[taler-exchange] branch master updated: fix idle transaction issue introduced earlier

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grothoff pushed a commit to branch master
in repository exchange.

The following commit(s) were added to refs/heads/master by this push:
     new 889625a9 fix idle transaction issue introduced earlier
889625a9 is described below

commit 889625a90f97a23048b3c9dad418f86acb81314b
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Thu Dec 9 22:15:30 2021 +0100

    fix idle transaction issue introduced earlier
---
 src/exchange/taler-exchange-wirewatch.c | 167 ++++++++++++++++++++------------
 1 file changed, 103 insertions(+), 64 deletions(-)

diff --git a/src/exchange/taler-exchange-wirewatch.c 
b/src/exchange/taler-exchange-wirewatch.c
index a417342a..eb044994 100644
--- a/src/exchange/taler-exchange-wirewatch.c
+++ b/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;
@@ -377,61 +378,13 @@ handle_soft_error (struct WireAccount *wa)
 
 
 /**
- * We are finished with the current transaction, try
- * to commit and then schedule the next iteration.
+ * We are done with a shard, move on to the next one.
  *
- * @param wa wire account to commit for
+ * @param wa wire account for which we completed a shard
  */
 static void
-do_commit (struct WireAccount *wa)
+shard_completed (struct WireAccount *wa)
 {
-  enum GNUNET_DB_QueryStatus qs;
-
-  if (wa->shard_end <= wa->latest_row_off)
-  {
-    /* 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)
-  {
-  case GNUNET_DB_STATUS_HARD_ERROR:
-    GNUNET_break (0);
-    GNUNET_SCHEDULER_shutdown ();
-    return;
-  case GNUNET_DB_STATUS_SOFT_ERROR:
-    /* reduce transaction size to reduce rollback probability */
-    handle_soft_error (wa);
-    return;
-  case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
-  case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
-    /* normal case */
-    break;
-  }
   /* transaction success, update #last_row_off */
   wa->batch_start = wa->latest_row_off;
   if (wa->batch_size < MAXIMUM_BATCH_SIZE)
@@ -447,15 +400,6 @@ do_commit (struct WireAccount *wa)
                 "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
@@ -472,6 +416,83 @@ do_commit (struct WireAccount *wa)
 }
 
 
+/**
+ * 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.
+ *
+ * @param wa wire account to commit for
+ */
+static void
+do_commit (struct WireAccount *wa)
+{
+  enum GNUNET_DB_QueryStatus qs;
+
+  wa->started_transaction = false;
+  mark_shard_done (wa);
+  qs = db_plugin->commit (db_plugin->cls);
+  switch (qs)
+  {
+  case GNUNET_DB_STATUS_HARD_ERROR:
+    GNUNET_break (0);
+    GNUNET_SCHEDULER_shutdown ();
+    return;
+  case GNUNET_DB_STATUS_SOFT_ERROR:
+    /* reduce transaction size to reduce rollback probability */
+    handle_soft_error (wa);
+    return;
+  case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
+  case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
+    /* normal case */
+    break;
+  }
+  shard_completed (wa);
+}
+
+
 /**
  * Callbacks of this type are used to serve the result of asking
  * the bank for the transaction history.
@@ -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;

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