240 lines
7.5 KiB
Go
240 lines
7.5 KiB
Go
// Copyright 2018 Vulcanize
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package every_block
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import (
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"fmt"
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"github.com/ethereum/go-ethereum/common"
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"github.com/vulcanize/vulcanizedb/examples/generic"
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"github.com/vulcanize/vulcanizedb/libraries/shared"
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"github.com/vulcanize/vulcanizedb/pkg/core"
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"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
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"log"
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"math/big"
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)
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type Transformer struct {
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Getter ERC20GetterInterface
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Repository ERC20RepositoryInterface
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Retriever generic.Retriever
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Config generic.ContractConfig
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}
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func (t *Transformer) SetConfiguration(config generic.ContractConfig) {
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t.Config = config
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}
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type ERC20TokenTransformerInitializer struct {
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Config generic.ContractConfig
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}
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func (i ERC20TokenTransformerInitializer) NewERC20TokenTransformer(db *postgres.DB, blockchain core.BlockChain) shared.Transformer {
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getter := NewGetter(blockchain)
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repository := ERC20TokenRepository{DB: db}
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retriever := generic.NewRetriever(db, i.Config.Address)
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transformer := Transformer{
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Getter: &getter,
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Repository: &repository,
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Retriever: retriever,
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Config: i.Config,
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}
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return transformer
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}
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const (
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FetchingBlocksError = "Error fetching missing blocks starting at block number %d: %s"
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FetchingSupplyError = "Error fetching supply for block %d: %s"
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CreateSupplyError = "Error inserting token_supply for block %d: %s"
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FetchingTokenAddressesError = "Error fetching token holder addresses at block %d: %s"
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FetchingBalanceError = "Error fetching balance at block %d: %s"
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CreateBalanceError = "Error inserting token_balance at block %d: %s"
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FetchingAllowanceError = "Error fetching allowance at block %d: %s"
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CreateAllowanceError = "Error inserting allowance at block %d: %s"
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)
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type transformerError struct {
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err string
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blockNumber int64
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msg string
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}
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func (te *transformerError) Error() string {
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return fmt.Sprintf(te.msg, te.blockNumber, te.err)
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}
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func newTransformerError(err error, blockNumber int64, msg string) error {
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e := transformerError{err.Error(), blockNumber, msg}
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log.Println(e.Error())
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return &e
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}
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func (t Transformer) Execute() error {
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var upperBoundBlock int64
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blockchain := t.Getter.GetBlockChain()
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lastBlock := blockchain.LastBlock().Int64()
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if t.Config.LastBlock == -1 {
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upperBoundBlock = lastBlock
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} else {
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upperBoundBlock = t.Config.LastBlock
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}
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// Supply transformations:
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// Fetch missing supply blocks
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blocks, err := t.Repository.MissingSupplyBlocks(t.Config.FirstBlock, upperBoundBlock, t.Config.Address)
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if err != nil {
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return newTransformerError(err, t.Config.FirstBlock, FetchingBlocksError)
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}
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// Fetch supply for missing blocks
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log.Printf("Fetching totalSupply for %d blocks", len(blocks))
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// For each block missing total supply, create supply model and feed the missing data into the repository
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for _, blockNumber := range blocks {
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totalSupply, err := t.Getter.GetTotalSupply(t.Config.Abi, t.Config.Address, blockNumber)
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if err != nil {
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return newTransformerError(err, blockNumber, FetchingSupplyError)
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}
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// Create the supply model
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model := createTokenSupplyModel(totalSupply, t.Config.Address, blockNumber)
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// Feed it into the repository
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err = t.Repository.CreateSupply(model)
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if err != nil {
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return newTransformerError(err, blockNumber, CreateSupplyError)
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}
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}
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// Balance and allowance transformations:
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// Retrieve all token holder addresses for the given contract configuration
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tokenHolderAddresses, err := t.Retriever.RetrieveContractAssociatedAddresses()
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if err != nil {
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return newTransformerError(err, t.Config.FirstBlock, FetchingTokenAddressesError)
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}
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// Iterate over the addresses and add their balances and allowances at each block height to the repository
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for holderAddr := range tokenHolderAddresses {
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// Balance transformations:
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blocks, err := t.Repository.MissingBalanceBlocks(t.Config.FirstBlock, upperBoundBlock, t.Config.Address, holderAddr.String())
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if err != nil {
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return newTransformerError(err, t.Config.FirstBlock, FetchingBlocksError)
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}
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log.Printf("Fetching balances for %d blocks", len(blocks))
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// For each block missing balances for the given address, create a balance model and feed the missing data into the repository
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for _, blockNumber := range blocks {
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hashArgs := []common.Address{holderAddr}
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balanceOfArgs := make([]interface{}, len(hashArgs))
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for i, s := range hashArgs {
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balanceOfArgs[i] = s
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}
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totalSupply, err := t.Getter.GetBalance(t.Config.Abi, t.Config.Address, blockNumber, balanceOfArgs)
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if err != nil {
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return newTransformerError(err, blockNumber, FetchingBalanceError)
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}
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model := createTokenBalanceModel(totalSupply, t.Config.Address, blockNumber, holderAddr.String())
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err = t.Repository.CreateBalance(model)
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if err != nil {
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return newTransformerError(err, blockNumber, CreateBalanceError)
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}
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}
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// Allowance transformations:
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for spenderAddr := range tokenHolderAddresses {
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blocks, err := t.Repository.MissingAllowanceBlocks(t.Config.FirstBlock, upperBoundBlock, t.Config.Address, holderAddr.String(), spenderAddr.String())
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if err != nil {
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return newTransformerError(err, t.Config.FirstBlock, FetchingBlocksError)
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}
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log.Printf("Fetching allowances for %d blocks", len(blocks))
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// For each block missing allowances for the given holder and spender addresses, create a allowance model and feed the missing data into the repository
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for _, blockNumber := range blocks {
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hashArgs := []common.Address{holderAddr, spenderAddr}
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allowanceArgs := make([]interface{}, len(hashArgs))
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for i, s := range hashArgs {
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allowanceArgs[i] = s
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}
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totalSupply, err := t.Getter.GetAllowance(t.Config.Abi, t.Config.Address, blockNumber, allowanceArgs)
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if err != nil {
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return newTransformerError(err, blockNumber, FetchingAllowanceError)
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}
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model := createTokenAllowanceModel(totalSupply, t.Config.Address, blockNumber, holderAddr.String(), spenderAddr.String())
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err = t.Repository.CreateAllowance(model)
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if err != nil {
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return newTransformerError(err, blockNumber, CreateAllowanceError)
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}
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}
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}
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}
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return nil
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}
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func createTokenSupplyModel(totalSupply big.Int, address string, blockNumber int64) TokenSupply {
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return TokenSupply{
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Value: totalSupply.String(),
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TokenAddress: address,
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BlockNumber: blockNumber,
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}
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}
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func createTokenBalanceModel(tokenBalance big.Int, tokenAddress string, blockNumber int64, tokenHolderAddress string) TokenBalance {
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return TokenBalance{
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Value: tokenBalance.String(),
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TokenAddress: tokenAddress,
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BlockNumber: blockNumber,
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TokenHolderAddress: tokenHolderAddress,
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}
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}
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func createTokenAllowanceModel(tokenBalance big.Int, tokenAddress string, blockNumber int64, tokenHolderAddress, tokenSpenderAddress string) TokenAllowance {
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return TokenAllowance{
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Value: tokenBalance.String(),
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TokenAddress: tokenAddress,
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BlockNumber: blockNumber,
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TokenHolderAddress: tokenHolderAddress,
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TokenSpenderAddress: tokenSpenderAddress,
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}
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}
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