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badger_node.go
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badger_node.go
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package storage
import (
"bytes"
"encoding/hex"
"fmt"
"github.com/MixinNetwork/mixin/common"
"github.com/MixinNetwork/mixin/crypto"
"github.com/dgraph-io/badger"
)
const (
graphPrefixNodePledge = "NODESTATEPLEDGE"
graphPrefixNodeAccept = "NODESTATEACCEPT"
graphPrefixNodeDepart = "NODESTATEDEPART"
graphPrefixNodeRemove = "NODESTATEREMOVE"
)
func (s *BadgerStore) ReadConsensusNodes() []*common.Node {
nodes := make([]*common.Node, 0)
txn := s.snapshotsDB.NewTransaction(false)
defer txn.Discard()
accepted := readNodesInState(txn, graphPrefixNodeAccept)
for _, n := range accepted {
n.State = common.NodeStateAccepted
nodes = append(nodes, n)
}
pledging := readNodesInState(txn, graphPrefixNodePledge)
for _, n := range pledging {
n.State = common.NodeStatePledging
nodes = append(nodes, n)
}
departing := readNodesInState(txn, graphPrefixNodeDepart)
for _, n := range departing {
n.State = common.NodeStateDeparting
nodes = append(nodes, n)
}
return nodes
}
func readNodesInState(txn *badger.Txn, nodeState string) []*common.Node {
it := txn.NewIterator(badger.DefaultIteratorOptions)
defer it.Close()
prefix := []byte(nodeState)
nodes := make([]*common.Node, 0)
for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
item := it.Item()
signer := nodeSignerForState(item.Key(), nodeState)
ival, err := item.ValueCopy(nil)
if err != nil {
panic(err)
}
payee := nodePayee(ival)
nodes = append(nodes, &common.Node{
Signer: signer,
Payee: payee,
})
}
return nodes
}
func writeNodeAccept(txn *badger.Txn, signer, payee crypto.Key, tx crypto.Hash, genesis bool) error {
// TODO these checks are only assert kind checks, not needed at all
key := nodePledgeKey(signer)
item, err := txn.Get(key)
if err == badger.ErrKeyNotFound {
if !genesis {
return fmt.Errorf("node not pledging yet %s", signer.String())
}
} else if err != nil {
return err
}
if !genesis {
ival, err := item.ValueCopy(nil)
if err != nil {
return err
}
if bytes.Compare(payee[:], ival[:len(payee)]) != 0 {
return fmt.Errorf("node not accept to the same payee account %s %s", hex.EncodeToString(ival[:len(payee)]), payee.String())
}
}
err = txn.Delete(key)
if err != nil {
return err
}
key = nodeAcceptKey(signer)
return txn.Set(key, append(payee[:], tx[:]...))
}
func writeNodePledge(txn *badger.Txn, signer, payee crypto.Key, tx crypto.Hash) error {
// TODO these checks are only assert kind checks, not needed at all
key := nodeAcceptKey(signer)
_, err := txn.Get(key)
if err == nil {
return fmt.Errorf("node already accepted %s", signer.String())
} else if err != badger.ErrKeyNotFound {
return err
}
pledging := readNodesInState(txn, graphPrefixNodePledge)
if len(pledging) > 0 {
node := pledging[0]
return fmt.Errorf("node %s is pledging", node.Signer.PublicSpendKey.String())
}
departing := readNodesInState(txn, graphPrefixNodeDepart)
if len(departing) > 0 {
node := departing[0]
return fmt.Errorf("node %s is departing", node.Signer.PublicSpendKey.String())
}
key = nodePledgeKey(signer)
return txn.Set(key, append(payee[:], tx[:]...))
}
func nodeSignerForState(key []byte, nodeState string) common.Address {
var publicSpend crypto.Key
copy(publicSpend[:], key[len(nodeState):])
privateView := publicSpend.DeterministicHashDerive()
return common.Address{
PrivateViewKey: privateView,
PublicViewKey: privateView.Public(),
PublicSpendKey: publicSpend,
}
}
func nodePayee(ival []byte) common.Address {
var publicSpend crypto.Key
copy(publicSpend[:], ival[:len(publicSpend)])
privateView := publicSpend.DeterministicHashDerive()
return common.Address{
PrivateViewKey: privateView,
PublicViewKey: privateView.Public(),
PublicSpendKey: publicSpend,
}
}
func nodePledgeKey(publicSpend crypto.Key) []byte {
return append([]byte(graphPrefixNodePledge), publicSpend[:]...)
}
func nodeAcceptKey(publicSpend crypto.Key) []byte {
return append([]byte(graphPrefixNodeAccept), publicSpend[:]...)
}
func nodeDepartKey(publicSpend crypto.Key) []byte {
return append([]byte(graphPrefixNodeDepart), publicSpend[:]...)
}