func (c *ClusterClient) Watch(fn func(*Tx) error, keys ...string) error {
node, err := c.slotMasterNode(hashtag.Slot(keys[0]))
if err != nil {
return err
}
return node.Client.Watch(fn, keys...)
}
func (c *ClusterClient) cmdSlotAndNode(cmd Cmder) (int, *clusterNode, error) {
cmdInfo := c.cmdInfo(cmd.arg(0))
if cmdInfo == nil {
internal.Logf("info for cmd=%s not found", cmd.arg(0))
node, err := c.randomNode()
return 0, node, err
}
if cmdInfo.FirstKeyPos == -1 {
node, err := c.randomNode()
return 0, node, err
}
firstKey := cmd.arg(int(cmdInfo.FirstKeyPos))
slot := hashtag.Slot(firstKey)
if cmdInfo.ReadOnly && c.opt.ReadOnly {
if c.opt.RouteByLatency {
node, err := c.slotClosestNode(slot)
return slot, node, err
}
node, err := c.slotSlaveNode(slot)
return slot, node, err
}
node, err := c.slotMasterNode(slot)
return slot, node, err
}