Function tauri::async_runtime::block_on
source · Expand description
Runs a future to completion on runtime.
Examples found in repository?
src/async_runtime.rs (line 301)
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pub(crate) fn safe_block_on<F>(task: F) -> F::Output
where
F: Future + Send + 'static,
F::Output: Send + 'static,
{
if let Ok(handle) = tokio::runtime::Handle::try_current() {
let (tx, rx) = std::sync::mpsc::sync_channel(1);
let handle_ = handle.clone();
handle.spawn_blocking(move || {
tx.send(handle_.block_on(task)).unwrap();
});
rx.recv().unwrap()
} else {
block_on(task)
}
}
More examples
src/api/process/command.rs (lines 293-302)
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pub fn spawn(self) -> crate::api::Result<(Receiver<CommandEvent>, CommandChild)> {
let encoding = self.encoding;
let mut command: StdCommand = self.into();
let (stdout_reader, stdout_writer) = pipe()?;
let (stderr_reader, stderr_writer) = pipe()?;
let (stdin_reader, stdin_writer) = pipe()?;
command.stdout(stdout_writer);
command.stderr(stderr_writer);
command.stdin(stdin_reader);
let shared_child = SharedChild::spawn(&mut command)?;
let child = Arc::new(shared_child);
let child_ = child.clone();
let guard = Arc::new(RwLock::new(()));
commands().lock().unwrap().insert(child.id(), child.clone());
let (tx, rx) = channel(1);
spawn_pipe_reader(
tx.clone(),
guard.clone(),
stdout_reader,
CommandEvent::Stdout,
encoding,
);
spawn_pipe_reader(
tx.clone(),
guard.clone(),
stderr_reader,
CommandEvent::Stderr,
encoding,
);
spawn(move || {
let _ = match child_.wait() {
Ok(status) => {
let _l = guard.write().unwrap();
commands().lock().unwrap().remove(&child_.id());
block_on_task(async move {
tx.send(CommandEvent::Terminated(TerminatedPayload {
code: status.code(),
#[cfg(windows)]
signal: None,
#[cfg(unix)]
signal: status.signal(),
}))
.await
})
}
Err(e) => {
let _l = guard.write().unwrap();
block_on_task(async move { tx.send(CommandEvent::Error(e.to_string())).await })
}
};
});
Ok((
rx,
CommandChild {
inner: child,
stdin_writer,
},
))
}
/// Executes a command as a child process, waiting for it to finish and collecting its exit status.
/// Stdin, stdout and stderr are ignored.
///
/// # Examples
/// ```rust,no_run
/// use tauri::api::process::Command;
/// let status = Command::new("which").args(["ls"]).status().unwrap();
/// println!("`which` finished with status: {:?}", status.code());
/// ```
pub fn status(self) -> crate::api::Result<ExitStatus> {
let (mut rx, _child) = self.spawn()?;
let code = crate::async_runtime::safe_block_on(async move {
let mut code = None;
#[allow(clippy::collapsible_match)]
while let Some(event) = rx.recv().await {
if let CommandEvent::Terminated(payload) = event {
code = payload.code;
}
}
code
});
Ok(ExitStatus { code })
}
/// Executes the command as a child process, waiting for it to finish and collecting all of its output.
/// Stdin is ignored.
///
/// # Examples
///
/// ```rust,no_run
/// use tauri::api::process::Command;
/// let output = Command::new("echo").args(["TAURI"]).output().unwrap();
/// assert!(output.status.success());
/// assert_eq!(output.stdout, "TAURI");
/// ```
pub fn output(self) -> crate::api::Result<Output> {
let (mut rx, _child) = self.spawn()?;
let output = crate::async_runtime::safe_block_on(async move {
let mut code = None;
let mut stdout = String::new();
let mut stderr = String::new();
while let Some(event) = rx.recv().await {
match event {
CommandEvent::Terminated(payload) => {
code = payload.code;
}
CommandEvent::Stdout(line) => {
stdout.push_str(line.as_str());
stdout.push('\n');
}
CommandEvent::Stderr(line) => {
stderr.push_str(line.as_str());
stderr.push('\n');
}
CommandEvent::Error(_) => {}
}
}
Output {
status: ExitStatus { code },
stdout,
stderr,
}
});
Ok(output)
}
}
fn spawn_pipe_reader<F: Fn(String) -> CommandEvent + Send + Copy + 'static>(
tx: Sender<CommandEvent>,
guard: Arc<RwLock<()>>,
pipe_reader: PipeReader,
wrapper: F,
character_encoding: Option<&'static Encoding>,
) {
spawn(move || {
let _lock = guard.read().unwrap();
let mut reader = BufReader::new(pipe_reader);
let mut buf = Vec::new();
loop {
buf.clear();
match tauri_utils::io::read_line(&mut reader, &mut buf) {
Ok(n) => {
if n == 0 {
break;
}
let tx_ = tx.clone();
let line = match character_encoding {
Some(encoding) => Ok(encoding.decode_with_bom_removal(&buf).0.into()),
None => String::from_utf8(buf.clone()),
};
block_on_task(async move {
let _ = match line {
Ok(line) => tx_.send(wrapper(line)).await,
Err(e) => tx_.send(CommandEvent::Error(e.to_string())).await,
};
});
}
Err(e) => {
let tx_ = tx.clone();
let _ = block_on_task(async move { tx_.send(CommandEvent::Error(e.to_string())).await });
}
}
}
});
}