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Deploy contract using Truffle (on testnet)

This article takes Pet-Shop as an example to introduce how to deploy smart contract into smartBCH testnet using truffle.

Build smartbchd and generate a test key

Please flow this document to clone and build smartbchd. We need a test account and associated private key, smartbchd provides a sub-command to generate them for us:

$ cd path/to/your/smartbch/dir # and build smartbchd following the given doc
$ ./smartbchd gen-test-keys -n 1 --show-address

The output looks like this (the generated private key and address are seperated by a space):

09c57df30208bdc056144c32d607f0719bdb0f8ac5f0a3259720d9e4d28d999b 0xab83b691Bc12Aae947B2ca240F1732fa792dE246

Go to smartBCH testnet faucet to fund our newly generated address some BCH.

Install Truffle

We need to install Node.js first, here are detailed information about how to install it on various platforms. Then, run the following cmd to install truffle:

$ npm install -g truffle

And run the following cmd the see if truffle was installed successfully:

$ truffle version

Truffle v5.1.63 (core: 5.1.63)
Solidity v0.5.16 (solc-js)
Node v15.10.0
Web3.js v1.2.9

Clone Pet-Shop and add testnet config

Using git clone cmd to clone pet-shop source code into you local directory:

$ cd somedir
$ git clone https://github.com/trufflesuite/pet-shop-tutorial.git
$ cd pet-shop-tutorial

Install truffle hdwallet-provider v1.2.6 (for some unknown reason, the latest version v1.3.x may not work with private keys, so we use v1.2.x here):

$ npm install @truffle/[email protected] --save-dev

Modify truffle-config.js, add smartBCH testnet network configuration using you test key like bellow (you can find more smartBCH testnet RPC URLs here):

const HDWalletProvider = require('@truffle/hdwallet-provider');

module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // for more about customizing your Truffle configuration!
  networks: {
    development: {
      host: "127.0.0.1",
      port: 7545,
      network_id: "*" // Match any network id
    },
    sbch_testnet: {
      network_id: "10001",
      gasPrice: 0,
      provider: () => new HDWalletProvider({
        providerOrUrl: "http://35.220.203.194:8545",
        privateKeys: [
          "09c57df30208bdc056144c32d607f0719bdb0f8ac5f0a3259720d9e4d28d999b",
        ],
      }),
    }
  }
};

Deploy Pet-Shop to smartBCH testnet

In directory pet-shop-tutorial, using truffle migrate cmd to deploy Pet-Shop contract into smartBCH testnet:

$ truffle migrate --network sbch_testnet

The output looks like this:

Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.



Starting migrations...
======================
> Network name:    'sbch_testnet'
> Network id:      10001
> Block gas limit: 200000000 (0xbebc200)


1_initial_migration.js
======================

   Deploying 'Migrations'
   ----------------------
   > transaction hash:    0xd03a612ec8ff3800fdaba8eab70230575cf5b6ed9c1eeecfa5595b20d7553281
   > Blocks: 1            Seconds: 8
   > contract address:    0x12033fAFdd217E1fF8F247D9C6E9a0606f75c813
   > block number:        71514
   > block timestamp:     1619962004
   > account:             0xab83b691Bc12Aae947B2ca240F1732fa792dE246
   > balance:             0.01
   > gas used:            225225 (0x36fc9)
   > gas price:           0 gwei
   > value sent:          0 ETH
   > total cost:          0 ETH


   > Saving migration to chain.
   > Saving artifacts
   -------------------------------------
   > Total cost:                   0 ETH


2_deploy_contracts.js
=====================

   Deploying 'Adoption'
   --------------------
   > transaction hash:    0xc5137d30a6b065bfac3b6a3b8a321ffc338366c110e56315f9e601bca56e344b
   > Blocks: 2            Seconds: 8
   > contract address:    0x7D268085bDa90c0F9bC1c16c5bE6632958470B89
   > block number:        71518
   > block timestamp:     1619962024
   > account:             0xab83b691Bc12Aae947B2ca240F1732fa792dE246
   > balance:             0.01
   > gas used:            203827 (0x31c33)
   > gas price:           0 gwei
   > value sent:          0 ETH
   > total cost:          0 ETH


   > Saving migration to chain.
   > Saving artifacts
   -------------------------------------
   > Total cost:                   0 ETH


Summary
=======
> Total deployments:   2
> Final cost:          0 ETH

Wow! You have deployed Pet-Shop into smartBCH testnet. Thank you for testing smartBCH testnet 😊