+++ /dev/null
-/*
- * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
- * David Goulet <dgoulet@efficios.com>
- *
- * 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
-#include <getopt.h>
-#include <grp.h>
-#include <limits.h>
-#include <pthread.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/mman.h>
-#include <sys/mount.h>
-#include <sys/resource.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <inttypes.h>
-#include <urcu/futex.h>
-#include <urcu/uatomic.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <config.h>
-
-#include <lttng/lttng.h>
-#include <common/common.h>
-#include <common/compat/poll.h>
-#include <common/compat/socket.h>
-#include <common/defaults.h>
-#include <common/futex.h>
-#include <common/index/index.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-#include <common/sessiond-comm/inet.h>
-#include <common/sessiond-comm/relayd.h>
-#include <common/uri.h>
-#include <common/utils.h>
-
-#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(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 the session since the last
- * check 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(uint64_t session_id, struct lttng_ht *sessions_ht)
-{
- int ret;
- unsigned long current_val;
- struct relay_session *session;
-
- assert(sessions_ht);
-
- session = session_find_by_id(sessions_ht, session_id);
- if (!session) {
- DBG("Relay session %" PRIu64 " not found", session_id);
- ret = -1;
- goto error;
- }
-
- current_val = uatomic_cmpxchg(&session->new_streams, 1, 0);
- ret = current_val;
-
-error:
- 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
-void stop_threads(void)
-{
- int ret;
-
- /* Stopping all threads */
- DBG("Terminating all live threads");
- ret = notify_thread_pipe(live_conn_pipe[1]);
- if (ret < 0) {
- ERR("write error on thread quit pipe");
- }
-
- /* Dispatch thread */
- CMM_STORE_SHARED(live_dispatch_thread_exit, 1);
- futex_nto1_wake(&viewer_conn_queue.futex);
-}
-
-/*
- * 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, live_conn_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_live_conn_pipe(int fd, uint32_t events)
-{
- if (fd == live_conn_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_live_conn_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_wfq_enqueue(&viewer_conn_queue.queue, &new_conn->qnode);
-
- /*
- * Wake the dispatch queue futex. Implicit memory barrier with
- * the exchange in cds_wfq_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");
- stop_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_wfq_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_wfq_dequeue_blocking(&viewer_conn_queue.queue);
- 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");
- stop_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();
-
- 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();
-
- rcu_read_unlock();
- ret = 0;
- goto end;
-
-end_unlock:
- rcu_read_unlock();
-
-end:
- return ret;
-}
-
-/*
- * 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;
-
- 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;
- }
-
- health_code_update();
-
- 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_NEW_STREAMS_ERR);
- goto send_reply;
- }
-
- if (conn->session_id == session->id) {
- /* We confirmed the viewer is asking for the same session. */
- send_streams = 1;
- response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK);
- } else {
- send_streams = 0;
- response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR);
- goto send_reply;
- }
-
- if (!send_streams) {
- goto send_reply;
- }
-
- 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);
- 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();
-
- 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);
- conn->session_id = session->id;
- conn->session = session;
- }
-
- 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;
- }
-
- if (!send_streams) {
- 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;
-}
-
-/*
- * 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;
- 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();
- session = session_find_by_id(conn->sessions_ht, conn->session_id);
- if (!session) {
- ret = -1;
- goto end_unlock;
- }
-
- vstream = viewer_stream_find_by_id(be64toh(request_index.stream_id));
- if (!vstream) {
- 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;
- }
-
- /* First time, we open the index file */
- if (vstream->index_read_fd < 0) {
- ret = index_open(vstream->path_name, vstream->channel_name,
- vstream->tracefile_count, vstream->tracefile_count_current);
- 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);
- goto send_reply;
- } else if (ret < 0) {
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
- goto send_reply;
- }
- vstream->index_read_fd = ret;
- }
-
- rstream = stream_find_by_id(relay_streams_ht, vstream->stream_handle);
- assert(rstream);
-
- if (!rstream->close_flag) {
- if (vstream->abort_flag) {
- /* Rotate on abort (overwrite). */
- DBG("Viewer rotate because of overwrite");
- ret = viewer_stream_rotate(vstream, rstream);
- 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);
- goto send_reply;
- }
- /* ret == 0 means successful so we continue. */
- }
-
- pthread_mutex_lock(&rstream->viewer_stream_rotation_lock);
- if (rstream->tracefile_count_current == vstream->tracefile_count_current) {
- if (rstream->beacon_ts_end != -1ULL &&
- vstream->last_sent_index == rstream->total_index_received) {
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE);
- viewer_index.timestamp_end = htobe64(rstream->beacon_ts_end);
- pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock);
- goto send_reply;
- } 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.
- */
- pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock);
- /* No new index to send, retry later. */
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
- goto send_reply;
- }
- }
- pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock);
- } 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 */
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP);
- viewer_stream_delete(vstream);
- viewer_stream_destroy(ctf_trace, vstream);
- goto send_reply;
- } else {
- vstream->close_write_flag = 1;
- }
-
- 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(vstream->session_id, conn->sessions_ht);
- if (ret < 0) {
- goto end_unlock;
- } else if (ret == 1) {
- viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM;
- }
-
- pthread_mutex_lock(&vstream->overwrite_lock);
- if (vstream->abort_flag) {
- /*
- * The file is being overwritten by the writer, we cannot * use it.
- */
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
- pthread_mutex_unlock(&vstream->overwrite_lock);
- ret = viewer_stream_rotate(vstream, rstream);
- 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);
- goto send_reply;
- }
- goto send_reply;
- }
-
- ret = lttng_read(vstream->index_read_fd, &packet_index,
- sizeof(packet_index));
- pthread_mutex_unlock(&vstream->overwrite_lock);
- if (ret < sizeof(packet_index)) {
- /*
- * The tracefile is closed in write, so we read up to EOF.
- */
- if (vstream->close_write_flag == 1) {
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
- /* Rotate on normal EOF */
- ret = viewer_stream_rotate(vstream, rstream);
- 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);
- goto send_reply;
- }
- } else {
- PERROR("Relay reading index file %d", vstream->index_read_fd);
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
- }
- 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 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;
- }
-
- ctf_trace = ctf_trace_find_by_path(conn->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(stream->session_id, conn->sessions_ht);
- 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;
-
- 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();
-
- rcu_read_lock();
- stream = viewer_stream_find_by_id(be64toh(request.stream_id));
- if (!stream || !stream->metadata_flag) {
- ERR("Invalid metadata stream");
- goto error;
- }
-
- ctf_trace = ctf_trace_find_by_path(conn->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");
-
- 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;
-
- 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 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);
- }
-}
-
-/*
- * 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;
-
- assert(relay_connections_ht);
- assert(conn);
-
- DBG("Cleaning connection of session ID %" PRIu64, conn->session_id);
-
- connection_delete(relay_connections_ht, conn);
-
- rcu_read_lock();
- session = session_find_by_id(conn->sessions_ht, conn->session_id);
- if (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);
- session_viewer_try_destroy(conn->sessions_ht, session);
- }
- rcu_read_unlock();
-
- 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_live_conn_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);
- stop_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)
-{
- int ret;
-
- ret = utils_create_pipe_cloexec(live_conn_pipe);
-
- return ret;
-}
-
-void live_stop_threads(void)
-{
- int ret;
- void *status;
-
- stop_threads();
-
- ret = pthread_join(live_listener_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join live listener");
- goto error; /* join error, exit without cleanup */
- }
-
- ret = pthread_join(live_worker_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join live worker");
- goto error; /* join error, exit without cleanup */
- }
-
- ret = pthread_join(live_dispatcher_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join live dispatcher");
- goto error; /* join error, exit without cleanup */
- }
-
- cleanup();
-
-error:
- return;
-}
-
-/*
- * main
- */
-int live_start_threads(struct lttng_uri *uri,
- struct relay_local_data *relay_ctx)
-{
- int ret = 0;
- void *status;
- int is_root;
-
- assert(uri);
- 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");
- ret = -1;
- goto exit;
- }
- }
-
- /* Setup the thread apps communication pipe. */
- if ((ret = create_conn_pipe()) < 0) {
- goto exit;
- }
-
- /* Init relay command queue. */
- cds_wfq_init(&viewer_conn_queue.queue);
-
- /* 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 != 0) {
- PERROR("pthread_create viewer dispatcher");
- goto exit_dispatcher;
- }
-
- /* Setup the worker thread */
- ret = pthread_create(&live_worker_thread, NULL,
- thread_worker, relay_ctx);
- if (ret != 0) {
- PERROR("pthread_create viewer worker");
- goto exit_worker;
- }
-
- /* Setup the listener thread */
- ret = pthread_create(&live_listener_thread, NULL,
- thread_listener, (void *) NULL);
- if (ret != 0) {
- PERROR("pthread_create viewer listener");
- goto exit_listener;
- }
-
- ret = 0;
- goto end;
-
-exit_listener:
- ret = pthread_join(live_listener_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join live listener");
- goto error; /* join error, exit without cleanup */
- }
-
-exit_worker:
- ret = pthread_join(live_worker_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join live worker");
- goto error; /* join error, exit without cleanup */
- }
-
-exit_dispatcher:
- ret = pthread_join(live_dispatcher_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join live dispatcher");
- goto error; /* join error, exit without cleanup */
- }
-
-exit:
- cleanup();
-
-end:
-error:
- return ret;
-}
projects / lttng-tools.git / blobdiff