// SetExpression will execute the given expr.
//
// If expr.Dest is set it will store the result under the sub tree defined by expr.Dest.
//
// If expr.Dest is nil it will return the result.
//
// Either expr.Op or expr.Code has to be set.
//
// If expr.Op is nil expr.Code will be parsed using SetOpParser to provide expr.Op.
func (self *Conn) SetExpression(expr setop.SetExpression) (result []setop.SetOpResult) {
if expr.Op == nil {
expr.Op = setop.MustParse(expr.Code)
}
var biggestKey []byte
biggestSize := 0
var thisSize int
for key, _ := range findKeys(expr.Op) {
thisSize = self.SubSize([]byte(key))
if biggestKey == nil {
biggestKey = []byte(key)
biggestSize = thisSize
} else if thisSize > biggestSize {
biggestKey = []byte(key)
biggestSize = thisSize
}
}
_, _, successor := self.ring.Remotes(biggestKey)
var results []setop.SetOpResult
err := successor.Call("DHash.SetExpression", expr, &results)
for err != nil {
self.removeNode(*successor)
_, _, successor = self.ring.Remotes(biggestKey)
err = successor.Call("DHash.SetExpression", expr, &results)
}
return results
}
