Thread 'tests::save_candid' panicked at 'Cannot use Func directly

peterparker · July 20, 2023, 3:23pm

I use the famous workaround to generate automatically the did files from Rust code (see for example here in Juno).

After upgrading to last ic-cdk = "0.10.0" and candid = "0.9.1", I get following error when I generate the types. Any cluse what’s the issue?

running 1 test
test tests::save_candid … FAILED

failures:

---- tests::save_candid stdout ----
thread ‘tests::save_candid’ panicked at ‘Cannot use Func directly. Use define_function! macro instead.’, /Users/daviddalbusco/.cargo/registry/src/github.com-1ecc6299db9ec823/candid-0.9.1/src/types/reference.rs:83:9
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace

failures:
tests::save_candid

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

error: test failed, to rerun pass -p satellite --lib

lwshang · July 20, 2023, 3:26pm

We changed the way to define function types.

Following code in ic-cdk might help you:

github.com

dfinity/cdk-rs/blob/185f49f1b05838a540033f8e7a38720992d55eae/src/ic-cdk/src/api/management_canister/http_request/types.rs#L14


      
          
          mod transform {
              #![allow(missing_docs)]
          
              // The struct `TransformFunc` is defined by a macro.
              // Adding doc comment directly above the macro doesn't work.
              // The workaround is to re-export it and document there.
              // TODO: upgrade Rust toolchain (https://dfinity.atlassian.net/browse/SDK-1183)
              use super::*;
          
              candid::define_function!(pub TransformFunc : (TransformArgs) -> (HttpResponse) query);
          }
          
          /// "transform" function of type: `func (http_response) -> (http_response) query`
          pub use transform::TransformFunc;
          
          /// Type used for encoding/decoding:
          /// `record {
          ///     response : http_response;
          ///     context : blob;
          /// }`

peterparker · July 20, 2023, 6:06pm

Still got one issue but, almost there. As soon as I got the solution will clean it and share it properly.

peterparker · July 21, 2023, 7:42pm

Finally, I’ve managed to solve all the issues thanks to the help provided by @lwshang and @chenyan (). If anyone else is interested in migrating the ic_cdk to latest version while still generating the Candid files automatically for the Rust code, I’ve documented my entire migration process in the form of a blog post. Check it out!

ps: also crossposted on my website in case you don’t have a medium account.

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Thread 'tests::save_candid' panicked at 'Cannot use Func directly

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