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Command to instantiate contract on chain

Created by: ascjones

WIP (see todos)

Following on from the deploy command: https://github.com/paritytech/ink/issues/134, the next step is to instantiate the contract on chain.

Command Name

The name of the command is important - we need to choose whether we should be consistent with the naming in polkadot-js UI:

  • put_code => Upload
  • create => Deploy.

For this we would need to change our existing deploy command to upload.

Alternatively we could align with the names of the contract runtime calls: put_code (or simply put?) and create.

UX

cargo contract create ARGS

Args

  • code hash: the hash of the contract code on chain: result of the deploy command
  • Endowment todo
  • Gas: (optional) Max gas for deploying contract, defaults to 500000
  • Url: (optional) Websockets url to a node on the target chain. defaults to http://localhost:9944
  • Secret URI: The secret URI
  • Counstructor Args todo

Output

Should return the AccountId of the instantiated contract.

Implementation

  • See existing deploy implementation for constructing extrinsic utilising subxt

Constructor Args

  • Need to figure out the best way to supply constructor args to be added to the extrinsic.
  • Could support parsing of certain contract primitives from the command, and use contract abi metadata to determine the required signature and perform validation/parsing of the input. todo: elaborate