onchainkeeper is a Cosmos module that acts as an on-chain Chainlink keeper, triggering wasm contract logic at the beginning and the end of every block.
wasmapp is a Cosmos chain for testing the onchainkeeper module.
Step 1: Store and instantiate an instance of a cw-cron-example contract. This cron contract simply increases b by 1 at the beginning of the block, and increases e by 1 at the end of the block.
wasmappd tx wasm store artifacts/cw_cron_example.wasm --from bob --chain-id wasmapp --gas auto --gas-adjustment 1.2
wasmappd tx wasm instantiate 1 '{}' --from bob --label "cw-cron-example" --admin cosmos13577qg2j4q2dvgl90yg6ulk6juh5wgtwkd9pa5 --gas auto --gas-adjustment 1.2 --chain-id wasmapp Try querying state of the cron, of course this time the values are all 0.
wasmappd q wasm contract-state smart cosmos14hj2tavq8fpesdwxxcu44rty3hh90vhujrvcmstl4zr3txmfvw9s4hmalr '{"get_config": {}}'The output:
data:
b: 0
e: 0
Step 2: Admin (bob: cosmos13577qg2j4q2dvgl90yg6ulk6juh5wgtwkd9pa5) of this cron contract submits a tx to register it with the module.
wasmappd tx onchainkeeper register-cron cosmos14hj2tavq8fpesdwxxcu44rty3hh90vhujrvcmstl4zr3txmfvw9s4hmalr --from bob --gas auto --gas-adjustment 1.2 --chain-id wasmappStep 3: Security admin (alice: cosmos105khsf5w9x08alwcqx055nhag2xm7dcahxegda) of the module accepts the above registration by submitting a tx to activate the cron contract.
wasmappd tx onchainkeeper activate-cron cosmos14hj2tavq8fpesdwxxcu44rty3hh90vhujrvcmstl4zr3txmfvw9s4hmalr --from alice --gas auto --gas-adjustment 1.2 --chain-id wasmappStep 4: Try querying state of the cron contract after some blocks.
wasmappd q wasm contract-state smart cosmos14hj2tavq8fpesdwxxcu44rty3hh90vhujrvcmstl4zr3txmfvw9s4hmalr '{"get_config": {}}'Output:
data:
b: 9
e: 10
In the above output, you can see the value of b is one less than e. Why? Because in the first block where cron takes effect, the contract only received the SudoMsg::CronEndBlock message. Only when this block is finalized and move to the next block, the contract starts receiving SudoMsg::CronBeginBlock
Finally, immediately query state of the cron contract in the next block.
wasmappd q wasm contract-state smart cosmos14hj2tavq8fpesdwxxcu44rty3hh90vhujrvcmstl4zr3txmfvw9s4hmalr '{"get_config": {}}'Output:
data:
b: 10
e: 11