Add governance VAA initializer

Change-Id: I4c5a050e5b17ed8b278f91e26bf61adacc45ecc5

node/pkg/vaa/governance.go

@@ -0,0 +1,25 @@
+package vaa
+
+import (
+	"time"
+)
+
+var governanceEmitter = Address{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4}
+var governanceChain = ChainIDSolana
+
+func CreateGovernanceVAA(nonce uint32, sequence uint64, guardianSetIndex uint32, payload []byte) *VAA {
+	vaa := &VAA{
+		Version:          1,
+		GuardianSetIndex: guardianSetIndex,
+		Signatures:       nil,
+		Timestamp:        time.Unix(0, 0),
+		Nonce:            nonce,
+		Sequence:         sequence,
+		ConsistencyLevel: 32,
+		EmitterChain:     governanceChain,
+		EmitterAddress:   governanceEmitter,
+		Payload:          payload,
+	}
+
+	return vaa
+}

node/pkg/vaa/types_test.go

@@ -101,3 +101,12 @@ func TestBodyRegisterChain_Serialize(t *testing.T) {
 	data := msg.Serialize()
 	require.Equal(t, "000000000000000000000000000000000000000000546f6b656e42726964676501000000080102030400000000000000000000000000000000000000000000000000000000", hex.EncodeToString(data))
 }
+
+func TestBodyRegisterChain_Serializee(t *testing.T) {
+	payload, _ := hex.DecodeString("000000000000000000000000000000000000000000546f6b656e42726964676501000000080102030400000000000000000000000000000000000000000000000000000000")
+	key, _ := crypto.HexToECDSA("cfb12303a19cde580bb4dd771639b0d26bc68353645571a8cff516ab2ee113a0")
+	vaa := CreateGovernanceVAA(12, 38, 1, payload)
+	vaa.AddSignature(key, 0)
+	vaaData, _ := vaa.Marshal()
+	require.Equal(t, "01000000010100c764f98742e6dce38580d0502d60b16404336148cf7364c07ee4bb96a1b2b8072c36ae911f0896e505dbb5b543ca338b3867cdabb5579e5f0c5f5d575f12da0700000000000000000c00010000000000000000000000000000000000000000000000000000000000000004000000000000002620000000000000000000000000000000000000000000546f6b656e42726964676501000000080102030400000000000000000000000000000000000000000000000000000000", hex.EncodeToString(vaaData))
+}