flow-run v1.0.6

flow-run

A tool to simplify and extend flow-cli usage.

Initial motivation
Usage
How it works
Extra stuff
Commands reference

Initial motivation

When dealing with Flow Blockchain transactions and scripts, we use the flow-cli to make the execution on the environments.
For example:

flow transactions send ./cadence/transactions/SomeTransaction.cdc "arg1" "arg2" --signer emulator-account

flow scripts execute ./cadence/scripts/SomeScript.cdc "arg1" "arg2"

The problem starts because usually the transactions and scripts files have some imports:

import FungibleToken from 0xee82856bf20e2aa6
import DemoToken from 0xf8d6e0586b0a20c7

pub fun main(account: Address): UFix64 {
    let acct = getAccount(account)

    let vaultRef = acct.getCapability(DemoToken.BalancePublicPath)
        .borrow<&DemoToken.Vault{FungibleToken.Balance}>()
        ?? panic("Could not borrow Balance reference to the Vault")

    return vaultRef.balance
}

But the addres for these imports changes from one environment to other.

So, to execute the scripts sometimes on the application, sometimes using flow-cli, and also, using the flow-cli doing the execution in different environments (emulator, testnet, mainnet), we have to change the import addresses all the time.

This is so time consuming and frustating! So the initial motivation is to handle the import addresses gracefully when executing the scripts and transactions on the command line.

Usage

The most common way is to install the tool globally using npm:

npm install flow-run -g

The tool basically keep the same structure of the flow-cli commands! (There's one exception, for the "flow accounts create" command. See below).

So if you want to execute this transaction:

flow transactions send ./cadence/transactions/SomeTransaction.cdc "arg1" "arg2" --signer emulator-account

You just need to change "flow" by "flow-run":

flow-run transactions send ./cadence/transactions/SomeTransaction.cdc "arg1" "arg2" --signer emulator-account

The same for scripts. This:

flow scripts execute ./cadence/scripts/SomeScript.cdc "arg1" "arg2"

Would become:

flow-run scripts execute ./cadence/scripts/SomeScript.cdc "arg1" "arg2"

flow accounts create command

Due to issues with the flow-cli "flow accounts create" command, we changed a little bit the behavior, for convenience.
We added the argument "--name" to the command, so you will be able to inform on the command line the name of the account you're creating.

On the flow-cli command, you only have the chance to inform the account's name on the interative version of the command:

flow accounts create
v Enter an account name: Alice█

But using flow-run command, you will be able to send the name:

flow-run accounts create --name Alice

This command will generate a public and private keys, create the account on the blockchain and update the flow.json "accounts" section with the "Alice" account.

Important: If there's already an account named "Alice" in your flow.json, it will be updated to the new account created.

How it works

The tools respects the flow.json configuration file of your project, replacing the imports you have in your files by some generated imports built dinamically accordingly to the specified network, looking to the "contracts/aliases" configuration of the flow.json file.

For example, given this flow.json "contracts" section:

"contracts": {
    "DemoToken": {
      "source": "./cadence/contracts/DemoToken.cdc",
      "aliases": {
        "emulator": "0xf8d6e0586b0a20c7",
        "testnet": "0x03c4ce9102e879bb"
      }
    },

    "FungibleToken": {
      "source": "./cadence/contracts/FungibleToken.cdc",
      "aliases": {
        "emulator": "0xee82856bf20e2aa6",
        "testnet": "0x9a0766d93b6608b7"
      }
    }
}

And given the following script file named "SomeScript.cdc":

import FungibleToken from "./FungibleToken.cdc"
import DemoToken from "./DemoToken.cdc"

pub fun main(account: Address): UFix64 {
    let acct = getAccount(account)

    let vaultRef = acct.getCapability(DemoToken.BalancePublicPath)
        .borrow<&DemoToken.Vault{FungibleToken.Balance}>()
        ?? panic("Could not borrow Balance reference to the Vault")

    return vaultRef.balance
}

Running this command:

flow-run scripts execute ./cadence/scripts/SomeScript.cdc --network emulator

Will dinamically generate (and execute) a script like this:

import FungibleToken from 0xee82856bf20e2aa6
import DemoToken from 0xf8d6e0586b0a20c7

pub fun main(account: Address): UFix64 {
    let acct = getAccount(account)

    let vaultRef = acct.getCapability(DemoToken.BalancePublicPath)
        .borrow<&DemoToken.Vault{FungibleToken.Balance}>()
        ?? panic("Could not borrow Balance reference to the Vault")

    return vaultRef.balance
}

Otherwise, running this command:

flow-run scripts execute ./cadence/scripts/SomeScript.cdc --network testnet

Will dinamically generate (and execute) a script like this:

import FungibleToken from 0x9a0766d93b6608b7
import DemoToken from 0x03c4ce9102e879bb

pub fun main(account: Address): UFix64 {
    let acct = getAccount(account)

    let vaultRef = acct.getCapability(DemoToken.BalancePublicPath)
        .borrow<&DemoToken.Vault{FungibleToken.Balance}>()
        ?? panic("Could not borrow Balance reference to the Vault")

    return vaultRef.balance
}

Important! The tool makes a local temporary copy of your transactions and scripts files, never changing the original files.

Extra stuff

Additionally, the tools have other convenience commands, other than the flow-cli "replacements":

Read smart contract public variable

The command "read" allows access to the value of any public variable. For example, this command:

flow-run read FlowToken totalSupply UFix64 --network testnet

Will display the value of the variable "totalSupply" of the smart contract "FlowToken" deployed on the testnet, without the need of a script to be created.

Commands reference

Global arguments (Can be passed to any command)

--network or -n : The network to execute the command. Must exists on flow.json configuration file. Default: "emulator"
--placeholders or -p : Javascript object with placeholders to be used on scripts and transactions. Example: { Placeholder1: 'DemoToken' }
--debug or -d: Execute the command in Debug mode. Basically do not delete the temporary script/transaction generated by the tool. Default: false

"transactions send" command

flow-run transactions send ./cadence/transactions/SomeTransaction.cdc "arg1" "arg2" --signer emulator-account

"transactions send" command with placeholders

flow-run transactions send ./cadence/transactions/SomeTransaction.cdc "arg1" "arg2" --signer emulator-account --placeholders "{ Placeholder1: 'DemoToken' }"

"scripts execute" command

flow-run scripts execute ./cadence/scripts/SomeScript.cdc "arg1" "arg2"

"accounts create" command

flow-run accounts create --name Alice

"read" command

flow-run read FlowToken totalSupply UFix64