// Implements storage.Interface.
func (h *etcdHelper) GetToList(key string, filter storage.FilterFunc, listObj runtime.Object) error {
trace := util.NewTrace("GetToList " + getTypeName(listObj))
listPtr, err := runtime.GetItemsPtr(listObj)
if err != nil {
return err
}
key = h.prefixEtcdKey(key)
startTime := time.Now()
trace.Step("About to read etcd node")
response, err := h.client.Get(key, false, false)
metrics.RecordEtcdRequestLatency("get", getTypeName(listPtr), startTime)
trace.Step("Etcd node read")
if err != nil {
if IsEtcdNotFound(err) {
return nil
}
return err
}
nodes := make([]*etcd.Node, 0)
nodes = append(nodes, response.Node)
if err := h.decodeNodeList(nodes, filter, listPtr); err != nil {
return err
}
trace.Step("Object decoded")
if h.versioner != nil {
if err := h.versioner.UpdateList(listObj, response.EtcdIndex); err != nil {
return err
}
}
return nil
}
// Implements storage.Interface.
func (h *etcdHelper) List(key string, filter storage.FilterFunc, listObj runtime.Object) error {
trace := util.NewTrace("List " + getTypeName(listObj))
defer trace.LogIfLong(time.Second)
listPtr, err := runtime.GetItemsPtr(listObj)
if err != nil {
return err
}
key = h.prefixEtcdKey(key)
startTime := time.Now()
trace.Step("About to list etcd node")
nodes, index, err := h.listEtcdNode(key)
metrics.RecordEtcdRequestLatency("list", getTypeName(listPtr), startTime)
trace.Step("Etcd node listed")
if err != nil {
return err
}
if err := h.decodeNodeList(nodes, filter, listPtr); err != nil {
return err
}
trace.Step("Node list decoded")
if h.versioner != nil {
if err := h.versioner.UpdateList(listObj, index); err != nil {
return err
}
}
return nil
}
// ListFromMemory implements list operation (the same signature as List method)
// but it serves the contents from memory.
// Current we cannot use ListFromMemory() instead of List(), because it only
// guarantees eventual consistency (e.g. it's possible for Get called right after
// Create to return not-exist, before the change is propagate).
// TODO: We may consider changing to use ListFromMemory in the future, but this
// requires wider discussion as an "api semantic change".
func (c *Cacher) ListFromMemory(key string, listObj runtime.Object) error {
// Do NOT allow Watch to start when the underlying structures are not propagated.
c.usable.RLock()
defer c.usable.RUnlock()
listPtr, err := runtime.GetItemsPtr(listObj)
if err != nil {
return err
}
listVal, err := conversion.EnforcePtr(listPtr)
if err != nil || listVal.Kind() != reflect.Slice {
return fmt.Errorf("need a pointer to slice, got %v", listVal.Kind())
}
filter := filterFunction(key, c.keyFunc, Everything)
objs, resourceVersion := c.watchCache.ListWithVersion()
for _, obj := range objs {
object, ok := obj.(runtime.Object)
if !ok {
return fmt.Errorf("non runtime.Object returned from storage: %v", obj)
}
if filter(object) {
listVal.Set(reflect.Append(listVal, reflect.ValueOf(object).Elem()))
}
}
if c.versioner != nil {
if err := c.versioner.UpdateList(listObj, resourceVersion); err != nil {
return err
}
}
return nil
}