2 Bacula® - The Network Backup Solution
4 Copyright (C) 2003-2007 Free Software Foundation Europe e.V.
6 The main author of Bacula is Kern Sibbald, with contributions from
7 many others, a complete list can be found in the file AUTHORS.
8 This program is Free Software; you can redistribute it and/or
9 modify it under the terms of version two of the GNU General Public
10 License as published by the Free Software Foundation and included
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 Bacula® is a registered trademark of John Walker.
24 The licensor of Bacula is the Free Software Foundation Europe
25 (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
26 Switzerland, email:ftf@fsfeurope.org.
29 * Bacula Catalog Database routines specific to PostgreSQL
30 * These are PostgreSQL specific routines
32 * Dan Langille, December 2003
33 * based upon work done by Kern Sibbald, March 2000
39 /* The following is necessary so that we do not include
40 * the dummy external definition of DB.
42 #define __SQL_C /* indicate that this is sql.c */
47 #ifdef HAVE_POSTGRESQL
49 #include "postgres_ext.h" /* needed for NAMEDATALEN */
51 /* -----------------------------------------------------------------------
53 * PostgreSQL dependent defines and subroutines
55 * -----------------------------------------------------------------------
58 /* List of open databases */
59 static BQUEUE db_list = {&db_list, &db_list};
61 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
64 * Retrieve database type
74 * Initialize database data structure. In principal this should
75 * never have errors, or it is really fatal.
78 db_init_database(JCR *jcr, const char *db_name, const char *db_user, const char *db_password,
79 const char *db_address, int db_port, const char *db_socket,
80 int mult_db_connections)
85 Jmsg(jcr, M_FATAL, 0, _("A user name for PostgreSQL must be supplied.\n"));
88 P(mutex); /* lock DB queue */
89 if (!mult_db_connections) {
90 /* Look to see if DB already open */
91 for (mdb=NULL; (mdb=(B_DB *)qnext(&db_list, &mdb->bq)); ) {
92 if (bstrcmp(mdb->db_name, db_name) &&
93 bstrcmp(mdb->db_address, db_address) &&
94 mdb->db_port == db_port) {
95 Dmsg2(100, "DB REopen %d %s\n", mdb->ref_count, db_name);
98 return mdb; /* already open */
102 Dmsg0(100, "db_open first time\n");
103 mdb = (B_DB *)malloc(sizeof(B_DB));
104 memset(mdb, 0, sizeof(B_DB));
105 mdb->db_name = bstrdup(db_name);
106 mdb->db_user = bstrdup(db_user);
108 mdb->db_password = bstrdup(db_password);
111 mdb->db_address = bstrdup(db_address);
114 mdb->db_socket = bstrdup(db_socket);
116 mdb->db_port = db_port;
117 mdb->have_insert_id = TRUE;
118 mdb->errmsg = get_pool_memory(PM_EMSG); /* get error message buffer */
120 mdb->cmd = get_pool_memory(PM_EMSG); /* get command buffer */
121 mdb->cached_path = get_pool_memory(PM_FNAME);
122 mdb->cached_path_id = 0;
124 mdb->fname = get_pool_memory(PM_FNAME);
125 mdb->path = get_pool_memory(PM_FNAME);
126 mdb->esc_name = get_pool_memory(PM_FNAME);
127 mdb->esc_path = get_pool_memory(PM_FNAME);
128 mdb->allow_transactions = mult_db_connections;
129 qinsert(&db_list, &mdb->bq); /* put db in list */
135 * Now actually open the database. This can generate errors,
136 * which are returned in the errmsg
138 * DO NOT close the database or free(mdb) here !!!!
141 db_open_database(JCR *jcr, B_DB *mdb)
147 if (!PQisthreadsafe()) {
148 Jmsg(jcr, M_ABORT, 0, _("PostgreSQL configuration problem. "
149 "PostgreSQL library is not thread safe. Connot continue.\n"));
153 if (mdb->connected) {
157 mdb->connected = false;
159 if ((errstat=rwl_init(&mdb->lock)) != 0) {
161 Mmsg1(&mdb->errmsg, _("Unable to initialize DB lock. ERR=%s\n"),
162 be.bstrerror(errstat));
168 bsnprintf(buf, sizeof(buf), "%d", mdb->db_port);
174 /* If connection fails, try at 5 sec intervals for 30 seconds. */
175 for (int retry=0; retry < 6; retry++) {
176 /* connect to the database */
177 mdb->db = PQsetdbLogin(
178 mdb->db_address, /* default = localhost */
179 port, /* default port */
180 NULL, /* pg options */
181 NULL, /* tty, ignored */
182 mdb->db_name, /* database name */
183 mdb->db_user, /* login name */
184 mdb->db_password); /* password */
186 /* If no connect, try once more in case it is a timing problem */
187 if (PQstatus(mdb->db) == CONNECTION_OK) {
193 Dmsg0(50, "pg_real_connect done\n");
194 Dmsg3(50, "db_user=%s db_name=%s db_password=%s\n", mdb->db_user, mdb->db_name,
195 mdb->db_password==NULL?"(NULL)":mdb->db_password);
197 if (PQstatus(mdb->db) != CONNECTION_OK) {
198 Mmsg2(&mdb->errmsg, _("Unable to connect to PostgreSQL server.\n"
199 "Database=%s User=%s\n"
200 "It is probably not running or your password is incorrect.\n"),
201 mdb->db_name, mdb->db_user);
206 mdb->connected = true;
208 if (!check_tables_version(jcr, mdb)) {
213 sql_query(mdb, "SET datestyle TO 'ISO, YMD'");
220 db_close_database(JCR *jcr, B_DB *mdb)
225 db_end_transaction(jcr, mdb);
227 sql_free_result(mdb);
229 if (mdb->ref_count == 0) {
231 if (mdb->connected && mdb->db) {
234 rwl_destroy(&mdb->lock);
235 free_pool_memory(mdb->errmsg);
236 free_pool_memory(mdb->cmd);
237 free_pool_memory(mdb->cached_path);
238 free_pool_memory(mdb->fname);
239 free_pool_memory(mdb->path);
240 free_pool_memory(mdb->esc_name);
241 free_pool_memory(mdb->esc_path);
248 if (mdb->db_password) {
249 free(mdb->db_password);
251 if (mdb->db_address) {
252 free(mdb->db_address);
254 if (mdb->db_socket) {
255 free(mdb->db_socket);
257 my_postgresql_free_result(mdb);
263 void db_thread_cleanup()
267 * Return the next unique index (auto-increment) for
268 * the given table. Return NULL on error.
270 * For PostgreSQL, NULL causes the auto-increment value
273 int db_next_index(JCR *jcr, B_DB *mdb, char *table, char *index)
275 strcpy(index, "NULL");
281 * Escape strings so that PostgreSQL is happy
283 * NOTE! len is the length of the old string. Your new
284 * string must be long enough (max 2*old+1) to hold
285 * the escaped output.
288 db_escape_string(char *snew, char *old, int len)
290 PQescapeString(snew, old, len);
294 * Submit a general SQL command (cmd), and for each row returned,
295 * the sqlite_handler is called with the ctx.
297 int db_sql_query(B_DB *mdb, const char *query, DB_RESULT_HANDLER *result_handler, void *ctx)
301 Dmsg0(500, "db_sql_query started\n");
304 if (sql_query(mdb, query) != 0) {
305 Mmsg(mdb->errmsg, _("Query failed: %s: ERR=%s\n"), query, sql_strerror(mdb));
307 Dmsg0(500, "db_sql_query failed\n");
310 Dmsg0(500, "db_sql_query succeeded. checking handler\n");
312 if (result_handler != NULL) {
313 Dmsg0(500, "db_sql_query invoking handler\n");
314 if ((mdb->result = sql_store_result(mdb)) != NULL) {
315 int num_fields = sql_num_fields(mdb);
317 Dmsg0(500, "db_sql_query sql_store_result suceeded\n");
318 while ((row = sql_fetch_row(mdb)) != NULL) {
320 Dmsg0(500, "db_sql_query sql_fetch_row worked\n");
321 if (result_handler(ctx, num_fields, row))
325 sql_free_result(mdb);
330 Dmsg0(500, "db_sql_query finished\n");
337 POSTGRESQL_ROW my_postgresql_fetch_row(B_DB *mdb)
340 POSTGRESQL_ROW row = NULL; // by default, return NULL
342 Dmsg0(500, "my_postgresql_fetch_row start\n");
344 if (!mdb->row || mdb->row_size < mdb->num_fields) {
345 Dmsg1(500, "we have need space of %d bytes\n", sizeof(char *) * mdb->num_fields);
348 Dmsg0(500, "my_postgresql_fetch_row freeing space\n");
351 mdb->row = (POSTGRESQL_ROW) malloc(sizeof(char *) * mdb->num_fields);
352 mdb->row_size = mdb->num_fields;
354 // now reset the row_number now that we have the space allocated
358 // if still within the result set
359 if (mdb->row_number < mdb->num_rows) {
360 Dmsg2(500, "my_postgresql_fetch_row row number '%d' is acceptable (0..%d)\n", mdb->row_number, mdb->num_rows);
361 // get each value from this row
362 for (j = 0; j < mdb->num_fields; j++) {
363 mdb->row[j] = PQgetvalue(mdb->result, mdb->row_number, j);
364 Dmsg2(500, "my_postgresql_fetch_row field '%d' has value '%s'\n", j, mdb->row[j]);
366 // increment the row number for the next call
371 Dmsg2(500, "my_postgresql_fetch_row row number '%d' is NOT acceptable (0..%d)\n", mdb->row_number, mdb->num_rows);
374 Dmsg1(500, "my_postgresql_fetch_row finishes returning %x\n", row);
379 int my_postgresql_max_length(B_DB *mdb, int field_num) {
381 // for a given column, find the max length
388 for (i = 0; i < mdb->num_rows; i++) {
389 if (PQgetisnull(mdb->result, i, field_num)) {
390 this_length = 4; // "NULL"
392 this_length = cstrlen(PQgetvalue(mdb->result, i, field_num));
395 if (max_length < this_length) {
396 max_length = this_length;
403 POSTGRESQL_FIELD * my_postgresql_fetch_field(B_DB *mdb)
407 Dmsg0(500, "my_postgresql_fetch_field starts\n");
409 if (!mdb->fields || mdb->fields_size < mdb->num_fields) {
413 Dmsg1(500, "allocating space for %d fields\n", mdb->num_fields);
414 mdb->fields = (POSTGRESQL_FIELD *)malloc(sizeof(POSTGRESQL_FIELD) * mdb->num_fields);
415 mdb->fields_size = mdb->num_fields;
417 for (i = 0; i < mdb->num_fields; i++) {
418 Dmsg1(500, "filling field %d\n", i);
419 mdb->fields[i].name = PQfname(mdb->result, i);
420 mdb->fields[i].max_length = my_postgresql_max_length(mdb, i);
421 mdb->fields[i].type = PQftype(mdb->result, i);
422 mdb->fields[i].flags = 0;
424 Dmsg4(500, "my_postgresql_fetch_field finds field '%s' has length='%d' type='%d' and IsNull=%d\n",
425 mdb->fields[i].name, mdb->fields[i].max_length, mdb->fields[i].type,
426 mdb->fields[i].flags);
430 // increment field number for the next time around
432 Dmsg0(500, "my_postgresql_fetch_field finishes\n");
433 return &mdb->fields[mdb->field_number++];
436 void my_postgresql_data_seek(B_DB *mdb, int row)
438 // set the row number to be returned on the next call
439 // to my_postgresql_fetch_row
440 mdb->row_number = row;
443 void my_postgresql_field_seek(B_DB *mdb, int field)
445 mdb->field_number = field;
449 * Note, if this routine returns 1 (failure), Bacula expects
450 * that no result has been stored.
451 * This is where QUERY_DB comes with Postgresql.
453 * Returns: 0 on success
457 int my_postgresql_query(B_DB *mdb, const char *query)
459 Dmsg0(500, "my_postgresql_query started\n");
460 // We are starting a new query. reset everything.
462 mdb->row_number = -1;
463 mdb->field_number = -1;
466 PQclear(mdb->result); /* hmm, someone forgot to free?? */
470 Dmsg1(500, "my_postgresql_query starts with '%s'\n", query);
472 for (int i=0; i < 10; i++) {
473 mdb->result = PQexec(mdb->db, query);
480 Dmsg1(50, "Query failed: %s\n", query);
484 mdb->status = PQresultStatus(mdb->result);
485 if (mdb->status == PGRES_TUPLES_OK || mdb->status == PGRES_COMMAND_OK) {
486 Dmsg1(500, "we have a result\n", query);
488 // how many fields in the set?
489 mdb->num_fields = (int)PQnfields(mdb->result);
490 Dmsg1(500, "we have %d fields\n", mdb->num_fields);
492 mdb->num_rows = PQntuples(mdb->result);
493 Dmsg1(500, "we have %d rows\n", mdb->num_rows);
495 mdb->status = 0; /* succeed */
497 Dmsg1(50, "Result status failed: %s\n", query);
501 Dmsg0(500, "my_postgresql_query finishing\n");
505 Dmsg1(500, "we failed\n", query);
506 PQclear(mdb->result);
508 mdb->status = 1; /* failed */
512 void my_postgresql_free_result(B_DB *mdb)
517 PQclear(mdb->result);
533 int my_postgresql_currval(B_DB *mdb, char *table_name)
535 // Obtain the current value of the sequence that
536 // provides the serial value for primary key of the table.
538 // currval is local to our session. It is not affected by
539 // other transactions.
541 // Determine the name of the sequence.
542 // PostgreSQL automatically creates a sequence using
543 // <table>_<column>_seq.
544 // At the time of writing, all tables used this format for
545 // for their primary key: <table>id
546 // Except for basefiles which has a primary key on baseid.
547 // Therefore, we need to special case that one table.
549 // everything else can use the PostgreSQL formula.
551 char sequence[NAMEDATALEN-1];
552 char query [NAMEDATALEN+50];
556 if (strcasecmp(table_name, "basefiles") == 0) {
557 bstrncpy(sequence, "basefiles_baseid", sizeof(sequence));
559 bstrncpy(sequence, table_name, sizeof(sequence));
560 bstrncat(sequence, "_", sizeof(sequence));
561 bstrncat(sequence, table_name, sizeof(sequence));
562 bstrncat(sequence, "id", sizeof(sequence));
565 bstrncat(sequence, "_seq", sizeof(sequence));
566 bsnprintf(query, sizeof(query), "SELECT currval('%s')", sequence);
568 Dmsg1(500, "my_postgresql_currval invoked with '%s'\n", query);
569 for (int i=0; i < 10; i++) {
570 result = PQexec(mdb->db, query);
577 Dmsg1(50, "Query failed: %s\n", query);
581 Dmsg0(500, "exec done");
583 if (PQresultStatus(result) == PGRES_TUPLES_OK) {
584 Dmsg0(500, "getting value");
585 id = atoi(PQgetvalue(result, 0, 0));
586 Dmsg2(500, "got value '%s' which became %d\n", PQgetvalue(result, 0, 0), id);
588 Dmsg1(50, "Result status failed: %s\n", query);
589 Mmsg1(&mdb->errmsg, _("error fetching currval: %s\n"), PQerrorMessage(mdb->db));
598 int my_postgresql_batch_start(JCR *jcr, B_DB *mdb)
600 char *query = "COPY batch FROM STDIN";
602 Dmsg0(500, "my_postgresql_batch_start started\n");
604 if (my_postgresql_query(mdb,
605 " CREATE TEMPORARY TABLE batch "
611 " md5 varchar)") == 1)
613 Dmsg0(500, "my_postgresql_batch_start failed\n");
617 // We are starting a new query. reset everything.
619 mdb->row_number = -1;
620 mdb->field_number = -1;
622 if (mdb->result != NULL) {
623 my_postgresql_free_result(mdb);
626 for (int i=0; i < 10; i++) {
627 mdb->result = PQexec(mdb->db, query);
634 Dmsg1(50, "Query failed: %s\n", query);
638 mdb->status = PQresultStatus(mdb->result);
639 if (mdb->status == PGRES_COPY_IN) {
640 // how many fields in the set?
641 mdb->num_fields = (int) PQnfields(mdb->result);
645 Dmsg1(50, "Result status failed: %s\n", query);
649 Dmsg0(500, "my_postgresql_batch_start finishing\n");
655 PQclear(mdb->result);
660 /* set error to something to abort operation */
661 int my_postgresql_batch_end(JCR *jcr, B_DB *mdb, const char *error)
665 Dmsg0(500, "my_postgresql_batch_end started\n");
667 if (!mdb) { /* no files ? */
672 res = PQputCopyEnd(mdb->db, error);
673 } while (res == 0 && --count > 0);
681 Dmsg0(500, "we failed\n");
683 Mmsg1(&mdb->errmsg, _("error ending batch mode: %s\n"), PQerrorMessage(mdb->db));
686 Dmsg0(500, "my_postgresql_batch_end finishing\n");
691 int my_postgresql_batch_insert(JCR *jcr, B_DB *mdb, ATTR_DBR *ar)
699 mdb->esc_name = check_pool_memory_size(mdb->esc_name, mdb->fnl*2+1);
700 my_postgresql_copy_escape(mdb->esc_name, mdb->fname, mdb->fnl);
702 mdb->esc_path = check_pool_memory_size(mdb->esc_path, mdb->pnl*2+1);
703 my_postgresql_copy_escape(mdb->esc_path, mdb->path, mdb->pnl);
705 if (ar->Digest == NULL || ar->Digest[0] == 0) {
711 len = Mmsg(mdb->cmd, "%u\t%s\t%s\t%s\t%s\t%s\n",
712 ar->FileIndex, edit_int64(ar->JobId, ed1), mdb->esc_path,
713 mdb->esc_name, ar->attr, digest);
716 res = PQputCopyData(mdb->db,
719 } while (res == 0 && --count > 0);
728 Dmsg0(500, "we failed\n");
730 Mmsg1(&mdb->errmsg, _("error ending batch mode: %s\n"), PQerrorMessage(mdb->db));
733 Dmsg0(500, "my_postgresql_batch_insert finishing\n");
739 * Escape strings so that PostgreSQL is happy on COPY
741 * NOTE! len is the length of the old string. Your new
742 * string must be long enough (max 2*old+1) to hold
743 * the escaped output.
745 char *my_postgresql_copy_escape(char *dest, char *src, size_t len)
747 /* we have to escape \t, \n, \r, \ */
750 while (len > 0 && *src) {
785 char *my_pg_batch_lock_path_query = "BEGIN; LOCK TABLE Path IN SHARE ROW EXCLUSIVE MODE";
788 char *my_pg_batch_lock_filename_query = "BEGIN; LOCK TABLE Filename IN SHARE ROW EXCLUSIVE MODE";
790 char *my_pg_batch_unlock_tables_query = "COMMIT";
792 char *my_pg_batch_fill_path_query = "INSERT INTO Path (Path) "
793 " SELECT a.Path FROM "
794 " (SELECT DISTINCT Path FROM batch) AS a "
795 " WHERE NOT EXISTS (SELECT Path FROM Path WHERE Path = a.Path) ";
798 char *my_pg_batch_fill_filename_query = "INSERT INTO Filename (Name) "
799 " SELECT a.Name FROM "
800 " (SELECT DISTINCT Name FROM batch) as a "
802 " (SELECT Name FROM Filename WHERE Name = a.Name)";
803 #endif /* HAVE_POSTGRESQL */