虹膜-如何记录错误/异常？

Question

I'm testing a Go application using Iris. I want to log every error or exception to my Rollbar account.

For instance, if the endpoint takes too long to respond and there is a timeout, I want to log it. How can I capture errors like that?

Update

I found in the documentation the OnError method, and I thought I could use it like this:

iris.OnError(iris.StatusServiceUnavailable, func(c *iris.Context) {
    c.Write("503")
    params := string(c.RequestCtx.Request.Body())
    rollbar.Error("error", errors.New("503 Service Unavailable"), &rollbar.Field{Name: "request_body", Data: params})
})

But it is not logging the error to Rollbar.

Answer 1

You'll need to write your own iris middleware.

Should look something like this:

func irisMiddlewareFunc(ctx *iris.Context) {
    startedAt := time.Now()
    ctx.Next()
    timeTaken := time.Since(startedAt)

    // now check time taken and log as required
    if timeTaken.Seconds() > 2 {
        fmt.Println("Taken too long")
    }
}

The you use it like this:

    iris.UseFunc(irisMiddlewareFunc)

And if you need to handle panics as well, just use recover() as you would usually do to handle panics. See github.com/iris-contrib/middleware/recovery for an example.