417b18ec6a
towards generic method polling and reposito;y; config settings to filterevents/methods by account address; refactoring some stuff out of repo and into converter; remove fetcher and instead call blockchain's FetchContractData directly; finishing tests
117 lines
3.3 KiB
Go
117 lines
3.3 KiB
Go
// VulcanizeDB
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// Copyright © 2018 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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"errors"
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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/vulcanize/vulcanizedb/pkg/core"
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"github.com/vulcanize/vulcanizedb/pkg/omni/contract"
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"github.com/vulcanize/vulcanizedb/pkg/omni/helpers"
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"github.com/vulcanize/vulcanizedb/pkg/omni/types"
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)
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// Converter 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 Converter interface {
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Convert(watchedEvent core.WatchedEvent, event *types.Event) error
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Update(info *contract.Contract)
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}
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type converter struct {
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contractInfo *contract.Contract
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}
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func NewConverter(info *contract.Contract) *converter {
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return &converter{
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contractInfo: info,
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}
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}
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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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func (c *converter) CheckInfo() *contract.Contract {
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return c.contractInfo
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}
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// Convert 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) error {
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contract := 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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for _, field := range event.Fields {
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var i interface{}
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values[field.Name] = i
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}
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log := helpers.ConvertToLog(watchedEvent)
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err := contract.UnpackLogIntoMap(values, event.Name, log)
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if err != nil {
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return err
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}
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strValues := make(map[string]string, len(values))
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for eventName, 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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var b *big.Int
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b = input.(*big.Int)
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strValues[eventName] = b.String()
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case common.Address:
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var a common.Address
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a = input.(common.Address)
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strValues[eventName] = a.String()
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c.contractInfo.AddTokenHolderAddress(a.String()) // cache address in a list of contract's token holder addresses
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case common.Hash:
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var h common.Hash
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h = input.(common.Hash)
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strValues[eventName] = h.String()
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case string:
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strValues[eventName] = input.(string)
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case bool:
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strValues[eventName] = strconv.FormatBool(input.(bool))
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default:
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return errors.New("error: unhandled abi type")
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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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// Persist log here and don't hold onto it
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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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event.Logs[watchedEvent.LogID] = eventLog
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}
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return nil
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}
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