chore(cbindings): cbindings rust simple libwaku integration example #2089
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Ivansete-status
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richard-ramos,
arnetheduck and
SionoiS
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You can find the image built from this PR at Built from fd7bcec |
SionoiS
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Sep 28, 2023
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| let buffer_utf8 = | ||
| String::from_utf8(slice::from_raw_parts(buffer as *mut u8, buffer_len) | ||
| .to_vec()) | ||
| .expect("valid utf8"); |
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You could do the allocation later in the closure. Using str::from_utf8 here instead.
examples/rust/src/main.rs
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| ); | ||
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| // Extracting the current waku version | ||
| let version: Arc<RefCell<String>> = Arc::new(RefCell::new(String::from(""))); |
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No need to ref count here since you don't clone. Also you could use a OnceCell since you won't be modifying more than once.
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Thanks so much! This has been applied in 36df31b
examples/rust/src/main.rs
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| // Extracting the default pubsub topic | ||
| let default_pubsub_topic: Arc<RefCell<String>> = Arc::new(RefCell::new(String::from(""))); |
examples/rust/src/main.rs
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| *version.borrow_mut() = data.to_string(); | ||
| }; | ||
| let cb = get_trampoline(&closure); | ||
| waku_set_user_data(&mut ctx, &closure as *const _ as *const c_void); |
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I think it should be possible to get rid of this. See experiment here: https://github.com/richard-ramos/test_rust_ffi/blob/af098508acfae181df508eee524d75f70af68010/rustlib/src/lib.rs#L29-L38
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It looks beautiful indeed!
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Description
The purpose of this PR is to show how the
libwakucan be used from Rust.So far, it performs the following points:
waku_new(create waku node.)waku_version(extract default pubsub topic to the Rust space.)waku_default_pubsub_topic(extract default pubsub topic to the Rust space.)The "trampoline" technique is being used in order to properly pass Rust closures as callbacks to the
libwaku. Therefore, we don't have the same concise code that we can achieve in cpp but it is indeed feasible. The code can become more concise by definingmacros!and the idea for the next step would be to properly expose a safe API to the user and leave the unsafe code managed internally.Notice that this PR also includes changes in
libwakuthat make it avoid the use of global variables, as stated in the next recommendation: #1865 (comment). This should definitely go in a separate PR.cc - @jm-clius @fryorcraken @alrevuelta @vpavlin @NagyZoltanPeter @gabrielmer