X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-relayd%2Flive.c;h=13078026b220b7e3f9e6c3e1c8a0e3009e3e7766;hp=beb67b2a5654ed54cc5ef36a75408c2d6b667364;hb=HEAD;hpb=178a055717baca3641cecbb45fe3c0d5d3286a3a diff --git a/src/bin/lttng-relayd/live.c b/src/bin/lttng-relayd/live.c deleted file mode 100644 index beb67b2a5..000000000 --- a/src/bin/lttng-relayd/live.c +++ /dev/null @@ -1,2196 +0,0 @@ -/* - * Copyright (C) 2013 - Julien Desfossez - * David Goulet - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License, version 2 only, - * as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#define _GNU_SOURCE -#define _LGPL_SOURCE -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "cmd.h" -#include "live.h" -#include "lttng-relayd.h" -#include "utils.h" -#include "health-relayd.h" -#include "testpoint.h" -#include "viewer-stream.h" -#include "stream.h" -#include "session.h" -#include "ctf-trace.h" -#include "connection.h" - -static struct lttng_uri *live_uri; - -/* - * This pipe is used to inform the worker thread that a command is queued and - * ready to be processed. - */ -static int live_conn_pipe[2] = { -1, -1 }; - -/* Shared between threads */ -static int live_dispatch_thread_exit; - -static pthread_t live_listener_thread; -static pthread_t live_dispatcher_thread; -static pthread_t live_worker_thread; - -/* - * Relay command queue. - * - * The live_thread_listener and live_thread_dispatcher communicate with this - * queue. - */ -static struct relay_conn_queue viewer_conn_queue; - -static uint64_t last_relay_viewer_session_id; - -/* - * Cleanup the daemon - */ -static -void cleanup_relayd_live(void) -{ - DBG("Cleaning up"); - - free(live_uri); -} - -/* - * Receive a request buffer using a given socket, destination allocated buffer - * of length size. - * - * Return the size of the received message or else a negative value on error - * with errno being set by recvmsg() syscall. - */ -static -ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size) -{ - ssize_t ret; - - assert(sock); - assert(buf); - - ret = sock->ops->recvmsg(sock, buf, size, 0); - if (ret < 0 || ret != size) { - if (ret == 0) { - /* Orderly shutdown. Not necessary to print an error. */ - DBG("Socket %d did an orderly shutdown", sock->fd); - } else { - ERR("Relay failed to receive request."); - } - ret = -1; - } - - return ret; -} - -/* - * Send a response buffer using a given socket, source allocated buffer of - * length size. - * - * Return the size of the sent message or else a negative value on error with - * errno being set by sendmsg() syscall. - */ -static -ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size) -{ - ssize_t ret; - - assert(sock); - assert(buf); - - ret = sock->ops->sendmsg(sock, buf, size, 0); - if (ret < 0) { - ERR("Relayd failed to send response."); - } - - return ret; -} - -/* - * Atomically check if new streams got added in one of the sessions attached - * and reset the flag to 0. - * - * Returns 1 if new streams got added, 0 if nothing changed, a negative value - * on error. - */ -static -int check_new_streams(struct relay_connection *conn) -{ - struct relay_session *session; - unsigned long current_val; - int ret = 0; - - if (!conn->viewer_session) { - goto end; - } - cds_list_for_each_entry(session, - &conn->viewer_session->sessions_head, - viewer_session_list) { - current_val = uatomic_cmpxchg(&session->new_streams, 1, 0); - ret = current_val; - if (ret == 1) { - goto end; - } - } - -end: - return ret; -} - -/* - * Send viewer streams to the given socket. The ignore_sent_flag indicates if - * this function should ignore the sent flag or not. - * - * Return 0 on success or else a negative value. - */ -static -ssize_t send_viewer_streams(struct lttcomm_sock *sock, - struct relay_session *session, unsigned int ignore_sent_flag) -{ - ssize_t ret; - struct lttng_viewer_stream send_stream; - struct lttng_ht_iter iter; - struct relay_viewer_stream *vstream; - - assert(session); - - rcu_read_lock(); - - cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, - stream_n.node) { - struct ctf_trace *ctf_trace; - - health_code_update(); - - /* Ignore if not the same session. */ - if (vstream->session_id != session->id || - (!ignore_sent_flag && vstream->sent_flag)) { - continue; - } - - ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, - vstream->path_name); - assert(ctf_trace); - - send_stream.id = htobe64(vstream->stream_handle); - send_stream.ctf_trace_id = htobe64(ctf_trace->id); - send_stream.metadata_flag = htobe32(vstream->metadata_flag); - strncpy(send_stream.path_name, vstream->path_name, - sizeof(send_stream.path_name)); - strncpy(send_stream.channel_name, vstream->channel_name, - sizeof(send_stream.channel_name)); - - DBG("Sending stream %" PRIu64 " to viewer", vstream->stream_handle); - ret = send_response(sock, &send_stream, sizeof(send_stream)); - if (ret < 0) { - goto end_unlock; - } - vstream->sent_flag = 1; - } - - ret = 0; - -end_unlock: - rcu_read_unlock(); - return ret; -} - -/* - * Create every viewer stream possible for the given session with the seek - * type. Three counters *can* be return which are in order the total amount of - * viewer stream of the session, the number of unsent stream and the number of - * stream created. Those counters can be NULL and thus will be ignored. - * - * Return 0 on success or else a negative value. - */ -static -int make_viewer_streams(struct relay_session *session, - enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent, - uint32_t *nb_created) -{ - int ret; - struct lttng_ht_iter iter; - struct ctf_trace *ctf_trace; - - assert(session); - - /* - * This is to make sure we create viewer streams for a full received - * channel. For instance, if we have 8 streams for a channel that are - * concurrently being flagged ready, we can end up creating just a subset - * of the 8 streams (the ones that are flagged). This lock avoids this - * limbo state. - */ - pthread_mutex_lock(&session->viewer_ready_lock); - - /* - * Create viewer streams for relay streams that are ready to be used for a - * the given session id only. - */ - rcu_read_lock(); - cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, - node.node) { - struct relay_stream *stream; - - health_code_update(); - - if (ctf_trace->invalid_flag) { - continue; - } - - cds_list_for_each_entry(stream, &ctf_trace->stream_list, trace_list) { - struct relay_viewer_stream *vstream; - - if (!stream->viewer_ready) { - continue; - } - - vstream = viewer_stream_find_by_id(stream->stream_handle); - if (!vstream) { - vstream = viewer_stream_create(stream, seek_t, ctf_trace); - if (!vstream) { - ret = -1; - goto error_unlock; - } - /* Acquire reference to ctf_trace. */ - ctf_trace_get_ref(ctf_trace); - - if (nb_created) { - /* Update number of created stream counter. */ - (*nb_created)++; - } - } else if (!vstream->sent_flag && nb_unsent) { - /* Update number of unsent stream counter. */ - (*nb_unsent)++; - } - /* Update number of total stream counter. */ - if (nb_total) { - (*nb_total)++; - } - } - } - - ret = 0; - -error_unlock: - rcu_read_unlock(); - pthread_mutex_unlock(&session->viewer_ready_lock); - return ret; -} - -/* - * Write to writable pipe used to notify a thread. - */ -static -int notify_thread_pipe(int wpipe) -{ - ssize_t ret; - - ret = lttng_write(wpipe, "!", 1); - if (ret < 1) { - PERROR("write poll pipe"); - } - - return (int) ret; -} - -/* - * Stop all threads by closing the thread quit pipe. - */ -static -int stop_threads(void) -{ - int ret, retval = 0; - - /* Stopping all threads */ - DBG("Terminating all live threads"); - ret = notify_thread_pipe(thread_quit_pipe[1]); - if (ret < 0) { - ERR("write error on thread quit pipe"); - retval = -1; - } - - /* Dispatch thread */ - CMM_STORE_SHARED(live_dispatch_thread_exit, 1); - futex_nto1_wake(&viewer_conn_queue.futex); - return retval; -} - -/* - * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. - */ -static -int create_thread_poll_set(struct lttng_poll_event *events, int size) -{ - int ret; - - if (events == NULL || size == 0) { - ret = -1; - goto error; - } - - ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); - if (ret < 0) { - goto error; - } - - /* Add quit pipe */ - ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); - if (ret < 0) { - goto error; - } - - return 0; - -error: - return ret; -} - -/* - * Check if the thread quit pipe was triggered. - * - * Return 1 if it was triggered else 0; - */ -static -int check_thread_quit_pipe(int fd, uint32_t events) -{ - if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { - return 1; - } - - return 0; -} - -/* - * Create and init socket from uri. - */ -static -struct lttcomm_sock *init_socket(struct lttng_uri *uri) -{ - int ret; - struct lttcomm_sock *sock = NULL; - - sock = lttcomm_alloc_sock_from_uri(uri); - if (sock == NULL) { - ERR("Allocating socket"); - goto error; - } - - ret = lttcomm_create_sock(sock); - if (ret < 0) { - goto error; - } - DBG("Listening on sock %d for live", sock->fd); - - ret = sock->ops->bind(sock); - if (ret < 0) { - goto error; - } - - ret = sock->ops->listen(sock, -1); - if (ret < 0) { - goto error; - - } - - return sock; - -error: - if (sock) { - lttcomm_destroy_sock(sock); - } - return NULL; -} - -/* - * This thread manages the listening for new connections on the network - */ -static -void *thread_listener(void *data) -{ - int i, ret, pollfd, err = -1; - uint32_t revents, nb_fd; - struct lttng_poll_event events; - struct lttcomm_sock *live_control_sock; - - DBG("[thread] Relay live listener started"); - - health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); - - health_code_update(); - - live_control_sock = init_socket(live_uri); - if (!live_control_sock) { - goto error_sock_control; - } - - /* Pass 2 as size here for the thread quit pipe and control sockets. */ - ret = create_thread_poll_set(&events, 2); - if (ret < 0) { - goto error_create_poll; - } - - /* Add the control socket */ - ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); - if (ret < 0) { - goto error_poll_add; - } - - lttng_relay_notify_ready(); - - if (testpoint(relayd_thread_live_listener)) { - goto error_testpoint; - } - - while (1) { - health_code_update(); - - DBG("Listener accepting live viewers connections"); - -restart: - health_poll_entry(); - ret = lttng_poll_wait(&events, -1); - health_poll_exit(); - if (ret < 0) { - /* - * Restart interrupted system call. - */ - if (errno == EINTR) { - goto restart; - } - goto error; - } - nb_fd = ret; - - DBG("Relay new viewer connection received"); - for (i = 0; i < nb_fd; i++) { - health_code_update(); - - /* Fetch once the poll data */ - revents = LTTNG_POLL_GETEV(&events, i); - pollfd = LTTNG_POLL_GETFD(&events, i); - - /* Thread quit pipe has been closed. Killing thread. */ - ret = check_thread_quit_pipe(pollfd, revents); - if (ret) { - err = 0; - goto exit; - } - - if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { - ERR("socket poll error"); - goto error; - } else if (revents & LPOLLIN) { - /* - * Get allocated in this thread, enqueued to a global queue, - * dequeued and freed in the worker thread. - */ - int val = 1; - struct relay_connection *new_conn; - struct lttcomm_sock *newsock; - - new_conn = connection_create(); - if (!new_conn) { - goto error; - } - - newsock = live_control_sock->ops->accept(live_control_sock); - if (!newsock) { - PERROR("accepting control sock"); - connection_free(new_conn); - goto error; - } - DBG("Relay viewer connection accepted socket %d", newsock->fd); - - ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, - sizeof(val)); - if (ret < 0) { - PERROR("setsockopt inet"); - lttcomm_destroy_sock(newsock); - connection_free(new_conn); - goto error; - } - new_conn->sock = newsock; - - /* Enqueue request for the dispatcher thread. */ - cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail, - &new_conn->qnode); - - /* - * Wake the dispatch queue futex. Implicit memory barrier with - * the exchange in cds_wfcq_enqueue. - */ - futex_nto1_wake(&viewer_conn_queue.futex); - } - } - } - -exit: -error: -error_poll_add: -error_testpoint: - lttng_poll_clean(&events); -error_create_poll: - if (live_control_sock->fd >= 0) { - ret = live_control_sock->ops->close(live_control_sock); - if (ret) { - PERROR("close"); - } - } - lttcomm_destroy_sock(live_control_sock); -error_sock_control: - if (err) { - health_error(); - DBG("Live viewer listener thread exited with error"); - } - health_unregister(health_relayd); - DBG("Live viewer listener thread cleanup complete"); - if (stop_threads()) { - ERR("Error stopping live threads"); - } - return NULL; -} - -/* - * This thread manages the dispatching of the requests to worker threads - */ -static -void *thread_dispatcher(void *data) -{ - int err = -1; - ssize_t ret; - struct cds_wfcq_node *node; - struct relay_connection *conn = NULL; - - DBG("[thread] Live viewer relay dispatcher started"); - - health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); - - if (testpoint(relayd_thread_live_dispatcher)) { - goto error_testpoint; - } - - health_code_update(); - - while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { - health_code_update(); - - /* Atomically prepare the queue futex */ - futex_nto1_prepare(&viewer_conn_queue.futex); - - do { - health_code_update(); - - /* Dequeue commands */ - node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, - &viewer_conn_queue.tail); - if (node == NULL) { - DBG("Woken up but nothing in the live-viewer " - "relay command queue"); - /* Continue thread execution */ - break; - } - conn = caa_container_of(node, struct relay_connection, qnode); - DBG("Dispatching viewer request waiting on sock %d", - conn->sock->fd); - - /* - * Inform worker thread of the new request. This call is blocking - * so we can be assured that the data will be read at some point in - * time or wait to the end of the world :) - */ - ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); - if (ret < 0) { - PERROR("write conn pipe"); - connection_destroy(conn); - goto error; - } - } while (node != NULL); - - /* Futex wait on queue. Blocking call on futex() */ - health_poll_entry(); - futex_nto1_wait(&viewer_conn_queue.futex); - health_poll_exit(); - } - - /* Normal exit, no error */ - err = 0; - -error: -error_testpoint: - if (err) { - health_error(); - ERR("Health error occurred in %s", __func__); - } - health_unregister(health_relayd); - DBG("Live viewer dispatch thread dying"); - if (stop_threads()) { - ERR("Error stopping live threads"); - } - return NULL; -} - -/* - * Establish connection with the viewer and check the versions. - * - * Return 0 on success or else negative value. - */ -static -int viewer_connect(struct relay_connection *conn) -{ - int ret; - struct lttng_viewer_connect reply, msg; - - assert(conn); - - conn->version_check_done = 1; - - health_code_update(); - - DBG("Viewer is establishing a connection to the relayd."); - - ret = recv_request(conn->sock, &msg, sizeof(msg)); - if (ret < 0) { - goto end; - } - - health_code_update(); - - memset(&reply, 0, sizeof(reply)); - reply.major = RELAYD_VERSION_COMM_MAJOR; - reply.minor = RELAYD_VERSION_COMM_MINOR; - - /* Major versions must be the same */ - if (reply.major != be32toh(msg.major)) { - DBG("Incompatible major versions ([relayd] %u vs [client] %u)", - reply.major, be32toh(msg.major)); - ret = -1; - goto end; - } - - conn->major = reply.major; - /* We adapt to the lowest compatible version */ - if (reply.minor <= be32toh(msg.minor)) { - conn->minor = reply.minor; - } else { - conn->minor = be32toh(msg.minor); - } - - if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { - conn->type = RELAY_VIEWER_COMMAND; - } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { - conn->type = RELAY_VIEWER_NOTIFICATION; - } else { - ERR("Unknown connection type : %u", be32toh(msg.type)); - ret = -1; - goto end; - } - - reply.major = htobe32(reply.major); - reply.minor = htobe32(reply.minor); - if (conn->type == RELAY_VIEWER_COMMAND) { - reply.viewer_session_id = htobe64(++last_relay_viewer_session_id); - } - - health_code_update(); - - ret = send_response(conn->sock, &reply, sizeof(reply)); - if (ret < 0) { - goto end; - } - - health_code_update(); - - DBG("Version check done using protocol %u.%u", conn->major, conn->minor); - ret = 0; - -end: - return ret; -} - -/* - * Send the viewer the list of current sessions. - * - * Return 0 on success or else a negative value. - */ -static -int viewer_list_sessions(struct relay_connection *conn) -{ - int ret; - struct lttng_viewer_list_sessions session_list; - unsigned long count; - long approx_before, approx_after; - struct lttng_ht_iter iter; - struct lttng_viewer_session send_session; - struct relay_session *session; - - DBG("List sessions received"); - - rcu_read_lock(); - cds_lfht_count_nodes(conn->sessions_ht->ht, &approx_before, &count, - &approx_after); - session_list.sessions_count = htobe32(count); - - health_code_update(); - - ret = send_response(conn->sock, &session_list, sizeof(session_list)); - if (ret < 0) { - goto end_unlock; - } - - health_code_update(); - - cds_lfht_for_each_entry(conn->sessions_ht->ht, &iter.iter, session, - session_n.node) { - health_code_update(); - - strncpy(send_session.session_name, session->session_name, - sizeof(send_session.session_name)); - strncpy(send_session.hostname, session->hostname, - sizeof(send_session.hostname)); - send_session.id = htobe64(session->id); - send_session.live_timer = htobe32(session->live_timer); - send_session.clients = htobe32(session->viewer_refcount); - send_session.streams = htobe32(session->stream_count); - - health_code_update(); - - ret = send_response(conn->sock, &send_session, sizeof(send_session)); - if (ret < 0) { - goto end_unlock; - } - } - health_code_update(); - - ret = 0; -end_unlock: - rcu_read_unlock(); - return ret; -} - -/* - * Check if a connection is attached to a session. - * Return 1 if attached, 0 if not attached, a negative value on error. - */ -static -int session_attached(struct relay_connection *conn, uint64_t session_id) -{ - struct relay_session *session; - int found = 0; - - if (!conn->viewer_session) { - goto end; - } - cds_list_for_each_entry(session, - &conn->viewer_session->sessions_head, - viewer_session_list) { - if (session->id == session_id) { - found = 1; - goto end; - } - } - -end: - return found; -} - -/* - * Delete all streams for a specific session ID. - */ -static void destroy_viewer_streams_by_session(struct relay_session *session) -{ - struct relay_viewer_stream *stream; - struct lttng_ht_iter iter; - - assert(session); - - rcu_read_lock(); - cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, stream, - stream_n.node) { - struct ctf_trace *ctf_trace; - - health_code_update(); - if (stream->session_id != session->id) { - continue; - } - - ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, - stream->path_name); - assert(ctf_trace); - - viewer_stream_delete(stream); - - if (stream->metadata_flag) { - ctf_trace->metadata_sent = 0; - ctf_trace->viewer_metadata_stream = NULL; - } - - viewer_stream_destroy(ctf_trace, stream); - } - rcu_read_unlock(); -} - -static void try_destroy_streams(struct relay_session *session) -{ - struct ctf_trace *ctf_trace; - struct lttng_ht_iter iter; - - assert(session); - - cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, - node.node) { - /* Attempt to destroy the ctf trace of that session. */ - ctf_trace_try_destroy(session, ctf_trace); - } -} - -/* - * Cleanup a session. - */ -static void cleanup_session(struct relay_connection *conn, - struct relay_session *session) -{ - /* - * Very important that this is done before destroying the session so we - * can put back every viewer stream reference from the ctf_trace. - */ - destroy_viewer_streams_by_session(session); - try_destroy_streams(session); - cds_list_del(&session->viewer_session_list); - session_viewer_try_destroy(conn->sessions_ht, session); -} - -/* - * Send the viewer the list of current sessions. - */ -static -int viewer_get_new_streams(struct relay_connection *conn) -{ - int ret, send_streams = 0; - uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0; - struct lttng_viewer_new_streams_request request; - struct lttng_viewer_new_streams_response response; - struct relay_session *session; - uint64_t session_id; - - assert(conn); - - DBG("Get new streams received"); - - health_code_update(); - - /* Receive the request from the connected client. */ - ret = recv_request(conn->sock, &request, sizeof(request)); - if (ret < 0) { - goto error; - } - session_id = be64toh(request.session_id); - - health_code_update(); - - memset(&response, 0, sizeof(response)); - - rcu_read_lock(); - session = session_find_by_id(conn->sessions_ht, session_id); - if (!session) { - DBG("Relay session %" PRIu64 " not found", session_id); - response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); - goto send_reply; - } - - if (!session_attached(conn, session_id)) { - send_streams = 0; - response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); - goto send_reply; - } - - send_streams = 1; - response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); - - ret = make_viewer_streams(session, LTTNG_VIEWER_SEEK_LAST, NULL, &nb_unsent, - &nb_created); - if (ret < 0) { - goto end_unlock; - } - /* Only send back the newly created streams with the unsent ones. */ - nb_streams = nb_created + nb_unsent; - response.streams_count = htobe32(nb_streams); - - /* - * If the session is closed and we have no new streams to send, - * it means that the viewer has already received the whole trace - * for this session and should now close it. - */ - if (nb_streams == 0 && session->close_flag) { - send_streams = 0; - response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); - /* - * Remove the session from the attached list of the connection - * and try to destroy it. - */ - cds_list_del(&session->viewer_session_list); - cleanup_session(conn, session); - goto send_reply; - } - -send_reply: - health_code_update(); - ret = send_response(conn->sock, &response, sizeof(response)); - if (ret < 0) { - goto end_unlock; - } - health_code_update(); - - /* - * Unknown or empty session, just return gracefully, the viewer knows what - * is happening. - */ - if (!send_streams || !nb_streams) { - ret = 0; - goto end_unlock; - } - - /* - * Send stream and *DON'T* ignore the sent flag so every viewer streams - * that were not sent from that point will be sent to the viewer. - */ - ret = send_viewer_streams(conn->sock, session, 0); - if (ret < 0) { - goto end_unlock; - } - -end_unlock: - rcu_read_unlock(); -error: - return ret; -} - -/* - * Send the viewer the list of current sessions. - */ -static -int viewer_attach_session(struct relay_connection *conn) -{ - int send_streams = 0; - ssize_t ret; - uint32_t nb_streams = 0; - enum lttng_viewer_seek seek_type; - struct lttng_viewer_attach_session_request request; - struct lttng_viewer_attach_session_response response; - struct relay_session *session; - - assert(conn); - - health_code_update(); - - /* Receive the request from the connected client. */ - ret = recv_request(conn->sock, &request, sizeof(request)); - if (ret < 0) { - goto error; - } - - health_code_update(); - - memset(&response, 0, sizeof(response)); - - if (!conn->viewer_session) { - DBG("Client trying to attach before creating a live viewer session"); - response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); - goto send_reply; - } - - rcu_read_lock(); - session = session_find_by_id(conn->sessions_ht, - be64toh(request.session_id)); - if (!session) { - DBG("Relay session %" PRIu64 " not found", - be64toh(request.session_id)); - response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); - goto send_reply; - } - session_viewer_attach(session); - DBG("Attach session ID %" PRIu64 " received", be64toh(request.session_id)); - - if (uatomic_read(&session->viewer_refcount) > 1) { - DBG("Already a viewer attached"); - response.status = htobe32(LTTNG_VIEWER_ATTACH_ALREADY); - session_viewer_detach(session); - goto send_reply; - } else if (session->live_timer == 0) { - DBG("Not live session"); - response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); - goto send_reply; - } else { - send_streams = 1; - response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); - cds_list_add(&session->viewer_session_list, - &conn->viewer_session->sessions_head); - } - - switch (be32toh(request.seek)) { - case LTTNG_VIEWER_SEEK_BEGINNING: - case LTTNG_VIEWER_SEEK_LAST: - seek_type = be32toh(request.seek); - break; - default: - ERR("Wrong seek parameter"); - response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); - send_streams = 0; - goto send_reply; - } - - ret = make_viewer_streams(session, seek_type, &nb_streams, NULL, NULL); - if (ret < 0) { - goto end_unlock; - } - response.streams_count = htobe32(nb_streams); - -send_reply: - health_code_update(); - ret = send_response(conn->sock, &response, sizeof(response)); - if (ret < 0) { - goto end_unlock; - } - health_code_update(); - - /* - * Unknown or empty session, just return gracefully, the viewer knows what - * is happening. - */ - if (!send_streams || !nb_streams) { - ret = 0; - goto end_unlock; - } - - /* Send stream and ignore the sent flag. */ - ret = send_viewer_streams(conn->sock, session, 1); - if (ret < 0) { - goto end_unlock; - } - -end_unlock: - rcu_read_unlock(); -error: - return ret; -} - -/* - * Open the index file if needed for the given vstream. - * - * If an index file is successfully opened, the index_read_fd of the stream is - * set with it. - * - * Return 0 on success, a negative value on error (-ENOENT if not ready yet). - */ -static int try_open_index(struct relay_viewer_stream *vstream, - struct relay_stream *rstream) -{ - int ret = 0; - - assert(vstream); - assert(rstream); - - if (vstream->index_read_fd >= 0) { - goto end; - } - - /* - * First time, we open the index file and at least one index is ready. The - * race between the read and write of the total_index_received is - * acceptable here since the client will be notified to simply come back - * and get the next index. - */ - if (rstream->total_index_received <= 0) { - ret = -ENOENT; - goto end; - } - ret = index_open(vstream->path_name, vstream->channel_name, - vstream->tracefile_count, vstream->tracefile_count_current); - if (ret >= 0) { - vstream->index_read_fd = ret; - ret = 0; - goto end; - } - -end: - return ret; -} - -/* - * Check the status of the index for the given stream. This function updates - * the index structure if needed and can destroy the vstream also for the HUP - * situation. - * - * Return 0 means that we can proceed with the index. A value of 1 means that - * the index has been updated and is ready to be send to the client. A negative - * value indicates an error that can't be handled. - */ -static int check_index_status(struct relay_viewer_stream *vstream, - struct relay_stream *rstream, struct ctf_trace *trace, - struct lttng_viewer_index *index) -{ - int ret; - - assert(vstream); - assert(rstream); - assert(index); - assert(trace); - - if (!rstream->close_flag) { - /* Rotate on abort (overwrite). */ - if (vstream->abort_flag) { - DBG("Viewer stream %" PRIu64 " rotate because of overwrite", - vstream->stream_handle); - ret = viewer_stream_rotate(vstream, rstream); - if (ret < 0) { - goto error; - } else if (ret == 1) { - /* EOF */ - index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); - goto hup; - } - /* ret == 0 means successful so we continue. */ - } - - /* Check if we are in the same trace file at this point. */ - if (rstream->tracefile_count_current == vstream->tracefile_count_current) { - if (rstream->beacon_ts_end != -1ULL && - vstream->last_sent_index == rstream->total_index_received) { - /* - * We've received a synchronization beacon and the last index - * available has been sent, the index for now is inactive. - */ - index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); - index->timestamp_end = htobe64(rstream->beacon_ts_end); - index->stream_id = htobe64(rstream->ctf_stream_id); - goto index_ready; - } else if (rstream->total_index_received <= vstream->last_sent_index - && !vstream->close_write_flag) { - /* - * Reader and writer are working in the same tracefile, so we care - * about the number of index received and sent. Otherwise, we read - * up to EOF. - */ - index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); - goto index_ready; - } - } - /* Nothing to do with the index, continue with it. */ - ret = 0; - } else if (rstream->close_flag && vstream->close_write_flag && - vstream->total_index_received == vstream->last_sent_index) { - /* Last index sent and current tracefile closed in write */ - index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); - goto hup; - } else { - vstream->close_write_flag = 1; - ret = 0; - } - -error: - return ret; - -hup: - viewer_stream_delete(vstream); - viewer_stream_destroy(trace, vstream); -index_ready: - return 1; -} - -/* - * Send the next index for a stream. - * - * Return 0 on success or else a negative value. - */ -static -int viewer_get_next_index(struct relay_connection *conn) -{ - int ret; - ssize_t read_ret; - struct lttng_viewer_get_next_index request_index; - struct lttng_viewer_index viewer_index; - struct ctf_packet_index packet_index; - struct relay_viewer_stream *vstream; - struct relay_stream *rstream; - struct ctf_trace *ctf_trace; - struct relay_session *session; - - assert(conn); - - DBG("Viewer get next index"); - - health_code_update(); - - ret = recv_request(conn->sock, &request_index, sizeof(request_index)); - if (ret < 0) { - goto end; - } - health_code_update(); - - rcu_read_lock(); - vstream = viewer_stream_find_by_id(be64toh(request_index.stream_id)); - if (!vstream) { - ret = -1; - goto end_unlock; - } - - session = session_find_by_id(conn->sessions_ht, vstream->session_id); - if (!session) { - ret = -1; - goto end_unlock; - } - - ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, vstream->path_name); - assert(ctf_trace); - - memset(&viewer_index, 0, sizeof(viewer_index)); - - /* - * The viewer should not ask for index on metadata stream. - */ - if (vstream->metadata_flag) { - viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); - goto send_reply; - } - - rstream = stream_find_by_id(relay_streams_ht, vstream->stream_handle); - assert(rstream); - - /* Try to open an index if one is needed for that stream. */ - ret = try_open_index(vstream, rstream); - if (ret < 0) { - if (ret == -ENOENT) { - /* - * The index is created only when the first data packet arrives, it - * might not be ready at the beginning of the session - */ - viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); - } else { - /* Unhandled error. */ - viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); - } - goto send_reply; - } - - pthread_mutex_lock(&rstream->viewer_stream_rotation_lock); - ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); - pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); - if (ret < 0) { - goto end_unlock; - } else if (ret == 1) { - /* - * This means the viewer index data structure has been populated by the - * check call thus we now send back the reply to the client. - */ - goto send_reply; - } - /* At this point, ret MUST be 0 thus we continue with the get. */ - assert(!ret); - - if (!ctf_trace->metadata_received || - ctf_trace->metadata_received > ctf_trace->metadata_sent) { - viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; - } - - ret = check_new_streams(conn); - if (ret < 0) { - goto end_unlock; - } else if (ret == 1) { - viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; - } - - pthread_mutex_lock(&rstream->viewer_stream_rotation_lock); - pthread_mutex_lock(&vstream->overwrite_lock); - if (vstream->abort_flag) { - /* The file is being overwritten by the writer, we cannot use it. */ - pthread_mutex_unlock(&vstream->overwrite_lock); - ret = viewer_stream_rotate(vstream, rstream); - pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); - if (ret < 0) { - goto end_unlock; - } else if (ret == 1) { - viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); - viewer_stream_delete(vstream); - viewer_stream_destroy(ctf_trace, vstream); - } else { - viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); - } - goto send_reply; - } - - read_ret = lttng_read(vstream->index_read_fd, &packet_index, - sizeof(packet_index)); - pthread_mutex_unlock(&vstream->overwrite_lock); - pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); - if (read_ret < 0) { - viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); - viewer_stream_delete(vstream); - viewer_stream_destroy(ctf_trace, vstream); - goto send_reply; - } else if (read_ret < sizeof(packet_index)) { - pthread_mutex_lock(&rstream->viewer_stream_rotation_lock); - if (vstream->close_write_flag) { - ret = viewer_stream_rotate(vstream, rstream); - if (ret < 0) { - pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); - goto end_unlock; - } else if (ret == 1) { - viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); - viewer_stream_delete(vstream); - viewer_stream_destroy(ctf_trace, vstream); - } else { - viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); - } - } else { - ERR("Relay reading index file %d", vstream->index_read_fd); - viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); - } - pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); - goto send_reply; - } else { - viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); - vstream->last_sent_index++; - } - - /* - * Indexes are stored in big endian, no need to switch before sending. - */ - viewer_index.offset = packet_index.offset; - viewer_index.packet_size = packet_index.packet_size; - viewer_index.content_size = packet_index.content_size; - viewer_index.timestamp_begin = packet_index.timestamp_begin; - viewer_index.timestamp_end = packet_index.timestamp_end; - viewer_index.events_discarded = packet_index.events_discarded; - viewer_index.stream_id = packet_index.stream_id; - -send_reply: - viewer_index.flags = htobe32(viewer_index.flags); - health_code_update(); - - ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); - if (ret < 0) { - goto end_unlock; - } - health_code_update(); - - DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", - vstream->last_sent_index, vstream->stream_handle); - -end_unlock: - rcu_read_unlock(); - -end: - return ret; -} - -/* - * Send the next index for a stream - * - * Return 0 on success or else a negative value. - */ -static -int viewer_get_packet(struct relay_connection *conn) -{ - int ret, send_data = 0; - char *data = NULL; - uint32_t len = 0; - ssize_t read_len; - struct lttng_viewer_get_packet get_packet_info; - struct lttng_viewer_trace_packet reply; - struct relay_viewer_stream *stream; - struct relay_session *session; - struct ctf_trace *ctf_trace; - - assert(conn); - - DBG2("Relay get data packet"); - - health_code_update(); - - ret = recv_request(conn->sock, &get_packet_info, sizeof(get_packet_info)); - if (ret < 0) { - goto end; - } - health_code_update(); - - /* From this point on, the error label can be reached. */ - memset(&reply, 0, sizeof(reply)); - - rcu_read_lock(); - stream = viewer_stream_find_by_id(be64toh(get_packet_info.stream_id)); - if (!stream) { - goto error; - } - - session = session_find_by_id(conn->sessions_ht, stream->session_id); - if (!session) { - ret = -1; - goto error; - } - - ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, - stream->path_name); - assert(ctf_trace); - - /* - * First time we read this stream, we need open the tracefile, we should - * only arrive here if an index has already been sent to the viewer, so the - * tracefile must exist, if it does not it is a fatal error. - */ - if (stream->read_fd < 0) { - char fullpath[PATH_MAX]; - - if (stream->tracefile_count > 0) { - ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, stream->path_name, - stream->channel_name, - stream->tracefile_count_current); - } else { - ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, - stream->channel_name); - } - if (ret < 0) { - goto error; - } - ret = open(fullpath, O_RDONLY); - if (ret < 0) { - PERROR("Relay opening trace file"); - goto error; - } - stream->read_fd = ret; - } - - if (!ctf_trace->metadata_received || - ctf_trace->metadata_received > ctf_trace->metadata_sent) { - reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); - reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; - goto send_reply; - } - - ret = check_new_streams(conn); - if (ret < 0) { - goto end_unlock; - } else if (ret == 1) { - reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); - reply.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; - goto send_reply; - } - - len = be32toh(get_packet_info.len); - data = zmalloc(len); - if (!data) { - PERROR("relay data zmalloc"); - goto error; - } - - ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET); - if (ret < 0) { - /* - * If the read fd was closed by the streaming side, the - * abort_flag will be set to 1, otherwise it is an error. - */ - if (stream->abort_flag == 0) { - PERROR("lseek"); - goto error; - } - reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_EOF); - goto send_reply; - } - read_len = lttng_read(stream->read_fd, data, len); - if (read_len < len) { - /* - * If the read fd was closed by the streaming side, the - * abort_flag will be set to 1, otherwise it is an error. - */ - if (stream->abort_flag == 0) { - PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, - stream->read_fd, - be64toh(get_packet_info.offset)); - goto error; - } else { - reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_EOF); - goto send_reply; - } - } - reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); - reply.len = htobe32(len); - send_data = 1; - goto send_reply; - -error: - reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); - -send_reply: - reply.flags = htobe32(reply.flags); - - health_code_update(); - - ret = send_response(conn->sock, &reply, sizeof(reply)); - if (ret < 0) { - goto end_unlock; - } - health_code_update(); - - if (send_data) { - health_code_update(); - ret = send_response(conn->sock, data, len); - if (ret < 0) { - goto end_unlock; - } - health_code_update(); - } - - DBG("Sent %u bytes for stream %" PRIu64, len, - be64toh(get_packet_info.stream_id)); - -end_unlock: - free(data); - rcu_read_unlock(); - -end: - return ret; -} - -/* - * Send the session's metadata - * - * Return 0 on success else a negative value. - */ -static -int viewer_get_metadata(struct relay_connection *conn) -{ - int ret = 0; - ssize_t read_len; - uint64_t len = 0; - char *data = NULL; - struct lttng_viewer_get_metadata request; - struct lttng_viewer_metadata_packet reply; - struct relay_viewer_stream *stream; - struct ctf_trace *ctf_trace; - struct relay_session *session; - - assert(conn); - - DBG("Relay get metadata"); - - health_code_update(); - - ret = recv_request(conn->sock, &request, sizeof(request)); - if (ret < 0) { - goto end; - } - health_code_update(); - - memset(&reply, 0, sizeof(reply)); - - rcu_read_lock(); - stream = viewer_stream_find_by_id(be64toh(request.stream_id)); - if (!stream || !stream->metadata_flag) { - ERR("Invalid metadata stream"); - goto error; - } - - session = session_find_by_id(conn->sessions_ht, stream->session_id); - if (!session) { - ret = -1; - goto error; - } - - ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, - stream->path_name); - assert(ctf_trace); - assert(ctf_trace->metadata_sent <= ctf_trace->metadata_received); - - len = ctf_trace->metadata_received - ctf_trace->metadata_sent; - if (len == 0) { - reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); - goto send_reply; - } - - /* first time, we open the metadata file */ - if (stream->read_fd < 0) { - char fullpath[PATH_MAX]; - - ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, - stream->channel_name); - if (ret < 0) { - goto error; - } - ret = open(fullpath, O_RDONLY); - if (ret < 0) { - PERROR("Relay opening metadata file"); - goto error; - } - stream->read_fd = ret; - } - - reply.len = htobe64(len); - data = zmalloc(len); - if (!data) { - PERROR("viewer metadata zmalloc"); - goto error; - } - - read_len = lttng_read(stream->read_fd, data, len); - if (read_len < len) { - PERROR("Relay reading metadata file"); - goto error; - } - ctf_trace->metadata_sent += read_len; - reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); - goto send_reply; - -error: - reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); - -send_reply: - health_code_update(); - ret = send_response(conn->sock, &reply, sizeof(reply)); - if (ret < 0) { - goto end_unlock; - } - health_code_update(); - - if (len > 0) { - ret = send_response(conn->sock, data, len); - if (ret < 0) { - goto end_unlock; - } - } - - DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, - be64toh(request.stream_id)); - - DBG("Metadata sent"); - -end_unlock: - free(data); - rcu_read_unlock(); -end: - return ret; -} - -/* - * Create a viewer session. - * - * Return 0 on success or else a negative value. - */ -static -int viewer_create_session(struct relay_connection *conn) -{ - int ret; - struct lttng_viewer_create_session_response resp; - - DBG("Viewer create session received"); - - memset(&resp, 0, sizeof(resp)); - resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); - conn->viewer_session = zmalloc(sizeof(*conn->viewer_session)); - if (!conn->viewer_session) { - ERR("Allocation viewer session"); - resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); - goto send_reply; - } - CDS_INIT_LIST_HEAD(&conn->viewer_session->sessions_head); - -send_reply: - health_code_update(); - ret = send_response(conn->sock, &resp, sizeof(resp)); - if (ret < 0) { - goto end; - } - health_code_update(); - ret = 0; - -end: - return ret; -} - - -/* - * live_relay_unknown_command: send -1 if received unknown command - */ -static -void live_relay_unknown_command(struct relay_connection *conn) -{ - struct lttcomm_relayd_generic_reply reply; - - memset(&reply, 0, sizeof(reply)); - reply.ret_code = htobe32(LTTNG_ERR_UNK); - (void) send_response(conn->sock, &reply, sizeof(reply)); -} - -/* - * Process the commands received on the control socket - */ -static -int process_control(struct lttng_viewer_cmd *recv_hdr, - struct relay_connection *conn) -{ - int ret = 0; - uint32_t msg_value; - - assert(recv_hdr); - assert(conn); - - msg_value = be32toh(recv_hdr->cmd); - - /* - * Make sure we've done the version check before any command other then a - * new client connection. - */ - if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { - ERR("Viewer conn value %" PRIu32 " before version check", msg_value); - ret = -1; - goto end; - } - - switch (msg_value) { - case LTTNG_VIEWER_CONNECT: - ret = viewer_connect(conn); - break; - case LTTNG_VIEWER_LIST_SESSIONS: - ret = viewer_list_sessions(conn); - break; - case LTTNG_VIEWER_ATTACH_SESSION: - ret = viewer_attach_session(conn); - break; - case LTTNG_VIEWER_GET_NEXT_INDEX: - ret = viewer_get_next_index(conn); - break; - case LTTNG_VIEWER_GET_PACKET: - ret = viewer_get_packet(conn); - break; - case LTTNG_VIEWER_GET_METADATA: - ret = viewer_get_metadata(conn); - break; - case LTTNG_VIEWER_GET_NEW_STREAMS: - ret = viewer_get_new_streams(conn); - break; - case LTTNG_VIEWER_CREATE_SESSION: - ret = viewer_create_session(conn); - break; - default: - ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd)); - live_relay_unknown_command(conn); - ret = -1; - goto end; - } - -end: - return ret; -} - -static -void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) -{ - int ret; - - assert(events); - - (void) lttng_poll_del(events, pollfd); - - ret = close(pollfd); - if (ret < 0) { - ERR("Closing pollfd %d", pollfd); - } -} - -/* - * Delete and destroy a connection. - * - * RCU read side lock MUST be acquired. - */ -static void destroy_connection(struct lttng_ht *relay_connections_ht, - struct relay_connection *conn) -{ - struct relay_session *session, *tmp_session; - - assert(relay_connections_ht); - assert(conn); - - connection_delete(relay_connections_ht, conn); - - if (!conn->viewer_session) { - goto end; - } - - rcu_read_lock(); - cds_list_for_each_entry_safe(session, tmp_session, - &conn->viewer_session->sessions_head, - viewer_session_list) { - DBG("Cleaning connection of session ID %" PRIu64, session->id); - cleanup_session(conn, session); - } - rcu_read_unlock(); - -end: - connection_destroy(conn); -} - -/* - * This thread does the actual work - */ -static -void *thread_worker(void *data) -{ - int ret, err = -1; - uint32_t nb_fd; - struct relay_connection *conn; - struct lttng_poll_event events; - struct lttng_ht *relay_connections_ht; - struct lttng_ht_iter iter; - struct lttng_viewer_cmd recv_hdr; - struct relay_local_data *relay_ctx = (struct relay_local_data *) data; - struct lttng_ht *sessions_ht = relay_ctx->sessions_ht; - - DBG("[thread] Live viewer relay worker started"); - - rcu_register_thread(); - - health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); - - if (testpoint(relayd_thread_live_worker)) { - goto error_testpoint; - } - - /* table of connections indexed on socket */ - relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); - if (!relay_connections_ht) { - goto relay_connections_ht_error; - } - - ret = create_thread_poll_set(&events, 2); - if (ret < 0) { - goto error_poll_create; - } - - ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); - if (ret < 0) { - goto error; - } - -restart: - while (1) { - int i; - - health_code_update(); - - /* Infinite blocking call, waiting for transmission */ - DBG3("Relayd live viewer worker thread polling..."); - health_poll_entry(); - ret = lttng_poll_wait(&events, -1); - health_poll_exit(); - if (ret < 0) { - /* - * Restart interrupted system call. - */ - if (errno == EINTR) { - goto restart; - } - goto error; - } - - nb_fd = ret; - - /* - * Process control. The control connection is prioritised so we don't - * starve it with high throughput tracing data on the data - * connection. - */ - for (i = 0; i < nb_fd; i++) { - /* Fetch once the poll data */ - uint32_t revents = LTTNG_POLL_GETEV(&events, i); - int pollfd = LTTNG_POLL_GETFD(&events, i); - - health_code_update(); - - /* Thread quit pipe has been closed. Killing thread. */ - ret = check_thread_quit_pipe(pollfd, revents); - if (ret) { - err = 0; - goto exit; - } - - /* Inspect the relay conn pipe for new connection */ - if (pollfd == live_conn_pipe[0]) { - if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { - ERR("Relay live pipe error"); - goto error; - } else if (revents & LPOLLIN) { - ret = lttng_read(live_conn_pipe[0], &conn, sizeof(conn)); - if (ret < 0) { - goto error; - } - conn->sessions_ht = sessions_ht; - connection_init(conn); - lttng_poll_add(&events, conn->sock->fd, - LPOLLIN | LPOLLRDHUP); - rcu_read_lock(); - lttng_ht_add_unique_ulong(relay_connections_ht, - &conn->sock_n); - rcu_read_unlock(); - DBG("Connection socket %d added", conn->sock->fd); - } - } else { - rcu_read_lock(); - conn = connection_find_by_sock(relay_connections_ht, pollfd); - /* If not found, there is a synchronization issue. */ - assert(conn); - - if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { - cleanup_connection_pollfd(&events, pollfd); - destroy_connection(relay_connections_ht, conn); - } else if (revents & LPOLLIN) { - ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, - sizeof(recv_hdr), 0); - if (ret <= 0) { - /* Connection closed */ - cleanup_connection_pollfd(&events, pollfd); - destroy_connection(relay_connections_ht, conn); - DBG("Viewer control conn closed with %d", pollfd); - } else { - ret = process_control(&recv_hdr, conn); - if (ret < 0) { - /* Clear the session on error. */ - cleanup_connection_pollfd(&events, pollfd); - destroy_connection(relay_connections_ht, conn); - DBG("Viewer connection closed with %d", pollfd); - } - } - } - rcu_read_unlock(); - } - } - } - -exit: -error: - lttng_poll_clean(&events); - - /* Cleanup reamaining connection object. */ - rcu_read_lock(); - cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, conn, - sock_n.node) { - health_code_update(); - destroy_connection(relay_connections_ht, conn); - } - rcu_read_unlock(); -error_poll_create: - lttng_ht_destroy(relay_connections_ht); -relay_connections_ht_error: - /* Close relay conn pipes */ - utils_close_pipe(live_conn_pipe); - if (err) { - DBG("Viewer worker thread exited with error"); - } - DBG("Viewer worker thread cleanup complete"); -error_testpoint: - if (err) { - health_error(); - ERR("Health error occurred in %s", __func__); - } - health_unregister(health_relayd); - if (stop_threads()) { - ERR("Error stopping live threads"); - } - rcu_unregister_thread(); - return NULL; -} - -/* - * Create the relay command pipe to wake thread_manage_apps. - * Closed in cleanup(). - */ -static int create_conn_pipe(void) -{ - return utils_create_pipe_cloexec(live_conn_pipe); -} - -int relayd_live_stop(void) -{ - return stop_threads(); -} - -int relayd_live_join(void) -{ - int ret, retval = 0; - void *status; - - ret = pthread_join(live_listener_thread, &status); - if (ret) { - errno = ret; - PERROR("pthread_join live listener"); - retval = -1; - } - - ret = pthread_join(live_worker_thread, &status); - if (ret) { - errno = ret; - PERROR("pthread_join live worker"); - retval = -1; - } - - ret = pthread_join(live_dispatcher_thread, &status); - if (ret) { - errno = ret; - PERROR("pthread_join live dispatcher"); - retval = -1; - } - - cleanup_relayd_live(); - - return retval; -} - -/* - * main - */ -int relayd_live_create(struct lttng_uri *uri, - struct relay_local_data *relay_ctx) -{ - int ret = 0, retval = 0; - void *status; - int is_root; - - if (!uri) { - retval = -1; - goto exit_init_data; - } - live_uri = uri; - - /* Check if daemon is UID = 0 */ - is_root = !getuid(); - - if (!is_root) { - if (live_uri->port < 1024) { - ERR("Need to be root to use ports < 1024"); - retval = -1; - goto exit_init_data; - } - } - - /* Setup the thread apps communication pipe. */ - if (create_conn_pipe()) { - retval = -1; - goto exit_init_data; - } - - /* Init relay command queue. */ - cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); - - /* Set up max poll set size */ - lttng_poll_set_max_size(); - - /* Setup the dispatcher thread */ - ret = pthread_create(&live_dispatcher_thread, NULL, - thread_dispatcher, (void *) NULL); - if (ret) { - errno = ret; - PERROR("pthread_create viewer dispatcher"); - retval = -1; - goto exit_dispatcher_thread; - } - - /* Setup the worker thread */ - ret = pthread_create(&live_worker_thread, NULL, - thread_worker, relay_ctx); - if (ret) { - errno = ret; - PERROR("pthread_create viewer worker"); - retval = -1; - goto exit_worker_thread; - } - - /* Setup the listener thread */ - ret = pthread_create(&live_listener_thread, NULL, - thread_listener, (void *) NULL); - if (ret) { - errno = ret; - PERROR("pthread_create viewer listener"); - retval = -1; - goto exit_listener_thread; - } - - /* - * All OK, started all threads. - */ - return retval; - - - ret = pthread_join(live_listener_thread, &status); - if (ret) { - errno = ret; - PERROR("pthread_join live listener"); - retval = -1; - } -exit_listener_thread: - - ret = pthread_join(live_worker_thread, &status); - if (ret) { - errno = ret; - PERROR("pthread_join live worker"); - retval = -1; - } -exit_worker_thread: - - ret = pthread_join(live_dispatcher_thread, &status); - if (ret) { - errno = ret; - PERROR("pthread_join live dispatcher"); - retval = -1; - } -exit_dispatcher_thread: - -exit_init_data: - cleanup_relayd_live(); - - return retval; -}