crunner

Runner/Executor of target smart contract on EVM-based chain at command line.

With crunner, you will be able to use command line to make a call to smart contract's method whether or not such smart contract code is verified or not; provided that you know its ABI (know function signatures).

Core features

• Make call to getter/setter methods
• Make call to RPC-ETH query of balance
• Make call to get estimated gas for setter methods of the same parameters supplied (dry-run)

Install

cargo install crunner

Examples

The following examples are the real commands that you can copy and test it out.

Be careful and mindful when execute Setter call which is destructive and would cost gas fee, so better to adapt the example of command to execute your own transaction.

Estimate gas

$ crunner -a 0xa0feB3c81A36E885B6608DF7f0ff69dB97491b58 \
-c bsc \
--fn-name approve \
--ensure-setter \
--params 0x10ed43c718714eb63d5aa57b78b54704e256024e 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff \
--dry-run-estimate-gas \
--estimate-gas-from-addr 0x5a223cf64f95214032d239ed49a6c91eb43d676c
25242 0.000000005 0.00012621

This is grabbed from on-chain data as seen from this transaction. We just want to estimate gas used for such transaction which results in the similar amount of gas used, and total gas fees.

The same parameters supplied which would be used when actually execute in real transaction. It returns 3 numbers separated by a single space respectively as

1. Amount of gas unit used
2. Gas price in unit of native token of such chain in execution i.e. BNB, ETH, or MATIC.
3. Total gas fees (which is = 1. x 2.)

Getter call

$ crunner -a 0xbA2aE424d960c26247Dd6c32edC70B295c744C43 \
-c bsc \
--fn-name name \
--fn-ret-type String \
Dogecoin

This make a query against a smart contract to get the name of the Dogecoin token contract. For getter call, it requires --fn-ret-type to be supplied which is String in this case.

Setter call

Take an example of Estimate gas with the same of everything except that we exclude --dry-run-estimate-gas, and --estimate-gas-from-addr then such call will be executed on-chain.

The result will shown transaction hash so you can copy it and query it on indexer website like bscscan.com, etherscan.io, or polygonscan.com.

RPC-ETH call

$ crunner -a 0xE2D26507981A4dAaaA8040bae1846C14E0Fb56bF \
-c bsc \
--fn-name balance \
--fn-ret-type U256 \
--rpc-eth
4876566977257765806422 4876.566977257766

Make a RPC-ETH query for balance of the target contract address (in this case, it is BakedBeans contract). Note you need --rpc-eth flag in order to toggle --fn-name to be based on RPC-ETH method name instead of smart contract's method name.

--fn-ret-type is required, and it needs to be U256 in this case.

Right now, RPC-ETH supports only balance query.

Result is shown respectively of balance in Wei, and native token i.e. BNB, ETH, or MATIC.

License

MIT, Wasin Thonkaew