add FromError func

Signed-off-by: Cassandra Coyle <[email protected]>

errors/errors.go

@@ -113,6 +113,20 @@ func (e *Error) AddDetails(details ...proto.Message) *Error {
 	return e
 }
 
+// FromError takes in an error and returns back the kitError if it's that type under the hood
+func FromError(err error) (*Error, bool) {
+	if err == nil {
+		return nil, false
+	}
+
+	kitErr, ok := err.(Error)
+	if ok {
+		return &kitErr, ok
+	}
+
+	return nil, false
+}
+
 /*** GRPC Methods ***/
 
 // GRPCStatus returns the gRPC status.Status object.

errors/errors_test.go

@@ -942,3 +942,29 @@ func containsType(types []string, target string) bool {
 	}
 	return false
 }
+
+func TestFromError(t *testing.T) {
+	result, ok := FromError(nil)
+	if result != nil || ok {
+		t.Errorf("Expected result to be nil and ok to be false, got result: %v, ok: %t", result, ok)
+	}
+
+	kitErr := Error{
+		grpcCode: grpcCodes.ResourceExhausted,
+		httpCode: http.StatusTeapot,
+		message:  "fake_message",
+		tag:      "DAPR_FAKE_TAG",
+		details:  []proto.Message{},
+	}
+
+	result, ok = FromError(kitErr)
+	if !ok || !reflect.DeepEqual(result, &kitErr) {
+		t.Errorf("Expected result to be %#v and ok to be true, got result: %#v, ok: %t", &kitErr, result, ok)
+	}
+
+	var nonKitError error
+	result, ok = FromError(nonKitError)
+	if result != nil || ok {
+		t.Errorf("Expected result to be nil and ok to be false, got result: %#v, ok: %t", result, ok)
+	}
+}