118 lines
3.2 KiB
Go
118 lines
3.2 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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"log"
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"math/big"
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"github.com/vulcanize/vulcanizedb/examples/erc20_watcher"
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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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"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
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)
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type Transformer struct {
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Fetcher ERC20FetcherInterface
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Repository ERC20RepositoryInterface
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Config erc20_watcher.ContractConfig
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}
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func (t *Transformer) SetConfiguration(config erc20_watcher.ContractConfig) {
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t.Config = config
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}
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type TokenSupplyTransformerInitializer struct {
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Config erc20_watcher.ContractConfig
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}
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func (i TokenSupplyTransformerInitializer) NewTokenSupplyTransformer(db *postgres.DB, blockchain core.BlockChain) shared.Transformer {
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fetcher := NewFetcher(blockchain)
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repository := TokenSupplyRepository{DB: db}
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transformer := Transformer{
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Fetcher: &fetcher,
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Repository: &repository,
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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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)
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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.Fetcher.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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blocks, err := t.Repository.MissingBlocks(t.Config.FirstBlock, upperBoundBlock)
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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 totalSupply for %d blocks", len(blocks))
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for _, blockNumber := range blocks {
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totalSupply, err := t.Fetcher.FetchSupplyOf(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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model := createTokenSupplyModel(totalSupply, t.Config.Address, blockNumber)
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err = t.Repository.Create(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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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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