Code here : https://github.com/Salmandabbakuti/Smartcontract-Upgrades
gochain.io
1.gochain Web3 library
curl -LSs https://raw.githubusercontent.com/gochain-io/web3/master/install.sh | sh
2.go chain wallet and some GO-tokens.
go to https://explorer.gochain.io/wallet/create store your privatekey somewhere else safe.
to do any operations on network, you need tokens. so to get testnet tokens join their official telegram channel https://t.me/gochain_testnet and ask them to provide some testnet tokens by pasting your previously created wallet address**
a). Export private key to your Env variables (require root user previligies $ sudo -s )
export WEB3_PRIVATE_KEY=0x...
Check if your private key is correct by this command $ web3 myaddress if this command returns your wallet address that you created as in pre-requisites, you good to go.
b). Use the GoChain testnet
$ export WEB3_NETWORK=testnet
a). Compiling Contract
copy greeter.sol file to your directory, then
web3 contract build greeter.sol
b). Deploying contract
web3 contract deploy --upgradeable greeter.bin
once deployed, you will get contract address, add this address to env. variables
export WEB3_ADDRESS=0x...
deploying upgradable contract actually deploy two contracts original greeter contract and proxy contract which will redircts calls to upgraded contract. check where our proxy contract redirecting calls and storage by this command
web3 contract target
c). Writing Transaction (Greeting)
web3 contract call --abi greeter.abi --function greet "Hi Guys, This is from Old Contract"
once transaction went through, we succesfully added greeting on blockchain. but still there is no option to return added greeting. thats why we are trying to upgrade contract with new code.
Copy greeterv2.sol to your directory and then,
web3 contract build greeterv2.sol
web3 contract deploy greeter.bin
Once deployed, it will return newly deployed contract address. using this address we can upgraade our old contract greeter to greeterv2 run below command to finish one last step
web3 contract upgrade --to 0x.... //add your newly deployed contract address here
now you can call new contract with the same address. in old contract, there is no getter function for variable , in new contract, we added getter function getGreeting. now you can call it using this command.
web3 contract call --abi greeter.abi --function getGreeting
>Hi Guys, This is from Old Contract
Upgradeable contracts also include the ability to pause & resume execution. if you found any bug in contract you can simply pause (or resume later) the contract with these commands
web3 contract pause
web3 contract resume
once paused, if you call function you will get unmarshalling empty output string till you resume contract.
BOOM...