private/blockchain: generic types for wallet/transactions

Change-Id: I32a77c58ee519059bf6cd42e0db829d5104843a4

private/blockchain/types.go

@@ -0,0 +1,58 @@
+// Copyright (C) 2022 Storj Labs, Inc.
+// See LICENSE for copying information.
+
+package blockchain
+
+import (
+	"encoding/hex"
+	"encoding/json"
+
+	"github.com/zeebo/errs"
+)
+
+// Error for the package (mainly parsing errors).
+var Error = errs.Class("blockchain")
+
+// Lengths of hashes and addresses in bytes.
+const (
+	// HashLength is the expected length of the hash.
+	HashLength = 32
+	// AddressLength is the expected length of the address.
+	AddressLength = 20
+)
+
+// Hash represents the 32 byte Keccak256 hash of arbitrary data.
+type Hash [HashLength]byte
+
+var _ json.Marshaler = Hash{}
+
+// MarshalJSON implements json marshalling interface.
+func (h Hash) MarshalJSON() ([]byte, error) {
+	return json.Marshal(h.Hex())
+}
+
+// Bytes gets the byte representation of the underlying hash.
+func (h Hash) Bytes() []byte { return h[:] }
+
+// Hex gets the hex string representation of the underlying hash.
+func (h Hash) Hex() string {
+	return hex.EncodeToString(h.Bytes())
+}
+
+// Address is wallet address.
+type Address [AddressLength]byte
+
+var _ json.Marshaler = Address{}
+
+// MarshalJSON implements json marshalling interface.
+func (a Address) MarshalJSON() ([]byte, error) {
+	return json.Marshal(a.Hex())
+}
+
+// Bytes gets the byte representation of the underlying address.
+func (a Address) Bytes() []byte { return a[:] }
+
+// Hex gets string representation of the underlying address.
+func (a Address) Hex() string {
+	return hex.EncodeToString(a.Bytes())
+}