Method check

logger.go:322–422

(lvl zapcore.Level, msg string)

}

func (log *Logger) check(lvl zapcore.Level, msg string) *zapcore.CheckedEntry {
	// Logger.check must always be called directly by a method in the
	// Logger interface (e.g., Check, Info, Fatal).
	// This skips Logger.check and the Info/Fatal/Check/etc. method that
	// called it.
	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{
		LoggerName: log.name,
		Time:       log.clock.Now(),
		Level:      lvl,
		Message:    msg,
	}
	ce := log.core.Check(ent, nil)
	willWrite := ce != nil

	// Set up any required terminal behavior.
	switch ent.Level {
	case zapcore.PanicLevel:
		ce = ce.After(ent, terminalHookOverride(zapcore.WriteThenPanic, log.onPanic))
	case zapcore.FatalLevel:
		ce = ce.After(ent, terminalHookOverride(zapcore.WriteThenFatal, log.onFatal))
	case zapcore.DPanicLevel:
		if log.development {
			ce = ce.After(ent, terminalHookOverride(zapcore.WriteThenPanic, log.onPanic))
		}
	}

	// Only do further annotation if we're going to write this message; checked
	// entries that exist only for terminal behavior don't benefit from
	// annotation.
	if !willWrite {
		return ce
	}

	// Thread the error output through to the CheckedEntry.
	ce.ErrorOutput = log.errorOutput

	addStack := log.addStack.Enabled(ce.Level)
	if !log.addCaller && !addStack {
		return ce
	}

	// Adding the caller or stack trace requires capturing the callers of
	// this function. We'll share information between these two.
	stackDepth := stacktrace.First
	if addStack {
		stackDepth = stacktrace.Full
	}
	stack := stacktrace.Capture(log.callerSkip+callerSkipOffset, stackDepth)