Logging All HTTP Request and Response from done through an HTTP Client

Question

I have the following simple http.Client :

import (
 "net/http"
 "log"
)
...
func main() {
   ...
   link = "http://example.com"
   method = "GET"
   req, _ := http.NewRequest(method, link, nil)

   client := &http.Client{}

   myZapLogger.Info("Sending a %s request to %s\n", method, link)

   resp, err := client.Do(req)
   if err != nil {
      myZapLogger.Error(..., err) // I'm logging rather than fatal-ing or so
   } else { 
      myZapLogger.Info("Received a %d on request X", resp.StatusCode)
   }
   ...
}

...

I was looking for a way to do the above for each request through a hook (or so), so that it's triggered automatically each time. I can write a function the encloses all that, but in a case where I'm passing an http client to some other package, I wouldn't be able to control/log such requests that way (eg aws-go-sdk ).

Is there a way to do this through contexts or attaching hooks to the client?

Thanks

Answer 1

eudore 's comment answers the question; I'll just put it into code:

type MyRoundTripper struct {}

func (t MyRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
    
    // Do work before the request is sent

    resp, err := http.DefaultTransport.RoundTrip(req)
    if err != nil {
        return resp, err
    }
    
    // Do work after the response is received

    return resp, err
}

To use it, you'll just pass it to your HTTP Client:

rt := MyRoundTripper{}
client := http.Client{Transport: rt}