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blockslog.go
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blockslog.go
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package blockslog
import (
"encoding/binary"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"os"
"github.com/apepenkov/eos-go-fixed-p2p"
)
func Process(filename string) error {
fl, err := os.Open(filename)
if err != nil {
return err
}
versionData := make([]byte, 4)
_, err = fl.Read(versionData)
if err != nil {
return err
}
version := versionData[0]
fmt.Println("Version", version)
firstBlockData := []byte{1, 0, 0, 0}
if version > 1 {
fmt.Println("Reading first block")
_, err = fl.Read(firstBlockData)
if err != nil {
return err
}
}
firstBlockNum := binary.LittleEndian.Uint32(firstBlockData)
fmt.Println("First block", firstBlockNum)
// Certain conditions where the genesis state is written:
// bool block_log::contains_genesis_state(uint32_t version, uint32_t first_block_num) {
// return version <= 2 || first_block_num == 1;
// }
chainID := make([]byte, 32)
if version >= 3 && firstBlockNum > 1 {
fmt.Println("Reading Chain ID")
_, err = fl.Read(chainID)
if err != nil {
return err
}
}
fmt.Println("Chain ID", hex.EncodeToString(chainID))
if version != 1 {
totem := make([]byte, 8)
_, err := fl.Read(totem)
if err != nil {
return err
}
fmt.Println("Totem", totem)
}
for i := 0 ; i < 5; i++{
cnt := make([]byte, 1000000)
prevPos, err := fl.Seek(0, os.SEEK_CUR)
if err != nil {
return err
}
_, err = fl.Read(cnt)
if err == io.EOF {
break
}
if err != nil {
return err
}
d := eos.NewDecoder(cnt)
var block *eos.SignedBlock
if err := d.Decode(&block); err != nil {
return fmt.Errorf("decoding signed block: %w", err)
}
jsonStr, err := json.Marshal(block)
if err != nil {
return err
}
fmt.Println(string(jsonStr))
if _, err = fl.Seek(prevPos+int64(d.LastPos())+8, os.SEEK_SET); err != nil {
return err
}
fmt.Println("Last pos", d.LastPos())
}
return nil
}