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directoryBlock.go
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directoryBlock.go
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// Copyright 2017 Factom Foundation
// Use of this source code is governed by the MIT
// license that can be found in the LICENSE file.
package directoryBlock
import (
"bytes"
"encoding/json"
"fmt"
"os"
"errors"
"github.com/FactomProject/factomd/common/constants"
"github.com/FactomProject/factomd/common/interfaces"
"github.com/FactomProject/factomd/common/primitives"
)
var _ = fmt.Print
type DirectoryBlock struct {
//Not Marshalized
DBHash interfaces.IHash `json:"dbhash"`
KeyMR interfaces.IHash `json:"keymr"`
HeaderHash interfaces.IHash `json:"headerhash"`
keyMRset bool `json:"keymrset"`
//Marshalized
Header interfaces.IDirectoryBlockHeader `json:"header"`
DBEntries []interfaces.IDBEntry `json:"dbentries"`
}
var _ interfaces.Printable = (*DirectoryBlock)(nil)
var _ interfaces.BinaryMarshallableAndCopyable = (*DirectoryBlock)(nil)
var _ interfaces.IDirectoryBlock = (*DirectoryBlock)(nil)
var _ interfaces.DatabaseBatchable = (*DirectoryBlock)(nil)
var _ interfaces.DatabaseBlockWithEntries = (*DirectoryBlock)(nil)
func (c *DirectoryBlock) Init() {
if c.Header == nil {
h := new(DBlockHeader)
h.Init()
c.Header = h
}
}
func (a *DirectoryBlock) IsSameAs(b interfaces.IDirectoryBlock) bool {
if a == nil || b == nil {
if a == nil && b == nil {
return true
}
return false
}
if a.Header.IsSameAs(b.GetHeader()) == false {
return false
}
bDBEntries := b.GetDBEntries()
if len(a.DBEntries) != len(bDBEntries) {
return false
}
for i := range a.DBEntries {
if a.DBEntries[i].IsSameAs(bDBEntries[i]) == false {
return false
}
}
return true
}
func (c *DirectoryBlock) SetEntryHash(hash, chainID interfaces.IHash, index int) {
if len(c.DBEntries) <= index {
ent := make([]interfaces.IDBEntry, index+1)
copy(ent, c.DBEntries)
c.DBEntries = ent
}
dbe := new(DBEntry)
dbe.ChainID = chainID
dbe.KeyMR = hash
c.DBEntries[index] = dbe
}
func (c *DirectoryBlock) SetABlockHash(aBlock interfaces.IAdminBlock) error {
hash := aBlock.DatabasePrimaryIndex()
c.SetEntryHash(hash, aBlock.GetChainID(), 0)
return nil
}
func (c *DirectoryBlock) SetECBlockHash(ecBlock interfaces.IEntryCreditBlock) error {
hash := ecBlock.DatabasePrimaryIndex()
c.SetEntryHash(hash, ecBlock.GetChainID(), 1)
return nil
}
func (c *DirectoryBlock) SetFBlockHash(fBlock interfaces.IFBlock) error {
hash := fBlock.DatabasePrimaryIndex()
c.SetEntryHash(hash, fBlock.GetChainID(), 2)
return nil
}
func (c *DirectoryBlock) GetEntryHashes() []interfaces.IHash {
entries := c.DBEntries[:]
answer := make([]interfaces.IHash, len(entries))
for i, entry := range entries {
answer[i] = entry.GetKeyMR()
}
return answer
}
func (c *DirectoryBlock) GetEntrySigHashes() []interfaces.IHash {
return nil
}
//bubble sort
func (c *DirectoryBlock) Sort() {
done := false
for i := 3; !done && i < len(c.DBEntries)-1; i++ {
done = true
for j := 3; j < len(c.DBEntries)-1-i+3; j++ {
comp := bytes.Compare(c.DBEntries[j].GetChainID().Bytes(),
c.DBEntries[j+1].GetChainID().Bytes())
if comp > 0 {
h := c.DBEntries[j]
c.DBEntries[j] = c.DBEntries[j+1]
c.DBEntries[j+1] = h
done = false
}
}
}
}
func (c *DirectoryBlock) GetEntryHashesForBranch() []interfaces.IHash {
entries := c.DBEntries[:]
answer := make([]interfaces.IHash, 2*len(entries))
for i, entry := range entries {
answer[2*i] = entry.GetChainID()
answer[2*i+1] = entry.GetKeyMR()
}
return answer
}
func (c *DirectoryBlock) GetDBEntries() []interfaces.IDBEntry {
return c.DBEntries
}
func (c *DirectoryBlock) GetEBlockDBEntries() []interfaces.IDBEntry {
answer := []interfaces.IDBEntry{}
for _, v := range c.DBEntries {
if v.GetChainID().String() == "000000000000000000000000000000000000000000000000000000000000000a" {
continue
}
if v.GetChainID().String() == "000000000000000000000000000000000000000000000000000000000000000f" {
continue
}
if v.GetChainID().String() == "000000000000000000000000000000000000000000000000000000000000000c" {
continue
}
answer = append(answer, v)
}
return answer
}
func (c *DirectoryBlock) CheckDBEntries() error {
if len(c.DBEntries) < 3 {
return fmt.Errorf("Not enough entries - %v", len(c.DBEntries))
}
if c.DBEntries[0].GetChainID().String() != "000000000000000000000000000000000000000000000000000000000000000a" {
return fmt.Errorf("Invalid ChainID at position 0 - %v", c.DBEntries[0].GetChainID().String())
}
if c.DBEntries[1].GetChainID().String() != "000000000000000000000000000000000000000000000000000000000000000c" {
return fmt.Errorf("Invalid ChainID at position 1 - %v", c.DBEntries[1].GetChainID().String())
}
if c.DBEntries[2].GetChainID().String() != "000000000000000000000000000000000000000000000000000000000000000f" {
return fmt.Errorf("Invalid ChainID at position 2 - %v", c.DBEntries[2].GetChainID().String())
}
return nil
}
func (c *DirectoryBlock) GetKeyMR() (rval interfaces.IHash) {
defer func() { rval = primitives.CheckNil(rval, "DirectoryBlock.GetKeyMR") }()
keyMR, err := c.BuildKeyMerkleRoot()
if err != nil {
panic("Failed to build the key MR")
}
//if c.keyMRset && c.KeyMR.Fixed() != keyMR.Fixed() {
// panic("keyMR changed!")
//}
c.KeyMR = keyMR
c.keyMRset = true
return c.KeyMR
}
func (c *DirectoryBlock) GetHeader() interfaces.IDirectoryBlockHeader {
c.Init()
return c.Header
}
func (c *DirectoryBlock) SetHeader(header interfaces.IDirectoryBlockHeader) {
c.Header = header
}
func (c *DirectoryBlock) SetDBEntries(dbEntries []interfaces.IDBEntry) error {
if dbEntries == nil {
return errors.New("dbEntries cannot be nil")
}
c.DBEntries = dbEntries
return nil
}
func (c *DirectoryBlock) New() interfaces.BinaryMarshallableAndCopyable {
dBlock := new(DirectoryBlock)
dBlock.Header = NewDBlockHeader()
dBlock.DBHash = primitives.NewZeroHash()
dBlock.KeyMR = primitives.NewZeroHash()
return dBlock
}
func (c *DirectoryBlock) GetDatabaseHeight() uint32 {
c.Init()
return c.GetHeader().GetDBHeight()
}
func (c *DirectoryBlock) GetChainID() (rval interfaces.IHash) {
defer func() { rval = primitives.CheckNil(rval, "DirectoryBlock.GetChainID") }()
return primitives.NewHash(constants.D_CHAINID)
}
func (c *DirectoryBlock) DatabasePrimaryIndex() (rval interfaces.IHash) {
defer func() { rval = primitives.CheckNil(rval, "DirectoryBlock.DatabasePrimaryIndex") }()
return c.GetKeyMR()
}
func (c *DirectoryBlock) DatabaseSecondaryIndex() (rval interfaces.IHash) {
defer func() { rval = primitives.CheckNil(rval, "DirectoryBlock.DatabaseSecondaryIndex") }()
return c.GetHash()
}
func (e *DirectoryBlock) JSONByte() ([]byte, error) {
return primitives.EncodeJSON(e)
}
func (e *DirectoryBlock) JSONString() (string, error) {
return primitives.EncodeJSONString(e)
}
func (e *DirectoryBlock) String() string {
e.Init()
var out primitives.Buffer
kmr := e.GetKeyMR()
out.WriteString(fmt.Sprintf("%20s %v\n", "keymr:", kmr.String()))
kmr = e.BodyKeyMR()
out.WriteString(fmt.Sprintf("%20s %v\n", "bodymr:", kmr.String()))
fh := e.GetFullHash()
out.WriteString(fmt.Sprintf("%20s %v\n", "fullhash:", fh.String()))
out.WriteString(e.GetHeader().String())
out.WriteString("entries:\n")
for i, entry := range e.DBEntries {
out.WriteString(fmt.Sprintf("%5d %s", i, entry.String()))
}
return (string)(out.DeepCopyBytes())
}
func (b *DirectoryBlock) MarshalBinary() (rval []byte, err error) {
defer func(pe *error) {
if *pe != nil {
fmt.Fprintf(os.Stderr, "DirectoryBlock.MarshalBinary err:%v", *pe)
}
}(&err)
b.Init()
b.Sort()
_, err = b.BuildBodyMR()
if err != nil {
return nil, err
}
buf := primitives.NewBuffer(nil)
err = buf.PushBinaryMarshallable(b.GetHeader())
if err != nil {
return nil, err
}
for i := uint32(0); i < b.Header.GetBlockCount(); i++ {
err = buf.PushBinaryMarshallable(b.GetDBEntries()[i])
if err != nil {
return nil, err
}
}
return buf.DeepCopyBytes(), err
}
func (b *DirectoryBlock) BuildBodyMR() (interfaces.IHash, error) {
count := uint32(len(b.GetDBEntries()))
b.GetHeader().SetBlockCount(count)
if count == 0 {
panic("Zero block size!")
}
hashes := make([]interfaces.IHash, len(b.GetDBEntries()))
for i, entry := range b.GetDBEntries() {
data, err := entry.MarshalBinary()
if err != nil {
return nil, err
}
hashes[i] = primitives.Sha(data)
}
if len(hashes) == 0 {
hashes = append(hashes, primitives.Sha(nil))
}
merkleTree := primitives.BuildMerkleTreeStore(hashes)
merkleRoot := merkleTree[len(merkleTree)-1]
b.GetHeader().SetBodyMR(merkleRoot)
return merkleRoot, nil
}
func (b *DirectoryBlock) GetHeaderHash() (interfaces.IHash, error) {
b.Header.SetBlockCount(uint32(len(b.GetDBEntries())))
return b.Header.GetHeaderHash()
}
func (b *DirectoryBlock) BodyKeyMR() (rval interfaces.IHash) {
defer func() { rval = primitives.CheckNil(rval, "DirectoryBlock.BodyKeyMR") }()
key, _ := b.BuildBodyMR()
return key
}
func (b *DirectoryBlock) BuildKeyMerkleRoot() (keyMR interfaces.IHash, err error) {
// Create the Entry Block Key Merkle Root from the hash of Header and the Body Merkle Root
hashes := make([]interfaces.IHash, 0, 2)
bodyKeyMR := b.BodyKeyMR() //This needs to be called first to build the header properly!!
headerHash, err := b.GetHeaderHash()
if err != nil {
return nil, err
}
b.HeaderHash = headerHash
hashes = append(hashes, headerHash)
hashes = append(hashes, bodyKeyMR)
merkle := primitives.BuildMerkleTreeStore(hashes)
keyMR = merkle[len(merkle)-1] // MerkleRoot is not marshalized in Dir Block
b.KeyMR = keyMR
b.GetFullHash() // Create the Full Hash when we create the keyMR
return primitives.NewHash(keyMR.Bytes()), nil
}
func UnmarshalDBlock(data []byte) (interfaces.IDirectoryBlock, error) {
dBlock := new(DirectoryBlock)
dBlock.Header = NewDBlockHeader()
dBlock.DBHash = primitives.NewZeroHash()
dBlock.KeyMR = primitives.NewZeroHash()
err := dBlock.UnmarshalBinary(data)
if err != nil {
return nil, err
}
return dBlock, nil
}
func (b *DirectoryBlock) UnmarshalBinaryData(data []byte) ([]byte, error) {
newData := data
var err error
var fbh interfaces.IDirectoryBlockHeader = new(DBlockHeader)
newData, err = fbh.UnmarshalBinaryData(data)
if err != nil {
return nil, err
}
b.SetHeader(fbh)
// entryLimit is the maximum number of 32 byte entries that could fit in the body of the binary dblock
entryLimit := uint32(len(newData) / 32)
entryCount := b.GetHeader().GetBlockCount()
if entryCount > entryLimit {
return nil, fmt.Errorf(
"Error: DirectoryBlock.UnmarshalBinary: Entry count %d is larger "+
"than body size %d. (uint underflow?)",
entryCount, entryLimit,
)
}
entries := make([]interfaces.IDBEntry, entryCount)
for i := uint32(0); i < entryCount; i++ {
entries[i] = new(DBEntry)
newData, err = entries[i].UnmarshalBinaryData(newData)
if err != nil {
return nil, err
}
}
err = b.SetDBEntries(entries)
if err != nil {
return nil, err
}
err = b.CheckDBEntries()
if err != nil {
return nil, err
}
return newData, nil
}
func (h *DirectoryBlock) GetTimestamp() interfaces.Timestamp {
return h.GetHeader().GetTimestamp().Clone()
}
func (b *DirectoryBlock) UnmarshalBinary(data []byte) (err error) {
_, err = b.UnmarshalBinaryData(data)
return
}
func (b *DirectoryBlock) GetHash() (rval interfaces.IHash) {
defer func() { rval = primitives.CheckNil(rval, "DirectoryBlock.GetHash") }()
return b.GetFullHash()
}
func (b *DirectoryBlock) GetFullHash() (rval interfaces.IHash) {
defer func() { rval = primitives.CheckNil(rval, "DirectoryBlock.GetFullHash") }()
binaryDblock, err := b.MarshalBinary()
if err != nil {
return nil
}
b.DBHash = primitives.Sha(binaryDblock)
return b.DBHash
}
func (b *DirectoryBlock) AddEntry(chainID interfaces.IHash, keyMR interfaces.IHash) error {
var dbentry interfaces.IDBEntry
dbentry = new(DBEntry)
dbentry.SetChainID(chainID)
dbentry.SetKeyMR(keyMR)
if b.DBEntries == nil {
b.DBEntries = []interfaces.IDBEntry{}
}
return b.SetDBEntries(append(b.DBEntries, dbentry))
}
/*********************************************************************
* Support
*********************************************************************/
func NewDirectoryBlock(prev interfaces.IDirectoryBlock) interfaces.IDirectoryBlock {
newdb := new(DirectoryBlock)
newdb.Header = new(DBlockHeader)
newdb.GetHeader().SetVersion(constants.VERSION_0)
if prev != nil {
newdb.GetHeader().SetPrevFullHash(prev.GetFullHash())
newdb.GetHeader().SetPrevKeyMR(prev.GetKeyMR())
newdb.GetHeader().SetDBHeight(prev.GetHeader().GetDBHeight() + 1)
} else {
newdb.GetHeader().SetPrevFullHash(primitives.NewZeroHash())
newdb.GetHeader().SetPrevKeyMR(primitives.NewZeroHash())
newdb.GetHeader().SetDBHeight(0)
}
newdb.SetDBEntries(make([]interfaces.IDBEntry, 0))
newdb.AddEntry(primitives.NewHash(constants.ADMIN_CHAINID), primitives.NewZeroHash())
newdb.AddEntry(primitives.NewHash(constants.EC_CHAINID), primitives.NewZeroHash())
newdb.AddEntry(primitives.NewHash(constants.FACTOID_CHAINID), primitives.NewZeroHash())
return newdb
}
func CheckBlockPairIntegrity(block interfaces.IDirectoryBlock, prev interfaces.IDirectoryBlock) error {
if block == nil {
return fmt.Errorf("No block specified")
}
if prev == nil {
if block.GetHeader().GetPrevKeyMR().IsZero() == false {
return fmt.Errorf("Invalid PrevKeyMR")
}
if block.GetHeader().GetPrevFullHash().IsZero() == false {
return fmt.Errorf("Invalid PrevFullHash")
}
if block.GetHeader().GetDBHeight() != 0 {
return fmt.Errorf("Invalid DBHeight")
}
} else {
if block.GetHeader().GetPrevKeyMR().IsSameAs(prev.GetKeyMR()) == false {
return fmt.Errorf("Invalid PrevKeyMR")
}
if block.GetHeader().GetPrevFullHash().IsSameAs(prev.GetFullHash()) == false {
return fmt.Errorf("Invalid PrevFullHash")
}
if block.GetHeader().GetDBHeight() != (prev.GetHeader().GetDBHeight() + 1) {
return fmt.Errorf("Invalid DBHeight")
}
}
return nil
}
type ExpandedDBlock DirectoryBlock
func (e DirectoryBlock) MarshalJSON() ([]byte, error) {
e.GetKeyMR()
e.GetFullHash()
return json.Marshal(ExpandedDBlock(e))
}