MDEV-27037 mysqlbinlog emits a warning when reaching EOF before stop-datetime

Emit a warning in the event that we finished processing input files
before reaching the boundary indicated by --stop-datetime.

client/mysqlbinlog.cc

@@ -2847,6 +2847,7 @@ static Exit_status dump_local_log_entries(PRINT_EVENT_INFO *print_event_info,
   IO_CACHE cache,*file= &cache;
   uchar tmp_buff[BIN_LOG_HEADER_SIZE];
   Exit_status retval= OK_CONTINUE;
+  my_time_t last_ev_when= MY_TIME_T_MAX;
 
   if (logname && strcmp(logname, "-") != 0)
   {
@@ -2952,8 +2953,21 @@ static Exit_status dump_local_log_entries(PRINT_EVENT_INFO *print_event_info,
                   "end of input", stop_position);
       }
 
+      /*
+        Emit a warning in the event that we finished processing input
+        before reaching the boundary indicated by --stop-datetime.
+      */
+      if (stop_datetime != MY_TIME_T_MAX &&
+          stop_datetime > last_ev_when)
+      {
+          retval = OK_STOP;
+          warning("Did not reach stop datetime '%s' "
+                  "before end of input", stop_datetime_str);
+      }
+
       goto end;
     }
+    last_ev_when= ev->when;
     if ((retval= process_event(print_event_info, ev, old_off, logname)) !=
         OK_CONTINUE)
       goto end;

mysql-test/suite/binlog/r/binlog_mysqlbinlog_warn_stop_datetime.result

+
+# MDEV-27037 mysqlbinlog emits a warning when reaching EOF before stop-datetime
+
+set timestamp=1000000000;
+CREATE TABLE t1(word VARCHAR(20));
+set timestamp=1000000010;
+INSERT INTO t1 VALUES ("abirvalg");
+set timestamp=1000000020;
+INSERT INTO t1 SELECT * FROM t1;
+flush logs;
+Case: Default, must not see warning.
+# MYSQL_BINLOG --short-form MYSQLD_DATADIR/master-bin.000001 --result-file=ignored_output_file
+Case: Stop datetime before EOF, must not see warning.
+# MYSQL_BINLOG --short-form --stop-datetime='2001-09-08 21:46:50' MYSQLD_DATADIR/master-bin.000001 --result-file=ignored_output_file
+Case: Stop datetime between records, must not see warning.
+# MYSQL_BINLOG --short-form --stop-datetime='2001-09-08 21:46:55' MYSQLD_DATADIR/master-bin.000001 --result-file=ignored_output_file
+Case: Stop datetime at EOF, must not see warning.
+# MYSQL_BINLOG --short-form --stop-datetime='2001-09-08 21:46:55' MYSQLD_DATADIR/master-bin.000001 --result-file=ignored_output_file
+Case: Stop datetime after EOF, must see warning.
+# MYSQL_BINLOG --short-form --stop-datetime='2035-01-19 03:14:05' MYSQLD_DATADIR/master-bin.000001 --result-file=ignored_output_file
+WARNING: Did not reach stop datetime '2035-01-19 03:14:05' before end of input
+DROP TABLE t1;
+# End of binlog_mysqlbinlog_warn_stop_datetime.test

mysql-test/suite/binlog/t/binlog_mysqlbinlog_warn_stop_datetime.test

+--echo
+--echo # MDEV-27037 mysqlbinlog emits a warning when reaching EOF before stop-datetime
+--echo
+
+--source include/have_binlog_format_statement.inc
+
+--let ignored_output_file= $MYSQLTEST_VARDIR/tmp/warn_pos_test_file.out
+
+set timestamp=1000000000;
+CREATE TABLE t1(word VARCHAR(20));
+set timestamp=1000000010;
+INSERT INTO t1 VALUES ("abirvalg");
+set timestamp=1000000020;
+INSERT INTO t1 SELECT * FROM t1;
+--let MYSQLD_DATADIR= `select @@datadir;`
+flush logs;
+
+--echo Case: Default, must not see warning.
+--echo # MYSQL_BINLOG --short-form MYSQLD_DATADIR/master-bin.000001 --result-file=ignored_output_file
+--exec $MYSQL_BINLOG --short-form $MYSQLD_DATADIR/master-bin.000001 --result-file=$ignored_output_file 2>&1
+
+--echo Case: Stop datetime before EOF, must not see warning.
+--echo # MYSQL_BINLOG --short-form --stop-datetime='2001-09-08 21:46:50' MYSQLD_DATADIR/master-bin.000001 --result-file=ignored_output_file
+--exec $MYSQL_BINLOG --short-form --stop-datetime='2001-09-08 21:46:50' $MYSQLD_DATADIR/master-bin.000001 --result-file=$ignored_output_file 2>&1
+
+--echo Case: Stop datetime between records, must not see warning.
+--echo # MYSQL_BINLOG --short-form --stop-datetime='2001-09-08 21:46:55' MYSQLD_DATADIR/master-bin.000001 --result-file=ignored_output_file
+--exec $MYSQL_BINLOG --short-form --stop-datetime='2001-09-08 21:46:55' $MYSQLD_DATADIR/master-bin.000001 --result-file=$ignored_output_file 2>&1
+
+--echo Case: Stop datetime at EOF, must not see warning.
+--echo # MYSQL_BINLOG --short-form --stop-datetime='2001-09-08 21:46:55' MYSQLD_DATADIR/master-bin.000001 --result-file=ignored_output_file
+--exec $MYSQL_BINLOG --short-form --stop-datetime='2001-09-08 21:46:55' $MYSQLD_DATADIR/master-bin.000001 --result-file=$ignored_output_file 2>&1
+
+--echo Case: Stop datetime after EOF, must see warning.
+--echo # MYSQL_BINLOG --short-form --stop-datetime='2035-01-19 03:14:05' MYSQLD_DATADIR/master-bin.000001 --result-file=ignored_output_file
+--exec $MYSQL_BINLOG --short-form --stop-datetime='2035-01-19 03:14:05' $MYSQLD_DATADIR/master-bin.000001 --result-file=$ignored_output_file 2>&1
+
+DROP TABLE t1;
+
+--remove_file $ignored_output_file
+
+--echo # End of binlog_mysqlbinlog_warn_stop_datetime.test