100 lines
1.9 KiB
Go
100 lines
1.9 KiB
Go
package storm
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import (
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"bytes"
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"github.com/coreos/bbolt"
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)
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// A BucketScanner scans a Node for a list of buckets
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type BucketScanner interface {
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// PrefixScan scans the root buckets for keys matching the given prefix.
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PrefixScan(prefix string) []Node
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// PrefixScan scans the buckets in this node for keys matching the given prefix.
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RangeScan(min, max string) []Node
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}
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// PrefixScan scans the buckets in this node for keys matching the given prefix.
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func (n *node) PrefixScan(prefix string) []Node {
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if n.tx != nil {
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return n.prefixScan(n.tx, prefix)
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}
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var nodes []Node
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n.readTx(func(tx *bolt.Tx) error {
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nodes = n.prefixScan(tx, prefix)
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return nil
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})
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return nodes
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}
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func (n *node) prefixScan(tx *bolt.Tx, prefix string) []Node {
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var (
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prefixBytes = []byte(prefix)
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nodes []Node
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c = n.cursor(tx)
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)
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for k, v := c.Seek(prefixBytes); k != nil && bytes.HasPrefix(k, prefixBytes); k, v = c.Next() {
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if v != nil {
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continue
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}
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nodes = append(nodes, n.From(string(k)))
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}
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return nodes
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}
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// RangeScan scans the buckets in this node over a range such as a sortable time range.
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func (n *node) RangeScan(min, max string) []Node {
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if n.tx != nil {
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return n.rangeScan(n.tx, min, max)
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}
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var nodes []Node
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n.readTx(func(tx *bolt.Tx) error {
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nodes = n.rangeScan(tx, min, max)
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return nil
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})
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return nodes
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}
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func (n *node) rangeScan(tx *bolt.Tx, min, max string) []Node {
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var (
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minBytes = []byte(min)
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maxBytes = []byte(max)
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nodes []Node
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c = n.cursor(tx)
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)
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for k, v := c.Seek(minBytes); k != nil && bytes.Compare(k, maxBytes) <= 0; k, v = c.Next() {
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if v != nil {
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continue
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}
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nodes = append(nodes, n.From(string(k)))
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}
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return nodes
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}
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func (n *node) cursor(tx *bolt.Tx) *bolt.Cursor {
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var c *bolt.Cursor
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if len(n.rootBucket) > 0 {
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c = n.GetBucket(tx).Cursor()
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} else {
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c = tx.Cursor()
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}
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return c
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}
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