partial move to letting bridge descriptor fetches use our new (well,

new from their perspective) directory download schedule abstraction.

not done yet, but i'd better get this out of my sandbox before nick
does another sweeping change. :)


svn:r17798

src/or/directory.c

@@ -3288,6 +3288,45 @@ static const int server_consensus_dl_schedule[] = {
 static const int client_consensus_dl_schedule[] = {
   0, 0, 60, 60*5, 60*10, 60*30, 60*60, 60*60, 60*60, 60*60*3, 60*60*6, 60*60*12
 };
+/** Schedule for when clients should download bridge descriptors. */
+static const int bridge_dl_schedule[] = {
+  60*60, 15*60, 15*60, 60*60
+};
+
+/** Decide which download schedule we want to use, and then return a
+ * pointer to it along with a pointer to its length. Helper function for
+ * download_status_increment_failure() and download_status_reset(). */
+static void
+find_dl_schedule_and_len(download_status_t *dls, int server,
+                         const int **schedule, size_t *schedule_len)
+{
+  switch (dls->schedule) {
+    case DL_SCHED_GENERIC:
+      if (server) {
+        *schedule = server_dl_schedule;
+        *schedule_len = sizeof(server_dl_schedule)/sizeof(int);
+      } else {
+        *schedule = client_dl_schedule;
+        *schedule_len = sizeof(client_dl_schedule)/sizeof(int);
+      }
+      break;
+    case DL_SCHED_CONSENSUS:
+      if (server) {
+        *schedule = server_consensus_dl_schedule;
+        *schedule_len = sizeof(server_consensus_dl_schedule)/sizeof(int);
+      } else {
+        *schedule = client_consensus_dl_schedule;
+        *schedule_len = sizeof(client_consensus_dl_schedule)/sizeof(int);
+      }
+      break;
+    case DL_SCHED_BRIDGE:
+      *schedule = bridge_dl_schedule;
+      *schedule_len = sizeof(bridge_dl_schedule)/sizeof(int);
+      break;
+    default:
+      tor_assert(0);
+  }
+}
 
 /** Called when an attempt to download <b>dls</b> has failed with HTTP status
  * <b>status_code</b>.  Increment the failure count (if the code indicates a
@@ -3306,28 +3345,7 @@ download_status_increment_failure(download_status_t *dls, int status_code,
       ++dls->n_download_failures;
   }
 
-  switch (dls->schedule) {
-    case DL_SCHED_GENERIC:
-      if (server) {
-        schedule = server_dl_schedule;
-        schedule_len = sizeof(server_dl_schedule)/sizeof(int);
-      } else {
-        schedule = client_dl_schedule;
-        schedule_len = sizeof(client_dl_schedule)/sizeof(int);
-      }
-      break;
-    case DL_SCHED_CONSENSUS:
-      if (server) {
-        schedule = server_consensus_dl_schedule;
-        schedule_len = sizeof(server_consensus_dl_schedule)/sizeof(int);
-      } else {
-        schedule = client_consensus_dl_schedule;
-        schedule_len = sizeof(client_consensus_dl_schedule)/sizeof(int);
-      }
-      break;
-    default:
-      tor_assert(0);
-  }
+  find_dl_schedule_and_len(dls, server, &schedule, &schedule_len);
 
   if (dls->n_download_failures < schedule_len)
     increment = schedule[dls->n_download_failures];
@@ -3357,12 +3375,24 @@ download_status_increment_failure(download_status_t *dls, int status_code,
 }
 
 /** Reset <b>dls</b> so that it will be considered downloadable
- * immediately. */
+ * immediately, and/or to show that we don't need it anymore.
+ *
+ * (We find the zeroth element of the download schedule, and set
+ * next_attempt_at to be the appropriate offset from 'now'. In most
+ * cases this means setting it to 'now', so the item will be immediately
+ * downloadable; in the case of bridge descriptors, the zeroth element
+ * is an hour from now.) */
 void
 download_status_reset(download_status_t *dls)
 {
+  const int *schedule;
+  size_t schedule_len;
+
+  find_dl_schedule_and_len(dls, get_options()->DirPort,
+                           &schedule, &schedule_len);
+
   dls->n_download_failures = 0;
-  dls->next_attempt_at = 0;
+  dls->next_attempt_at = time(NULL) + schedule[0];
 }
 
 /** Called when one or more routerdesc (or extrainfo, if <b>was_extrainfo</b>)

src/or/or.h

@@ -1287,6 +1287,7 @@ typedef enum {
 typedef enum {
   DL_SCHED_GENERIC = 0,
   DL_SCHED_CONSENSUS = 1,
+  DL_SCHED_BRIDGE = 2,
 } download_schedule_t;
 
 /** Information about our plans for retrying downloads for a downloadable