HTTP Request to server running in sidecar

[nikolaswise]

I've got a sidecar running oxigraph_server (I think it's running at least!) but I cannot find any documentation on how to make HTTP requests to this server from my front-end application. I've found some issues referencing that this is doable, but I cannot find any documentation around sidecars at all.

What is going on here? How do I HTTP my server binary?

[FabianLars]

It should be the same as any other server (remote). So the webview's built-in fetch/http should work and if it doesn't there is Tauri's own http module: https://tauri.app/v1/api/js/http

[nikolaswise]

Oh I see! So it will just run at localhost:port and be a regular ol' thing. That means my sidecar server is not running when I start the application. I guess I'm not totally clear on where or how I execute the sample code provided in the guide – I have a template generated main rust file:

fn main() {
    tauri::Builder::default()
        .invoke_handler(tauri::generate_handler![greet])
        .invoke_handler(tauri::generate_handler![sparql_query])
        .run(tauri::generate_context!())
        .expect("error while running tauri application");Z
}

Where do I want to run the Command?

let (mut rx, mut child) = Command::new_sidecar("oxigraph_server")
  .expect("failed to create `oxigraph_server` binary command")
  .spawn()
  .expect("Failed to spawn sidecar");

I'm assuming that is what executes the binary – it's also unclear to be how I run oxigraph_server serve; the only example I saw that used .args(["serve"]) before .spawn() did not work out.

[nikolaswise]

Oh wait this seems like it works great actually

fn main() {
    use tauri::api::process::Command;
    Command::new_sidecar("oxigraph_server")
      .expect("failed to create `oxigraph_server` binary command")
      .args(["serve"])
      .spawn()
      .expect("Failed to spawn sidecar");

    tauri::Builder::default()
        .invoke_handler(tauri::generate_handler![greet])
        .invoke_handler(tauri::generate_handler![sparql_query])
        .run(tauri::generate_context!())
        .expect("error while running tauri application");
}

[FabianLars]

unrelated to the issue, but you can call invoke_handler only once. Subsequent calls will overwrite the ones before that, in your case it should look like this (even tho you probably don't need the greet function, but in case you'll add other commands later)

tauri::Builder::default()
        .invoke_handler(tauri::generate_handler![greet, sparql_query])
        ...

Where do I want to run the Command?

Probably in the setup hook, similar to this: https://github.com/tauri-apps/tauri/blob/dev/examples/sidecar/src-tauri/src/main.rs but what you're doing should work fine too yeah

[nikolaswise]

🙇 Thank you!