#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 "cmd.h"
#include "live.h"
#include "lttng-relayd.h"
-#include "lttng-viewer.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"
static struct lttng_uri *live_uri;
-/*
- * Quit pipe for all threads. This permits a single cancellation point
- * for all threads when receiving an event on the pipe.
- */
-static int live_thread_quit_pipe[2] = { -1, -1 };
-
/*
* This pipe is used to inform the worker thread that a command is queued and
* ready to be processed.
{
DBG("Cleaning up");
- /* Close thread quit pipes */
- utils_close_pipe(live_thread_quit_pipe);
free(live_uri);
}
/*
- * Write to writable pipe used to notify a thread.
+ * 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
-int notify_thread_pipe(int wpipe)
+ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size)
{
- int ret;
+ ssize_t ret;
- do {
- ret = write(wpipe, "!", 1);
- } while (ret < 0 && errno == EINTR);
- if (ret < 0 || ret != 1) {
- PERROR("write poll pipe");
+ 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;
}
/*
- * Stop all threads by closing the thread quit pipe.
+ * 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
-void stop_threads(void)
+ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size)
{
- int ret;
+ ssize_t ret;
- /* Stopping all threads */
- DBG("Terminating all live threads");
- ret = notify_thread_pipe(live_thread_quit_pipe[1]);
+ assert(sock);
+ assert(buf);
+
+ ret = sock->ops->sendmsg(sock, buf, size, 0);
if (ret < 0) {
- ERR("write error on thread quit pipe");
+ ERR("Relayd failed to send response.");
}
- /* Dispatch thread */
- CMM_STORE_SHARED(live_dispatch_thread_exit, 1);
- futex_nto1_wake(&viewer_cmd_queue.futex);
+ 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;
}
/*
- * Init thread quit pipe.
+ * 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 -1 on error or 0 if all pipes are created.
+ * Return 0 on success or else a negative value.
*/
static
-int init_thread_quit_pipe(void)
+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);
- ret = utils_create_pipe_cloexec(live_thread_quit_pipe);
+ /*
+ * 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_cmd_queue.futex);
+}
+
/*
* Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
*/
}
/* Add quit pipe */
- ret = lttng_poll_add(events, live_thread_quit_pipe[0], LPOLLIN);
+ ret = lttng_poll_add(events, live_conn_pipe[0], LPOLLIN | LPOLLERR);
if (ret < 0) {
goto error;
}
* Return 1 if it was triggered else 0;
*/
static
-int check_thread_quit_pipe(int fd, uint32_t events)
+int check_live_conn_pipe(int fd, uint32_t events)
{
- if (fd == live_thread_quit_pipe[0] && (events & LPOLLIN)) {
+ if (fd == live_conn_pipe[0] && (events & LPOLLIN)) {
return 1;
}
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 3 as size here for the thread quit pipe, control and data socket.
- */
+ /* 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;
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.
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);
+ ret = check_live_conn_pipe(pollfd, revents);
if (ret) {
err = 0;
goto exit;
exit:
error:
error_poll_add:
+error_testpoint:
lttng_poll_clean(&events);
error_create_poll:
if (live_control_sock->fd >= 0) {
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;
static
void *thread_dispatcher(void *data)
{
- int ret;
+ int err = -1;
+ ssize_t ret;
struct cds_wfq_node *node;
struct relay_command *relay_cmd = 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_cmd_queue.futex);
do {
+ health_code_update();
+
/* Dequeue commands */
node = cds_wfq_dequeue_blocking(&viewer_cmd_queue.queue);
if (node == NULL) {
* so we can be assured that the data will be read at some point in
* time or wait to the end of the world :)
*/
- do {
- ret = write(live_relay_cmd_pipe[1], relay_cmd,
- sizeof(*relay_cmd));
- } while (ret < 0 && errno == EINTR);
+ ret = lttng_write(live_relay_cmd_pipe[1], relay_cmd,
+ sizeof(*relay_cmd));
free(relay_cmd);
- if (ret < 0 || ret != sizeof(struct relay_command)) {
+ if (ret < sizeof(struct relay_command)) {
PERROR("write cmd pipe");
goto error;
}
} while (node != NULL);
/* Futex wait on queue. Blocking call on futex() */
+ health_poll_entry();
futex_nto1_wait(&viewer_cmd_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;
cmd->version_check_done = 1;
- /* Get version from the other side. */
- ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0);
- if (ret < 0 || ret != sizeof(msg)) {
- if (ret == 0) {
- /* Orderly shutdown. Not necessary to print an error. */
- DBG("Socket %d did an orderly shutdown", cmd->sock->fd);
- } else {
- ERR("Relay failed to receive the version values.");
- }
- ret = -1;
+ health_code_update();
+
+ DBG("Viewer is establishing a connection to the relayd.");
+
+ ret = recv_request(cmd->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 (%u vs %u)", reply.major,
- be32toh(msg.major));
- ret = 0;
+ DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
+ reply.major, be32toh(msg.major));
+ ret = -1;
goto end;
}
if (cmd->type == RELAY_VIEWER_COMMAND) {
reply.viewer_session_id = htobe64(++last_relay_viewer_session_id);
}
- ret = cmd->sock->ops->sendmsg(cmd->sock, &reply,
- sizeof(struct lttng_viewer_connect), 0);
+
+ health_code_update();
+
+ ret = send_response(cmd->sock, &reply, sizeof(reply));
if (ret < 0) {
- ERR("Relay sending version");
+ goto end;
}
+ health_code_update();
+
DBG("Version check done using protocol %u.%u", cmd->major, cmd->minor);
ret = 0;
struct lttng_viewer_list_sessions session_list;
unsigned long count;
long approx_before, approx_after;
- struct lttng_ht_node_ulong *node;
struct lttng_ht_iter iter;
struct lttng_viewer_session send_session;
struct relay_session *session;
DBG("List sessions received");
- if (cmd->version_check_done == 0) {
- ERR("Trying to list sessions before version check");
- ret = -1;
- goto end_no_session;
- }
-
rcu_read_lock();
cds_lfht_count_nodes(sessions_ht->ht, &approx_before, &count, &approx_after);
session_list.sessions_count = htobe32(count);
- ret = cmd->sock->ops->sendmsg(cmd->sock, &session_list,
- sizeof(session_list), 0);
+ health_code_update();
+
+ ret = send_response(cmd->sock, &session_list, sizeof(session_list));
if (ret < 0) {
- ERR("Relay sending sessions list");
goto end_unlock;
}
- cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, node, node) {
- node = lttng_ht_iter_get_node_ulong(&iter);
- if (!node) {
- goto end_unlock;
- }
- session = caa_container_of(node, struct relay_session, session_n);
+ health_code_update();
+
+ cds_lfht_for_each_entry(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));
sizeof(send_session.hostname));
send_session.id = htobe64(session->id);
send_session.live_timer = htobe32(session->live_timer);
- send_session.clients = htobe32(session->viewer_attached);
+ send_session.clients = htobe32(session->viewer_refcount);
+ send_session.streams = htobe32(session->stream_count);
- ret = cmd->sock->ops->sendmsg(cmd->sock, &send_session,
- sizeof(send_session), 0);
+ health_code_update();
+
+ ret = send_response(cmd->sock, &send_session, sizeof(send_session));
if (ret < 0) {
- ERR("Relay sending session info");
goto end_unlock;
}
}
+ health_code_update();
+
rcu_read_unlock();
ret = 0;
goto end;
rcu_read_unlock();
end:
-end_no_session:
return ret;
}
/*
- * Allocate and init a new viewer_stream.
- *
- * Copies the values from the stream passed in parameter and insert the new
- * stream in the viewer_streams_ht.
- *
- * MUST be called with rcu_read_lock held.
- *
- * Returns 0 on success or a negative value on error.
+ * Send the viewer the list of current sessions.
*/
static
-int init_viewer_stream(struct relay_stream *stream)
+int viewer_get_new_streams(struct relay_command *cmd,
+ struct lttng_ht *sessions_ht)
{
- int ret;
- struct relay_viewer_stream *viewer_stream;
+ 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(cmd);
+ assert(sessions_ht);
- assert(stream);
+ DBG("Get new streams received");
- viewer_stream = zmalloc(sizeof(*viewer_stream));
- if (!viewer_stream) {
- PERROR("relay viewer stream zmalloc");
- ret = -1;
+ health_code_update();
+
+ /* Receive the request from the connected client. */
+ ret = recv_request(cmd->sock, &request, sizeof(request));
+ if (ret < 0) {
goto error;
}
- viewer_stream->read_fd = -1;
- viewer_stream->index_read_fd = -1;
- viewer_stream->session_id = stream->session->id;
- viewer_stream->stream_handle = stream->stream_handle;
- viewer_stream->path_name = strndup(stream->path_name,
- LTTNG_VIEWER_PATH_MAX);
- viewer_stream->channel_name = strndup(stream->channel_name,
- LTTNG_VIEWER_NAME_MAX);
- viewer_stream->total_index_received = stream->total_index_received;
- viewer_stream->tracefile_size = stream->tracefile_size;
- viewer_stream->tracefile_count = stream->tracefile_count;
- viewer_stream->metadata_flag = stream->metadata_flag;
+ health_code_update();
+
+ rcu_read_lock();
+ session = session_find_by_id(sessions_ht, be64toh(request.session_id));
+ if (!session) {
+ DBG("Relay session %" PRIu64 " not found",
+ be64toh(request.session_id));
+ response.status = htobe32(VIEWER_NEW_STREAMS_ERR);
+ goto send_reply;
+ }
+
+ if (cmd->session_id == session->id) {
+ /* We confirmed the viewer is asking for the same session. */
+ send_streams = 1;
+ response.status = htobe32(VIEWER_NEW_STREAMS_OK);
+ } else {
+ send_streams = 0;
+ response.status = htobe32(VIEWER_NEW_STREAMS_ERR);
+ goto send_reply;
+ }
+
+ if (!send_streams) {
+ goto send_reply;
+ }
+
+ ret = make_viewer_streams(session, 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);
+
+send_reply:
+ health_code_update();
+ ret = send_response(cmd->sock, &response, sizeof(response));
+ if (ret < 0) {
+ goto end_unlock;
+ }
+ health_code_update();
/*
- * This is to avoid a race between the initialization of this object and
- * the close of the given stream. If the stream is unable to find this
- * viewer stream when closing, this copy will at least take the latest
- * value.
+ * Unknown or empty session, just return gracefully, the viewer knows what
+ * is happening.
*/
- viewer_stream->total_index_received = stream->total_index_received;
+ if (!send_streams || !nb_streams) {
+ ret = 0;
+ goto end_unlock;
+ }
/*
- * The deletion of this ctf_trace object is only done in a call RCU of the
- * relay stream making it valid as long as we have the read side lock.
+ * 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.
*/
- viewer_stream->ctf_trace = stream->ctf_trace;
- uatomic_inc(&viewer_stream->ctf_trace->refcount);
-
- lttng_ht_node_init_u64(&viewer_stream->stream_n, stream->stream_handle);
- lttng_ht_add_unique_u64(viewer_streams_ht, &viewer_stream->stream_n);
-
- ret = 0;
+ ret = send_viewer_streams(cmd->sock, session, 0);
+ if (ret < 0) {
+ goto end_unlock;
+ }
+end_unlock:
+ rcu_read_unlock();
error:
return ret;
}
int viewer_attach_session(struct relay_command *cmd,
struct lttng_ht *sessions_ht)
{
- int ret, send_streams = 0, nb_streams = 0;
+ 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 lttng_viewer_stream send_stream;
- struct relay_stream *stream;
- struct relay_viewer_stream *viewer_stream;
- struct lttng_ht_node_ulong *node;
- struct lttng_ht_node_u64 *node64;
- struct lttng_ht_iter iter;
struct relay_session *session;
assert(cmd);
assert(sessions_ht);
- DBG("Attach session received");
+ health_code_update();
- if (cmd->version_check_done == 0) {
- ERR("Trying to attach session before version check");
- ret = -1;
- goto end_no_session;
- }
-
- ret = cmd->sock->ops->recvmsg(cmd->sock, &request, sizeof(request), 0);
- if (ret < 0 || ret != sizeof(request)) {
- if (ret == 0) {
- /* Orderly shutdown. Not necessary to print an error. */
- DBG("Socket %d did an orderly shutdown", cmd->sock->fd);
- } else {
- ERR("Relay failed to receive the attach parameters.");
- }
- ret = -1;
+ /* Receive the request from the connected client. */
+ ret = recv_request(cmd->sock, &request, sizeof(request));
+ if (ret < 0) {
goto error;
}
+ health_code_update();
+
rcu_read_lock();
- lttng_ht_lookup(sessions_ht,
- (void *)((unsigned long) be64toh(request.session_id)), &iter);
- node = lttng_ht_iter_get_node_ulong(&iter);
- if (node == NULL) {
+ session = session_find_by_id(sessions_ht, be64toh(request.session_id));
+ if (!session) {
DBG("Relay session %" PRIu64 " not found",
be64toh(request.session_id));
response.status = htobe32(VIEWER_ATTACH_UNK);
goto send_reply;
}
+ session_viewer_attach(session);
+ DBG("Attach session ID %" PRIu64 " received", be64toh(request.session_id));
- session = caa_container_of(node, struct relay_session, session_n);
- if (cmd->session_id == session->id) {
- /* Same viewer already attached, just send the stream list. */
- send_streams = 1;
- response.status = htobe32(VIEWER_ATTACH_OK);
- } else if (session->viewer_attached != 0) {
+ if (uatomic_read(&session->viewer_refcount) > 1) {
DBG("Already a viewer attached");
response.status = htobe32(VIEWER_ATTACH_ALREADY);
+ session_viewer_detach(session);
goto send_reply;
} else if (session->live_timer == 0) {
DBG("Not live session");
response.status = htobe32(VIEWER_ATTACH_NOT_LIVE);
goto send_reply;
} else {
- session->viewer_attached++;
send_streams = 1;
response.status = htobe32(VIEWER_ATTACH_OK);
cmd->session_id = session->id;
switch (be32toh(request.seek)) {
case VIEWER_SEEK_BEGINNING:
- /* Default behaviour. */
- break;
case VIEWER_SEEK_LAST:
- /* TODO */
+ seek_type = be32toh(request.seek);
break;
default:
ERR("Wrong seek parameter");
goto send_reply;
}
- if (send_streams) {
- /* We should only be there if we have a session to attach to. */
- assert(session);
-
- /*
- * Fill the viewer_streams_ht to count the number of streams
- * ready to be sent and avoid concurrency issues on the
- * relay_streams_ht and don't rely on a total session stream count.
- */
- cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, node, node) {
- struct relay_viewer_stream *vstream;
-
- node = lttng_ht_iter_get_node_ulong(&iter);
- if (!node) {
- continue;
- }
- stream = caa_container_of(node, struct relay_stream, stream_n);
- if (stream->session != cmd->session) {
- continue;
- }
-
- /*
- * Don't send streams with no ctf_trace, they are not ready to be
- * read.
- */
- if (!stream->ctf_trace) {
- continue;
- }
+ if (!send_streams) {
+ goto send_reply;
+ }
- vstream = live_find_viewer_stream_by_id(stream->stream_handle);
- if (!vstream) {
- ret = init_viewer_stream(stream);
- if (ret < 0) {
- goto end_unlock;
- }
- }
- nb_streams++;
- }
- response.streams_count = htobe32(nb_streams);
+ 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:
- ret = cmd->sock->ops->sendmsg(cmd->sock, &response, sizeof(response), 0);
+ health_code_update();
+ ret = send_response(cmd->sock, &response, sizeof(response));
if (ret < 0) {
- ERR("Relay sending viewer attach response");
goto end_unlock;
}
+ health_code_update();
/*
- * Unknown or busy session, just return gracefully, the viewer knows what
+ * Unknown or empty session, just return gracefully, the viewer knows what
* is happening.
*/
- if (!send_streams) {
+ if (!send_streams || !nb_streams) {
ret = 0;
goto end_unlock;
}
- /* We should only be there if we have a session to attach to. */
- assert(session);
- cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) {
- node64 = lttng_ht_iter_get_node_u64(&iter);
- if (!node64) {
- continue;
- }
- viewer_stream = caa_container_of(node64, struct relay_viewer_stream,
- stream_n);
- if (viewer_stream->session_id != cmd->session->id) {
- continue;
- }
-
- send_stream.id = htobe64(viewer_stream->stream_handle);
- send_stream.ctf_trace_id = htobe64(viewer_stream->ctf_trace->id);
- send_stream.metadata_flag = htobe32(viewer_stream->metadata_flag);
- strncpy(send_stream.path_name, viewer_stream->path_name,
- sizeof(send_stream.path_name));
- strncpy(send_stream.channel_name, viewer_stream->channel_name,
- sizeof(send_stream.channel_name));
-
- ret = cmd->sock->ops->sendmsg(cmd->sock, &send_stream,
- sizeof(send_stream), 0);
- if (ret < 0) {
- ERR("Relay sending stream %" PRIu64, viewer_stream->stream_handle);
- goto end_unlock;
- }
- DBG("Sent stream %" PRIu64 " to viewer", viewer_stream->stream_handle);
+ /* Send stream and ignore the sent flag. */
+ ret = send_viewer_streams(cmd->sock, session, 1);
+ if (ret < 0) {
+ goto end_unlock;
}
- ret = 0;
end_unlock:
rcu_read_unlock();
-end_no_session:
error:
return ret;
}
-/*
- * Open index file using a given viewer stream.
- *
- * Return 0 on success or else a negative value.
- */
-static int open_index(struct relay_viewer_stream *stream)
-{
- int ret;
- char fullpath[PATH_MAX];
- struct lttng_packet_index_file_hdr hdr;
-
- if (stream->tracefile_size > 0) {
- /* For now we don't support on-disk ring buffer. */
- ret = -1;
- goto end;
- } else {
- ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR
- "/%s" DEFAULT_INDEX_FILE_SUFFIX,
- stream->path_name, stream->channel_name);
- if (ret < 0) {
- PERROR("snprintf index path");
- goto error;
- }
- }
-
- DBG("Opening index file %s in read only", fullpath);
- ret = open(fullpath, O_RDONLY);
- if (ret < 0) {
- if (errno == ENOENT) {
- ret = ENOENT;
- goto error;
- } else {
- PERROR("opening index in read-only");
- }
- goto error;
- }
- stream->index_read_fd = ret;
- DBG("Opening index file %s in read only, (fd: %d)", fullpath, ret);
-
- do {
- ret = read(stream->index_read_fd, &hdr, sizeof(hdr));
- } while (ret < 0 && errno == EINTR);
- if (ret < 0) {
- PERROR("Reading index header");
- goto error;
- }
- if (strncmp(hdr.magic, INDEX_MAGIC, sizeof(hdr.magic)) != 0) {
- ERR("Invalid header magic");
- ret = -1;
- goto error;
- }
- if (be32toh(hdr.index_major) != INDEX_MAJOR ||
- be32toh(hdr.index_minor) != INDEX_MINOR) {
- ERR("Invalid header version");
- ret = -1;
- goto error;
- }
- ret = 0;
-
-error:
-end:
- return ret;
-}
-
-/*
- * Get viewer stream from stream id.
- *
- * RCU read side lock MUST be acquired.
- */
-struct relay_viewer_stream *live_find_viewer_stream_by_id(uint64_t stream_id)
-{
- struct lttng_ht_node_u64 *node;
- struct lttng_ht_iter iter;
- struct relay_viewer_stream *stream = NULL;
-
- lttng_ht_lookup(viewer_streams_ht, &stream_id, &iter);
- node = lttng_ht_iter_get_node_u64(&iter);
- if (node == NULL) {
- DBG("Relay viewer stream %" PRIu64 " not found", stream_id);
- goto end;
- }
- stream = caa_container_of(node, struct relay_viewer_stream, stream_n);
-
-end:
- return stream;
-}
-
/*
* Send the next index for a stream.
*
int ret;
struct lttng_viewer_get_next_index request_index;
struct lttng_viewer_index viewer_index;
- struct lttng_packet_index packet_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(cmd);
assert(sessions_ht);
DBG("Viewer get next index");
- if (cmd->version_check_done == 0) {
- ERR("Trying to request index before version check");
- ret = -1;
- goto end_no_session;
- }
+ health_code_update();
- ret = cmd->sock->ops->recvmsg(cmd->sock, &request_index,
- sizeof(request_index), 0);
- if (ret < 0 || ret != sizeof(request_index)) {
- ret = -1;
- ERR("Relay didn't receive the whole packet");
+ ret = recv_request(cmd->sock, &request_index, sizeof(request_index));
+ if (ret < 0) {
goto end;
}
+ health_code_update();
rcu_read_lock();
- vstream = live_find_viewer_stream_by_id(be64toh(request_index.stream_id));
+ session = session_find_by_id(sessions_ht, cmd->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));
/*
/* First time, we open the index file */
if (vstream->index_read_fd < 0) {
- ret = open_index(vstream);
- if (ret == ENOENT) {
+ 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(VIEWER_INDEX_ERR);
goto send_reply;
}
+ vstream->index_read_fd = ret;
}
- rstream = relay_stream_find_by_id(vstream->stream_handle);
- if (rstream) {
- if (rstream->beacon_ts_end != -1ULL &&
- vstream->last_sent_index == rstream->total_index_received) {
- viewer_index.status = htobe32(VIEWER_INDEX_INACTIVE);
- viewer_index.timestamp_end = htobe64(rstream->beacon_ts_end);
- goto send_reply;
+ 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(VIEWER_INDEX_HUP);
+ viewer_stream_delete(vstream);
+ viewer_stream_destroy(ctf_trace, vstream);
+ goto send_reply;
+ }
+ /* ret == 0 means successful so we continue. */
}
- if (rstream->total_index_received <= vstream->last_sent_index) {
- /* No new index to send, retry later. */
- viewer_index.status = htobe32(VIEWER_INDEX_RETRY);
- goto send_reply;
+ 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(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(VIEWER_INDEX_RETRY);
+ goto send_reply;
+ }
}
- } else if (!rstream &&
+ 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 stream closed */
+ /* Last index sent and current tracefile closed in write */
viewer_index.status = htobe32(VIEWER_INDEX_HUP);
+ viewer_stream_delete(vstream);
+ viewer_stream_destroy(ctf_trace, vstream);
goto send_reply;
+ } else {
+ vstream->close_write_flag = 1;
}
- if (!vstream->ctf_trace->metadata_received ||
- vstream->ctf_trace->metadata_received >
- vstream->ctf_trace->metadata_sent) {
+ if (!ctf_trace->metadata_received ||
+ ctf_trace->metadata_received > ctf_trace->metadata_sent) {
viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA;
}
- do {
- ret = read(vstream->index_read_fd, &packet_index,
- sizeof(packet_index));
- } while (ret < 0 && errno == EINTR);
+ ret = check_new_streams(vstream->session_id, 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(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(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)) {
- PERROR("Relay reading index file");
- viewer_index.status = htobe32(VIEWER_INDEX_ERR);
+ /*
+ * The tracefile is closed in write, so we read up to EOF.
+ */
+ if (vstream->close_write_flag == 1) {
+ viewer_index.status = htobe32(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(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(VIEWER_INDEX_ERR);
+ }
+ goto send_reply;
} else {
viewer_index.status = htobe32(VIEWER_INDEX_OK);
vstream->last_sent_index++;
send_reply:
viewer_index.flags = htobe32(viewer_index.flags);
- ret = cmd->sock->ops->sendmsg(cmd->sock, &viewer_index,
- sizeof(viewer_index), 0);
+ health_code_update();
+
+ ret = send_response(cmd->sock, &viewer_index, sizeof(viewer_index));
if (ret < 0) {
- ERR("Relay index to viewer");
goto end_unlock;
}
+ health_code_update();
- DBG("Index %" PRIu64 "for stream %" PRIu64 "sent",
+ DBG("Index %" PRIu64 " for stream %" PRIu64 " sent",
vstream->last_sent_index, vstream->stream_handle);
end_unlock:
rcu_read_unlock();
-end_no_session:
end:
return ret;
}
* Return 0 on success or else a negative value.
*/
static
-int viewer_get_packet(struct relay_command *cmd)
+int viewer_get_packet(struct relay_command *cmd,
+ struct lttng_ht *sessions_ht)
{
int ret, send_data = 0;
char *data = NULL;
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(cmd);
DBG2("Relay get data packet");
- if (cmd->version_check_done == 0) {
- ERR("Trying to get packet before version check");
- ret = -1;
- goto end;
- }
+ health_code_update();
- ret = cmd->sock->ops->recvmsg(cmd->sock, &get_packet_info,
- sizeof(get_packet_info), 0);
- if (ret < 0 || ret != sizeof(get_packet_info)) {
- ret = -1;
- ERR("Relay didn't receive the whole packet");
+ ret = recv_request(cmd->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 = live_find_viewer_stream_by_id(be64toh(get_packet_info.stream_id));
+ stream = viewer_stream_find_by_id(be64toh(get_packet_info.stream_id));
if (!stream) {
goto error;
}
- assert(stream->ctf_trace);
+
+ ctf_trace = ctf_trace_find_by_path(cmd->session->ctf_traces_ht,
+ stream->path_name);
+ assert(ctf_trace);
/*
* First time we read this stream, we need open the tracefile, we should
if (stream->read_fd < 0) {
char fullpath[PATH_MAX];
- ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name,
- stream->channel_name);
+ 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;
}
stream->read_fd = ret;
}
- memset(&reply, 0, sizeof(reply));
-
- if (!stream->ctf_trace->metadata_received ||
- stream->ctf_trace->metadata_received >
- stream->ctf_trace->metadata_sent) {
+ if (!ctf_trace->metadata_received ||
+ ctf_trace->metadata_received > ctf_trace->metadata_sent) {
reply.status = htobe32(VIEWER_GET_PACKET_ERR);
reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA;
+ goto send_reply;
+ }
+ ret = check_new_streams(stream->session_id, sessions_ht);
+ if (ret < 0) {
+ goto end_unlock;
+ } else if (ret == 1) {
+ reply.status = htobe32(VIEWER_GET_PACKET_ERR);
+ reply.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM;
goto send_reply;
}
ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET);
if (ret < 0) {
- PERROR("lseek");
- goto error;
+ /*
+ * 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(VIEWER_GET_PACKET_EOF);
+ goto send_reply;
}
- read_len = read(stream->read_fd, data, len);
- if (read_len < (ssize_t) len) {
- PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64,
- stream->read_fd, be64toh(get_packet_info.offset));
- goto error;
+ 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(VIEWER_GET_PACKET_EOF);
+ goto send_reply;
+ }
}
reply.status = htobe32(VIEWER_GET_PACKET_OK);
reply.len = htobe32(len);
send_reply:
reply.flags = htobe32(reply.flags);
- ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0);
+
+ health_code_update();
+
+ ret = send_response(cmd->sock, &reply, sizeof(reply));
if (ret < 0) {
- ERR("Relay data header to viewer");
goto end_unlock;
}
+ health_code_update();
if (send_data) {
- ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0);
+ health_code_update();
+ ret = send_response(cmd->sock, data, len);
if (ret < 0) {
- ERR("Relay send data to viewer");
goto end_unlock;
}
+ health_code_update();
}
DBG("Sent %u bytes for stream %" PRIu64, len,
struct lttng_viewer_get_metadata request;
struct lttng_viewer_metadata_packet reply;
struct relay_viewer_stream *stream;
+ struct ctf_trace *ctf_trace;
assert(cmd);
DBG("Relay get metadata");
- if (cmd->version_check_done == 0) {
- ERR("Trying to get metadata before version check");
- ret = -1;
- goto end;
- }
+ health_code_update();
- ret = cmd->sock->ops->recvmsg(cmd->sock, &request,
- sizeof(request), 0);
- if (ret < 0 || ret != sizeof(request)) {
- ret = -1;
- ERR("Relay didn't receive the whole packet");
+ ret = recv_request(cmd->sock, &request, sizeof(request));
+ if (ret < 0) {
goto end;
}
+ health_code_update();
rcu_read_lock();
- stream = live_find_viewer_stream_by_id(be64toh(request.stream_id));
+ stream = viewer_stream_find_by_id(be64toh(request.stream_id));
if (!stream || !stream->metadata_flag) {
ERR("Invalid metadata stream");
goto error;
}
- assert(stream->ctf_trace);
- assert(stream->ctf_trace->metadata_sent <=
- stream->ctf_trace->metadata_received);
- len = stream->ctf_trace->metadata_received -
- stream->ctf_trace->metadata_sent;
+ ctf_trace = ctf_trace_find_by_path(cmd->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(VIEWER_NO_NEW_METADATA);
goto send_reply;
goto error;
}
- read_len = read(stream->read_fd, data, len);
- if (read_len < (ssize_t) len) {
+ read_len = lttng_read(stream->read_fd, data, len);
+ if (read_len < len) {
PERROR("Relay reading metadata file");
goto error;
}
- stream->ctf_trace->metadata_sent += read_len;
+ ctf_trace->metadata_sent += read_len;
reply.status = htobe32(VIEWER_METADATA_OK);
goto send_reply;
reply.status = htobe32(VIEWER_METADATA_ERR);
send_reply:
- ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0);
+ health_code_update();
+ ret = send_response(cmd->sock, &reply, sizeof(reply));
if (ret < 0) {
- ERR("Relay data header to viewer");
goto end_unlock;
}
+ health_code_update();
if (len > 0) {
- ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0);
+ ret = send_response(cmd->sock, data, len);
if (ret < 0) {
- ERR("Relay send data to viewer");
goto end_unlock;
}
}
void live_relay_unknown_command(struct relay_command *cmd)
{
struct lttcomm_relayd_generic_reply reply;
- int ret;
reply.ret_code = htobe32(LTTNG_ERR_UNK);
- ret = cmd->sock->ops->sendmsg(cmd->sock, &reply,
- sizeof(struct lttcomm_relayd_generic_reply), 0);
- if (ret < 0) {
- ERR("Relay sending unknown command");
- }
+ (void) send_response(cmd->sock, &reply, sizeof(reply));
}
/*
struct relay_command *cmd, struct lttng_ht *sessions_ht)
{
int ret = 0;
+ uint32_t msg_value;
+
+ assert(recv_hdr);
+ assert(cmd);
+ assert(sessions_ht);
- switch (be32toh(recv_hdr->cmd)) {
+ 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 != VIEWER_CONNECT && !cmd->version_check_done) {
+ ERR("Viewer cmd value %" PRIu32 " before version check", msg_value);
+ ret = -1;
+ goto end;
+ }
+
+ switch (msg_value) {
case VIEWER_CONNECT:
ret = viewer_connect(cmd);
break;
ret = viewer_get_next_index(cmd, sessions_ht);
break;
case VIEWER_GET_PACKET:
- ret = viewer_get_packet(cmd);
+ ret = viewer_get_packet(cmd, sessions_ht);
break;
case VIEWER_GET_METADATA:
ret = viewer_get_metadata(cmd);
break;
+ case VIEWER_GET_NEW_STREAMS:
+ ret = viewer_get_new_streams(cmd, sessions_ht);
+ break;
default:
ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd));
live_relay_unknown_command(cmd);
goto error;
}
- do {
- ret = read(fd, relay_connection, sizeof(*relay_connection));
- } while (ret < 0 && errno == EINTR);
- if (ret < 0 || ret < sizeof(*relay_connection)) {
+ ret = lttng_read(fd, relay_connection, sizeof(*relay_connection));
+ if (ret < sizeof(*relay_connection)) {
PERROR("read relay cmd pipe");
goto error_read;
}
struct relay_command *relay_connection =
caa_container_of(head, struct relay_command, rcu_node);
- if (relay_connection->session &&
- relay_connection->session->viewer_attached > 0) {
- relay_connection->session->viewer_attached--;
- }
lttcomm_destroy_sock(relay_connection->sock);
free(relay_connection);
}
-static
-void deferred_free_viewer_stream(struct rcu_head *head)
-{
- struct relay_viewer_stream *stream =
- caa_container_of(head, struct relay_viewer_stream, rcu_node);
-
- if (stream->ctf_trace) {
- uatomic_dec(&stream->ctf_trace->refcount);
- assert(uatomic_read(&stream->ctf_trace->refcount) >= 0);
- if (uatomic_read(&stream->ctf_trace->refcount) == 0) {
- DBG("Freeing ctf_trace %" PRIu64, stream->ctf_trace->id);
- free(stream->ctf_trace);
- }
- }
-
- free(stream->path_name);
- free(stream->channel_name);
- free(stream);
-}
-
-static
-void viewer_del_streams(uint64_t session_id)
+/*
+ * Delete all streams for a specific session ID.
+ */
+static void destroy_viewer_streams_by_session(struct relay_session *session)
{
- int ret;
struct relay_viewer_stream *stream;
- struct lttng_ht_node_u64 *node;
struct lttng_ht_iter iter;
+ assert(session);
+
rcu_read_lock();
- cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) {
- node = lttng_ht_iter_get_node_u64(&iter);
- if (!node) {
- continue;
- }
+ cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, stream,
+ stream_n.node) {
+ struct ctf_trace *ctf_trace;
- stream = caa_container_of(node, struct relay_viewer_stream, stream_n);
- if (stream->session_id != session_id) {
+ health_code_update();
+ if (stream->session_id != session->id) {
continue;
}
- if (stream->read_fd > 0) {
- ret = close(stream->read_fd);
- if (ret < 0) {
- PERROR("close read_fd");
- }
- }
- if (stream->index_read_fd > 0) {
- ret = close(stream->index_read_fd);
- if (ret < 0) {
- PERROR("close index_read_fd");
- }
- }
- if (stream->metadata_flag && stream->ctf_trace) {
- stream->ctf_trace->metadata_sent = 0;
+ 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;
}
- ret = lttng_ht_del(viewer_streams_ht, &iter);
- assert(!ret);
- call_rcu(&stream->rcu_node, deferred_free_viewer_stream);
+
+ 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 free a connection.
*
*/
static
void del_connection(struct lttng_ht *relay_connections_ht,
- struct lttng_ht_iter *iter, struct relay_command *relay_connection)
+ struct lttng_ht_iter *iter, struct relay_command *relay_connection,
+ struct lttng_ht *sessions_ht)
{
int ret;
+ struct relay_session *session;
assert(relay_connections_ht);
assert(iter);
assert(relay_connection);
+ assert(sessions_ht);
+ DBG("Cleaning connection of session ID %" PRIu64,
+ relay_connection->session_id);
+
+ rcu_read_lock();
ret = lttng_ht_del(relay_connections_ht, iter);
assert(!ret);
- viewer_del_streams(relay_connection->session_id);
+ session = session_find_by_id(sessions_ht, relay_connection->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(sessions_ht, session);
+ }
+ rcu_read_unlock();
call_rcu(&relay_connection->rcu_node, deferred_free_connection);
}
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) {
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.
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);
+ ret = check_live_conn_pipe(pollfd, revents);
if (ret) {
err = 0;
goto exit;
if (revents & (LPOLLERR)) {
cleanup_poll_connection(&events, pollfd);
del_connection(relay_connections_ht, &iter,
- relay_connection);
+ relay_connection, relay_ctx->sessions_ht);
} else if (revents & (LPOLLHUP | LPOLLRDHUP)) {
DBG("Viewer socket %d hung up", pollfd);
cleanup_poll_connection(&events, pollfd);
del_connection(relay_connections_ht, &iter,
- relay_connection);
+ relay_connection, relay_ctx->sessions_ht);
} else if (revents & LPOLLIN) {
ret = relay_connection->sock->ops->recvmsg(
relay_connection->sock, &recv_hdr,
/* connection closed */
if (ret <= 0) {
cleanup_poll_connection(&events, pollfd);
- del_connection( relay_connections_ht, &iter,
- relay_connection);
+ del_connection(relay_connections_ht, &iter,
+ relay_connection, relay_ctx->sessions_ht);
DBG("Viewer control connection closed with %d",
pollfd);
} else {
/* Clear the session on error. */
cleanup_poll_connection(&events, pollfd);
del_connection(relay_connections_ht, &iter,
- relay_connection);
+ relay_connection, relay_ctx->sessions_ht);
DBG("Viewer connection closed with %d", pollfd);
}
}
/* empty the hash table and free the memory */
rcu_read_lock();
cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) {
+ health_code_update();
+
node = lttng_ht_iter_get_node_ulong(&iter);
if (!node) {
continue;
relay_connection = caa_container_of(node, struct relay_command,
sock_n);
- del_connection(relay_connections_ht, &iter, relay_connection);
+ del_connection(relay_connections_ht, &iter, relay_connection,
+ relay_ctx->sessions_ht);
}
rcu_read_unlock();
error_poll_create:
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;
return ret;
}
-void live_stop_threads()
+void live_stop_threads(void)
{
int ret;
void *status;
assert(uri);
live_uri = uri;
- /* Create thread quit pipe */
- if ((ret = init_thread_quit_pipe()) < 0) {
- goto error;
- }
-
/* Check if daemon is UID = 0 */
is_root = !getuid();
projects / lttng-tools.git / blobdiff