/rust/registry/src/index.crates.io-1949cf8c6b5b557f/tracing-0.1.43/src/subscriber.rs

Source
//! Collects and records trace data.
pub use tracing_core::subscriber::*;

#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
pub use tracing_core::dispatcher::DefaultGuard;

/// Sets this [`Subscriber`] as the default for the current thread for the
/// duration of a closure.
///
/// The default subscriber is used when creating a new [`Span`] or
/// [`Event`].
///
///
/// [`Span`]: super::span::Span
/// [`Subscriber`]: super::subscriber::Subscriber
/// [`Event`]: super::event::Event
#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
pub fn with_default<T, S>(subscriber: S, f: impl FnOnce() -> T) -> T
where
    S: Subscriber + Send + Sync + 'static,
{
    crate::dispatcher::with_default(&crate::Dispatch::new(subscriber), f)
}

/// Sets this subscriber as the global default for the duration of the entire program.
/// Will be used as a fallback if no thread-local subscriber has been set in a thread (using `with_default`.)
///
/// Can only be set once; subsequent attempts to set the global default will fail.
/// Returns whether the initialization was successful.
///
/// Note: Libraries should *NOT* call `set_global_default()`! That will cause conflicts when
/// executables try to set them later.
///
/// [`Subscriber`]: super::subscriber::Subscriber
/// [`Event`]: super::event::Event
pub fn set_global_default<S>(subscriber: S) -> Result<(), SetGlobalDefaultError>
where
    S: Subscriber + Send + Sync + 'static,
{
    crate::dispatcher::set_global_default(crate::Dispatch::new(subscriber))
}

/// Sets the [`Subscriber`] as the default for the current thread for the
/// duration of the lifetime of the returned [`DefaultGuard`].
///
/// The default subscriber is used when creating a new [`Span`] or [`Event`].
///
/// [`Span`]: super::span::Span
/// [`Subscriber`]: super::subscriber::Subscriber
/// [`Event`]: super::event::Event
/// [`DefaultGuard`]: super::dispatcher::DefaultGuard
#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
#[must_use = "Dropping the guard unregisters the subscriber."]
pub fn set_default<S>(subscriber: S) -> DefaultGuard
where
    S: Subscriber + Send + Sync + 'static,
{
    crate::dispatcher::set_default(&crate::Dispatch::new(subscriber))
}

pub use tracing_core::dispatcher::SetGlobalDefaultError;

Coverage Report

Created: 2025-12-31 06:22

Line	Count	Source
1		//! Collects and records trace data.
2		pub use tracing_core::subscriber::*;
3
4		#[cfg(feature = "std")]
5		#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
6		pub use tracing_core::dispatcher::DefaultGuard;
7
8		/// Sets this [`Subscriber`] as the default for the current thread for the
9		/// duration of a closure.
10		///
11		/// The default subscriber is used when creating a new [`Span`] or
12		/// [`Event`].
13		///
14		///
15		/// [`Span`]: super::span::Span
16		/// [`Subscriber`]: super::subscriber::Subscriber
17		/// [`Event`]: super::event::Event
18		#[cfg(feature = "std")]
19		#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
20	0	pub fn with_default<T, S>(subscriber: S, f: impl FnOnce() -> T) -> T
21	0	where
22	0	S: Subscriber + Send + Sync + 'static,
23		{
24	0	crate::dispatcher::with_default(&crate::Dispatch::new(subscriber), f)
25	0	}
26
27		/// Sets this subscriber as the global default for the duration of the entire program.
28		/// Will be used as a fallback if no thread-local subscriber has been set in a thread (using `with_default`.)
29		///
30		/// Can only be set once; subsequent attempts to set the global default will fail.
31		/// Returns whether the initialization was successful.
32		///
33		/// Note: Libraries should NOT call `set_global_default()`! That will cause conflicts when
34		/// executables try to set them later.
35		///
36		/// [`Subscriber`]: super::subscriber::Subscriber
37		/// [`Event`]: super::event::Event
38	0	pub fn set_global_default<S>(subscriber: S) -> Result<(), SetGlobalDefaultError>
39	0	where
40	0	S: Subscriber + Send + Sync + 'static,
41		{
42	0	crate::dispatcher::set_global_default(crate::Dispatch::new(subscriber))
43	0	}
44
45		/// Sets the [`Subscriber`] as the default for the current thread for the
46		/// duration of the lifetime of the returned [`DefaultGuard`].
47		///
48		/// The default subscriber is used when creating a new [`Span`] or [`Event`].
49		///
50		/// [`Span`]: super::span::Span
51		/// [`Subscriber`]: super::subscriber::Subscriber
52		/// [`Event`]: super::event::Event
53		/// [`DefaultGuard`]: super::dispatcher::DefaultGuard
54		#[cfg(feature = "std")]
55		#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
56		#[must_use = "Dropping the guard unregisters the subscriber."]
57	0	pub fn set_default<S>(subscriber: S) -> DefaultGuard
58	0	where
59	0	S: Subscriber + Send + Sync + 'static,
60		{
61	0	crate::dispatcher::set_default(&crate::Dispatch::new(subscriber))
62	0	}
63
64		pub use tracing_core::dispatcher::SetGlobalDefaultError;