Hey yeah we’ve been able to generate candid from rust for a while now. Not sure why it’s still kinda hidden from documentation. All the psychedelic projects use it ! You just need to add the CandidType derive, and the candid_service(query/update/init) macro to all the methods and types that need to be exported. Then, the export_service!() macro will generate function that returns the candid from rust, which can be run differently depending on the project setup
for projects using cdylib/lib.rs: You can make a rust test called save_candid, which would save the candid to a file in the project root when running cargo test. This works really well for multi canister architectures.
Example: cap/lib.rs at main · Psychedelic/cap · GitHub
Personally, I’ve been moving solely to the lib.rs/rust test flow, to allow exporting multiple canisters did interfaces with a single command. If you have other tests as well, you can run only the candid tests using cargo test save_candid
We also plan on making this easy and automatic with the ic_kit - Rust, where we’d include the corresponding candid_method with the #[update/query/init] macro automatically
Of course! Having auto generation makes work so much easier.
The cargo manifest dir is a environment variable provided (by cargo) during the test run, of the location of the crates cargo.toml. This is the crate toml, not the workspace, so we step back 2 parent directories to the project root, and place the candid in the candid/<name>.did
@lastmjs Exactly, I usually like having the step automatically done through a makefile (make build does the candid gen, then the dfx build).
Separately, we’re finding a solution with the kit to tie this all together. In 0.5, query/update/init macros automatically use the candid_method, as well as the candid being exported with a single macro at the end of your file. Ideally we’re looking for a solution to just do everything on compile, but already the process is 10x better
can this work for ic-cdk = “0.10.0” ?
I`m trying to generate did file for a half day .
Still like an ape in Space Odyssey.
The official doc is lake of that part on how to auto generate
did file for frontend canister use.