X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-relayd%2Fsession.c;h=0a535cf877b581945260266f117cab69071f751d;hb=HEAD;hp=827746430712e098d028f8a8105ab881cdf336ed;hpb=874ec45eeb8fffb9304ffc796603537deeff29e7;p=lttng-tools.git diff --git a/src/bin/lttng-relayd/session.c b/src/bin/lttng-relayd/session.c deleted file mode 100644 index 827746430..000000000 --- a/src/bin/lttng-relayd/session.c +++ /dev/null @@ -1,508 +0,0 @@ -/* - * Copyright (C) 2013 - Julien Desfossez - * David Goulet - * 2015 - Mathieu Desnoyers - * - * 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 _LGPL_SOURCE -#include -#include -#include -#include - -#include - -#include "ctf-trace.h" -#include "lttng-relayd.h" -#include "session.h" -#include "sessiond-trace-chunks.h" -#include "stream.h" -#include -#include "utils.h" - -/* Global session id used in the session creation. */ -static uint64_t last_relay_session_id; -static pthread_mutex_t last_relay_session_id_lock = PTHREAD_MUTEX_INITIALIZER; - -static int init_session_output_path(struct relay_session *session) -{ - /* - * session_directory: - * - * if base_path is \0' - * hostname/session_name - * else - * hostname/base_path - */ - char *session_directory = NULL; - int ret = 0; - - if (session->output_path[0] != '\0') { - goto end; - } - /* - * If base path is set, it overrides the session name for the - * session relative base path. No timestamp is appended if the - * base path is overridden. - * - * If the session name already contains the creation time (e.g. - * auto-, don't append yet another timestamp after - * the session name in the generated path. - * - * Otherwise, generate the path with session_name-. - */ - if (session->base_path[0] != '\0') { - ret = asprintf(&session_directory, "%s/%s", session->hostname, - session->base_path); - } else if (session->session_name_contains_creation_time) { - ret = asprintf(&session_directory, "%s/%s", session->hostname, - session->session_name); - } else { - char session_creation_datetime[16]; - size_t strftime_ret; - struct tm *timeinfo; - time_t creation_time; - - /* - * The 2.11+ protocol guarantees that a creation time - * is provided for a session. This would indicate a - * protocol error or an improper use of this util. - */ - if (!session->creation_time.is_set) { - ERR("Creation time missing for session \"%s\" (protocol error)", - session->session_name); - ret = -1; - goto end; - } - creation_time = LTTNG_OPTIONAL_GET(session->creation_time); - - timeinfo = localtime(&creation_time); - if (!timeinfo) { - ERR("Failed to get timeinfo while initializing session output directory handle"); - ret = -1; - goto end; - } - strftime_ret = strftime(session_creation_datetime, - sizeof(session_creation_datetime), - "%Y%m%d-%H%M%S", timeinfo); - if (strftime_ret == 0) { - ERR("Failed to format session creation timestamp while initializing session output directory handle"); - ret = -1; - goto end; - } - ret = asprintf(&session_directory, "%s/%s-%s", - session->hostname, session->session_name, - session_creation_datetime); - } - if (ret < 0) { - PERROR("Failed to format session directory name"); - goto end; - } - - if (strlen(session_directory) >= LTTNG_PATH_MAX) { - ERR("Session output directory exceeds maximal length"); - ret = -1; - goto end; - } - strcpy(session->output_path, session_directory); - ret = 0; - -end: - free(session_directory); - return ret; -} - -static int session_set_anonymous_chunk(struct relay_session *session) -{ - int ret = 0; - struct lttng_trace_chunk *chunk = NULL; - enum lttng_trace_chunk_status status; - struct lttng_directory_handle output_directory; - - ret = session_init_output_directory_handle(session, &output_directory); - if (ret) { - goto end; - } - - chunk = lttng_trace_chunk_create_anonymous(); - if (!chunk) { - goto end; - } - - status = lttng_trace_chunk_set_credentials_current_user(chunk); - if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { - ret = -1; - goto end; - } - - status = lttng_trace_chunk_set_as_owner(chunk, &output_directory); - if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { - ret = -1; - goto end; - } - session->current_trace_chunk = chunk; - chunk = NULL; -end: - lttng_trace_chunk_put(chunk); - lttng_directory_handle_fini(&output_directory); - return ret; -} - -/* - * Create a new session by assigning a new session ID. - * - * Return allocated session or else NULL. - */ -struct relay_session *session_create(const char *session_name, - const char *hostname, const char *base_path, - uint32_t live_timer, - bool snapshot, - const lttng_uuid sessiond_uuid, - const uint64_t *id_sessiond, - const uint64_t *current_chunk_id, - const time_t *creation_time, - uint32_t major, - uint32_t minor, - bool session_name_contains_creation_time) -{ - int ret; - struct relay_session *session = NULL; - - if (session_name && strstr(session_name, ".")) { - ERR("Illegal character in session name: \"%s\"", - session_name); - goto error; - } - if (base_path && strstr(base_path, "../")) { - ERR("Invalid session base path walks up the path hierarchy: \"%s\"", - base_path); - goto error; - } - if (hostname && strstr(hostname, ".")) { - ERR("Invalid character in hostname: \"%s\"", - hostname); - goto error; - } - - session = zmalloc(sizeof(*session)); - if (!session) { - PERROR("Failed to allocate session"); - goto error; - } - if (lttng_strncpy(session->session_name, session_name, - sizeof(session->session_name))) { - WARN("Session name exceeds maximal allowed length"); - goto error; - } - if (lttng_strncpy(session->hostname, hostname, - sizeof(session->hostname))) { - WARN("Hostname exceeds maximal allowed length"); - goto error; - } - if (lttng_strncpy(session->base_path, base_path, - sizeof(session->base_path))) { - WARN("Base path exceeds maximal allowed length"); - goto error; - } - if (creation_time) { - LTTNG_OPTIONAL_SET(&session->creation_time, *creation_time); - } - session->session_name_contains_creation_time = - session_name_contains_creation_time; - - session->ctf_traces_ht = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); - if (!session->ctf_traces_ht) { - goto error; - } - - pthread_mutex_lock(&last_relay_session_id_lock); - session->id = ++last_relay_session_id; - pthread_mutex_unlock(&last_relay_session_id_lock); - - session->major = major; - session->minor = minor; - lttng_ht_node_init_u64(&session->session_n, session->id); - urcu_ref_init(&session->ref); - CDS_INIT_LIST_HEAD(&session->recv_list); - pthread_mutex_init(&session->lock, NULL); - pthread_mutex_init(&session->recv_list_lock, NULL); - - session->live_timer = live_timer; - session->snapshot = snapshot; - lttng_uuid_copy(session->sessiond_uuid, sessiond_uuid); - - if (id_sessiond) { - LTTNG_OPTIONAL_SET(&session->id_sessiond, *id_sessiond); - } - - if (major == 2 && minor >= 11) { - /* Only applies for 2.11+ peers using trace chunks. */ - ret = init_session_output_path(session); - if (ret) { - goto error; - } - } - - ret = sessiond_trace_chunk_registry_session_created( - sessiond_trace_chunk_registry, sessiond_uuid); - if (ret) { - goto error; - } - - if (id_sessiond && current_chunk_id) { - session->current_trace_chunk = - sessiond_trace_chunk_registry_get_chunk( - sessiond_trace_chunk_registry, - session->sessiond_uuid, - session->id_sessiond.value, - *current_chunk_id); - if (!session->current_trace_chunk) { - char uuid_str[UUID_STR_LEN]; - - lttng_uuid_to_str(sessiond_uuid, uuid_str); - ERR("Could not find trace chunk: sessiond = {%s}, sessiond session id = %" PRIu64 ", trace chunk id = %" PRIu64, - uuid_str, *id_sessiond, - *current_chunk_id); - } - } else if (!id_sessiond) { - /* - * Pre-2.11 peers will not announce trace chunks. An - * anonymous trace chunk which will remain set for the - * duration of the session is created. - */ - ret = session_set_anonymous_chunk(session); - if (ret) { - goto error; - } - } - - lttng_ht_add_unique_u64(sessions_ht, &session->session_n); - return session; - -error: - session_put(session); - return NULL; -} - -/* Should be called with RCU read-side lock held. */ -bool session_get(struct relay_session *session) -{ - return urcu_ref_get_unless_zero(&session->ref); -} - -/* - * Lookup a session within the session hash table using the session id - * as key. A session reference is taken when a session is returned. - * session_put() must be called on that session. - * - * Return session or NULL if not found. - */ -struct relay_session *session_get_by_id(uint64_t id) -{ - struct relay_session *session = NULL; - struct lttng_ht_node_u64 *node; - struct lttng_ht_iter iter; - - rcu_read_lock(); - lttng_ht_lookup(sessions_ht, &id, &iter); - node = lttng_ht_iter_get_node_u64(&iter); - if (!node) { - DBG("Session find by ID %" PRIu64 " id NOT found", id); - goto end; - } - session = caa_container_of(node, struct relay_session, session_n); - DBG("Session find by ID %" PRIu64 " id found", id); - if (!session_get(session)) { - session = NULL; - } -end: - rcu_read_unlock(); - return session; -} - -static void rcu_destroy_session(struct rcu_head *rcu_head) -{ - struct relay_session *session = - caa_container_of(rcu_head, struct relay_session, - rcu_node); - /* - * Since each trace has a reference on the session, it means - * that if we are at the point where we teardown the session, no - * trace belonging to that session exist at this point. - * Calling lttng_ht_destroy in call_rcu worker thread so we - * don't hold the RCU read-side lock while calling it. - */ - lttng_ht_destroy(session->ctf_traces_ht); - free(session); -} - -/* - * Delete session from the given hash table. - * - * Return lttng ht del error code being 0 on success and 1 on failure. - */ -static int session_delete(struct relay_session *session) -{ - struct lttng_ht_iter iter; - - iter.iter.node = &session->session_n.node; - return lttng_ht_del(sessions_ht, &iter); -} - - -static void destroy_session(struct relay_session *session) -{ - int ret; - - ret = session_delete(session); - assert(!ret); - lttng_trace_chunk_put(session->current_trace_chunk); - session->current_trace_chunk = NULL; - lttng_trace_chunk_put(session->pending_closure_trace_chunk); - session->pending_closure_trace_chunk = NULL; - ret = sessiond_trace_chunk_registry_session_destroyed( - sessiond_trace_chunk_registry, session->sessiond_uuid); - assert(!ret); - call_rcu(&session->rcu_node, rcu_destroy_session); -} - -void session_release(struct urcu_ref *ref) -{ - struct relay_session *session = - caa_container_of(ref, struct relay_session, ref); - - destroy_session(session); -} - -void session_put(struct relay_session *session) -{ - if (!session) { - return; - } - rcu_read_lock(); - urcu_ref_put(&session->ref, session_release); - rcu_read_unlock(); -} - -int session_close(struct relay_session *session) -{ - int ret = 0; - struct ctf_trace *trace; - struct lttng_ht_iter iter; - struct relay_stream *stream; - - pthread_mutex_lock(&session->lock); - DBG("closing session %" PRIu64 ": is conn already closed %d", - session->id, session->connection_closed); - session->connection_closed = true; - pthread_mutex_unlock(&session->lock); - - rcu_read_lock(); - cds_lfht_for_each_entry(session->ctf_traces_ht->ht, - &iter.iter, trace, node.node) { - ret = ctf_trace_close(trace); - if (ret) { - goto rcu_unlock; - } - } - cds_list_for_each_entry_rcu(stream, &session->recv_list, - recv_node) { - /* Close streams which have not been published yet. */ - try_stream_close(stream); - } -rcu_unlock: - rcu_read_unlock(); - if (ret) { - return ret; - } - /* Put self-reference from create. */ - session_put(session); - return ret; -} - -int session_abort(struct relay_session *session) -{ - int ret = 0; - - if (!session) { - return 0; - } - - pthread_mutex_lock(&session->lock); - DBG("aborting session %" PRIu64, session->id); - session->aborted = true; - pthread_mutex_unlock(&session->lock); - return ret; -} - -void print_sessions(void) -{ - struct lttng_ht_iter iter; - struct relay_session *session; - - if (!sessions_ht) { - return; - } - - rcu_read_lock(); - cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, - session_n.node) { - if (!session_get(session)) { - continue; - } - DBG("session %p refcount %ld session %" PRIu64, - session, - session->ref.refcount, - session->id); - session_put(session); - } - rcu_read_unlock(); -} - -int session_init_output_directory_handle(struct relay_session *session, - struct lttng_directory_handle *handle) -{ - int ret; - /* - * relayd_output_path/session_directory - * e.g. /home/user/lttng-traces/hostname/session_name - */ - char *full_session_path = NULL; - - pthread_mutex_lock(&session->lock); - full_session_path = create_output_path(session->output_path); - if (!full_session_path) { - ret = -1; - goto end; - } - - ret = utils_mkdir_recursive( - full_session_path, S_IRWXU | S_IRWXG, -1, -1); - if (ret) { - ERR("Failed to create session output path \"%s\"", - full_session_path); - goto end; - } - - ret = lttng_directory_handle_init(handle, full_session_path); - if (ret) { - goto end; - } -end: - pthread_mutex_unlock(&session->lock); - free(full_session_path); - return ret; -}