forked from cerc-io/ipld-eth-server
107 lines
3.0 KiB
Go
107 lines
3.0 KiB
Go
// VulcanizeDB
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// Copyright © 2019 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package utils
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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)
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const (
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bitsPerByte = 8
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)
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func Decode(diff StorageDiff, metadata StorageValueMetadata) (interface{}, error) {
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switch metadata.Type {
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case Uint256:
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return decodeInteger(diff.StorageValue.Bytes()), nil
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case Uint48:
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return decodeInteger(diff.StorageValue.Bytes()), nil
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case Uint128:
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return decodeInteger(diff.StorageValue.Bytes()), nil
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case Address:
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return decodeAddress(diff.StorageValue.Bytes()), nil
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case Bytes32:
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return diff.StorageValue.Hex(), nil
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case PackedSlot:
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return decodePackedSlot(diff.StorageValue.Bytes(), metadata.PackedTypes), nil
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default:
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panic(fmt.Sprintf("can't decode unknown type: %d", metadata.Type))
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}
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}
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func decodeInteger(raw []byte) string {
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n := big.NewInt(0).SetBytes(raw)
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return n.String()
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}
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func decodeAddress(raw []byte) string {
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return common.BytesToAddress(raw).Hex()
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}
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func decodePackedSlot(raw []byte, packedTypes map[int]ValueType) map[int]string {
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storageSlotData := raw
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decodedStorageSlotItems := map[int]string{}
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numberOfTypes := len(packedTypes)
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for position := 0; position < numberOfTypes; position++ {
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//get length of remaining storage date
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lengthOfStorageData := len(storageSlotData)
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//get item details (type, length, starting index, value bytes)
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itemType := packedTypes[position]
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lengthOfItem := getNumberOfBytes(itemType)
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itemStartingIndex := lengthOfStorageData - lengthOfItem
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itemValueBytes := storageSlotData[itemStartingIndex:]
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//decode item's bytes and set in results map
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decodedValue := decodeIndividualItem(itemValueBytes, itemType)
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decodedStorageSlotItems[position] = decodedValue
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//pop last item off raw slot data before moving on
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storageSlotData = storageSlotData[0:itemStartingIndex]
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}
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return decodedStorageSlotItems
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}
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func decodeIndividualItem(itemBytes []byte, valueType ValueType) string {
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switch valueType {
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case Uint48, Uint128:
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return decodeInteger(itemBytes)
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case Address:
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return decodeAddress(itemBytes)
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default:
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panic(fmt.Sprintf("can't decode unknown type: %d", valueType))
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}
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}
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func getNumberOfBytes(valueType ValueType) int {
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switch valueType {
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case Uint48:
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return 48 / bitsPerByte
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case Uint128:
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return 128 / bitsPerByte
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case Address:
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return 20
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default:
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panic(fmt.Sprintf("ValueType %d not recognized", valueType))
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}
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}
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