add wirewatch shutdown shard cleanup logic

src/exchange/taler-exchange-wirewatch.c

@@ -226,6 +226,8 @@ shutdown_task (void *cls)
 
     while (NULL != (wa = wa_head))
     {
+      enum GNUNET_DB_QueryStatus qs;
+
       if (NULL != wa->hh)
       {
         TALER_BANK_credit_history_cancel (wa->hh);
@@ -239,7 +241,13 @@ shutdown_task (void *cls)
         db_plugin->rollback (db_plugin->cls);
         wa->started_transaction = false;
       }
-      // FIXME: delete shard lock here (#7124)
+      qs = db_plugin->abort_shard (db_plugin->cls,
+                                   wa_pos->job_name,
+                                   wa_pos->shard_start,
+                                   wa_pos->shard_end);
+      if (qs <= 0)
+        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                    "Failed to abort work shard on shutdown\n");
       GNUNET_free (wa->job_name);
       GNUNET_free (wa);
     }

src/exchangedb/plugin_exchangedb_postgres.c

@@ -3354,6 +3354,15 @@ prepare_statements (struct PostgresClosure *pg)
       " ORDER BY end_row DESC"
       " LIMIT 1;",
       1),
+    /* Used in #postgres_abort_shard() */
+    GNUNET_PQ_make_prepare (
+      "abort_shard",
+      "UPDATE work_shards"
+      "   SET last_attempt=0"
+      " WHERE job_name = $1 "
+      "    AND start_row = $2 "
+      "    AND end_row = $3;",
+      3),
     /* Used in #postgres_begin_shard() */
     GNUNET_PQ_make_prepare (
       "claim_next_shard",
@@ -12586,6 +12595,35 @@ commit:
 }
 
 
+/**
+ * Function called to abort work on a shard.
+ *
+ * @param cls the @e cls of this struct with the plugin-specific state
+ * @param job_name name of the operation to abort a word shard for
+ * @param start_row inclusive start row of the shard
+ * @param end_row exclusive end row of the shard
+ * @return transaction status code
+ */
+static enum GNUNET_DB_QueryStatus
+postgres_abort_shard (void *cls,
+                      const char *job_name,
+                      uint64_t start_row,
+                      uint64_t end_row)
+{
+  struct PostgresClosure *pg = cls;
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_string (job_name),
+    GNUNET_PQ_query_param_uint64 (&start_row),
+    GNUNET_PQ_query_param_uint64 (&end_row),
+    GNUNET_PQ_query_param_end
+  };
+
+  return GNUNET_PQ_eval_prepared_non_select (pg->conn,
+                                             "abort_shard",
+                                             params);
+}
+
+
 /**
  * Function called to persist that work on a shard was completed.
  *
@@ -13889,6 +13927,8 @@ libtaler_plugin_exchangedb_postgres_init (void *cls)
     = &postgres_insert_records_by_table;
   plugin->begin_shard
     = &postgres_begin_shard;
+  plugin->abort_shard
+    = &postgres_abort_shard;
   plugin->complete_shard
     = &postgres_complete_shard;
   plugin->begin_revolving_shard

src/include/taler_exchangedb_plugin.h

@@ -4296,6 +4296,20 @@ struct TALER_EXCHANGEDB_Plugin
                  uint64_t *start_row,
                  uint64_t *end_row);
 
+  /**
+   * Function called to abort work on a shard.
+   *
+   * @param cls the @e cls of this struct with the plugin-specific state
+   * @param job_name name of the operation to abort a word shard for
+   * @param start_row inclusive start row of the shard
+   * @param end_row exclusive end row of the shard
+   * @return transaction status code
+   */
+  enum GNUNET_DB_QueryStatus
+  (*abort_shard)(void *cls,
+                 const char *job_name,
+                 uint64_t start_row,
+                 uint64_t end_row);
 
   /**
    * Function called to persist that work on a shard was completed.