Cross contract calls, env.invoke_contract() and passing arguments | Stellar Developers | Page 1

agile fern Jun 9, 2023, 2:08 PM

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I've been trying to make a cross contract call without importing the other contracts .wasm
So, there is env.invoke_contract() which is usable for this.

But, the arguments need to be passed in as vec<RawVal>
So, with for example an increment type function, we can pass an u32 with .into()
env.invoke_contract::<RawVal>(&target_contract, &Symbol::new(&env, "increment"), vec![&env, x.into()]);

But for Hello World, I want to pass "World".
How would one cast/convert/fit/force a String or Symbol into RawVal for use here?
env.invoke_contract::<RawVal>(&target_contract, &Symbol::new(&env, "Hello"), vec![&env, ???]);

hoary quail Jun 9, 2023, 2:18 PM

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probably like that:
env.invoke_contract::<RawVal>(&target, &Symbol::new(&env, "Hello"), vec![&env, *Symbol::new(&env, "World").as_raw()]);

agile fern Jun 9, 2023, 2:43 PM

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Yeah that seems to work, cool!
Now I'm not sure what I did earlier that kept giving me errors

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And now I do. I tried to get my pseudo contract to return the result of Symbol::new(&env, "World").as_raw() first, to see what happens.
That causes a panic:

hoary quail Jun 9, 2023, 2:52 PM

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got that too while trying too, then tried to put RawVal as return type which is not possible

agile fern Jun 9, 2023, 2:58 PM

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That's what triggers the error, returning RawVal
Awesome, thanks

remote folio Jun 9, 2023, 5:26 PM

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one nice way to do that with sdk is (a,b,c).into_val(env) where a,b,c are arbitrary SDK types (e.g. symbols). e.g. here https://github.com/stellar/soroban-examples/blob/main/timelock/src/test.rs#L87 several UDTs are converted into vec of raw vals. don't forget comma for single-element tuples ((a,).into_val(env)

frozen coyote Jun 9, 2023, 5:36 PM

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what about implementing intoval

remote folio Jun 9, 2023, 5:40 PM

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any contracttype implements it

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(and any SDK type, that is)

frozen coyote Jun 9, 2023, 5:42 PM

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ah just saw the message that the error is triggered by returning a rawval not actually converting it

remote folio Jun 9, 2023, 5:45 PM

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maybe that's a bug actually

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something about symbol conversion

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you definitely should be able to return RawVal from a function

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if someone has an example to share, that would be great. I'm not sure from this thread what exactly has been done here

hoary quail Jun 9, 2023, 6:13 PM

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these contract functions compile:

    pub fn get_rawvalu32(_env: Env) -> RawVal {

        let r: u32 = 42;
        r.into()
    }
    pub fn get_rawvalsym(env: Env) -> RawVal {

        *Symbol::new(&env, "raw").as_raw()
    }

Gives:

$ soroban contract invoke --wasm target/wasm32-unknown-unknown/release/game1.wasm --id 123 -- get_rawvalu32
error: cannot print result U32(42): Invalid pair U32(
    42,
) Val
$ soroban contract invoke --wasm target/wasm32-unknown-unknown/release/game1.wasm --id 123 -- get_rawvalsym
thread 'main' panicked at 'not yet implemented: Symbol(
    ScSymbol(
        StringM(raw),
    ),
) doesn't have a matching Val', .cargo/registry/src/github.com-1ecc6299db9ec823/soroban-cli-0.8.0/src/strval.rs:492:27
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

agile fern Jun 9, 2023, 6:33 PM

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The 'not yet implemented' panic implies it is on a list somewhere

remote folio Jun 9, 2023, 6:56 PM

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ah, that's a CLI issue. the tests work, right?

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I would suggest opening an issue for soroban-tools: https://github.com/stellar/soroban-tools/issues?q=is%3Aissue+is%3Aopen+. they may or may not be aware of this, but search doesn't return anything for RawVal so chances are this would just be missed otherwise

#Cross contract calls, env.invoke_contract() and passing arguments