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In the TestSetMessage function, we use this contract pointer to update the message data property of the Inbox contract by calling the SetMessage function. Since the SetMessage function modifies the Inbox contract, it actually generates a new transaction. As a result, we pass in a pointer to a TrasactOpts struct populated with the transaction authorization data.
Since we dont need to send any funds along with the SetMessage invocation, we set the Value property of the TransactOpts struct to nil. Once our local tests are passing, our Inbox contract is ready for prime time. In the next section we will take a look at how we can take our Inbox contract and deploy it on a public Ethereum network.
We will be deploying the Inbox contract on the Rinkeby Test Ethereum public network. Deploying and interacting with Ethereum contracts on the Main Ethereum network costs actual money and not necessary when we are just learning or playing around. To deploy and interact with an Ethereum contract on a public network such as Rinkeby , a couple of things need to be in place:.
We can create and manage accounts directly from the geth cli we built earlier. However, when starting out, I found it much simpler to use the in browser Metamask Chrome extension. It is quite simple to install Metamask and create an account. I will leave this as an exercise for the reader. Once we are up and running with Metamask and have an account created, we want to make sure that we point Metamask to the Rinkeby Test network. However, to request ether from this test faucet, we first need to make a post containing just our Ethereum account address this is account we want to transfer funds into.
We can copy this address by clicking on the ellipses right next to the account name on the Metamask extension on a social networking site and provide a link to the post to the faucet. It will take a few seconds and we should see the funds show up in our account in the Metamask extension. We can use geth to spin up and manage our own Ethereum node on the Rinkeby test network.
This is both resource and time intensive and not always a smooth process. A better alternative is to connect to a running Ethereum node hosted by a third party provider. One such provider is Infura. We can sign-up for a free account with Infura. In order to deploy and interact contracts on a public Ethereum network such as Rinkeby via Go-Ethereum, we need an encrypted json key for the account we created through Metamask above.
This is the account we want to be charged for deploying and interacting with the Inbox contract. We can generate this JSON key by exporting the private key click on the ellipses right next to the account name in metamask to get to the export private key option for our account in Metamask to a file and then importing it via geth.
Make sure you delete the private key file after you have done the import. Take note of this file. We will use its contents in the next section as we deploy and interact with the Inbox contract on the Rinkeby test network. We have finally made it to the point where we are ready to deploy the Inbox contract to the Rinkeby network.
Lets first look at the code that goes into the deploy. We use the ethclient. Dial method with Infura url we generated earlier to connect to an Ethereum node on the Rinkeby test network. We then use the bind.
NewTransactor utility method to create an authorized transactor from the contents of the key file you can use geth account list command to retrieve the location of your JSON key file on your system and its associated password we generated above via geth account import. From there on, the code to deploy the contract is exactly the same as we have seen when deploying the Inbox contract using the simulated blockchain. Finally, if all goes well, we print the the address at which the Inbox contract is deployed on the network.
It will take a few minutes for this contract to be mined and be part of the blockchain. We can use the address of the deployed Inbox contract to begin interacting with it once it has been mined and included in the blockchain. For example, we can put the code below in the fetch. As seen before, we use the ethclient. We then use the NewInbox method generated as part of the Go bindings for the Solidity contract to attach an instance of the Inbox contract to an Inbox contract deployed at a specific address.
Finally we access the Message property on the contract which should print Hello World. We can also update the Message property on the deployed Inbox contract. To do so, place the code below in the update. Recall that the SetMessage function modifies the Inbox contract and actually generates a new transaction.
Again, It will take a few minutes for this transaction to be mined and be part of the blockchain. Once it is mined and included in the blockchain, we can follow the earlier example of retrieving the Message property from the deployed contract to see the updated value. There is a lot we can do with Go Ethereum but just getting started could be a bit over whelming. Hopefully this post has given you a starting point from where you could explore further.
Signup or Login to Join the Discussion. Interview Decentralized Interview. Smart Contracts in Go is an easy to follow step by step guide in the hopes of helping others get productive with Go and. The guide will be most useful to you if you are familiar with the Go programming language and have a Go workspace already setup. We will write and deploy a simple Inbox contract to interact with an.
Ethereum smart contract on a public network. The contract is pretty straight forward and has one data variable called message. It holds the contents of the most recent message. See the issues for topics that need to be covered or updated. Skip to content. Ethereum Smart Contract Best Practices.
General Philosophy. Development Recommendations. Security Tools. Where to start?
Solidity is a statically typed, contract-oriented, high-level language for implementing smart contracts on the Ethereum platform. A repo for boilerplate code for testing, deploying, and shipping chainlink solidity code. Working with smart contracts with eth-brownie, python, and Chainlink. Welcome to the repository for the Ultimate Solidity, Blockchain, and Smart Contract - Beginner to Expert Full Course | Python Edition FreeCodeCamp course!