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[tor-commits] [tor/release-0.3.3] Remove the old ("deterministic") download schedule.



commit e0049ef022b8bf9b808a9074820bb2a33f92ac1b
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date:   Thu Jan 25 15:51:13 2018 -0500

    Remove the old ("deterministic") download schedule.
    
    We haven't meant to use it since we introduced the random
    exponential schedule.
    
    Closes ticket 23814.
---
 changes/refactor23814      |   4 +
 src/or/bridges.c           |   1 -
 src/or/control.c           |  39 +---
 src/or/directory.c         |  35 +---
 src/or/directory.h         |  11 +-
 src/or/networkstatus.c     |   8 +-
 src/or/or.h                |  14 --
 src/or/routerlist.c        |   1 -
 src/or/routerparse.c       |   1 -
 src/test/test_controller.c |  26 +--
 src/test/test_dir.c        | 440 +--------------------------------------------
 11 files changed, 46 insertions(+), 534 deletions(-)

diff --git a/changes/refactor23814 b/changes/refactor23814
new file mode 100644
index 000000000..75d84bfd1
--- /dev/null
+++ b/changes/refactor23814
@@ -0,0 +1,4 @@
+  o Code simplification and refactoring:
+    - Remove the old (deterministic) directory retry logic entirely:
+      We've used exponential backoff exclusively for some time.
+      Closes ticket 24814
diff --git a/src/or/bridges.c b/src/or/bridges.c
index 383c33fa6..3d9af21fa 100644
--- a/src/or/bridges.c
+++ b/src/or/bridges.c
@@ -458,7 +458,6 @@ bridge_add_from_config(bridge_line_t *bridge_line)
   if (bridge_line->transport_name)
     b->transport_name = bridge_line->transport_name;
   b->fetch_status.schedule = DL_SCHED_BRIDGE;
-  b->fetch_status.backoff = DL_SCHED_RANDOM_EXPONENTIAL;
   b->fetch_status.increment_on = DL_SCHED_INCREMENT_ATTEMPT;
   /* We can't reset the bridge's download status here, because UseBridges
    * might be 0 now, and it might be changed to 1 much later. */
diff --git a/src/or/control.c b/src/or/control.c
index cce5c7953..1cb6360c8 100644
--- a/src/or/control.c
+++ b/src/or/control.c
@@ -2252,7 +2252,7 @@ digest_list_to_string(const smartlist_t *sl)
 static char *
 download_status_to_string(const download_status_t *dl)
 {
-  char *rv = NULL, *tmp;
+  char *rv = NULL;
   char tbuf[ISO_TIME_LEN+1];
   const char *schedule_str, *want_authority_str;
   const char *increment_on_str, *backoff_str;
@@ -2300,49 +2300,28 @@ download_status_to_string(const download_status_t *dl)
         break;
     }
 
-    switch (dl->backoff) {
-      case DL_SCHED_DETERMINISTIC:
-        backoff_str = "DL_SCHED_DETERMINISTIC";
-        break;
-      case DL_SCHED_RANDOM_EXPONENTIAL:
-        backoff_str = "DL_SCHED_RANDOM_EXPONENTIAL";
-        break;
-      default:
-        backoff_str = "unknown";
-        break;
-    }
+    backoff_str = "DL_SCHED_RANDOM_EXPONENTIAL";
 
     /* Now assemble them */
-    tor_asprintf(&tmp,
+    tor_asprintf(&rv,
                  "next-attempt-at %s\n"
                  "n-download-failures %u\n"
                  "n-download-attempts %u\n"
                  "schedule %s\n"
                  "want-authority %s\n"
                  "increment-on %s\n"
-                 "backoff %s\n",
+                 "backoff %s\n"
+                 "last-backoff-position %u\n"
+                 "last-delay-used %d\n",
                  tbuf,
                  dl->n_download_failures,
                  dl->n_download_attempts,
                  schedule_str,
                  want_authority_str,
                  increment_on_str,
-                 backoff_str);
-
-    if (dl->backoff == DL_SCHED_RANDOM_EXPONENTIAL) {
-      /* Additional fields become relevant in random-exponential mode */
-      tor_asprintf(&rv,
-                   "%s"
-                   "last-backoff-position %u\n"
-                   "last-delay-used %d\n",
-                   tmp,
-                   dl->last_backoff_position,
-                   dl->last_delay_used);
-      tor_free(tmp);
-    } else {
-      /* That was it */
-      rv = tmp;
-    }
+                 backoff_str,
+                 dl->last_backoff_position,
+                 dl->last_delay_used);
   }
 
   return rv;
diff --git a/src/or/directory.c b/src/or/directory.c
index c55f81bc6..a2e514e79 100644
--- a/src/or/directory.c
+++ b/src/or/directory.c
@@ -5383,10 +5383,7 @@ find_dl_min_and_max_delay(download_status_t *dls, const or_options_t *options,
   *min = *((int *)(smartlist_get(schedule, 0)));
   /* Increment on failure schedules always use exponential backoff, but they
    * have a smaller limit when they're deterministic */
-  if (dls->backoff == DL_SCHED_DETERMINISTIC)
-    *max = *((int *)((smartlist_get(schedule, smartlist_len(schedule) - 1))));
-  else
-    *max = INT_MAX;
+  *max = INT_MAX;
 }
 
 /** As next_random_exponential_delay() below, but does not compute a random
@@ -5453,26 +5450,20 @@ next_random_exponential_delay(int delay,
   return MIN(rand_delay, max_delay);
 }
 
-/** Find the current delay for dls based on schedule or min_delay/
- * max_delay if we're using exponential backoff.  If dls->backoff is
- * DL_SCHED_RANDOM_EXPONENTIAL, we must have 0 <= min_delay <= max_delay <=
- * INT_MAX, but schedule may be set to NULL; otherwise schedule is required.
+/** Find the current delay for dls based on min_delay/
+ * max_delay. Requires that 0 <= min_delay <= max_delay <= INT_MAX.
+ *
  * This function sets dls->next_attempt_at based on now, and returns the delay.
  * Helper for download_status_increment_failure and
  * download_status_increment_attempt. */
 STATIC int
 download_status_schedule_get_delay(download_status_t *dls,
-                                   const smartlist_t *schedule,
                                    int min_delay, int max_delay,
                                    time_t now)
 {
   tor_assert(dls);
-  /* We don't need a schedule if we're using random exponential backoff */
-  tor_assert(dls->backoff == DL_SCHED_RANDOM_EXPONENTIAL ||
-             schedule != NULL);
   /* If we're using random exponential backoff, we do need min/max delay */
-  tor_assert(dls->backoff != DL_SCHED_RANDOM_EXPONENTIAL ||
-             (min_delay >= 0 && max_delay >= min_delay));
+  tor_assert(min_delay >= 0 && max_delay >= min_delay);
 
   int delay = INT_MAX;
   uint8_t dls_schedule_position = (dls->increment_on
@@ -5480,14 +5471,8 @@ download_status_schedule_get_delay(download_status_t *dls,
                                    ? dls->n_download_attempts
                                    : dls->n_download_failures);
 
-  if (dls->backoff == DL_SCHED_DETERMINISTIC) {
-    if (dls_schedule_position < smartlist_len(schedule))
-      delay = *(int *)smartlist_get(schedule, dls_schedule_position);
-    else if (dls_schedule_position == IMPOSSIBLE_TO_DOWNLOAD)
-      delay = INT_MAX;
-    else
-      delay = *(int *)smartlist_get(schedule, smartlist_len(schedule) - 1);
-  } else if (dls->backoff == DL_SCHED_RANDOM_EXPONENTIAL) {
+  { // XXXX 23814 unindent.
+
     /* Check if we missed a reset somehow */
     IF_BUG_ONCE(dls->last_backoff_position > dls_schedule_position) {
       dls->last_backoff_position = 0;
@@ -5603,9 +5588,8 @@ download_status_increment_failure(download_status_t *dls, int status_code,
 
     /* only return a failure retry time if this schedule increments on failures
      */
-    const smartlist_t *schedule = find_dl_schedule(dls, get_options());
     find_dl_min_and_max_delay(dls, get_options(), &min_delay, &max_delay);
-    increment = download_status_schedule_get_delay(dls, schedule,
+    increment = download_status_schedule_get_delay(dls,
                                                    min_delay, max_delay, now);
   }
 
@@ -5657,9 +5641,8 @@ download_status_increment_attempt(download_status_t *dls, const char *item,
   if (dls->n_download_attempts < IMPOSSIBLE_TO_DOWNLOAD-1)
     ++dls->n_download_attempts;
 
-  const smartlist_t *schedule = find_dl_schedule(dls, get_options());
   find_dl_min_and_max_delay(dls, get_options(), &min_delay, &max_delay);
-  delay = download_status_schedule_get_delay(dls, schedule,
+  delay = download_status_schedule_get_delay(dls,
                                              min_delay, max_delay, now);
 
   download_status_log_helper(item, dls->increment_on, "attempted",
diff --git a/src/or/directory.h b/src/or/directory.h
index edf75ffe1..6008d3a88 100644
--- a/src/or/directory.h
+++ b/src/or/directory.h
@@ -142,19 +142,13 @@ static inline int
 download_status_is_ready(download_status_t *dls, time_t now,
                          int max_failures)
 {
+  (void) max_failures; // 23814 REMOVE
+
   /* dls wasn't reset before it was used */
   if (dls->next_attempt_at == 0) {
     download_status_reset(dls);
   }
 
-  if (dls->backoff == DL_SCHED_DETERMINISTIC) {
-    /* Deterministic schedules can hit an endpoint; exponential backoff
-     * schedules just wait longer and longer. */
-    int under_failure_limit = (dls->n_download_failures <= max_failures
-                               && dls->n_download_attempts <= max_failures);
-    if (!under_failure_limit)
-      return 0;
-  }
   return download_status_get_next_attempt_at(dls) <= now;
 }
 
@@ -260,7 +254,6 @@ MOCK_DECL(STATIC int, directory_handle_command_post,(dir_connection_t *conn,
                                                      const char *body,
                                                      size_t body_len));
 STATIC int download_status_schedule_get_delay(download_status_t *dls,
-                                              const smartlist_t *schedule,
                                               int min_delay, int max_delay,
                                               time_t now);
 
diff --git a/src/or/networkstatus.c b/src/or/networkstatus.c
index aa0a8d15c..e051e41f5 100644
--- a/src/or/networkstatus.c
+++ b/src/or/networkstatus.c
@@ -106,9 +106,9 @@ static time_t time_to_download_next_consensus[N_CONSENSUS_FLAVORS];
 static download_status_t consensus_dl_status[N_CONSENSUS_FLAVORS] =
   {
     { 0, 0, 0, DL_SCHED_CONSENSUS, DL_WANT_ANY_DIRSERVER,
-      DL_SCHED_INCREMENT_FAILURE, DL_SCHED_RANDOM_EXPONENTIAL, 0, 0 },
+      DL_SCHED_INCREMENT_FAILURE, 0, 0 },
     { 0, 0, 0, DL_SCHED_CONSENSUS, DL_WANT_ANY_DIRSERVER,
-      DL_SCHED_INCREMENT_FAILURE, DL_SCHED_RANDOM_EXPONENTIAL, 0, 0 },
+      DL_SCHED_INCREMENT_FAILURE, 0, 0 },
   };
 
 #define N_CONSENSUS_BOOTSTRAP_SCHEDULES 2
@@ -125,10 +125,10 @@ static download_status_t
               consensus_bootstrap_dl_status[N_CONSENSUS_BOOTSTRAP_SCHEDULES] =
   {
     { 0, 0, 0, DL_SCHED_CONSENSUS, DL_WANT_AUTHORITY,
-      DL_SCHED_INCREMENT_ATTEMPT, DL_SCHED_RANDOM_EXPONENTIAL, 0, 0 },
+      DL_SCHED_INCREMENT_ATTEMPT, 0, 0 },
     /* During bootstrap, DL_WANT_ANY_DIRSERVER means "use fallbacks". */
     { 0, 0, 0, DL_SCHED_CONSENSUS, DL_WANT_ANY_DIRSERVER,
-      DL_SCHED_INCREMENT_ATTEMPT, DL_SCHED_RANDOM_EXPONENTIAL, 0, 0 },
+      DL_SCHED_INCREMENT_ATTEMPT, 0, 0 },
   };
 
 /** True iff we have logged a warning about this OR's version being older than
diff --git a/src/or/or.h b/src/or/or.h
index c81e29c95..f93050dfe 100644
--- a/src/or/or.h
+++ b/src/or/or.h
@@ -2069,15 +2069,6 @@ typedef enum {
 #define download_schedule_increment_bitfield_t \
                                         ENUM_BF(download_schedule_increment_t)
 
-/** Enumeration: do we want to use the random exponential backoff
- * mechanism? */
-typedef enum {
-  DL_SCHED_DETERMINISTIC = 0,
-  DL_SCHED_RANDOM_EXPONENTIAL = 1,
-} download_schedule_backoff_t;
-#define download_schedule_backoff_bitfield_t \
-                                        ENUM_BF(download_schedule_backoff_t)
-
 /** Information about our plans for retrying downloads for a downloadable
  * directory object.
  * Each type of downloadable directory object has a corresponding retry
@@ -2124,11 +2115,6 @@ typedef struct download_status_t {
   download_schedule_increment_bitfield_t increment_on : 1; /**< does this
                                         * schedule increment on each attempt,
                                         * or after each failure? */
-  download_schedule_backoff_bitfield_t backoff : 1; /**< do we use the
-                                        * deterministic schedule, or random
-                                        * exponential backoffs?
-                                        * Increment on failure schedules
-                                        * always use exponential backoff. */
   uint8_t last_backoff_position; /**< number of attempts/failures, depending
                                   * on increment_on, when we last recalculated
                                   * the delay.  Only updated if backoff
diff --git a/src/or/routerlist.c b/src/or/routerlist.c
index 2815c6096..fec224fad 100644
--- a/src/or/routerlist.c
+++ b/src/or/routerlist.c
@@ -246,7 +246,6 @@ download_status_cert_init(download_status_t *dlstatus)
   dlstatus->schedule = DL_SCHED_CONSENSUS;
   dlstatus->want_authority = DL_WANT_ANY_DIRSERVER;
   dlstatus->increment_on = DL_SCHED_INCREMENT_FAILURE;
-  dlstatus->backoff = DL_SCHED_RANDOM_EXPONENTIAL;
   dlstatus->last_backoff_position = 0;
   dlstatus->last_delay_used = 0;
 
diff --git a/src/or/routerparse.c b/src/or/routerparse.c
index f1895ce31..e25860a67 100644
--- a/src/or/routerparse.c
+++ b/src/or/routerparse.c
@@ -3781,7 +3781,6 @@ networkstatus_parse_vote_from_string(const char *s, const char **eos_out,
                                                      ns->consensus_method,
                                                      flav))) {
         /* Use exponential-backoff scheduling when downloading microdescs */
-        rs->dl_status.backoff = DL_SCHED_RANDOM_EXPONENTIAL;
         smartlist_add(ns->routerstatus_list, rs);
       }
     }
diff --git a/src/test/test_controller.c b/src/test/test_controller.c
index af19f63f6..1c285bb3a 100644
--- a/src/test/test_controller.c
+++ b/src/test/test_controller.c
@@ -396,7 +396,7 @@ test_add_onion_helper_clientauth(void *arg)
 
 static const download_status_t dl_status_default =
   { 0, 0, 0, DL_SCHED_CONSENSUS, DL_WANT_ANY_DIRSERVER,
-    DL_SCHED_INCREMENT_FAILURE, DL_SCHED_RANDOM_EXPONENTIAL, 0, 0 };
+    DL_SCHED_INCREMENT_FAILURE, 0, 0 };
 static download_status_t ns_dl_status[N_CONSENSUS_FLAVORS];
 static download_status_t ns_dl_status_bootstrap[N_CONSENSUS_FLAVORS];
 static download_status_t ns_dl_status_running[N_CONSENSUS_FLAVORS];
@@ -407,7 +407,7 @@ static download_status_t ns_dl_status_running[N_CONSENSUS_FLAVORS];
  */
 static const download_status_t dls_sample_1 =
   { 1467163900, 0, 0, DL_SCHED_GENERIC, DL_WANT_ANY_DIRSERVER,
-    DL_SCHED_INCREMENT_FAILURE, DL_SCHED_DETERMINISTIC, 0, 0 };
+    DL_SCHED_INCREMENT_FAILURE, 0, 0 };
 static const char * dls_sample_1_str =
     "next-attempt-at 2016-06-29 01:31:40\n"
     "n-download-failures 0\n"
@@ -415,10 +415,12 @@ static const char * dls_sample_1_str =
     "schedule DL_SCHED_GENERIC\n"
     "want-authority DL_WANT_ANY_DIRSERVER\n"
     "increment-on DL_SCHED_INCREMENT_FAILURE\n"
-    "backoff DL_SCHED_DETERMINISTIC\n";
+    "backoff DL_SCHED_RANDOM_EXPONENTIAL\n"
+    "last-backoff-position 0\n"
+    "last-delay-used 0\n";
 static const download_status_t dls_sample_2 =
   { 1467164400, 1, 2, DL_SCHED_CONSENSUS, DL_WANT_AUTHORITY,
-    DL_SCHED_INCREMENT_FAILURE, DL_SCHED_DETERMINISTIC, 0, 0 };
+    DL_SCHED_INCREMENT_FAILURE, 0, 0 };
 static const char * dls_sample_2_str =
     "next-attempt-at 2016-06-29 01:40:00\n"
     "n-download-failures 1\n"
@@ -426,10 +428,12 @@ static const char * dls_sample_2_str =
     "schedule DL_SCHED_CONSENSUS\n"
     "want-authority DL_WANT_AUTHORITY\n"
     "increment-on DL_SCHED_INCREMENT_FAILURE\n"
-    "backoff DL_SCHED_DETERMINISTIC\n";
+    "backoff DL_SCHED_RANDOM_EXPONENTIAL\n"
+    "last-backoff-position 0\n"
+    "last-delay-used 0\n";
 static const download_status_t dls_sample_3 =
   { 1467154400, 12, 25, DL_SCHED_BRIDGE, DL_WANT_ANY_DIRSERVER,
-    DL_SCHED_INCREMENT_ATTEMPT, DL_SCHED_DETERMINISTIC, 0, 0 };
+    DL_SCHED_INCREMENT_ATTEMPT, 0, 0 };
 static const char * dls_sample_3_str =
     "next-attempt-at 2016-06-28 22:53:20\n"
     "n-download-failures 12\n"
@@ -437,10 +441,12 @@ static const char * dls_sample_3_str =
     "schedule DL_SCHED_BRIDGE\n"
     "want-authority DL_WANT_ANY_DIRSERVER\n"
     "increment-on DL_SCHED_INCREMENT_ATTEMPT\n"
-    "backoff DL_SCHED_DETERMINISTIC\n";
+    "backoff DL_SCHED_RANDOM_EXPONENTIAL\n"
+    "last-backoff-position 0\n"
+    "last-delay-used 0\n";
 static const download_status_t dls_sample_4 =
   { 1467166600, 3, 0, DL_SCHED_GENERIC, DL_WANT_ANY_DIRSERVER,
-    DL_SCHED_INCREMENT_FAILURE, DL_SCHED_RANDOM_EXPONENTIAL, 0, 0 };
+    DL_SCHED_INCREMENT_FAILURE, 0, 0 };
 static const char * dls_sample_4_str =
     "next-attempt-at 2016-06-29 02:16:40\n"
     "n-download-failures 3\n"
@@ -453,7 +459,7 @@ static const char * dls_sample_4_str =
     "last-delay-used 0\n";
 static const download_status_t dls_sample_5 =
   { 1467164600, 3, 7, DL_SCHED_CONSENSUS, DL_WANT_ANY_DIRSERVER,
-    DL_SCHED_INCREMENT_FAILURE, DL_SCHED_RANDOM_EXPONENTIAL, 1, 2112, };
+    DL_SCHED_INCREMENT_FAILURE, 1, 2112, };
 static const char * dls_sample_5_str =
     "next-attempt-at 2016-06-29 01:43:20\n"
     "n-download-failures 3\n"
@@ -466,7 +472,7 @@ static const char * dls_sample_5_str =
     "last-delay-used 2112\n";
 static const download_status_t dls_sample_6 =
   { 1467164200, 4, 9, DL_SCHED_CONSENSUS, DL_WANT_AUTHORITY,
-    DL_SCHED_INCREMENT_ATTEMPT, DL_SCHED_RANDOM_EXPONENTIAL, 3, 432 };
+    DL_SCHED_INCREMENT_ATTEMPT, 3, 432 };
 static const char * dls_sample_6_str =
     "next-attempt-at 2016-06-29 01:36:40\n"
     "n-download-failures 4\n"
diff --git a/src/test/test_dir.c b/src/test/test_dir.c
index f2223ee17..dc8d2a3bc 100644
--- a/src/test/test_dir.c
+++ b/src/test/test_dir.c
@@ -3965,164 +3965,11 @@ test_dir_packages(void *arg)
 }
 
 static void
-test_dir_download_status_schedule(void *arg)
-{
-  (void)arg;
-  download_status_t dls_failure = { 0, 0, 0, DL_SCHED_GENERIC,
-                                             DL_WANT_AUTHORITY,
-                                             DL_SCHED_INCREMENT_FAILURE,
-                                             DL_SCHED_DETERMINISTIC, 0, 0 };
-  download_status_t dls_attempt = { 0, 0, 0, DL_SCHED_CONSENSUS,
-                                             DL_WANT_ANY_DIRSERVER,
-                                             DL_SCHED_INCREMENT_ATTEMPT,
-                                             DL_SCHED_DETERMINISTIC, 0, 0 };
-  download_status_t dls_bridge  = { 0, 0, 0, DL_SCHED_BRIDGE,
-                                             DL_WANT_AUTHORITY,
-                                             DL_SCHED_INCREMENT_FAILURE,
-                                             DL_SCHED_DETERMINISTIC, 0, 0 };
-  int increment = -1;
-  int expected_increment = -1;
-  time_t current_time = time(NULL);
-  int delay1 = -1;
-  int delay2 = -1;
-  smartlist_t *schedule = smartlist_new();
-
-  /* Make a dummy schedule */
-  smartlist_add(schedule, (void *)&delay1);
-  smartlist_add(schedule, (void *)&delay2);
-
-  /* check a range of values */
-  delay1 = 1000;
-  increment = download_status_schedule_get_delay(&dls_failure,
-                                                 schedule,
-                                                 0, INT_MAX,
-                                                 TIME_MIN);
-  expected_increment = delay1;
-  tt_assert(increment == expected_increment);
-  tt_assert(dls_failure.next_attempt_at == TIME_MIN + expected_increment);
-
-  delay1 = INT_MAX;
-  increment =  download_status_schedule_get_delay(&dls_failure,
-                                                  schedule,
-                                                  0, INT_MAX,
-                                                  -1);
-  expected_increment = delay1;
-  tt_assert(increment == expected_increment);
-  tt_assert(dls_failure.next_attempt_at == TIME_MAX);
-
-  delay1 = 0;
-  increment = download_status_schedule_get_delay(&dls_attempt,
-                                                 schedule,
-                                                 0, INT_MAX,
-                                                 0);
-  expected_increment = delay1;
-  tt_assert(increment == expected_increment);
-  tt_assert(dls_attempt.next_attempt_at == 0 + expected_increment);
-
-  delay1 = 1000;
-  increment = download_status_schedule_get_delay(&dls_attempt,
-                                                 schedule,
-                                                 0, INT_MAX,
-                                                 1);
-  expected_increment = delay1;
-  tt_assert(increment == expected_increment);
-  tt_assert(dls_attempt.next_attempt_at == 1 + expected_increment);
-
-  delay1 = INT_MAX;
-  increment = download_status_schedule_get_delay(&dls_bridge,
-                                                 schedule,
-                                                 0, INT_MAX,
-                                                 current_time);
-  expected_increment = delay1;
-  tt_assert(increment == expected_increment);
-  tt_assert(dls_bridge.next_attempt_at == TIME_MAX);
-
-  delay1 = 1;
-  increment = download_status_schedule_get_delay(&dls_bridge,
-                                                 schedule,
-                                                 0, INT_MAX,
-                                                 TIME_MAX);
-  expected_increment = delay1;
-  tt_assert(increment == expected_increment);
-  tt_assert(dls_bridge.next_attempt_at == TIME_MAX);
-
-  /* see what happens when we reach the end */
-  dls_attempt.n_download_attempts++;
-  dls_bridge.n_download_failures++;
-
-  delay2 = 100;
-  increment = download_status_schedule_get_delay(&dls_attempt,
-                                                 schedule,
-                                                 0, INT_MAX,
-                                                 current_time);
-  expected_increment = delay2;
-  tt_assert(increment == expected_increment);
-  tt_assert(dls_attempt.next_attempt_at == current_time + delay2);
-
-  delay2 = 1;
-  increment = download_status_schedule_get_delay(&dls_bridge,
-                                                 schedule,
-                                                 0, INT_MAX,
-                                                 current_time);
-  expected_increment = delay2;
-  tt_assert(increment == expected_increment);
-  tt_assert(dls_bridge.next_attempt_at == current_time + delay2);
-
-  /* see what happens when we try to go off the end */
-  dls_attempt.n_download_attempts++;
-  dls_bridge.n_download_failures++;
-
-  delay2 = 5;
-  increment = download_status_schedule_get_delay(&dls_attempt,
-                                                 schedule,
-                                                 0, INT_MAX,
-                                                 current_time);
-  expected_increment = delay2;
-  tt_assert(increment == expected_increment);
-  tt_assert(dls_attempt.next_attempt_at == current_time + delay2);
-
-  delay2 = 17;
-  increment = download_status_schedule_get_delay(&dls_bridge,
-                                                 schedule,
-                                                 0, INT_MAX,
-                                                 current_time);
-  expected_increment = delay2;
-  tt_assert(increment == expected_increment);
-  tt_assert(dls_bridge.next_attempt_at == current_time + delay2);
-
-  /* see what happens when we reach IMPOSSIBLE_TO_DOWNLOAD */
-  dls_attempt.n_download_attempts = IMPOSSIBLE_TO_DOWNLOAD;
-  dls_bridge.n_download_failures = IMPOSSIBLE_TO_DOWNLOAD;
-
-  delay2 = 35;
-  increment = download_status_schedule_get_delay(&dls_attempt,
-                                                 schedule,
-                                                 0, INT_MAX,
-                                                 current_time);
-  expected_increment = INT_MAX;
-  tt_assert(increment == expected_increment);
-  tt_assert(dls_attempt.next_attempt_at == TIME_MAX);
-
-  delay2 = 99;
-  increment = download_status_schedule_get_delay(&dls_bridge,
-                                                 schedule,
-                                                 0, INT_MAX,
-                                                 current_time);
-  expected_increment = INT_MAX;
-  tt_assert(increment == expected_increment);
-  tt_assert(dls_bridge.next_attempt_at == TIME_MAX);
-
- done:
-  /* the pointers in schedule are allocated on the stack */
-  smartlist_free(schedule);
-}
-
-static void
 download_status_random_backoff_helper(int min_delay, int max_delay)
 {
   download_status_t dls_random =
     { 0, 0, 0, DL_SCHED_GENERIC, DL_WANT_AUTHORITY,
-               DL_SCHED_INCREMENT_FAILURE, DL_SCHED_RANDOM_EXPONENTIAL, 0, 0 };
+               DL_SCHED_INCREMENT_FAILURE, 0, 0 };
   int increment = -1;
   int old_increment = -1;
   time_t current_time = time(NULL);
@@ -4131,7 +3978,6 @@ download_status_random_backoff_helper(int min_delay, int max_delay)
   int n_attempts = 0;
   do {
     increment = download_status_schedule_get_delay(&dls_random,
-                                                   NULL,
                                                    min_delay, max_delay,
                                                    current_time);
 
@@ -4220,18 +4066,10 @@ static void
 test_dir_download_status_increment(void *arg)
 {
   (void)arg;
-  download_status_t dls_failure = { 0, 0, 0, DL_SCHED_GENERIC,
-    DL_WANT_AUTHORITY,
-    DL_SCHED_INCREMENT_FAILURE,
-    DL_SCHED_DETERMINISTIC, 0, 0 };
-  download_status_t dls_attempt = { 0, 0, 0, DL_SCHED_BRIDGE,
-    DL_WANT_ANY_DIRSERVER,
-    DL_SCHED_INCREMENT_ATTEMPT,
-    DL_SCHED_DETERMINISTIC, 0, 0 };
   download_status_t dls_exp = { 0, 0, 0, DL_SCHED_GENERIC,
     DL_WANT_ANY_DIRSERVER,
     DL_SCHED_INCREMENT_ATTEMPT,
-    DL_SCHED_RANDOM_EXPONENTIAL, 0, 0 };
+    0, 0 };
   int no_delay = 0;
   int delay0 = -1;
   int delay1 = -1;
@@ -4239,7 +4077,6 @@ test_dir_download_status_increment(void *arg)
   smartlist_t *schedule = smartlist_new();
   smartlist_t *schedule_no_initial_delay = smartlist_new();
   or_options_t test_options;
-  time_t next_at = TIME_MAX;
   time_t current_time = time(NULL);
 
   /* Provide some values for the schedules */
@@ -4272,26 +4109,6 @@ test_dir_download_status_increment(void *arg)
   mock_get_options_calls = 0;
   /* we really want to test that it's equal to time(NULL) + delay0, but that's
    * an unrealiable test, because time(NULL) might change. */
-  tt_assert(download_status_get_next_attempt_at(&dls_failure)
-            >= current_time + no_delay);
-  tt_assert(download_status_get_next_attempt_at(&dls_failure)
-            != TIME_MAX);
-  tt_int_op(download_status_get_n_failures(&dls_failure), OP_EQ, 0);
-  tt_int_op(download_status_get_n_attempts(&dls_failure), OP_EQ, 0);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  /* regression test for 17750: initial delay */
-  mock_options->TestingClientDownloadSchedule = schedule;
-  mock_get_options_calls = 0;
-  /* we really want to test that it's equal to time(NULL) + delay0, but that's
-   * an unrealiable test, because time(NULL) might change. */
-  tt_assert(download_status_get_next_attempt_at(&dls_failure)
-            >= current_time + delay0);
-  tt_assert(download_status_get_next_attempt_at(&dls_failure)
-            != TIME_MAX);
-  tt_int_op(download_status_get_n_failures(&dls_failure), OP_EQ, 0);
-  tt_int_op(download_status_get_n_attempts(&dls_failure), OP_EQ, 0);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
 
   /* regression test for 17750: exponential, no initial delay */
   mock_options->TestingClientDownloadSchedule = schedule_no_initial_delay;
@@ -4319,258 +4136,6 @@ test_dir_download_status_increment(void *arg)
   tt_int_op(download_status_get_n_attempts(&dls_exp), OP_EQ, 0);
   tt_int_op(mock_get_options_calls, OP_GE, 1);
 
-  /* Check that a failure reset works */
-  mock_get_options_calls = 0;
-  download_status_reset(&dls_failure);
-  /* we really want to test that it's equal to time(NULL) + delay0, but that's
-   * an unrealiable test, because time(NULL) might change. */
-  tt_assert(download_status_get_next_attempt_at(&dls_failure)
-            >= current_time + delay0);
-  tt_assert(download_status_get_next_attempt_at(&dls_failure)
-            != TIME_MAX);
-  tt_int_op(download_status_get_n_failures(&dls_failure), OP_EQ, 0);
-  tt_int_op(download_status_get_n_attempts(&dls_failure), OP_EQ, 0);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  /* avoid timing inconsistencies */
-  dls_failure.next_attempt_at = current_time + delay0;
-
-  /* check that a reset schedule becomes ready at the right time */
-  tt_int_op(download_status_is_ready(&dls_failure,
-                                     current_time + delay0 - 1, 1),
-            OP_EQ, 0);
-  tt_int_op(download_status_is_ready(&dls_failure,
-                                     current_time + delay0, 1),
-            OP_EQ, 1);
-  tt_int_op(download_status_is_ready(&dls_failure,
-                                     current_time + delay0 + 1, 1),
-            OP_EQ, 1);
-
-  /* Check that a failure increment works */
-  mock_get_options_calls = 0;
-  next_at = download_status_increment_failure(&dls_failure, 404, "test", 0,
-                                              current_time);
-  tt_assert(next_at == current_time + delay1);
-  tt_int_op(download_status_get_n_failures(&dls_failure), OP_EQ, 1);
-  tt_int_op(download_status_get_n_attempts(&dls_failure), OP_EQ, 1);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  /* check that an incremented schedule becomes ready at the right time */
-  tt_int_op(download_status_is_ready(&dls_failure,
-                                     current_time + delay1 - 1, 1),
-            OP_EQ, 0);
-  tt_int_op(download_status_is_ready(&dls_failure,
-                                     current_time + delay1, 1),
-            OP_EQ, 1);
-  tt_int_op(download_status_is_ready(&dls_failure,
-                                     current_time + delay1 + 1, 1),
-            OP_EQ, 1);
-
-  /* check that a schedule isn't ready if it's had too many failures */
-  tt_int_op(download_status_is_ready(&dls_failure,
-                                     current_time + delay1 + 10, 0),
-            OP_EQ, 0);
-
-  /* Check that failure increments do happen on 503 for clients, and
-   * attempt increments do too. */
-  mock_get_options_calls = 0;
-  next_at = download_status_increment_failure(&dls_failure, 503, "test", 0,
-                                              current_time);
-  tt_i64_op(next_at, OP_EQ, current_time + delay2);
-  tt_int_op(download_status_get_n_failures(&dls_failure), OP_EQ, 2);
-  tt_int_op(download_status_get_n_attempts(&dls_failure), OP_EQ, 2);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  /* Check that failure increments do happen on 503 for servers */
-  mock_get_options_calls = 0;
-  next_at = download_status_increment_failure(&dls_failure, 503, "test", 1,
-                                              current_time);
-  tt_assert(next_at == current_time + delay2);
-  tt_int_op(download_status_get_n_failures(&dls_failure), OP_EQ, 3);
-  tt_int_op(download_status_get_n_attempts(&dls_failure), OP_EQ, 3);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  /* Check what happens when we run off the end of the schedule */
-  mock_get_options_calls = 0;
-  next_at = download_status_increment_failure(&dls_failure, 404, "test", 0,
-                                              current_time);
-  tt_assert(next_at == current_time + delay2);
-  tt_int_op(download_status_get_n_failures(&dls_failure), OP_EQ, 4);
-  tt_int_op(download_status_get_n_attempts(&dls_failure), OP_EQ, 4);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  /* Check what happens when we hit the failure limit */
-  mock_get_options_calls = 0;
-  download_status_mark_impossible(&dls_failure);
-  next_at = download_status_increment_failure(&dls_failure, 404, "test", 0,
-                                              current_time);
-  tt_assert(next_at == TIME_MAX);
-  tt_int_op(download_status_get_n_failures(&dls_failure), OP_EQ,
-            IMPOSSIBLE_TO_DOWNLOAD);
-  tt_int_op(download_status_get_n_attempts(&dls_failure), OP_EQ,
-            IMPOSSIBLE_TO_DOWNLOAD);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  /* Check that a failure reset doesn't reset at the limit */
-  mock_get_options_calls = 0;
-  download_status_reset(&dls_failure);
-  tt_assert(download_status_get_next_attempt_at(&dls_failure)
-            == TIME_MAX);
-  tt_int_op(download_status_get_n_failures(&dls_failure), OP_EQ,
-            IMPOSSIBLE_TO_DOWNLOAD);
-  tt_int_op(download_status_get_n_attempts(&dls_failure), OP_EQ,
-            IMPOSSIBLE_TO_DOWNLOAD);
-  tt_int_op(mock_get_options_calls, OP_EQ, 0);
-
-  /* Check that a failure reset resets just before the limit */
-  mock_get_options_calls = 0;
-  dls_failure.n_download_failures = IMPOSSIBLE_TO_DOWNLOAD - 1;
-  dls_failure.n_download_attempts = IMPOSSIBLE_TO_DOWNLOAD - 1;
-  download_status_reset(&dls_failure);
-  /* we really want to test that it's equal to time(NULL) + delay0, but that's
-   * an unrealiable test, because time(NULL) might change. */
-  tt_assert(download_status_get_next_attempt_at(&dls_failure)
-            >= current_time + delay0);
-  tt_assert(download_status_get_next_attempt_at(&dls_failure)
-            != TIME_MAX);
-  tt_int_op(download_status_get_n_failures(&dls_failure), OP_EQ, 0);
-  tt_int_op(download_status_get_n_attempts(&dls_failure), OP_EQ, 0);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  /* Check that failure increments do happen on attempt-based schedules,
-   * but that the retry is set at the end of time */
-  mock_options->UseBridges = 1;
-  mock_get_options_calls = 0;
-  next_at = download_status_increment_failure(&dls_attempt, 404, "test", 0,
-                                              current_time);
-  tt_assert(next_at == TIME_MAX);
-  tt_int_op(download_status_get_n_failures(&dls_attempt), OP_EQ, 1);
-  tt_int_op(download_status_get_n_attempts(&dls_attempt), OP_EQ, 0);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  /* Check that an attempt reset works */
-  mock_get_options_calls = 0;
-  download_status_reset(&dls_attempt);
-  /* we really want to test that it's equal to time(NULL) + delay0, but that's
-   * an unrealiable test, because time(NULL) might change. */
-  tt_assert(download_status_get_next_attempt_at(&dls_attempt)
-            >= current_time + delay0);
-  tt_assert(download_status_get_next_attempt_at(&dls_attempt)
-            != TIME_MAX);
-  tt_int_op(download_status_get_n_failures(&dls_attempt), OP_EQ, 0);
-  tt_int_op(download_status_get_n_attempts(&dls_attempt), OP_EQ, 0);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  /* avoid timing inconsistencies */
-  dls_attempt.next_attempt_at = current_time + delay0;
-
-  /* check that a reset schedule becomes ready at the right time */
-  tt_int_op(download_status_is_ready(&dls_attempt,
-                                     current_time + delay0 - 1, 1),
-            OP_EQ, 0);
-  tt_int_op(download_status_is_ready(&dls_attempt,
-                                     current_time + delay0, 1),
-            OP_EQ, 1);
-  tt_int_op(download_status_is_ready(&dls_attempt,
-                                     current_time + delay0 + 1, 1),
-            OP_EQ, 1);
-
-  /* Check that an attempt increment works */
-  mock_get_options_calls = 0;
-  next_at = download_status_increment_attempt(&dls_attempt, "test",
-                                              current_time);
-  tt_assert(next_at == current_time + delay1);
-  tt_int_op(download_status_get_n_failures(&dls_attempt), OP_EQ, 0);
-  tt_int_op(download_status_get_n_attempts(&dls_attempt), OP_EQ, 1);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  /* check that an incremented schedule becomes ready at the right time */
-  tt_int_op(download_status_is_ready(&dls_attempt,
-                                     current_time + delay1 - 1, 1),
-            OP_EQ, 0);
-  tt_int_op(download_status_is_ready(&dls_attempt,
-                                     current_time + delay1, 1),
-            OP_EQ, 1);
-  tt_int_op(download_status_is_ready(&dls_attempt,
-                                     current_time + delay1 + 1, 1),
-            OP_EQ, 1);
-
-  /* check that a schedule isn't ready if it's had too many attempts */
-  tt_int_op(download_status_is_ready(&dls_attempt,
-                                     current_time + delay1 + 10, 0),
-            OP_EQ, 0);
-
-  /* Check what happens when we reach then run off the end of the schedule */
-  mock_get_options_calls = 0;
-  next_at = download_status_increment_attempt(&dls_attempt, "test",
-                                              current_time);
-  tt_assert(next_at == current_time + delay2);
-  tt_int_op(download_status_get_n_failures(&dls_attempt), OP_EQ, 0);
-  tt_int_op(download_status_get_n_attempts(&dls_attempt), OP_EQ, 2);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  mock_get_options_calls = 0;
-  next_at = download_status_increment_attempt(&dls_attempt, "test",
-                                              current_time);
-  tt_assert(next_at == current_time + delay2);
-  tt_int_op(download_status_get_n_failures(&dls_attempt), OP_EQ, 0);
-  tt_int_op(download_status_get_n_attempts(&dls_attempt), OP_EQ, 3);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  /* Check what happens when we hit the attempt limit */
-  mock_get_options_calls = 0;
-  download_status_mark_impossible(&dls_attempt);
-  next_at = download_status_increment_attempt(&dls_attempt, "test",
-                                              current_time);
-  tt_assert(next_at == TIME_MAX);
-  tt_int_op(download_status_get_n_failures(&dls_attempt), OP_EQ,
-            IMPOSSIBLE_TO_DOWNLOAD);
-  tt_int_op(download_status_get_n_attempts(&dls_attempt), OP_EQ,
-            IMPOSSIBLE_TO_DOWNLOAD);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-
-  /* Check that an attempt reset doesn't reset at the limit */
-  mock_get_options_calls = 0;
-  download_status_reset(&dls_attempt);
-  tt_assert(download_status_get_next_attempt_at(&dls_attempt)
-            == TIME_MAX);
-  tt_int_op(download_status_get_n_failures(&dls_attempt), OP_EQ,
-            IMPOSSIBLE_TO_DOWNLOAD);
-  tt_int_op(download_status_get_n_attempts(&dls_attempt), OP_EQ,
-            IMPOSSIBLE_TO_DOWNLOAD);
-  tt_int_op(mock_get_options_calls, OP_EQ, 0);
-
-  /* Check that an attempt reset resets just before the limit */
-  mock_get_options_calls = 0;
-  dls_attempt.n_download_failures = IMPOSSIBLE_TO_DOWNLOAD - 1;
-  dls_attempt.n_download_attempts = IMPOSSIBLE_TO_DOWNLOAD - 1;
-  download_status_reset(&dls_attempt);
-  /* we really want to test that it's equal to time(NULL) + delay0, but that's
-   * an unrealiable test, because time(NULL) might change. */
-  tt_assert(download_status_get_next_attempt_at(&dls_attempt)
-            >= current_time + delay0);
-  tt_assert(download_status_get_next_attempt_at(&dls_attempt)
-            != TIME_MAX);
-  tt_int_op(download_status_get_n_failures(&dls_attempt), OP_EQ, 0);
-  tt_int_op(download_status_get_n_attempts(&dls_attempt), OP_EQ, 0);
-  tt_int_op(mock_get_options_calls, OP_GE, 1);
-  mock_options->UseBridges = 0;
-
-  /* Check that attempt increments don't happen on failure-based schedules,
-   * and that the attempt is set at the end of time */
-  mock_get_options_calls = 0;
-  setup_full_capture_of_logs(LOG_WARN);
-  next_at = download_status_increment_attempt(&dls_failure, "test",
-                                              current_time);
-  expect_single_log_msg_containing(
-    "Tried to launch an attempt-based connection on a failure-based "
-    "schedule.");
-  teardown_capture_of_logs();
-  tt_assert(next_at == TIME_MAX);
-  tt_int_op(download_status_get_n_failures(&dls_failure), OP_EQ, 0);
-  tt_int_op(download_status_get_n_attempts(&dls_failure), OP_EQ, 0);
-  tt_int_op(mock_get_options_calls, OP_EQ, 0);
-
  done:
   /* the pointers in schedule are allocated on the stack */
   smartlist_free(schedule);
@@ -6318,7 +5883,6 @@ struct testcase_t dir_tests[] = {
   DIR(post_parsing, 0),
   DIR(fetch_type, 0),
   DIR(packages, 0),
-  DIR(download_status_schedule, 0),
   DIR(download_status_random_backoff, 0),
   DIR(download_status_random_backoff_ranges, 0),
   DIR(download_status_increment, TT_FORK),



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