Proof Of Concept for deploying, instantiating, executing and querying smart contracts on the Juno blockchain. We are launching on the latest testnet of Juno Moneta (moneta-alpha v2.0.0-alpha.3)
We use a very basic smart contract, the CW-template offered by Cosmwasm (1.0.0-beta) that allows for storing and reading count from a state.
cargo generate --git https://github.com/CosmWasm/cw-template.git --name juno_stkd_poc (https://github.com/InterWasm/cw-template)
cd juno_stake_poc
cargo clean
cargo build
cargo test
To produce an efficient stripped wasm file to upload to Juno
docker run --rm -v "$(pwd)":/code \
--mount type=volume,source="$(basename "$(pwd)")_cache",target=/code/target \
--mount type=volume,source=registry_cache,target=/usr/local/cargo/registry \
cosmwasm/rust-optimizer:0.12.4
junod tx wasm store juno_stkd_poc.wasm --from juno_test --gas-prices 0.025ujunox --gas-adjustment 1.4 -b block --gas auto
In my case, I stored the contract with code-id: 22.
We can instantiate a smart contract on testnet using Junod (juno build) using
junod tx wasm instantiate 22 \
'{"count": 32}' \
--label "juno_testing" --from juno_test --gas-prices 0.025ujunox --gas-adjustment 1.4 -b block --gas auto
This sets the initial count of the smart contract at 32
We get a testnet smart contract address: juno13wxll57yp7l6ansarjtgqg79gnv83wacl5pfsypj82femvrcszrq32wv3t
Now we can execute and query messages
junod tx wasm execute "juno13wxll57yp7l6ansarjtgqg79gnv83wacl5pfsypj82femvrcszrq32wv3t" \
'{"increment": {}}' \
--from juno_test --gas-prices 0.025ujunox --gas-adjustment 1.4 -b block --gas auto
This increments the count in the state of the smart contract by 1
To query the count in the state of the smart contract we can query from the terminal junod query wasm contract-state smart juno13wxll57yp7l6ansarjtgqg79gnv83wacl5pfsypj82femvrcszrq32wv3t '{"get_count":{}}'
we get count: 33