A simple example demonstrating cross-contract calls in CosmWasm smart contracts

Related tags

Cryptography cross-contract-example
Overview

Cross-contract calls

This tutorial demonstrates cross-contract calls with CosmWasm v1.

Overview

An end user calls the reservation contract to register for an upcoming dinner. The user will have to pay a little to get on the list, unless they've been given a scholarship and added to a special list. The special list is its own contract, and the list of registrants also lives in another contract.

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

Contracts

There are three contracts here:

  1. Reservation — this contract doesn't do much besides perform cross-contract calls to dinner contracts. It also stores how many times this contract has successfully registered people for dinner. 🍽️
  2. Scholarship list — using the whitelist contract from cw-plus, we keep a list of addresses that can register for dinner without paying. The compiled contract lives in the directory whitelist-binary.
  3. Dinners — the dinner contract keeps track of dinner attendees. For demonstration purposes, each instance keeps track of only one dinner. For production, you may not want to implement it this way.

Scenarios

Assuming there haven't been mistakes in deploying and initializing the three contracts, here are the success and failure scenarios.

Success

A normal person calls the reservation contract attaching funds to pay for their attendance.

A person whose address exists on the scholarship contract calls the reservation contract, without attaching funds.

Failure

A normal person calls the reservation contract but doesn't attach enough funds.

A person calls the reservation contract, but provides an invalid dinner contract address.

A registered person attempts to register again.

The dinner registration window has closed and a person tries to register.

Starting csli

/Users/mike/Documents/csli/bin/cosmjs-cli.mjs --init cosmjs-cli-helpers/cosmwasm-init.ts --code cosmjs-cli-helpers/cosmwasm-code.ts
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Comments
  • Create contracts with cross-contract call

    Create contracts with cross-contract call

    Closes #1 Changed dinner and demo-totals so that they work and demo-totals makes a cross-contract call to dinner. Created tests and scripts build.sh and deploy.sh for building and deploying to uni-3 testnet.

    Also dinner doesn't actually make cross-contract call to cw1_whitelist through submessages, it only queries the state:

    deps.querier.query_wasm_smart(
    SCHOLARSHIPS_ADDRESS.load(deps.storage)?,
    &cw1_whitelist::msg::QueryMsg::AdminList::<String> {},
)?;

    Is it okay for this example?

    opened by NinoLipartiia 2
  • Get cross-contract calls working!

    Get cross-contract calls working!

    Nothing works, I'm pretty sure. But we can start out by reading the README and undestanding what's supposed to happen.

    Also, this should help, I drew it myself: PXL_20220822_072501530 MP_2

    Then, immerse yourself in love, and in this entire page. Memorize it: https://docs.cosmwasm.com/docs/1.0/smart-contracts/contract-semantics/#submessages

    opened by mikedotexe 0
  • Fix README

    Fix README

    Look at the picture here #1 and notice that some things have changed from the README. like I think it used to be called "reservation" but it's now "demo totals"

    Go around clean stuff up. Also, the last section in the README is about the CSLI REPL, which isn't what we're about anymore. That's old hat. We're now onto: https://github.com/csli-tools/cli

    So let's figure out how to remove/replace that last part, too.

    opened by mikedotexe 0
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