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transaction_test.go
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transaction_test.go
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package byzcoin
import (
"encoding/binary"
"sync"
"testing"
"github.com/stretchr/testify/require"
"go.dedis.ch/cothority/v3/byzcoin/trie"
"go.dedis.ch/cothority/v3/darc"
"go.dedis.ch/protobuf"
)
func TestTransaction_Signing(t *testing.T) {
// create the darc
signer := darc.NewSignerEd25519(nil, nil)
ids := []darc.Identity{signer.Identity()}
d := darc.NewDarc(darc.InitRules(ids, ids), []byte("genesis darc"))
d.Rules.AddRule("spawn:dummy_kind", d.Rules.GetSignExpr())
require.Nil(t, d.Verify(true))
// create the tx
ctx, err := createOneClientTx(d.GetBaseID(), "dummy_kind", []byte("dummy_value"), signer)
require.NoError(t, err)
// create a db/trie
mdb := trie.NewMemDB()
tr, err := trie.NewTrie(mdb, []byte("my nonce"))
require.NoError(t, err)
sst := &stagingStateTrie{*tr.MakeStagingTrie(), trieCache{}, sync.Mutex{}}
// verification should fail because trie is empty
ctxHash := ctx.Instructions.Hash()
require.NoError(t, err)
require.Error(t, ctx.Instructions[0].Verify(sst, ctxHash))
require.Contains(t, ctx.Instructions[0].Verify(sst, ctxHash).Error(), "key not set")
// set the version, but it's too high, verification should fail
require.NoError(t, setSignerCounter(sst, signer.Identity().String(), 10))
require.Error(t, ctx.Instructions[0].Verify(sst, ctxHash))
require.Contains(t, ctx.Instructions[0].Verify(sst, ctxHash).Error(), "got counter=")
// set the config
config := ChainConfig{
DarcContractIDs: []string{"darc"},
}
configBuf, err := protobuf.Encode(&config)
require.NoError(t, err)
err = sst.StoreAll([]StateChange{
{
InstanceID: NewInstanceID(nil).Slice(),
StateAction: Create,
ContractID: ContractConfigID,
Value: configBuf,
},
})
require.NoError(t, err)
// set the right version, but darc is missing, verification should fail
require.NoError(t, setSignerCounter(sst, signer.Identity().String(), 0))
require.Error(t, ctx.Instructions[0].Verify(sst, ctxHash))
require.Contains(t, ctx.Instructions[0].Verify(sst, ctxHash).Error(), "darc not found")
// verification should fail if the darc is in, but the version number
// is wrong
darcBuf, err := d.ToProto()
require.NoError(t, err)
sc := StateChange{
InstanceID: d.GetBaseID(),
StateAction: Create,
ContractID: ContractDarcID,
Value: darcBuf,
DarcID: d.GetBaseID(),
}
require.NoError(t, sst.StoreAll([]StateChange{sc}))
require.NoError(t, ctx.Instructions[0].Verify(sst, ctxHash))
}
func TestInstruction_DeriveIDArg(t *testing.T) {
inst := Instruction{
InstanceID: NewInstanceID([]byte("new instance")),
}
_, err := inst.DeriveIDArg("", "testID")
require.Error(t, err)
inst.Spawn = &Spawn{ContractID: "test"}
id1, err := inst.DeriveIDArg("", "testID")
require.NoError(t, err)
inst.Spawn.Args = Arguments{{Name: "testID", Value: []byte("testing")}}
id2, err := inst.DeriveIDArg("", "testID")
require.NoError(t, err)
require.NotEqual(t, id1, id2)
}
func setSignerCounter(sst *stagingStateTrie, id string, v uint64) error {
key := publicVersionKey(id)
verBuf := make([]byte, 8)
binary.LittleEndian.PutUint64(verBuf, v)
body := StateChangeBody{
StateAction: Update,
ContractID: "",
Value: verBuf,
DarcID: darc.ID([]byte{}),
}
buf, err := protobuf.Encode(&body)
if err != nil {
return err
}
return sst.Set(key, buf)
}
func createOneClientTx(dID darc.ID, kind string, value []byte, signer darc.Signer) (ClientTransaction, error) {
return createOneClientTxWithCounter(dID, kind, value, signer, 1)
}
func createOneClientTxWithCounter(dID darc.ID, kind string, value []byte, signer darc.Signer, counter uint64) (ClientTransaction, error) {
instr := createSpawnInstr(dID, kind, "data", value)
instr.SignerCounter = []uint64{counter}
instr.SignerIdentities = []darc.Identity{signer.Identity()}
t := ClientTransaction{
Instructions: []Instruction{instr},
}
h := t.Instructions.Hash()
for i := range t.Instructions {
if err := t.Instructions[i].SignWith(h, signer); err != nil {
return t, err
}
}
return t, nil
}
func createClientTxWithTwoInstrWithCounter(dID darc.ID, kind string, value []byte, signer darc.Signer, counter uint64) (ClientTransaction, error) {
instr1 := createSpawnInstr(dID, kind, "", value)
instr1.SignerIdentities = []darc.Identity{signer.Identity()}
instr1.SignerCounter = []uint64{counter}
instr2 := createSpawnInstr(dID, kind, "", value)
instr2.SignerIdentities = []darc.Identity{signer.Identity()}
instr2.SignerCounter = []uint64{counter + 1}
t := ClientTransaction{
Instructions: []Instruction{instr1, instr2},
}
h := t.Instructions.Hash()
for i := range t.Instructions {
if err := t.Instructions[i].SignWith(h, signer); err != nil {
return t, err
}
}
return t, nil
}
func createSpawnInstr(dID darc.ID, contractID string, argName string, value []byte) Instruction {
return Instruction{
InstanceID: NewInstanceID(dID),
Spawn: &Spawn{
ContractID: contractID,
Args: Arguments{{Name: argName, Value: value}},
},
version: CurrentVersion,
}
}
func createInvokeInstr(dID InstanceID, contractID, cmd, argName string, value []byte) Instruction {
return Instruction{
InstanceID: dID,
Invoke: &Invoke{
ContractID: contractID,
Command: cmd,
Args: Arguments{{Name: argName, Value: value}},
},
version: CurrentVersion,
}
}
func combineInstrsAndSign(signer darc.Signer, instrs ...Instruction) (ClientTransaction, error) {
for i := range instrs {
instrs[i].SignerIdentities = []darc.Identity{signer.Identity()}
}
t := NewClientTransaction(CurrentVersion, instrs...)
h := t.Instructions.Hash()
for i := range t.Instructions {
if err := t.Instructions[i].SignWith(h, signer); err != nil {
return t, err
}
}
return t, nil
}