#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <regex.h>
#include <common/common.h>
#include <common/defaults.h>
#include "lttng-relayd.h"
#include "utils.h"
-static char *create_output_path_auto(char *path_name)
+#define DATETIME_STRING_SIZE 16
+
+#define DATETIME_REGEX ".*-[0-9][0-9][0-9][0-9][0-1][0-9][0-3][0-9]-[0-2][0-9][0-5][0-9][0-5][0-9]$"
+
+static char *get_filesystem_per_session(const char *path, const char *local_session_name) {
+ int ret;
+ char *local_copy = NULL;
+ char *session_name = NULL;
+ char *datetime = NULL;
+ char *extra_path = NULL;
+ char *hostname_ptr;
+ const char *second_token_ptr;
+ char *leftover_ptr;
+ char *filepath_per_session = NULL;
+ regex_t regex;
+
+ /* Get a local copy for strtok */
+ local_copy = strdup(path);
+ if (!local_copy) {
+ ERR("strdup of local copy failed");
+ goto error;
+ }
+
+ /*
+ * The use of strtok with '/' as delimiter is valid since we refuse '/'
+ * in session name and '/' is not a valid hostname character based on
+ * RFC-952 [1], RFC-921 [2] and refined in RFC-1123 [2].
+ * [1] https://tools.ietf.org/html/rfc952
+ * [2] https://tools.ietf.org/html/rfc921
+ * [3] https://tools.ietf.org/html/rfc1123#page-13
+ */
+
+ /*
+ * Get the hostname and possible session_name.
+ * Note that we can get the hostname and session name from the
+ * relay_session object we already have. Still, it is easier to
+ * tokenized the passed path to obtain the start of the path leftover.
+ */
+ hostname_ptr = strtok_r(local_copy, "/", &leftover_ptr);
+ if (!hostname_ptr) {
+ ERR("hostname token not found");
+ goto error;
+ }
+
+ second_token_ptr = strtok_r(NULL, "/", &leftover_ptr);
+ if (!second_token_ptr) {
+ ERR("Session name token not found");
+ goto error;
+ }
+
+ /*
+ * Check if the second token is a extra path set at url level. This is
+ * legal in streaming, live and snapshot [1]. Otherwise it is the
+ * session name with possibly a datetime attached [2]. Note that when
+ * "adding" snapshot output (lttng snapshot add-output), no session name
+ * is present in the path by default. The handling for "extra path" take
+ * care of this case as well.
+ * [1] e.g --set-url net://localhost/my_marvellous_path
+ * [2] Can be:
+ * <session_name>
+ * When using --snapshot on session create.
+ * <session_name>-<date>-<time>
+ * auto-<date>-<time>
+ */
+ if (strncmp(second_token_ptr, local_session_name, strlen(local_session_name)) != 0) {
+ /* Match */
+ extra_path = strdup(second_token_ptr);
+ /*
+ * Point the second token ptr to local_session_name for further
+ * information extraction based on the session name
+ */
+ second_token_ptr = local_session_name;
+ } else {
+ extra_path = strdup("");
+ }
+ if (!extra_path) {
+ ERR("strdup extra path failed");
+ goto error;
+ }
+
+ /*
+ * The recovery of the session datetime is a best effort here.
+ * We use a regex to validate that a datetime is present.
+ * We can end up in corner case were the end of a
+ * session name is the same format as our datetime but is not really a
+ * datetime. This is not so much of an issue since most of the time the
+ * datetime will be appended and result in the correct case.
+ * Possible cases:
+ * <session_name>
+ * <session_name>-<date>-<time>
+ * auto-<date>-<time>
+ */
+ ret = regcomp(®ex, DATETIME_REGEX, 0);
+ if (ret) {
+ ERR("Regex compilation failed with %d", ret);
+ goto error;
+ }
+
+ ret = regexec(®ex, second_token_ptr, 0, NULL, 0);
+ if (!ret) {
+ /* Match */
+ session_name = strndup(second_token_ptr, strlen(second_token_ptr) - DATETIME_STRING_SIZE);
+ datetime = strdup(&second_token_ptr[strlen(second_token_ptr) - DATETIME_STRING_SIZE +1]);
+ } else {
+ /* No datetime present */
+ session_name = strdup(second_token_ptr);
+ datetime = strdup("");
+ }
+
+ if (!session_name) {
+ ERR("strdup session_name on regex match failed");
+ goto error_regex;
+ }
+ if (!datetime) {
+ ERR("strdup datetime on regex match failed");
+ goto error_regex;
+ }
+
+ ret = asprintf(&filepath_per_session, "%s/%s%s%s/%s/%s", session_name,
+ hostname_ptr,
+ datetime[0] != '\0' ? "-" : "",
+ datetime, extra_path, leftover_ptr);
+ if (ret < 0) {
+ filepath_per_session = NULL;
+ goto error;
+ }
+error_regex:
+ regfree(®ex);
+error:
+ free(extra_path);
+ free(local_copy);
+ free(session_name);
+ free(datetime);
+ return filepath_per_session;
+}
+
+static char *create_output_path_auto(const char *path_name)
{
int ret;
char *traces_path = NULL;
*
* Return the allocated string containing the path name or else NULL.
*/
-char *create_output_path(char *path_name)
+char *create_output_path(const char *path_name, char *session_name)
{
+ char *real_path = NULL;
+ char *return_path = NULL;
assert(path_name);
+ if (opt_group_output_by_session) {
+ real_path = get_filesystem_per_session(path_name, session_name);
+ } else if (opt_group_output_by_host) {
+ /* By default the output is by host */
+ real_path = strdup(path_name);
+ } else {
+ ERR("Configuration error");
+ assert(0);
+ }
+
+ if (!real_path) {
+ goto error;
+ }
+
if (opt_output_path == NULL) {
- return create_output_path_auto(path_name);
+ return_path = create_output_path_auto(real_path);
} else {
- return create_output_path_noauto(path_name);
+ return_path = create_output_path_noauto(real_path);
}
+error:
+ free(real_path);
+ return return_path;
}
projects / lttng-tools.git / blobdiff