From 88cc3698b3663972cd9b60faf5c14a7e1bbee965 Mon Sep 17 00:00:00 2001
From: Determinant <tederminant@gmail.com>
Date: Thu, 13 Aug 2020 21:11:56 -0400
Subject: WIP: X-to-C transfer

---
 plugin/evm/base_tx.go | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 plugin/evm/base_tx.go

(limited to 'plugin/evm/base_tx.go')

diff --git a/plugin/evm/base_tx.go b/plugin/evm/base_tx.go
new file mode 100644
index 0000000..5ffc58e
--- /dev/null
+++ b/plugin/evm/base_tx.go
@@ -0,0 +1,105 @@
+package evm
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/ava-labs/gecko/ids"
+	"github.com/ava-labs/gecko/vms/components/ava"
+	"github.com/ava-labs/go-ethereum/common"
+)
+
+// Max size of memo field
+// Don't change without also changing avm.maxMemoSize
+const maxMemoSize = 256
+
+var (
+	errVMNil             = errors.New("tx.vm is nil")
+	errWrongBlockchainID = errors.New("wrong blockchain ID provided")
+	errWrongNetworkID    = errors.New("tx was issued with a different network ID")
+	errNilTx             = errors.New("tx is nil")
+	errInvalidID         = errors.New("invalid ID")
+	errOutputsNotSorted  = errors.New("outputs not sorted")
+)
+
+type EVMOutput struct {
+	Address common.Address `serialize:"true" json:"address"`
+	Amount  uint64         `serialize:"true" json:"amount"`
+}
+
+// BaseTx contains fields common to many transaction types. It should be
+// embedded in transaction implementations. The serialized fields of this struct
+// should be exactly the same as those of avm.BaseTx. Do not change this
+// struct's serialized fields without doing the same on avm.BaseTx.
+// TODO: Factor out this and avm.BaseTX
+type BaseTx struct {
+	vm *VM
+	// true iff this transaction has already passed syntactic verification
+	syntacticallyVerified bool
+	// ID of this tx
+	id ids.ID
+	// Byte representation of this unsigned tx
+	unsignedBytes []byte
+	// Byte representation of the signed transaction (ie with credentials)
+	bytes []byte
+
+	// ID of the network on which this tx was issued
+	NetworkID uint32 `serialize:"true" json:"networkID"`
+	// ID of this blockchain. In practice is always the empty ID.
+	// This is only here to match avm.BaseTx's format
+	BlockchainID ids.ID `serialize:"true" json:"blockchainID"`
+	// Outputs
+	Outs []EVMOutput `serialize:"true" json:"outputs"`
+	// Inputs consumed by this tx
+	Ins []*ava.TransferableInput `serialize:"true" json:"inputs"`
+	// Memo field contains arbitrary bytes, up to maxMemoSize
+	Memo []byte `serialize:"true" json:"memo"`
+}
+
+// UnsignedBytes returns the byte representation of this unsigned tx
+func (tx *BaseTx) UnsignedBytes() []byte { return tx.unsignedBytes }
+
+// Bytes returns the byte representation of this tx
+func (tx *BaseTx) Bytes() []byte { return tx.bytes }
+
+// ID returns this transaction's ID
+func (tx *BaseTx) ID() ids.ID { return tx.id }
+
+// Verify returns nil iff this tx is well formed
+func (tx *BaseTx) Verify() error {
+	switch {
+	case tx == nil:
+		return errNilTx
+	case tx.syntacticallyVerified: // already passed syntactic verification
+		return nil
+	case tx.id.IsZero():
+		return errInvalidID
+	case tx.vm == nil:
+		return errVMNil
+	case tx.NetworkID != tx.vm.ctx.NetworkID:
+		return errWrongNetworkID
+	case !tx.vm.ctx.ChainID.Equals(tx.BlockchainID):
+		return errWrongBlockchainID
+	case len(tx.Memo) > maxMemoSize:
+		return fmt.Errorf("memo length, %d, exceeds maximum memo length, %d",
+			len(tx.Memo), maxMemoSize)
+	}
+	//for _, out := range tx.Outs {
+	//	if err := out.Verify(); err != nil {
+	//		return err
+	//	}
+	//}
+	for _, in := range tx.Ins {
+		if err := in.Verify(); err != nil {
+			return err
+		}
+	}
+	switch {
+	//case !ava.IsSortedTransferableOutputs(tx.Outs, Codec):
+	//	return errOutputsNotSorted
+	case !ava.IsSortedAndUniqueTransferableInputs(tx.Ins):
+		return errInputsNotSortedUnique
+	default:
+		return nil
+	}
+}
-- 
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