// 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() {
cfg := config{
DbType: "leveldb",
DataDir: defaultDataDir,
}
parser := flags.NewParser(&cfg, flags.Default)
_, err := parser.Parse()
if err != nil {
if e, ok := err.(*flags.Error); !ok || e.Type != flags.ErrHelp {
parser.WriteHelp(os.Stderr)
}
return
}
backendLogger := btclog.NewDefaultBackendLogger()
defer backendLogger.Flush()
log = btclog.NewSubsystemLogger(backendLogger, "")
database.UseLogger(log)
// Multiple networks can't be selected simultaneously.
funcName := "main"
numNets := 0
// Count number of network flags passed; assign active network params
// while we're at it
if cfg.TestNet3 {
numNets++
activeNetParams = &chaincfg.TestNet3Params
}
if cfg.RegressionTest {
numNets++
activeNetParams = &chaincfg.RegressionNetParams
}
if cfg.SimNet {
numNets++
activeNetParams = &chaincfg.SimNetParams
}
if numNets > 1 {
str := "%s: The testnet, regtest, and simnet params can't be " +
"used together -- choose one of the three"
err := fmt.Errorf(str, funcName)
fmt.Fprintln(os.Stderr, err)
parser.WriteHelp(os.Stderr)
return
}
cfg.DataDir = filepath.Join(cfg.DataDir, netName(activeNetParams))
blockDbNamePrefix := "blocks"
dbName := blockDbNamePrefix + "_" + cfg.DbType
if cfg.DbType == "sqlite" {
dbName = dbName + ".db"
}
dbPath := filepath.Join(cfg.DataDir, dbName)
log.Infof("loading db")
db, err := database.OpenDB(cfg.DbType, dbPath)
if err != nil {
log.Warnf("db open failed: %v", err)
return
}
defer db.Close()
log.Infof("db load complete")
_, height, err := db.NewestSha()
log.Infof("loaded block height %v", height)
sha, err := getSha(db, cfg.ShaString)
if err != nil {
log.Infof("Invalid block hash %v", cfg.ShaString)
return
}
err = db.DropAfterBlockBySha(&sha)
if err != nil {
log.Warnf("failed %v", err)
}
}