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logger: Check level before creating entry #771

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Dec 18, 2019
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logger: Check level before creating entry #771

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6 changes: 6 additions & 0 deletions logger.go
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Original file line number Diff line number Diff line change
Expand Up @@ -258,6 +258,12 @@ func (log *Logger) check(lvl zapcore.Level, msg string) *zapcore.CheckedEntry {
// (e.g., Check, Info, Fatal).
const callerSkipOffset = 2

// Check the level first to reduce the cost of disabled log calls.
// Since Panic and higher may exit, we skip the optimization for those levels.
if lvl < zapcore.DPanicLevel && !log.core.Enabled(lvl) {
return nil
}

// Create basic checked entry thru the core; this will be non-nil if the
// log message will actually be written somewhere.
ent := zapcore.Entry{
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