Added request callback

lib/client.go

@@ -56,8 +56,14 @@ type Client struct {
 
 	// Throttling struct
 	bucket *ratelimit.Bucket
+
+	// Optional function called after every successful request made to the API
+	onRequestCompleted RequestCompletionCallback
 }
 
+// RequestCompletionCallback defines the type of the request callback function
+type RequestCompletionCallback func(*http.Request, *http.Response)
+
 // Options represents optional settings and flags that can be passed to NewClient
 type Options struct {
 	// HTTP client for communication with the Vultr API
@@ -143,6 +149,11 @@ func (c *Client) post(path string, values url.Values, data interface{}) error {
 	return c.do(req, data)
 }
 
+// OnRequestCompleted sets the API request completion callback
+func (c *Client) OnRequestCompleted(rc RequestCompletionCallback) {
+	c.onRequestCompleted = rc
+}
+
 func (c *Client) newRequest(method string, path string, body io.Reader) (*http.Request, error) {
 	relPath, err := url.Parse(apiKeyPath(path, c.APIKey))
 	if err != nil {
@@ -193,6 +204,10 @@ func (c *Client) do(req *http.Request, data interface{}) error {
 			return err
 		}
 
+		if c.onRequestCompleted != nil {
+			c.onRequestCompleted(req, resp)
+		}
+
 		body, err := ioutil.ReadAll(resp.Body)
 		resp.Body.Close()
 		if err != nil {