ipld-eth-server/libraries/shared/event_watcher.go

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// VulcanizeDB
// Copyright © 2018 Vulcanize
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package shared
import (
"fmt"
"github.com/ethereum/go-ethereum/common"
log "github.com/sirupsen/logrus"
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"github.com/vulcanize/vulcanizedb/pkg/core"
"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
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"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
"github.com/vulcanize/vulcanizedb/pkg/transformers/shared/constants"
)
type EventWatcher struct {
Transformers []shared.Transformer
DB *postgres.DB
Fetcher shared.LogFetcher
Chunker shared.Chunker
Addresses []common.Address
Topics []common.Hash
StartingBlock *int64
}
func NewEventWatcher(db *postgres.DB, bc core.BlockChain) EventWatcher {
chunker := shared.NewLogChunker()
fetcher := shared.NewFetcher(bc)
return EventWatcher{
DB: db,
Fetcher: fetcher,
Chunker: chunker,
}
}
// Adds transformers to the watcher and updates the chunker, so that it will consider the new transformers.
func (watcher *EventWatcher) AddTransformers(initializers []shared.TransformerInitializer) {
var contractAddresses []common.Address
var topic0s []common.Hash
var configs []shared.TransformerConfig
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for _, initializer := range initializers {
transformer := initializer(watcher.DB)
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watcher.Transformers = append(watcher.Transformers, transformer)
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config := transformer.GetConfig()
configs = append(configs, config)
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if watcher.StartingBlock == nil {
watcher.StartingBlock = &config.StartingBlockNumber
} else if earlierStartingBlockNumber(config.StartingBlockNumber, *watcher.StartingBlock) {
watcher.StartingBlock = &config.StartingBlockNumber
}
addresses := shared.HexStringsToAddresses(config.ContractAddresses)
contractAddresses = append(contractAddresses, addresses...)
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topic0s = append(topic0s, common.HexToHash(config.Topic))
}
watcher.Addresses = append(watcher.Addresses, contractAddresses...)
watcher.Topics = append(watcher.Topics, topic0s...)
watcher.Chunker.AddConfigs(configs)
}
func (watcher *EventWatcher) Execute(recheckHeaders constants.TransformerExecution) error {
if watcher.Transformers == nil {
return fmt.Errorf("No transformers added to watcher")
}
checkedColumnNames, err := shared.GetCheckedColumnNames(watcher.DB)
if err != nil {
return err
}
notCheckedSQL := shared.CreateNotCheckedSQL(checkedColumnNames, recheckHeaders)
missingHeaders, err := shared.MissingHeaders(*watcher.StartingBlock, -1, watcher.DB, notCheckedSQL)
if err != nil {
log.Error("Fetching of missing headers failed in watcher!")
return err
}
for _, header := range missingHeaders {
// TODO Extend FetchLogs for doing several blocks at a time
logs, err := watcher.Fetcher.FetchLogs(watcher.Addresses, watcher.Topics, header)
if err != nil {
// TODO Handle fetch error in watcher
log.Errorf("Error while fetching logs for header %v in watcher", header.Id)
return err
}
chunkedLogs := watcher.Chunker.ChunkLogs(logs)
// Can't quit early and mark as checked if there are no logs. If we are running continuousLogSync,
// not all logs we're interested in might have been fetched.
for _, transformer := range watcher.Transformers {
transformerName := transformer.GetConfig().TransformerName
logChunk := chunkedLogs[transformerName]
err = transformer.Execute(logChunk, header, constants.HeaderMissing)
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if err != nil {
log.Errorf("%v transformer failed to execute in watcher: %v", transformerName, err)
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return err
}
}
}
return err
}
func earlierStartingBlockNumber(transformerBlock, watcherBlock int64) bool {
return transformerBlock < watcherBlock
}