5 releases
0.11.0 | Aug 22, 2023 |
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0.10.3 | Aug 3, 2023 |
0.10.2 | Jul 24, 2023 |
0.10.1 | Jul 22, 2023 |
0.10.0 | Jul 22, 2023 |
#4 in #juno
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Used in 2 crates
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Juno Network Bindings
CosmWasm bindings to custom TokenFactory features from Osmosis.
Prerequisites
Before starting, make sure you have rustup along with a
recent rustc
and cargo
version installed. Currently, we are testing on 1.64+.
And you need to have the wasm32-unknown-unknown
target installed as well.
You can check that via:
rustc --version
cargo --version
rustup target list --installed
# if wasm32 is not listed above, run this
rustup target add wasm32-unknown-unknown
running tests
cargo test --locked
Compile
cargo build --locked
generate schema for osmosis contract
cd contracts/reflect
cargo schema --locked
This will give you a schema at contracts/reflect/schema/
build contract
cd contracts/reflect
cargo wasm
Understanding the tests
The main code is in src/contract.rs
and the unit tests there run in pure rust,
which makes them very quick to execute and give nice output on failures, especially
if you do RUST_BACKTRACE=1 cargo unit-test
.
We consider testing critical for anything on a blockchain, and recommend to always keep the tests up to date.
Generating JSON Schema
While the Wasm calls (instantiate
, execute
, query
) accept JSON, this is not enough
information to use it. We need to expose the schema for the expected messages to the
clients. You can generate this schema by calling cargo schema
, which will output
4 files in ./schema
, corresponding to the 3 message types the contract accepts,
as well as the internal State
.
These files are in standard json-schema format, which should be usable by various client side tools, either to auto-generate codecs, or just to validate incoming json wrt. the defined schema.
Preparing the Wasm bytecode for production
Before we upload it to a chain, we need to ensure the smallest output size possible, as this will be included in the body of a transaction. We also want to have a reproducible build process, so third parties can verify that the uploaded Wasm code did indeed come from the claimed rust code.
To solve both these issues, we have produced rust-optimizer
, a docker image to
produce an extremely small build output in a consistent manner. The suggest way
to run it is this:
docker run --rm -v "$(pwd)":/code \
--mount type=volume,source="$(basename "$(pwd)")_cache",target=/code/target \
--mount type=volume,source=registry_cache,target=/usr/local/cargo/registry \
cosmwasm/workspace-optimizer:0.12.8
Or, If you're on an arm64 machine, you should use a docker image built with arm64.
docker run --rm -v "$(pwd)":/code \
--mount type=volume,source="$(basename "$(pwd)")_cache",target=/code/target \
--mount type=volume,source=registry_cache,target=/usr/local/cargo/registry \
cosmwasm/workspace-optimizer-arm64:0.12.8
We must mount the contract code to /code
. You can use a absolute path instead
of $(pwd)
if you don't want to cd
to the directory first. The other two
volumes are nice for speedup. Mounting /code/target
in particular is useful
to avoid docker overwriting your local dev files with root permissions.
Note the /code/target
cache is unique for each contract being compiled to limit
interference, while the registry cache is global.
This is rather slow compared to local compilations, especially the first compile of a given contract. The use of the two volume caches is very useful to speed up following compiles of the same contract.
This produces an artifacts
directory with a PROJECT_NAME.wasm
, as well as
checksums.txt
, containing the Sha256 hash of the wasm file.
The wasm file is compiled deterministically (anyone else running the same
docker on the same git commit should get the identical file with the same Sha256 hash).
It is also stripped and minimized for upload to a blockchain (we will also
gzip it in the uploading process to make it even smaller).
Writing contracts that interact with Osmosis
Choosing a network
To use these bindings in your contracts, you'll need to either deploy them to the testnet or have a localnet setup. Read the official docs to learn how to do this.
Note that Cosmwasm on Osmosis is permissioned, so you'll have to disabled permissioned Cosmwasm for easier development.
Parametrizing your inputs and results with the Osmosis types
in order for the integration to work the following types, defined in this bindings, will need to be used as the type of your inputs/outputs or to parametrize Cosmwasm types:
OsmosisQuery
, which implementsCustomQuery
OsmosisMsg
, which implementCosmosMsg
Specifically, any function that uses Deps
or DepsMut
and needs to interact
with the chain will need to parametrize them as Deps<OsmosisQuery>
and
DepsMut<OsmosisQuery>
, and any Response
that adds messages or submessages
to be executed needs to be parametrized as Response<OsmosisMsg>
.
Executing Osmosis queries
If you want to execute Osmosis queries inside your contract, you can do this without the need of message passing (see the Cosmwasm documentation on QuerySemantics).
To do this you can create an OsmosisQuery
and a QueryRequest<OsmosisQuery>
to be dispatched by the querier.
The following code createds a PoolState
variant of OsmosisQuery
and passes it
to the querier:
let pool_query = OsmosisQuery::PoolState { id: 1 };
let query = QueryRequest::from(pool_query);
let pool_info: PoolStateResponse = deps.querier.query(&query)?;
The following queries the spot price of two denoms but uses the helper
spot_price
function of OsmosisQuery
to simplify the query creation:
let spot_price = OsmosisQuery::spot_price(1, &denom1, &denom2);
let query = QueryRequest::from(spot_price);
let response: SpotPriceResponse = deps.querier.query(&query)?;
Please note that the deps
used in both these queries need to be of type
Deps<OsmosisQuery>
(or DepsMut<OsmosisQuery>
). Otherwise the default
implementation would assume an Empty
custom query,
Executing transactions as (sub)messages
To execute osmosis transactions as part of your contract's execute response. You
can create create the OsmosisMsg
and provide it as part of your contract's response.
Here is an example of how to execute a swap as part of the
See the Cosmwasm documentation on submessages for more details about how this gets executed and how to handle replies.
fn execute_swap(
_deps: DepsMut,
_info: MessageInfo,
input: u128,
min_output: u128,
) -> Result<Response<OsmosisMsg>, ContractError> {
let swap = OsmosisMsg::simple_swap(
1,
"uosmo",
"uion",
SwapAmountWithLimit::ExactIn {
input: Uint128::from(input),
min_output: Uint128::from(min_output),
},
);
let msgs = vec![SubMsg::new(swap)];
Ok(Response::new()
.add_attribute("action", "execute_swap")
.add_submessages(msgs))
}
Note that DepsMut
is not parametrized in that function as it's not being used
in it (so the default DepsMut<Empty>
sufices). However, if your contract is
using the deps
somewhere else, chances are you will want to unify the types
along your contract, so having the input parameter be DepsMut<OsmosisQuery>
is
probably a good idea.
For more information on the parameters of the OsmosisMsg
used above, see the
Osmosis Cosmwasm API documentation (TBD).
Executing custom transactions
If the transaction you want to execute is not provided by this API, you can
still execute it using CustomMsg
.
ToDo: Add an example.
Writing integration tests that mock the Osmosis responses
To be able to write tests for the functions that depend on interacting with Osmosis, you will need to mock the chain so that it can handle your contract requests and provide the right responses.
To do that, you will need to:
Create and initialize an app
let mut app = OsmosisApp::new();
//... setup your variables here
app.init_modules(|router, _, storage| {
router.custom.set_pool(storage, 1, &pool).unwrap();
router
.bank
.init_balance(storage, &owner, init_funds)
.unwrap();
router
.bank
.init_balance(storage, &borrower, pool_funds.clone())
.unwrap();
});
Define a wrapper for your contract
pub fn contract<C, Q>() -> Box<dyn Contract<C, Q>>
where
C: Clone + Debug + PartialEq + JsonSchema + DeserializeOwned + 'static,
Q: CustomQuery + DeserializeOwned + 'static,
ContractWrapper<
ExecuteMsg,
InstantiateMsg,
QueryMsg,
ContractError,
ContractError,
cosmwasm_std::StdError,
OsmosisMsg,
OsmosisQuery,
>: Contract<C, Q>,
{
let contract = ContractWrapper::new(execute, instantiate, query); //.with_reply(reply);
Box::new(contract)
}
Instantiate your contract
let contract: Box<dyn Contract<OsmosisMsg, OsmosisQuery>> = contract();
let code_id = app.store_code(contract);
// Instantiate the contract
let msg = InstantiateMsg {
admin: None,
funds_denom: "usdc".to_string(),
collateral_denom: "gamm/pool/1".to_string(),
};
let contract_addr = app
.instantiate_contract(code_id, owner.clone(), &msg, &[], "shark", None)
.unwrap();
Execute your messages and test the results
let balance = app.wrap().query_balance(&borrower, "usdc").unwrap();
assert_eq!(balance.amount, Uint128::new(0));
let amount = 6;
let msg = ExecuteMsg::Borrow { amount }; // This is a message defined by your contract
let wasm_msg = CosmosMsg::Wasm(WasmMsg::Execute {
contract_addr: contract_addr.into(),
msg: to_binary(&&inner_msg).unwrap(),
funds: vec![],
});
app.execute(borrower.clone(), wasm_msg).unwrap();
let balance = app.wrap().query_balance(&borrower, "usdc").unwrap();
assert_eq!(balance.amount, Uint128::new(amount));
Dependencies
~3.5–5.5MB
~114K SLoC