1 files changed, 233 insertions, 0 deletions
diff --git a/sql/wsrep_applier.cc b/sql/wsrep_applier.cc
new file mode 100644
index 00000000..90ede81a
--- /dev/null
+++ b/sql/wsrep_applier.cc
@@ -0,0 +1,233 @@
+/* Copyright (C) 2013-2019 Codership Oy <info@codership.com>
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this program; if not, write to the Free Software Foundation, Inc.,
+   51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA. */
+
+#include "mariadb.h"
+#include "mysql/service_wsrep.h"
+#include "wsrep_applier.h"
+
+#include "wsrep_priv.h"
+#include "wsrep_binlog.h" // wsrep_dump_rbr_buf()
+#include "wsrep_xid.h"
+#include "wsrep_thd.h"
+#include "wsrep_trans_observer.h"
+
+#include "slave.h" // opt_log_slave_updates
+#include "debug_sync.h"
+
+/*
+  read the first event from (*buf). The size of the (*buf) is (*buf_len).
+  At the end (*buf) is shitfed to point to the following event or NULL and
+  (*buf_len) will be changed to account just being read bytes of the 1st event.
+*/
+static Log_event* wsrep_read_log_event(
+    char **arg_buf, size_t *arg_buf_len,
+    const Format_description_log_event *description_event)
+{
+  DBUG_ENTER("wsrep_read_log_event");
+  char *head= (*arg_buf);
+
+  uint data_len= uint4korr(head + EVENT_LEN_OFFSET);
+  uchar *buf= (uchar*) (*arg_buf);
+  const char *error= 0;
+  Log_event *res=  0;
+
+  res= Log_event::read_log_event(buf, data_len, &error, description_event,
+                                 true);
+
+  if (!res)
+  {
+    DBUG_ASSERT(error != 0);
+    sql_print_error("Error in Log_event::read_log_event(): "
+                    "'%s', data_len: %d, event_type: %d",
+                    error,data_len,head[EVENT_TYPE_OFFSET]);
+  }
+  (*arg_buf)+= data_len;
+  (*arg_buf_len)-= data_len;
+  DBUG_RETURN(res);
+}
+
+#include "transaction.h" // trans_commit(), trans_rollback()
+
+void wsrep_set_apply_format(THD* thd, Format_description_log_event* ev)
+{
+  if (thd->wsrep_apply_format)
+  {
+    delete (Format_description_log_event*)thd->wsrep_apply_format;
+  }
+  thd->wsrep_apply_format= ev;
+}
+
+Format_description_log_event*
+wsrep_get_apply_format(THD* thd)
+{
+  if (thd->wsrep_apply_format)
+  {
+    return (Format_description_log_event*) thd->wsrep_apply_format;
+  }
+
+  DBUG_ASSERT(thd->wsrep_rgi);
+
+  return thd->wsrep_rgi->rli->relay_log.description_event_for_exec;
+}
+
+void wsrep_store_error(const THD* const thd, wsrep::mutable_buffer& dst)
+{
+  Diagnostics_area::Sql_condition_iterator it=
+    thd->get_stmt_da()->sql_conditions();
+  const Sql_condition* cond;
+
+  static size_t const max_len= 2*MAX_SLAVE_ERRMSG; // 2x so that we have enough
+
+  dst.resize(max_len);
+
+  char* slider= dst.data();
+  const char* const buf_end= slider + max_len - 1; // -1: leave space for \0
+
+  for (cond= it++; cond && slider < buf_end; cond= it++)
+  {
+    uint const err_code= cond->get_sql_errno();
+    const char* const err_str= cond->get_message_text();
+
+    slider+= my_snprintf(slider, buf_end - slider, " %s, Error_code: %d;",
+                         err_str, err_code);
+  }
+
+  if (slider != dst.data())
+  {
+    *slider= '\0';
+    slider++;
+  }
+
+  dst.resize(slider - dst.data());
+
+  WSREP_DEBUG("Error buffer for thd %llu seqno %lld, %zu bytes: '%s'",
+              thd->thread_id, (long long)wsrep_thd_trx_seqno(thd),
+              dst.size(), dst.size() ? dst.data() : "(null)");
+}
+
+int wsrep_apply_events(THD*        thd,
+                       Relay_log_info* rli,
+                       const void* events_buf,
+                       size_t      buf_len)
+{
+  char *buf= (char *)events_buf;
+  int rcode= 0;
+  int event= 1;
+  Log_event_type typ;
+
+  DBUG_ENTER("wsrep_apply_events");
+  if (!buf_len) WSREP_DEBUG("empty rbr buffer to apply: %lld",
+                            (long long) wsrep_thd_trx_seqno(thd));
+
+  thd->variables.gtid_seq_no= 0;
+  if (wsrep_gtid_mode)
+    thd->variables.gtid_domain_id= wsrep_gtid_server.domain_id;
+  else
+    thd->variables.gtid_domain_id= global_system_variables.gtid_domain_id;
+
+  while (buf_len)
+  {
+    int exec_res;
+    Log_event* ev= wsrep_read_log_event(&buf, &buf_len,
+                                          wsrep_get_apply_format(thd));
+    if (!ev)
+    {
+      WSREP_ERROR("applier could not read binlog event, seqno: %lld, len: %zu",
+                  (long long)wsrep_thd_trx_seqno(thd), buf_len);
+      rcode= WSREP_ERR_BAD_EVENT;
+      goto error;
+    }
+
+    typ= ev->get_type_code();
+
+    switch (typ) {
+    case FORMAT_DESCRIPTION_EVENT:
+      wsrep_set_apply_format(thd, (Format_description_log_event*)ev);
+      continue;
+    case GTID_EVENT:
+      {
+        Gtid_log_event *gtid_ev= (Gtid_log_event*)ev;
+        thd->variables.server_id= gtid_ev->server_id;
+        thd->variables.gtid_domain_id= gtid_ev->domain_id;
+        if ((gtid_ev->server_id == wsrep_gtid_server.server_id) &&
+            (gtid_ev->domain_id == wsrep_gtid_server.domain_id))
+        {
+          thd->variables.wsrep_gtid_seq_no= gtid_ev->seq_no;
+        }
+        else
+        {
+          thd->variables.gtid_seq_no= gtid_ev->seq_no;
+        }
+        delete ev;
+      }
+      continue;
+    default:
+      break;
+    }
+
+
+    if (!thd->variables.gtid_seq_no && wsrep_thd_is_toi(thd) && 
+        (ev->get_type_code() == QUERY_EVENT))
+    { 
+      uint64 seqno= wsrep_gtid_server.seqno_inc();
+      thd->wsrep_current_gtid_seqno= seqno;
+      if (mysql_bin_log.is_open() && wsrep_gtid_mode)
+      { 
+        thd->variables.gtid_seq_no= seqno;
+      }
+    }
+    /* Use the original server id for logging. */
+    thd->set_server_id(ev->server_id);
+    thd->set_time();                            // time the query
+    thd->transaction->start_time.reset(thd);
+    thd->lex->current_select= 0;
+    if (!ev->when)
+    {
+      my_hrtime_t hrtime= my_hrtime();
+      ev->when= hrtime_to_my_time(hrtime);
+      ev->when_sec_part= hrtime_sec_part(hrtime);
+    }
+
+    thd->variables.option_bits=
+      (thd->variables.option_bits & ~OPTION_SKIP_REPLICATION) |
+      (ev->flags & LOG_EVENT_SKIP_REPLICATION_F ?  OPTION_SKIP_REPLICATION : 0);
+
+    ev->thd= thd;
+    exec_res= ev->apply_event(thd->wsrep_rgi);
+    DBUG_PRINT("info", ("exec_event result: %d", exec_res));
+
+    if (exec_res)
+    {
+      WSREP_WARN("Event %d %s apply failed: %d, seqno %lld",
+                 event, ev->get_type_str(), exec_res,
+                 (long long) wsrep_thd_trx_seqno(thd));
+      rcode= exec_res;
+      /* stop processing for the first error */
+      delete ev;
+      goto error;
+    }
+    event++;
+
+    delete_or_keep_event_post_apply(thd->wsrep_rgi, typ, ev);
+  }
+
+error:
+  if (thd->killed == KILL_CONNECTION)
+    WSREP_INFO("applier aborted: %lld", (long long)wsrep_thd_trx_seqno(thd));
+
+  wsrep_set_apply_format(thd, NULL);
+
+  DBUG_RETURN(rcode);
+}