Enum LogFormat 

pub enum LogFormat {
    Json,
    LogFmt,
    Terminal,
}

Available on crate feature std only.

Represents the logging format.

This enum defines the supported formats for logging output. It is used to configure the format layer of a tracing subscriber.

Variants

Json

Represents JSON formatting for logs. This format outputs log records as JSON objects, making it suitable for structured logging.

LogFmt

Represents logfmt (key=value) formatting for logs. This format is concise and human-readable, typically used in command-line applications.

Terminal

Represents terminal-friendly formatting for logs.

Implementations

impl LogFormat

pub fn apply<F>( &self, filter: F, color: Option<String>, show_target: bool, file_writer: Option<NonBlocking>, ) -> Box<dyn Layer<Registry> + Send + Sync>

where F: Filter<Registry> + Send + Sync + 'static,

Applies the specified logging format to create a new layer.

Arguments

• filter - A filter layer (either EnvFilter or a reload::Layer wrapping one).
• color - An optional string that enables or disables ANSI color codes in the logs.
• show_target - Whether to show the target module path in log output.
• file_writer - An optional [NonBlocking] writer for directing logs to a file. When None, logs are written to stdout.

Returns

A BoxedLayer<Registry> that can be added to a tracing subscriber.

Environment

• RUST_LOG_THREAD_IDS - Set to any value other than 0 to include the emitting thread’s ID in log output. Thread IDs are omitted when it is unset. JSON and terminal output show the Rust std::thread::ThreadId, while logfmt output shows the OS thread ID.

Trait Implementations

impl Clone for LogFormat

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for LogFormat

impl Debug for LogFormat

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for LogFormat

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for LogFormat

impl PartialEq for LogFormat

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for LogFormat

impl ValueEnum for LogFormat

fn value_variants<'a>() -> &'a [Self]

All possible argument values, in display order.

fn to_possible_value<'a>(&self) -> Option<PossibleValue>

The canonical argument value.

fn from_str(input: &str, ignore_case: bool) -> Result<Self, String>

Parse an argument into Self.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte

Size for each variant:

• Json: 0 bytes
• LogFmt: 0 bytes
• Terminal: 0 bytes