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Specification.md

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Gas limit

By default web3.js uses web3.eth.Contract.method.myMethod().estimateGas(), but this value can differ from the actual gas that will be used, if the contract you are calling depends on the blockhash, blocknumber or any other source of randomness making the gas cost nondeterministic.

E.g.: the MiniMeToken contract which snapshots balances at certain block numbers.

Considering the above-mentioned behavior, the CLI should calculate the recommended gas limit as follows:

  • recommendedGas = estimatedGas, if estimatedGas > upperGasLimit or
  • recommendedGas = estimatedGas * DEFAULT_GAS_FUZZ_FACTOR with a maximum value of upperGasLimit

Where upperGasLimit = latestBlock.gasLimit * LAST_BLOCK_GAS_LIMIT_FACTOR, DEFAULT_GAS_FUZZ_FACTOR = 1.5 and LAST_BLOCK_GAS_LIMIT_FACTOR = 0.95.

See src/util.js#getRecommendedGasLimit. (This should probably be its own library)

The CLI should ignore the gas property of the network from truffle config.