Fix leaking sockets by removing the deferred Close() (closes #34)

spot.go

@@ -35,19 +35,21 @@ func pollSpotTermination(ctx context.Context) chan time.Time {
 					log.WithError(err).Info("Failed to query metadata service")
 					continue
 				}
-				defer res.Body.Close()
-
-				// will return 200 OK with termination notice
-				if res.StatusCode != http.StatusOK {
-					continue
-				}
 
+				// We read the body immediately so that we can close the body in one place
+				// and still use 'continue' if any of our conditions are false.
 				body, err := ioutil.ReadAll(res.Body)
+				res.Body.Close()
 				if err != nil {
 					log.WithError(err).Info("Failed to read response from metadata service")
 					continue
 				}
 
+				// will return 200 OK with termination notice
+				if res.StatusCode != http.StatusOK {
+					continue
+				}
+
 				// if 200 OK, expect a body like 2015-01-05T18:02:00Z
 				t, err := time.Parse(terminationTimeFormat, string(body))
 				if err != nil {