ipld-eth-server/pkg/omni/converter/converter.go

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// VulcanizeDB
// Copyright © 2018 Vulcanize
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program 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 Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package converter
import (
"errors"
"math/big"
"strconv"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/vulcanize/vulcanizedb/pkg/core"
"github.com/vulcanize/vulcanizedb/pkg/omni/contract"
"github.com/vulcanize/vulcanizedb/pkg/omni/helpers"
"github.com/vulcanize/vulcanizedb/pkg/omni/types"
)
// Converter is used to convert watched event logs to
// custom logs containing event input name => value maps
type Converter interface {
Convert(watchedEvent core.WatchedEvent, event *types.Event) error
Update(info *contract.Contract)
}
type converter struct {
contractInfo *contract.Contract
}
func NewConverter(info *contract.Contract) *converter {
return &converter{
contractInfo: info,
}
}
func (c *converter) Update(info *contract.Contract) {
c.contractInfo = info
}
func (c *converter) CheckInfo() *contract.Contract {
return c.contractInfo
}
// Convert the given watched event log into a types.Log for the given event
func (c *converter) Convert(watchedEvent core.WatchedEvent, event *types.Event) error {
contract := bind.NewBoundContract(common.HexToAddress(c.contractInfo.Address), c.contractInfo.ParsedAbi, nil, nil, nil)
values := make(map[string]interface{})
for _, field := range event.Fields {
var i interface{}
values[field.Name] = i
}
log := helpers.ConvertToLog(watchedEvent)
err := contract.UnpackLogIntoMap(values, event.Name, log)
if err != nil {
return err
}
strValues := make(map[string]string, len(values))
for eventName, input := range values {
// Postgres cannot handle custom types, resolve to strings
switch input.(type) {
case *big.Int:
var b *big.Int
b = input.(*big.Int)
strValues[eventName] = b.String()
case common.Address:
var a common.Address
a = input.(common.Address)
strValues[eventName] = a.String()
c.contractInfo.AddTokenHolderAddress(a.String()) // cache address in a list of contract's token holder addresses
case common.Hash:
var h common.Hash
h = input.(common.Hash)
strValues[eventName] = h.String()
case string:
strValues[eventName] = input.(string)
case bool:
strValues[eventName] = strconv.FormatBool(input.(bool))
default:
return errors.New("error: unhandled abi type")
}
}
// Only hold onto logs that pass our address filter, if any
// Persist log here and don't hold onto it
if c.contractInfo.PassesEventFilter(strValues) {
eventLog := types.Log{
Id: watchedEvent.LogID,
Values: strValues,
Block: watchedEvent.BlockNumber,
Tx: watchedEvent.TxHash,
}
event.Logs[watchedEvent.LogID] = eventLog
}
return nil
}