import unittest, times, eth/rlp, util/json_testing type Transaction = object amount: int time: DateTime sender: string receiver: string Foo = object x: uint64 y: string z: seq[int] Bar = object b: string f: Foo CompressedFoo = object CustomSerialized = object customFoo {.rlpCustomSerialization.}: Foo ignored {.rlpIgnore.}: int rlpFields Foo, x, y, z rlpFields Transaction, sender, receiver, amount proc default(T: typedesc): T = discard proc append*(rlpWriter: var RlpWriter, holder: CustomSerialized, f: Foo) = rlpWriter.append(f.x) rlpWriter.append(f.y.len) rlpWriter.append(holder.ignored) proc read*(rlp: var Rlp, holder: var CustomSerialized, T: type Foo): Foo = result.x = rlp.read(uint64) result.y = newString(rlp.read(int)) holder.ignored = rlp.read(int) * 2 test "encoding and decoding an object": var originalBar = Bar(b: "abracadabra", f: Foo(x: 5'u64, y: "hocus pocus", z: @[100, 200, 300])) var bytes = encode(originalBar) var r = rlpFromBytes(bytes.toRange) var restoredBar = r.read(Bar) check: originalBar == restoredBar var t1 = Transaction(time: now(), amount: 1000, sender: "Alice", receiver: "Bob") bytes = encode(t1) var t2 = bytes.decode(Transaction) check: bytes.hexRepr == "cd85416c69636583426f628203e8" # verifies that Alice comes first t2.time == default(DateTime) t2.sender == "Alice" t2.receiver == "Bob" t2.amount == 1000 test "custom field serialization": var origVal = CustomSerialized(customFoo: Foo(x: 10'u64, y: "y", z: @[]), ignored: 5) var bytes = encode(origVal) var r = rlpFromBytes(bytes.toRange) var restored = r.read(CustomSerialized) check: origVal.customFoo.x == restored.customFoo.x origVal.customFoo.y.len == restored.customFoo.y.len restored.ignored == 10 test "RLP fields count": check: Bar.rlpFieldsCount == 2 Foo.rlpFieldsCount == 3 Transaction.rlpFieldsCount == 3