/
query_range.go
123 lines (98 loc) · 2.58 KB
/
query_range.go
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package indexer
import (
"time"
"github.com/tendermint/tendermint/libs/pubsub/query"
)
// QueryRanges defines a mapping between a composite event key and a QueryRange.
//
// e.g.account.number => queryRange{lowerBound: 1, upperBound: 5}
type QueryRanges map[string]QueryRange
// QueryRange defines a range within a query condition.
type QueryRange struct {
LowerBound interface{} // int || time.Time
UpperBound interface{} // int || time.Time
Key string
IncludeLowerBound bool
IncludeUpperBound bool
}
// AnyBound returns either the lower bound if non-nil, otherwise the upper bound.
func (qr QueryRange) AnyBound() interface{} {
if qr.LowerBound != nil {
return qr.LowerBound
}
return qr.UpperBound
}
// LowerBoundValue returns the value for the lower bound. If the lower bound is
// nil, nil will be returned.
func (qr QueryRange) LowerBoundValue() interface{} {
if qr.LowerBound == nil {
return nil
}
if qr.IncludeLowerBound {
return qr.LowerBound
}
switch t := qr.LowerBound.(type) {
case int64:
return t + 1
case time.Time:
return t.Unix() + 1
default:
panic("not implemented")
}
}
// UpperBoundValue returns the value for the upper bound. If the upper bound is
// nil, nil will be returned.
func (qr QueryRange) UpperBoundValue() interface{} {
if qr.UpperBound == nil {
return nil
}
if qr.IncludeUpperBound {
return qr.UpperBound
}
switch t := qr.UpperBound.(type) {
case int64:
return t - 1
case time.Time:
return t.Unix() - 1
default:
panic("not implemented")
}
}
// LookForRanges returns a mapping of QueryRanges and the matching indexes in
// the provided query conditions.
func LookForRanges(conditions []query.Condition) (ranges QueryRanges, indexes []int) {
ranges = make(QueryRanges)
for i, c := range conditions {
if IsRangeOperation(c.Op) {
r, ok := ranges[c.CompositeKey]
if !ok {
r = QueryRange{Key: c.CompositeKey}
}
switch c.Op {
case query.OpGreater:
r.LowerBound = c.Operand
case query.OpGreaterEqual:
r.IncludeLowerBound = true
r.LowerBound = c.Operand
case query.OpLess:
r.UpperBound = c.Operand
case query.OpLessEqual:
r.IncludeUpperBound = true
r.UpperBound = c.Operand
}
ranges[c.CompositeKey] = r
indexes = append(indexes, i)
}
}
return ranges, indexes
}
// IsRangeOperation returns a boolean signifying if a query Operator is a range
// operation or not.
func IsRangeOperation(op query.Operator) bool {
switch op {
case query.OpGreater, query.OpGreaterEqual, query.OpLess, query.OpLessEqual:
return true
default:
return false
}
}