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eblock.go
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eblock.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 entryBlock
import (
"fmt"
"os"
"reflect"
"github.com/DCNT-Hammer/dcnt/common/interfaces"
"github.com/DCNT-Hammer/dcnt/common/primitives"
)
// EBlock is the Entry Block. It holds the hashes of the Entries and its Merkle
// Root is written into the Directory Blocks. Each Entry Block represents all
// of the entries for a particular Chain during a 10 minute period.
type EBlock struct {
Header interfaces.IEntryBlockHeader `json:"header"`
Body *EBlockBody `json:"body"`
}
var _ interfaces.Printable = (*EBlock)(nil)
var _ interfaces.BinaryMarshallableAndCopyable = (*EBlock)(nil)
var _ interfaces.BinaryMarshallable = (*EBlock)(nil)
var _ interfaces.DatabaseBatchable = (*EBlock)(nil)
var _ interfaces.IEntryBlock = (*EBlock)(nil)
var _ interfaces.DatabaseBlockWithEntries = (*EBlock)(nil)
func (c *EBlock) Init() {
if c.Header == nil {
h := new(EBlockHeader)
h.Init()
c.Header = h
}
if c.Body == nil {
c.Body = new(EBlockBody)
}
}
func (a *EBlock) IsSameAs(b interfaces.IEntryBlock) bool {
if a == nil || b == nil {
if a == nil && b == nil {
return true
}
return false
}
if a.Header.IsSameAs(b.GetHeader()) == false {
return false
}
if a.Body.IsSameAs(b.GetBody()) == false {
return false
}
return true
}
func (c *EBlock) GetEntryHashes() []interfaces.IHash {
return c.GetBody().GetEBEntries()
}
func (c *EBlock) GetEntrySigHashes() []interfaces.IHash {
return nil
}
func (c *EBlock) New() interfaces.BinaryMarshallableAndCopyable {
return NewEBlock()
}
func (c *EBlock) GetDatabaseHeight() uint32 {
return c.GetHeader().GetDBHeight()
}
func (c *EBlock) GetChainID() (rval interfaces.IHash) {
defer func() {
if rval != nil && reflect.ValueOf(rval).IsNil() {
rval = nil // convert an interface that is nil to a nil interface
primitives.LogNilHashBug("EBlock.GetChainID() saw an interface that was nil")
}
}()
return c.GetHeader().GetChainID()
}
func (c *EBlock) GetHashOfChainID() []byte {
return primitives.DoubleSha(c.GetChainID().Bytes())
}
func (c *EBlock) GetHashOfChainIDHash() (rval interfaces.IHash) {
defer func() {
if rval != nil && reflect.ValueOf(rval).IsNil() {
rval = nil // convert an interface that is nil to a nil interface
primitives.LogNilHashBug("EBlock.GetHashOfChainIDHash() saw an interface that was nil")
}
}()
hash := primitives.NewZeroHash()
hash.SetBytes(c.GetHashOfChainID())
return hash
}
func (c *EBlock) DatabasePrimaryIndex() (rval interfaces.IHash) {
defer func() {
if rval != nil && reflect.ValueOf(rval).IsNil() {
rval = nil // convert an interface that is nil to a nil interface
primitives.LogNilHashBug("EBlock.DatabasePrimaryIndex() saw an interface that was nil")
}
}()
key, _ := c.KeyMR()
return key
}
func (c *EBlock) DatabaseSecondaryIndex() (rval interfaces.IHash) {
defer func() {
if rval != nil && reflect.ValueOf(rval).IsNil() {
rval = nil // convert an interface that is nil to a nil interface
primitives.LogNilHashBug("EBlock.DatabaseSecondaryIndex() saw an interface that was nil")
}
}()
h, _ := c.Hash()
return h
}
func (c *EBlock) GetHeader() interfaces.IEntryBlockHeader {
c.Init()
return c.Header
}
func (c *EBlock) GetBody() interfaces.IEBlockBody {
c.Init()
return c.Body
}
// AddEBEntry creates a new Entry Block Entry from the provided Factom Entry
// and adds it to the Entry Block Body.
func (e *EBlock) AddEBEntry(entry interfaces.IEBEntry) error {
e.Init()
e.GetBody().AddEBEntry(entry.GetHash())
if err := e.BuildHeader(); err != nil {
return err
}
return nil
}
// AddEndOfMinuteMarker adds the End of Minute to the Entry Block. The End of
// Minut byte becomes the last byte in a 32 byte slice that is added to the
// Entry Block Body as an Entry Block Entry.
func (e *EBlock) AddEndOfMinuteMarker(m byte) error {
e.Init()
e.GetBody().AddEndOfMinuteMarker(m)
if err := e.BuildHeader(); err != nil {
return err
}
return nil
}
// BuildHeader updates the Entry Block Header to include information about the
// Entry Block Body. BuildHeader should be run after the Entry Block Body has
// included all of its EntryEntries.
func (e *EBlock) BuildHeader() error {
e.GetHeader().SetBodyMR(e.GetBody().MR())
e.GetHeader().SetEntryCount(uint32(len(e.GetEntryHashes())))
return nil
}
func (e *EBlock) GetHash() (rval interfaces.IHash) {
defer func() {
if rval != nil && reflect.ValueOf(rval).IsNil() {
rval = nil // convert an interface that is nil to a nil interface
primitives.LogNilHashBug("EBlock.GetHash() saw an interface that was nil")
}
}()
h, _ := e.Hash()
return h
}
// Hash returns the simple Sha256 hash of the serialized Entry Block. Hash is
// used to provide the PrevFullHash to the next Entry Block in a Chain.
func (e *EBlock) Hash() (interfaces.IHash, error) {
p, err := e.MarshalBinary()
if err != nil {
return nil, err
}
return primitives.Sha(p), nil
}
func (e *EBlock) HeaderHash() (interfaces.IHash, error) {
e.BuildHeader()
header, err := e.GetHeader().MarshalBinary()
if err != nil {
return nil, err
}
h := primitives.Sha(header)
return h, nil
}
func (e *EBlock) BodyKeyMR() (rval interfaces.IHash) {
defer func() {
if rval != nil && reflect.ValueOf(rval).IsNil() {
rval = nil // convert an interface that is nil to a nil interface
primitives.LogNilHashBug("EBlock.BodyKeyMR() saw an interface that was nil")
}
}()
e.BuildHeader()
return e.GetHeader().GetBodyMR()
}
// KeyMR returns the hash of the hash of the Entry Block Header concatenated
// with the Merkle Root of the Entry Block Body. The Body Merkle Root is
// calculated by the func (e *EBlockBody) MR() which is called by the func
// (e *EBlock) BuildHeader().
func (e *EBlock) KeyMR() (interfaces.IHash, error) {
// Sha(Sha(header) + BodyMR)
e.BuildHeader()
h, err := e.HeaderHash()
if err != nil {
return nil, err
}
return primitives.Sha(append(h.Bytes(), e.GetHeader().GetBodyMR().Bytes()...)), nil
}
// MarshalBinary returns the serialized binary form of the Entry Block.
func (e *EBlock) MarshalBinary() (rval []byte, err error) {
defer func(pe *error) {
if *pe != nil {
fmt.Fprintf(os.Stderr, "EBlock.MarshalBinary err:%v", *pe)
}
}(&err)
e.Init()
buf := primitives.NewBuffer(nil)
err = e.BuildHeader()
if err != nil {
return nil, err
}
err = buf.PushBinaryMarshallable(e.GetHeader())
if err != nil {
return nil, err
}
if p, err := e.marshalBodyBinary(); err != nil {
return nil, err
} else {
buf.Write(p)
}
return buf.DeepCopyBytes(), nil
}
func UnmarshalEBlock(data []byte) (interfaces.IEntryBlock, error) {
block, _, err := UnmarshalEBlockData(data)
return block, err
}
func UnmarshalEBlockData(data []byte) (interfaces.IEntryBlock, []byte, error) {
block := NewEBlock()
data, err := block.UnmarshalBinaryData(data)
if err != nil {
return nil, nil, err
}
return block, data, nil
}
// UnmarshalBinary populates the Entry Block object from the serialized binary
// data.
func (e *EBlock) UnmarshalBinaryData(data []byte) (newData []byte, err error) {
newData = data
if e.Header == nil {
e.Header = new(EBlockHeader)
}
newData, err = e.GetHeader().UnmarshalBinaryData(newData)
if err != nil {
return
}
newData, err = e.unmarshalBodyBinaryData(newData)
if err != nil {
return
}
return
}
func (e *EBlock) UnmarshalBinary(data []byte) (err error) {
_, err = e.UnmarshalBinaryData(data)
return
}
// marshalBodyBinary returns a serialized binary Entry Block Body
func (e *EBlock) marshalBodyBinary() (rval []byte, err error) {
defer func(pe *error) {
if *pe != nil {
fmt.Fprintf(os.Stderr, "EBlock.marshalBodyBinary err:%v", *pe)
}
}(&err)
e.Init()
buf := new(primitives.Buffer)
for _, v := range e.GetEntryHashes() {
buf.Write(v.Bytes())
}
return buf.DeepCopyBytes(), nil
}
// unmarshalBodyBinary builds the Entry Block Body from the serialized binary.
func (e *EBlock) unmarshalBodyBinaryData(data []byte) (newData []byte, err error) {
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("Error unmarshalling: %v", r)
}
}()
e.Init()
buf := primitives.NewBuffer(data)
hash := make([]byte, 32)
for i := uint32(0); i < e.GetHeader().GetEntryCount(); i++ {
if _, err := buf.Read(hash); err != nil {
return nil, err
}
h := primitives.NewZeroHash()
h.SetBytes(hash)
e.GetBody().AddEBEntry(h)
}
newData = buf.DeepCopyBytes()
return
}
func (e *EBlock) unmarshalBodyBinary(data []byte) (err error) {
_, err = e.unmarshalBodyBinaryData(data)
return
}
func (e *EBlock) JSONByte() ([]byte, error) {
return primitives.EncodeJSON(e)
}
func (e *EBlock) JSONString() (string, error) {
return primitives.EncodeJSONString(e)
}
func (e *EBlock) String() string {
e.Init()
str := e.GetHeader().String()
str = str + e.GetBody().String()
return str
}
/*****************************************************
* Support Routines
*****************************************************/
// NewEBlock returns a blank initialized Entry Block with all fields zeroed.
func NewEBlock() *EBlock {
e := new(EBlock)
e.Header = NewEBlockHeader()
e.Body = NewEBlockBody()
return e
}