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https://github.com/nushell/nushell.git
synced 2024-11-25 09:53:43 +01:00
Name threads (#7879)
I noticed that [it's pretty easy to name threads in Rust](https://doc.rust-lang.org/std/thread/#naming-threads). We might as well do this; it's a nice quality of life improvement when you're profiling something and the developers took the time to give threads names. Also added/cleaned up some comments while I was in the area.
This commit is contained in:
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e616b2e247
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f4d7d19370
@ -130,16 +130,21 @@ impl Command for Do {
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// So we need a thread to receive stdout message, then the current thread can continue to consume
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// stderr messages.
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let stdout_handler = stdout.map(|stdout_stream| {
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thread::spawn(move || {
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let ctrlc = stdout_stream.ctrlc.clone();
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let span = stdout_stream.span;
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RawStream::new(
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Box::new(vec![stdout_stream.into_bytes().map(|s| s.item)].into_iter()),
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ctrlc,
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span,
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None,
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)
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})
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thread::Builder::new()
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.name("stderr redirector".to_string())
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.spawn(move || {
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let ctrlc = stdout_stream.ctrlc.clone();
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let span = stdout_stream.span;
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RawStream::new(
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Box::new(
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vec![stdout_stream.into_bytes().map(|s| s.item)].into_iter(),
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),
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ctrlc,
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span,
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None,
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)
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})
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.expect("Failed to create thread")
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});
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// Intercept stderr so we can return it in the error if the exit code is non-zero.
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@ -8,6 +8,7 @@ use nu_protocol::{
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use std::fs::File;
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use std::io::{BufWriter, Write};
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use std::path::Path;
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use std::thread;
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use crate::progress_bar;
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@ -85,13 +86,17 @@ impl Command for Save {
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// delegate a thread to redirect stderr to result.
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let handler = stderr.map(|stderr_stream| match stderr_file {
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Some(stderr_file) => std::thread::spawn(move || {
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stream_to_file(stderr_stream, stderr_file, span, progress)
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}),
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None => std::thread::spawn(move || {
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let _ = stderr_stream.into_bytes();
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Ok(PipelineData::empty())
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}),
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Some(stderr_file) => thread::Builder::new()
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.name("stderr redirector".to_string())
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.spawn(move || stream_to_file(stderr_stream, stderr_file, span, progress))
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.expect("Failed to create thread"),
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None => thread::Builder::new()
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.name("stderr redirector".to_string())
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.spawn(move || {
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let _ = stderr_stream.into_bytes();
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Ok(PipelineData::empty())
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})
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.expect("Failed to create thread"),
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});
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let res = stream_to_file(stream, file, span, progress);
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@ -4,6 +4,8 @@ use nu_protocol::{
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Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, Type, Value,
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};
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use std::thread;
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#[derive(Clone)]
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pub struct Complete;
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@ -50,20 +52,23 @@ impl Command for Complete {
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let stderr_handler = stderr.map(|stderr| {
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let stderr_span = stderr.span;
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(
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std::thread::spawn(move || {
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let stderr = stderr.into_bytes()?;
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if let Ok(st) = String::from_utf8(stderr.item.clone()) {
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Ok::<_, ShellError>(Value::String {
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val: st,
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span: stderr.span,
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})
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} else {
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Ok::<_, ShellError>(Value::Binary {
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val: stderr.item,
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span: stderr.span,
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})
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}
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}),
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thread::Builder::new()
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.name("stderr consumer".to_string())
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.spawn(move || {
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let stderr = stderr.into_bytes()?;
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if let Ok(st) = String::from_utf8(stderr.item.clone()) {
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Ok::<_, ShellError>(Value::String {
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val: st,
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span: stderr.span,
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})
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} else {
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Ok::<_, ShellError>(Value::Binary {
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val: stderr.item,
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span: stderr.span,
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})
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}
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})
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.expect("failed to create thread"),
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stderr_span,
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)
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});
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@ -18,6 +18,7 @@ use std::process::{Command as CommandSys, Stdio};
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use std::sync::atomic::AtomicBool;
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use std::sync::mpsc::{self, SyncSender};
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use std::sync::Arc;
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use std::thread;
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const OUTPUT_BUFFER_SIZE: usize = 1024;
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const OUTPUT_BUFFERS_IN_FLIGHT: usize = 3;
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@ -347,32 +348,41 @@ impl ExternalCommand {
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// Turn off color as we pass data through
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engine_state.config.use_ansi_coloring = false;
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// if there is a string or a stream, that is sent to the pipe std
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// Pipe input into the external command's stdin
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if let Some(mut stdin_write) = child.as_mut().stdin.take() {
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std::thread::spawn(move || {
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let input = crate::Table::run(
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&crate::Table,
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&engine_state,
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&mut stack,
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&Call::new(head),
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input,
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);
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thread::Builder::new()
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.name("external stdin worker".to_string())
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.spawn(move || {
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// Attempt to render the input as a table before piping it to the external.
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// This is important for pagers like `less`;
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// they need to get Nu data rendered for display to users.
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//
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// TODO: should we do something different for list<string> inputs?
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// Users often expect those to be piped to *nix tools as raw strings separated by newlines
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let input = crate::Table::run(
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&crate::Table,
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&engine_state,
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&mut stack,
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&Call::new(head),
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input,
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);
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if let Ok(input) = input {
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for value in input.into_iter() {
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let buf = match value {
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Value::String { val, .. } => val.into_bytes(),
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Value::Binary { val, .. } => val,
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_ => return Err(()),
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};
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if stdin_write.write(&buf).is_err() {
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return Ok(());
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if let Ok(input) = input {
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for value in input.into_iter() {
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let buf = match value {
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Value::String { val, .. } => val.into_bytes(),
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Value::Binary { val, .. } => val,
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_ => return Err(()),
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};
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if stdin_write.write(&buf).is_err() {
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return Ok(());
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}
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}
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}
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}
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Ok(())
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});
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Ok(())
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})
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.expect("Failed to create thread");
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}
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}
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@ -388,24 +398,26 @@ impl ExternalCommand {
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let stdout = child.as_mut().stdout.take();
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let stderr = child.as_mut().stderr.take();
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// If this external is not the last expression, then its output is piped to a channel
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// and we create a ListStream that can be consumed
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//
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// Create two threads: one for redirect stdout message, and wait for child process to complete.
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// The other may be created when we want to redirect stderr message.
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std::thread::spawn(move || {
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if redirect_stdout {
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let stdout = stdout.ok_or_else(|| {
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ShellError::ExternalCommand(
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"Error taking stdout from external".to_string(),
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"Redirects need access to stdout of an external command"
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.to_string(),
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span,
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)
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})?;
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read_and_redirect_message(stdout, stdout_tx, ctrlc)
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}
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// First create a thread to redirect the external's stdout and wait for an exit code.
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thread::Builder::new()
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.name("stdout redirector + exit code waiter".to_string())
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.spawn(move || {
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if redirect_stdout {
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let stdout = stdout.ok_or_else(|| {
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ShellError::ExternalCommand(
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"Error taking stdout from external".to_string(),
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"Redirects need access to stdout of an external command"
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.to_string(),
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span,
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)
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})?;
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read_and_redirect_message(stdout, stdout_tx, ctrlc)
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}
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match child.as_mut().wait() {
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Err(err) => Err(ShellError::ExternalCommand(
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@ -462,23 +474,26 @@ impl ExternalCommand {
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Ok(())
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}
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}
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});
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}).expect("Failed to create thread");
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let (stderr_tx, stderr_rx) = mpsc::sync_channel(OUTPUT_BUFFERS_IN_FLIGHT);
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if redirect_stderr {
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std::thread::spawn(move || {
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let stderr = stderr.ok_or_else(|| {
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ShellError::ExternalCommand(
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"Error taking stderr from external".to_string(),
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"Redirects need access to stderr of an external command"
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.to_string(),
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span,
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)
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})?;
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thread::Builder::new()
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.name("stderr redirector".to_string())
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.spawn(move || {
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let stderr = stderr.ok_or_else(|| {
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ShellError::ExternalCommand(
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"Error taking stderr from external".to_string(),
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"Redirects need access to stderr of an external command"
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.to_string(),
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span,
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)
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})?;
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read_and_redirect_message(stderr, stderr_tx, stderr_ctrlc);
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Ok::<(), ShellError>(())
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});
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read_and_redirect_message(stderr, stderr_tx, stderr_ctrlc);
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Ok::<(), ShellError>(())
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})
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.expect("Failed to create thread");
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}
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let stdout_receiver = ChannelReceiver::new(stdout_rx);
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@ -5,6 +5,7 @@ use crate::{
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};
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use nu_utils::{stderr_write_all_and_flush, stdout_write_all_and_flush};
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use std::sync::{atomic::AtomicBool, Arc};
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use std::thread;
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const LINE_ENDING_PATTERN: &[char] = &['\r', '\n'];
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@ -726,8 +727,11 @@ pub fn print_if_stream(
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exit_code: Option<ListStream>,
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) -> Result<i64, ShellError> {
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// NOTE: currently we don't need anything from stderr
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// so directly consumes `stderr_stream` to make sure that everything is done.
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std::thread::spawn(move || stderr_stream.map(|x| x.into_bytes()));
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// so we just consume and throw away `stderr_stream` to make sure the pipe doesn't fill up
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thread::Builder::new()
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.name("stderr consumer".to_string())
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.spawn(move || stderr_stream.map(|x| x.into_bytes()))
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.expect("could not create thread");
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if let Some(stream) = stream {
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for s in stream {
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let s_live = s?;
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