// GetW works like Get but also returns a channel that will receive
// a single Event value when the data or existence of the given ZooKeeper
// node changes or when critical session events happen. See the
// documentation of the Event type for more details.
func (conn *Conn) GetW(path string) (data string, stat *Stat, watch <-chan Event, err error) {
conn.mutex.RLock()
defer conn.mutex.RUnlock()
if conn.handle == nil {
return "", nil, nil, closingError("getw", path)
}
cpath := C.CString(path)
cbuffer := (*C.char)(C.malloc(bufferSize))
cbufferLen := C.int(bufferSize)
defer C.free(unsafe.Pointer(cpath))
defer C.free(unsafe.Pointer(cbuffer))
watchId, watchChannel := conn.createWatch(true)
var cstat Stat
rc, cerr := C.zoo_wget(conn.handle, cpath, C.watch_handler, unsafe.Pointer(watchId), cbuffer, &cbufferLen, &cstat.c)
if rc != C.ZOK {
conn.forgetWatch(watchId)
return "", nil, nil, zkError(rc, cerr, "getw", path)
}
if cbufferLen != -1 {
data = C.GoStringN(cbuffer, cbufferLen)
}
return data, &cstat, watchChannel, nil
}
// Get returns the data and status from an existing node. err will be nil,
// unless an error is found. Attempting to retrieve data from a non-existing
// node is an error.
func (conn *Conn) Get(path string) (data string, stat *Stat, err error) {
conn.mutex.RLock()
defer conn.mutex.RUnlock()
if conn.handle == nil {
return "", nil, closingError("get", path)
}
cpath := C.CString(path)
cbuffer := (*C.char)(C.malloc(bufferSize))
cbufferLen := C.int(bufferSize)
defer C.free(unsafe.Pointer(cpath))
defer C.free(unsafe.Pointer(cbuffer))
var cstat Stat
rc, cerr := C.zoo_wget(conn.handle, cpath, nil, nil, cbuffer, &cbufferLen, &cstat.c)
if rc != C.ZOK {
return "", nil, zkError(rc, cerr, "get", path)
}
result := C.GoStringN(cbuffer, cbufferLen)
return result, &cstat, nil
}