Fixed: [Multiple http requests in native restconf yields same reply #212](https://github.com/clicon/clixon/issues/212)

CHANGELOG.md

@@ -45,6 +45,10 @@ Expected: June 2021
   * hide-database : specifies that a command is not visible in database. This can be useful for setting passwords and not exposing them to users.
 	* hide-database-auto-completion : specifies that a command is not visible in database and in auto completion. This can be useful for a password that was put in device by super user, not be changed.
 	
+### Corrected Bugs
+
+* Fixed: [Multiple http requests in native restconf yields same reply #212](https://github.com/clicon/clixon/issues/212)
+
 ## 5.1.0
 15 April 2021
 

apps/restconf/restconf_main_native.c

@@ -946,12 +946,25 @@ restconf_connection(int   s,
 	    struct evbuffer *ev;
 
 	    if ((ev = bufferevent_get_output(conn->bev)) != NULL){
-		buf = (char*)evbuffer_pullup(ev, -1);
 		buflen = evbuffer_get_length(ev);
-		clicon_debug(1, "%s buf:%s", __FUNCTION__, buf);
 		if (buflen){
+#ifdef RESTCONF_LIBEVENT_POS_PATCH
+		    size_t    pos;
+
+		    pos = (size_t)conn->arg;
+#endif
+		    buf = (char*)evbuffer_pullup(ev, -1);
+		    clicon_debug(1, "%s buf:%s", __FUNCTION__, buf);
+#ifdef RESTCONF_LIBEVENT_POS_PATCH
+		    if (buf_write(buf+pos, buflen, conn->sock, conn->ssl) < 0)
+			goto done;
+		    pos += buflen;
+		    conn->arg = (void*)pos;
+#else
+		    /* Does not work w multiple requests */
 		    if (buf_write(buf, buflen, conn->sock, conn->ssl) < 0)
 			goto done;
+#endif
 		}
 		else{
 		    /* Return 0 from evhtp parser can be that it needs more data.
@@ -1231,6 +1244,12 @@ restconf_accept_client(int   fd,
     /*
      * Register callbacks for actual data socket 
      */
+#ifdef LIBEVENT_POS_PATCH
+    /* patch to keep track os position in output buffer 
+     * cannot use drain/copyout since the start position is "freezed" in bufferevent_socket_new
+     */
+    conn->arg = (void*)0; 
+#endif
     if (clixon_event_reg_fd(s, restconf_connection, (void*)conn, "restconf client socket") < 0)
 	goto done;
  ok:

include/clixon_custom.h

@@ -93,3 +93,14 @@
 /* Name of default netns for clixon-restconf.yang socket/namespace field
  */
 #define RESTCONF_NETNS_DEFAULT "default"
+
+/* Patch to keep track os position in output buffer for native restconf using libevent
+ * It addresses that multiple requests in a single TCP HTTP session will only reply first
+ * reply again
+ * Cannot use drain/copyout since the start position is "freezed" in bufferevent_socket_new
+ * Strange thing is that evbuffer_drain / evbuffer_copyout cannot be used due to freeze set
+ * One could have thought freeze was in place for writing only?
+ * Note may not wrap-around correctly at size-t boundary
+
+ */
+#define RESTCONF_LIBEVENT_POS_PATCH

test/test_restconf_op.sh

@@ -197,6 +197,13 @@ expectpart "$(curl $CURLOPTS -X PUT -H "Content-Type: application/yang-data+json
 new "restconf GET datastore eth"
 expectpart "$(curl $CURLOPTS -X GET $RCPROTO://localhost/restconf/data/example:cont1/interface=local0)" 0 "HTTP/1.1 200 OK" '{"example:interface":\[{"name":"local0","type":"eth0"}\]}'
 
+new "restconf DELETE whole datastore"
+expectpart "$(curl $CURLOPTS -X DELETE $RCPROTO://localhost/restconf/data)" 0 "HTTP/1.1 204 No Content"
+
+#--------------- Multiple request in single TCP tests
+
+expectpart "$(curl $CURLOPTS -H "Accept: application/yang-data+xml" -X GET $RCPROTO://localhost/restconf/data?content=config --next $CURLOPTS -H "Content-Type: application/yang-data+json" -X POST $RCPROTO://localhost/restconf/data -d '{"example:cont1":{"interface":{"name":"local0","type":"regular"}}}')" 0 "HTTP/1.1 200 OK" '<data/>' 'HTTP/1.1 201 Created'
+
 #--------------- json type tests
 new "restconf POST type x3 POST"
 expectpart "$(curl $CURLOPTS -X POST -H "Content-Type: application/yang-data+json" -d '{"example:types":{"tint":42,"tdec64":42.123,"tbool":false,"tstr":"str"}}' $RCPROTO://localhost/restconf/data)" 0 "HTTP/1.1 201 Created" "Location: $RCPROTO://localhost/restconf/data/example:types"