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eth2.0-specs
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Truncate the index into the Merkle tree to bytes[8] 

The beacon chain expects a `uint64` in part to avoid big-int computation.
This commit updates the `Deposit` log so that it broadcasts data of the
appropriate size.
This commit is contained in:
Alex Stokes 2019-01-09 17:18:15 -06:00
parent d62834654f
commit 4cf06d908a
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GPG Key ID: 51CE1721B245C086
1 changed files with 6 additions and 5 deletions
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11
specs/core/0_beacon-chain.md
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@ -653,7 +653,7 @@ 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: uint256})
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)
@ -666,18 +666,19 @@ def deposit(deposit_input: bytes[2048]):
assert msg.value >= as_wei_value(MIN_DEPOSIT, "ether")
assert msg.value <= as_wei_value(MAX_DEPOSIT, "ether")
merkle_tree_index: uint256 = self.deposit_count + TWO_TO_POWER_OF_TREE_DEPTH
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[merkle_tree_index] = sha3(deposit_data)
self.deposit_tree[index] = sha3(deposit_data)
for i in range(DEPOSIT_CONTRACT_TREE_DEPTH):
merkle_tree_index /= 2
self.deposit_tree[merkle_tree_index] = sha3(concat(self.deposit_tree[merkle_tree_index * 2], self.deposit_tree[merkle_tree_index * 2 + 1]))
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"):