evmos-smart-contract

Evmos Smart Contract simple cli

This is a cli tool to deploy a smart contract to evmos chain plus a querying methods and sending transactions to a contract.

Install

git clone https://github.com/mojtaba-esk/evmos-smart-contract.git
cd evmos-smart-contract
make install

to checkout if the tool is ready to use, run this command:

evmos-smart-contract --help

you should see the help info:

Deploy and manage a smart contract on evmos

Usage:
  evmos-smart-contract [command]

Available Commands:
  balance     Query the balance of a contract
  completion  Generate the autocompletion script for the specified shell
  deploy      Deploy a contract to the evmos chain
  help        Help about any command
  keys        Manage your applications keys
  query       Query a contract to the evmos chain
  transfer    Transfer a contract tokens to an address
  tx          Call a method of a contract that modifies the state

Flags:
      --algo string                      The algorithm used to generate the keys (default "eth_secp256k1")
      --chain-id string                  The evmos chain id (default "evmos_9000-1")
      --compiled-contracts-path string   The path to the compiled contracts in json format (default "/home/moji/mojimos/evmos-smart-contract/contracts/compiled_contracts")
  -h, --help                             help for evmos-smart-contract
      --keyring-backend string           Keyring backend to use, default value is: os (default "os")
      --keyring-dir string               Keyring backend directory (default "/home/moji/.evmosd")
      --node string                      The evmos node to connect to (default "http://localhost:8545")
      --output string                    Output format (text|json) (default "text")

Use "evmos-smart-contract [command] --help" for more information about a command.

Running a local evmos node

First you need to get the evmos daemon binary.

git clone https://github.com/evmos/evmos.git
cd evmos
make install

If you face some errors make sure you have the prerequisites installed and configured properly. Checkout the evmos repo

Check if evmosd is ready to use:

evmosd version

Then we go to the cli directory and initialize the local testnet

cd evmos-smart-contract
./init.sh

it will create an account and fills it up with funds and starts a local evmos testnet.

Commands

List the available accounts:

evmos-smart-contract keys list --keyring-backend test

since we are using a test environment, we use --keyring-backend test in all commands.

Deploy a smart contract

The simplest way to deploy a smart contract is to put the solidity files inside contracts directory and run the following commands.

First we make sure we have all the required tools installed on our machine by running this command:

make contract-tools

After having the contract tools installed, let's compile all the contracts:

make contracts-compile

Now we can deploy the smart contract that we want. Here is the usage:

evmos-smart-contract deploy [contract_name] [init_params_json] [flags]

Let's deploy the HelloWorld contract:

evmos-smart-contract deploy HelloWorld '{"params":["Ciao Gholi"]}' --from mykey --keyring-backend test

where

• HelloWorld is the name of the contract
• '{"params":["Ciao Gholi"]}' is the initial parameter(s) that the constructor of the contract receives in json format. Note: It only supports basic types including numbers and strings.
• mykey is the name of our key that the init.sh script has created for us and is funded

The output of this command is a contract address and a TX hash.

Contract Address:  0x4c97c555477A96D4FA14d6F2B39ea1F6cDA5082a
TX Hash:  0x8cfb8907f6f715dc79ba7841567766b5a64505304d665628e873f1c94685f205

This command has a number of flags to make it more customized if we need:

--algo string : The algorithm used to generate the keys (default "eth_secp256k1")
--chain-id string : The evmos chain id (default "evmos_9000-1")
--compiled-contracts-path string : The path to the compiled contracts in json format (default "~/evmos-smart-contract/contracts/compiled_contracts")
--keyring-backend string : Keyring backend to use, default value is: os (default "os")
--keyring-dir string : Keyring backend directory (default "/home/moji/.evmosd")
--node string  : The evmos node to connect to (default "http://localhost:8545")

Query a smart contract

The query command calls a method of a contract which only reads the state. i.e. does not change the state.

Here is the usage:

evmos-smart-contract query [contract_name] [contract_address] [method_to_call] [method_params_json] [flags]

Let's read the message value from the HelloWorld contract.

evmos-smart-contract query HelloWorld 0x4c97c555477A96D4FA14d6F2B39ea1F6cDA5082a message

where

• HelloWorld is the name of the contract
• 0x4c97c555477A96D4FA14d6F2B39ea1F6cDA5082a is the contract address
• message is the name of the method to call

Here is the example output:

output: [Ciao Gholi]

If we need to pass some parameters, in basic types, we can write it in json format after the name of the contract.

Send a custom transaction to a contract

With tx command we can call a method of a contract that modifies the state. Here is the usage:

evmos-smart-contract tx [contract_name] [contract_address] [method_to_call] [method_params_json] [flags]

Let's update the HelloWrold message:

evmos-smart-contract tx HelloWorld 0x4c97c555477A96D4FA14d6F2B39ea1F6cDA5082a update '{"params":["Ciao bello"]}' --from mykey --keyring-backend test

The output is some information about the transaction:

TX Hash:  0xa55aea8053c1eb3e33fa362a812d4949bc2da2ced7af47c8be506347cfb6b10b
{
  "type": "0x0",
  "nonce": "0x3",
  "gasPrice": "0xf4240",
  "maxPriorityFeePerGas": null,
  "maxFeePerGas": null,
  "gas": "0x2dc6c0",
  "value": "0x0",
  "input": "0x3d7403a30000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000a4369616f2062656c6c6f00000000000000000000000000000000000000000000",
  "v": "0x4674",
  "r": "0x7eb3bc59b355124bb7fc1db706537517110afaed29ed471c254b1406e0336019",
  "s": "0xbd8f130b58ed6654112d57d3fda5d7243c11ed93edaa95858b7771212dcfb59",
  "to": "0x4c97c555477a96d4fa14d6f2b39ea1f6cda5082a",
  "hash": "0xa55aea8053c1eb3e33fa362a812d4949bc2da2ced7af47c8be506347cfb6b10b"
}

Now we can query the message again to see if the update is reflected properly:

evmos-smart-contract query HelloWorld 0x4c97c555477A96D4FA14d6F2B39ea1F6cDA5082a message

output: [Ciao bello]

Transfer transfer token balances on the deployed smart contract

To run this command we need a smart contract with ERC20 standard. Let's deploy one.

evmos-smart-contract deploy MyTestToken --from mykey --keyring-backend test

Contract Address:  0xe97faB40A966BF149B0926008AbA2aB854b16A1d
TX Hash:  0x654d2b28e3bfe9a84bb781e3d86099247c49976eeb3e402d36f52e1a493db03c

Here is the usage of the transfer command:

evmos-smart-contract transfer [contract_name] [contract_address] [to_address] [amount] [flags]

Let's transfer some tokens:

evmos-smart-contract transfer MyTestToken 0xe97faB40A966BF149B0926008AbA2aB854b16A1d e0x25f59737df93dc4e1a6e55c86e87d898e8f760c1 10 --from mykey --keyring-backend test

where

• MyTestToken is the name of the contract
• 0xe97faB40A966BF149B0926008AbA2aB854b16A1d is the contract address
• e0x25f59737df93dc4e1a6e55c86e87d898e8f760c1 is the receiver account
• 10 is the amount to transfer
• mykey is the sender account

Here is the output:

TX Hash:  0x79b17dfc8465bc092f7f4132b84e58eaed62ecab94026077e3f76f63ddb57370
{
  "type": "0x0",
  "nonce": "0x5",
  "gasPrice": "0xf4240",
  "maxPriorityFeePerGas": null,
  "maxFeePerGas": null,
  "gas": "0x2dc6c0",
  "value": "0x0",
  "input": "0xa9059cbb000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000a",
  "v": "0x4673",
  "r": "0x364037b33b24b70dbec42b3291f96395a2797e70629cca8a88cb05a0d3a14534",
  "s": "0x75415693024db69df881beef0968458c2806fa84842599147e76fa4c2e1fcf50",
  "to": "0xe97fab40a966bf149b0926008aba2ab854b16a1d",
  "hash": "0x79b17dfc8465bc092f7f4132b84e58eaed62ecab94026077e3f76f63ddb57370"
}

Query the token balances on the deployed smart contract

Here is the command usage:

evmos-smart-contract balance [contract_name] [contract_address] [account_address] [flags]

Let's check the balance of the account that we just did the transfer to:

evmos-smart-contract  balance MyTestToken 0xe97faB40A966BF149B0926008AbA2aB854b16A1d e0x25f59737df93dc4e1a6e55c86e87d898e8f760c1

Amount: 10.000000000000000000
Denom: MTT

Test

To run integration test use the following command:

make integration-test

It runs a local evmos node itself and performs the tests.

Code docs

https://pkg.go.dev/github.com/mojtaba-esk/evmos-smart-contract