Struct ChromeLayerBuilder

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pub struct ChromeLayerBuilder<S>where
    S: Subscriber + for<'span> LookupSpan<'span> + Send + Sync,
{ /* private fields */ }

Expand description

A builder for ChromeLayer.

Implementations§

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impl<S> ChromeLayerBuilder<S>
where S: Subscriber + for<'span> LookupSpan<'span> + Send + Sync,

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pub fn new() -> Self

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pub fn file<P: AsRef<Path>>(self, file: P) -> Self

Set the file to which to output the trace.

Defaults to ./trace-{unix epoch in micros}.json.

§Panics

If file could not be opened/created. To handle errors, open a file and pass it to writer instead.

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pub fn writer<W: Write + Send + 'static>(self, writer: W) -> Self

Supply an arbitrary writer to which to write trace contents.

§Examples

let (layer, guard) = ChromeLayerBuilder::new().writer(std::io::sink()).build();

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pub fn include_args(self, include: bool) -> Self

Include arguments in each trace entry.

Defaults to false.

Includes the arguments used when creating a span/event in the “args” section of the trace entry.

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pub fn include_locations(self, include: bool) -> Self

Include file+line with each trace entry.

Defaults to true.

This can add quite a bit of data to the output so turning it off might be helpful when collecting larger traces.

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pub fn trace_style(self, style: TraceStyle) -> Self

Sets the style used when recording trace events.

See TraceStyle for details.

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pub fn name_fn( self, name_fn: Box<dyn Fn(&EventOrSpan<'_, '_, S>) -> String + Send + Sync>, ) -> Self

Allows supplying a function that derives a name from an Event or Span. The result is used as the “name” field on trace entries.

§Example

use tracing_chrome::{ChromeLayerBuilder, EventOrSpan};
use tracing_subscriber::{registry::Registry, prelude::*};

let (chrome_layer, _guard) = ChromeLayerBuilder::new().name_fn(Box::new(|event_or_span| {
    match event_or_span {
        EventOrSpan::Event(ev) => { ev.metadata().name().into() },
        EventOrSpan::Span(_s) => { "span".into() },
    }
})).build();
tracing_subscriber::registry().with(chrome_layer).init()

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pub fn category_fn( self, cat_fn: Box<dyn Fn(&EventOrSpan<'_, '_, S>) -> String + Send + Sync>, ) -> Self

Allows supplying a function that derives a category from an Event or Span. The result is used as the “cat” field on trace entries.

§Example

use tracing_chrome::{ChromeLayerBuilder, EventOrSpan};
use tracing_subscriber::{registry::Registry, prelude::*};

let (chrome_layer, _guard) = ChromeLayerBuilder::new().category_fn(Box::new(|_| {
    "my_module".into()
})).build();
tracing_subscriber::registry().with(chrome_layer).init()

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