X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=src%2Fplugins%2Fctf%2Ffs-src%2Fquery.c;h=cabb3683d8c97403ff5da73e05f367bba198fb2a;hb=a7d6bdfd05c148bcb6ceae846fcee1af582d37ed;hp=3a58e1ff23f4b9a311e2b8899133d1be4ac7ff71;hpb=b03487ab5e72f71a01bd7ac78dff3a420b5f9ef8;p=babeltrace.git

diff --git a/src/plugins/ctf/fs-src/query.c b/src/plugins/ctf/fs-src/query.c
index 3a58e1ff..cabb3683 100644
--- a/src/plugins/ctf/fs-src/query.c
+++ b/src/plugins/ctf/fs-src/query.c
@@ -24,8 +24,17 @@
  * SOFTWARE.
  */
 
+#define BT_LOG_OUTPUT_LEVEL log_level
+#define BT_LOG_TAG "PLUGIN/SRC.CTF.FS/QUERY"
+#include "logging/log.h"
+
 #include "query.h"
 #include <stdbool.h>
+#include <glib.h>
+#include <glib/gstdio.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
 #include "common/assert.h"
 #include "metadata.h"
 #include "../common/metadata/decoder.h"
@@ -33,9 +42,7 @@
 #include "common/macros.h"
 #include <babeltrace2/babeltrace.h>
 #include "fs.h"
-
-#define BT_LOG_TAG "PLUGIN/SRC.CTF.FS/QUERY"
-#include "logging.h"
+#include "logging/comp-logging.h"
 
 #define METADATA_TEXT_SIG	"/* CTF 1.8"
 
@@ -46,46 +53,53 @@ struct range {
 };
 
 BT_HIDDEN
-bt_query_status metadata_info_query(
-		bt_self_component_class_source *comp_class,
-		const bt_value *params,
+bt_component_class_query_method_status metadata_info_query(
+		bt_self_component_class_source *self_comp_class_src,
+		const bt_value *params, bt_logging_level log_level,
 		const bt_value **user_result)
 {
-	bt_query_status status = BT_QUERY_STATUS_OK;
+	bt_component_class_query_method_status status =
+		BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK;
+	bt_self_component_class *self_comp_class =
+		bt_self_component_class_source_as_self_component_class(self_comp_class_src);
 	bt_value *result = NULL;
 	const bt_value *path_value = NULL;
-	char *metadata_text = NULL;
 	FILE *metadata_fp = NULL;
-	GString *g_metadata_text = NULL;
 	int ret;
 	int bo;
 	const char *path;
 	bool is_packetized;
+	struct ctf_metadata_decoder *decoder = NULL;
+	struct ctf_metadata_decoder_config decoder_cfg = { 0 };
+	enum ctf_metadata_decoder_status decoder_status;
 
 	result = bt_value_map_create();
 	if (!result) {
-		status = BT_QUERY_STATUS_NOMEM;
+		status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR;
 		goto error;
 	}
 
 	BT_ASSERT(params);
 
 	if (!bt_value_is_map(params)) {
-		BT_LOGE_STR("Query parameters is not a map value object.");
-		status = BT_QUERY_STATUS_INVALID_PARAMS;
+		BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
+			"Query parameters is not a map value object.");
+		status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
 		goto error;
 	}
 
 	path_value = bt_value_map_borrow_entry_value_const(params, "path");
 	if (!path_value) {
-		BT_LOGE_STR("Mandatory `path` parameter missing");
-		status = BT_QUERY_STATUS_INVALID_PARAMS;
+		BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
+			"Mandatory `path` parameter missing");
+		status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
 		goto error;
 	}
 
 	if (!bt_value_is_string(path_value)) {
-		BT_LOGE_STR("`path` parameter is required to be a string value");
-		status = BT_QUERY_STATUS_INVALID_PARAMS;
+		BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
+			"`path` parameter is required to be a string value");
+		status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
 		goto error;
 	}
 
@@ -94,76 +108,52 @@ bt_query_status metadata_info_query(
 	BT_ASSERT(path);
 	metadata_fp = ctf_fs_metadata_open_file(path);
 	if (!metadata_fp) {
-		BT_LOGE("Cannot open trace metadata: path=\"%s\".", path);
+		BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
+			"Cannot open trace metadata: path=\"%s\".", path);
 		goto error;
 	}
 
-	is_packetized = ctf_metadata_decoder_is_packetized(metadata_fp,
-		&bo);
-
-	if (is_packetized) {
-		ret = ctf_metadata_decoder_packetized_file_stream_to_buf(
-			metadata_fp, &metadata_text, bo);
-		if (ret) {
-			BT_LOGE("Cannot decode packetized metadata file: path=\"%s\"",
-				path);
-			goto error;
-		}
-	} else {
-		long filesize;
-
-		ret = fseek(metadata_fp, 0, SEEK_END);
-		if (ret) {
-			BT_LOGE_ERRNO("Failed to seek to the end of the metadata file",
-				": path=\"%s\"", path);
-			goto error;
-		}
-		filesize = ftell(metadata_fp);
-		if (filesize < 0) {
-			BT_LOGE_ERRNO("Failed to get the current position in the metadata file",
-				": path=\"%s\"", path);
-			goto error;
-		}
-		rewind(metadata_fp);
-		metadata_text = malloc(filesize + 1);
-		if (!metadata_text) {
-			BT_LOGE_STR("Cannot allocate buffer for metadata text.");
-			goto error;
-		}
-
-		if (fread(metadata_text, filesize, 1, metadata_fp) != 1) {
-			BT_LOGE_ERRNO("Cannot read metadata file", ": path=\"%s\"",
-				path);
-			goto error;
-		}
-
-		metadata_text[filesize] = '\0';
+	ret = ctf_metadata_decoder_is_packetized(metadata_fp, &is_packetized,
+		&bo, log_level, NULL);
+	if (ret) {
+		BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
+			"Cannot check whether or not the metadata stream is packetized: path=\"%s\".",
+			path);
+		goto error;
 	}
 
-	g_metadata_text = g_string_new(NULL);
-	if (!g_metadata_text) {
+	decoder_cfg.log_level = log_level;
+	decoder_cfg.keep_plain_text = true;
+	decoder = ctf_metadata_decoder_create(&decoder_cfg);
+	if (!decoder) {
+		BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
+			"Cannot create metadata decoder: path=\"%s\".", path);
 		goto error;
 	}
 
-	if (strncmp(metadata_text, METADATA_TEXT_SIG,
-			sizeof(METADATA_TEXT_SIG) - 1) != 0) {
-		g_string_assign(g_metadata_text, METADATA_TEXT_SIG);
-		g_string_append(g_metadata_text, " */\n\n");
+	rewind(metadata_fp);
+	decoder_status = ctf_metadata_decoder_append_content(decoder,
+		metadata_fp);
+	if (decoder_status) {
+		BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
+			"Cannot update metadata decoder's content: path=\"%s\".",
+			path);
+		goto error;
 	}
 
-	g_string_append(g_metadata_text, metadata_text);
-
 	ret = bt_value_map_insert_string_entry(result, "text",
-		g_metadata_text->str);
+		ctf_metadata_decoder_get_text(decoder));
 	if (ret) {
-		BT_LOGE_STR("Cannot insert metadata text into query result.");
+		BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
+			"Cannot insert metadata text into query result.");
 		goto error;
 	}
 
 	ret = bt_value_map_insert_bool_entry(result, "is-packetized",
 		is_packetized);
 	if (ret) {
-		BT_LOGE_STR("Cannot insert \"is-packetized\" attribute into query result.");
+		BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
+			"Cannot insert \"is-packetized\" attribute into query result.");
 		goto error;
 	}
 
@@ -174,18 +164,18 @@ error:
 	result = NULL;
 
 	if (status >= 0) {
-		status = BT_QUERY_STATUS_ERROR;
+		status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
 	}
 
 end:
-	free(metadata_text);
-
-	if (g_metadata_text) {
-		g_string_free(g_metadata_text, TRUE);
-	}
+	ctf_metadata_decoder_destroy(decoder);
 
 	if (metadata_fp) {
-		fclose(metadata_fp);
+		ret = fclose(metadata_fp);
+		if (ret) {
+			BT_LOGE_ERRNO("Cannot close metatada file stream",
+				": path=\"%s\"", path);
+		}
 	}
 
 	*user_result = result;
@@ -197,64 +187,31 @@ int add_range(bt_value *info, struct range *range,
 		const char *range_name)
 {
 	int ret = 0;
-	bt_value_status status;
-	bt_value *range_map = NULL;
+	bt_value_map_insert_entry_status status;
+	bt_value *range_map;
 
 	if (!range->set) {
 		/* Not an error. */
 		goto end;
 	}
 
-	range_map = bt_value_map_create();
-	if (!range_map) {
+	status = bt_value_map_insert_empty_map_entry(info, range_name,
+		&range_map);
+	if (status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
 		ret = -1;
 		goto end;
 	}
 
 	status = bt_value_map_insert_signed_integer_entry(range_map, "begin",
 			range->begin_ns);
-	if (status != BT_VALUE_STATUS_OK) {
+	if (status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
 		ret = -1;
 		goto end;
 	}
 
 	status = bt_value_map_insert_signed_integer_entry(range_map, "end",
 			range->end_ns);
-	if (status != BT_VALUE_STATUS_OK) {
-		ret = -1;
-		goto end;
-	}
-
-	status = bt_value_map_insert_entry(info, range_name,
-		range_map);
-	if (status != BT_VALUE_STATUS_OK) {
-		ret = -1;
-		goto end;
-	}
-
-end:
-	bt_value_put_ref(range_map);
-	return ret;
-}
-
-static
-int add_stream_ids(bt_value *info, struct ctf_fs_ds_file_group *ds_file_group)
-{
-	int ret = 0;
-	bt_value_status status;
-
-	if (ds_file_group->stream_id != UINT64_C(-1)) {
-		status = bt_value_map_insert_unsigned_integer_entry(info, "id",
-			ds_file_group->stream_id);
-		if (status != BT_VALUE_STATUS_OK) {
-			ret = -1;
-			goto end;
-		}
-	}
-
-	status = bt_value_map_insert_unsigned_integer_entry(info, "class-id",
-		ds_file_group->sc->id);
-	if (status != BT_VALUE_STATUS_OK) {
+	if (status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
 		ret = -1;
 		goto end;
 	}
@@ -268,31 +225,10 @@ int populate_stream_info(struct ctf_fs_ds_file_group *group,
 		bt_value *group_info, struct range *stream_range)
 {
 	int ret = 0;
-	size_t file_idx;
-	bt_value_status status;
-	bt_value *file_paths;
+	bt_value_map_insert_entry_status insert_status;
 	struct ctf_fs_ds_index_entry *first_ds_index_entry, *last_ds_index_entry;
 	gchar *port_name = NULL;
 
-	file_paths = bt_value_array_create();
-	if (!file_paths) {
-		ret = -1;
-		goto end;
-	}
-
-	for (file_idx = 0; file_idx < group->ds_file_infos->len; file_idx++) {
-		struct ctf_fs_ds_file_info *info =
-			g_ptr_array_index(group->ds_file_infos,
-				file_idx);
-
-		status = bt_value_array_append_string_element(file_paths,
-				info->path->str);
-		if (status != BT_VALUE_STATUS_OK) {
-			ret = -1;
-			goto end;
-		}
-	}
-
 	/*
 	 * Since each `struct ctf_fs_ds_file_group` has a sorted array of
 	 * `struct ctf_fs_ds_index_entry`, we can compute the stream range from
@@ -327,75 +263,47 @@ int populate_stream_info(struct ctf_fs_ds_file_group *group,
 		goto end;
 	}
 
-	status = bt_value_map_insert_entry(group_info, "paths",
-		file_paths);
-	if (status != BT_VALUE_STATUS_OK) {
-		ret = -1;
-		goto end;
-	}
-
-	ret = add_stream_ids(group_info, group);
-	if (ret) {
-		goto end;
-	}
-
 	port_name = ctf_fs_make_port_name(group);
 	if (!port_name) {
 		ret = -1;
 		goto end;
 	}
 
-	status = bt_value_map_insert_string_entry(group_info, "port-name",
-		port_name);
-	if (status != BT_VALUE_STATUS_OK) {
+	insert_status = bt_value_map_insert_string_entry(group_info,
+		"port-name", port_name);
+	if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
 		ret = -1;
 		goto end;
 	}
 
 end:
-	bt_value_put_ref(file_paths);
+	g_free(port_name);
 	return ret;
 }
 
 static
-int populate_trace_info(const struct ctf_fs_trace *trace, bt_value *trace_info)
+int populate_trace_info(const struct ctf_fs_trace *trace, bt_value *trace_info,
+		bt_logging_level log_level,
+		bt_self_component_class *self_comp_class)
 {
 	int ret = 0;
 	size_t group_idx;
-	bt_value_status status;
+	bt_value_map_insert_entry_status insert_status;
+	bt_value_array_append_element_status append_status;
 	bt_value *file_groups = NULL;
-	struct range trace_range = {
-		.begin_ns = INT64_MAX,
-		.end_ns = 0,
-		.set = false,
-	};
-	struct range trace_intersection = {
-		.begin_ns = 0,
-		.end_ns = INT64_MAX,
-		.set = false,
-	};
 
 	BT_ASSERT(trace->ds_file_groups);
 	/* Add trace range info only if it contains streams. */
 	if (trace->ds_file_groups->len == 0) {
 		ret = -1;
+		BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
+			"Trace has no streams: trace-path=%s", trace->path->str);
 		goto end;
 	}
 
-	file_groups = bt_value_array_create();
-	if (!file_groups) {
-		goto end;
-	}
-
-	status = bt_value_map_insert_string_entry(trace_info, "name",
-		trace->name->str);
-	if (status != BT_VALUE_STATUS_OK) {
-		ret = -1;
-		goto end;
-	}
-	status = bt_value_map_insert_string_entry(trace_info, "path",
-		trace->path->str);
-	if (status != BT_VALUE_STATUS_OK) {
+	insert_status = bt_value_map_insert_empty_array_entry(trace_info,
+		"stream-infos", &file_groups);
+	if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
 		ret = -1;
 		goto end;
 	}
@@ -408,141 +316,94 @@ int populate_trace_info(const struct ctf_fs_trace *trace, bt_value *trace_info)
 		struct ctf_fs_ds_file_group *group = g_ptr_array_index(
 				trace->ds_file_groups, group_idx);
 
-		group_info = bt_value_map_create();
-		if (!group_info) {
+		append_status = bt_value_array_append_empty_map_element(
+			file_groups, &group_info);
+		if (append_status != BT_VALUE_ARRAY_APPEND_ELEMENT_STATUS_OK) {
 			ret = -1;
 			goto end;
 		}
 
 		ret = populate_stream_info(group, group_info, &group_range);
 		if (ret) {
-			bt_value_put_ref(group_info);
 			goto end;
 		}
-
-		status = bt_value_array_append_element(file_groups, group_info);
-		bt_value_put_ref(group_info);
-		if (status != BT_VALUE_STATUS_OK) {
-			goto end;
-		}
-
-		if (group_range.set) {
-			trace_range.begin_ns = MIN(trace_range.begin_ns,
-					group_range.begin_ns);
-			trace_range.end_ns = MAX(trace_range.end_ns,
-					group_range.end_ns);
-			trace_range.set = true;
-
-			trace_intersection.begin_ns = MAX(trace_intersection.begin_ns,
-					group_range.begin_ns);
-			trace_intersection.end_ns = MIN(trace_intersection.end_ns,
-					group_range.end_ns);
-			trace_intersection.set = true;
-		}
-	}
-
-	ret = add_range(trace_info, &trace_range, "range-ns");
-	if (ret) {
-		goto end;
-	}
-
-	if (trace_intersection.begin_ns < trace_intersection.end_ns) {
-		ret = add_range(trace_info, &trace_intersection,
-				"intersection-range-ns");
-		if (ret) {
-			goto end;
-		}
-	}
-
-	status = bt_value_map_insert_entry(trace_info, "streams",
-		file_groups);
-	BT_VALUE_PUT_REF_AND_RESET(file_groups);
-	if (status != BT_VALUE_STATUS_OK) {
-		ret = -1;
-		goto end;
 	}
 
 end:
-	bt_value_put_ref(file_groups);
 	return ret;
 }
 
 BT_HIDDEN
-bt_query_status trace_info_query(
-		bt_self_component_class_source *comp_class,
-		const bt_value *params,
+bt_component_class_query_method_status trace_infos_query(
+		bt_self_component_class_source *self_comp_class_src,
+		const bt_value *params, bt_logging_level log_level,
 		const bt_value **user_result)
 {
 	struct ctf_fs_component *ctf_fs = NULL;
-	bt_query_status status = BT_QUERY_STATUS_OK;
+	bt_component_class_query_method_status status =
+		BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK;
+	bt_self_component_class *self_comp_class =
+		bt_self_component_class_source_as_self_component_class(
+			self_comp_class_src);
 	bt_value *result = NULL;
-	const bt_value *paths_value = NULL;
+	const bt_value *inputs_value = NULL;
+	const bt_value *trace_name_value;
 	int ret = 0;
-	guint i;
+	bt_value *trace_info = NULL;
+	bt_value_array_append_element_status append_status;
 
 	BT_ASSERT(params);
 
 	if (!bt_value_is_map(params)) {
-		BT_LOGE("Query parameters is not a map value object.");
-		status = BT_QUERY_STATUS_INVALID_PARAMS;
+		BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
+			"Query parameters is not a map value object.");
+		status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
 		goto error;
 	}
 
-	ctf_fs = ctf_fs_component_create();
+	ctf_fs = ctf_fs_component_create(log_level, NULL);
 	if (!ctf_fs) {
 		goto error;
 	}
 
-	if (!read_src_fs_parameters(params, &paths_value, ctf_fs)) {
-		status = BT_QUERY_STATUS_INVALID_PARAMS;
+	if (!read_src_fs_parameters(params, &inputs_value, &trace_name_value,
+			ctf_fs, NULL, self_comp_class)) {
+		status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
 		goto error;
 	}
 
-	if (ctf_fs_component_create_ctf_fs_traces(NULL, ctf_fs, paths_value)) {
+	if (ctf_fs_component_create_ctf_fs_trace(ctf_fs, inputs_value,
+			trace_name_value, NULL, self_comp_class)) {
 		goto error;
 	}
 
 	result = bt_value_array_create();
 	if (!result) {
-		status = BT_QUERY_STATUS_NOMEM;
+		status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR;
 		goto error;
 	}
 
-	for (i = 0; i < ctf_fs->traces->len; i++) {
-		struct ctf_fs_trace *trace;
-		bt_value *trace_info;
-		bt_value_status status;
-
-		trace = g_ptr_array_index(ctf_fs->traces, i);
-		BT_ASSERT(trace);
-
-		trace_info = bt_value_map_create();
-		if (!trace_info) {
-			BT_LOGE("Failed to create trace info map.");
-			goto error;
-		}
-
-		ret = populate_trace_info(trace, trace_info);
-		if (ret) {
-			bt_value_put_ref(trace_info);
-			goto error;
-		}
+	append_status = bt_value_array_append_empty_map_element(result,
+		&trace_info);
+	if (append_status != BT_VALUE_ARRAY_APPEND_ELEMENT_STATUS_OK) {
+		BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
+			"Failed to create trace info map.");
+		goto error;
+	}
 
-		status = bt_value_array_append_element(result, trace_info);
-		bt_value_put_ref(trace_info);
-		if (status != BT_VALUE_STATUS_OK) {
-			goto error;
-		}
+	ret = populate_trace_info(ctf_fs->trace, trace_info, log_level,
+		self_comp_class);
+	if (ret) {
+		goto error;
 	}
 
 	goto end;
 
 error:
 	BT_VALUE_PUT_REF_AND_RESET(result);
-	result = NULL;
 
 	if (status >= 0) {
-		status = BT_QUERY_STATUS_ERROR;
+		status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
 	}
 
 end:
@@ -554,3 +415,116 @@ end:
 	*user_result = result;
 	return status;
 }
+
+BT_HIDDEN
+bt_component_class_query_method_status support_info_query(
+		bt_self_component_class_source *comp_class,
+		const bt_value *params, bt_logging_level log_level,
+		const bt_value **user_result)
+{
+	const bt_value *input_type_value;
+	const char *input_type;
+	bt_component_class_query_method_status status;
+	bt_value_map_insert_entry_status insert_entry_status;
+	double weight = 0;
+	gchar *metadata_path = NULL;
+	bt_value *result = NULL;
+	struct ctf_metadata_decoder *metadata_decoder = NULL;
+	FILE *metadata_file = NULL;
+	char uuid_str[BT_UUID_STR_LEN + 1];
+	bool has_uuid = false;
+	const bt_value *input_value;
+	const char *input;
+
+	input_type_value = bt_value_map_borrow_entry_value_const(params, "type");
+	BT_ASSERT(input_type_value);
+	BT_ASSERT(bt_value_get_type(input_type_value) == BT_VALUE_TYPE_STRING);
+	input_type = bt_value_string_get(input_type_value);
+
+	if (strcmp(input_type, "directory") != 0) {
+		goto create_result;
+	}
+
+	input_value = bt_value_map_borrow_entry_value_const(params, "input");
+	BT_ASSERT(input_value);
+	BT_ASSERT(bt_value_get_type(input_value) == BT_VALUE_TYPE_STRING);
+	input = bt_value_string_get(input_value);
+
+	metadata_path = g_build_filename(input, CTF_FS_METADATA_FILENAME, NULL);
+	if (!metadata_path) {
+		status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR;
+		goto end;
+	}
+
+	metadata_file = g_fopen(metadata_path, "rb");
+	if (metadata_file) {
+		struct ctf_metadata_decoder_config metadata_decoder_config = { 0 };
+		enum ctf_metadata_decoder_status decoder_status;
+		bt_uuid_t uuid;
+
+		metadata_decoder_config.log_level = log_level;
+
+		metadata_decoder = ctf_metadata_decoder_create(
+			&metadata_decoder_config);
+		if (!metadata_decoder) {
+			status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
+			goto end;
+		}
+
+		decoder_status = ctf_metadata_decoder_append_content(
+			metadata_decoder, metadata_file);
+		if (decoder_status != CTF_METADATA_DECODER_STATUS_OK) {
+			BT_LOGW("cannot append metadata content: metadata-decoder-status=%d",
+				decoder_status);
+			status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
+			goto end;
+		}
+
+		/*
+		 * We were able to parse the metadata file, so we are
+		 * confident it's a CTF trace.
+		 */
+		weight = 0.75;
+
+		/* If the trace has a UUID, return the stringified UUID as the group. */
+		if (ctf_metadata_decoder_get_trace_class_uuid(metadata_decoder, uuid) == 0) {
+			bt_uuid_to_str(uuid, uuid_str);
+			has_uuid = true;
+		}
+	}
+
+create_result:
+	result = bt_value_map_create();
+	if (!result) {
+		status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR;
+		goto end;
+	}
+
+	insert_entry_status = bt_value_map_insert_real_entry(result, "weight", weight);
+	if (insert_entry_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
+		status = (int) insert_entry_status;
+		goto end;
+	}
+
+	/* We are not supposed to have weight == 0 and a UUID. */
+	BT_ASSERT(weight > 0 || !has_uuid);
+
+	if (weight > 0 && has_uuid) {
+		insert_entry_status = bt_value_map_insert_string_entry(result, "group", uuid_str);
+		if (insert_entry_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
+			status = (int) insert_entry_status;
+			goto end;
+		}
+	}
+
+	*user_result = result;
+	result = NULL;
+	status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK;
+
+end:
+	g_free(metadata_path);
+	bt_value_put_ref(result);
+	ctf_metadata_decoder_destroy(metadata_decoder);
+
+	return status;
+}