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media_index.c: Refactored so it doesn't cache the index

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Testing revealed that the cache added no benefit but that it could
consume excessive memory.

Two new index related functions were created:
ast_sounds_get_index_for_file() and ast_media_index_update_for_file()
which restrict index updating to specific sound files.

The original ast_sounds_get_index() and ast_media_index_update()
calls are still available but since they no longer cache the results
internally, developers should re-use an index they may already have
instead of calling ast_sounds_get_index() repeatedly.  If information
for only a single file is needed, ast_sounds_get_index_for_file()
should be called instead of ast_sounds_get_index().

The media_index directory scan code was elimininated in favor of
using the existing ast_file_read_dirs() function.

Since there's no more cache, ast_sounds_index_init now only
registers the sounds cli commands instead of generating the
initial index and subscribing to stasis format register/unregister
messages.

"sounds" is no longer a valid target for the "module reload"
command.

Both the sounds cli commands and the sounds ari resources were
refactored to only call ast_sounds_get_index() once per invocation
and to use ast_sounds_get_index_for_file() when a specific sound
file is requested.

Change-Id: I1cef327ba1b0648d85d218b70ce469ad07f4aa8d
This commit is contained in:
George Joseph
2019-01-22 08:02:06 -07:00
parent 6118b65a5a
commit 7071e9d64c
6 changed files with 277 additions and 212 deletions
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226
main/media_index.c
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@@ -380,7 +380,8 @@ static int process_media_file(struct ast_media_index *index, const char *variant
static int process_description_file(struct ast_media_index *index,
const char *subdir,
const char *variant_str,
const char *filename)
const char *filename,
const char *match_filename)
{
RAII_VAR(struct ast_str *, description_file_path, ast_str_create(64), ast_free);
RAII_VAR(struct ast_str *, cumulative_description, ast_str_create(64), ast_free);
@@ -450,16 +451,21 @@ static int process_description_file(struct ast_media_index *index,
if (file_id_persist && !ast_strlen_zero(ast_str_buffer(cumulative_description))) {
struct media_variant *variant;
variant = alloc_variant(index, file_id_persist, variant_str);
if (!variant) {
res = -1;
break;
/*
* If we were only searching for a specific sound filename
* don't include others.
*/
if (ast_strlen_zero(match_filename) || strcmp(match_filename, file_id_persist) == 0) {
variant = alloc_variant(index, file_id_persist, variant_str);
if (!variant) {
res = -1;
break;
}
ast_string_field_set(variant, description, ast_str_buffer(cumulative_description));
ao2_ref(variant, -1);
}
ast_string_field_set(variant, description, ast_str_buffer(cumulative_description));
ast_str_reset(cumulative_description);
ao2_ref(variant, -1);
}
ast_free(file_id_persist);
@@ -473,12 +479,18 @@ static int process_description_file(struct ast_media_index *index,
if (file_id_persist && !ast_strlen_zero(ast_str_buffer(cumulative_description))) {
struct media_variant *variant;
variant = alloc_variant(index, file_id_persist, variant_str);
if (variant) {
ast_string_field_set(variant, description, ast_str_buffer(cumulative_description));
ao2_ref(variant, -1);
} else {
res = -1;
/*
* If we were only searching for a specific sound filename
* don't include others.
*/
if (ast_strlen_zero(match_filename) || strcmp(match_filename, file_id_persist) == 0) {
variant = alloc_variant(index, file_id_persist, variant_str);
if (variant) {
ast_string_field_set(variant, description, ast_str_buffer(cumulative_description));
ao2_ref(variant, -1);
} else {
res = -1;
}
}
}
@@ -487,110 +499,116 @@ static int process_description_file(struct ast_media_index *index,
return res;
}
/*! \brief process an individual file listing */
static int process_file(struct ast_media_index *index, const char *variant_str, const char *subdir, const char *filename)
{
RAII_VAR(char *, filename_stripped, ast_strdup(filename), ast_free);
char *ext;
struct read_dirs_data {
const char *search_filename;
size_t search_filename_len;
const char *search_variant;
struct ast_media_index *index;
size_t dirname_len;
};
if (!filename_stripped) {
return -1;
static int read_dirs_cb(const char *dir_name, const char *filename, void *obj)
{
struct read_dirs_data *data = obj;
char *ext;
size_t match_len;
char *match;
size_t match_base_len;
char *subdirs = (char *)dir_name + data->dirname_len;
/*
* Example:
* From the filesystem:
* index's base_dir = "/var/lib/asterisk/sounds"
* search_variant = "en"
* search directory base = "/var/lib/asterisk/sounds/en"
* dirname_len = 27
* current dir_name = "/var/lib/asterisk/sounds/en/digits"
* subdirs = "/digits"
* filename = "1.ulaw"
*
* From the search criteria:
* search_filename = "digits/1"
* search_filename_len = 8
*/
if (*subdirs == '/') {
subdirs++;
}
ext = strrchr(filename_stripped, '.');
/* subdirs = "digits" */
match_len = strlen(subdirs) + strlen(filename) + 2;
match = ast_alloca(match_len);
snprintf(match, match_len, "%s%s%s", subdirs,
ast_strlen_zero(subdirs) ? "" : "/", filename);
/* match = discovered filename relative to language = "digits/1.ulaw" */
ext = strrchr(match, '.');
if (!ext) {
/* file has no extension */
return 0;
}
*ext++ = '\0';
if (!strcmp(ext, "txt")) {
if (process_description_file(index, subdir, variant_str, filename)) {
return -1;
}
} else {
if (process_media_file(index, variant_str, subdir, filename_stripped, ext)) {
return -1;
/* ext = ".ulaw" */
if (data->search_filename_len > 0) {
match_base_len = ext - match;
/*
* match_base_len = length of "digits/1" = 8 which
* happens to match the length of search_filename.
* However if the discovered filename was 11.ulaw
* it would be length of "digits/11" = 9.
* We need to use the larger during the compare to
* make sure we don't match just search_filename
* as a substring of the discovered filename.
*/
if (data->search_filename_len > match_base_len) {
match_base_len = data->search_filename_len;
}
}
/* We always process txt files because they should contain description. */
if (strcmp(ext, ".txt") == 0) {
if (process_description_file(data->index, NULL, data->search_variant,
match, data->search_filename)) {
return -1;
}
} else if (data->search_filename_len == 0
|| strncmp(data->search_filename, match, match_base_len ) == 0) {
*ext = '\0';
ext++;
process_media_file(data->index, data->search_variant, NULL, match, ext);
}
return 0;
}
/*! \brief internal function for updating the index, recursive */
static int media_index_update(struct ast_media_index *index,
const char *variant,
const char *subdir)
int ast_media_index_update_for_file(struct ast_media_index *index,
const char *variant, const char *filename)
{
struct dirent* dent;
DIR* srcdir;
RAII_VAR(struct ast_str *, index_dir, ast_str_create(64), ast_free);
RAII_VAR(struct ast_str *, statfile, ast_str_create(64), ast_free);
int res = 0;
struct timeval start;
struct timeval end;
int64_t elapsed;
int rc;
size_t dirname_len = strlen(index->base_dir) + strlen(S_OR(variant, "")) + 1;
struct read_dirs_data data = {
.search_filename = S_OR(filename, ""),
.search_filename_len = strlen(S_OR(filename, "")),
.search_variant = S_OR(variant, ""),
.index = index,
.dirname_len = dirname_len,
};
char *search_dir = ast_alloca(dirname_len + 1);
if (!index_dir) {
return 0;
}
sprintf(search_dir, "%s%s%s", index->base_dir, ast_strlen_zero(variant) ? "" : "/",
data.search_variant);
ast_str_set(&index_dir, 0, "%s", index->base_dir);
if (!ast_strlen_zero(variant)) {
ast_str_append(&index_dir, 0, "/%s", variant);
}
if (!ast_strlen_zero(subdir)) {
ast_str_append(&index_dir, 0, "/%s", subdir);
}
gettimeofday(&start, NULL);
rc = ast_file_read_dirs(search_dir, read_dirs_cb, &data, -1);
gettimeofday(&end, NULL);
elapsed = ast_tvdiff_us(end, start);
ast_debug(1, "Media for language '%s' indexed in %8.6f seconds\n", data.search_variant, elapsed / 1E6);
srcdir = opendir(ast_str_buffer(index_dir));
if (srcdir == NULL) {
ast_log(LOG_ERROR, "Failed to open %s: %s\n", ast_str_buffer(index_dir), strerror(errno));
return -1;
}
while((dent = readdir(srcdir)) != NULL) {
struct stat st;
if(!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, "..")) {
continue;
}
ast_str_reset(statfile);
ast_str_set(&statfile, 0, "%s/%s", ast_str_buffer(index_dir), dent->d_name);
if (stat(ast_str_buffer(statfile), &st) < 0) {
ast_log(LOG_WARNING, "Failed to stat %s: %s\n", ast_str_buffer(statfile), strerror(errno));
continue;
}
if (S_ISDIR(st.st_mode)) {
if (ast_strlen_zero(subdir)) {
res = media_index_update(index, variant, dent->d_name);
} else {
RAII_VAR(struct ast_str *, new_subdir, ast_str_create(64), ast_free);
ast_str_set(&new_subdir, 0, "%s/%s", subdir, dent->d_name);
res = media_index_update(index, variant, ast_str_buffer(new_subdir));
}
if (res) {
break;
}
continue;
}
if (!S_ISREG(st.st_mode)) {
continue;
}
if (process_file(index, variant, subdir, dent->d_name)) {
res = -1;
break;
}
}
closedir(srcdir);
return res;
}
int ast_media_index_update(struct ast_media_index *index,
const char *variant)
{
return media_index_update(index, variant, NULL);
return rc;
}