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addblock.go
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addblock.go
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// Copyright (c) 2013-2014 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package main
import (
"os"
"path/filepath"
"runtime"
"github.com/btcsuite/btcd/blockchain"
"github.com/btcsuite/btcd/database"
_ "github.com/btcsuite/btcd/database/ldb"
"github.com/btcsuite/btcd/limits"
"github.com/btcsuite/btclog"
)
const (
// blockDbNamePrefix is the prefix for the btcd block database.
blockDbNamePrefix = "blocks"
)
var (
cfg *config
log btclog.Logger
)
// loadBlockDB opens the block database and returns a handle to it.
func loadBlockDB() (database.Db, error) {
// The database name is based on the database type.
dbName := blockDbNamePrefix + "_" + cfg.DbType
if cfg.DbType == "sqlite" {
dbName = dbName + ".db"
}
dbPath := filepath.Join(cfg.DataDir, dbName)
log.Infof("Loading block database from '%s'", dbPath)
db, err := database.OpenDB(cfg.DbType, dbPath)
if err != nil {
// Return the error if it's not because the database doesn't
// exist.
if err != database.ErrDbDoesNotExist {
return nil, err
}
// Create the db if it does not exist.
err = os.MkdirAll(cfg.DataDir, 0700)
if err != nil {
return nil, err
}
db, err = database.CreateDB(cfg.DbType, dbPath)
if err != nil {
return nil, err
}
}
// Get the latest block height from the database.
_, height, err := db.NewestSha()
if err != nil {
db.Close()
return nil, err
}
log.Infof("Block database loaded with block height %d", height)
return db, nil
}
// realMain is the real main function for the utility. It is necessary to work
// around the fact that deferred functions do not run when os.Exit() is called.
func realMain() error {
// Load configuration and parse command line.
tcfg, _, err := loadConfig()
if err != nil {
return err
}
cfg = tcfg
// Setup logging.
backendLogger := btclog.NewDefaultBackendLogger()
defer backendLogger.Flush()
log = btclog.NewSubsystemLogger(backendLogger, "")
database.UseLogger(btclog.NewSubsystemLogger(backendLogger, "BCDB: "))
blockchain.UseLogger(btclog.NewSubsystemLogger(backendLogger, "CHAN: "))
// Load the block database.
db, err := loadBlockDB()
if err != nil {
log.Errorf("Failed to load database: %v", err)
return err
}
defer db.Close()
fi, err := os.Open(cfg.InFile)
if err != nil {
log.Errorf("Failed to open file %v: %v", cfg.InFile, err)
return err
}
defer fi.Close()
// Create a block importer for the database and input file and start it.
// The done channel returned from start will contain an error if
// anything went wrong.
importer := newBlockImporter(db, fi)
// Perform the import asynchronously. This allows blocks to be
// processed and read in parallel. The results channel returned from
// Import contains the statistics about the import including an error
// if something went wrong.
log.Info("Starting import")
resultsChan := importer.Import()
results := <-resultsChan
if results.err != nil {
log.Errorf("%v", results.err)
return results.err
}
log.Infof("Processed a total of %d blocks (%d imported, %d already "+
"known)", results.blocksProcessed, results.blocksImported,
results.blocksProcessed-results.blocksImported)
return nil
}
func main() {
// Use all processor cores and up some limits.
runtime.GOMAXPROCS(runtime.NumCPU())
if err := limits.SetLimits(); err != nil {
os.Exit(1)
}
// Work around defer not working after os.Exit()
if err := realMain(); err != nil {
os.Exit(1)
}
}