;
}
// a spool request for the future
if (sf_lstat.st_mtime > uwsgi_now()) {
return;
}
#ifdef __linux__
if (S_ISDIR(sf_lstat.st_mode) && uwsgi.spooler_ordered) {
if (chdir(task)) {
uwsgi_error("chdir()");
return;
}
char *prio_path = realpath(".", NULL);
spooler_scandir(uspool, prio_path);
free(prio_path);
if (chdir(dir)) {
uwsgi_error("chdir()");
}
return;
}
#endif
if (!S_ISREG(sf_lstat.st_mode)) {
return;
}
if (!access(task, R_OK | W_OK)) {
spool_fd = open(task, O_RDWR);
if (spool_fd < 0) {
if (errno != ENOENT)
uwsgi_error_open(task);
return;
}
// check if the file is locked by another process
if (uwsgi_fcntl_is_locked(spool_fd)) {
uwsgi_protected_close(spool_fd);
return;
}
// unlink() can destroy the lock !!!
if (access(task, R_OK | W_OK)) {
uwsgi_protected_close(spool_fd);
return;
}
ssize_t rlen = uwsgi_protected_read(spool_fd, &uh, 4);
if (rlen != 4) {
// it could be here for broken file or just opened one
if (rlen < 0)
uwsgi_error("read()");
uwsgi_protected_close(spool_fd);
return;
}
#ifdef __BIG_ENDIAN__
uh.pktsize = uwsgi_swap16(uh.pktsize);
#endif
if (uwsgi_protected_read(spool_fd, spool_buf, uh.pktsize) != uh.pktsize) {
uwsgi_error("read()");
destroy_spool(dir, task);
uwsgi_protected_close(spool_fd);
return;
}
// body available ?
if (sf_lstat.st_size > (uh.pktsize+4)) {
body_len = sf_lstat.st_size - (uh.pktsize+4);
body = uwsgi_malloc(body_len);
if ((size_t)uwsgi_protected_read(spool_fd, body, body_len) != body_len) {
uwsgi_error("read()");
destroy_spool(dir, task);
uwsgi_protected_close(spool_fd);
free(body);
return;
}
}
// now the task is running and should not be waken up
uspool->running = 1;
if (!uwsgi.spooler_quiet)
uwsgi_log("[spooler %s pid: %d] managing request %s ...\n", uspool->dir, (int) uwsgi.mypid, task);
// chdir before running the task (if requested)
if (uwsgi.spooler_chdir) {
if (chdir(uwsgi.spooler_chdir)) {
uwsgi_error("chdir()");
}
}
int callable_found = 0;
for(i=0; i<256; i++) {
if (uwsgi.p[i]->spooler) {
time_t now = uwsgi_now();
if(uwsgi.shared->options[UWSGI_OPTION_SPOOLER_HARAKIRI] > 0) {
set_spooler_harakiri(uwsgi.shared->options[UWSGI_OPTION_SPOOLER_HARAKIRI]);
}
ret = uwsgi.p[i]->spooler(task, spool_buf, uh.pktsize, body, body_len);
if(uwsgi.shared->options[UWSGI_OPTION_SPOOLER_HARAKIRI] > 0) {
set_spooler_harakiri(0);
}
if (ret == 0) continue;
callable_found = 1;
// increase task counter
uspool->tasks++;
if (ret == -2) {
if (!uwsgi.spooler_quiet)
uwsgi_log("[spooler %s pid: %d] done with task %s after %d seconds\n", uspool->dir, (int) uwsgi.mypid, task, uwsgi_now()-now);
destroy_spool(dir, task);
}
// re-spool it
break;
}
}
if (body)
free(body);
// here we free and unlock the task
uwsgi_protected_close(spool_fd);
uspool->running = 0;
if (chdir(dir)) {
uwsgi_error("chdir()");
uwsgi_log("[spooler] something horrible happened to the spooler. Better to kill it.\n");
exit(1);
}
if (!callable_found) {
uwsgi_log("unable to find the spooler function, have you loaded it into the spooler process ?\n");
}
}
}
}