X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Factions%2Faction.c;fp=src%2Fcommon%2Factions%2Faction.c;h=cab49ae0d9596f470aeffba5237ab31379253307;hp=0000000000000000000000000000000000000000;hb=1831ae68b70dece8e9b847081526495adbbf05e5;hpb=25357057de5ae4dd2a572e8f9b893c1b90cbd60a diff --git a/src/common/actions/action.c b/src/common/actions/action.c new file mode 100644 index 000000000..cab49ae0d --- /dev/null +++ b/src/common/actions/action.c @@ -0,0 +1,254 @@ +/* + * Copyright (C) 2017 Jérémie Galarneau + * + * SPDX-License-Identifier: LGPL-2.1-only + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +LTTNG_HIDDEN +const char *lttng_action_type_string(enum lttng_action_type action_type) +{ + switch (action_type) { + case LTTNG_ACTION_TYPE_UNKNOWN: + return "UNKNOWN"; + + case LTTNG_ACTION_TYPE_GROUP: + return "GROUP"; + + case LTTNG_ACTION_TYPE_NOTIFY: + return "NOTIFY"; + + case LTTNG_ACTION_TYPE_ROTATE_SESSION: + return "ROTATE_SESSION"; + + case LTTNG_ACTION_TYPE_SNAPSHOT_SESSION: + return "SNAPSHOT_SESSION"; + + case LTTNG_ACTION_TYPE_START_SESSION: + return "START_SESSION"; + + case LTTNG_ACTION_TYPE_STOP_SESSION: + return "STOP_SESSION"; + + default: + return "???"; + } +} + +enum lttng_action_type lttng_action_get_type(const struct lttng_action *action) +{ + return action ? action->type : LTTNG_ACTION_TYPE_UNKNOWN; +} + +LTTNG_HIDDEN +enum lttng_action_type lttng_action_get_type_const( + const struct lttng_action *action) +{ + return action->type; +} + +LTTNG_HIDDEN +void lttng_action_init( + struct lttng_action *action, + enum lttng_action_type type, + action_validate_cb validate, + action_serialize_cb serialize, + action_equal_cb equal, + action_destroy_cb destroy) +{ + urcu_ref_init(&action->ref); + action->type = type; + action->validate = validate; + action->serialize = serialize; + action->equal = equal; + action->destroy = destroy; +} + +static +void action_destroy_ref(struct urcu_ref *ref) +{ + struct lttng_action *action = + container_of(ref, struct lttng_action, ref); + + action->destroy(action); +} + +LTTNG_HIDDEN +void lttng_action_get(struct lttng_action *action) +{ + urcu_ref_get(&action->ref); +} + +LTTNG_HIDDEN +void lttng_action_put(struct lttng_action *action) +{ + if (!action) { + return; + } + + assert(action->destroy); + urcu_ref_put(&action->ref, action_destroy_ref); +} + +void lttng_action_destroy(struct lttng_action *action) +{ + lttng_action_put(action); +} + +LTTNG_HIDDEN +bool lttng_action_validate(struct lttng_action *action) +{ + bool valid; + + if (!action) { + valid = false; + goto end; + } + + if (!action->validate) { + /* Sub-class guarantees that it can never be invalid. */ + valid = true; + goto end; + } + + valid = action->validate(action); +end: + return valid; +} + +LTTNG_HIDDEN +int lttng_action_serialize(struct lttng_action *action, + struct lttng_dynamic_buffer *buf) +{ + int ret; + struct lttng_action_comm action_comm = { + .action_type = (int8_t) action->type, + }; + + ret = lttng_dynamic_buffer_append(buf, &action_comm, + sizeof(action_comm)); + if (ret) { + goto end; + } + + ret = action->serialize(action, buf); + if (ret) { + goto end; + } +end: + return ret; +} + +LTTNG_HIDDEN +ssize_t lttng_action_create_from_buffer(const struct lttng_buffer_view *view, + struct lttng_action **action) +{ + ssize_t consumed_len, specific_action_consumed_len; + const struct lttng_action_comm *action_comm; + action_create_from_buffer_cb create_from_buffer_cb; + struct lttng_buffer_view specific_action_view; + + if (!view || !action) { + consumed_len = -1; + goto end; + } + + action_comm = (const struct lttng_action_comm *) view->data; + + DBG("Create action from buffer: action-type=%s", + lttng_action_type_string(action_comm->action_type)); + + switch (action_comm->action_type) { + case LTTNG_ACTION_TYPE_NOTIFY: + create_from_buffer_cb = lttng_action_notify_create_from_buffer; + break; + + case LTTNG_ACTION_TYPE_ROTATE_SESSION: + create_from_buffer_cb = + lttng_action_rotate_session_create_from_buffer; + break; + + case LTTNG_ACTION_TYPE_SNAPSHOT_SESSION: + create_from_buffer_cb = + lttng_action_snapshot_session_create_from_buffer; + break; + + case LTTNG_ACTION_TYPE_START_SESSION: + create_from_buffer_cb = + lttng_action_start_session_create_from_buffer; + break; + + case LTTNG_ACTION_TYPE_STOP_SESSION: + create_from_buffer_cb = + lttng_action_stop_session_create_from_buffer; + break; + + case LTTNG_ACTION_TYPE_GROUP: + create_from_buffer_cb = lttng_action_group_create_from_buffer; + break; + + default: + ERR("Failed to create action from buffer, unhandled action type: action-type=%u (%s)", + action_comm->action_type, + lttng_action_type_string( + action_comm->action_type)); + consumed_len = -1; + goto end; + } + + /* Create buffer view for the action-type-specific data. */ + specific_action_view = lttng_buffer_view_from_view(view, + sizeof(struct lttng_action_comm), + view->size - sizeof(struct lttng_action_comm)); + + specific_action_consumed_len = + create_from_buffer_cb(&specific_action_view, action); + if (specific_action_consumed_len < 0) { + ERR("Failed to create specific action from buffer."); + consumed_len = -1; + goto end; + } + + assert(*action); + + consumed_len = sizeof(struct lttng_action_comm) + + specific_action_consumed_len; + +end: + return consumed_len; +} + +LTTNG_HIDDEN +bool lttng_action_is_equal(const struct lttng_action *a, + const struct lttng_action *b) +{ + bool is_equal = false; + + if (!a || !b) { + goto end; + } + + if (a->type != b->type) { + goto end; + } + + if (a == b) { + is_equal = true; + goto end; + } + + is_equal = a->equal ? a->equal(a, b) : true; +end: + return is_equal; +} +