101 lines
3.1 KiB
Go
101 lines
3.1 KiB
Go
// VulcanizeDB
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// Copyright © 2019 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package retriever
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import (
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"database/sql"
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"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
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"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
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)
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// Block retriever is used to retrieve the first block for a given contract and the most recent block
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// It requires a vDB synced database with blocks, transactions, receipts, and logs
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type BlockRetriever interface {
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RetrieveFirstBlock(contractAddr string) (int64, error)
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RetrieveMostRecentBlock() (int64, error)
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}
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type blockRetriever struct {
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db *postgres.DB
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}
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func NewBlockRetriever(db *postgres.DB) (r *blockRetriever) {
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return &blockRetriever{
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db: db,
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}
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}
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// Try both methods of finding the first block, with the receipt method taking precedence
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func (r *blockRetriever) RetrieveFirstBlock(contractAddr string) (int64, error) {
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i, err := r.retrieveFirstBlockFromReceipts(contractAddr)
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if err != nil {
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if err == sql.ErrNoRows {
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i, err = r.retrieveFirstBlockFromLogs(contractAddr)
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}
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return i, err
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}
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return i, err
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}
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// For some contracts the contract creation transaction receipt doesn't have the contract address so this doesn't work (e.g. Sai)
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func (r *blockRetriever) retrieveFirstBlockFromReceipts(contractAddr string) (int64, error) {
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var firstBlock int64
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addressId, getAddressErr := addressRepository().GetOrCreateAddress(r.db, contractAddr)
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if getAddressErr != nil {
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return firstBlock, getAddressErr
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}
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err := r.db.Get(
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&firstBlock,
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`SELECT number FROM blocks
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WHERE id = (SELECT block_id FROM full_sync_receipts
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WHERE contract_address_id = $1
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ORDER BY block_id ASC
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LIMIT 1)`,
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addressId,
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)
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return firstBlock, err
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}
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func addressRepository() repositories.AddressRepository {
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return repositories.AddressRepository{}
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}
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// In which case this servers as a heuristic to find the first block by finding the first contract event log
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func (r *blockRetriever) retrieveFirstBlockFromLogs(contractAddr string) (int64, error) {
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var firstBlock int
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err := r.db.Get(
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&firstBlock,
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"SELECT block_number FROM full_sync_logs WHERE lower(address) = $1 ORDER BY block_number ASC LIMIT 1",
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contractAddr,
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)
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return int64(firstBlock), err
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}
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// Method to retrieve the most recent block in vDB
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func (r *blockRetriever) RetrieveMostRecentBlock() (int64, error) {
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var lastBlock int64
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err := r.db.Get(
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&lastBlock,
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"SELECT number FROM blocks ORDER BY number DESC LIMIT 1",
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)
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return lastBlock, err
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}
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