125 lines
3.5 KiB
Go
125 lines
3.5 KiB
Go
// Copyright 2021 Evmos Foundation
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// This file is part of Evmos' Ethermint library.
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//
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// The Ethermint library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser 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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//
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// The Ethermint library 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 Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the Ethermint library. If not, see https://github.com/evmos/ethermint/blob/main/LICENSE
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package server
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import (
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"context"
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"time"
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"github.com/tendermint/tendermint/libs/service"
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rpcclient "github.com/tendermint/tendermint/rpc/client"
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"github.com/tendermint/tendermint/types"
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ethermint "github.com/evmos/ethermint/types"
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)
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const (
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ServiceName = "EVMIndexerService"
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NewBlockWaitTimeout = 60 * time.Second
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)
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// EVMIndexerService indexes transactions for json-rpc service.
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type EVMIndexerService struct {
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service.BaseService
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txIdxr ethermint.EVMTxIndexer
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client rpcclient.Client
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}
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// NewEVMIndexerService returns a new service instance.
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func NewEVMIndexerService(
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txIdxr ethermint.EVMTxIndexer,
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client rpcclient.Client,
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) *EVMIndexerService {
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is := &EVMIndexerService{txIdxr: txIdxr, client: client}
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is.BaseService = *service.NewBaseService(nil, ServiceName, is)
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return is
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}
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// OnStart implements service.Service by subscribing for new blocks
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// and indexing them by events.
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func (eis *EVMIndexerService) OnStart() error {
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ctx := context.Background()
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status, err := eis.client.Status(ctx)
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if err != nil {
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return err
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}
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latestBlock := status.SyncInfo.LatestBlockHeight
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newBlockSignal := make(chan struct{}, 1)
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// Use SubscribeUnbuffered here to ensure both subscriptions does not get
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// canceled due to not pulling messages fast enough. Cause this might
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// sometimes happen when there are no other subscribers.
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blockHeadersChan, err := eis.client.Subscribe(
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ctx,
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ServiceName,
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types.QueryForEvent(types.EventNewBlockHeader).String(),
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0)
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if err != nil {
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return err
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}
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go func() {
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for {
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msg := <-blockHeadersChan
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eventDataHeader := msg.Data.(types.EventDataNewBlockHeader)
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if eventDataHeader.Header.Height > latestBlock {
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latestBlock = eventDataHeader.Header.Height
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// notify
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select {
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case newBlockSignal <- struct{}{}:
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default:
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}
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}
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}
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}()
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lastBlock, err := eis.txIdxr.LastIndexedBlock()
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if err != nil {
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return err
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}
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if lastBlock == -1 {
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lastBlock = latestBlock
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}
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for {
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if latestBlock <= lastBlock {
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// nothing to index. wait for signal of new block
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select {
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case <-newBlockSignal:
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case <-time.After(NewBlockWaitTimeout):
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}
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continue
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}
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for i := lastBlock + 1; i <= latestBlock; i++ {
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block, err := eis.client.Block(ctx, &i)
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if err != nil {
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eis.Logger.Error("failed to fetch block", "height", i, "err", err)
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break
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}
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blockResult, err := eis.client.BlockResults(ctx, &i)
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if err != nil {
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eis.Logger.Error("failed to fetch block result", "height", i, "err", err)
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break
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}
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if err := eis.txIdxr.IndexBlock(block.Block, blockResult.TxsResults); err != nil {
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eis.Logger.Error("failed to index block", "height", i, "err", err)
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}
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lastBlock = blockResult.Height
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}
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}
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}
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