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addServer.go
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addServer.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 messages
import (
"bytes"
"encoding/binary"
"fmt"
"os"
"reflect"
"github.com/DCNT-Hammer/dcnt/common/constants"
"github.com/DCNT-Hammer/dcnt/common/interfaces"
"github.com/DCNT-Hammer/dcnt/common/primitives"
"github.com/DCNT-Hammer/dcnt/common/messages/msgbase"
log "github.com/sirupsen/logrus"
)
// Communicate a Directory Block State
type AddServerMsg struct {
msgbase.MessageBase
Timestamp interfaces.Timestamp // Message Timestamp
ServerChainID interfaces.IHash // ChainID of new server
ServerType int // 0 = Federated, 1 = Audit
Signature interfaces.IFullSignature
}
var _ interfaces.IMsg = (*AddServerMsg)(nil)
var _ interfaces.Signable = (*AddServerMsg)(nil)
func (m *AddServerMsg) GetRepeatHash() (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("AddServerMsg.GetRepeatHash() saw an interface that was nil")
}
}()
return m.GetMsgHash()
}
func (m *AddServerMsg) 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("AddServerMsg.GetHash() saw an interface that was nil")
}
}()
return m.GetMsgHash()
}
func (m *AddServerMsg) GetMsgHash() (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("AddServerMsg.GetMsgHash() saw an interface that was nil")
}
}()
if m.MsgHash == nil {
data, err := m.MarshalForSignature()
if err != nil {
return nil
}
m.MsgHash = primitives.Sha(data)
}
return m.MsgHash
}
func (m *AddServerMsg) Type() byte {
return constants.ADDSERVER_MSG
}
func (m *AddServerMsg) GetTimestamp() interfaces.Timestamp {
return m.Timestamp
}
func (m *AddServerMsg) Validate(state interfaces.IState) int {
//return 1
authoritativeKey := state.GetNetworkSkeletonKey().Bytes()
if m.GetSignature() == nil || bytes.Compare(m.GetSignature().GetKey(), authoritativeKey) != 0 {
// the message was not signed with the proper authoritative signing key (from conf file)
// it is therefore considered invalid
return -1
}
isVer, err := m.VerifySignature()
if err != nil || !isVer {
// if there is an error during signature verification
// or if the signature is invalid
// the message is considered invalid
return -1
}
return 1
}
// Returns true if this is a message for this server to execute as
// a leader.
func (m *AddServerMsg) ComputeVMIndex(state interfaces.IState) {
m.VMIndex = state.ComputeVMIndex(constants.ADMIN_CHAINID)
}
// Execute the leader functions of the given message
func (m *AddServerMsg) LeaderExecute(state interfaces.IState) {
state.LeaderExecute(m)
}
func (m *AddServerMsg) FollowerExecute(state interfaces.IState) {
state.FollowerExecuteMsg(m)
}
// Acknowledgements do not go into the process list.
func (e *AddServerMsg) Process(dbheight uint32, state interfaces.IState) bool {
return state.ProcessAddServer(dbheight, e)
}
func (e *AddServerMsg) JSONByte() ([]byte, error) {
return primitives.EncodeJSON(e)
}
func (e *AddServerMsg) JSONString() (string, error) {
return primitives.EncodeJSONString(e)
}
func (m *AddServerMsg) Sign(key interfaces.Signer) error {
signature, err := msgbase.SignSignable(m, key)
if err != nil {
return err
}
m.Signature = signature
return nil
}
func (m *AddServerMsg) GetSignature() interfaces.IFullSignature {
return m.Signature
}
func (m *AddServerMsg) VerifySignature() (bool, error) {
return msgbase.VerifyMessage(m)
}
func (m *AddServerMsg) UnmarshalBinaryData(data []byte) (newData []byte, err error) {
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("Error unmarshalling Add Server Message: %v", r)
}
}()
newData = data
if newData[0] != m.Type() {
return nil, fmt.Errorf("Invalid Message type")
}
newData = newData[1:]
m.Timestamp = new(primitives.Timestamp)
newData, err = m.Timestamp.UnmarshalBinaryData(newData)
if err != nil {
return nil, err
}
m.ServerChainID = new(primitives.Hash)
newData, err = m.ServerChainID.UnmarshalBinaryData(newData)
if err != nil {
return nil, err
}
m.ServerType = int(newData[0])
newData = newData[1:]
if len(newData) > 32 {
m.Signature = new(primitives.Signature)
newData, err = m.Signature.UnmarshalBinaryData(newData)
if err != nil {
return nil, err
}
}
return
}
func (m *AddServerMsg) UnmarshalBinary(data []byte) error {
_, err := m.UnmarshalBinaryData(data)
return err
}
func (m *AddServerMsg) MarshalForSignature() (rval []byte, err error) {
defer func(pe *error) {
if *pe != nil {
fmt.Fprintf(os.Stderr, "AddServerMsg.MarshalForSignature err:%v", *pe)
}
}(&err)
var buf primitives.Buffer
buf.Write([]byte{m.Type()})
if d, err := m.Timestamp.MarshalBinary(); err != nil {
return nil, err
} else {
buf.Write(d)
}
d, err := m.ServerChainID.MarshalBinary()
if err != nil {
return nil, err
}
buf.Write(d)
binary.Write(&buf, binary.BigEndian, uint8(m.ServerType))
return buf.DeepCopyBytes(), nil
}
func (m *AddServerMsg) MarshalBinary() (rval []byte, err error) {
defer func(pe *error) {
if *pe != nil {
fmt.Fprintf(os.Stderr, "AddServerMsg.MarshalBinary err:%v", *pe)
}
}(&err)
var buf primitives.Buffer
data, err := m.MarshalForSignature()
if err != nil {
return nil, err
}
buf.Write(data)
if m.Signature != nil {
data, err = m.Signature.MarshalBinary()
if err != nil {
return nil, err
}
buf.Write(data)
}
return buf.DeepCopyBytes(), nil
}
func (m *AddServerMsg) String() string {
var stype string
if m.ServerType == 0 {
stype = "Federated"
} else {
stype = "Audit"
}
return fmt.Sprintf("AddServer (%s): ChainID: %x Time: %x Msg Hash %x ",
stype,
m.ServerChainID.Bytes()[3:6],
&m.Timestamp,
m.GetMsgHash().Bytes()[:3])
}
func (m *AddServerMsg) LogFields() log.Fields {
return log.Fields{"category": "message", "messagetype": "addserver", "server": m.ServerChainID.String(),
"hash": m.GetHash().String()}
}
func (m *AddServerMsg) IsSameAs(b *AddServerMsg) bool {
if b == nil {
return false
}
if m.Timestamp.GetTimeMilli() != b.Timestamp.GetTimeMilli() {
return false
}
if !m.ServerChainID.IsSameAs(b.ServerChainID) {
return false
}
if m.ServerType != b.ServerType {
return false
}
if m.Signature == nil && b.Signature != nil {
return false
}
if m.Signature != nil {
if m.Signature.IsSameAs(b.Signature) == false {
return false
}
}
return true
}
func NewAddServerMsg(state interfaces.IState, serverType int) interfaces.IMsg {
msg := new(AddServerMsg)
msg.ServerChainID = state.GetIdentityChainID()
msg.ServerType = serverType
msg.Timestamp = state.GetTimestamp()
return msg
}
func NewAddServerByHashMsg(state interfaces.IState, serverType int, newServerHash interfaces.IHash) interfaces.IMsg {
msg := new(AddServerMsg)
msg.ServerChainID = newServerHash
msg.ServerType = serverType
msg.Timestamp = state.GetTimestamp()
return msg
}