starcoin-framework

Module 0x1::TransactionTimeout

A module used to check expiration time of transactions.

• Function is_valid_transaction_timestamp
• Module Specification

use 0x1::Block;
use 0x1::Timestamp;
use 0x1::TransactionTimeoutConfig;

Function is_valid_transaction_timestamp

Check whether the given timestamp is valid for transactions.

public fun is_valid_transaction_timestamp(txn_timestamp: u64): bool

Implementation

public fun is_valid_transaction_timestamp(txn_timestamp: u64): bool {
  let current_block_time = Timestamp::now_seconds();
  let block_number = Block::get_current_block_number();
  // before first block, just require txn_timestamp > genesis timestamp.
  if (block_number == 0) {
    return txn_timestamp > current_block_time
  };
  let timeout = TransactionTimeoutConfig::duration_seconds();
  let max_txn_time = current_block_time + timeout;
  current_block_time < txn_timestamp && txn_timestamp < max_txn_time
}

Specification

aborts_if !exists<Timestamp::CurrentTimeMilliseconds>(CoreAddresses::GENESIS_ADDRESS());
aborts_if !exists<Block::BlockMetadata>(CoreAddresses::GENESIS_ADDRESS());
include Timestamp::AbortsIfTimestampNotExists;
aborts_if Block::get_current_block_number() != 0 && Timestamp::now_seconds() + TransactionTimeoutConfig::duration_seconds() > max_u64();
aborts_if Block::get_current_block_number() != 0 && !exists<Config::Config<TransactionTimeoutConfig::TransactionTimeoutConfig>>(CoreAddresses::GENESIS_ADDRESS());

schema AbortsIfTimestampNotValid {
    aborts_if !exists<Timestamp::CurrentTimeMilliseconds>(CoreAddresses::GENESIS_ADDRESS());
    aborts_if !exists<Block::BlockMetadata>(CoreAddresses::GENESIS_ADDRESS());
    include Timestamp::AbortsIfTimestampNotExists;
    aborts_if Block::get_current_block_number() != 0 && Timestamp::now_seconds() + TransactionTimeoutConfig::duration_seconds() > max_u64();
    aborts_if Block::get_current_block_number() != 0 && !exists<Config::Config<TransactionTimeoutConfig::TransactionTimeoutConfig>>(CoreAddresses::GENESIS_ADDRESS());
}

Module Specification

pragma verify;
pragma aborts_if_is_strict;

fun spec_is_valid_transaction_timestamp(txn_timestamp: u64):bool {
 if (Block::get_current_block_number() == 0) {
   txn_timestamp > Timestamp::now_seconds()
 } else {
     Timestamp::now_seconds() < txn_timestamp && txn_timestamp <
     (Timestamp::now_seconds() + TransactionTimeoutConfig::duration_seconds())
 }
}

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