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Stop searching routerlist for routers with the same identity as other routers (on router insert): we already have a map for that. (We need to add an index field to routerinfo_t so we can figure out which point in the routerlist to replace.) Also, add a comment to routerlist.c; arma, please advise?
svn:r8432
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@ -1,8 +1,9 @@
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Changes in version 0.1.2.2-alpha - 2006-??-??
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o Minor Bugfixes
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- Small performance improvements on parsing and inserting
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descriptors.
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- Small performance improvements on parsing descriptors.
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- Major performance descriptor on inserting descriptors; change
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algorithm from O(n^2) to O(n). [Mostly.]
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- Make the common memory allocation path faster on machines where
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malloc(0) returns a pointer.
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@ -928,6 +928,10 @@ typedef struct {
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/** How many times has a descriptor been posted and we believed
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* this router to be unreachable? We only actually warn on the third. */
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int num_unreachable_notifications;
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/** What position is this descriptor within routerlist->routers? -1 for
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* none. */
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int routerlist_index;
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} routerinfo_t;
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/** Contents of a single router entry in a network status object.
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@ -805,6 +805,7 @@ router_rebuild_descriptor(int force)
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}
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ri = tor_malloc_zero(sizeof(routerinfo_t));
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ri->routerlist_index = -1;
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ri->address = tor_dup_addr(addr);
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ri->nickname = tor_strdup(options->Nickname);
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ri->addr = addr;
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@ -1343,6 +1343,7 @@ routerlist_insert(routerlist_t *rl, routerinfo_t *ri)
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digestmap_set(rl->desc_digest_map, ri->cache_info.signed_descriptor_digest,
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&(ri->cache_info));
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smartlist_add(rl->routers, ri);
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ri->routerlist_index = smartlist_len(rl->routers) - 1;
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router_dir_info_changed();
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// routerlist_assert_ok(rl);
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}
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@ -1356,6 +1357,7 @@ routerlist_insert_old(routerlist_t *rl, routerinfo_t *ri)
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signed_descriptor_t *sd = signed_descriptor_from_routerinfo(ri);
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digestmap_set(rl->desc_digest_map, sd->signed_descriptor_digest, sd);
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smartlist_add(rl->old_routers, sd);
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ri->routerlist_index = -1;
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} else {
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routerinfo_free(ri);
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}
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@ -1374,7 +1376,13 @@ routerlist_remove(routerlist_t *rl, routerinfo_t *ri, int idx, int make_old)
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idx = _routerlist_find_elt(rl->routers, ri, idx);
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if (idx < 0)
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return;
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ri->routerlist_index = -1;
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smartlist_del(rl->routers, idx);
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if (idx < smartlist_len(rl->routers)) {
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routerinfo_t *r = smartlist_get(rl->routers, idx);
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r->routerlist_index = idx;
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}
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ri_tmp = digestmap_remove(rl->identity_map, ri->cache_info.identity_digest);
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router_dir_info_changed();
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tor_assert(ri_tmp == ri);
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@ -1423,6 +1431,8 @@ routerlist_replace(routerlist_t *rl, routerinfo_t *ri_old,
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router_dir_info_changed();
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if (idx >= 0) {
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smartlist_set(rl->routers, idx, ri_new);
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ri_old->routerlist_index = -1;
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ri_new->routerlist_index = idx;
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} else {
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log_warn(LD_BUG, "Appending entry from routerlist_replace.");
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routerlist_insert(rl, ri_new);
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@ -1606,10 +1616,10 @@ int
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router_add_to_routerlist(routerinfo_t *router, const char **msg,
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int from_cache, int from_fetch)
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{
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int i;
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const char *id_digest;
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int authdir = get_options()->AuthoritativeDir;
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int authdir_believes_valid = 0;
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routerinfo_t *old_router;
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tor_assert(msg);
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@ -1665,71 +1675,91 @@ router_add_to_routerlist(routerinfo_t *router, const char **msg,
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rs->need_to_mirror = 0;
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});
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/* If we have a router with this name, and the identity key is the same,
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* choose the newer one. If the identity key has changed, and one of the
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/* If we have a router with the same identity key, choose the newer one. */
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old_router = digestmap_get(routerlist->identity_map,
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router->cache_info.identity_digest);
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if (old_router) {
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int pos = old_router->routerlist_index;
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tor_assert(smartlist_get(routerlist->routers, pos) == old_router);
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if (router->cache_info.published_on <=
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old_router->cache_info.published_on) {
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/* Same key, but old */
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log_debug(LD_DIR, "Skipping not-new descriptor for router '%s'",
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router->nickname);
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/* Only journal this desc if we'll be serving it. */
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if (!from_cache && get_options()->DirPort)
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router_append_to_journal(&router->cache_info);
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routerlist_insert_old(routerlist, router);
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*msg = "Router descriptor was not new.";
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return -1;
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} else {
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/* Same key, new. */
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int unreachable = 0;
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log_debug(LD_DIR, "Replacing entry for router '%s/%s' [%s]",
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router->nickname, old_router->nickname,
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hex_str(id_digest,DIGEST_LEN));
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if (router->addr == old_router->addr &&
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router->or_port == old_router->or_port) {
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/* these carry over when the address and orport are unchanged.*/
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router->last_reachable = old_router->last_reachable;
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router->testing_since = old_router->testing_since;
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router->num_unreachable_notifications =
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old_router->num_unreachable_notifications;
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}
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if (authdir && !from_cache && !from_fetch &&
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router_have_minimum_dir_info() &&
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dirserv_thinks_router_is_blatantly_unreachable(router,
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time(NULL))) {
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if (router->num_unreachable_notifications >= 3) {
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unreachable = 1;
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log_notice(LD_DIR, "Notifying server '%s' that it's unreachable. "
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"(ContactInfo '%s', platform '%s').",
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router->nickname,
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router->contact_info ? router->contact_info : "",
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router->platform ? router->platform : "");
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} else {
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log_info(LD_DIR,"'%s' may be unreachable -- the %d previous "
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"descriptors were thought to be unreachable.",
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router->nickname, router->num_unreachable_notifications);
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router->num_unreachable_notifications++;
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}
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}
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routerlist_replace(routerlist, old_router, router, pos, 1);
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if (!from_cache) {
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router_append_to_journal(&router->cache_info);
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}
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directory_set_dirty();
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*msg = unreachable ? "Dirserver believes your ORPort is unreachable" :
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authdir_believes_valid ? "Valid server updated" :
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("Invalid server updated. (This dirserver is marking your "
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"server as unapproved.)");
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return unreachable ? 1 : 0;
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}
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}
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#if 1
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/* XXXX This block is slow, and could be smarter. All it does is ensure
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* that if we have a named server called "Foo", we will never have another
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* server called "Foo." router_get_by_nickname() already knows to prefer
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* named routers, so the problem only arises when there is a named router
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* called 'foo', but we don't have it. If, instead, we kept a
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* name-to-identity-key mapping for each named router in the networkstatus
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* list, we could eliminate this block.
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*
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* Hm. perhaps we should; I don't see how this code is non-broken wrt named
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* routers. -NM
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*/
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/* If the identity key has changed, and one of the
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* routers is named, drop the unnamed ones. (If more than one are named,
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* drop the old ones.)
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*/
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for (i = 0; i < smartlist_len(routerlist->routers); ++i) {
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routerinfo_t *old_router = smartlist_get(routerlist->routers, i);
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/* XXXX This might be a slow point; can't we just look up in one of the
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* digestmaps? -NM */
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if (!memcmp(router->cache_info.identity_digest,
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old_router->cache_info.identity_digest, DIGEST_LEN)) {
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if (router->cache_info.published_on <=
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old_router->cache_info.published_on) {
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/* Same key, but old */
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log_debug(LD_DIR, "Skipping not-new descriptor for router '%s'",
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router->nickname);
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/* Only journal this desc if we'll be serving it. */
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if (!from_cache && get_options()->DirPort)
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router_append_to_journal(&router->cache_info);
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routerlist_insert_old(routerlist, router);
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*msg = "Router descriptor was not new.";
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return -1;
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} else {
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/* Same key, new. */
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int unreachable = 0;
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log_debug(LD_DIR, "Replacing entry for router '%s/%s' [%s]",
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router->nickname, old_router->nickname,
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hex_str(id_digest,DIGEST_LEN));
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if (router->addr == old_router->addr &&
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router->or_port == old_router->or_port) {
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/* these carry over when the address and orport are unchanged.*/
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router->last_reachable = old_router->last_reachable;
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router->testing_since = old_router->testing_since;
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router->num_unreachable_notifications =
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old_router->num_unreachable_notifications;
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}
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if (authdir && !from_cache && !from_fetch &&
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router_have_minimum_dir_info() &&
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dirserv_thinks_router_is_blatantly_unreachable(router,
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time(NULL))) {
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if (router->num_unreachable_notifications >= 3) {
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unreachable = 1;
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log_notice(LD_DIR, "Notifying server '%s' that it's unreachable. "
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"(ContactInfo '%s', platform '%s').",
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router->nickname,
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router->contact_info ? router->contact_info : "",
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router->platform ? router->platform : "");
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} else {
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log_info(LD_DIR,"'%s' may be unreachable -- the %d previous "
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"descriptors were thought to be unreachable.",
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router->nickname, router->num_unreachable_notifications);
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router->num_unreachable_notifications++;
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}
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}
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routerlist_replace(routerlist, old_router, router, i, 1);
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if (!from_cache) {
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router_append_to_journal(&router->cache_info);
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}
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directory_set_dirty();
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*msg = unreachable ? "Dirserver believes your ORPort is unreachable" :
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authdir_believes_valid ? "Valid server updated" :
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("Invalid server updated. (This dirserver is marking your "
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"server as unapproved.)");
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return unreachable ? 1 : 0;
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}
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} else if (!strcasecmp(router->nickname, old_router->nickname)) {
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/* nicknames match, keys don't. */
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if (router->is_named) {
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@ -1760,6 +1790,8 @@ router_add_to_routerlist(routerinfo_t *router, const char **msg,
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}
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}
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}
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#endif
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/* We haven't seen a router with this name before. Add it to the end of
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* the list. */
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routerlist_insert(routerlist, router);
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@ -3970,6 +4002,7 @@ routerlist_assert_ok(routerlist_t *rl)
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sd2 = digestmap_get(rl->desc_digest_map,
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r->cache_info.signed_descriptor_digest);
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tor_assert(&(r->cache_info) == sd2);
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tor_assert(r->routerlist_index == r_sl_idx);
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});
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SMARTLIST_FOREACH(rl->old_routers, signed_descriptor_t *, sd,
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{
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@ -752,6 +752,7 @@ router_parse_entry_from_string(const char *s, const char *end,
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}
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router = tor_malloc_zero(sizeof(routerinfo_t));
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router->routerlist_index = -1;
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if (cache_copy)
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router->cache_info.signed_descriptor_body = tor_strndup(s, end-s);
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router->cache_info.signed_descriptor_len = end-s;
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