/**
* Get the list of children of a given parent (or list of parents).
* \param parent_list [in] list of parents to get the child of
* \param parent_count [in] number of ids in parent list
* \param attr_mask [in] required attributes for children
* \param child_id_list [out] ptr to array of child ids
* \param child_attr_list [out] ptr to array of child attrs
* \param child_count [out] number of returned children
*/
int ListMgr_GetChild( lmgr_t * p_mgr, const lmgr_filter_t * p_filter,
const wagon_t * parent_list, unsigned int parent_count,
int attr_mask,
wagon_t ** child_id_list, attr_set_t ** child_attr_list,
unsigned int * child_count)
{
result_handle_t result;
char *curr;
int filter_main = 0;
int filter_annex = 0;
int main_attrs = 0;
int dnames_attrs = 0;
int annex_attrs = 0;
char query[4096];
char fieldlist_main[1024] = "";
char fieldlist_dnames[1024] = "";
char fieldlist_annex[1024] = "";
char filter_str_main[1024] = "";
char filter_str_annex[1024] = "";
char tmp[2048];
char *path = NULL;
int path_len;
char * pc;
int rc, i;
/* TODO: querying children from several parent cannot work, since
* we need to get the paths of the children. Or we could do a
* lookup into parent_list to find the right one. In the meantime,
* try not to mess up the code. */
if (parent_count != 1)
RBH_BUG("cannot get children for several parent simultaneously");
/* always request for name to build fullpath in wagon */
attr_mask |= ATTR_MASK_name;
/* request is always on the MAIN table (which contains [parent_id, id] relationship */
/* /!\ possible cases:
* - simplest: the fields of the filter and the attributes to be retrieved are in the MAIN table
* - harder: the fields of the filter and attributes are in a different table
*/
/* 1) location of filters */
if ( p_filter )
{
char dummy_str[1024];
unsigned int dummy_uint;
if (dir_filter(p_mgr, dummy_str, p_filter, &dummy_uint) != FILTERDIR_NONE)
{
DisplayLog( LVL_MAJOR, LISTMGR_TAG, "Directory filter not supported in %s()", __func__ );
return DB_NOT_SUPPORTED;
}
else if (func_filter(p_mgr, dummy_str, p_filter, T_MAIN, FALSE, FALSE))
{
DisplayLog( LVL_MAJOR, LISTMGR_TAG, "Function filter not supported in %s()", __func__ );
return DB_NOT_SUPPORTED;
}
/* There is always a filter on T_DNAMES, which is the parent condition.
* Look for optional filters:
*/
filter_main = filter2str( p_mgr, filter_str_main, p_filter, T_MAIN,
FALSE, TRUE );
if ( annex_table )
filter_annex = filter2str( p_mgr, filter_str_annex, p_filter,
T_ANNEX, FALSE, TRUE );
else
filter_annex = 0;
/* @TODO to be implemented */
#if 0
filter_stripe_info =
filter2str( p_mgr, filter_str_stripe_info, p_filter, T_STRIPE_INFO,
( filter_main > 0 ) || ( filter_annex > 0 ), TRUE );
filter_stripe_items =
filter2str( p_mgr, filter_str_stripe_items, p_filter, T_STRIPE_ITEMS,
( filter_main > 0 ) || ( filter_annex > 0 )
|| ( filter_stripe_info > 0 ), TRUE );
#endif
}
/* 2) location of requested attributes */
if (attr_mask)
{
/* retrieve source info for generated fields */
add_source_fields_for_gen( &attr_mask );
main_attrs = attrmask2fieldlist( fieldlist_main, attr_mask, T_MAIN,
/* leading comma */ TRUE, /* for update */ FALSE,
/* prefix */ MAIN_TABLE".", /* postfix */ "" );
dnames_attrs += attrmask2fieldlist( fieldlist_dnames, attr_mask, T_DNAMES,
/* leading comma */ TRUE, /* for update */ FALSE,
/* prefix */ DNAMES_TABLE".", /* postfix */ "" );
if ( annex_table )
annex_attrs = attrmask2fieldlist( fieldlist_annex, attr_mask, T_ANNEX,
/* leading comma */ TRUE, /* for update */ FALSE,
/* prefix */ ANNEX_TABLE".", /* postfix */ "" );
else
annex_attrs = 0;
}
else
{
/* no returned attrs */
if (child_attr_list)
*child_attr_list = NULL;
}
pc = parent_cond(p_mgr, tmp, sizeof(tmp), parent_list, parent_count, DNAMES_TABLE".");
if (!pc)
return DB_BUFFER_TOO_SMALL;
curr = query;
/* SELECT clause */
/* id + dname fields */
curr += sprintf(curr, "SELECT "DNAMES_TABLE".id%s", fieldlist_dnames);
/* main attrs */
if (main_attrs)
curr += sprintf(curr, "%s", fieldlist_main);
/* annex attrs */
if (annex_attrs)
curr += sprintf(curr, "%s", fieldlist_annex);
/* FROM clause */
curr += sprintf(curr, " FROM "DNAMES_TABLE);
if (main_attrs || filter_main)
curr += sprintf(curr, " LEFT JOIN "MAIN_TABLE
" ON "DNAMES_TABLE".id="MAIN_TABLE".id");
if (annex_attrs || filter_annex)
curr += sprintf(curr, " LEFT JOIN "ANNEX_TABLE
" ON "DNAMES_TABLE".id="ANNEX_TABLE".id");
/* WHERE clause */
curr += sprintf(curr, " WHERE %s", pc);
if (filter_main)
curr += sprintf(curr, " AND %s", filter_str_main);
if (filter_annex)
curr += sprintf(curr, " AND %s", filter_str_annex);
retry:
rc = db_exec_sql(&p_mgr->conn, query, &result);
if (lmgr_delayed_retry(p_mgr, rc))
goto retry;
else if (rc)
return rc;
/* copy result to output structures */
*child_count = db_result_nb_records(&p_mgr->conn, &result);
/* allocate entry_id array */
*child_id_list = MemCalloc(*child_count, sizeof(wagon_t));
if (*child_id_list == NULL)
return DB_NO_MEMORY;
if (child_attr_list)
{
*child_attr_list = MemCalloc(*child_count, sizeof(attr_set_t));
if (*child_attr_list == NULL)
{
rc = DB_NO_MEMORY;
goto array_free;
}
}
/* Allocate a string long enough to contain the parent path and a
* child name. */
path_len = strlen(parent_list[0].fullname) + RBH_NAME_MAX + 2;
path = malloc(path_len);
if (!path) {
DisplayLog( LVL_MAJOR, LISTMGR_TAG, "Can't alloc enough memory (%d bytes)",
path_len );
rc = DB_NO_MEMORY;
goto array_free;
}
for (i = 0; i < *child_count; i++)
{
char *res[128]; /* 128 fields per row is large enough */
rc = db_next_record(&p_mgr->conn, &result, res, 128);
if ( rc )
goto array_free;
/* copy id to array */
pk2entry_id(p_mgr, res[0], &((*child_id_list)[i].id));
/* copy attributes to array */
if (child_attr_list)
{
(*child_attr_list)[i].attr_mask = attr_mask;
/* first id, then dnames attrs, then main attrs, then annex attrs */
if (dnames_attrs)
{
/* shift of 1 for id */
rc = result2attrset( T_DNAMES, res + 1, dnames_attrs, &((*child_attr_list)[i]) );
if ( rc )
goto array_free;
}
if (main_attrs)
{
/* first id, then main attrs, then annex attrs */
/* shift of 1 for id */
rc = result2attrset( T_MAIN, res + dnames_attrs + 1, main_attrs, &((*child_attr_list)[i]) );
if ( rc )
goto array_free;
}
if (annex_attrs)
{
/* shift of main_attrs count */
rc = result2attrset( T_ANNEX, res + dnames_attrs + main_attrs + 1, annex_attrs,
&((*child_attr_list)[i]) );
if ( rc )
goto array_free;
}
#ifdef _LUSTRE
if (stripe_fields(attr_mask))
{
if (get_stripe_info( p_mgr, res[0], &ATTR(&(*child_attr_list)[i], stripe_info),
&ATTR(&(*child_attr_list)[i], stripe_items) ))
{
ATTR_MASK_UNSET(&(*child_attr_list)[i], stripe_info);
ATTR_MASK_UNSET(&(*child_attr_list)[i], stripe_items);
}
}
#endif
generate_fields(&((*child_attr_list)[i]));
/* Note: path is properly sized already to not overflow. */
sprintf(path, "%s/%s", parent_list[0].fullname,
(*child_attr_list)[i].attr_values.name);
(*child_id_list)[i].fullname = strdup(path);
}
}
if (path)
free(path);
db_result_free( &p_mgr->conn, &result );
return 0;
array_free:
if (path)
free(path);
if (child_attr_list && *child_attr_list)
{
MemFree(*child_attr_list);
*child_attr_list = NULL;
}
MemFree(*child_id_list);
*child_id_list = NULL;
return rc;
}
/**
* Get the list of children of a given parent (or list of parents).
* \param parent_list [in] list of parents to get the child of
* \param parent_count [in] number of ids in parent list
* \param attr_mask [in] required attributes for children
* \param child_id_list [out] ptr to array of child ids
* \param child_attr_list [out] ptr to array of child attrs
* \param child_count [out] number of returned children
*/
int ListMgr_GetChild(lmgr_t *p_mgr, const lmgr_filter_t *p_filter,
const wagon_t *parent_list, unsigned int parent_count,
attr_mask_t attr_mask,
wagon_t **child_id_list, attr_set_t **child_attr_list,
unsigned int *child_count)
{
result_handle_t result;
char *path = NULL;
int path_len;
int rc, i;
GString *req = NULL;
GString *fields = NULL;
GString *from = NULL;
GString *where = NULL;
struct field_count field_cnt = {0};
struct field_count filter_cnt = {0};
table_enum query_tab = T_DNAMES;
bool distinct = false;
int retry_status;
/* XXX: querying children from several parent cannot work, since
* we need to get the paths of the children. Or we could do a
* lookup into parent_list to find the right one. In the meantime,
* try not to mess up the code. */
if (unlikely(parent_count != 1))
RBH_BUG("cannot get children for several parent simultaneously");
/* always request for name to build fullpath in wagon */
attr_mask_set_index(&attr_mask, ATTR_INDEX_name);
fields = g_string_new(NULL);
/* append fields for all tables */
if (!attr_mask_is_null(attr_mask))
{
/* retrieve source info for generated fields */
add_source_fields_for_gen(&attr_mask.std);
field_cnt.nb_names = attrmask2fieldlist(fields, attr_mask, T_DNAMES,
DNAMES_TABLE".", "",
AOF_LEADING_SEP);
field_cnt.nb_main = attrmask2fieldlist(fields, attr_mask, T_MAIN,
MAIN_TABLE".", "",
AOF_LEADING_SEP);
field_cnt.nb_annex = attrmask2fieldlist(fields, attr_mask, T_ANNEX,
ANNEX_TABLE".", "",
AOF_LEADING_SEP);
}
else
{
/* no returned attrs */
if (child_attr_list != NULL)
*child_attr_list = NULL;
}
where = g_string_new(NULL);
/* starts with condition on parent */
rc = append_parent_cond(p_mgr, where, parent_list, parent_count, DNAMES_TABLE".");
if (rc != DB_SUCCESS)
goto free_str;
/* check filters on other tables */
if (!no_filter(p_filter))
{
if (unlikely(dir_filter(p_mgr, NULL, p_filter, NULL, NULL) != FILTERDIR_NONE))
{
DisplayLog(LVL_MAJOR, LISTMGR_TAG, "Directory filter not supported in %s()", __func__);
rc = DB_NOT_SUPPORTED;
goto free_str;
}
else if (unlikely(func_filter(p_mgr, NULL, p_filter, T_MAIN, 0)))
{
DisplayLog(LVL_MAJOR, LISTMGR_TAG, "Function filter not supported in %s()", __func__);
rc = DB_NOT_SUPPORTED;
goto free_str;
}
/* There is always a filter on T_DNAMES, which is the parent condition.
* Look for optional filters.
*/
filter_where(p_mgr, p_filter, &filter_cnt, where,
AOF_LEADING_SEP | AOF_SKIP_NAME);
/** @FIXME process other filters on NAMES */
}
from = g_string_new(DNAMES_TABLE);
/* add filter_count + field_count to build the FROM clause.
* Preserve field count which is needed to interpret the result.
*/
filter_cnt.nb_main += field_cnt.nb_main;
filter_cnt.nb_annex += field_cnt.nb_annex;
filter_cnt.nb_names += field_cnt.nb_names;
/* query tab is DNAMES, skip_name=true, is_first_tab=T_DNAMES */
filter_from(p_mgr, &filter_cnt, from, &query_tab, &distinct,
AOF_LEADING_SEP | AOF_SKIP_NAME);
/* request is always on the DNAMES table (which contains [parent_id, id] relationship */
if (distinct)
req = g_string_new("SELECT DISTINCT("DNAMES_TABLE".id) as id");
else
req = g_string_new("SELECT "DNAMES_TABLE".id as id");
/* build the whole request */
g_string_append_printf(req, "%s FROM %s WHERE %s", fields->str, from->str, where->str);
retry:
rc = db_exec_sql(&p_mgr->conn, req->str, &result);
retry_status = lmgr_delayed_retry(p_mgr, rc);
if (retry_status == 1)
goto retry;
else if (retry_status == 2) {
rc = DB_RBH_SIG_SHUTDOWN;
goto free_str;
} else if (rc)
goto free_str;
/* copy result to output structures */
*child_count = db_result_nb_records(&p_mgr->conn, &result);
/* allocate entry_id array */
*child_id_list = MemCalloc(*child_count, sizeof(wagon_t));
if (*child_id_list == NULL)
{
rc = DB_NO_MEMORY;
goto free_str;
}
if (child_attr_list)
{
*child_attr_list = MemCalloc(*child_count, sizeof(attr_set_t));
if (*child_attr_list == NULL)
{
rc = DB_NO_MEMORY;
goto array_free;
}
}
/* Allocate a string long enough to contain the parent path and a
* child name. */
path_len = strlen(parent_list[0].fullname) + RBH_NAME_MAX + 2;
path = malloc(path_len);
if (!path) {
DisplayLog(LVL_MAJOR, LISTMGR_TAG, "Can't alloc enough memory (%d bytes)",
path_len);
rc = DB_NO_MEMORY;
goto array_free;
}
for (i = 0; i < *child_count; i++)
{
char *res[128]; /* 128 fields per record is large enough */
rc = db_next_record(&p_mgr->conn, &result, res, sizeof(res)/sizeof(*res));
if (rc)
goto array_free;
/* copy id to array */
pk2entry_id(p_mgr, res[0], &((*child_id_list)[i].id));
/* copy attributes to array */
if (child_attr_list)
{
unsigned int shift = 1; /* first was NAMES.id */
(*child_attr_list)[i].attr_mask = attr_mask;
/* first id, then dnames attrs, then main attrs, then annex attrs */
if (field_cnt.nb_names > 0)
{
/* shift of 1 for id */
rc = result2attrset(T_DNAMES, res + shift, field_cnt.nb_names, &((*child_attr_list)[i]));
if (rc)
goto array_free;
shift += field_cnt.nb_names;
}
if (field_cnt.nb_main > 0)
{
/* first id, then main attrs, then annex attrs */
/* shift of 1 for id */
rc = result2attrset(T_MAIN, res + shift, field_cnt.nb_main, &((*child_attr_list)[i]));
if (rc)
goto array_free;
shift += field_cnt.nb_main;
}
if (field_cnt.nb_annex > 0)
{
/* shift of main_attrs count */
rc = result2attrset(T_ANNEX, res + shift, field_cnt.nb_annex,
&((*child_attr_list)[i]));
if (rc)
goto array_free;
shift += field_cnt.nb_annex;
}
#ifdef _LUSTRE
if (stripe_fields(attr_mask))
{
if (get_stripe_info(p_mgr, res[0], &ATTR(&(*child_attr_list)[i], stripe_info),
&ATTR(&(*child_attr_list)[i], stripe_items)))
{
ATTR_MASK_UNSET(&(*child_attr_list)[i], stripe_info);
ATTR_MASK_UNSET(&(*child_attr_list)[i], stripe_items);
}
}
#endif
generate_fields(&((*child_attr_list)[i]));
/* Note: path is properly sized already to not overflow. */
snprintf(path, path_len, "%s/%s", parent_list[0].fullname,
(*child_attr_list)[i].attr_values.name);
(*child_id_list)[i].fullname = strdup(path);
}
}
if (path)
free(path);
db_result_free(&p_mgr->conn, &result);
g_string_free(req, TRUE);
g_string_free(fields, TRUE);
g_string_free(from, TRUE);
g_string_free(where, TRUE);
return 0;
array_free:
if (path)
free(path);
if (child_attr_list && *child_attr_list)
{
MemFree(*child_attr_list);
*child_attr_list = NULL;
}
MemFree(*child_id_list);
*child_id_list = NULL;
free_str:
g_string_free(req, TRUE);
g_string_free(fields, TRUE);
g_string_free(from, TRUE);
g_string_free(where, TRUE);
return rc;
}
