/**
* Destroys a bloom filter
* @arg filter The filter to destroy
* @return 0 on success
*/
int destroy_bloom_filter(bloom_filter *filter) {
// Close first
bloomf_close(filter);
// Cleanup
free(filter->filter_name);
free(filter->full_path);
free(filter);
return 0;
}
/**
* Invoked to cleanup a filter once we
* have hit 0 remaining references.
*/
static void delete_filter(bloom_filter_wrapper *filt) {
// Delete or Close the filter
if (filt->should_delete)
bloomf_delete(filt->filter);
else
bloomf_close(filt->filter);
// Cleanup the filter
destroy_bloom_filter(filt->filter);
// Release any custom configs
if (filt->custom) {
free(filt->custom);
}
// Release the struct
free(filt);
return;
}
/**
* Unmaps the filter from memory, but leaves it
* registered in the filter manager. This is rarely invoked
* by a client, as it can be handled automatically by bloomd,
* but particular clients with specific needs may use it as an
* optimization.
* @arg filter_name The name of the filter to delete
* @return 0 on success, -1 if the filter does not exist.
*/
int filtmgr_unmap_filter(bloom_filtmgr *mgr, char *filter_name) {
// Get the filter
bloom_filter_wrapper *filt = take_filter(mgr, filter_name);
if (!filt) return -1;
// Skip if we are in memory
if (filt->filter->filter_config.in_memory)
goto LEAVE;
// Acquire the write lock
pthread_rwlock_wrlock(&filt->rwlock);
// Close the filter
bloomf_close(filt->filter);
// Release the lock
pthread_rwlock_unlock(&filt->rwlock);
LEAVE:
return 0;
}
/**
* Deletes the bloom filter with
* extreme prejudice.
* @arg filter The filter to delete
* @return 0 on success.
*/
int bloomf_delete(bloom_filter *filter) {
// Close first
bloomf_close(filter);
// Delete the files
struct dirent **namelist = NULL;
int num;
// Filter only data dirs, in sorted order
num = scandir(filter->full_path, &namelist, filter_out_special, NULL);
syslog(LOG_INFO, "Deleting %d files for filter %s.", num, filter->filter_name);
// Free the memory associated with scandir
for (int i=0; i < num; i++) {
char *file_path = join_path(filter->full_path, namelist[i]->d_name);
syslog(LOG_INFO, "Deleting: %s.", file_path);
if (unlink(file_path)) {
syslog(LOG_ERR, "Failed to delete: %s. %s", file_path, strerror(errno));
}
free(file_path);
}
// Free the memory associated with scandir
for (int i=0; i < num; i++) {
free(namelist[i]);
}
if (namelist)
free(namelist);
// Delete the directory
if (rmdir(filter->full_path)) {
syslog(LOG_ERR, "Failed to delete: %s. %s", filter->full_path, strerror(errno));
}
return 0;
}