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Running The Project
Under the app layer folder you will see each of the smart contracts that will be presented in the training. Each of these smart contract projects contain two layers
- cmd: This is where Go programs are located to build and experiment with the smart contract API.
- contract: This is where the Solidity smart contract is located and any build artifacts.
Ethereum is configured to run in a developer mode that will allow for the deployment and execution of smart contracts. Use the following make command to start the Ethereum service. Make sure you start Ethereum in a dedicated terminal session.
$ make geth-up
To stop the Ethereum service, use the down command.
$ make geth-down
The smart contract can be found in app/basic/contract/src/store/store.sol and is a smart contract written in the Ethereum programming language called Solidity. It will be helpful to install the Solidity extension by Juan Blanco. To compile and build the smart contract, run the following make command.
$ make basic-build
That will produce an abi, bin, and go file inside the app/basic/contracts/store directory. Any time code for the smart contract is changed, it must be built again for the Go applications.
With the Ethereum service up and running, run the following make command to deploy the smart contract.
$ make basic-deploy
If this is successful, the following output should be similar to.
go run app/basic/cmd/deploy/main.go
fromAddress: 0x6327A38415C53FFb36c11db55Ea74cc9cB4976Fd
Transaction Details
----------------------------------------------------
tx sent : 0xafc894991575d94d1cbc004784e6d6bd4201e56fedfbe417e250f2b0a9c624ef
tx gas offer price : 0.431556798 GWei
tx gas limit : 300000
tx value : 0.0 GWei
tx max price : 129467.39400000 GWei (Gas Offer Price * Max Gas Allowed)
tx max price : 0.33014085 USD
Contract Details
----------------------------------------------------
contract id : 0x531130464929826c57BBBF989e44085a02eeB120
export CONTRACT_ID=0x531130464929826c57BBBF989e44085a02eeB120
Waiting Logs
----------------------------------------------------
t=2022-09-07T15:58:09-0400 lvl=trce msg="Handled RPC response" reqid=2 duration=417ns
Receipt Details
----------------------------------------------------
re status : 1
re gas used : 299044
final cost : 129054.471101112 GWei (Gas Offer Price * Gas Used)
final cost : 0.32908770 USD
Balance
----------------------------------------------------
balance before : 115792089237316195423570985008687907853269984665640564039457583061627.121056760 GWei
balance after : 115792089237316195423570985008687907853269984665640564039457583061619.525339160 GWei
balance diff price : 7.595717600 GWei
balance diff price : 0.00001785 USD
Each time you deploy the contract, you will get a new contract ID. Every code change needs to be mined into a new block and therefore the API moves. Be aware what version of the API you are using.
To validate everything is working, run the follow make command.
$ export CONTRACT_ID=0x531130464929826c57BBBF989e44085a02eeB120
$ make basic-write
When you run this command, attempt to update the contracts map with the key name and value brianna. You should see the following output if everything is working correctly.
Input Values
----------------------------------------------------
fromAddress: 0x6327A38415C53FFb36c11db55Ea74cc9cB4976Fd
oneETHToUSD: 1571.4114863708066
oneUSDToETH: 0.0006363705551812605
contractID: 0x531130464929826c57BBBF989e44085a02eeB120
version: 1.1
Transaction Details
----------------------------------------------------
hash : 0x270a2757da5b1e5a766dde1d3429271ca74d259c29fe0a67352859978dfcd33c
nonce : 2
gas limit : 250000
gas offer price : 0.896428194 GWei
value : 0 GWei
max gas price : 224107.0485 GWei
max gas price : 0.35 USD
Receipt Details
----------------------------------------------------
status : 1
gas used : 25895
gas price : 0.896428194 GWei
gas price : 0.00 USD
final gas cost : 23213.00808 GWei
final gas cost : 0.04 USD
Logs
----------------------------------------------------
Balance
----------------------------------------------------
balance before : 1.157920892e+68 GWei
balance after : 1.157920892e+68 GWei
balance diff : 17498.96476 GWei
balance diff : 0.03 USD
To see if the value was written to the map for that key, run the follow make command.
$ export CONTRACT_ID=0x531130464929826c57BBBF989e44085a02eeB120
$ make basic-read
You should see the following output if everything is working correctly.
Input Values
----------------------------------------------------
fromAddress: 0x6327A38415C53FFb36c11db55Ea74cc9cB4976Fd
contractID: 0x531130464929826c57BBBF989e44085a02eeB120
version: 1.1
Read Value
----------------------------------------------------
value: brianna