1 files changed, 19 insertions, 1 deletions
diff --git a/drive/errors.go b/drive/errors.go
index e7631f7..f70f0f0 100644
--- a/drive/errors.go
+++ b/drive/errors.go
@@ -1,11 +1,16 @@
 package drive
 
 import (
+	"golang.org/x/net/context"
 	"google.golang.org/api/googleapi"
 	"time"
 )
 
-const MaxBackendErrorRetries = 5
+const MaxErrorRetries = 5
+
+func isBackendOrRateLimitError(err error) bool {
+	return isBackendError(err) || isRateLimitError(err)
+}
 
 func isBackendError(err error) bool {
 	if err == nil {
@@ -16,6 +21,19 @@ func isBackendError(err error) bool {
 	return ok && ae.Code >= 500 && ae.Code <= 599
 }
 
+func isRateLimitError(err error) bool {
+	if err == nil {
+		return false
+	}
+
+	ae, ok := err.(*googleapi.Error)
+	return ok && ae.Code == 403
+}
+
+func isTimeoutError(err error) bool {
+	return err == context.Canceled
+}
+
 func exponentialBackoffSleep(try int) {
 	seconds := pow(2, try)
 	time.Sleep(time.Duration(seconds) * time.Second)