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indexer_service.go
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/
indexer_service.go
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package server
import (
"context"
"time"
"github.com/tendermint/tendermint/libs/service"
rpcclient "github.com/tendermint/tendermint/rpc/client"
"github.com/tendermint/tendermint/types"
ethermint "github.com/cerc-io/laconicd/types"
)
const (
ServiceName = "EVMIndexerService"
NewBlockWaitTimeout = 60 * time.Second
)
// EVMIndexerService indexes transactions for json-rpc service.
type EVMIndexerService struct {
service.BaseService
txIdxr ethermint.EVMTxIndexer
client rpcclient.Client
}
// NewEVMIndexerService returns a new service instance.
func NewEVMIndexerService(
txIdxr ethermint.EVMTxIndexer,
client rpcclient.Client,
) *EVMIndexerService {
is := &EVMIndexerService{txIdxr: txIdxr, client: client}
is.BaseService = *service.NewBaseService(nil, ServiceName, is)
return is
}
// OnStart implements service.Service by subscribing for new blocks
// and indexing them by events.
func (eis *EVMIndexerService) OnStart() error {
ctx := context.Background()
status, err := eis.client.Status(ctx)
if err != nil {
return err
}
latestBlock := status.SyncInfo.LatestBlockHeight
newBlockSignal := make(chan struct{}, 1)
// Use SubscribeUnbuffered here to ensure both subscriptions does not get
// canceled due to not pulling messages fast enough. Cause this might
// sometimes happen when there are no other subscribers.
blockHeadersChan, err := eis.client.Subscribe(
ctx,
ServiceName,
types.QueryForEvent(types.EventNewBlockHeader).String(),
0)
if err != nil {
return err
}
go func() {
for {
msg := <-blockHeadersChan
eventDataHeader := msg.Data.(types.EventDataNewBlockHeader)
if eventDataHeader.Header.Height > latestBlock {
latestBlock = eventDataHeader.Header.Height
// notify
select {
case newBlockSignal <- struct{}{}:
default:
}
}
}
}()
lastBlock, err := eis.txIdxr.LastIndexedBlock()
if err != nil {
return err
}
if lastBlock == -1 {
lastBlock = latestBlock
}
for {
if latestBlock <= lastBlock {
// nothing to index. wait for signal of new block
select {
case <-newBlockSignal:
case <-time.After(NewBlockWaitTimeout):
}
continue
}
for i := lastBlock + 1; i <= latestBlock; i++ {
block, err := eis.client.Block(ctx, &i)
if err != nil {
eis.Logger.Error("failed to fetch block", "height", i, "err", err)
break
}
blockResult, err := eis.client.BlockResults(ctx, &i)
if err != nil {
eis.Logger.Error("failed to fetch block result", "height", i, "err", err)
break
}
if err := eis.txIdxr.IndexBlock(block.Block, blockResult.TxsResults); err != nil {
eis.Logger.Error("failed to index block", "height", i, "err", err)
}
lastBlock = blockResult.Height
}
}
}