Golang logging http responses (in addition to requests)

Question

I am using Go and the Gorilla web toolkit\'s mux and handler packages to build a complex application, part of which requires a http server. Gorilla\'s mux and handler packa

Answer 1

edit sorry, I didn't notice your mention of gorilla-mux, I have only tried this with gin, but if it uses middlewares this should still work.

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the trick is, c.Next() in a middleware blocks until all subsequent middlewares return. Here's a logrus solution. Put this as your first middleware:

func Logrus(logger *logrus.Logger) gin.HandlerFunc {
    return func(c *gin.Context) {
        start := time.Now().UTC()
        path := c.Request.URL.Path
        c.Next()
        end := time.Now().UTC()
        latency := end.Sub(start)
        logger.WithFields(logrus.Fields{
            "status":     c.Writer.Status(),
            "method":     c.Request.Method,
            "path":       path,
            "ip":         c.ClientIP(),
            "duration":   latency,
            "user_agent": c.Request.UserAgent(),
        }).Info()
    }
}
GinEngine.Use(Logrus(logrus.StandardLogger()))