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WL# 2094 Federated Storage Handler 

This changeset/patch is on top of changesets 1.1814 and 1.1846 
(for bugs 8033 and 8065) and now fixes bug 8535.

These changes have been built and tested successfully on build.mysql.com

handler.cc:
  Added hooks for federated_db_init() and federated_db_end(), 
  as done with ha_archive_db does, per suggestion by Ingo in
  code review of patch 1.1846.
ha_federated.h:
  declaration of federated_db_init() and federated_db_end()
ha_federated.cc:
  - Fixed some indentation problems from indent-ex (mainly to do with
    cases where "variablename += value"
  - Added federated_db_init() and federated_db_end(), as done with
    archive, which also handler more elegantly one of the memory leaks
    from bug 8033 where the federated_mutex was not freed
  - Removed extrenous debug messages in parse_url()
  - Fixed bug 8535, caused by NULL being quoted in write_row. This used to
    work (incorrectly) but a recent change was made in the server that 
    exposed this


sql/ha_federated.cc:
   - Fixed some indentation problems from indent-ex (mainly to do with
      cases where "variablename += value"
    - Added federated_db_init() and federated_db_end(), as done with
      archive, which also handler more elegantly one of the memory leaks
      from bug 8033 where the federated_mutex was not freed
    - Removed extrenous debug messages in parse_url()
sql/ha_federated.h:
  declaration of federated_db_init() and federated_db_end()
sql/handler.cc:
  Added hooks for federated_db_init() and federated_db_end(), as done with ha_archive_db does.
parent 300dde3d
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Showing with 125 additions and 101 deletions
sql/ha_federated.cc
View file @ bc430174
......@@ -369,7 +369,50 @@ static byte *federated_get_key(FEDERATED_SHARE *share, uint *length,
my_bool not_used __attribute__ ((unused)))
{
*length= share->table_name_length;
return (byte *) share->table_name;
return (byte*)share->table_name;
}
/*
Initialize the federated handler.
SYNOPSIS
federated_db_init()
void
RETURN
FALSE OK
TRUE Error
*/
bool federated_db_init()
{
federated_init= 1;
VOID(pthread_mutex_init(&federated_mutex, MY_MUTEX_INIT_FAST));
return (hash_init(&federated_open_tables, system_charset_info, 32, 0, 0,
(hash_get_key) federated_get_key, 0, 0));
}
/*
Release the federated handler.
SYNOPSIS
federated_db_end()
void
RETURN
FALSE OK
*/
bool federated_db_end()
{
if (federated_init)
{
hash_free(&federated_open_tables);
VOID(pthread_mutex_destroy(&federated_mutex));
}
federated_init= 0;
return FALSE;
}
/*
......@@ -425,14 +468,11 @@ static int parse_url(FEDERATED_SHARE *share, TABLE *table,
share->scheme[share->username - share->scheme]= '\0';
if (strcmp(share->scheme, "mysql") != 0)
{
DBUG_PRINT("ha_federated::parse_url",
("The federated handler currently only supports connecting\
to a MySQL database!!!\n"));
my_error(error_num, MYF(0),
"ERROR: federated handler only supports remote 'mysql://' database");
DBUG_RETURN(1);
}
share->username += 3;
share->username+= 3;
if ((share->hostname= strchr(share->username, '@')))
{
......@@ -447,8 +487,6 @@ static int parse_url(FEDERATED_SHARE *share, TABLE *table,
// make sure there isn't an extra / or @
if ((strchr(share->password, '/') || strchr(share->hostname, '@')))
{
DBUG_PRINT("ha_federated::parse_url",
("this connection string is not in the correct format!!!\n"));
my_error(error_num, MYF(0),
"this connection string is not in the correct format!!!\n");
DBUG_RETURN(1);
......@@ -467,8 +505,6 @@ static int parse_url(FEDERATED_SHARE *share, TABLE *table,
// make sure there isn't an extra / or @
if ((strchr(share->username, '/')) || (strchr(share->hostname, '@')))
{
DBUG_PRINT("ha_federated::parse_url",
("this connection string is not in the correct format!!!\n"));
my_error(error_num, MYF(0),
"this connection string is not in the correct format!!!\n");
DBUG_RETURN(1);
......@@ -496,8 +532,6 @@ static int parse_url(FEDERATED_SHARE *share, TABLE *table,
}
else
{
DBUG_PRINT("ha_federated::parse_url",
("this connection string is not in the correct format!!!\n"));
my_error(error_num, MYF(0),
"this connection string is not in the correct format!!!\n");
DBUG_RETURN(1);
......@@ -505,8 +539,6 @@ static int parse_url(FEDERATED_SHARE *share, TABLE *table,
}
else
{
DBUG_PRINT("ha_federated::parse_url",
("this connection string is not in the correct format!!!\n"));
my_error(error_num, MYF(0),
"this connection string is not in the correct format!!!\n");
DBUG_RETURN(1);
......@@ -514,8 +546,6 @@ static int parse_url(FEDERATED_SHARE *share, TABLE *table,
// make sure there's not an extra /
if ((strchr(share->table_base_name, '/')))
{
DBUG_PRINT("ha_federated::parse_url",
("this connection string is not in the correct format!!!\n"));
my_error(error_num, MYF(0),
"this connection string is not in the correct format!!!\n");
DBUG_RETURN(1);
......@@ -533,12 +563,13 @@ static int parse_url(FEDERATED_SHARE *share, TABLE *table,
DBUG_PRINT("ha_federated::parse_url",
("scheme %s username %s password %s \
hostname %s port %d database %s tablename %s\n", share->scheme, share->username, share->password, share->hostname, share->port, share->database, share->table_base_name));
hostname %s port %d database %s tablename %s\n",
share->scheme, share->username, share->password,
share->hostname, share->port, share->database,
share->table_base_name));
}
else
{
DBUG_PRINT("ha_federated::parse_url",
("this connection string is not in the correct format!!!\n"));
my_error(error_num, MYF(0),
"this connection string is not in the correct format!!!\n");
DBUG_RETURN(1);
......@@ -546,8 +577,6 @@ static int parse_url(FEDERATED_SHARE *share, TABLE *table,
}
else
{
DBUG_PRINT("ha_federated::parse_url",
("this connection string is not in the correct format!!!\n"));
my_error(error_num, MYF(0),
"this connection string is not in the correct format!!!\n");
DBUG_RETURN(1);
......@@ -573,35 +602,27 @@ static int parse_url(FEDERATED_SHARE *share, TABLE *table,
RETURN VALUE
0 After fields have had field values stored from record
*/
uint ha_federated::convert_row_to_internal_format(byte *record, MYSQL_ROW row)
uint ha_federated::convert_row_to_internal_format(byte* record, MYSQL_ROW row)
{
unsigned long *lengths;
unsigned int num_fields;
unsigned int x= 0;
ulong *lengths;
uint num_fields;
uint x= 0;
DBUG_ENTER("ha_federated::convert_row_to_internal_format");
num_fields= mysql_num_fields(result);
lengths= (unsigned long*) my_malloc(num_fields * sizeof(unsigned long),
lengths= (ulong*) my_malloc(num_fields * sizeof(ulong),
MYF(0));
cli_fetch_lengths((unsigned long*) (lengths), row, num_fields);
cli_fetch_lengths((ulong*) (lengths), row, num_fields);
memset(record, 0, table->s->null_bytes);
for (Field ** field= table->field; *field; field++, x++)
for (Field **field= table->field; *field; field++, x++)
{
if (!row[x])
{
(*field)->set_null();
}
else
/*
changed system_charset_info to default_charset_info because
testing revealed that german text was not being retrieved properly
*/
DBUG_PRINT("ha_federated::convert_row_to_internal_format",
("row[%d] %s length %lu", x, row[x], lengths[x]));
(*field)->store(row[x], lengths[x], &my_charset_bin);
(*field)->store(row[x], lengths[x], &my_charset_bin);
}
my_free((gptr) lengths, MYF(0));
lengths= 0;
......@@ -637,11 +658,12 @@ bool ha_federated::create_where_from_key(String *to, KEY *key_info,
if (*key++)
{
if (to->append("IS NULL", 7))
DBUG_PRINT("ha_federated::create_where_from_key",
("NULL type %s", to->c_ptr_quick()));
DBUG_RETURN(1);
key_length -= key_part->store_length;
key += key_part->store_length - 1;
DBUG_RETURN(1);
DBUG_PRINT("ha_federated::create_where_from_key",
("NULL type %s", to->c_ptr_quick()));
key_length-= key_part->store_length;
key+= key_part->store_length - 1;
continue;
}
key_length--;
......@@ -655,29 +677,29 @@ bool ha_federated::create_where_from_key(String *to, KEY *key_info,
/* This is can be threated as a hex string */
Field_bit *field= (Field_bit *) (key_part->field);
char buff[64 + 2], *ptr;
byte *end= (byte *) (key) + length;
byte *end= (byte*)(key)+length;
buff[0]= '0';
buff[1]= 'x';
for (ptr= buff + 2; key < end; key++)
{
uint tmp= (uint) (uchar) * key;
uint tmp= (uint)(uchar) *key;
*ptr++= _dig_vec_upper[tmp >> 4];
*ptr++= _dig_vec_upper[tmp & 15];
}
if (to->append(buff, (uint) (ptr - buff)))
if (to->append(buff, (uint)(ptr - buff)))
DBUG_RETURN(1);
DBUG_PRINT("ha_federated::create_where_from_key",
("bit type %s", to->c_ptr_quick()));
key_length -= length;
key_length-= length;
continue;
}
if (key_part->key_part_flag & HA_BLOB_PART)
{
uint blob_length= uint2korr(key);
key += HA_KEY_BLOB_LENGTH;
key_length -= HA_KEY_BLOB_LENGTH;
key+= HA_KEY_BLOB_LENGTH;
key_length-= HA_KEY_BLOB_LENGTH;
tmp.set_quick((char*) key, blob_length, &my_charset_bin);
if (append_escaped(to, &tmp))
......@@ -690,7 +712,7 @@ bool ha_federated::create_where_from_key(String *to, KEY *key_info,
else if (key_part->key_part_flag & HA_VAR_LENGTH_PART)
{
length= uint2korr(key);
key += HA_KEY_BLOB_LENGTH;
key+= HA_KEY_BLOB_LENGTH;
tmp.set_quick((char*) key, length, &my_charset_bin);
if (append_escaped(to, &tmp))
DBUG_RETURN(1);
......@@ -722,8 +744,8 @@ bool ha_federated::create_where_from_key(String *to, KEY *key_info,
DBUG_RETURN(1);
DBUG_PRINT("ha_federated::create_where_from_key",
("final value for 'to' %s", to->c_ptr_quick()));
key += length;
key_length -= length;
key+= length;
key_length-= length;
DBUG_RETURN(0);
}
DBUG_RETURN(1);
......@@ -744,9 +766,11 @@ static FEDERATED_SHARE *get_share(const char *table_name, TABLE *table)
uint table_name_length, table_base_name_length;
char *tmp_table_name, *tmp_table_base_name, *table_base_name, *select_query;
// share->table_name has the file location - we want the actual table's
// name!
table_base_name= (char*) table->s->table_name;
/*
share->table_name has the file location - we want the actual table's
name!
*/
table_base_name= (char*)table->s->table_name;
DBUG_PRINT("ha_federated::get_share", ("table_name %s", table_base_name));
/*
So why does this exist? There is no way currently to init a storage engine.
......@@ -754,25 +778,12 @@ static FEDERATED_SHARE *get_share(const char *table_name, TABLE *table)
do this. Since you will not want to do this, this is probably the next
best method.
*/
if (!federated_init)
{
/* Hijack a mutex for init'ing the storage engine */
pthread_mutex_lock(&LOCK_mysql_create_db);
if (!federated_init)
{
federated_init++;
VOID(pthread_mutex_init(&federated_mutex, MY_MUTEX_INIT_FAST));
(void) hash_init(&federated_open_tables, system_charset_info, 32, 0, 0,
(hash_get_key) federated_get_key, 0, 0);
}
pthread_mutex_unlock(&LOCK_mysql_create_db);
}
pthread_mutex_lock(&federated_mutex);
table_name_length= (uint) strlen(table_name);
table_base_name_length= (uint) strlen(table_base_name);
if (!(share= (FEDERATED_SHARE *) hash_search(&federated_open_tables,
(byte *) table_name,
(byte*) table_name,
table_name_length)))
{
query.set_charset(system_charset_info);
......@@ -804,7 +815,7 @@ static FEDERATED_SHARE *get_share(const char *table_name, TABLE *table)
strmov(share->select_query, query.ptr());
DBUG_PRINT("ha_federated::get_share",
("share->select_query %s", share->select_query));
if (my_hash_insert(&federated_open_tables, (byte *) share))
if (my_hash_insert(&federated_open_tables, (byte*) share))
goto error;
thr_lock_init(&share->lock);
pthread_mutex_init(&share->mutex, MY_MUTEX_INIT_FAST);
......@@ -819,7 +830,6 @@ error2:
pthread_mutex_destroy(&share->mutex);
error:
pthread_mutex_unlock(&federated_mutex);
hash_delete(&federated_open_tables, (byte *) share);
if (share->scheme)
my_free((gptr) share->scheme, MYF(0));
my_free((gptr) share, MYF(0));
......@@ -837,15 +847,14 @@ static int free_share(FEDERATED_SHARE *share)
{
pthread_mutex_lock(&federated_mutex);
if (share->scheme)
my_free((gptr) share->scheme, MYF(0));
if (!--share->use_count)
{
hash_delete(&federated_open_tables, (byte *) share);
hash_free(&federated_open_tables);
if (share->scheme)
my_free((gptr) share->scheme, MYF(0));
hash_delete(&federated_open_tables, (byte*)share);
thr_lock_delete(&share->lock);
pthread_mutex_destroy(&share->mutex);
VOID(pthread_mutex_destroy(&share->mutex));
my_free((gptr) share, MYF(0));
}
pthread_mutex_unlock(&federated_mutex);
......@@ -900,7 +909,9 @@ int ha_federated::open(const char *name, int mode, uint test_if_locked)
share->hostname,
share->username,
share->password,
share->database, share->port, NULL, 0))
share->database,
share->port,
share->socket, 0))
{
my_error(ER_CONNECT_TO_MASTER, MYF(0), mysql_error(mysql));
DBUG_RETURN(ER_CONNECT_TO_MASTER);
......@@ -955,12 +966,9 @@ int ha_federated::close(void)
1 if NULL
0 otherwise
*/
inline uint field_in_record_is_null(TABLE * table, /* in: MySQL table
object */
Field * field, /* in: MySQL field
object */
char *record) /* in: a row in MySQL
format */
inline uint field_in_record_is_null(TABLE *table, /* in: MySQL table object */
Field *field, /* in: MySQL field object */
char *record) /* in: row in MySQL format */
{
int null_offset;
DBUG_ENTER("ha_federated::field_in_record_is_null");
......@@ -968,7 +976,7 @@ inline uint field_in_record_is_null(TABLE * table, /* in: MySQL table
if (!field->null_ptr)
DBUG_RETURN(0);
null_offset= (uint) ((char*) field->null_ptr - (char*) table->record[0]);
null_offset= (uint) ((char*)field->null_ptr - (char*)table->record[0]);
if (record[null_offset] & field->null_bit)
DBUG_RETURN(1);
......@@ -989,7 +997,7 @@ inline uint field_in_record_is_null(TABLE * table, /* in: MySQL table
Called from item_sum.cc, item_sum.cc, sql_acl.cc, sql_insert.cc,
sql_insert.cc, sql_select.cc, sql_table.cc, sql_udf.cc, and sql_update.cc.
*/
int ha_federated::write_row(byte * buf)
int ha_federated::write_row(byte* buf)
{
uint x= 0, num_fields= 0;
Field **field;
......@@ -1075,13 +1083,12 @@ int ha_federated::write_row(byte * buf)
("current query id %d field is not null query ID %d",
current_query_id, (*field)->query_id));
(*field)->val_str(&insert_field_value_string);
// quote these fields if they require it
(*field)->quote_data(&insert_field_value_string);
}
// append the field name
insert_string.append((*field)->field_name);
// quote these fields if they require it
(*field)->quote_data(&insert_field_value_string);
// append the value
values_string.append(insert_field_value_string);
insert_field_value_string.length(0);
......@@ -1197,7 +1204,7 @@ int ha_federated::update_row(const byte * old_data, byte * new_data)
field=oldvalue
*/
for (Field ** field= table->field; *field; field++, x++)
for (Field **field= table->field; *field; field++, x++)
{
/*
In all of these tests for 'has_a_primary_key', what I'm trying to
......@@ -1268,8 +1275,8 @@ int ha_federated::update_row(const byte * old_data, byte * new_data)
old_field_value.length(0);
}
update_string.append(" WHERE ");
update_string.append(where_string.ptr());
if (!has_a_primary_key)
update_string.append(where_string.c_ptr_quick());
if (! has_a_primary_key)
update_string.append(" LIMIT 1");
DBUG_PRINT("ha_federated::update_row", ("Final update query: %s",
......@@ -1315,7 +1322,7 @@ int ha_federated::delete_row(const byte * buf)
delete_string.append(share->table_base_name);
delete_string.append(" WHERE ");
for (Field ** field= table->field; *field; field++, x++)
for (Field **field= table->field; *field; field++, x++)
{
delete_string.append((*field)->field_name);
......@@ -1357,7 +1364,7 @@ int ha_federated::delete_row(const byte * buf)
index. This method, which is called in the case of an SQL statement having
a WHERE clause on a non-primary key index, simply calls index_read_idx.
*/
int ha_federated::index_read(byte * buf, const byte * key,
int ha_federated::index_read(byte* buf, const byte * key,
uint key_len __attribute__ ((unused)),
enum ha_rkey_function find_flag
__attribute__ ((unused)))
......@@ -1375,7 +1382,7 @@ int ha_federated::index_read(byte * buf, const byte * key,
a regular non-primary key index, OR is called DIRECTLY when the WHERE clause
uses a PRIMARY KEY index.
*/
int ha_federated::index_read_idx(byte * buf, uint index, const byte * key,
int ha_federated::index_read_idx(byte* buf, uint index, const byte * key,
uint key_len __attribute__ ((unused)),
enum ha_rkey_function find_flag
__attribute__ ((unused)))
......@@ -1454,7 +1461,7 @@ int ha_federated::index_init(uint keynr)
/*
Used to read forward through the index.
*/
int ha_federated::index_next(byte * buf)
int ha_federated::index_next(byte* buf)
{
DBUG_ENTER("ha_federated::index_next");
DBUG_RETURN(rnd_next(buf));
......@@ -1546,7 +1553,7 @@ int ha_federated::index_end(void)
Called from filesort.cc, records.cc, sql_handler.cc, sql_select.cc,
sql_table.cc, and sql_update.cc.
*/
int ha_federated::rnd_next(byte *buf)
int ha_federated::rnd_next(byte* buf)
{
MYSQL_ROW row;
DBUG_ENTER("ha_federated::rnd_next");
......@@ -1594,7 +1601,7 @@ void ha_federated::position(const byte *record)
Called from filesort.cc records.cc sql_insert.cc sql_select.cc sql_update.cc.
*/
int ha_federated::rnd_pos(byte * buf, byte *pos)
int ha_federated::rnd_pos(byte* buf, byte *pos)
{
DBUG_ENTER("ha_federated::rnd_pos");
/*
......@@ -1606,10 +1613,10 @@ int ha_federated::rnd_pos(byte * buf, byte *pos)
{
statistic_increment(table->in_use->status_var.ha_read_rnd_count,
&LOCK_status);
memcpy_fixed(&current_position, pos, sizeof(MYSQL_ROW_OFFSET)); // pos
// is
// not
// aligned
/*
pos is not aligned
*/
memcpy_fixed(&current_position, pos, sizeof(MYSQL_ROW_OFFSET));
result->current_row= 0;
result->data_cursor= current_position;
DBUG_RETURN(rnd_next(buf));
......@@ -1786,4 +1793,4 @@ int ha_federated::create(const char *name, TABLE *table_arg,
my_free((gptr) tmp.scheme, MYF(0));
DBUG_RETURN(0);
}
#endif /* HAVE_FEDERATED_DB */
#endif /* HAVE_FEDERATED_DB */
sql/ha_federated.h
View file @ bc430174
......@@ -174,3 +174,6 @@ public:
THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
enum thr_lock_type lock_type); //required
};
bool federated_db_init(void);
bool federated_db_end(void);
sql/handler.cc
View file @ bc430174
......@@ -364,6 +364,16 @@ int ha_init()
opt_using_transactions=1;
}
#endif
#ifdef HAVE_FEDERATED_DB
if (have_federated_db == SHOW_OPTION_YES)
{
if (federated_db_init())
{
have_federated_db= SHOW_OPTION_DISABLED;
error= 1;
}
}
#endif
#ifdef HAVE_ARCHIVE_DB
if (have_archive_db == SHOW_OPTION_YES)
{
......@@ -405,6 +415,10 @@ int ha_panic(enum ha_panic_function flag)
if (have_ndbcluster == SHOW_OPTION_YES)
error|=ndbcluster_end();
#endif
#ifdef HAVE_FEDERATED_DB
if (have_federated_db == SHOW_OPTION_YES)
error|= federated_db_end();
#endif
#ifdef HAVE_ARCHIVE_DB
if (have_archive_db == SHOW_OPTION_YES)
error|= archive_db_end();
......
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