Struct StandardMessageFormatter 

pub struct StandardMessageFormatter {}

A high-performance, stateful formatter that produces RFC 3339 compliant logs.

Output Format

The formatter produces a single line per message using the following pattern: [Timestamp] [ [Level] ] [Message]

• Timestamp: Generated in UTC using RFC 3339 format with nanosecond precision (e.g., 2026-03-14T14:48:02.609225083+00:00).
• Level: The log level is uppercase, padded with single spaces inside brackets (e.g., [ DEBUG ], [ INFO ], [ ERROR ]).
• Message: The raw message content followed by a newline (\n).

Example Output

2026-03-14T15:30:00.123456789+00:00 [ INFO  ] Service started successfully
2026-03-14T15:30:05.000000000+00:00 [ DEBUG ] Connecting to Loki at localhost:3100

Implementations

impl StandardMessageFormatter

pub fn new() -> Self

Creates a formatter with a default buffer capacity of 128 bytes.

Trait Implementations

impl Default for StandardMessageFormatter

fn default() -> StandardMessageFormatter

Returns the “default value” for a type.

impl MessageFormatter for StandardMessageFormatter

fn format_io( &mut self, message: &Message, write: &mut (dyn Write + Send + Sync), ) -> Result<(), ServiceError>

Formats and writes the message to the provided I/O sink.

fn format_fmt( &mut self, message: &Message, write: &mut (dyn Write + Send + Sync), ) -> Result<(), ServiceError>

Formats a message specifically for fmt-based destinations.