MDEV-34705: Binlog-in-engine: Implement SHOW BINARY LOGS

Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

mysql-test/suite/binlog_in_engine/binlog_in_engine_restart.test

@@ -40,6 +40,8 @@ while ($i < 10) {
   inc $i;
 }
 
+SHOW BINARY LOGS;
+
 --exec $MYSQL_BINLOG --start-position=$gtid_pos3 --read-from-remote-server --user=root --host=127.0.0.1 --port=$MASTER_MYPORT master-bin.000001 > $MYSQLTEST_VARDIR/tmp/mysqlbinlog3.txt
 
 DROP TABLE t1;

sql/handler.h

@@ -1230,6 +1230,17 @@ typedef struct st_ha_create_table_option {
   struct st_mysql_sys_var *var;
 } ha_create_table_option;
 
+
+/* Struct used to return binlog file list for SHOW BINARY LOGS from engine. */
+struct binlog_file_entry
+{
+  binlog_file_entry *next;
+  LEX_CSTRING name;
+  /* The size is filled in by server, engine need not return it. */
+  my_off_t size;
+};
+
+
 class handler;
 class group_by_handler;
 class derived_handler;
@@ -1552,6 +1563,8 @@ struct handlerton
   void (*binlog_oob_free)(THD *thd, void *engine_data);
   /* Obtain an object to allow reading from the binlog. */
   handler_binlog_reader * (*get_binlog_reader)();
+  /* Obtain list of binlog files (SHOw BINARY LOGS). */
+  binlog_file_entry * (*get_binlog_file_list)(MEM_ROOT *mem_root);
 
    /*
      Optional clauses in the CREATE/ALTER TABLE

sql/sql_repl.cc

@@ -990,13 +990,6 @@ static int send_heartbeat_event(binlog_send_info *info,
 }
 
 
-struct binlog_file_entry
-{
-  binlog_file_entry *next;
-  LEX_CSTRING name;
-  my_off_t size;
-};
-
 /**
    Read all binary logs and return as a list
 
@@ -1021,6 +1014,13 @@ get_binlog_list(MEM_ROOT *memroot, bool reverse= true,
   binlog_file_entry *current_list= NULL, *current_link= NULL, *e;
   DBUG_ENTER("get_binlog_list");
 
+  if (opt_binlog_engine_hton)
+  {
+    if (already_locked)
+      mysql_bin_log.unlock_index();
+    DBUG_RETURN((*opt_binlog_engine_hton->get_binlog_file_list)(memroot));
+  }
+
   if (!mysql_bin_log.is_open())
   {
     if (already_locked)

storage/innobase/handler/ha_innodb.cc

@@ -4024,6 +4024,34 @@ static void innobase_update_optimizer_costs(OPTIMIZER_COSTS *costs)
 }
 
 
+static binlog_file_entry *innodb_get_binlog_file_list(MEM_ROOT *mem_root)
+{
+  uint64_t first, last;
+  if (innodb_find_binlogs(&first, &last))
+    return nullptr;
+  binlog_file_entry *list;
+  binlog_file_entry **next_ptr= &list;
+  for (uint64_t i= first; i <= last; ++i)
+  {
+    binlog_file_entry *e= (binlog_file_entry *)alloc_root(mem_root, sizeof(*e));
+    if (!e)
+      return nullptr;
+    char name_buf[OS_FILE_MAX_PATH];
+    binlog_name_make(name_buf, i);
+    e->name.length= strlen(name_buf);
+    char *str= (char *)alloc_root(mem_root, e->name.length + 1);
+    if (!str)
+      return nullptr;
+    strcpy(str, name_buf);
+    e->name.str= str;
+    *next_ptr= e;
+    next_ptr= &(e->next);
+  }
+  *next_ptr= nullptr;
+  return list;
+}
+
+
 /** Initialize the InnoDB storage engine plugin.
 @param[in,out]	p	InnoDB handlerton
 @return error code
@@ -4097,6 +4125,7 @@ static int innodb_init(void* p)
         innobase_hton->binlog_oob_data= innodb_binlog_oob;
         innobase_hton->binlog_oob_free= innodb_free_oob;
         innobase_hton->get_binlog_reader= innodb_get_binlog_reader;
+        innobase_hton->get_binlog_file_list= innodb_get_binlog_file_list;
 
 	innodb_remember_check_sysvar_funcs();
 

storage/innobase/handler/innodb_binlog.cc

@@ -2131,3 +2131,47 @@ innobase_binlog_write_direct(IO_CACHE *cache,
   /* ToDo: Presumably innodb_binlog_write_cache() should be able to fail in some cases? Then return any such error to the caller. */
   return false;
 }
+
+
+bool
+innodb_find_binlogs(uint64_t *out_first, uint64_t *out_last)
+{
+  MY_DIR *dir= my_dir(innodb_binlog_directory, MYF(0));
+  if (!dir)
+  {
+    ib::error() << "Could not read the binlog directory '" <<
+      innodb_binlog_directory << "', error code " << my_errno << ".";
+    return true;
+  }
+
+  size_t num_entries= dir->number_of_files;
+  fileinfo *entries= dir->dir_entry;
+  uint64_t first_file_no, last_file_no;
+  uint64_t num_file_no= 0;
+  for (size_t i= 0; i < num_entries; ++i) {
+    const char *name= entries[i].name;
+    uint64_t file_no;
+    if (!is_binlog_name(name, &file_no))
+      continue;
+    if (num_file_no == 0 || file_no < first_file_no)
+      first_file_no= file_no;
+    if (num_file_no == 0 || file_no > last_file_no)
+      last_file_no= file_no;
+    ++num_file_no;
+  }
+  my_dirend(dir);
+
+  if (num_file_no == 0)
+  {
+    ib::error() << "No binlog files found (deleted externally?)";
+    return true;
+  }
+  if (num_file_no != last_file_no - first_file_no + 1)
+  {
+    ib::error() << "Missing binlog files (deleted externally?)";
+    return true;
+  }
+  *out_first= first_file_no;
+  *out_last= last_file_no;
+  return false;
+}

storage/innobase/include/innodb_binlog.h

@@ -97,5 +97,6 @@ extern void innodb_binlog_trx(trx_t *trx, mtr_t *mtr);
 extern bool innobase_binlog_write_direct
   (IO_CACHE *cache, handler_binlog_event_group_info *binlog_info,
    const rpl_gtid *gtid);
+extern bool innodb_find_binlogs(uint64_t *out_first, uint64_t *out_last);
 
 #endif /* innodb_binlog_h */