2018-08-07 08:59:54 +00:00
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import
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json, macros, sequtils, endians,
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eth_common, stint, nimcrypto, byteutils
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type
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ValidatorRecord = object
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# The validator's public key
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pubkey: Uint256
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# What shard the validator's balance will be sent to
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# after withdrawal
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withdrawal_shard: int16
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# And what address
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withdrawal_address: EthAddress
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# The validator's current RANDAO beacon commitment
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randao_commitment: Hash256
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# Current balance
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balance: int64
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# Dynasty where the validator is inducted
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start_dynasty: int64
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# Dynasty where the validator leaves
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end_dynasty: int64
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macro typeToJson*(T: typedesc): untyped =
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## Transform a Nim type section in a Json schema
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## TODO: Add the possibility to force in lexicographical order
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let impl = T.getTypeImpl[1].getTypeImpl # Access type implementation as a tree
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var jsonType: JsonNode = newJObject()
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for field in impl[2]:
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let (fieldName, fieldType) = ($field[0], $field[1]) # convert name and type to string
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jsonType[fieldName] = %fieldType # % creates a JsonNode from the string that we assign to key = fieldName.
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result = newStrLitNode($jsonType)
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proc appendBigEndianInt(dst: var seq[byte], src: SomeNumber) =
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## Append an int as a big-endian int to a sequence of bytes
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const size = sizeof(src)
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proc bigEndian(dst, src: pointer) =
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when size == 2: # int16
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bigEndian16(dst, src)
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elif size == 4: # int32
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bigEndian32(dst, src)
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elif size == 8: # int64
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bigEndian64(dst, src)
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else:
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static: assert false, "src must be a int16, int32 or int64 or unsigned int of the same size"
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dst.setLen(dst.len + size)
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bigEndian(dst[dst.len - size].addr, src.unsafeAddr)
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proc serializeETH[T](x: T): seq[byte] =
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## Serialize an Ethereum type to the PoC serialization format
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const
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magic = mapLiterals(['\x61','E','T','H','E','R','E','U','M'], byte)
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version = [byte 1, 0]
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schema = typeToJson(T)
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result = @[]
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result.add magic
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result.add version
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# Offset of the raw data (stored as int64 even on 32-bit platform):
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# - 9 bytes of magic header
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# - 2 bytes for version
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# - 8 bytes for offset (int64)
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# - 32 bytes for Blake2 hash for raw data
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2018-08-07 09:05:40 +00:00
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# - ??? bytes for schema
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2018-08-07 08:59:54 +00:00
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let
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offset = int64(result.len + sizeof(int64) + sizeof(Hash256) + schema.len)
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metadataStart = result.len + sizeof(int64)
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# Write the offset as a Big Endian int64
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result.setLen(result.len + sizeof(int64))
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bigEndian64(result[result.len - sizeof(int64)].addr, offset.unsafeAddr)
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# Reserve space for Blake2 hash (256-bit / 32 bytes)
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result.setLen(result.len + sizeof(Hash256))
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# Write the schema (we need to reinterpret the string literal as an array of byte)
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result.add cast[array[schema.len, byte]](schema)
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# Write raw data - this is similar to SimpleSerialize
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for field in fields(x):
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when field is UInt256:
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result.add field.toByteArrayBE
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elif field is (int16 or int64):
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result.appendBigEndianInt field
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elif field is EthAddress:
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result.add field
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elif field is Hash256:
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result.add field.data
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else:
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raise newException(ValueError, "Not implemented")
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# Compute the hash
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result[metadataStart .. metadataStart + sizeof(Hash256)] = blake2_256.digest(result[offset ..< result.len]).data
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# Some reports
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echo "Schema: " & $schema
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echo "Schema size: " & $schema.len
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echo "Raw data offset (== metadata size): " & $offset
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echo "Raw data size (bytes): " & $(result.len - offset)
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echo "Total size (bytes): " & $result.len
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when isMainModule:
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let x = ValidatorRecord(
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pubkey: 123456789.u256,
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withdrawal_shard: 4455,
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withdrawal_address: hexToPaddedByteArray[20]("0x1234"),
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randao_commitment: Hash256(data: hexToPaddedByteArray[32]("0xAABBCCDDEEFF")),
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balance: 100000,
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start_dynasty: 1,
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end_dynasty: 2
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)
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let y = serializeETH(x)
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echo "\n##################### \n"
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echo "Byte representation \n"
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# Byte representation
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echo y
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echo "\n##################### \n"
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echo "Char representation \n"
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echo cast[seq[char]](y)
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echo "\n##################### \n"
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echo "Hex representation \n"
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echo byteutils.toHex y
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#################################################################################
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# Output
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# Schema: {"pubkey":"UInt256","withdrawal_shard":"int16","withdrawal_address":"EthAddress","randao_commitment":"Hash256","balance":"int64","start_dynasty":"int64","end_dynasty":"int64"}
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# Schema size: 175
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# Raw data offset: 226
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# Raw data size (bytes): 109
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# Total size (bytes): 335
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#
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# #####################
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#
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# Byte representation
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#
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# @[97, 69, 84, 72, 69, 82, 69, 85, 77, 1, 0, 0, 0, 0, 0, 0, 0, 0, 226, 213, 67, 87, 156, 127, 178, 250, 140, 247, 198, 251, 179, 75, 124, 44, 121, 216, 1, 99, 44, 174, 253, 237, 4, 78, 77, 191, 227, 39, 25, 132, 187, 192, 52, 3, 1, 0, 0, 0, 14, 0, 0, 0, 0, 0, 0, 0, 13, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 26, 0,0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 13, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, 0, 14, 0, 0, 0, 0, 0, 0, 1, 160, 183, 145, 236, 254, 127, 0, 0, 45, 169, 48, 3, 1, 0, 0, 0, 169, 13, 0, 0, 0, 0, 0, 0, 53, 158, 48, 3, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 32, 0, 0, 0, 0, 0, 0, 0, 64, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0,0, 0, 0, 0, 0, 2, 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, 0, 0, 0, 7, 91, 205, 21, 17, 103, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 18, 52, 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, 170, 187, 204, 221, 238, 255, 0, 0, 0, 0, 0, 1, 134, 160, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 2]
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#
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# #####################
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#
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# Char representation
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#
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# @['a', 'E', 'T', 'H', 'E', 'R', 'E', 'U', 'M', '\x01', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\xE2', '\xD5', 'C', 'W', '\x9C', '\x7F', '\xB2', '\xFA', '\x8C', '\xF7', '\xC6', '\xFB', '\xB3', 'K', '|', ',', 'y', '\xD8', '\x01', 'c', ',', '\xAE', '\xFD', '\xED', '\x04', 'N', 'M', '\xBF', '\xE3', '\'', '\x19', '\x84', '\xBB', '\xC0', '4', '\x03', '\x01', '\x00', '\x00', '\x00', '\x0E', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\c', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x04', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x1A', '\x00','\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x06', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\c', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\f', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x0E', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x01', '\xA0', '\xB7', '\x91', '\xEC', '\xFE', '\x7F', '\x00', '\x00', '-','\xA9', '0', '\x03', '\x01', '\x00', '\x00', '\x00', '\xA9', '\c', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '5', '\x9E', '0', '\x03', '\x01', '\x00', '\x00', '\x00', '\x00', '\x00', '\x01', '\x00', '\x01', '\x00', '\x00', '\x00', '\x04', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', ' ', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '@', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\f', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\f', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x02', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\a', '[', '\xCD', '\x15', '\x11', 'g', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x12', '4', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\xAA', '\xBB', '\xCC', '\xDD', '\xEE', '\xFF', '\x00', '\x00', '\x00', '\x00', '\x00', '\x01', '\x86', '\xA0', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x01', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x02']
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#
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# #####################
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#
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# Hex representation
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#
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# 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