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feat: add TargetFilter::level_for_not #47

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merged 3 commits into from
Aug 14, 2024
Merged

feat: add TargetFilter::level_for_not #47

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e8c9b93
feat: add TargetFilter::level_for_not
andylokandy Aug 14, 2024
ee91023
fix
andylokandy Aug 14, 2024
765e9e8
Merge branch 'main' into dev3
andylokandy Aug 14, 2024
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20 changes: 16 additions & 4 deletions src/filter/target.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -21,25 +21,37 @@ use crate::filter::FilterResult;

/// A filter that checks if the log level is higher than the specified level for a specific
/// target.
///
/// Only if the target has a prefix that matches the target of the log record, the filter
/// will be applied.
#[derive(Debug, Clone)]
pub struct TargetFilter {
target: Cow<'static, str>,
level: log::LevelFilter,
not: bool,
}

impl TargetFilter {
/// The filter will be applied only if the target **has** a prefix that matches the target of
/// the log record.
pub fn level_for(target: impl Into<Cow<'static, str>>, level: log::LevelFilter) -> Self {
TargetFilter {
target: target.into(),
level,
not: false,
}
}

/// The filter will be applied only if the target **does not have** a prefix that matches the
/// target of the log record,
pub fn level_for_not(target: impl Into<Cow<'static, str>>, level: log::LevelFilter) -> Self {
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Read challenging. IIRC it could be generally neg_level_for or negtive_level_for?

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It's not negative on level but negative on for. So I'd like to put not word after for.

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@andylokandy andylokandy Aug 14, 2024 •
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Maybe level_excluding, level_for_excluding?

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@andylokandy andylokandy Aug 14, 2024 •
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In practice, it is like:

let dispatch = Dispatch::new()
    // discard other targets
    .filter(TargetFilter::level_for_not(
        "databend::log::structlog",
        LevelFilter::Off,
    ))
    .append(structlog_log_file);
logger = logger.dispatch(dispatch);

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@tisonkun tisonkun Aug 14, 2024 •
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I'd prefer to:

pub fn negative(mut self, negative: bool) -> Self {
  self.negative = negative;
  self
}

Maybe name it not, I'm OK with it. But the pattern is to invert the matching result manually in a fluent method. What do you think?

TargetFilter {
target: target.into(),
level,
not: true,
}
}

pub(crate) fn filter(&self, metadata: &Metadata) -> FilterResult {
if metadata.target().starts_with(self.target.as_ref()) {
let mathced = metadata.target().starts_with(self.target.as_ref());
if (mathced && !self.not) || (!mathced && self.not) {
let level = metadata.level();
if level <= self.level {
FilterResult::Neutral
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