func ImportChain(chainmgr *core.ChainManager, fn string) error {
fmt.Printf("importing blockchain '%s'\n", fn)
fh, err := os.OpenFile(fn, os.O_RDONLY, os.ModePerm)
if err != nil {
return err
}
defer fh.Close()
chainmgr.Reset()
stream := rlp.NewStream(fh, 0)
var i, n int
batchSize := 2500
blocks := make(types.Blocks, batchSize)
for ; ; i++ {
var b types.Block
if err := stream.Decode(&b); err == io.EOF {
break
} else if err != nil {
return fmt.Errorf("at block %d: %v", i, err)
}
blocks[n] = &b
n++
if n == batchSize {
if _, err := chainmgr.InsertChain(blocks); err != nil {
return fmt.Errorf("invalid block %v", err)
}
n = 0
blocks = make(types.Blocks, batchSize)
}
}
if n > 0 {
if _, err := chainmgr.InsertChain(blocks[:n]); err != nil {
return fmt.Errorf("invalid block %v", err)
}
}
fmt.Printf("imported %d blocks\n", i)
return nil
}