macro_rules! event { (name: $name:expr, target: $target:expr, parent: $parent:expr, $lvl:expr, { $($fields:tt)* } ) => { ... }; (name: $name:expr, target: $target:expr, parent: $parent:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... }; (name: $name:expr, target: $target:expr, parent: $parent:expr, $lvl:expr, $($k:ident).+ = $($fields:tt)* ) => { ... }; (name: $name:expr, target: $target:expr, parent: $parent:expr, $lvl:expr, $($arg:tt)+) => { ... }; (name: $name:expr, target: $target:expr, $lvl:expr, { $($fields:tt)* } ) => { ... }; (name: $name:expr, target: $target:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... }; (name: $name:expr, target: $target:expr, $lvl:expr, $($k:ident).+ = $($fields:tt)* ) => { ... }; (name: $name:expr, target: $target:expr, $lvl:expr, $($arg:tt)+) => { ... }; (target: $target:expr, parent: $parent:expr, $lvl:expr, { $($fields:tt)* } ) => { ... }; (target: $target:expr, parent: $parent:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... }; (target: $target:expr, parent: $parent:expr, $lvl:expr, $($k:ident).+ = $($fields:tt)* ) => { ... }; (target: $target:expr, parent: $parent:expr, $lvl:expr, $($arg:tt)+) => { ... }; (name: $name:expr, parent: $parent:expr, $lvl:expr, { $($fields:tt)* } ) => { ... }; (name: $name:expr, parent: $parent:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... }; (name: $name:expr, parent: $parent:expr, $lvl:expr, $($k:ident).+ = $($fields:tt)* ) => { ... }; (name: $name:expr, parent: $parent:expr, $lvl:expr, $($arg:tt)+) => { ... }; (name: $name:expr, $lvl:expr, { $($fields:tt)* } ) => { ... }; (name: $name:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... }; (name: $name:expr, $lvl:expr, $($k:ident).+ = $($fields:tt)* ) => { ... }; (name: $name:expr, $lvl:expr, $($arg:tt)+ ) => { ... }; (target: $target:expr, $lvl:expr, { $($fields:tt)* } ) => { ... }; (target: $target:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... }; (target: $target:expr, $lvl:expr, $($k:ident).+ = $($fields:tt)* ) => { ... }; (target: $target:expr, $lvl:expr, $($arg:tt)+ ) => { ... }; (parent: $parent:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... }; (parent: $parent:expr, $lvl:expr, $($k:ident).+ = $($field:tt)*) => { ... }; (parent: $parent:expr, $lvl:expr, ?$($k:ident).+ = $($field:tt)*) => { ... }; (parent: $parent:expr, $lvl:expr, %$($k:ident).+ = $($field:tt)*) => { ... }; (parent: $parent:expr, $lvl:expr, $($k:ident).+, $($field:tt)*) => { ... }; (parent: $parent:expr, $lvl:expr, %$($k:ident).+, $($field:tt)*) => { ... }; (parent: $parent:expr, $lvl:expr, ?$($k:ident).+, $($field:tt)*) => { ... }; (parent: $parent:expr, $lvl:expr, $($arg:tt)+ ) => { ... }; ( $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... }; ($lvl:expr, $($k:ident).+ = $($field:tt)*) => { ... }; ($lvl:expr, $($k:ident).+, $($field:tt)*) => { ... }; ($lvl:expr, ?$($k:ident).+, $($field:tt)*) => { ... }; ($lvl:expr, %$($k:ident).+, $($field:tt)*) => { ... }; ($lvl:expr, ?$($k:ident).+) => { ... }; ($lvl:expr, %$($k:ident).+) => { ... }; ($lvl:expr, $($k:ident).+) => { ... }; ( $lvl:expr, $($arg:tt)+ ) => { ... }; }
Expand description
Constructs a new Event.
The event macro is invoked with a Level and up to 32 key-value fields.
Optionally, a format string and arguments may follow the fields; this will
be used to construct an implicit field named “message”.
See the top-level documentation for details on the syntax accepted by this macro.
§Examples
use tracing::{event, Level};
let data = (42, "forty-two");
let private_data = "private";
let error = "a bad error";
event!(Level::ERROR, %error, "Received error");
event!(
target: "app_events",
Level::WARN,
private_data,
?data,
"App warning: {}",
error
);
event!(name: "answer", Level::INFO, the_answer = data.0);
event!(Level::INFO, the_answer = data.0);