mirror of
https://github.com/clearlinux/uwsgi.git
synced 2026-08-29 02:05:38 +00:00
Roberta Giordano
389 lines
9.2 KiB
C
389 lines
9.2 KiB
C
#include "uwsgi.h"
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/*
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uWSGI offloading subsystem
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*/
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extern struct uwsgi_server uwsgi;
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#define uwsgi_offload_retry if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINPROGRESS) return 0;
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#define uwsgi_offload_0r_1w(x, y) if (event_queue_del_fd(ut->queue, x, event_queue_read())) return -1;\
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if (event_queue_fd_read_to_write(ut->queue, y)) return -1;
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static int uwsgi_offload_net_transfer(struct uwsgi_thread *, struct uwsgi_offload_request *, int);
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static int uwsgi_offload_sendfile_transfer(struct uwsgi_thread *, struct uwsgi_offload_request *, int);
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static void uwsgi_offload_setup(struct uwsgi_offload_request *uor, struct wsgi_request *wsgi_req,
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int (*func)(struct uwsgi_thread *, struct uwsgi_offload_request *, int)) {
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wsgi_req->fd_closed = 1;
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memset(uor, 0, sizeof(struct uwsgi_offload_request));
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uor->s = wsgi_req->poll.fd;
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uor->func = func;
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// put socket in non-blocking mode
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uwsgi_socket_nb(uor->s);
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}
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static int uwsgi_offload_enqueue(struct wsgi_request *wsgi_req, struct uwsgi_offload_request *uor) {
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struct uwsgi_core *uc = &uwsgi.workers[uwsgi.mywid].cores[wsgi_req->async_id];
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uc->offloaded_requests++;
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// round robin
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if (uc->offload_rr >= uwsgi.offload_threads) {
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uc->offload_rr = 0;
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}
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struct uwsgi_thread *ut = uwsgi.offload_thread[uc->offload_rr];
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uc->offload_rr++;
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if (write(ut->pipe[0], uor, sizeof(struct uwsgi_offload_request)) != sizeof(struct uwsgi_offload_request)) {
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return -1;
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}
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return 0;
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}
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int uwsgi_offload_request_net_do(struct wsgi_request *wsgi_req, char *socket, struct uwsgi_buffer *ubuf) {
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// fill offload request
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struct uwsgi_offload_request uor;
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uwsgi_offload_setup(&uor, wsgi_req, uwsgi_offload_net_transfer);
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uor.fd = uwsgi_connect(socket, 0, 1);
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if (uor.fd < 0) {
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uwsgi_error("uwsgi_offload_request_net_do() -> connect()");
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goto error;
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}
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uor.ubuf = ubuf;
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if (uwsgi_offload_enqueue(wsgi_req, &uor)) {
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goto error2;
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}
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return 0;
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error2:
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close(uor.fd);
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error:
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wsgi_req->fd_closed = 0;
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return -1;
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}
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int uwsgi_offload_request_sendfile_do(struct wsgi_request *wsgi_req, char *filename, size_t len) {
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// fill offload request
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struct uwsgi_offload_request uor;
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uwsgi_offload_setup(&uor, wsgi_req, uwsgi_offload_sendfile_transfer);
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uor.fd = open(filename, O_RDONLY | O_NONBLOCK);
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if (uor.fd < 0) {
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uwsgi_error_open(filename);
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goto error;
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}
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// make a fstat to get the file size
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if (!len) {
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struct stat st;
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if (fstat(uor.fd, &st)) {
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uwsgi_error("fstat()");
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goto error2;
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}
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len = st.st_size;
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}
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uor.len = len;
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if (uwsgi_offload_enqueue(wsgi_req, &uor)) {
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goto error2;
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}
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return 0;
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error2:
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close(uor.fd);
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error:
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wsgi_req->fd_closed = 0;
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return -1;
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}
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static void uwsgi_offload_close(struct uwsgi_offload_request *uor) {
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// close the socket and the file descriptor
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close(uor->s);
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close(uor->fd);
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// remove the structure from the linked list;
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struct uwsgi_offload_request *prev = uor->prev;
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struct uwsgi_offload_request *next = uor->next;
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if (uor == uwsgi.offload_requests_head) {
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uwsgi.offload_requests_head = next;
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}
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if (uor == uwsgi.offload_requests_tail) {
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uwsgi.offload_requests_tail = prev;
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}
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if (prev) {
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prev->next = next;
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}
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if (next) {
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next->prev = prev;
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}
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if (uor->buf) {
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free(uor->buf);
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}
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if (uor->ubuf) {
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uwsgi_buffer_destroy(uor->ubuf);
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}
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free(uor);
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}
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static void uwsgi_offload_append(struct uwsgi_offload_request *uor) {
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if (!uwsgi.offload_requests_head) {
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uwsgi.offload_requests_head = uor;
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}
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if (uwsgi.offload_requests_tail) {
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uwsgi.offload_requests_tail->next = uor;
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uor->prev = uwsgi.offload_requests_tail;
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}
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uwsgi.offload_requests_tail = uor;
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}
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static struct uwsgi_offload_request *uwsgi_offload_get_by_fd(int s) {
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struct uwsgi_offload_request *uor = uwsgi.offload_requests_head;
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while (uor) {
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if (uor->s == s || uor->fd == s) {
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return uor;
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}
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uor = uor->next;
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}
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return NULL;
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}
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static void uwsgi_offload_loop(struct uwsgi_thread *ut) {
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int i;
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void *events = event_queue_alloc(uwsgi.offload_threads_events);
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for (;;) {
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int nevents = event_queue_wait_multi(ut->queue, -1, events, uwsgi.offload_threads_events);
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for (i = 0; i < nevents; i++) {
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int interesting_fd = event_queue_interesting_fd(events, i);
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if (interesting_fd == ut->pipe[1]) {
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struct uwsgi_offload_request *uor = uwsgi_malloc(sizeof(struct uwsgi_offload_request));
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ssize_t len = read(ut->pipe[1], uor, sizeof(struct uwsgi_offload_request));
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if (len != sizeof(struct uwsgi_offload_request)) {
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uwsgi_error("read()");
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free(uor);
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continue;
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}
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// start monitoring socket for write
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if (uor->func(ut, uor, -1)) {
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uwsgi_offload_close(uor);
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continue;
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}
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uwsgi_offload_append(uor);
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continue;
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}
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// get the task from the interesting fd
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struct uwsgi_offload_request *uor = uwsgi_offload_get_by_fd(interesting_fd);
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if (!uor)
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continue;
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// run the hook
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if (uor->func(ut, uor, interesting_fd)) {
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uwsgi_offload_close(uor);
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}
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}
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}
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}
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struct uwsgi_thread *uwsgi_offload_thread_start() {
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return uwsgi_thread_new(uwsgi_offload_loop);
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}
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/*
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the offload task starts after having acquired the file fd
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uor->len -> the size of the file
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uor->pos -> start writing from pos (default 0)
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status: none
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*/
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static int uwsgi_offload_sendfile_transfer(struct uwsgi_thread *ut, struct uwsgi_offload_request *uor, int fd) {
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if (fd == -1) {
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if (event_queue_add_fd_write(ut->queue, uor->s)) return -1;
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return 0;
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}
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#if defined(__linux__) || defined(__sun__)
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ssize_t len = sendfile(uor->s, uor->fd, &uor->pos, 128 * 1024);
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if (len > 0) {
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uor->written += len;
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if (uor->written >= uor->len) {
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return -1;
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}
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}
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else if (len < 0) {
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uwsgi_offload_retry
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uwsgi_error("sendfile()");
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}
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#elif defined(__FreeBSD__) || defined(__DragonFly__)
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off_t sbytes = 0;
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int ret = sendfile(uor->fd, uor->s, uor->pos, 0, NULL, &sbytes, 0);
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// transfer finished
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if (ret == -1) {
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uor->pos += sbytes;
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uwsgi_offload_retry
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uwsgi_error("sendfile()");
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}
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#elif defined(__APPLE__)
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off_t len = 0;
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int ret = sendfile(uor->fd, uor->s, uor->pos, &len, NULL, 0);
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// transfer finished
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if (ret == -1) {
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uor->pos += len;
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uwsgi_offload_retry
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uwsgi_error("sendfile()");
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}
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#endif
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return -1;
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}
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/*
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the offload task starts soon after the call to connect()
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status:
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0 -> waiting for connection on fd
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1 -> sending request to fd (write event)
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2 -> start waiting for read on s and fd
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3 -> write to s
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4 -> write to fd
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*/
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static int uwsgi_offload_net_transfer(struct uwsgi_thread *ut, struct uwsgi_offload_request *uor, int fd) {
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ssize_t rlen;
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// setup
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if (fd == -1) {
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event_queue_add_fd_write(ut->queue, uor->fd);
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return 0;
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}
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switch(uor->status) {
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// waiting for connection
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case 0:
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if (fd == uor->fd) {
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uor->status = 1;
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// ok try to send the request right now...
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return uwsgi_offload_net_transfer(ut, uor, fd);
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}
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return -1;
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// write event (or just connected)
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case 1:
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if (fd == uor->fd) {
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rlen = write(uor->fd, uor->ubuf->buf + uor->written, uor->ubuf->pos-uor->written);
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if (rlen > 0) {
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uor->written += rlen;
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if (uor->written >= (size_t)uor->ubuf->pos) {
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uor->status = 2;
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if (event_queue_add_fd_read(ut->queue, uor->s)) return -1;
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if (event_queue_fd_write_to_read(ut->queue, uor->fd)) return -1;
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}
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return 0;
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}
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else if (rlen < 0) {
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uwsgi_offload_retry
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uwsgi_error("uwsgi_offload_net_transfer() -> write()");
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}
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}
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return -1;
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// read event from s or fd
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case 2:
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if (!uor->buf) {
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uor->buf = uwsgi_malloc(4096);
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}
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if (fd == uor->fd) {
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rlen = read(uor->fd, uor->buf, 4096);
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if (rlen > 0) {
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uor->to_write = rlen;
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uor->pos = 0;
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uwsgi_offload_0r_1w(uor->fd, uor->s)
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uor->status = 3;
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return 0;
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}
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if (rlen < 0) {
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uwsgi_offload_retry
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uwsgi_error("uwsgi_offload_net_transfer() -> read()/fd");
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}
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}
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else if (fd == uor->s) {
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rlen = read(uor->fd, uor->buf, 4096);
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if (rlen > 0) {
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uor->to_write = rlen;
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uor->pos = 0;
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uwsgi_offload_0r_1w(uor->s, uor->fd)
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uor->status = 4;
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return 0;
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}
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if (rlen < 0) {
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uwsgi_offload_retry
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uwsgi_error("uwsgi_offload_net_transfer() -> read()/s");
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}
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}
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return -1;
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// write event on s
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case 3:
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rlen = write(uor->s, uor->buf + uor->pos, uor->to_write);
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if (rlen > 0) {
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uor->to_write -= rlen;
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uor->pos += rlen;
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if (uor->to_write == 0) {
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if (event_queue_fd_write_to_read(ut->queue, uor->s)) return -1;
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if (event_queue_add_fd_read(ut->queue, uor->fd)) return -1;
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uor->status = 2;
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}
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return 0;
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}
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else if (rlen < 0) {
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uwsgi_offload_retry
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uwsgi_error("uwsgi_offload_net_transfer() -> write()/s");
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}
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return -1;
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// write event on fd
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case 4:
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rlen = write(uor->fd, uor->buf + uor->pos, uor->to_write);
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if (rlen > 0) {
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uor->to_write -= rlen;
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uor->pos += rlen;
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if (uor->to_write == 0) {
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if (event_queue_fd_write_to_read(ut->queue, uor->fd)) return -1;
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if (event_queue_add_fd_read(ut->queue, uor->s)) return -1;
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uor->status = 2;
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}
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return 0;
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}
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else if (rlen < 0) {
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uwsgi_offload_retry
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uwsgi_error("uwsgi_offload_net_transfer() -> write()/fd");
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}
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return -1;
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default:
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break;
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}
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return -1;
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}
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