how to get a logger context value

[BigBoulard]

Hi,

I'm not really confortable with context, but here's the thing... I've created a middleware that is used by a gin server and that sets a correlation ID in the logger context.

package log

var l *logger

type logger struct {
    logger zerolog.Logger
}
...
const correlationHeader = "Correlation-ID"
const correlationContextKey = "correlation_id"
...
func Middleware() gin.HandlerFunc {
    return func(c *gin.Context) {
        // creates a correlation_id in the request header if not present
        correlationID := c.Request.Header.Get(correlationHeader)
        if correlationID == "" {
            correlationID = xid.New().String()
            c.Request.Header.Add(CorrelationHeader, correlationID)
        }
        // add correlationID to the logger context
        l.logger.UpdateContext(func(c zerolog.Context) zerolog.Context {
            return c.Str(correlationContextKey, correlationID)
        })
    }
}

if I want to get the correlation ID from the request, I can do something like c.Request.Header.Get(CorrelationHeader) (c being *gin.Context).

But if I don't have access to c.Request but just the logger instance, how can I access the correlation ID value from the logger context?

package log

var l *logger

type logger struct {
    logger zerolog.Logger
}

func Error(err error, msg string) {
    l.logger.Error().
        Err(err).
        Str(correlationContextKey, l.logger.XXXXXXXXXX ). // ??????
        Msg(msg)
}

Thank you so much.