subsecond examples

[devnought]

I'm very interested in trying to integrate subsecond into one of my projects, but I'm having issues even cobbling together an example from the snippets available in the 0.7.0-alpha.0 notes and the subsecond readme. I can get it to compile and run via dx serve, but it does not appear to hot-load changes.

I have the following trivial example:

fn main() {
    println!("-- STARTING");

    loop {
        std::thread::sleep(std::time::Duration::from_secs(1));
        subsecond::call(|| tick());
    }
}

fn tick() {
    println!("edit me to see the loop in action!!!");
}

When executed with dx serve, changing the contents of the tick() function forces a recompile and restart of the entire application.

I feel like there's something trivial I missed when trying to create my own example.

If it helps, I'm attempting to run this on Windows 11 using the MSVC toolchain.

[jkelleyrtp]

try dx serve --hotpatch

Hotpatching is currently disabled by default until we're confident it's stable.

[devnought]

When running dx serve --hotpatch with the same example, the linker is complaining about not being able to find core Windows libraries:

Failed to generate fat binary: rust-lld: error: could not open 'kernel32.lib': no such file or directory
rust-lld: error: could not open 'kernel32.lib': no such file or directory
rust-lld: error: could not open 'ntdll.lib': no such file or directory
rust-lld: error: could not open 'userenv.lib': no such file or directory
rust-lld: error: could not open 'ws2_32.lib': no such file or directory
rust-lld: error: could not open 'dbghelp.lib': no such file or directory

[devnought]

Getting back to this, I managed to at least temporarily work around the linker issue by manually specifying linker search paths:

fn main() {
    println!(
        r"cargo:rustc-link-search=C:\Program Files (x86)\Windows Kits\10\Lib\10.0.22000.0\um\x64"
    );
    println!(
        r"cargo:rustc-link-search=C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.43.34808\lib\x64"
    );
    println!(
        r"cargo:rustc-link-search=C:\Program Files (x86)\Windows Kits\10\Lib\10.0.22000.0\ucrt\x64"
    );
}

Just to be clear, this appears to be an issue only when building and running via dx serve --hotpatch, and manually specifying these linker search paths isn't normally required on Windows.

Now when running the above I get the following when editing the body of the tick() function:

[dev] Ignoring hotpatch since there is no ASLR reference. Is the client connected?

[devnought]

Further progress based on this issue:
#4195

The CLI does attempt to hotpatch, but now the linker portion of hot-patching has no knowledge of where those OS libs are that I had to kludge a workaround for in my build script.

My demo is as follows:

fn main() {
    println!("-- STARTING");
    dioxus_devtools::connect_subsecond();

    loop {
        std::thread::sleep(std::time::Duration::from_secs(1));
        subsecond::call(|| tick());
    }
}

fn tick() {
    println!("edit me to see the loop in action!");
}

And the output when I start and edit for completeness:

03:07:08 [dev] Build completed successfully in 13947ms, launching app! 💫
03:07:09 [windows] -- STARTING
03:07:09 [windows] edit me to see the loop in action!
03:07:10 [windows] edit me to see the loop in action!
03:07:11 [windows] edit me to see the loop in action!
03:07:12 [windows] edit me to see the loop in action!
03:07:13 [windows] edit me to see the loop in action!
03:07:14 [windows] edit me to see the loop in action!
03:07:15 [windows] edit me to see the loop in action!
03:07:15 [dev] Failed to generate patch: rust-lld: error: could not open 'shlwapi.lib': no such file or directory
rust-lld: error: could not open 'kernel32.lib': no such file or directory
rust-lld: error: could not open 'advapi32.lib': no such file or directory
rust-lld: error: could not open 'ntdll.lib': no such file or directory
rust-lld: error: could not open 'userenv.lib': no such file or directory
rust-lld: error: could not open 'ws2_32.lib': no such file or directory
rust-lld: error: could not open 'dbghelp.lib': no such file or directory
03:07:15 [dev] Build failed: I/O Error: The system cannot find the file specified. (os error 2)
03:07:16 [windows] edit me to see the loop in action!
03:07:17 [windows] edit me to see the loop in action!

[devnought]

Coming back to this after some time, this example does work provided I use one of the Visual Studio developer shells, but not any other shell.