lttng: enable-event: treat 'all' case as a regular pattern
authorJérémie Galarneau <jeremie.galarneau@efficios.com>
Mon, 26 Feb 2024 20:56:27 +0000 (15:56 -0500)
committerJérémie Galarneau <jeremie.galarneau@efficios.com>
Wed, 28 Feb 2024 15:41:08 +0000 (10:41 -0500)
The cmd_enable_events function is essentially duplicated to handle the
"all events" case, but it simply substitutes the event name for '*'.

The case can be eliminated if we simply add '*' as one of the patterns
to enable when the '--all' option is used.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: If4235c391c2ce38a67208184c97bbe0f5c40c97d

src/bin/lttng/commands/enable_events.cpp

index 78cc0ea8b88f6ef8d31723312248fd7cefb0d1be..c0d9e0166df0e4366687a4765bb167a567ab2e42 100644 (file)
@@ -512,292 +512,6 @@ int enable_events(const std::string& session_name, const event_rule_patterns& pa
                }
        }
 
-       if (opt_enable_all) {
-               /* Default setup for enable all */
-               if (opt_kernel) {
-                       ev->type = (lttng_event_type) opt_event_type;
-                       strcpy(ev->name, "*");
-                       /* kernel loglevels not implemented */
-                       ev->loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
-               } else {
-                       ev->type = LTTNG_EVENT_TRACEPOINT;
-                       strcpy(ev->name, "*");
-                       ev->loglevel_type = (lttng_loglevel_type) opt_loglevel_type;
-                       if (opt_loglevel) {
-                               int name_search_ret;
-
-                               LTTNG_ASSERT(opt_userspace || opt_jul || opt_log4j || opt_python);
-
-                               if (opt_userspace) {
-                                       enum lttng_loglevel loglevel;
-
-                                       name_search_ret =
-                                               loglevel_name_to_value(opt_loglevel, &loglevel);
-                                       ev->loglevel = (int) loglevel;
-                               } else if (opt_jul) {
-                                       enum lttng_loglevel_jul loglevel;
-
-                                       name_search_ret =
-                                               loglevel_jul_name_to_value(opt_loglevel, &loglevel);
-                                       ev->loglevel = (int) loglevel;
-                               } else if (opt_log4j) {
-                                       enum lttng_loglevel_log4j loglevel;
-
-                                       name_search_ret = loglevel_log4j_name_to_value(opt_loglevel,
-                                                                                      &loglevel);
-                                       ev->loglevel = (int) loglevel;
-                               } else {
-                                       /* python domain. */
-                                       enum lttng_loglevel_python loglevel;
-
-                                       name_search_ret = loglevel_python_name_to_value(
-                                               opt_loglevel, &loglevel);
-                                       ev->loglevel = (int) loglevel;
-                               }
-
-                               if (name_search_ret == -1) {
-                                       ERR("Unknown loglevel %s", opt_loglevel);
-                                       ret = -LTTNG_ERR_INVALID;
-                                       goto error;
-                               }
-                       } else {
-                               LTTNG_ASSERT(opt_userspace || opt_jul || opt_log4j || opt_python);
-                               if (opt_userspace) {
-                                       ev->loglevel = -1;
-                               } else if (opt_jul) {
-                                       ev->loglevel = LTTNG_LOGLEVEL_JUL_ALL;
-                               } else if (opt_log4j) {
-                                       ev->loglevel = LTTNG_LOGLEVEL_LOG4J_ALL;
-                               } else if (opt_python) {
-                                       ev->loglevel = LTTNG_LOGLEVEL_PYTHON_DEBUG;
-                               }
-                       }
-               }
-
-               if (opt_exclude) {
-                       ret = create_exclusion_list_and_validate("*", opt_exclude, &exclusions);
-                       if (ret) {
-                               ret = CMD_ERROR;
-                               goto error;
-                       }
-
-                       ev->exclusion = 1;
-                       warn_on_truncated_exclusion_names(&exclusions, &warn);
-               }
-               if (!opt_filter) {
-                       ret = lttng_enable_event_with_exclusions(
-                               handle,
-                               ev,
-                               channel_name,
-                               nullptr,
-                               lttng_dynamic_pointer_array_get_count(&exclusions),
-                               (char **) exclusions.array.buffer.data);
-                       if (ret < 0) {
-                               switch (-ret) {
-                               case LTTNG_ERR_KERN_EVENT_EXIST:
-                                       WARN("Kernel events already enabled (channel %s, session %s)",
-                                            print_channel_name(channel_name),
-                                            session_name.c_str());
-                                       warn = 1;
-                                       break;
-                               case LTTNG_ERR_TRACE_ALREADY_STARTED:
-                               {
-                                       const char *msg =
-                                               "The command tried to enable an event in a new domain for a session that has already been started once.";
-                                       ERR("Events: %s (channel %s, session %s)",
-                                           msg,
-                                           print_channel_name(channel_name),
-                                           session_name.c_str());
-                                       error = 1;
-                                       break;
-                               }
-                               default:
-                                       ERR("Events: %s (channel %s, session %s)",
-                                           lttng_strerror(ret),
-                                           ret == -LTTNG_ERR_NEED_CHANNEL_NAME ?
-                                                   print_raw_channel_name(channel_name) :
-                                                   print_channel_name(channel_name),
-                                           session_name.c_str());
-                                       error = 1;
-                                       break;
-                               }
-                               goto end;
-                       }
-
-                       switch (opt_event_type) {
-                       case LTTNG_EVENT_TRACEPOINT:
-                               if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
-                                       char *exclusion_string = print_exclusions(&exclusions);
-
-                                       if (!exclusion_string) {
-                                               PERROR("Cannot allocate exclusion_string");
-                                               error = 1;
-                                               goto end;
-                                       }
-                                       MSG("All %s tracepoints%s are enabled in channel %s for loglevel %s",
-                                           lttng_domain_type_str(dom.type),
-                                           exclusion_string,
-                                           print_channel_name(channel_name),
-                                           opt_loglevel);
-                                       free(exclusion_string);
-                               } else {
-                                       char *exclusion_string = print_exclusions(&exclusions);
-
-                                       if (!exclusion_string) {
-                                               PERROR("Cannot allocate exclusion_string");
-                                               error = 1;
-                                               goto end;
-                                       }
-                                       MSG("All %s tracepoints%s are enabled in channel %s",
-                                           lttng_domain_type_str(dom.type),
-                                           exclusion_string,
-                                           print_channel_name(channel_name));
-                                       free(exclusion_string);
-                               }
-                               break;
-                       case LTTNG_EVENT_SYSCALL:
-                               if (opt_kernel) {
-                                       MSG("All %s system calls are enabled in channel %s",
-                                           lttng_domain_type_str(dom.type),
-                                           print_channel_name(channel_name));
-                               }
-                               break;
-                       case LTTNG_EVENT_ALL:
-                               if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
-                                       char *exclusion_string = print_exclusions(&exclusions);
-
-                                       if (!exclusion_string) {
-                                               PERROR("Cannot allocate exclusion_string");
-                                               error = 1;
-                                               goto end;
-                                       }
-                                       MSG("All %s events%s are enabled in channel %s for loglevel %s",
-                                           lttng_domain_type_str(dom.type),
-                                           exclusion_string,
-                                           print_channel_name(channel_name),
-                                           opt_loglevel);
-                                       free(exclusion_string);
-                               } else {
-                                       char *exclusion_string = print_exclusions(&exclusions);
-
-                                       if (!exclusion_string) {
-                                               PERROR("Cannot allocate exclusion_string");
-                                               error = 1;
-                                               goto end;
-                                       }
-                                       MSG("All %s events%s are enabled in channel %s",
-                                           lttng_domain_type_str(dom.type),
-                                           exclusion_string,
-                                           print_channel_name(channel_name));
-                                       free(exclusion_string);
-                               }
-                               break;
-                       default:
-                               /*
-                                * We should not be here since lttng_enable_event should have
-                                * failed on the event type.
-                                */
-                               goto error;
-                       }
-               }
-
-               if (opt_filter) {
-                       command_ret = lttng_enable_event_with_exclusions(
-                               handle,
-                               ev,
-                               channel_name,
-                               opt_filter,
-                               lttng_dynamic_pointer_array_get_count(&exclusions),
-                               (char **) exclusions.array.buffer.data);
-                       if (command_ret < 0) {
-                               switch (-command_ret) {
-                               case LTTNG_ERR_FILTER_EXIST:
-                                       WARN("Filter on all events is already enabled"
-                                            " (channel %s, session %s)",
-                                            print_channel_name(channel_name),
-                                            session_name.c_str());
-                                       warn = 1;
-                                       break;
-                               case LTTNG_ERR_TRACE_ALREADY_STARTED:
-                               {
-                                       const char *msg =
-                                               "The command tried to enable an event in a new domain for a session that has already been started once.";
-                                       ERR("All events: %s (channel %s, session %s, filter \'%s\')",
-                                           msg,
-                                           print_channel_name(channel_name),
-                                           session_name.c_str(),
-                                           opt_filter);
-                                       error = 1;
-                                       break;
-                               }
-                               default:
-                                       ERR("All events: %s (channel %s, session %s, filter \'%s\')",
-                                           lttng_strerror(command_ret),
-                                           command_ret == -LTTNG_ERR_NEED_CHANNEL_NAME ?
-                                                   print_raw_channel_name(channel_name) :
-                                                   print_channel_name(channel_name),
-                                           session_name.c_str(),
-                                           opt_filter);
-                                       error = 1;
-                                       break;
-                               }
-                               error_holder = command_ret;
-                       } else {
-                               ev->filter = 1;
-                               MSG("Filter '%s' successfully set", opt_filter);
-                       }
-               }
-
-               if (lttng_opt_mi) {
-                       /* The wildcard * is used for kernel and ust domain to
-                        * represent ALL. We copy * in event name to force the wildcard use
-                        * for kernel domain
-                        *
-                        * Note: this is strictly for semantic and printing while in
-                        * machine interface mode.
-                        */
-                       strcpy(ev->name, "*");
-
-                       /* If we reach here the events are enabled */
-                       if (!error && !warn) {
-                               ev->enabled = 1;
-                       } else {
-                               ev->enabled = 0;
-                               success = 0;
-                       }
-                       ret = mi_lttng_event(writer.get(), ev, 1, handle->domain.type);
-                       if (ret) {
-                               ret = CMD_ERROR;
-                               goto error;
-                       }
-
-                       /* print exclusion */
-                       ret = mi_print_exclusion(&exclusions);
-                       if (ret) {
-                               ret = CMD_ERROR;
-                               goto error;
-                       }
-
-                       /* Success ? */
-                       ret = mi_lttng_writer_write_element_bool(
-                               writer.get(), mi_lttng_element_command_success, success);
-                       if (ret) {
-                               ret = CMD_ERROR;
-                               goto error;
-                       }
-
-                       /* Close event element */
-                       ret = mi_lttng_writer_close_element(writer.get());
-                       if (ret) {
-                               ret = CMD_ERROR;
-                               goto error;
-                       }
-               }
-
-               goto end;
-       }
-
-       /* Strip event list */
        for (const auto& pattern : patterns) {
                /* Copy name and type of the event */
                strncpy(ev->name, pattern.c_str(), LTTNG_SYMBOL_NAME_LEN);
@@ -1283,7 +997,6 @@ int cmd_enable_events(int argc, const char **argv)
        const char *leftover = nullptr;
        int event_type = -1;
        event_rule_patterns patterns;
-       std::stringstream event_list_arg_stream(arg_event_list);
 
        auto pc = lttng::make_unique_wrapper<poptContext_s, _poptContextFree_deleter_func>(
                poptGetContext(nullptr, argc, argv, long_options, 0));
@@ -1410,8 +1123,14 @@ int cmd_enable_events(int argc, const char **argv)
                return CMD_ERROR;
        }
 
-       for (std::string line; std::getline(event_list_arg_stream, line, ',');) {
-               patterns.emplace_back(std::move(line));
+       if (opt_enable_all) {
+               patterns.emplace_back("*");
+       } else {
+               std::stringstream event_list_arg_stream(arg_event_list);
+
+               for (std::string line; std::getline(event_list_arg_stream, line, ',');) {
+                       patterns.emplace_back(std::move(line));
+               }
        }
 
        leftover = poptGetArg(pc.get());
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