Lock*
IxManager_make_snapshot_read_lock(IndexManager *self, const CharBuf *filename)
{
ZombieCharBuf *lock_name = ZCB_WRAP(filename);
LockFactory *lock_factory = S_obtain_lock_factory(self);
if ( !CB_Starts_With_Str(filename, "snapshot_", 9)
|| !CB_Ends_With_Str(filename, ".json", 5)
) {
THROW(ERR, "Not a snapshot filename: %o", filename);
}
// Truncate ".json" from end of snapshot file name.
ZCB_Chop(lock_name, sizeof(".json") - 1);
return LockFact_Make_Shared_Lock(lock_factory, (CharBuf*)lock_name, 1000, 100);
}
static Folder*
S_enclosing_folder(Folder *self, ZombieCharBuf *path) {
size_t path_component_len = 0;
uint32_t code_point;
// Strip trailing slash.
if (ZCB_Code_Point_From(path, 0) == '/') {
ZCB_Chop(path, 1);
}
// Find first component of the file path.
ZombieCharBuf *scratch = ZCB_WRAP((CharBuf*)path);
ZombieCharBuf *path_component = ZCB_WRAP((CharBuf*)path);
while (0 != (code_point = ZCB_Nip_One(scratch))) {
if (code_point == '/') {
ZCB_Truncate(path_component, path_component_len);
ZCB_Nip(path, path_component_len + 1);
break;
}
path_component_len++;
}
// If we've eaten up the entire filepath, self is enclosing folder.
if (ZCB_Get_Size(scratch) == 0) {
return self;
}
Folder *local_folder
= Folder_Local_Find_Folder(self, (CharBuf*)path_component);
if (!local_folder) {
/* This element of the filepath doesn't exist, or it's not a
* directory. However, there are filepath characters left over,
* implying that this component ought to be a directory -- so the
* original file path is invalid. */
return NULL;
}
// This file path component is a folder. Recurse into it.
return S_enclosing_folder(local_folder, path);
}
