Check if dir ls/dump returns nil

Change-Id: I9a0a74f53825fc0255bc664c06e32eaef6c45d82
Signed-off-by: Ondrej Fabry <ofabry@cisco.com>

diff --git a/adapter/vppapiclient/stat_client.go b/adapter/vppapiclient/stat_client.go
index 55705bd..24700a3 100644 (file)
--- a/adapter/vppapiclient/stat_client.go
+++ b/adapter/vppapiclient/stat_client.go
@@ -161,6 +161,7 @@ govpp_stat_segment_string_vector(uint8_t ** string_vector, char *string)
 */
 import "C"
 import (
+       "errors"
        "fmt"
        "os"
        "unsafe"
@@ -168,6 +169,11 @@ import (
        "git.fd.io/govpp.git/adapter"
 )
 
+var (
+       ErrStatDirBusy  = errors.New("stat dir busy")
+       ErrStatDumpBusy = errors.New("stat dump busy")
+)
+
 var (
        // DefaultStatSocket is the default path for the VPP stat socket file.
        DefaultStatSocket = "/run/vpp/stats.sock"
@@ -219,6 +225,9 @@ func (c *statClient) Disconnect() error {
 
 func (c *statClient) ListStats(patterns ...string) (stats []string, err error) {
        dir := C.govpp_stat_segment_ls(convertStringSlice(patterns))
+       if dir == nil {
+               return nil, ErrStatDirBusy
+       }
        defer C.govpp_stat_segment_vec_free(unsafe.Pointer(dir))
 
        l := C.govpp_stat_segment_vec_len(unsafe.Pointer(dir))
@@ -233,9 +242,15 @@ func (c *statClient) ListStats(patterns ...string) (stats []string, err error) {
 
 func (c *statClient) DumpStats(patterns ...string) (stats []*adapter.StatEntry, err error) {
        dir := C.govpp_stat_segment_ls(convertStringSlice(patterns))
+       if dir == nil {
+               return nil, ErrStatDirBusy
+       }
        defer C.govpp_stat_segment_vec_free(unsafe.Pointer(dir))
 
        dump := C.govpp_stat_segment_dump(dir)
+       if dump == nil {
+               return nil, ErrStatDumpBusy
+       }
        defer C.govpp_stat_segment_data_free(dump)
 
        l := C.govpp_stat_segment_vec_len(unsafe.Pointer(dump))