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path: simplify reversal of paths (closes #224)

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This commit is contained in:
Steffen Vogel 2019-02-12 17:54:35 +01:00
parent b0d497eee4
commit 3816b8f45e
3 changed files with 31 additions and 49 deletions
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2
include/villas/path.h
View file

@ -172,6 +172,8 @@ int path_uses_node(struct path *p, struct node *n);
*/
int path_parse(struct path *p, json_t *cfg, struct vlist *nodes);
int path_is_simple(struct path *p);
/** @} */
#ifdef __cplusplus

52
lib/path.c
View file

@ -921,50 +921,22 @@ int path_uses_node(struct path *p, struct node *n)
return -1;
}
int path_reverse(struct path *p, struct path *r)
int path_is_simple(struct path *p)
{
if (vlist_length(&p->destinations) != 1 || vlist_length(&p->sources) != 1)
return -1;
int ret;
const char *in = NULL, *out = NULL;
/* General */
r->enabled = p->enabled;
ret = json_unpack(p->cfg, "{ s: s, s: s }", "in", &in, "out", &out);
if (ret)
return ret;
/* Source / Destinations */
struct path_destination *orig_pd = vlist_first(&p->destinations);
struct path_source *orig_ps = vlist_first(&p->sources);
ret = node_is_valid_name(in);
if (ret)
return ret;
struct path_destination *new_pd = (struct path_destination *) alloc(sizeof(struct path_destination));
struct path_source *new_ps = (struct path_source *) alloc(sizeof(struct path_source));
struct mapping_entry *new_me = alloc(sizeof(struct mapping_entry));
new_pd->node = orig_ps->node;
new_ps->node = orig_pd->node;
new_ps->masked = true;
new_me->node = new_ps->node;
new_me->type = MAPPING_TYPE_DATA;
new_me->data.offset = 0;
new_me->length = vlist_length(&new_me->node->in.signals);
vlist_init(&new_ps->mappings);
vlist_push(&new_ps->mappings, new_me);
vlist_push(&r->destinations, new_pd);
vlist_push(&r->sources, new_ps);
#ifdef WITH_HOOKS
for (size_t i = 0; i < vlist_length(&p->hooks); i++) {
int ret;
struct hook *h = (struct hook *) vlist_at(&p->hooks, i);
struct hook *g = (struct hook *) alloc(sizeof(struct hook));
ret = hook_init(g, h->_vt, r, NULL);
if (ret)
return ret;
vlist_push(&r->hooks, g);
}
#endif /* WITH_HOOKS */
ret = node_is_valid_name(out);
if (ret)
return ret;
return 0;
}

26
lib/super_node.cpp
View file

@ -251,7 +251,7 @@ int SuperNode::parseJson(json_t *j)
size_t i;
json_t *json_path;
json_array_foreach(json_paths, i, json_path) {
path *p = (path *) alloc(sizeof(path));
parse: path *p = (path *) alloc(sizeof(path));
ret = path_init(p);
if (ret)
@ -264,17 +264,25 @@ int SuperNode::parseJson(json_t *j)
vlist_push(&paths, p);
if (p->reverse) {
path *r = (path *) alloc(sizeof(path));
ret = path_init(r);
/* Only simple paths can be reversed */
ret = path_is_simple(p);
if (ret)
throw RuntimeError("Failed to init path");
throw RuntimeError("Complex paths can not be reversed!");
ret = path_reverse(p, r);
if (ret)
throw RuntimeError("Failed to reverse path {}", path_name(p));
/* Parse a second time with in/out reversed */
json_path = json_copy(json_path);
vlist_push(&paths, r);
json_t *json_in = json_object_get(json_path, "in");
json_t *json_out = json_object_get(json_path, "out");
if (json_equal(json_in, json_out))
throw RuntimeError("Can not reverse path with identical in/out nodes!");
json_object_set(json_path, "reverse", json_false());
json_object_set(json_path, "in", json_out);
json_object_set(json_path, "out", json_in);
goto parse;
}
}
}