eth-statediff-service/pkg/helpers.go

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// Copyright 2019 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Contains a batch of utility type declarations used by the tests. As the node
// operates on unique types, a lot of them are needed to check various features.
package statediff
import (
"sort"
"strings"
sdtypes "github.com/cerc-io/plugeth-statediff/types"
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)
func sortKeys(data sdtypes.AccountMap) []string {
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keys := make([]string, 0, len(data))
for key := range data {
keys = append(keys, key)
}
sort.Strings(keys)
return keys
}
// findIntersection finds the set of strings from both arrays that are equivalent
// a and b must first be sorted
// this is used to find which keys have been both "deleted" and "created" i.e. they were updated
func findIntersection(a, b []string) []string {
lenA := len(a)
lenB := len(b)
iOfA, iOfB := 0, 0
updates := make([]string, 0)
if iOfA >= lenA || iOfB >= lenB {
return updates
}
for {
switch strings.Compare(a[iOfA], b[iOfB]) {
// -1 when a[iOfA] < b[iOfB]
case -1:
iOfA++
if iOfA >= lenA {
return updates
}
// 0 when a[iOfA] == b[iOfB]
case 0:
updates = append(updates, a[iOfA])
iOfA++
iOfB++
if iOfA >= lenA || iOfB >= lenB {
return updates
}
// 1 when a[iOfA] > b[iOfB]
case 1:
iOfB++
if iOfB >= lenB {
return updates
}
}
}
}