Merging upstream version 1.11.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 990 insertions, 0 deletions

diff --git a/web/server/multi/Makefile.am b/web/server/multi/Makefile.am
new file mode 100644
index 00000000..90cc9ca1
--- /dev/null
+++ b/web/server/multi/Makefile.am
@@ -0,0 +1,11 @@
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diff --git a/web/server/multi/Makefile.in b/web/server/multi/Makefile.in
new file mode 100644
index 00000000..61ef9455
--- /dev/null
+++ b/web/server/multi/Makefile.in
@@ -0,0 +1,647 @@
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+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
+	    ($(am__cd) $$subdir && \
+	      $(MAKE) $(AM_MAKEFLAGS) \
+	        top_distdir="$$new_top_distdir" \
+	        distdir="$$new_distdir" \
+		am__remove_distdir=: \
+		am__skip_length_check=: \
+		am__skip_mode_fix=: \
+	        distdir) \
+	      || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-recursive
+all-am: Makefile $(DATA)
+installdirs: installdirs-recursive
+installdirs-am:
+install: install-recursive
+install-exec: install-exec-recursive
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+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-recursive
+
+clean-am: clean-generic mostlyclean-am
+
+distclean: distclean-recursive
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-recursive
+
+install-html-am:
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+
+install-info-am:
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+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-generic
+
+pdf: pdf-recursive
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+ps: ps-recursive
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+ps-am:
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+uninstall-am:
+
+.MAKE: $(am__recursive_targets) install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am check \
+	check-am clean clean-generic cscopelist-am ctags ctags-am \
+	distclean distclean-generic distclean-tags distdir dvi dvi-am \
+	html html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-generic pdf \
+	pdf-am ps ps-am tags tags-am uninstall uninstall-am
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/web/server/multi/README.md b/web/server/multi/README.md
new file mode 100644
index 00000000..f51073e9
--- /dev/null
+++ b/web/server/multi/README.md
@@ -0,0 +1,8 @@
+# `multi-threaded` web server
+
+The `multi-threaded` web server spawns a thread for each connection it receives.
+
+Each thread uses non-blocking I/O so it can serve any number of web requests in parallel,
+though this is not supported by HTTP, so in practice each thread serves all the requests sequentially.
+
+Each thread respects the `keep-alive` HTTP header to serve multiple HTTP requests via the same connection. 
\ No newline at end of file
diff --git a/web/server/multi/multi-threaded.c b/web/server/multi/multi-threaded.c
new file mode 100644
index 00000000..37bdd38a
--- /dev/null
+++ b/web/server/multi/multi-threaded.c
@@ -0,0 +1,314 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#define WEB_SERVER_INTERNALS 1
+#include "multi-threaded.h"
+
+// --------------------------------------------------------------------------------------
+// the thread of a single client - for the MULTI-THREADED web server
+
+// 1. waits for input and output, using async I/O
+// 2. it processes HTTP requests
+// 3. it generates HTTP responses
+// 4. it copies data from input to output if mode is FILECOPY
+
+int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
+int web_client_first_request_timeout = DEFAULT_TIMEOUT_TO_RECEIVE_FIRST_WEB_REQUEST;
+long web_client_streaming_rate_t = 0L;
+
+static void multi_threaded_web_client_worker_main_cleanup(void *ptr) {
+    struct web_client *w = ptr;
+    WEB_CLIENT_IS_DEAD(w);
+    w->running = 0;
+}
+
+static void *multi_threaded_web_client_worker_main(void *ptr) {
+    netdata_thread_cleanup_push(multi_threaded_web_client_worker_main_cleanup, ptr);
+
+            struct web_client *w = ptr;
+            w->running = 1;
+
+            struct pollfd fds[2], *ifd, *ofd;
+            int retval, timeout_ms;
+            nfds_t fdmax = 0;
+
+            while(!netdata_exit) {
+                if(unlikely(web_client_check_dead(w))) {
+                    debug(D_WEB_CLIENT, "%llu: client is dead.", w->id);
+                    break;
+                }
+                else if(unlikely(!web_client_has_wait_receive(w) && !web_client_has_wait_send(w))) {
+                    debug(D_WEB_CLIENT, "%llu: client is not set for neither receiving nor sending data.", w->id);
+                    break;
+                }
+
+                if(unlikely(w->ifd < 0 || w->ofd < 0)) {
+                    error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd", w->id, w->ifd, w->ofd);
+                    break;
+                }
+
+                if(w->ifd == w->ofd) {
+                    fds[0].fd = w->ifd;
+                    fds[0].events = 0;
+                    fds[0].revents = 0;
+
+                    if(web_client_has_wait_receive(w)) fds[0].events |= POLLIN;
+                    if(web_client_has_wait_send(w))    fds[0].events |= POLLOUT;
+
+                    fds[1].fd = -1;
+                    fds[1].events = 0;
+                    fds[1].revents = 0;
+
+                    ifd = ofd = &fds[0];
+
+                    fdmax = 1;
+                }
+                else {
+                    fds[0].fd = w->ifd;
+                    fds[0].events = 0;
+                    fds[0].revents = 0;
+                    if(web_client_has_wait_receive(w)) fds[0].events |= POLLIN;
+                    ifd = &fds[0];
+
+                    fds[1].fd = w->ofd;
+                    fds[1].events = 0;
+                    fds[1].revents = 0;
+                    if(web_client_has_wait_send(w))    fds[1].events |= POLLOUT;
+                    ofd = &fds[1];
+
+                    fdmax = 2;
+                }
+
+                debug(D_WEB_CLIENT, "%llu: Waiting socket async I/O for %s %s", w->id, web_client_has_wait_receive(w)?"INPUT":"", web_client_has_wait_send(w)?"OUTPUT":"");
+                errno = 0;
+                timeout_ms = web_client_timeout * 1000;
+                retval = poll(fds, fdmax, timeout_ms);
+
+                if(unlikely(netdata_exit)) break;
+
+                if(unlikely(retval == -1)) {
+                    if(errno == EAGAIN || errno == EINTR) {
+                        debug(D_WEB_CLIENT, "%llu: EAGAIN received.", w->id);
+                        continue;
+                    }
+
+                    debug(D_WEB_CLIENT, "%llu: LISTENER: poll() failed (input fd = %d, output fd = %d). Closing client.", w->id, w->ifd, w->ofd);
+                    break;
+                }
+                else if(unlikely(!retval)) {
+                    debug(D_WEB_CLIENT, "%llu: Timeout while waiting socket async I/O for %s %s", w->id, web_client_has_wait_receive(w)?"INPUT":"", web_client_has_wait_send(w)?"OUTPUT":"");
+                    break;
+                }
+
+                if(unlikely(netdata_exit)) break;
+
+                int used = 0;
+                if(web_client_has_wait_send(w) && ofd->revents & POLLOUT) {
+                    used++;
+                    if(web_client_send(w) < 0) {
+                        debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
+                        break;
+                    }
+                }
+
+                if(unlikely(netdata_exit)) break;
+
+                if(web_client_has_wait_receive(w) && (ifd->revents & POLLIN || ifd->revents & POLLPRI)) {
+                    used++;
+                    if(web_client_receive(w) < 0) {
+                        debug(D_WEB_CLIENT, "%llu: Cannot receive data from client. Closing client.", w->id);
+                        break;
+                    }
+
+                    if(w->mode == WEB_CLIENT_MODE_NORMAL) {
+                        debug(D_WEB_CLIENT, "%llu: Attempting to process received data.", w->id);
+                        web_client_process_request(w);
+
+                        // if the sockets are closed, may have transferred this client
+                        // to plugins.d
+                        if(unlikely(w->mode == WEB_CLIENT_MODE_STREAM))
+                            break;
+                    }
+                }
+
+                if(unlikely(!used)) {
+                    debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on socket.", w->id);
+                    break;
+                }
+            }
+
+            if(w->mode != WEB_CLIENT_MODE_STREAM)
+                web_server_log_connection(w, "DISCONNECTED");
+
+            web_client_request_done(w);
+
+            debug(D_WEB_CLIENT, "%llu: done...", w->id);
+
+            // close the sockets/files now
+            // to free file descriptors
+            if(w->ifd == w->ofd) {
+                if(w->ifd != -1) close(w->ifd);
+            }
+            else {
+                if(w->ifd != -1) close(w->ifd);
+                if(w->ofd != -1) close(w->ofd);
+            }
+            w->ifd = -1;
+            w->ofd = -1;
+
+    netdata_thread_cleanup_pop(1);
+    return NULL;
+}
+
+// --------------------------------------------------------------------------------------
+// the main socket listener - MULTI-THREADED
+
+// 1. it accepts new incoming requests on our port
+// 2. creates a new web_client for each connection received
+// 3. spawns a new netdata_thread to serve the client (this is optimal for keep-alive clients)
+// 4. cleans up old web_clients that their netdata_threads have been exited
+
+static void web_client_multi_threaded_web_server_release_clients(void) {
+    struct web_client *w;
+    for(w = web_clients_cache.used; w ; ) {
+        if(unlikely(!w->running && web_client_check_dead(w))) {
+            struct web_client *t = w->next;
+            web_client_release(w);
+            w = t;
+        }
+        else
+            w = w->next;
+    }
+}
+
+static void web_client_multi_threaded_web_server_stop_all_threads(void) {
+    struct web_client *w;
+
+    int found = 1;
+    usec_t max = 2 * USEC_PER_SEC, step = 50000;
+    for(w = web_clients_cache.used; w ; w = w->next) {
+        if(w->running) {
+            found++;
+            info("stopping web client %s, id %llu", w->client_ip, w->id);
+            netdata_thread_cancel(w->thread);
+        }
+    }
+
+    while(found && max > 0) {
+        max -= step;
+        info("Waiting %d web threads to finish...", found);
+        sleep_usec(step);
+        found = 0;
+        for(w = web_clients_cache.used; w ; w = w->next)
+            if(w->running) found++;
+    }
+
+    if(found)
+        error("%d web threads are taking too long to finish. Giving up.", found);
+}
+
+static struct pollfd *socket_listen_main_multi_threaded_fds = NULL;
+
+static void socket_listen_main_multi_threaded_cleanup(void *data) {
+    struct netdata_static_thread *static_thread = (struct netdata_static_thread *)data;
+    static_thread->enabled = NETDATA_MAIN_THREAD_EXITING;
+
+    info("cleaning up...");
+
+    info("releasing allocated memory...");
+    freez(socket_listen_main_multi_threaded_fds);
+
+    info("closing all sockets...");
+    listen_sockets_close(&api_sockets);
+
+    info("stopping all running web server threads...");
+    web_client_multi_threaded_web_server_stop_all_threads();
+
+    info("freeing web clients cache...");
+    web_client_cache_destroy();
+
+    info("cleanup completed.");
+    static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
+}
+
+#define CLEANUP_EVERY_EVENTS 60
+void *socket_listen_main_multi_threaded(void *ptr) {
+    netdata_thread_cleanup_push(socket_listen_main_multi_threaded_cleanup, ptr);
+
+            web_server_mode = WEB_SERVER_MODE_MULTI_THREADED;
+            web_server_is_multithreaded = 1;
+
+            struct web_client *w;
+            int retval, counter = 0;
+
+            if(!api_sockets.opened)
+                fatal("LISTENER: No sockets to listen to.");
+
+            socket_listen_main_multi_threaded_fds = callocz(sizeof(struct pollfd), api_sockets.opened);
+
+            size_t i;
+            for(i = 0; i < api_sockets.opened ;i++) {
+                socket_listen_main_multi_threaded_fds[i].fd = api_sockets.fds[i];
+                socket_listen_main_multi_threaded_fds[i].events = POLLIN;
+                socket_listen_main_multi_threaded_fds[i].revents = 0;
+
+                info("Listening on '%s'", (api_sockets.fds_names[i])?api_sockets.fds_names[i]:"UNKNOWN");
+            }
+
+            int timeout_ms = 1 * 1000;
+
+            while(!netdata_exit) {
+
+                // debug(D_WEB_CLIENT, "LISTENER: Waiting...");
+                retval = poll(socket_listen_main_multi_threaded_fds, api_sockets.opened, timeout_ms);
+
+                if(unlikely(retval == -1)) {
+                    error("LISTENER: poll() failed.");
+                    continue;
+                }
+                else if(unlikely(!retval)) {
+                    debug(D_WEB_CLIENT, "LISTENER: poll() timeout.");
+                    counter++;
+                    continue;
+                }
+
+                for(i = 0 ; i < api_sockets.opened ; i++) {
+                    short int revents = socket_listen_main_multi_threaded_fds[i].revents;
+
+                    // check for new incoming connections
+                    if(revents & POLLIN || revents & POLLPRI) {
+                        socket_listen_main_multi_threaded_fds[i].revents = 0;
+
+                        w = web_client_create_on_listenfd(socket_listen_main_multi_threaded_fds[i].fd);
+                        if(unlikely(!w)) {
+                            // no need for error log - web_client_create_on_listenfd already logged the error
+                            continue;
+                        }
+
+                        if(api_sockets.fds_families[i] == AF_UNIX)
+                            web_client_set_unix(w);
+                        else
+                            web_client_set_tcp(w);
+
+                        char tag[NETDATA_THREAD_TAG_MAX + 1];
+                        snprintfz(tag, NETDATA_THREAD_TAG_MAX, "WEB_CLIENT[%llu,[%s]:%s]", w->id, w->client_ip, w->client_port);
+
+                        w->running = 1;
+                        if(netdata_thread_create(&w->thread, tag, NETDATA_THREAD_OPTION_DONT_LOG, multi_threaded_web_client_worker_main, w) != 0) {
+                            w->running = 0;
+                            web_client_release(w);
+                        }
+                    }
+                }
+
+                counter++;
+                if(counter > CLEANUP_EVERY_EVENTS) {
+                    counter = 0;
+                    web_client_multi_threaded_web_server_release_clients();
+                }
+            }
+
+    netdata_thread_cleanup_pop(1);
+    return NULL;
+}
+
+
diff --git a/web/server/multi/multi-threaded.h b/web/server/multi/multi-threaded.h
new file mode 100644
index 00000000..d7ebf3c5
--- /dev/null
+++ b/web/server/multi/multi-threaded.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_WEB_SERVER_MULTI_THREADED_H
+#define NETDATA_WEB_SERVER_MULTI_THREADED_H
+
+#include "web/server/web_server.h"
+
+extern void *socket_listen_main_multi_threaded(void *ptr);
+
+#endif //NETDATA_WEB_SERVER_MULTI_THREADED_H