fix idle transaction issue introduced earlier

src/exchange/taler-exchange-wirewatch.c

@@ -362,6 +362,7 @@ static void
 handle_soft_error (struct WireAccount *wa)
 {
   db_plugin->rollback (db_plugin->cls);
+  wa->started_transaction = false;
   if (1 < wa->batch_size)
   {
     wa->batch_thresh = wa->batch_size;
@@ -376,6 +377,89 @@ handle_soft_error (struct WireAccount *wa)
 }
 
 
+/**
+ * We are done with a shard, move on to the next one.
+ *
+ * @param wa wire account for which we completed a shard
+ */
+static void
+shard_completed (struct WireAccount *wa)
+{
+  /* transaction success, update #last_row_off */
+  wa->batch_start = wa->latest_row_off;
+  if (wa->batch_size < MAXIMUM_BATCH_SIZE)
+  {
+    int delta;
+
+    delta = ((int) wa->batch_thresh - (int) wa->batch_size) / 4;
+    if (delta < 0)
+      delta = -delta;
+    wa->batch_size = GNUNET_MIN (MAXIMUM_BATCH_SIZE,
+                                 wa->batch_size + delta + 1);
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "Increasing batch size to %llu\n",
+                (unsigned long long) wa->batch_size);
+  }
+  if (wa->delay)
+  {
+    wa->delayed_until
+      = GNUNET_TIME_relative_to_absolute (wirewatch_idle_sleep_interval);
+    wa_pos = wa_pos->next;
+    if (NULL == wa_pos)
+      wa_pos = wa_head;
+    GNUNET_assert (NULL != wa_pos);
+  }
+  GNUNET_assert (NULL == task);
+  task = GNUNET_SCHEDULER_add_at (wa_pos->delayed_until,
+                                  &find_transfers,
+                                  NULL);
+}
+
+
+/**
+ * We are finished with the current shard. Update the database, marking the
+ * shard as finished.
+ *
+ * @param wa wire account to commit for
+ * @return true on success
+ */
+static bool
+mark_shard_done (struct WireAccount *wa)
+{
+  enum GNUNET_DB_QueryStatus qs;
+
+  if (wa->shard_end > wa->latest_row_off)
+    return false; /* actually, not done! */
+  /* shard is complete, mark this as well */
+  qs = db_plugin->complete_shard (db_plugin->cls,
+                                  wa->job_name,
+                                  wa->shard_start,
+                                  wa->shard_end);
+  switch (qs)
+  {
+  case GNUNET_DB_STATUS_HARD_ERROR:
+    GNUNET_break (0);
+    db_plugin->rollback (db_plugin->cls);
+    GNUNET_SCHEDULER_shutdown ();
+    return false;
+  case GNUNET_DB_STATUS_SOFT_ERROR:
+    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+                "Got DB soft error for complete_shard. Rolling back.\n");
+    handle_soft_error (wa);
+    return false;
+  case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
+    /* already existed, ok, let's just continue */
+    break;
+  case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
+    /* normal case */
+    shard_delay = GNUNET_TIME_absolute_get_duration (wa->shard_start_time);
+
+    break;
+  }
+  return true;
+}
+
+
 /**
  * We are finished with the current transaction, try
  * to commit and then schedule the next iteration.
@@ -387,35 +471,8 @@ do_commit (struct WireAccount *wa)
 {
   enum GNUNET_DB_QueryStatus qs;
 
-  if (wa->shard_end <= wa->latest_row_off)
+  wa->started_transaction = false;
-  {
+  mark_shard_done (wa);
-    /* shard is complete, mark this as well */
-    qs = db_plugin->complete_shard (db_plugin->cls,
-                                    wa->job_name,
-                                    wa->shard_start,
-                                    wa->shard_end);
-    switch (qs)
-    {
-    case GNUNET_DB_STATUS_HARD_ERROR:
-      GNUNET_break (0);
-      db_plugin->rollback (db_plugin->cls);
-      GNUNET_SCHEDULER_shutdown ();
-      return;
-    case GNUNET_DB_STATUS_SOFT_ERROR:
-      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
-                  "Got DB soft error for complete_shard. Rolling back.\n");
-      handle_soft_error (wa);
-      return;
-    case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
-      /* already existed, ok, let's just continue */
-      break;
-    case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
-      /* normal case */
-      shard_delay = GNUNET_TIME_absolute_get_duration (wa->shard_start_time);
-
-      break;
-    }
-  }
   qs = db_plugin->commit (db_plugin->cls);
   switch (qs)
   {
@@ -432,43 +489,7 @@ do_commit (struct WireAccount *wa)
     /* normal case */
     break;
   }
-  /* transaction success, update #last_row_off */
+  shard_completed (wa);
-  wa->batch_start = wa->latest_row_off;
-  if (wa->batch_size < MAXIMUM_BATCH_SIZE)
-  {
-    int delta;
-
-    delta = ((int) wa->batch_thresh - (int) wa->batch_size) / 4;
-    if (delta < 0)
-      delta = -delta;
-    wa->batch_size = GNUNET_MIN (MAXIMUM_BATCH_SIZE,
-                                 wa->batch_size + delta + 1);
-    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-                "Increasing batch size to %llu\n",
-                (unsigned long long) wa->batch_size);
-  }
-  if ( (wa->delay) &&
-       (test_mode) &&
-       (NULL == wa->next) )
-  {
-    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
-                "Shutdown due to test mode!\n");
-    GNUNET_SCHEDULER_shutdown ();
-    return;
-  }
-  if (wa->delay)
-  {
-    wa->delayed_until
-      = GNUNET_TIME_relative_to_absolute (wirewatch_idle_sleep_interval);
-    wa_pos = wa_pos->next;
-    if (NULL == wa_pos)
-      wa_pos = wa_head;
-    GNUNET_assert (NULL != wa_pos);
-  }
-  GNUNET_assert (NULL == task);
-  task = GNUNET_SCHEDULER_add_at (wa_pos->delayed_until,
-                                  &find_transfers,
-                                  NULL);
 }
 
 
@@ -510,9 +531,20 @@ history_cb (void *cls,
     {
       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                   "End of list. Committing progress!\n");
-      wa->started_transaction = false;
       do_commit (wa);
     }
+    else
+    {
+      if ( (wa->delay) &&
+           (test_mode) &&
+           (NULL == wa->next) )
+      {
+        GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+                    "Shutdown due to test mode!\n");
+        GNUNET_SCHEDULER_shutdown ();
+        return GNUNET_OK;
+      }
+    }
     return GNUNET_OK; /* will be ignored anyway */
   }
   if (serial_id < wa->latest_row_off)
@@ -542,11 +574,13 @@ history_cb (void *cls,
     wa->delay = false;
     if (wa->started_transaction)
     {
-      wa->started_transaction = false;
       do_commit (wa);
     }
     else
-      GNUNET_break (0); /* how did this happen */
+    {
+      if (mark_shard_done (wa))
+        shard_completed (wa);
+    }
     wa->hh = NULL;
     return GNUNET_SYSERR;
   }
@@ -587,6 +621,7 @@ history_cb (void *cls,
   case GNUNET_DB_STATUS_HARD_ERROR:
     GNUNET_break (0);
     db_plugin->rollback (db_plugin->cls);
+    wa->started_transaction = false;
     GNUNET_SCHEDULER_shutdown ();
     wa->hh = NULL;
     return GNUNET_SYSERR;
@@ -703,7 +738,11 @@ find_transfers (void *cls)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Failed to start request for account history!\n");
-    db_plugin->rollback (db_plugin->cls);
+    if (wa_pos->started_transaction)
+    {
+      db_plugin->rollback (db_plugin->cls);
+      wa_pos->started_transaction = false;
+    }
     global_ret = EXIT_FAILURE;
     GNUNET_SCHEDULER_shutdown ();
     return;