118 lines
3.8 KiB
Go
118 lines
3.8 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 converter
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import (
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"fmt"
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"math/big"
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"strconv"
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"github.com/ethereum/go-ethereum/accounts/abi/bind"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/contract"
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"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/helpers"
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"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/types"
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"github.com/vulcanize/vulcanizedb/pkg/core"
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)
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// ConverterInterface is used to convert watched event logs to
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// custom logs containing event input name => value maps
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type ConverterInterface interface {
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Convert(watchedEvent core.WatchedEvent, event types.Event) (*types.Log, error)
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Update(info *contract.Contract)
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}
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// Converter is the underlying struct for the ConverterInterface
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type Converter struct {
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ContractInfo *contract.Contract
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}
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// Update configures the converter for a specific contract
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func (c *Converter) Update(info *contract.Contract) {
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c.ContractInfo = info
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}
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// Convert converts the given watched event log into a types.Log for the given event
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func (c *Converter) Convert(watchedEvent core.WatchedEvent, event types.Event) (*types.Log, error) {
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boundContract := bind.NewBoundContract(common.HexToAddress(c.ContractInfo.Address), c.ContractInfo.ParsedAbi, nil, nil, nil)
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values := make(map[string]interface{})
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log := helpers.ConvertToLog(watchedEvent)
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err := boundContract.UnpackLogIntoMap(values, event.Name, log)
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if err != nil {
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return nil, err
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}
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strValues := make(map[string]string, len(values))
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seenAddrs := make([]interface{}, 0, len(values))
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seenHashes := make([]interface{}, 0, len(values))
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for fieldName, input := range values {
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// Postgres cannot handle custom types, resolve to strings
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switch input.(type) {
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case *big.Int:
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b := input.(*big.Int)
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strValues[fieldName] = b.String()
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case common.Address:
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a := input.(common.Address)
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strValues[fieldName] = a.String()
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seenAddrs = append(seenAddrs, a)
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case common.Hash:
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h := input.(common.Hash)
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strValues[fieldName] = h.String()
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seenHashes = append(seenHashes, h)
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case string:
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strValues[fieldName] = input.(string)
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case bool:
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strValues[fieldName] = strconv.FormatBool(input.(bool))
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case []byte:
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b := input.([]byte)
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strValues[fieldName] = hexutil.Encode(b)
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if len(b) == 32 { // collect byte arrays of size 32 as hashes
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seenHashes = append(seenHashes, common.HexToHash(strValues[fieldName]))
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}
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case byte:
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b := input.(byte)
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strValues[fieldName] = string(b)
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default:
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return nil, fmt.Errorf("error: unhandled abi type %T", input)
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}
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}
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// Only hold onto logs that pass our address filter, if any
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if c.ContractInfo.PassesEventFilter(strValues) {
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eventLog := &types.Log{
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ID: watchedEvent.LogID,
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Values: strValues,
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Block: watchedEvent.BlockNumber,
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Tx: watchedEvent.TxHash,
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}
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// Cache emitted values if their caching is turned on
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if c.ContractInfo.EmittedAddrs != nil {
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c.ContractInfo.AddEmittedAddr(seenAddrs...)
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}
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if c.ContractInfo.EmittedHashes != nil {
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c.ContractInfo.AddEmittedHash(seenHashes...)
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}
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return eventLog, nil
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}
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return nil, nil
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}
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