Gaster

The utility to get transactions data for the specified smart contract

• The output can be used to analyze gas usage
• Supports smart contracts deployed with Zeppelin OS

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Setup

• Install node package manager npm

• Install Gaster from npm:

npm install [-g] gaster

• Or install Gaster from github:

npm install [-g] 'https://github.com/exyte/gaster'

Usage

CLI

$ gaster <address> <options>

• <address>: [string] Smart contract address

Options:

• -s, --startblock: [number, optional] Start block number. Default: smart contract genesis block.
• -e, --endblock: [number, optional] End block number. Default: smart contract last transaction block.
• -n, --net: [boolean, optional] Network on which specified smart contract is deployed.
• -a,--abi: [string, optional] Path to *.json file with Ethereum smart contracts' ABIs in appropriate format.
• -r,--recursive: [boolean, optional] Search transactions recursively through the hierarchy of smart contracts.

ABI JSON Format:

Acceptable format (array of objects):

[
    {
        "address": address1, // address of smart contract
        "abi": abi1, // ABI of smart contract
        "alias": alias // Name of smart contract, optional
    },
    {
        "address": address2,
        "abi": abi2
    },
    ...
]
    

Output:

Transaction information is saved in CSV format. Columns:

• address — address of the smart contract (receiving party of the transaction)
• caller — the sending party of the transaction
• timeStamp — timestamp when the transaction was mined
• blockNumber — number of block in which the transaction was recorded
• gasUsed — the exact units of gas that was used for the transaction
• gasPrice — cost per unit of gas specified for the transaction
• gas — maximum amount of gas provided for the transaction
• alias — alias of the smart contract
• itxs — internal transactions (traces) related to the transaction
• input — encoded input data
• method — method called in the transaction
• parameters — transaction method parameters decoded with ABI of smart contract
• features — parameters' features

CSV file name has format:

<contract alias>_<startblock>_<endblock>_<batch number>.csv

• contract alias — smart contract alias, if the alias was not found, it will be "unidentified"
• startblock — block number on which the search was started
• endblock — block number on which the search was ended
• batch number — all smart contract transactions are divided into batches of 1000 transactions

Example:

In terminal run:

gaster 0xF324A8f3e0DbeD9059e5acBfC6C53a31A82b6AfB -s 7713731 -e 7713749 --net ropsten -r

The output should be:

Gaster_7713731_7713749_0.csv

address	caller	timeStamp	blockNumber	gasUsed	gasPrice	gas	alias	itxs	input	method	properties	features
0xf324a8f3e0dbed9059e5acbfc6c53a31a82b6afb	0x4ca389faad549add7124f2b215266ce162d964e7	1586839485	7713731	557513	100000	557513	Gaster	[]	0x60806...10032	Contract creation Gaster	{}	[]
0xf324a8f3e0dbed9059e5acbfc6c53a31a82b6afb	0x4ca389faad549add7124f2b215266ce162d964e7	1586839616	7713738	245028	100000	245028	Gaster	[{""from"":""0xf324a8f3e0dbed9059e5acbfc6c53a31a82b6afb"",""to"":"""",""contractAddress"":""0x43c685a1a11b8310a21b876d6c7099db62b4dcc9"",""type"":""create"",""input"":"""",""timeStamp"":""1586839616""}]	0xfebb0f7e	bar	{}	[]
0xf324a8f3e0dbed9059e5acbfc6c53a31a82b6afb	0x4ca389faad549add7124f2b215266ce162d964e7	1586839708	7713744	64262	100000	64262	Gaster	[]	0xc5d1c9...00000	foo	{""term"":""a"",""_store"":""hello""}	[{""name"":""_store"",""type"":""length"",""value"":5}]
0xf324a8f3e0dbed9059e5acbfc6c53a31a82b6afb	0x4ca389faad549add7124f2b215266ce162d964e7	1586839797	7713747	67628	100000	68260	Gaster	[{""from"":""0xf324a8f3e0dbed9059e5acbfc6c53a31a82b6afb"",""to"":""0x43c685a1a11b8310a21b876d6c7099db62b4dcc9"",""contractAddress"":"""",""type"":""call"",""input"":"""",""timeStamp"":""1586839797""}]	0xf32ca...00000	qux	{""term"":""64"",""_store"":""hi""}	[{""name"":""_store"",""type"":""length"",""value"":2}]

Chaster_7713731_7713749_0.csv

address	caller	timeStamp	blockNumber	gasUsed	gasPrice	gas	alias	itxs	input	method	properties	features
0x43c685a1a11b8310a21b876d6c7099db62b4dcc9	0x4ca389faad549add7124f2b215266ce162d964e7	1586839833	7713749	35107	100000	36507	Chaster	[]	0xc5d1c9...00000	foo	{""term"":""3e8"",""_store"":""hey""}	[{""name"":""_store"",""type"":""length"",""value"":3}]

Library

Example:

const { getGasStats } = require('gaster');
 
const main = async () => {
      const address = '0xF324A8f3e0DbeD9059e5acBfC6C53a31A82b6AfB';
      const options = {
        net: NetworkName.ROPSTEN,
        recursive: true
      };
      const result = await getGasStats(address, options);
      return result;
}

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

License

Gaster is available under the MIT license. See the LICENSE file for more info.