89 lines
2 KiB
Go
89 lines
2 KiB
Go
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package stateroot
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import (
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"sync"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/vm/emit"
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)
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type (
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incompleteRoot struct {
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sync.RWMutex
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// isSent is true state root was already broadcasted.
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isSent bool
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// request is oracle request.
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root *state.MPTRoot
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// sigs contains signature from every oracle node.
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sigs map[string]*rootSig
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}
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rootSig struct {
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// pub is cached public key.
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pub *keys.PublicKey
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// ok is true if signature was verified.
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ok bool
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// sig is state root signature.
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sig []byte
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}
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)
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func newIncompleteRoot() *incompleteRoot {
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return &incompleteRoot{
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sigs: make(map[string]*rootSig),
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}
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}
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func (r *incompleteRoot) reverify() {
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txHash := r.root.GetSignedHash()
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for _, sig := range r.sigs {
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if !sig.ok {
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sig.ok = sig.pub.Verify(sig.sig, txHash.BytesBE())
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}
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}
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}
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func (r *incompleteRoot) addSignature(pub *keys.PublicKey, sig []byte) {
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r.sigs[string(pub.Bytes())] = &rootSig{
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pub: pub,
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ok: r.root != nil,
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sig: sig,
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}
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}
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// finalize checks is either main or backup tx has sufficient number of signatures and returns
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// tx and bool value indicating if it is ready to be broadcasted.
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func (r *incompleteRoot) finalize(stateValidators keys.PublicKeys) (*state.MPTRoot, bool) {
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if r.root == nil {
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return nil, false
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}
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m := smartcontract.GetDefaultHonestNodeCount(len(stateValidators))
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sigs := make([][]byte, 0, m)
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for _, pub := range stateValidators {
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sig, ok := r.sigs[string(pub.Bytes())]
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if ok && sig.ok {
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sigs = append(sigs, sig.sig)
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if len(sigs) == m {
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break
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}
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}
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}
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if len(sigs) != m {
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return nil, false
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}
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w := io.NewBufBinWriter()
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for i := range sigs {
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emit.Bytes(w.BinWriter, sigs[i])
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}
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r.root.Witness = &transaction.Witness{
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InvocationScript: w.Bytes(),
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}
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return r.root, true
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}
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