When a Vec<_> is the first parameter of a function in the Sway contract, fuels-ts encodes this properly. However, it seems like when the Vec isn't the first parameter to the function, the Vec is encoded incorrectly. This contains a repro of the issue.
To illustrate, there are 2 functions found in contract/src/main.sw:
// Returns the length of the vec, and the first 3 elements.
// When the vec is the only input, it seems to work as expected
fn vec_as_only_param(input: Vec<u64>) -> (u64, Option<u64>, Option<u64>, Option<u64>) {
(
input.len(),
input.get(0),
input.get(1),
input.get(2),
)
}
// Returns the length of the vec, and the first 3 elements.
// When there is another param, the elements aren't what's expected!
fn u32_and_vec_params(foo: u32, input: Vec<u64>) -> (u64, Option<u64>, Option<u64>, Option<u64>) {
(
input.len(),
input.get(0),
input.get(1),
input.get(2),
)
}
Then in src/test.ts, fuels-ts is used to call both these functions with the same input vec, [1, 2, 3].
When vec_as_only_param is called, the expected values are returned-- a length of 3, the first element as 1, the second as 2, the third as 3.
However when u32_and_vec_params is called, the values returned are not what's expected. The length of 3 is interestingly correct, but some very large elements are returned.
You just need forc and fuel-core installed to repro.
First, install dependencies:
yarn
In a separate terminal, run this to start a local Fuel node that the test contract will be deployed to (requires fuel-core in your PATH):
yarn local-node
Then while the local node is still running in another terminal, run this to build the contracts & generate TS types:
yarn build
And finally, to run the repro script:
yarn test
You'll see an output like this:
Deploying contract...
Contract ID:
{
contract: '0x6570d32e7b362ffa6224071fb7ea0a2f5429b3d574441e9b3f19f38f4550147c'
}
The vec input passed in: [ 1, 2, 3 ]
When calling `vec_as_only_param`:
Input len: 3
Element 0: <BN: 0x1>
Element 1: <BN: 0x2>
Element 2: <BN: 0x3>
When calling `u32_and_vec_params`:
Input len: 3
Element 0: <BN: 0x719bbe7ef8cf1bc4>
Element 1: <BN: 0xd3b45d9058ac045e>
Element 2: <BN: 0xcdefe2fc9e9bd6bd>
As you can see, vec_as_only_param has the expected return values, but u32_and_vec_params has some bogus elements
I'm running with a fresh fuelup update, giving these versions:
$ fuelup show
Default host: aarch64-apple-darwin
fuelup home: /Users/trevor/.fuelup
installed toolchains
--------------------
latest-aarch64-apple-darwin (default)
hyperlane
active toolchain
-----------------
latest-aarch64-apple-darwin (default)
forc : 0.35.5
- forc-client
- forc-deploy : 0.35.5
- forc-run : 0.35.5
- forc-doc : 0.35.5
- forc-explore : 0.28.1
- forc-fmt : 0.35.5
- forc-index : 0.6.1
- forc-lsp : 0.35.5
- forc-wallet : 0.2.1
fuel-core : 0.17.3
fuel-indexer : 0.6.1
And node 16:
$ node --version
v16.19.1
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