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MIN_DEPOSIT: constant(uint256) = 1 # ETH
MAX_DEPOSIT: constant(uint256) = 32 # ETH
GWEI_PER_ETH: constant(uint256) = 1000000000 # 10**9
CHAIN_START_FULL_DEPOSIT_THRESHOLD: constant(uint256) = 16384 # 2**14
DEPOSIT_CONTRACT_TREE_DEPTH: constant(uint256) = 32
TWO_TO_POWER_OF_TREE_DEPTH: constant(uint256) = 4294967296 # 2**32
SECONDS_PER_DAY: constant(uint256) = 86400
Deposit: event({previous_deposit_root: bytes32, data: bytes[2064], merkle_tree_index: bytes[8]})
ChainStart: event({deposit_root: bytes32, time: bytes[8]})
deposit_tree: map(uint256, bytes32)
deposit_count: uint256
full_deposit_count: uint256
@payable
@public
def deposit(deposit_input: bytes[2048]):
assert msg.value >= as_wei_value(MIN_DEPOSIT, "ether")
assert msg.value <= as_wei_value(MAX_DEPOSIT, "ether")
index: uint256 = self.deposit_count + TWO_TO_POWER_OF_TREE_DEPTH
msg_gwei_bytes8: bytes[8] = slice(concat("", convert(msg.value / GWEI_PER_ETH, bytes32)), start=24, len=8)
timestamp_bytes8: bytes[8] = slice(concat("", convert(block.timestamp, bytes32)), start=24, len=8)
deposit_data: bytes[2064] = concat(msg_gwei_bytes8, timestamp_bytes8, deposit_input)
merkle_tree_index: bytes[8] = slice(concat("", convert(index, bytes32)), start=24, len=8)
log.Deposit(self.deposit_tree[1], deposit_data, merkle_tree_index)
# add deposit to merkle tree
self.deposit_tree[index] = sha3(deposit_data)
for i in range(DEPOSIT_CONTRACT_TREE_DEPTH): # DEPOSIT_CONTRACT_TREE_DEPTH (range of constant var not yet supported)
index /= 2
self.deposit_tree[index] = sha3(concat(self.deposit_tree[index * 2], self.deposit_tree[index * 2 + 1]))
self.deposit_count += 1
if msg.value == as_wei_value(MAX_DEPOSIT, "ether"):
self.full_deposit_count += 1
if self.full_deposit_count == CHAIN_START_FULL_DEPOSIT_THRESHOLD:
timestamp_day_boundary: uint256 = as_unitless_number(block.timestamp) - as_unitless_number(block.timestamp) % SECONDS_PER_DAY + SECONDS_PER_DAY
timestamp_day_boundary_bytes8: bytes[8] = slice(concat("", convert(timestamp_day_boundary, bytes32)), start=24, len=8)
log.ChainStart(self.deposit_tree[1], timestamp_day_boundary_bytes8)
@public
@constant
def get_deposit_root() -> bytes32:
return self.deposit_tree[1]
@public
@constant
def get_branch(leaf: uint256) -> bytes32[32]: # size is DEPOSIT_CONTRACT_TREE_DEPTH (symbolic const not supported)
branch: bytes32[32] # size is DEPOSIT_CONTRACT_TREE_DEPTH
index: uint256 = leaf + TWO_TO_POWER_OF_TREE_DEPTH
for i in range(DEPOSIT_CONTRACT_TREE_DEPTH):
branch[i] = self.deposit_tree[bitwise_xor(index, 1)]
index /= 2
return branch