ipld-eth-server/examples/erc20_watcher/event_triggered/dai/converter.go
Ian Norden 417b18ec6a Edits to address PR issues; change license from apache to AGPL; and work
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
2018-11-15 12:32:52 -06:00

123 lines
3.9 KiB
Go

// 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 dai
import (
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/vulcanize/vulcanizedb/examples/erc20_watcher/event_triggered"
"github.com/vulcanize/vulcanizedb/libraries/shared"
"github.com/vulcanize/vulcanizedb/pkg/core"
"github.com/vulcanize/vulcanizedb/pkg/geth"
"github.com/vulcanize/vulcanizedb/pkg/omni/constants"
"github.com/vulcanize/vulcanizedb/pkg/omni/helpers"
)
// Converter converts a raw event log into its corresponding entity
// and can subsequently convert the entity into a model
type ERC20ConverterInterface interface {
ToTransferEntity(watchedEvent core.WatchedEvent) (*TransferEntity, error)
ToTransferModel(entity *TransferEntity) *event_triggered.TransferModel
ToApprovalEntity(watchedEvent core.WatchedEvent) (*ApprovalEntity, error)
ToApprovalModel(entity *ApprovalEntity) *event_triggered.ApprovalModel
}
type ERC20Converter struct {
config shared.ContractConfig
}
func NewERC20Converter(config shared.ContractConfig) (*ERC20Converter, error) {
var err error
config.ParsedAbi, err = geth.ParseAbi(config.Abi)
if err != nil {
return nil, err
}
converter := &ERC20Converter{
config: config,
}
return converter, nil
}
func (c ERC20Converter) ToTransferEntity(watchedEvent core.WatchedEvent) (*TransferEntity, error) {
result := &TransferEntity{}
contract := bind.NewBoundContract(common.HexToAddress(c.config.Address), c.config.ParsedAbi, nil, nil, nil)
event := helpers.ConvertToLog(watchedEvent)
err := contract.UnpackLog(result, constants.TransferEvent.String(), event)
if err != nil {
return result, err
}
result.TokenName = c.config.Name
result.TokenAddress = common.HexToAddress(c.config.Address)
result.Block = watchedEvent.BlockNumber
result.TxHash = watchedEvent.TxHash
return result, nil
}
func (c ERC20Converter) ToTransferModel(entity *TransferEntity) *event_triggered.TransferModel {
to := entity.Dst.String()
from := entity.Src.String()
tokens := entity.Wad.String()
return &event_triggered.TransferModel{
TokenName: c.config.Name,
TokenAddress: c.config.Address,
To: to,
From: from,
Tokens: tokens,
Block: entity.Block,
TxHash: entity.TxHash,
}
}
func (c ERC20Converter) ToApprovalEntity(watchedEvent core.WatchedEvent) (*ApprovalEntity, error) {
result := &ApprovalEntity{}
contract := bind.NewBoundContract(common.HexToAddress(c.config.Address), c.config.ParsedAbi, nil, nil, nil)
event := helpers.ConvertToLog(watchedEvent)
err := contract.UnpackLog(result, constants.ApprovalEvent.String(), event)
if err != nil {
return result, err
}
result.TokenName = c.config.Name
result.TokenAddress = common.HexToAddress(c.config.Address)
result.Block = watchedEvent.BlockNumber
result.TxHash = watchedEvent.TxHash
return result, nil
}
func (c ERC20Converter) ToApprovalModel(entity *ApprovalEntity) *event_triggered.ApprovalModel {
tokenOwner := entity.Src.String()
spender := entity.Guy.String()
tokens := entity.Wad.String()
return &event_triggered.ApprovalModel{
TokenName: c.config.Name,
TokenAddress: c.config.Address,
Owner: tokenOwner,
Spender: spender,
Tokens: tokens,
Block: entity.Block,
TxHash: entity.TxHash,
}
}