438 lines
15 KiB
C
438 lines
15 KiB
C
// SPDX-License-Identifier: GPL-3.0-or-later
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#define WEB_SERVER_INTERNALS 1
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#include "static-threaded.h"
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int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
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int web_client_first_request_timeout = DEFAULT_TIMEOUT_TO_RECEIVE_FIRST_WEB_REQUEST;
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long web_client_streaming_rate_t = 0L;
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// ----------------------------------------------------------------------------
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// high level web clients connection management
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static struct web_client *web_client_create_on_fd(int fd, const char *client_ip, const char *client_port, int port_acl) {
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struct web_client *w;
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w = web_client_get_from_cache_or_allocate();
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w->ifd = w->ofd = fd;
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strncpyz(w->client_ip, client_ip, sizeof(w->client_ip) - 1);
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strncpyz(w->client_port, client_port, sizeof(w->client_port) - 1);
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if(unlikely(!*w->client_ip)) strcpy(w->client_ip, "-");
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if(unlikely(!*w->client_port)) strcpy(w->client_port, "-");
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w->port_acl = port_acl;
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web_client_initialize_connection(w);
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return(w);
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}
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// --------------------------------------------------------------------------------------
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// the main socket listener - STATIC-THREADED
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struct web_server_static_threaded_worker {
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netdata_thread_t thread;
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int id;
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int running;
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size_t max_sockets;
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volatile size_t connected;
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volatile size_t disconnected;
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volatile size_t receptions;
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volatile size_t sends;
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volatile size_t max_concurrent;
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volatile size_t files_read;
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volatile size_t file_reads;
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};
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static long long static_threaded_workers_count = 1;
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static struct web_server_static_threaded_worker *static_workers_private_data = NULL;
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static __thread struct web_server_static_threaded_worker *worker_private = NULL;
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// ----------------------------------------------------------------------------
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static inline int web_server_check_client_status(struct web_client *w) {
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if(unlikely(web_client_check_dead(w) || (!web_client_has_wait_receive(w) && !web_client_has_wait_send(w))))
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return -1;
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return 0;
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}
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// ----------------------------------------------------------------------------
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// web server files
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static void *web_server_file_add_callback(POLLINFO *pi, short int *events, void *data) {
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struct web_client *w = (struct web_client *)data;
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worker_private->files_read++;
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debug(D_WEB_CLIENT, "%llu: ADDED FILE READ ON FD %d", w->id, pi->fd);
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*events = POLLIN;
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pi->data = w;
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return w;
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}
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static void web_werver_file_del_callback(POLLINFO *pi) {
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struct web_client *w = (struct web_client *)pi->data;
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debug(D_WEB_CLIENT, "%llu: RELEASE FILE READ ON FD %d", w->id, pi->fd);
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w->pollinfo_filecopy_slot = 0;
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if(unlikely(!w->pollinfo_slot)) {
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debug(D_WEB_CLIENT, "%llu: CROSS WEB CLIENT CLEANUP (iFD %d, oFD %d)", w->id, pi->fd, w->ofd);
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web_client_release(w);
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}
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}
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static int web_server_file_read_callback(POLLINFO *pi, short int *events) {
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struct web_client *w = (struct web_client *)pi->data;
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// if there is no POLLINFO linked to this, it means the client disconnected
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// stop the file reading too
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if(unlikely(!w->pollinfo_slot)) {
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debug(D_WEB_CLIENT, "%llu: PREVENTED ATTEMPT TO READ FILE ON FD %d, ON CLOSED WEB CLIENT", w->id, pi->fd);
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return -1;
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}
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if(unlikely(w->mode != WEB_CLIENT_MODE_FILECOPY || w->ifd == w->ofd)) {
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debug(D_WEB_CLIENT, "%llu: PREVENTED ATTEMPT TO READ FILE ON FD %d, ON NON-FILECOPY WEB CLIENT", w->id, pi->fd);
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return -1;
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}
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debug(D_WEB_CLIENT, "%llu: READING FILE ON FD %d", w->id, pi->fd);
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worker_private->file_reads++;
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ssize_t ret = unlikely(web_client_read_file(w));
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if(likely(web_client_has_wait_send(w))) {
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POLLJOB *p = pi->p; // our POLLJOB
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POLLINFO *wpi = pollinfo_from_slot(p, w->pollinfo_slot); // POLLINFO of the client socket
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debug(D_WEB_CLIENT, "%llu: SIGNALING W TO SEND (iFD %d, oFD %d)", w->id, pi->fd, wpi->fd);
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p->fds[wpi->slot].events |= POLLOUT;
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}
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if(unlikely(ret <= 0 || w->ifd == w->ofd)) {
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debug(D_WEB_CLIENT, "%llu: DONE READING FILE ON FD %d", w->id, pi->fd);
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return -1;
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}
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*events = POLLIN;
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return 0;
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}
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static int web_server_file_write_callback(POLLINFO *pi, short int *events) {
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(void)pi;
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(void)events;
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error("Writing to web files is not supported!");
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return -1;
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}
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// ----------------------------------------------------------------------------
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// web server clients
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static void *web_server_add_callback(POLLINFO *pi, short int *events, void *data) {
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(void)data;
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worker_private->connected++;
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size_t concurrent = worker_private->connected - worker_private->disconnected;
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if(unlikely(concurrent > worker_private->max_concurrent))
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worker_private->max_concurrent = concurrent;
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*events = POLLIN;
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debug(D_WEB_CLIENT_ACCESS, "LISTENER on %d: new connection.", pi->fd);
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struct web_client *w = web_client_create_on_fd(pi->fd, pi->client_ip, pi->client_port, pi->port_acl);
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w->pollinfo_slot = pi->slot;
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if(unlikely(pi->socktype == AF_UNIX))
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web_client_set_unix(w);
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else
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web_client_set_tcp(w);
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debug(D_WEB_CLIENT, "%llu: ADDED CLIENT FD %d", w->id, pi->fd);
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return w;
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}
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// TCP client disconnected
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static void web_server_del_callback(POLLINFO *pi) {
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worker_private->disconnected++;
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struct web_client *w = (struct web_client *)pi->data;
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w->pollinfo_slot = 0;
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if(unlikely(w->pollinfo_filecopy_slot)) {
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POLLINFO *fpi = pollinfo_from_slot(pi->p, w->pollinfo_filecopy_slot); // POLLINFO of the client socket
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(void)fpi;
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debug(D_WEB_CLIENT, "%llu: THE CLIENT WILL BE FRED BY READING FILE JOB ON FD %d", w->id, fpi->fd);
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}
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else {
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if(web_client_flag_check(w, WEB_CLIENT_FLAG_DONT_CLOSE_SOCKET))
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pi->flags |= POLLINFO_FLAG_DONT_CLOSE;
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debug(D_WEB_CLIENT, "%llu: CLOSING CLIENT FD %d", w->id, pi->fd);
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web_client_release(w);
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}
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}
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static int web_server_rcv_callback(POLLINFO *pi, short int *events) {
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worker_private->receptions++;
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struct web_client *w = (struct web_client *)pi->data;
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int fd = pi->fd;
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if(unlikely(web_client_receive(w) < 0))
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return -1;
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debug(D_WEB_CLIENT, "%llu: processing received data on fd %d.", w->id, fd);
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web_client_process_request(w);
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if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY)) {
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if(w->pollinfo_filecopy_slot == 0) {
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debug(D_WEB_CLIENT, "%llu: FILECOPY DETECTED ON FD %d", w->id, pi->fd);
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if (unlikely(w->ifd != -1 && w->ifd != w->ofd && w->ifd != fd)) {
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// add a new socket to poll_events, with the same
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debug(D_WEB_CLIENT, "%llu: CREATING FILECOPY SLOT ON FD %d", w->id, pi->fd);
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POLLINFO *fpi = poll_add_fd(
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pi->p
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, w->ifd
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, pi->port_acl
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, 0
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, POLLINFO_FLAG_CLIENT_SOCKET
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, "FILENAME"
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, ""
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, web_server_file_add_callback
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, web_werver_file_del_callback
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, web_server_file_read_callback
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, web_server_file_write_callback
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, (void *) w
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);
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if(fpi)
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w->pollinfo_filecopy_slot = fpi->slot;
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else {
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error("Failed to add filecopy fd. Closing client.");
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return -1;
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}
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}
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}
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}
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else {
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if(unlikely(w->ifd == fd && web_client_has_wait_receive(w)))
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*events |= POLLIN;
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}
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if(unlikely(w->ofd == fd && web_client_has_wait_send(w)))
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*events |= POLLOUT;
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return web_server_check_client_status(w);
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}
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static int web_server_snd_callback(POLLINFO *pi, short int *events) {
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worker_private->sends++;
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struct web_client *w = (struct web_client *)pi->data;
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int fd = pi->fd;
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debug(D_WEB_CLIENT, "%llu: sending data on fd %d.", w->id, fd);
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if(unlikely(web_client_send(w) < 0))
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return -1;
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if(unlikely(w->ifd == fd && web_client_has_wait_receive(w)))
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*events |= POLLIN;
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if(unlikely(w->ofd == fd && web_client_has_wait_send(w)))
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*events |= POLLOUT;
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return web_server_check_client_status(w);
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}
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static void web_server_tmr_callback(void *timer_data) {
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worker_private = (struct web_server_static_threaded_worker *)timer_data;
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static __thread RRDSET *st = NULL;
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static __thread RRDDIM *rd_user = NULL, *rd_system = NULL;
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if(unlikely(!st)) {
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char id[100 + 1];
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char title[100 + 1];
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snprintfz(id, 100, "web_thread%d_cpu", worker_private->id + 1);
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snprintfz(title, 100, "NetData web server thread No %d CPU usage", worker_private->id + 1);
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st = rrdset_create_localhost(
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"netdata"
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, id
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, NULL
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, "web"
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, "netdata.web_cpu"
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, title
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, "milliseconds/s"
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, "web"
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, "stats"
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, 132000 + worker_private->id
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, default_rrd_update_every
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, RRDSET_TYPE_STACKED
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);
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rd_user = rrddim_add(st, "user", NULL, 1, 1000, RRD_ALGORITHM_INCREMENTAL);
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rd_system = rrddim_add(st, "system", NULL, 1, 1000, RRD_ALGORITHM_INCREMENTAL);
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}
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else
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rrdset_next(st);
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struct rusage rusage;
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getrusage(RUSAGE_THREAD, &rusage);
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rrddim_set_by_pointer(st, rd_user, rusage.ru_utime.tv_sec * 1000000ULL + rusage.ru_utime.tv_usec);
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rrddim_set_by_pointer(st, rd_system, rusage.ru_stime.tv_sec * 1000000ULL + rusage.ru_stime.tv_usec);
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rrdset_done(st);
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}
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// ----------------------------------------------------------------------------
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// web server worker thread
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static void socket_listen_main_static_threaded_worker_cleanup(void *ptr) {
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worker_private = (struct web_server_static_threaded_worker *)ptr;
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info("freeing local web clients cache...");
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web_client_cache_destroy();
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info("stopped after %zu connects, %zu disconnects (max concurrent %zu), %zu receptions and %zu sends",
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worker_private->connected,
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worker_private->disconnected,
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worker_private->max_concurrent,
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worker_private->receptions,
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worker_private->sends
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);
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worker_private->running = 0;
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}
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void *socket_listen_main_static_threaded_worker(void *ptr) {
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worker_private = (struct web_server_static_threaded_worker *)ptr;
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worker_private->running = 1;
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netdata_thread_cleanup_push(socket_listen_main_static_threaded_worker_cleanup, ptr);
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poll_events(&api_sockets
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, web_server_add_callback
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, web_server_del_callback
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, web_server_rcv_callback
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, web_server_snd_callback
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, web_server_tmr_callback
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, web_allow_connections_from
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, NULL
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, web_client_first_request_timeout
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, web_client_timeout
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, default_rrd_update_every * 1000 // timer_milliseconds
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, ptr // timer_data
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, worker_private->max_sockets
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);
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netdata_thread_cleanup_pop(1);
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return NULL;
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}
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// ----------------------------------------------------------------------------
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// web server main thread - also becomes a worker
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static void socket_listen_main_static_threaded_cleanup(void *ptr) {
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struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
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static_thread->enabled = NETDATA_MAIN_THREAD_EXITING;
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int i, found = 0;
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usec_t max = 2 * USEC_PER_SEC, step = 50000;
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// we start from 1, - 0 is self
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for(i = 1; i < static_threaded_workers_count; i++) {
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if(static_workers_private_data[i].running) {
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found++;
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info("stopping worker %d", i + 1);
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netdata_thread_cancel(static_workers_private_data[i].thread);
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}
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else
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info("found stopped worker %d", i + 1);
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}
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while(found && max > 0) {
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max -= step;
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info("Waiting %d static web threads to finish...", found);
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sleep_usec(step);
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found = 0;
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// we start from 1, - 0 is self
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for(i = 1; i < static_threaded_workers_count; i++) {
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if (static_workers_private_data[i].running)
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found++;
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}
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}
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if(found)
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error("%d static web threads are taking too long to finish. Giving up.", found);
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info("closing all web server sockets...");
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listen_sockets_close(&api_sockets);
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info("all static web threads stopped.");
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static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
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}
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void *socket_listen_main_static_threaded(void *ptr) {
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netdata_thread_cleanup_push(socket_listen_main_static_threaded_cleanup, ptr);
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web_server_mode = WEB_SERVER_MODE_STATIC_THREADED;
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if(!api_sockets.opened)
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fatal("LISTENER: no listen sockets available.");
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// 6 threads is the optimal value
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// since 6 are the parallel connections browsers will do
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// so, if the machine has more CPUs, avoid using resources unnecessarily
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int def_thread_count = (processors > 6)?6:processors;
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if (!strcmp(config_get(CONFIG_SECTION_WEB, "mode", ""),"single-threaded")) {
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info("Running web server with one thread, because mode is single-threaded");
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config_set(CONFIG_SECTION_WEB, "mode", "static-threaded");
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def_thread_count = 1;
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}
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static_threaded_workers_count = config_get_number(CONFIG_SECTION_WEB, "web server threads", def_thread_count);
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if(static_threaded_workers_count < 1) static_threaded_workers_count = 1;
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size_t max_sockets = (size_t)config_get_number(CONFIG_SECTION_WEB, "web server max sockets", (long long int)(rlimit_nofile.rlim_cur / 2));
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static_workers_private_data = callocz((size_t)static_threaded_workers_count, sizeof(struct web_server_static_threaded_worker));
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web_server_is_multithreaded = (static_threaded_workers_count > 1);
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int i;
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for(i = 1; i < static_threaded_workers_count; i++) {
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static_workers_private_data[i].id = i;
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static_workers_private_data[i].max_sockets = max_sockets / static_threaded_workers_count;
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char tag[50 + 1];
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snprintfz(tag, 50, "WEB_SERVER[static%d]", i+1);
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info("starting worker %d", i+1);
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netdata_thread_create(&static_workers_private_data[i].thread, tag, NETDATA_THREAD_OPTION_DEFAULT, socket_listen_main_static_threaded_worker, (void *)&static_workers_private_data[i]);
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}
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// and the main one
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static_workers_private_data[0].max_sockets = max_sockets / static_threaded_workers_count;
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socket_listen_main_static_threaded_worker((void *)&static_workers_private_data[0]);
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netdata_thread_cleanup_pop(1);
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return NULL;
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}
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