ipld-eth-server/cmd/lightSync.go

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// VulcanizeDB
// Copyright © 2019 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 cmd
import (
"time"
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log "github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/vulcanize/vulcanizedb/pkg/core"
"github.com/vulcanize/vulcanizedb/pkg/datastore"
"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
"github.com/vulcanize/vulcanizedb/pkg/geth"
"github.com/vulcanize/vulcanizedb/pkg/history"
"github.com/vulcanize/vulcanizedb/utils"
)
// lightSyncCmd represents the lightSync command
var lightSyncCmd = &cobra.Command{
Use: "lightSync",
Short: "Syncs VulcanizeDB with local ethereum node's block headers",
Long: `Syncs VulcanizeDB with local ethereum node. Populates
Postgres with block headers.
./vulcanizedb lightSync --starting-block-number 0 --config public.toml
Expects ethereum node to be running and requires a .toml config:
[database]
name = "vulcanize_public"
hostname = "localhost"
port = 5432
[client]
ipcPath = "/Users/user/Library/Ethereum/geth.ipc"
`,
Run: func(cmd *cobra.Command, args []string) {
lightSync()
},
}
func init() {
rootCmd.AddCommand(lightSyncCmd)
lightSyncCmd.Flags().Int64VarP(&startingBlockNumber, "starting-block-number", "s", 0, "Block number to start syncing from")
}
func backFillAllHeaders(blockchain core.BlockChain, headerRepository datastore.HeaderRepository, missingBlocksPopulated chan int, startingBlockNumber int64) {
populated, err := history.PopulateMissingHeaders(blockchain, headerRepository, startingBlockNumber)
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if err != nil {
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// TODO Lots of possible errors in the call stack above. If errors occur, we still put
// 0 in the channel, triggering another round
log.Error("backfillAllHeaders: Error populating headers: ", err)
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}
missingBlocksPopulated <- populated
}
func lightSync() {
ticker := time.NewTicker(pollingInterval)
defer ticker.Stop()
blockChain := getBlockChain()
validateArgs(blockChain)
db := utils.LoadPostgres(databaseConfig, blockChain.Node())
headerRepository := repositories.NewHeaderRepository(&db)
validator := history.NewHeaderValidator(blockChain, headerRepository, validationWindow)
missingBlocksPopulated := make(chan int)
go backFillAllHeaders(blockChain, headerRepository, missingBlocksPopulated, startingBlockNumber)
for {
select {
case <-ticker.C:
window, err := validator.ValidateHeaders()
if err != nil {
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log.Error("lightSync: ValidateHeaders failed: ", err)
}
log.Info(window.GetString())
case n := <-missingBlocksPopulated:
if n == 0 {
time.Sleep(3 * time.Second)
}
go backFillAllHeaders(blockChain, headerRepository, missingBlocksPopulated, startingBlockNumber)
}
}
}
func validateArgs(blockChain *geth.BlockChain) {
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lastBlock, err := blockChain.LastBlock()
if err != nil {
log.Error("validateArgs: Error getting last block: ", err)
}
if lastBlock.Int64() == 0 {
log.Fatal("geth initial: state sync not finished")
}
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if startingBlockNumber > lastBlock.Int64() {
log.Fatal("starting block number > current block number")
}
}