--- /dev/null
+/*
+ * Copyright (C) 2019 EfficiOS, Inc.
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License, version 2.1 only,
+ * as published by the Free Software Foundation.
+ *
+ * This library 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 Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <assert.h>
+#include <common/error.h>
+#include <common/macros.h>
+#include <common/snapshot.h>
+#include <lttng/action/action-internal.h>
+#include <lttng/action/snapshot-session-internal.h>
+#include <lttng/action/snapshot-session.h>
+#include <lttng/snapshot.h>
+#include <lttng/snapshot-internal.h>
+#include <inttypes.h>
+
+struct lttng_action_snapshot_session {
+ struct lttng_action parent;
+
+ /* Owned by this. */
+ char *session_name;
+
+ /*
+ * When non-NULL, use this custom output when taking the snapshot,
+ * rather than the session's registered snapshot output.
+ *
+ * Owned by this.
+ */
+ struct lttng_snapshot_output *output;
+};
+
+struct lttng_action_snapshot_session_comm {
+ /* All string lengths include the trailing \0. */
+ uint32_t session_name_len;
+ uint32_t snapshot_output_len;
+
+ /*
+ * Variable data (all strings are null-terminated):
+ *
+ * - session name string
+ * - snapshot output object
+ *
+ */
+ char data[];
+} LTTNG_PACKED;
+
+static struct lttng_action_snapshot_session *
+action_snapshot_session_from_action(struct lttng_action *action)
+{
+ assert(action);
+
+ return container_of(
+ action, struct lttng_action_snapshot_session, parent);
+}
+
+static const struct lttng_action_snapshot_session *
+action_snapshot_session_from_action_const(const struct lttng_action *action)
+{
+ assert(action);
+
+ return container_of(
+ action, struct lttng_action_snapshot_session, parent);
+}
+
+static bool lttng_action_snapshot_session_validate(struct lttng_action *action)
+{
+ bool valid = false;
+ struct lttng_action_snapshot_session *action_snapshot_session;
+
+ if (!action) {
+ goto end;
+ }
+
+ action_snapshot_session = action_snapshot_session_from_action(action);
+
+ /* A non-empty session name is mandatory. */
+ if (!action_snapshot_session->session_name ||
+ strlen(action_snapshot_session->session_name) == 0) {
+ goto end;
+ }
+
+ if (action_snapshot_session->output &&
+ !lttng_snapshot_output_validate(action_snapshot_session->output)) {
+ goto end;
+ }
+
+ valid = true;
+end:
+ return valid;
+}
+
+static bool lttng_action_snapshot_session_is_equal(const struct lttng_action *_a, const struct lttng_action *_b)
+{
+ bool is_equal = false;
+ const struct lttng_action_snapshot_session *a, *b;
+
+ a = action_snapshot_session_from_action_const(_a);
+ b = action_snapshot_session_from_action_const(_b);
+
+ /* Action is not valid if this is not true. */
+ assert(a->session_name);
+ assert(b->session_name);
+ if (strcmp(a->session_name, b->session_name)) {
+ goto end;
+ }
+
+ if (a->output && b->output &&
+ !lttng_snapshot_output_is_equal(a->output, b->output)) {
+ goto end;
+ } else if (!!a->output != !!b->output) {
+ goto end;
+ }
+
+ is_equal = true;
+end:
+ return is_equal;
+}
+
+static size_t serialize_strlen(const char *s)
+{
+
+ size_t len = 0;
+
+ if (s) {
+ len = strlen(s) + 1;
+ }
+
+ return len;
+}
+
+static int lttng_action_snapshot_session_serialize(
+ struct lttng_action *action, struct lttng_dynamic_buffer *buf)
+{
+ struct lttng_action_snapshot_session *action_snapshot_session;
+ struct lttng_action_snapshot_session_comm comm;
+ struct lttng_dynamic_buffer snapshot_output_buf = { 0 };
+ int ret;
+
+ assert(action);
+ assert(buf);
+
+ lttng_dynamic_buffer_init(&snapshot_output_buf);
+
+ action_snapshot_session = action_snapshot_session_from_action(action);
+
+ assert(action_snapshot_session->session_name);
+ DBG("Serializing snapshot session action: session-name: %s",
+ action_snapshot_session->session_name);
+
+ /* Serialize the snapshot output object first, so we know its length. */
+ if (action_snapshot_session->output) {
+ ret = lttng_snapshot_output_serialize(
+ action_snapshot_session->output, &snapshot_output_buf);
+ if (ret) {
+ goto end;
+ }
+ }
+
+ comm.session_name_len =
+ serialize_strlen(action_snapshot_session->session_name);
+ comm.snapshot_output_len = snapshot_output_buf.size;
+
+ ret = lttng_dynamic_buffer_append(buf, &comm, sizeof(comm));
+ if (ret) {
+ goto end;
+ }
+
+ ret = lttng_dynamic_buffer_append(buf,
+ action_snapshot_session->session_name,
+ comm.session_name_len);
+ if (ret) {
+ goto end;
+ }
+
+ ret = lttng_dynamic_buffer_append_buffer(buf, &snapshot_output_buf);
+ if (ret) {
+ goto end;
+ }
+
+end:
+ lttng_dynamic_buffer_reset(&snapshot_output_buf);
+ return ret;
+}
+
+static void lttng_action_snapshot_session_destroy(struct lttng_action *action)
+{
+ struct lttng_action_snapshot_session *action_snapshot_session;
+
+ if (!action) {
+ goto end;
+ }
+
+ action_snapshot_session = action_snapshot_session_from_action(action);
+
+ free(action_snapshot_session->session_name);
+ lttng_snapshot_output_destroy(action_snapshot_session->output);
+ free(action_snapshot_session);
+
+end:
+ return;
+}
+
+ssize_t lttng_action_snapshot_session_create_from_buffer(
+ const struct lttng_buffer_view *view,
+ struct lttng_action **p_action)
+{
+ ssize_t consumed_len;
+ struct lttng_action_snapshot_session_comm *comm;
+ const char *variable_data;
+ struct lttng_action *action;
+ enum lttng_action_status status;
+ struct lttng_snapshot_output *snapshot_output = NULL;
+
+ action = lttng_action_snapshot_session_create();
+ if (!action) {
+ goto error;
+ }
+
+ comm = (struct lttng_action_snapshot_session_comm *) view->data;
+ variable_data = (const char *) &comm->data;
+
+ consumed_len = sizeof(struct lttng_action_snapshot_session_comm);
+
+ if (!lttng_buffer_view_validate_string(
+ view, variable_data, comm->session_name_len)) {
+ goto error;
+ }
+
+ status = lttng_action_snapshot_session_set_session_name(
+ action, variable_data);
+ if (status != LTTNG_ACTION_STATUS_OK) {
+ goto error;
+ }
+
+ variable_data += comm->session_name_len;
+ consumed_len += comm->session_name_len;
+
+ /* If there is a snapshot output object, deserialize it. */
+ if (comm->snapshot_output_len > 0) {
+ ssize_t snapshot_output_consumed_len;
+ enum lttng_action_status action_status;
+ struct lttng_buffer_view snapshot_output_buffer_view =
+ lttng_buffer_view_from_view(view, consumed_len,
+ comm->snapshot_output_len);
+ if (!snapshot_output_buffer_view.data) {
+ fprintf(stderr, "Failed to create buffer view for snapshot output.\n");
+ goto error;
+ }
+
+ snapshot_output_consumed_len =
+ lttng_snapshot_output_create_from_buffer(
+ &snapshot_output_buffer_view, &snapshot_output);
+ if (snapshot_output_consumed_len != comm->snapshot_output_len) {
+ fprintf(stderr, "Failed to deserialize snapshot output object: "
+ "consumed-len: %zd, expected-len: %" PRIu32,
+ snapshot_output_consumed_len,
+ comm->snapshot_output_len);
+ goto error;
+ }
+
+ action_status = lttng_action_snapshot_session_set_output(
+ action, snapshot_output);
+ if (action_status != LTTNG_ACTION_STATUS_OK) {
+ goto error;
+ }
+
+ /* Ownership has been transferred to the action. */
+ snapshot_output = NULL;
+ }
+
+ variable_data += comm->snapshot_output_len;
+ consumed_len += comm->snapshot_output_len;
+
+ *p_action = action;
+ action = NULL;
+
+ goto end;
+
+error:
+ consumed_len = -1;
+
+end:
+ lttng_action_snapshot_session_destroy(action);
+ lttng_snapshot_output_destroy(snapshot_output);
+
+ return consumed_len;
+}
+
+struct lttng_action *lttng_action_snapshot_session_create(void)
+{
+ struct lttng_action *action;
+
+ action = zmalloc(sizeof(struct lttng_action_snapshot_session));
+ if (!action) {
+ goto end;
+ }
+
+ lttng_action_init(action, LTTNG_ACTION_TYPE_SNAPSHOT_SESSION,
+ lttng_action_snapshot_session_validate,
+ lttng_action_snapshot_session_serialize,
+ lttng_action_snapshot_session_is_equal,
+ lttng_action_snapshot_session_destroy);
+
+end:
+ return action;
+}
+
+enum lttng_action_status lttng_action_snapshot_session_set_session_name(
+ struct lttng_action *action, const char *session_name)
+{
+ struct lttng_action_snapshot_session *action_snapshot_session;
+ enum lttng_action_status status;
+
+ if (!action || !session_name || strlen(session_name) == 0) {
+ status = LTTNG_ACTION_STATUS_INVALID;
+ goto end;
+ }
+
+ action_snapshot_session = action_snapshot_session_from_action(action);
+
+ free(action_snapshot_session->session_name);
+
+ action_snapshot_session->session_name = strdup(session_name);
+ if (!action_snapshot_session->session_name) {
+ status = LTTNG_ACTION_STATUS_ERROR;
+ goto end;
+ }
+
+ status = LTTNG_ACTION_STATUS_OK;
+end:
+ return status;
+}
+
+enum lttng_action_status lttng_action_snapshot_session_get_session_name(
+ const struct lttng_action *action, const char **session_name)
+{
+ const struct lttng_action_snapshot_session *action_snapshot_session;
+ enum lttng_action_status status;
+
+ if (!action || !session_name) {
+ status = LTTNG_ACTION_STATUS_INVALID;
+ goto end;
+ }
+
+ action_snapshot_session = action_snapshot_session_from_action_const(action);
+
+ if (action_snapshot_session->session_name) {
+ *session_name = action_snapshot_session->session_name;
+ status = LTTNG_ACTION_STATUS_OK;
+ } else {
+ status = LTTNG_ACTION_STATUS_UNSET;
+ }
+
+end:
+
+ return status;
+}
+
+enum lttng_action_status lttng_action_snapshot_session_set_output(
+ struct lttng_action *action,
+ struct lttng_snapshot_output *output)
+{
+ struct lttng_action_snapshot_session *action_snapshot_session;
+ enum lttng_action_status status;
+
+ if (!action || !output) {
+ status = LTTNG_ACTION_STATUS_INVALID;
+ goto end;
+ }
+
+ action_snapshot_session = action_snapshot_session_from_action(action);
+
+ lttng_snapshot_output_destroy(action_snapshot_session->output);
+ action_snapshot_session->output = output;
+
+ status = LTTNG_ACTION_STATUS_OK;
+
+end:
+ return status;
+}
+
+enum lttng_action_status lttng_action_snapshot_session_get_output_const(
+ const struct lttng_action *action,
+ const struct lttng_snapshot_output **output)
+{
+ const struct lttng_action_snapshot_session *action_snapshot_session;
+ enum lttng_action_status status;
+
+ if (!action || !output) {
+ status = LTTNG_ACTION_STATUS_INVALID;
+ goto end;
+ }
+
+ action_snapshot_session = action_snapshot_session_from_action_const(action);
+
+ if (action_snapshot_session->output) {
+ *output = action_snapshot_session->output;
+ status = LTTNG_ACTION_STATUS_OK;
+ } else {
+ status = LTTNG_ACTION_STATUS_UNSET;
+ }
+
+end:
+ return status;
+}
projects / lttng-tools.git / blobdiff