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initial_state.go
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/
initial_state.go
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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package avm
import (
"bytes"
"errors"
"sort"
"github.com/ava-labs/avalanchego/codec"
"github.com/ava-labs/avalanchego/utils"
"github.com/ava-labs/avalanchego/vms/components/verify"
)
var (
errNilInitialState = errors.New("nil initial state is not valid")
errNilFxOutput = errors.New("nil feature extension output is not valid")
errOutputsNotSorted = errors.New("outputs not sorted")
)
// InitialState ...
type InitialState struct {
FxID uint32 `serialize:"true" json:"fxID"`
Outs []verify.State `serialize:"true" json:"outputs"`
}
// Verify implements the verify.Verifiable interface
func (is *InitialState) Verify(c codec.Manager, numFxs int) error {
switch {
case is == nil:
return errNilInitialState
case is.FxID >= uint32(numFxs):
return errUnknownFx
}
for _, out := range is.Outs {
if out == nil {
return errNilFxOutput
}
if err := out.Verify(); err != nil {
return err
}
}
if !isSortedState(is.Outs, c) {
return errOutputsNotSorted
}
return nil
}
// Sort ...
func (is *InitialState) Sort(c codec.Manager) { sortState(is.Outs, c) }
type innerSortState struct {
vers []verify.State
codec codec.Manager
}
func (vers *innerSortState) Less(i, j int) bool {
iVer := vers.vers[i]
jVer := vers.vers[j]
iBytes, err := vers.codec.Marshal(codecVersion, &iVer)
if err != nil {
return false
}
jBytes, err := vers.codec.Marshal(codecVersion, &jVer)
if err != nil {
return false
}
return bytes.Compare(iBytes, jBytes) == -1
}
func (vers *innerSortState) Len() int { return len(vers.vers) }
func (vers *innerSortState) Swap(i, j int) { v := vers.vers; v[j], v[i] = v[i], v[j] }
func sortState(vers []verify.State, c codec.Manager) {
sort.Sort(&innerSortState{vers: vers, codec: c})
}
func isSortedState(vers []verify.State, c codec.Manager) bool {
return sort.IsSorted(&innerSortState{vers: vers, codec: c})
}
type innerSortInitialState []*InitialState
func (iss innerSortInitialState) Less(i, j int) bool { return iss[i].FxID < iss[j].FxID }
func (iss innerSortInitialState) Len() int { return len(iss) }
func (iss innerSortInitialState) Swap(i, j int) { iss[j], iss[i] = iss[i], iss[j] }
func sortInitialStates(iss []*InitialState) { sort.Sort(innerSortInitialState(iss)) }
func isSortedAndUniqueInitialStates(iss []*InitialState) bool {
return utils.IsSortedAndUnique(innerSortInitialState(iss))
}