ipld-eth-server/examples/erc20_watcher/event_triggered/converter.go

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// Copyright 2018 Vulcanize
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package event_triggered
import (
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/vulcanize/vulcanizedb/examples/generic"
"github.com/vulcanize/vulcanizedb/examples/generic/helpers"
"github.com/vulcanize/vulcanizedb/pkg/core"
)
// 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) TransferModel
ToApprovalEntity(watchedEvent core.WatchedEvent) (*ApprovalEntity, error)
ToApprovalModel(entity ApprovalEntity) ApprovalModel
}
type ERC20Converter struct {
config generic.ContractConfig
}
func NewERC20Converter(config generic.ContractConfig) ERC20Converter {
return ERC20Converter{
config: config,
}
}
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, "Transfer", 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(transferEntity TransferEntity) TransferModel {
to := transferEntity.Dst.String()
from := transferEntity.Src.String()
tokens := transferEntity.Wad.String()
block := transferEntity.Block
tx := transferEntity.TxHash
return TransferModel{
TokenName: c.config.Name,
TokenAddress: c.config.Address,
To: to,
From: from,
Tokens: tokens,
Block: block,
TxHash: tx,
}
}
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, "Approval", 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(TransferEntity ApprovalEntity) ApprovalModel {
tokenOwner := TransferEntity.Src.String()
spender := TransferEntity.Guy.String()
tokens := TransferEntity.Wad.String()
block := TransferEntity.Block
tx := TransferEntity.TxHash
return ApprovalModel{
TokenName: c.config.Name,
TokenAddress: c.config.Address,
Owner: tokenOwner,
Spender: spender,
Tokens: tokens,
Block: block,
TxHash: tx,
}
}