env_filter/
filtered_log.rs

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1use log::Log;
2
3use crate::Filter;
4
5/// Decorate a [`log::Log`] with record [`Filter`]ing.
6///
7/// Records that match the filter will be forwarded to the wrapped log.
8/// Other records will be ignored.
9#[derive(Debug)]
10pub struct FilteredLog<T> {
11    log: T,
12    filter: Filter,
13}
14
15impl<T: Log> FilteredLog<T> {
16    /// Create a new filtered log.
17    pub fn new(log: T, filter: Filter) -> Self {
18        Self { log, filter }
19    }
20}
21
22impl<T: Log> Log for FilteredLog<T> {
23    /// Determines if a log message with the specified metadata would be logged.
24    ///
25    /// For the wrapped log, this returns `true` only if both the filter and the wrapped log return `true`.
26    fn enabled(&self, metadata: &log::Metadata<'_>) -> bool {
27        self.filter.enabled(metadata) && self.log.enabled(metadata)
28    }
29
30    /// Logs the record.
31    ///
32    /// Forwards the record to the wrapped log, but only if the record matches the filter.
33    fn log(&self, record: &log::Record<'_>) {
34        if self.filter.matches(record) {
35            self.log.log(record);
36        }
37    }
38
39    /// Flushes any buffered records.
40    ///
41    /// Forwards directly to the wrapped log.
42    fn flush(&self) {
43        self.log.flush();
44    }
45}
env_filter/filtered_log.rs

env_filter/
filtered_log.rs
