A simple demonstration of cross contract call in cosmwasm

Simple demonstration of Cross Contract Call using Counter example.

When an end user executes message in Counter1 it increases it counter and pass the message to Contract Counter2 . Contract Counter2 increases the count after sucessfully exectuing the message received form Counter1.

This is a trivial example to demonstrate cross-contract calls.

We can query the count from Counter1 to see how many times the message has been success fully executed in Conuter2

• Crate WASM binary of the contracts by running

  cargo wasm or RUSTFLAGS='-C link-arg=-s' cargo build --release --target wasm32-unknown-unknown --lib

• Initialize the terminal and set the ENV by running

  source <(curl -sSL https://raw.githubusercontent.com/CosmWasm/testnets/master/malaga-420/defaults.env)

• Deploy generated WASM binary

  RES=$(wasmd tx wasm store <WASM_BINARY_PATH> --from <WALLET_ADDRESS> $TXFLAG -y --output json -b block)

• Extract the Contract CODE_ID from Result of previous execution

  CODE_ID=$(echo $RES | jq -r '.logs[0].events[-1].attributes[0].value')

• Instantiate contract by provinding Instantiate message

  wasmd tx wasm instantiate $CODE_ID "$INIT" --from <WALLET_ADDRESS> --label "<LABEL>" $TXFLAG -y --no-admin

• Get the contract address

  CONTRACT=$(wasmd query wasm list-contract-by-code $CODE_ID $NODE --output json | jq -r '.contracts[-1]')

Now you can execute messages , query results from the contract using contract address.