CLEANUP: opentracing: simplify the condition on the empty header

The second patch from the last series of patches has been redesigned
here, the ist() function is used to set an empty string instead of
working directly with the string pointer.

I thank Tim Düsterhus for his advice.

diff --git a/addons/ot/src/http.c b/addons/ot/src/http.c
index 1517e71e4868a08f41f428a1176a64eb609cfd83..0d824ddb552321d082a0d972a8da65393a0d2a94 100644 (file)
--- a/addons/ot/src/http.c
+++ b/addons/ot/src/http.c
@@ -133,20 +133,25 @@ struct otc_text_map *flt_ot_http_headers_get(struct channel *chn, const char *pr
 
                                v = htx_get_blk_value(htx, blk);
 
+                               /*
+                                * In case the data of the HTTP header is not
+                                * specified, v.ptr will have some non-null
+                                * value and v.len will be equal to 0.  The
+                                * otc_text_map_add() function will not
+                                * interpret this well.  In this case v.ptr
+                                * is set to an empty string.
+                                */
+                               if (v.len == 0)
+                                       v = ist("");
+
                                /*
                                 * Here, an HTTP header (which is actually part
                                 * of the span context is added to the text_map.
                                 *
                                 * Before adding, the prefix is removed from the
                                 * HTTP header name.
-                                *
-                                * In case the data of the HTTP header is not
-                                * specified, v.len will be equal to 0, and
-                                * the function otc_text_map_add() will not
-                                * interpret this well.  In this case, instead
-                                * of v.ptr, "" is used.
                                 */
-                               if (otc_text_map_add(retptr, n.ptr + prefix_len, n.len - prefix_len, (v.len > 0) ? v.ptr : "", v.len, OTC_TEXT_MAP_DUP_KEY | OTC_TEXT_MAP_DUP_VALUE) == -1) {
+                               if (otc_text_map_add(retptr, n.ptr + prefix_len, n.len - prefix_len, v.ptr, v.len, OTC_TEXT_MAP_DUP_KEY | OTC_TEXT_MAP_DUP_VALUE) == -1) {
                                        FLT_OT_ERR("failed to add HTTP header data");
 
                                        otc_text_map_destroy(&retptr, OTC_TEXT_MAP_FREE_KEY | OTC_TEXT_MAP_FREE_VALUE);