auto-magic replication redirection logic support in the client,

compiles, passes test suite, does magic, has bugs, but none that I know 
at this point. Have not tested everything yet, though. Changed
a lot of code in the client, but normal stuff appears to be working.


BUILD/SETUP.sh:
  make sure client link statically
client/mysqltest.c:
  new commands to test replication probe/parse
include/errmsg.h:
  new error messages
include/mysql.h:
  support for replication auto-magic
libmysql/errmsg.c:
  new error messages
libmysql/libmysql.c:
  replication probe/parse auto-magic
mysql-test/mysql-test-run.sh:
  --client-gdb to run the client in debugger

BUILD/SETUP.sh

@@ -52,7 +52,8 @@ debug_cflags="-DEXTRA_DEBUG -DFORCE_INIT_OF_VARS -DSAFEMALLOC -DSAFE_MUTEX -O2"
 
 base_cxxflags="-felide-constructors -fno-exceptions -fno-rtti"
 
-base_configs="--prefix=/usr/local/mysql --enable-assembler --with-extra-charsets=complex --enable-thread-safe-client --with-mysqld-ldflags=-all-static"
+base_configs="--prefix=/usr/local/mysql --enable-assembler --with-extra-charsets=complex --enable-thread-safe-client --with-mysqld-ldflags=-all-static \
+ --with-client-ldflags=-all-static"
 alpha_configs=""	# Not used yet
 pentium_configs=""
 sparc_configs=""

client/mysqltest.c

@@ -43,7 +43,7 @@
 
 **********************************************************************/
 
-#define MTEST_VERSION "1.8"
+#define MTEST_VERSION "1.9"
 
 #include <global.h>
 #include <my_sys.h>
@@ -159,6 +159,8 @@ Q_SYNC_WITH_MASTER, Q_ERROR,
 Q_SEND,             Q_REAP, 
 Q_DIRTY_CLOSE,      Q_REPLACE,
 Q_PING,             Q_EVAL,
+Q_RPL_PROBE,        Q_ENABLE_RPL_PARSE,
+Q_DISABLE_RPL_PARSE,
 Q_UNKNOWN,                             /* Unknown command.   */
 Q_COMMENT,                             /* Comments, ignored. */
 Q_COMMENT_WITH_COMMAND
@@ -188,6 +190,8 @@ const char *command_names[] = {
   "send",             "reap", 
   "dirty_close",      "replace_result",
   "ping",             "eval",
+  "rpl_probe",        "enable_rpl_parse",
+  "disable_rpl_parse",
   0
 };
 
@@ -642,6 +646,11 @@ int do_sync_with_master(struct st_query* q)
   char query_buf[FN_REFLEN+128];
   int offset = 0;
   char* p = q->first_argument;
+  int rpl_parse;
+
+  rpl_parse = mysql_rpl_parse_enabled(mysql);
+  mysql_disable_rpl_parse(mysql);
+  
   if(*p)
     offset = atoi(p);
   
@@ -658,7 +667,10 @@ int do_sync_with_master(struct st_query* q)
   if(!row[0])
     die("Error on slave while syncing with master");
   mysql_free_result(res);
-      
+
+  if(rpl_parse)
+    mysql_enable_rpl_parse(mysql);
+  
   return 0;
 }
 
@@ -667,6 +679,11 @@ int do_save_master_pos()
   MYSQL_RES* res;
   MYSQL_ROW row;
   MYSQL* mysql = &cur_con->mysql;
+  int rpl_parse;
+
+  rpl_parse = mysql_rpl_parse_enabled(mysql);
+  mysql_disable_rpl_parse(mysql);
+  
   if(mysql_query(mysql, "show master status"))
     die("At line %u: failed in show master status: %d: %s", start_lineno,
 	mysql_errno(mysql), mysql_error(mysql));
@@ -678,6 +695,9 @@ int do_save_master_pos()
   strncpy(master_pos.file, row[0], sizeof(master_pos.file));
   master_pos.pos = strtoul(row[1], (char**) 0, 10); 
   mysql_free_result(res);
+  
+  if(rpl_parse)
+    mysql_enable_rpl_parse(mysql);
       
   return 0;
 }
@@ -702,6 +722,26 @@ int do_let(struct st_query* q)
   return var_set(var_name, var_name_end, var_val_start, p);
 }
 
+int do_rpl_probe(struct st_query* __attribute__((unused)) q)
+{
+  if(mysql_rpl_probe(&cur_con->mysql))
+    die("Failed in mysql_rpl_probe(): %s", mysql_error(&cur_con->mysql));
+  return 0;
+}
+
+int do_enable_rpl_parse(struct st_query* __attribute__((unused)) q)
+{
+  mysql_enable_rpl_parse(&cur_con->mysql);
+  return 0;
+}
+
+int do_disable_rpl_parse(struct st_query* __attribute__((unused)) q)
+{
+  mysql_disable_rpl_parse(&cur_con->mysql);
+  return 0;
+}
+
+
 int do_sleep(struct st_query* q)
 {
   char* p=q->first_argument;
@@ -1825,6 +1865,9 @@ int main(int argc, char** argv)
       case Q_DISCONNECT:
       case Q_DIRTY_CLOSE:	
 	close_connection(q); break;
+      case Q_RPL_PROBE: do_rpl_probe(q); break;
+      case Q_ENABLE_RPL_PARSE: do_enable_rpl_parse(q); break;
+      case Q_DISABLE_RPL_PARSE: do_disable_rpl_parse(q); break;
       case Q_SOURCE: do_source(q); break;
       case Q_SLEEP: do_sleep(q); break;
       case Q_INC: do_inc(q); break;
@@ -1892,7 +1935,7 @@ int main(int argc, char** argv)
       case Q_SAVE_MASTER_POS: do_save_master_pos(); break;	
       case Q_SYNC_WITH_MASTER: do_sync_with_master(q); break;	
       case Q_COMMENT:				/* Ignore row */
-      case Q_COMMENT_WITH_COMMAND:
+      case Q_COMMENT_WITH_COMMAND: 
       case Q_PING:
 	(void) mysql_ping(&cur_con->mysql);
 	break;

include/errmsg.h

@@ -54,3 +54,10 @@ extern const char *client_errors[];	/* Error messages */
 #define CR_CANT_READ_CHARSET	2019
 #define CR_NET_PACKET_TOO_LARGE 2020
 #define CR_EMBEDDED_CONNECTION	2021
+#define CR_PROBE_SLAVE_STATUS   2022
+#define CR_PROBE_SLAVE_HOSTS    2023
+#define CR_PROBE_SLAVE_CONNECT  2024
+#define CR_PROBE_MASTER_CONNECT 2025
+
+
+

include/mysql.h

@@ -154,6 +154,14 @@ enum mysql_option { MYSQL_OPT_CONNECT_TIMEOUT, MYSQL_OPT_COMPRESS,
 enum mysql_status { MYSQL_STATUS_READY,MYSQL_STATUS_GET_RESULT,
 		    MYSQL_STATUS_USE_RESULT};
 
+/* there are three types of queries - the ones that have to go to
+     the master, the ones that go to a slave, and the adminstrative
+     type which must happen on the pivot connectioin
+*/
+enum mysql_rpl_type { MYSQL_RPL_MASTER, MYSQL_RPL_SLAVE,
+			      MYSQL_RPL_ADMIN };
+  
+
 typedef struct st_mysql {
   NET		net;			/* Communication parameters */
   gptr		connector_fd;		/* ConnectorFd for SSL */
@@ -183,7 +191,15 @@ typedef struct st_mysql {
   struct st_mysql* master, *next_slave;
   
   struct st_mysql* last_used_slave; /* needed for round-robin slave pick */
-  my_bool is_slave; /* will be false for a lone connection */
+  struct st_mysql* last_used_con; /* needed for send/read/store/use
+				      result to work
+				      correctly with replication
+				   */
+  my_bool rpl_pivot; /* set if this is the original connection,
+			not a master or a slave we have added though
+			mysql_rpl_probe() or mysql_set_master()/
+			mysql_add_slave()
+		     */
 } MYSQL;
 
 
@@ -261,9 +277,13 @@ int		STDCALL mysql_real_query(MYSQL *mysql, const char *q,
 /* perform query on master */
 int		STDCALL mysql_master_query(MYSQL *mysql, const char *q,
 					unsigned int length);
+int		STDCALL mysql_master_send_query(MYSQL *mysql, const char *q,
+					unsigned int length);
 /* perform query on slave */  
 int		STDCALL mysql_slave_query(MYSQL *mysql, const char *q,
 					unsigned int length);
+int		STDCALL mysql_slave_send_query(MYSQL *mysql, const char *q,
+					unsigned int length);
 
 /* enable/disable parsing of all queries to decide
    if they go on master or slave */
@@ -278,11 +298,22 @@ void            STDCALL mysql_disable_reads_from_master(MYSQL* mysql);
 /* get the value of the master read flag */  
 int             STDCALL mysql_reads_from_master_enabled(MYSQL* mysql);
 
-int             STDCALL mysql_query_goes_to_master(const char* q, int len);  
+enum mysql_rpl_type     STDCALL mysql_rpl_query_type(const char* q, int len);  
 
 /* discover the master and its slaves */  
-int             STDCALL mysql_rpl_probe(MYSQL* mysql);  
-
+int             STDCALL mysql_rpl_probe(MYSQL* mysql);
+  
+/* set the master, close/free the old one, if it is not a pivot */
+int             STDCALL mysql_set_master(MYSQL* mysql, const char* host,
+					   unsigned int port,
+					   const char* user,
+					   const char* passwd);
+int             STDCALL mysql_add_slave(MYSQL* mysql, const char* host,
+					   unsigned int port,
+					   const char* user,
+					   const char* passwd);
+  
+  
 int		STDCALL mysql_create_db(MYSQL *mysql, const char *DB);
 int		STDCALL mysql_drop_db(MYSQL *mysql, const char *DB);
 int		STDCALL mysql_shutdown(MYSQL *mysql);

libmysql/errmsg.c

@@ -16,7 +16,7 @@
    MA 02111-1307, USA */
 
 /* Error messages for MySQL clients */
-/* error messages for the demon is in share/language/errmsg.sys */
+/* error messages for the daemon is in share/language/errmsg.sys */
 
 #include <global.h>
 #include <my_sys.h>
@@ -47,6 +47,10 @@ const char *client_errors[]=
   "Can't initialize character set %-.64s (path: %-.64s)",
   "Got packet bigger than 'max_allowed_packet'",
   "Embedded server",
+  "Error on SHOW SLAVE STATUS: %-.64s",
+  "Error on SHOW SLAVE HOSTS: %-.64s",
+  "Error connecting to slave: %-.64s",
+  "Error connecting to master: %-.64s"
 };
 
 /* Start of code added by Roberto M. Serqueira - martinsc@uol.com.br - 05.24.2001 */
@@ -76,6 +80,10 @@ const char *client_errors[]=
   "No pode inicializar conjunto de caracteres %-.64s (caminho %-.64s)",
   "Obteve pacote maior do que 'max_allowed_packet'",
   "Embedded server"
+  "Error on SHOW SLAVE STATUS: %-.64s",
+  "Error on SHOW SLAVE HOSTS: %-.64s",
+  "Error connecting to slave: %-.64s",
+  "Error connecting to master: %-.64s"
 };
 
 #else /* ENGLISH */
@@ -102,7 +110,11 @@ const char *client_errors[]=
   "Can't set state of named pipe to host: %-.64s  pipe: %-.32s (%lu)",
   "Can't initialize character set %-.64s (path: %-.64s)",
   "Got packet bigger than 'max_allowed_packet'",
-  "Embedded server"
+  "Embedded server",
+  "Error on SHOW SLAVE STATUS:",
+  "Error on SHOW SLAVE HOSTS:",
+  "Error connecting to slave:",
+  "Error connecting to master:"
 };
 #endif
 

mysql-test/mysql-test-run.sh

@@ -124,6 +124,7 @@ USE_RUNNING_SERVER=1
 DO_GCOV=""
 DO_GDB=""
 DO_DDD=""
+DO_CLIENT_GDB=""
 SLEEP_TIME=2
 DBUSER=""
 
@@ -165,13 +166,19 @@ while test $# -gt 0; do
       ;;  
     --gdb )
       if [ x$BINARY_DIST = x1 ] ; then
-	$ECHO "Note: you will get more meaningful output on a source distribution compiled with debugging option when running tests with -gdb option"
+	$ECHO "Note: you will get more meaningful output on a source distribution compiled with debugging option when running tests with --gdb option"
       fi
       DO_GDB=1
       ;;
+    --client-gdb )
+      if [ x$BINARY_DIST = x1 ] ; then
+	$ECHO "Note: you will get more meaningful output on a source distribution compiled with debugging option when running tests with --client-gdb option"
+      fi
+      DO_CLIENT_GDB=1
+      ;;
     --ddd )
       if [ x$BINARY_DIST = x1 ] ; then
-	$ECHO "Note: you will get more meaningful output on a source distribution compiled with debugging option when running tests with -gdb option"
+	$ECHO "Note: you will get more meaningful output on a source distribution compiled with debugging option when running tests with --ddd option"
       fi
       DO_DDD=1
       ;;
@@ -273,7 +280,10 @@ then
 fi
 
 
-MYSQL_TEST="$MYSQL_TEST --no-defaults --socket=$MASTER_MYSOCK --database=$DB --user=$DBUSER --password=$DBPASSWD --silent -v --tmpdir=$MYSQL_TMP_DIR"
+MYSQL_TEST_ARGS="--no-defaults --socket=$MASTER_MYSOCK --database=$DB --user=$DBUSER --password=$DBPASSWD --silent -v --tmpdir=$MYSQL_TMP_DIR"
+MYSQL_TEST_BIN=$MYSQL_TEST
+MYSQL_TEST="$MYSQL_TEST $MYSQL_TEST_ARGS"
+GDB_CLIENT_INIT=$MYSQL_TMP_DIR/gdbinit.client
 GDB_MASTER_INIT=$MYSQL_TMP_DIR/gdbinit.master
 GDB_SLAVE_INIT=$MYSQL_TMP_DIR/gdbinit.slave
 GCOV_MSG=$MYSQL_TMP_DIR/mysqld-gcov.out
@@ -316,6 +326,15 @@ show_failed_diff ()
   fi  
 }
 
+do_gdb_test ()
+{
+  mysql_test_args="$MYSQL_TEST_ARGS $1"
+  $ECHO "set args $mysql_test_args < $2" > $GDB_CLIENT_INIT
+  echo "Set breakpoints ( if needed) and type 'run' in gdb window"
+  #this xterm should not be backgrounded
+  xterm -title "Client" -e gdb -x $GDB_CLIENT_INIT $MYSQL_TEST_BIN
+}
+
 error () {
     $ECHO  "Error:  $1"
     exit 1
@@ -694,8 +713,13 @@ run_testcase ()
   
  if [ -f $tf ] ; then
     $RM -f r/$tname.*reject
-    mytime=`$TIME -p $MYSQL_TEST -R r/$tname.result $EXTRA_MYSQL_TEST_OPT \
-     < $tf 2> $TIMEFILE`
+    mysql_test_args="-R r/$tname.result $EXTRA_MYSQL_TEST_OPT"
+    if [ -z "$DO_CLIENT_GDB" ] ; then
+     mytime=`$TIME -p $MYSQL_TEST  $mysql_test_args < $tf 2> $TIMEFILE`
+    else
+     do_gdb_test "$mysql_test_args" "$tf"
+    fi
+     
     res=$?
 
     if [ $res = 0 ]; then

mysql-test/r/rpl_magic.result

+n
+1
+2
+3
+4
+5
+n
+1
+2
+3
+4
+n
+1
+2
+3
+4
+n
+1
+2
+3
+4
+5

mysql-test/t/rpl_magic.test

+source include/master-slave.inc;
+
+#first, make sure the slave has had enough time to register
+connection master;
+save_master_pos;
+connection slave;
+sync_with_master;
+
+#discover slaves
+connection master;
+rpl_probe;
+
+#turn on master/slave query direction auto-magic
+enable_rpl_parse;
+drop table if exists t1;
+create table t1 ( n int);
+insert into t1 values (1),(2),(3),(4);
+disable_rpl_parse;
+save_master_pos;
+enable_rpl_parse;
+connection slave;
+sync_with_master;
+insert into t1 values(5);
+connection master;
+select * from t1;
+select * from t1;
+disable_rpl_parse;
+select * from t1;
+connection slave;
+select * from t1;