An Example of Non-deterministic Contract (using network resources)

Summary

In the master branch, it uses TcpStream::connect and it always returns Err(something).

In the ureq branch, it uses ureq::get and ureq::Request::call and it cannot be stored in chain with Deserialization error.

Compile and Execute

This section is summary of https://docs.cosmwasm.com/getting-started/compile-contract.html . For set up the environment, see https://docs.cosmwasm.com/getting-started/installation.html and https://docs.cosmwasm.com/getting-started/setting-env.html .

To compile this to wasm suitable to use in CosmWasm, execute the follows.

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:0.9.1

Then, contract.wasm is the output.

To know how to install and execute the wasm, see https://docs.cosmwasm.com/getting-started/interact-with-contract.html . It is a very kind documentation. (However there is a bug. see also CosmWasm/docs-deprecated#26 )