Fixed: [Backend can not read datastore with container named config #147](https://github.com/clicon/clixon/issues/147)

CHANGELOG.md

@@ -67,6 +67,7 @@ Developers may need to change their code
 
 ### Corrected Bugs
 
+* Fixed: [Backend can not read datastore with container named "config" #147](https://github.com/clicon/clixon/issues/147)
 * Fixed: [The config false leaf shouldn't be configed in startup stage #189](https://github.com/clicon/clixon/issues/189)
 * Fixed: [CLIXON is not waiting for the hello message #184](https://github.com/clicon/clixon/issues/184)
   * See also API changes

apps/restconf/restconf_methods.c

@@ -340,7 +340,7 @@ api_data_write(clicon_handle h,
     }
     /* Create a dummy data tree parent to hook in the parsed data.
      */
-    if ((xdata0 = xml_new("data0", NULL, CX_ELMNT)) == NULL)
+    if ((xdata0 = xml_new(XML_TOP_SYMBOL, NULL, CX_ELMNT)) == NULL)
 	goto done;
     if (api_path){ /* XXX mv to copy? */
 	cxobj *xfrom;
@@ -357,8 +357,12 @@ api_data_write(clicon_handle h,
 		goto done;
 	}
     }
-    if (xml_spec(xdata0)==NULL)
+    if (xml_spec(xdata0)==NULL){
-	yb = YB_MODULE;
+	if (api_path==NULL)
+	    yb = YB_MODULE_NEXT; /*  data is eg: <data><x> */
+	else
+	    yb = YB_MODULE;      /*  data is eg: <x> */
+    }
     else
 	yb = YB_PARENT;
 

include/clixon_custom.h

@@ -72,16 +72,6 @@
  */
 #define XML_EXPLICIT_INDEX
 
-/*! Treat <config> and <data> specially in a xmldb datastore.
- * config/data is treated as a "neutral" tag that does not have a yang spec.
- * In particular when binding xml to yang, if <config> is encountered as top-of-tree, do not
- * try to bind a yang-spec to this symbol.
- * The root of this is GET and PUT commands where the <config> and <data> tag belongs to the
- * RPC rather than the data.
- * This is a hack, there must be a way to make this more generic
- */
-#define XMLDB_CONFIG_HACK
-
 /*! Let state data be ordered-by system
  * RFC 7950 is cryptic about this
  * It says in 7.7.7:
@@ -97,6 +87,5 @@
  * This is traditionally same as NETCONF_INPUT_CONFIG ("config") but can be different
  * If you change this, you need to change test shell variable in lib.sh: DATASTORE_TOP
  * Consider making this an option or configure option 
- * see XMLDB_CONFIG_HACK 
  */
 #define DATASTORE_TOP_SYMBOL "config"

lib/clixon/clixon_xml.h

@@ -125,7 +125,14 @@ enum cxobj_type {CX_ERROR=-1,
  */
 enum yang_bind{ 
     YB_NONE=0,   /* Dont do Yang binding */
-    YB_MODULE,   /* Search for matching yang binding among top-level symbols of Yang modules */
+    YB_MODULE,   /* Search for matching yang binding among top-level symbols of Yang modules of direct
+		  * children
+		  * Ie, xml looks like: <top><x>... where "x" is a top-level symbol in a module
+		  */
+    YB_MODULE_NEXT, /* Search for matching yang binding among top-level symbols of Yang modules of
+		  * next-level children
+		  * Ie, xml looks like: <top><config><x>... where "x" is a top-level symbol in a module
+		  */
     YB_PARENT,   /* Assume yang binding of existing parent and match its children by name */
     YB_RPC,      /* Assume top-level xml is an netconf RPC message (or hello) */
 

lib/src/clixon_datastore_read.c

@@ -462,8 +462,11 @@ xmldb_readfile(clicon_handle    h,
 	if ((ret = clixon_json_parse_file(fp, yb, yspec, &x0, NULL)) < 0) /* XXX: ret == 0*/
 	    goto done;
     }
-    else if ((ret = clixon_xml_parse_file(fp, yb, yspec, NULL /* "</config>" XXX */, &x0, NULL)) < 0)
+    else {
-	goto done;
+	if ((ret = clixon_xml_parse_file(fp, yb, yspec, NULL, &x0, NULL)) < 0){
+	    goto done;
+	}
+    }
 #ifdef XMLDB_READFILE_FAIL /* The functions calling this function cannot handle a failed parse yet */
     if (ret == 0)
     	goto fail;
@@ -553,7 +556,10 @@ xmldb_get_nocache(clicon_handle    h,
 	clicon_err(OE_YANG, ENOENT, "No yang spec");
 	goto done;
     }
-    if ((ret = xmldb_readfile(h, db, YB_MODULE, yspec, &xt, &de0, msdiff)) < 0)
+    /* xml looks like: <top><config><x>... where "x" is a top-level symbol in a module */
+    if ((ret = xmldb_readfile(h, db,
+			      yb==YB_MODULE?YB_MODULE_NEXT:yb,
+			      yspec, &xt, &de0, msdiff)) < 0)
 	goto done;
     if (ret == 0)
 	goto fail;
@@ -664,7 +670,10 @@ xmldb_get_cache(clicon_handle    h,
     de = clicon_db_elmnt_get(h, db);
     if (de == NULL || de->de_xml == NULL){ /* Cache miss, read XML from file */
 	/* If there is no xml x0 tree (in cache), then read it from file */
-	if ((ret = xmldb_readfile(h, db, yb, yspec, &x0t, &de0, msdiff)) < 0)
+	/* xml looks like: <top><config><x>... where "x" is a top-level symbol in a module */
+	if ((ret = xmldb_readfile(h, db,
+				  yb==YB_MODULE?YB_MODULE_NEXT:yb,
+				  yspec, &x0t, &de0, msdiff)) < 0)
 	    goto done;
 	if (ret == 0)
 	    goto fail;
@@ -808,7 +817,10 @@ xmldb_get_zerocopy(clicon_handle    h,
     de = clicon_db_elmnt_get(h, db);
     if (de == NULL || de->de_xml == NULL){ /* Cache miss, read XML from file */
 	/* If there is no xml x0 tree (in cache), then read it from file */
-	if ((ret = xmldb_readfile(h, db, yb, yspec, &x0t, &de0, msdiff)) < 0)
+	/* xml looks like: <top><config><x>... where "x" is a top-level symbol in a module */
+	if ((ret = xmldb_readfile(h, db,
+				  yb==YB_MODULE?YB_MODULE_NEXT:yb,
+				  yspec, &x0t, &de0, msdiff)) < 0)
 	    goto done;
 	if (ret == 0)
 	    goto fail;

lib/src/clixon_datastore_write.c

@@ -947,7 +947,8 @@ xmldb_put(clicon_handle       h,
     /* If there is no xml x0 tree (in cache), then read it from file */
     if (x0 == NULL){
 	firsttime++; /* to avoid leakage on error, see fail from text_modify */
-	if ((ret = xmldb_readfile(h, db, YB_MODULE, yspec, &x0, de, NULL)) < 0)
+	/* xml looks like: <top><config><x>... where "x" is a top-level symbol in a module */
+	if ((ret = xmldb_readfile(h, db, YB_MODULE_NEXT, yspec, &x0, de, NULL)) < 0)
 	    goto done;
 	if (ret == 0)
 	    goto fail;

lib/src/clixon_json.c

@@ -1231,10 +1231,7 @@ _json_parse(char      *str,
 	 * members of a top-level JSON object 
 	 */
 	if (yspec && xml_prefix(x) == NULL
-#ifdef XMLDB_CONFIG_HACK
+	    /* && yb != YB_MODULE_NEXT   XXX Dont know what this is for */
-	    //	     && !xml_flag(x, XML_FLAG_TOP)
-	    	    && strcmp(xml_name(x), DATASTORE_TOP_SYMBOL) != 0 
-#endif
 	    ){
 	    if ((cberr = cbuf_new()) == NULL){
 		clicon_err(OE_UNIX, errno, "cbuf_new");
@@ -1260,24 +1257,15 @@ _json_parse(char      *str,
 	    if (ret == 0)
 		failed++;
 	    break;
+	case YB_MODULE_NEXT:
+	    if ((ret = xml_bind_yang(x, YB_MODULE, yspec, xerr)) < 0)
+		goto done;
+	    if (ret == 0)
+		failed++;
+	    break;
 	case YB_MODULE:
-#ifdef XMLDB_CONFIG_HACK
+	    if ((ret = xml_bind_yang0(x, yb, yspec, xerr)) < 0)
-	    if (
+		goto done;
-		//			xml_flag(x, XML_FLAG_TOP)
-	        strcmp(xml_name(x), DATASTORE_TOP_SYMBOL) == 0 
-	    || strcmp(xml_name(x), NETCONF_OUTPUT_DATA) == 0
-	    ){
-		/* xt:<top>         nospec
-		 * x:   <config>
-		 *         <a>  <-- populate from modules
-		 */
-		if ((ret = xml_bind_yang(x, yb, yspec, xerr)) < 0)
-		    goto done;
-	    }
-	    else
-#endif
-		if ((ret = xml_bind_yang0(x, yb, yspec, xerr)) < 0)
-		    goto done;
 	    if (ret == 0)
 		failed++;
 	    break;

lib/src/clixon_xml_io.c

@@ -508,25 +508,16 @@ _xml_parse(const char *str,
 		failed++;
 	    break;
 
+	case YB_MODULE_NEXT:
+	    if ((ret = xml_bind_yang(x, YB_MODULE, yspec, xerr)) < 0)
+		goto done;
+	    if (ret == 0)
+		failed++;
+	    break;
 	case YB_MODULE:
 	    /* xt:<top>     nospec
 	     * x:   <a> <-- populate from modules
 	     */
-#ifdef XMLDB_CONFIG_HACK
-	    if (
-		//		 xml_flag(x, XML_FLAG_TOP)
-		strcmp(xml_name(x), DATASTORE_TOP_SYMBOL) == 0
-		|| strcmp(xml_name(x), NETCONF_OUTPUT_DATA) == 0
-		){
-		/* xt:<top>         nospec
-		 * x:   <config>
-		 *         <a>  <-- populate from modules
-		 */
-		if ((ret = xml_bind_yang(x, YB_MODULE, yspec, xerr)) < 0)
-		    goto done;
-	    }
-	    else
-#endif
 	    if ((ret = xml_bind_yang0(x, YB_MODULE, yspec, xerr)) < 0)
 		goto done;
 	    if (ret == 0)

lib/src/clixon_xml_map.c

@@ -1762,9 +1762,6 @@ assign_namespace_element(cxobj *x0, /* source */
     char      *prefix0 = NULL;;
     int        isroot;
     
-    /* XXX: need to identify root better than hiereustics and strcmp,... 
-     * see XMLDB_CONFIG_HACK
-     */
     isroot = xml_parent(x1p)==NULL &&
 	xml_flag(x1p, XML_FLAG_TOP) &&
 	xml_prefix(x1p)==NULL;