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Evaluate message formatting only once while formatting the log #22

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Evaluate message formatting only once while formatting the log #22

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9 changes: 8 additions & 1 deletion v2/slogger/logger.go
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,10 @@ type Log struct {
MessageFmt string
Args []interface{}
Context *Context

// Appendages to evaluate a message only once
message string
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What is the lifecycle of a Log struct? We've now ~doubled the effective size of it, assuming MessageFmt (and now message) is long compared to the other fields...

evalMsgOnce sync.Once
}

func SimpleLog(prefix string, level Level, errorCode ErrorCode, callerSkip int, messageFmt string, args ...interface{}) *Log {
Expand Down Expand Up @@ -101,7 +105,10 @@ func getTruncatedMessage(old string) string {
}

func (self *Log) Message() string {
return getTruncatedMessage(fmt.Sprintf(self.MessageFmt, self.Args...))
self.evalMsgOnce.Do(func() {
self.message = getTruncatedMessage(fmt.Sprintf(self.MessageFmt, self.Args...))
})
return self.message
}

type Logger struct {
Expand Down