// List clients that have locked the named object lock and information about the lock.
// The number of bytes required in each buffer is put in the corresponding size out parameter.
// If any of the provided buffers are too short, -ERANGE is returned after these sizes are filled in.
func (ioctx *IOContext) ListLockers(oid, name string) (*LockInfo, error) {
c_oid := C.CString(oid)
c_name := C.CString(name)
c_tag := (*C.char)(C.malloc(C.size_t(1024)))
c_clients := (*C.char)(C.malloc(C.size_t(1024)))
c_cookies := (*C.char)(C.malloc(C.size_t(1024)))
c_addrs := (*C.char)(C.malloc(C.size_t(1024)))
var c_exclusive C.int
c_tag_len := C.size_t(1024)
c_clients_len := C.size_t(1024)
c_cookies_len := C.size_t(1024)
c_addrs_len := C.size_t(1024)
defer C.free(unsafe.Pointer(c_oid))
defer C.free(unsafe.Pointer(c_name))
defer C.free(unsafe.Pointer(c_tag))
defer C.free(unsafe.Pointer(c_clients))
defer C.free(unsafe.Pointer(c_cookies))
defer C.free(unsafe.Pointer(c_addrs))
ret := C.rados_list_lockers(
ioctx.ioctx,
c_oid,
c_name,
&c_exclusive,
c_tag,
&c_tag_len,
c_clients,
&c_clients_len,
c_cookies,
&c_cookies_len,
c_addrs,
&c_addrs_len)
splitCString := func(items *C.char, itemsLen C.size_t) []string {
currLen := 0
clients := []string{}
for currLen < int(itemsLen) {
client := C.GoString(C.nextChunk(&items))
clients = append(clients, client)
currLen += len(client) + 1
}
return clients
}
if ret < 0 {
return nil, RadosError(int(ret))
} else {
return &LockInfo{int(ret), c_exclusive == 1, C.GoString(c_tag), splitCString(c_clients, c_clients_len), splitCString(c_cookies, c_cookies_len), splitCString(c_addrs, c_addrs_len)}, nil
}
}
// ListLockers show all the clients that has locks on the object. This also returns the lock tag if any.
func (o *Object) ListLockers(name string) ([]*Locker, string, error) {
oid := C.CString(o.name)
defer freeString(oid)
n := C.CString(name)
defer freeString(n)
var exclusive C.int
bufLen := 2048
var tagLen C.size_t
var clientsLen C.size_t
var cookiesLen C.size_t
var addrsLen C.size_t
for {
cTag := bufferAddress(bufLen)
cClients := bufferAddress(bufLen)
cCookies := bufferAddress(bufLen)
cAddrs := bufferAddress(bufLen)
ret := C.rados_list_lockers(o.ioContext, oid, n, &exclusive, cTag, &tagLen, cClients, &clientsLen, cCookies, &cookiesLen, cAddrs, &addrsLen)
if int(ret) == -int(syscall.ERANGE) {
bufLen *= 2
continue
}
if err := toRadosError(C.int(ret)); err != nil {
err.Message = fmt.Sprintf("Unable to get lockers for object %s.", o.name)
return nil, "", err
}
tag := C.GoStringN(cTag, C.int(tagLen))
clients := bufToStringSlice(cClients, C.int(clientsLen))
cookies := bufToStringSlice(cCookies, C.int(cookiesLen))
addrs := bufToStringSlice(cAddrs, C.int(addrsLen))
lockers := make([]*Locker, ret)
for i := 0; i < int(ret); i++ {
lockers[i] = &Locker{
Client: clients[i],
Cookies: cookies[i],
Address: addrs[i],
}
}
return lockers, tag, nil
}
}
