ipld-eth-server/cmd/lightSync.go

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// Copyright © 2018 Vulcanize
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"log"
"os"
"time"
"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 {
log.Fatal("Error populating headers: ", err)
}
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 := validator.ValidateHeaders()
window.Log(os.Stdout)
case <-missingBlocksPopulated:
go backFillAllHeaders(blockChain, headerRepository, missingBlocksPopulated, startingBlockNumber)
}
}
}
func validateArgs(blockChain *geth.BlockChain) {
lastBlock := blockChain.LastBlock().Int64()
if lastBlock == 0 {
log.Fatal("geth initial: state sync not finished")
}
if startingBlockNumber > lastBlock {
log.Fatal("starting block number > current block number")
}
}