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| # Contract interaction | ||
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| The [zksync-cli](../README.md) tool, now enhanced with `contract read` and `contract write` commands, offers efficient ways for developers to interact with smart contracts on zkSync. These commands automate tasks such as method verification, ABI handling, output decoding, and proxy contract processing. | ||
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| ### Table of contents | ||
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| - [Contract Read - Running read-only methods](#contract-read) | ||
| - [Contract Write - Executing write operations](#contract-write) | ||
| - [Examples](#examples) | ||
| - [Basic read example](#basic-read-example) | ||
| - [Basic write example](#basic-write-example) | ||
| - [Using local ABI file](#using-local-abi-file) | ||
| - [Running read on behalf of another address](#running-read-on-behalf-of-another-address) | ||
| - [Write operation with value transfer](#write-operation-with-value-transfer) | ||
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| <br /> | ||
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| --- | ||
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| <br /> | ||
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| ## Contract Read | ||
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| The `npx zksync-cli contract read` command executes read-only methods on contracts, like checking ERC-20 balances or contract states. [See basic example](#basic-read-example) | ||
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| ### Read Options | ||
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| You do not need to specify options bellow, you will be prompted to enter them if they are not specified. | ||
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| - `--chain <chain-name>`: Select the chain to use | ||
| - `--rpc <url>`: Provide RPC URL instead of selecting a chain | ||
| - `--contract <address>`: Specify contract's address | ||
| - `--method <method-signature>`: Defines the contract method to interact with | ||
| - `--arguments <method-arguments...>`: Pass arguments to the contract method | ||
| - `--data <0x-transaction-data>`: Instead of specifying the method and arguments, you can pass the raw transaction data | ||
| - `--outputTypes <output-types...>`: Specifies output types for decoding | ||
| - `--from <address>`: Call method on behalf of specified address | ||
| - `--abi <path>`: Path to local ABI file or contract artifact | ||
| - `--decode-skip`: Skips prompting for output types and decoding the response | ||
| - `--show-info`: Displays transaction request information (e.g. encoded transaction data) | ||
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| <br /> | ||
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| --- | ||
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| <br /> | ||
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| ## Contract Write | ||
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| The `npx zksync-cli contract write` command performs write operations on smart contracts. It enables sending transactions that alter the state of a contract, such as transferring tokens or changing ownership. [See basic example](#basic-write-example) | ||
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| ### Write Options | ||
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| You do not need to specify options bellow, you will be prompted to enter them if they are not specified. | ||
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| - `--chain <chain-name>`: Select the chain to use | ||
| - `--rpc <url>`: Provide RPC URL instead of selecting a chain | ||
| - `--contract <address>`: Specify contract's address | ||
| - `--method <method-signature>`: Defines the contract method to interact with | ||
| - `--arguments <method-arguments...>`: Pass arguments to the contract method | ||
| - `--value <ether-amount>`: Ether amount to send with the transaction (e.g. 0.01) | ||
| - `--private-key <wallet-private-key>`: Private key of the wallet to use to sign the transaction | ||
| - `--data <0x-transaction-data>`: Instead of specifying the method and arguments, you can pass the raw transaction data | ||
| - `--abi <path>`: Path to local ABI file or contract artifact | ||
| - `--show-info`: Displays transaction request information (e.g. encoded transaction data) | ||
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| <br /> | ||
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| --- | ||
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| <br /> | ||
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| ## Examples | ||
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| #### Basic read example | ||
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| ```bash | ||
| npx zksync-cli contract read | ||
| ``` | ||
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| You will be prompted to select a chain, contract address, and method. | ||
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| ```bash | ||
| ? Chain to use: zkSync Goerli Testnet | ||
| ? Contract address: 0x3e7676937A7E96CFB7616f255b9AD9FF47363D4b | ||
| ``` | ||
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| Next you need to select a **method (function) to call**. | ||
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| - In case your contract is verified it will automatically identify the ABI: | ||
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| ```bash | ||
| ? Contract method to call | ||
| ────────── Provided contract ────────── | ||
| ❯ balanceOf(address account) view returns (uint256) | ||
| decimals() pure returns (uint8) | ||
| name() pure returns (string) | ||
| symbol() pure returns (string) | ||
| totalSupply() view returns (uint256) | ||
| ─────────────────────────────────────── | ||
| Type method manually | ||
| ``` | ||
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| - Otherwise you'll have to enter method signature manually, for example `balanceOf(address)`. | ||
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| ```bash | ||
| ? Enter method to call: balanceOf(address) | ||
| ``` | ||
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| - Alternatively, you can specify the ABI file manually using the `--abi` option. [See example](#using-local-abi-file) | ||
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| After that, you will be prompted to enter **arguments** for the method, one by one. | ||
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| ```bash | ||
| ? Provide method arguments: | ||
| ? [1/1] account (address): 0xa1cf087DB965Ab02Fb3CFaCe1f5c63935815f044 | ||
| ``` | ||
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| When submitted a contract call will be made and you'll see the response in it's original encoded form. | ||
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| ```bash | ||
| ✔ Method response (raw): 0x000000000000000000000000000000000000000000010508e606548a9e5d2000 | ||
| ``` | ||
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| Finally, you will be asked the **method output** type to decode the response. You can skip this step by submitting empty response or completely skip it by passing `--decode-skip` option. | ||
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| ```bash | ||
| ? Output types: uint256 | ||
| ✔ Decoded method response: 1232701801010000000000000 | ||
| ``` | ||
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| **Tip**: after running command with prompts you will see a full command with all the options that you can copy and use later to quickly run the same command again. For example: | ||
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| ```bash | ||
| npx zksync-cli contract read \ | ||
| --chain "zksync-goerli" \ | ||
| --contract "0x3e7676937A7E96CFB7616f255b9AD9FF47363D4b" \ | ||
| --method "balanceOf(address)" \ | ||
| --args "0xa1cf087DB965Ab02Fb3CFaCe1f5c63935815f044" \ | ||
| --output "uint256" | ||
| ``` | ||
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| <br /> | ||
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| --- | ||
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| <br /> | ||
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| #### Basic write example | ||
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| ```bash | ||
| npx zksync-cli contract write | ||
| ``` | ||
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| You will be prompted to select a chain, contract address, and method. | ||
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| ```bash | ||
| ? Chain to use: zkSync Goerli Testnet | ||
| ? Contract address: 0x3e7676937A7E96CFB7616f255b9AD9FF47363D4b | ||
| ``` | ||
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| Next you need to select a **method (function) to call**. | ||
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| - In case your contract is verified it will automatically identify the ABI: | ||
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| ```bash | ||
| ? Contract method to call | ||
| ────────── Provided contract ────────── | ||
| ❯ approve(address spender, uint256 amount) returns (bool) | ||
| transfer(address to, uint256 amount) returns (bool) | ||
| ─────────────────────────────────────── | ||
| Type method manually | ||
| ``` | ||
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| - Otherwise you'll have to enter method signature manually, for example `transfer(address,uint256)`. | ||
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| ```bash | ||
| ? Enter method to call: transfer(address,uint256) | ||
| ``` | ||
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| - Alternatively, you can specify the ABI file manually using the `--abi` option. [See example](#using-local-abi-file) | ||
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| After that, you will be prompted to enter **arguments** for the method, one by one. | ||
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| ```bash | ||
| ? Provide method arguments: | ||
| ? [1/2] to (address): 0xa1cf087DB965Ab02Fb3CFaCe1f5c63935815f044 | ||
| ? [2/2] amount (uint256): 1 | ||
| ``` | ||
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| Now you need to provide private key of the wallet to use to sign the transaction. | ||
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| ```bash | ||
| ? Private key of the wallet to sign transaction: ***** | ||
| ``` | ||
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| When submitted a contract call will be made and you'll see the transaction hash | ||
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| ```bash | ||
| ✔ Transaction submitted. Transaction hash: 0xa83ad7e8932e18cdc57d3892040505a50d560a56fa507cabcd4180e9e5898bec | ||
| ``` | ||
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| **Tip**: after running command with prompts you will see a full command with all the options that you can copy and use later to quickly run the same command again. For example: | ||
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| ```bash | ||
| npx zksync-cli contract write \ | ||
| --chain "zksync-goerli" \ | ||
| --contract "0x3e7676937A7E96CFB7616f255b9AD9FF47363D4b" \ | ||
| --method "transfer(address to, uint256 amount)" \ | ||
| --args "0x3e7676937A7E96CFB7616f255b9AD9FF47363D4b" "1" | ||
| ``` | ||
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| <br /> | ||
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| --- | ||
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| <br /> | ||
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| ### Using local ABI file | ||
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| You can specify a local ABI file using the `--abi` option. It should be a JSON file with either ABI data (array) or contract artifact which you get after compiling your contracts. | ||
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| ```bash | ||
| npx zksync-cli contract read \ | ||
| --abi "./Greeter.json" | ||
| ``` | ||
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| Now you will be able to select a method: | ||
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| ```bash | ||
| ────────── Provided contract ────────── | ||
| ❯ greet() view returns (string) | ||
| ─────────────────────────────────────── | ||
| Type method manually | ||
| ``` | ||
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| Response will be decoded automatically as well according to the ABI file. | ||
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| <br /> | ||
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| --- | ||
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| <br /> | ||
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| ### Running read on behalf of another address | ||
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| You can specify the `--from` option to run the method on behalf of another address. This is useful when you need to call a method that expects a specific address as `msg.sender`. | ||
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| ```bash | ||
| npx zksync-cli contract read \ | ||
| --from "0xa1cf087DB965Ab02Fb3CFaCe1f5c63935815f044" | ||
| ``` | ||
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| <br /> | ||
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| --- | ||
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| <br /> | ||
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| ### Write operation with value transfer | ||
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| Here, the command sends a transaction that includes Ether transfer along with the method call. | ||
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| ```bash | ||
| npx zksync-cli contract write \ | ||
| --value "0.1" | ||
| ``` |