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47 lines
1.5 KiB
Rust
47 lines
1.5 KiB
Rust
//! Custom log formatter that includes source file and line for WARN/ERROR events.
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use std::fmt;
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use tracing::{Event, Level, Subscriber};
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use tracing_subscriber::fmt::format::{self, FormatEvent, FormatFields};
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use tracing_subscriber::fmt::FmtContext;
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use tracing_subscriber::registry::LookupSpan;
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/// Event formatter that appends `[file:line]` to WARN and ERROR log lines.
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///
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/// INFO, DEBUG, and TRACE events use the default format without source location.
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pub struct ErrorLocationFormat;
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impl<S, N> FormatEvent<S, N> for ErrorLocationFormat
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where
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S: Subscriber + for<'a> LookupSpan<'a>,
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N: for<'a> FormatFields<'a> + 'static,
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{
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fn format_event(
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&self,
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ctx: &FmtContext<'_, S, N>,
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mut writer: format::Writer<'_>,
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event: &Event<'_>,
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) -> fmt::Result {
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let metadata = event.metadata();
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let level = metadata.level();
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let timestamp = chrono::Utc::now().format("%Y-%m-%dT%H:%M:%S%.6fZ");
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// Write: timestamp + level + target
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write!(writer, "{} {:>5} {}", timestamp, level, metadata.target())?;
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// Append [file:line] for WARN and ERROR only
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if *level <= Level::WARN {
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if let (Some(file), Some(line)) = (metadata.file(), metadata.line()) {
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write!(writer, " [{}:{}]", file, line)?;
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}
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}
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write!(writer, ": ")?;
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// Write the event fields (message, structured fields)
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ctx.format_fields(writer.by_ref(), event)?;
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writeln!(writer)
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}
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}
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