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Blockchain: Change of block format.

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File records:
* Add unique ID to file record.
* Introducing tags which are flexible. Close #31
* Name and Directory fields are now tags.
* Embedded basic compression by storing duplicate file tags as single record.
Added date field to record structure.
This commit is contained in:
Kleissner
2021-08-27 03:12:30 +02:00
parent ea80588fa1
commit a2384ca627
7 changed files with 387 additions and 177 deletions
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46
Block Encoding.go
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@@ -3,7 +3,22 @@ File Name: Block Encoding.go
Copyright: 2021 Peernet s.r.o.
Author: Peter Kleissner
Block encoding in messages and local storage.
Encoding of a block (it is the same stored in the database and shared in a message):
Offset Size Info
0 65 Signature of entire block
65 32 Hash (blake3) of last block. 0 for first one.
97 8 Blockchain version number
105 4 Block number
109 4 Size of entire block including this header
113 2 Count of records that follow
Each record inside the block has this basic structure:
Offset Size Info
0 1 Record type
1 8 Date created. This remains the same in case of block refactoring.
9 4 Size of data
13 ? Data (encoding depends on record type)
*/
package core
@@ -12,6 +27,7 @@ import (
"bytes"
"encoding/binary"
"errors"
"time"
"github.com/btcsuite/btcd/btcec"
)
@@ -28,12 +44,13 @@ type Block struct {
// BlockRecordRaw is a single block record (not decoded)
type BlockRecordRaw struct {
Type uint8 // Record Type. See RecordTypeX.
Data []byte // Data according to the type
Type uint8 // Record Type. See RecordTypeX.
Date time.Time // Date created. This remains the same in case of block refactoring.
Data []byte // Data according to the type
}
const blockHeaderSize = 115
const blockRecordHeaderSize = 5
const blockRecordHeaderSize = 13
// decodeBlock decodes a single block
func decodeBlock(raw []byte) (block *Block, err error) {
@@ -67,18 +84,19 @@ func decodeBlock(raw []byte) (block *Block, err error) {
for n := uint16(0); n < countRecords; n++ {
if index+blockRecordHeaderSize > len(raw) {
return nil, errors.New("decodeBlock block record exceeds block size")
return nil, errors.New("decodeBlock record exceeds block size")
}
recordType := raw[index]
recordSize := binary.LittleEndian.Uint32(raw[index+1 : index+5])
recordDate := int64(binary.LittleEndian.Uint64(raw[index+1 : index+9])) // Unix time int64, the number of seconds elapsed since January 1, 1970 UTC
recordSize := binary.LittleEndian.Uint32(raw[index+9 : index+9+4])
index += blockRecordHeaderSize
if index+int(recordSize) > len(raw) {
return nil, errors.New("decodeBlock block record exceeds block size")
return nil, errors.New("decodeBlock record exceeds block size")
}
block.RecordsRaw = append(block.RecordsRaw, BlockRecordRaw{Type: recordType, Data: raw[index : index+int(recordSize)]})
block.RecordsRaw = append(block.RecordsRaw, BlockRecordRaw{Type: recordType, Data: raw[index : index+int(recordSize)], Date: time.Unix(recordDate, 0)})
index += int(recordSize)
}
@@ -111,11 +129,17 @@ func encodeBlock(block *Block, ownerPrivateKey *btcec.PrivateKey) (raw []byte, e
countRecords := uint16(0)
for _, record := range block.RecordsRaw {
var temp [8]byte
binary.LittleEndian.PutUint32(temp[0:4], uint32(len(record.Data)))
if record.Date == (time.Time{}) { // Always set date if not already set
record.Date = time.Now()
}
var tempSize, tempDate [8]byte
binary.LittleEndian.PutUint32(tempSize[0:4], uint32(len(record.Data)))
binary.LittleEndian.PutUint64(tempDate[0:8], uint64(record.Date.UTC().Unix()))
buffer.Write([]byte{record.Type}) // Record Type
buffer.Write(temp[:4]) // Size of data
buffer.Write(tempDate[:8]) // Date created
buffer.Write(tempSize[:4]) // Size of data
buffer.Write(record.Data) // Data
countRecords++