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 Kern Sibbald.
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 */
50 #include "pg_config_manual.h" /* get NAMEDATALEN on version 8.3 or later */
52 /* -----------------------------------------------------------------------
54 * PostgreSQL dependent defines and subroutines
56 * -----------------------------------------------------------------------
59 /* List of open databases */
60 static BQUEUE db_list = {&db_list, &db_list};
62 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
65 * Retrieve database type
75 * Initialize database data structure. In principal this should
76 * never have errors, or it is really fatal.
79 db_init_database(JCR *jcr, const char *db_name, const char *db_user, const char *db_password,
80 const char *db_address, int db_port, const char *db_socket,
81 int mult_db_connections)
86 Jmsg(jcr, M_FATAL, 0, _("A user name for PostgreSQL must be supplied.\n"));
89 P(mutex); /* lock DB queue */
90 if (!mult_db_connections) {
91 /* Look to see if DB already open */
92 for (mdb=NULL; (mdb=(B_DB *)qnext(&db_list, &mdb->bq)); ) {
93 if (bstrcmp(mdb->db_name, db_name) &&
94 bstrcmp(mdb->db_address, db_address) &&
95 mdb->db_port == db_port) {
96 Dmsg2(100, "DB REopen %d %s\n", mdb->ref_count, db_name);
99 return mdb; /* already open */
103 Dmsg0(100, "db_open first time\n");
104 mdb = (B_DB *)malloc(sizeof(B_DB));
105 memset(mdb, 0, sizeof(B_DB));
106 mdb->db_name = bstrdup(db_name);
107 mdb->db_user = bstrdup(db_user);
109 mdb->db_password = bstrdup(db_password);
112 mdb->db_address = bstrdup(db_address);
115 mdb->db_socket = bstrdup(db_socket);
117 mdb->db_port = db_port;
118 mdb->have_insert_id = TRUE;
119 mdb->errmsg = get_pool_memory(PM_EMSG); /* get error message buffer */
121 mdb->cmd = get_pool_memory(PM_EMSG); /* get command buffer */
122 mdb->cached_path = get_pool_memory(PM_FNAME);
123 mdb->cached_path_id = 0;
125 mdb->fname = get_pool_memory(PM_FNAME);
126 mdb->path = get_pool_memory(PM_FNAME);
127 mdb->esc_name = get_pool_memory(PM_FNAME);
128 mdb->esc_path = get_pool_memory(PM_FNAME);
129 mdb->allow_transactions = mult_db_connections;
130 qinsert(&db_list, &mdb->bq); /* put db in list */
135 /* Check that the database correspond to the encoding we want */
136 static bool check_database_encoding(JCR *jcr, B_DB *mdb)
141 if (!db_sql_query(mdb, "SELECT getdatabaseencoding()", NULL, NULL)) {
142 Jmsg(jcr, M_ERROR, 0, "%s", mdb->errmsg);
146 if ((row = sql_fetch_row(mdb)) == NULL) {
147 Mmsg1(mdb->errmsg, _("error fetching row: %s\n"), sql_strerror(mdb));
148 Jmsg(jcr, M_ERROR, 0, "Can't check database encoding %s", mdb->errmsg);
150 ret = bstrcmp(row[0], "SQL_ASCII");
153 _("Encoding error for database \"%s\". Wanted SQL_ASCII, got %s\n"),
154 mdb->db_name, row[0]);
155 Jmsg(jcr, M_WARNING, 0, "%s", mdb->errmsg);
156 Dmsg1(50, "%s", mdb->errmsg);
163 * Now actually open the database. This can generate errors,
164 * which are returned in the errmsg
166 * DO NOT close the database or free(mdb) here !!!!
169 db_open_database(JCR *jcr, B_DB *mdb)
174 #ifdef xxx /* require libpq >= 8.2 */
175 if (!PQisthreadsafe()) {
176 Jmsg(jcr, M_ABORT, 0, _("PostgreSQL configuration problem. "
177 "PostgreSQL library is not thread safe. Cannot continue.\n"));
181 if (mdb->connected) {
185 mdb->connected = false;
187 if ((errstat=rwl_init(&mdb->lock)) != 0) {
189 Mmsg1(&mdb->errmsg, _("Unable to initialize DB lock. ERR=%s\n"),
190 be.bstrerror(errstat));
196 bsnprintf(buf, sizeof(buf), "%d", mdb->db_port);
202 /* If connection fails, try at 5 sec intervals for 30 seconds. */
203 for (int retry=0; retry < 6; retry++) {
204 /* connect to the database */
205 mdb->db = PQsetdbLogin(
206 mdb->db_address, /* default = localhost */
207 port, /* default port */
208 NULL, /* pg options */
209 NULL, /* tty, ignored */
210 mdb->db_name, /* database name */
211 mdb->db_user, /* login name */
212 mdb->db_password); /* password */
214 /* If no connect, try once more in case it is a timing problem */
215 if (PQstatus(mdb->db) == CONNECTION_OK) {
221 Dmsg0(50, "pg_real_connect done\n");
222 Dmsg3(50, "db_user=%s db_name=%s db_password=%s\n", mdb->db_user, mdb->db_name,
223 mdb->db_password==NULL?"(NULL)":mdb->db_password);
225 if (PQstatus(mdb->db) != CONNECTION_OK) {
226 Mmsg2(&mdb->errmsg, _("Unable to connect to PostgreSQL server.\n"
227 "Database=%s User=%s\n"
228 "It is probably not running or your password is incorrect.\n"),
229 mdb->db_name, mdb->db_user);
234 mdb->connected = true;
236 if (!check_tables_version(jcr, mdb)) {
241 sql_query(mdb, "SET datestyle TO 'ISO, YMD'");
243 /* tell PostgreSQL we are using standard conforming strings
244 and avoid warnings such as:
245 WARNING: nonstandard use of \\ in a string literal
247 sql_query(mdb, "set standard_conforming_strings=on");
249 /* check that encoding is SQL_ASCII */
250 check_database_encoding(jcr, mdb);
257 db_close_database(JCR *jcr, B_DB *mdb)
262 db_end_transaction(jcr, mdb);
264 sql_free_result(mdb);
266 if (mdb->ref_count == 0) {
268 if (mdb->connected && mdb->db) {
271 rwl_destroy(&mdb->lock);
272 free_pool_memory(mdb->errmsg);
273 free_pool_memory(mdb->cmd);
274 free_pool_memory(mdb->cached_path);
275 free_pool_memory(mdb->fname);
276 free_pool_memory(mdb->path);
277 free_pool_memory(mdb->esc_name);
278 free_pool_memory(mdb->esc_path);
285 if (mdb->db_password) {
286 free(mdb->db_password);
288 if (mdb->db_address) {
289 free(mdb->db_address);
291 if (mdb->db_socket) {
292 free(mdb->db_socket);
299 void db_thread_cleanup()
303 * Return the next unique index (auto-increment) for
304 * the given table. Return NULL on error.
306 * For PostgreSQL, NULL causes the auto-increment value
309 int db_next_index(JCR *jcr, B_DB *mdb, char *table, char *index)
311 strcpy(index, "NULL");
317 * Escape strings so that PostgreSQL is happy
319 * NOTE! len is the length of the old string. Your new
320 * string must be long enough (max 2*old+1) to hold
321 * the escaped output.
324 db_escape_string(JCR *jcr, B_DB *mdb, char *snew, char *old, int len)
328 PQescapeStringConn(mdb->db, snew, old, len, &error);
330 Jmsg(jcr, M_FATAL, 0, _("PQescapeStringConn returned non-zero.\n"));
331 /* error on encoding, probably invalid multibyte encoding in the source string
332 see PQescapeStringConn documentation for details. */
333 Dmsg0(500, "PQescapeStringConn failed\n");
338 * Submit a general SQL command (cmd), and for each row returned,
339 * the sqlite_handler is called with the ctx.
341 bool db_sql_query(B_DB *mdb, const char *query, DB_RESULT_HANDLER *result_handler, void *ctx)
345 Dmsg0(500, "db_sql_query started\n");
348 if (sql_query(mdb, query) != 0) {
349 Mmsg(mdb->errmsg, _("Query failed: %s: ERR=%s\n"), query, sql_strerror(mdb));
351 Dmsg0(500, "db_sql_query failed\n");
354 Dmsg0(500, "db_sql_query succeeded. checking handler\n");
356 if (result_handler != NULL) {
357 Dmsg0(500, "db_sql_query invoking handler\n");
358 if ((mdb->result = sql_store_result(mdb)) != NULL) {
359 int num_fields = sql_num_fields(mdb);
361 Dmsg0(500, "db_sql_query sql_store_result suceeded\n");
362 while ((row = sql_fetch_row(mdb)) != NULL) {
364 Dmsg0(500, "db_sql_query sql_fetch_row worked\n");
365 if (result_handler(ctx, num_fields, row))
369 sql_free_result(mdb);
374 Dmsg0(500, "db_sql_query finished\n");
381 POSTGRESQL_ROW my_postgresql_fetch_row(B_DB *mdb)
384 POSTGRESQL_ROW row = NULL; // by default, return NULL
386 Dmsg0(500, "my_postgresql_fetch_row start\n");
388 if (!mdb->row || mdb->row_size < mdb->num_fields) {
389 int num_fields = mdb->num_fields;
390 Dmsg1(500, "we have need space of %d bytes\n", sizeof(char *) * mdb->num_fields);
393 Dmsg0(500, "my_postgresql_fetch_row freeing space\n");
396 num_fields += 20; /* add a bit extra */
397 mdb->row = (POSTGRESQL_ROW)malloc(sizeof(char *) * num_fields);
398 mdb->row_size = num_fields;
400 // now reset the row_number now that we have the space allocated
404 // if still within the result set
405 if (mdb->row_number < mdb->num_rows) {
406 Dmsg2(500, "my_postgresql_fetch_row row number '%d' is acceptable (0..%d)\n", mdb->row_number, mdb->num_rows);
407 // get each value from this row
408 for (j = 0; j < mdb->num_fields; j++) {
409 mdb->row[j] = PQgetvalue(mdb->result, mdb->row_number, j);
410 Dmsg2(500, "my_postgresql_fetch_row field '%d' has value '%s'\n", j, mdb->row[j]);
412 // increment the row number for the next call
417 Dmsg2(500, "my_postgresql_fetch_row row number '%d' is NOT acceptable (0..%d)\n", mdb->row_number, mdb->num_rows);
420 Dmsg1(500, "my_postgresql_fetch_row finishes returning %p\n", row);
425 int my_postgresql_max_length(B_DB *mdb, int field_num) {
427 // for a given column, find the max length
434 for (i = 0; i < mdb->num_rows; i++) {
435 if (PQgetisnull(mdb->result, i, field_num)) {
436 this_length = 4; // "NULL"
438 this_length = cstrlen(PQgetvalue(mdb->result, i, field_num));
441 if (max_length < this_length) {
442 max_length = this_length;
449 POSTGRESQL_FIELD * my_postgresql_fetch_field(B_DB *mdb)
453 Dmsg0(500, "my_postgresql_fetch_field starts\n");
455 if (!mdb->fields || mdb->fields_size < mdb->num_fields) {
459 Dmsg1(500, "allocating space for %d fields\n", mdb->num_fields);
460 mdb->fields = (POSTGRESQL_FIELD *)malloc(sizeof(POSTGRESQL_FIELD) * mdb->num_fields);
461 mdb->fields_size = mdb->num_fields;
463 for (i = 0; i < mdb->num_fields; i++) {
464 Dmsg1(500, "filling field %d\n", i);
465 mdb->fields[i].name = PQfname(mdb->result, i);
466 mdb->fields[i].max_length = my_postgresql_max_length(mdb, i);
467 mdb->fields[i].type = PQftype(mdb->result, i);
468 mdb->fields[i].flags = 0;
470 Dmsg4(500, "my_postgresql_fetch_field finds field '%s' has length='%d' type='%d' and IsNull=%d\n",
471 mdb->fields[i].name, mdb->fields[i].max_length, mdb->fields[i].type,
472 mdb->fields[i].flags);
476 // increment field number for the next time around
478 Dmsg0(500, "my_postgresql_fetch_field finishes\n");
479 return &mdb->fields[mdb->field_number++];
482 void my_postgresql_data_seek(B_DB *mdb, int row)
484 // set the row number to be returned on the next call
485 // to my_postgresql_fetch_row
486 mdb->row_number = row;
489 void my_postgresql_field_seek(B_DB *mdb, int field)
491 mdb->field_number = field;
495 * Note, if this routine returns 1 (failure), Bacula expects
496 * that no result has been stored.
497 * This is where QUERY_DB comes with Postgresql.
499 * Returns: 0 on success
503 int my_postgresql_query(B_DB *mdb, const char *query)
505 Dmsg0(500, "my_postgresql_query started\n");
506 // We are starting a new query. reset everything.
508 mdb->row_number = -1;
509 mdb->field_number = -1;
512 PQclear(mdb->result); /* hmm, someone forgot to free?? */
516 Dmsg1(500, "my_postgresql_query starts with '%s'\n", query);
518 for (int i=0; i < 10; i++) {
519 mdb->result = PQexec(mdb->db, query);
526 Dmsg1(50, "Query failed: %s\n", query);
530 mdb->status = PQresultStatus(mdb->result);
531 if (mdb->status == PGRES_TUPLES_OK || mdb->status == PGRES_COMMAND_OK) {
532 Dmsg1(500, "we have a result\n", query);
534 // how many fields in the set?
535 mdb->num_fields = (int)PQnfields(mdb->result);
536 Dmsg1(500, "we have %d fields\n", mdb->num_fields);
538 mdb->num_rows = PQntuples(mdb->result);
539 Dmsg1(500, "we have %d rows\n", mdb->num_rows);
541 mdb->status = 0; /* succeed */
543 Dmsg1(50, "Result status failed: %s\n", query);
547 Dmsg0(500, "my_postgresql_query finishing\n");
551 Dmsg1(500, "we failed\n", query);
552 PQclear(mdb->result);
554 mdb->status = 1; /* failed */
558 void my_postgresql_free_result(B_DB *mdb)
563 PQclear(mdb->result);
579 int my_postgresql_currval(B_DB *mdb, const char *table_name)
581 // Obtain the current value of the sequence that
582 // provides the serial value for primary key of the table.
584 // currval is local to our session. It is not affected by
585 // other transactions.
587 // Determine the name of the sequence.
588 // PostgreSQL automatically creates a sequence using
589 // <table>_<column>_seq.
590 // At the time of writing, all tables used this format for
591 // for their primary key: <table>id
592 // Except for basefiles which has a primary key on baseid.
593 // Therefore, we need to special case that one table.
595 // everything else can use the PostgreSQL formula.
597 char sequence[NAMEDATALEN-1];
598 char query [NAMEDATALEN+50];
602 if (strcasecmp(table_name, "basefiles") == 0) {
603 bstrncpy(sequence, "basefiles_baseid", sizeof(sequence));
605 bstrncpy(sequence, table_name, sizeof(sequence));
606 bstrncat(sequence, "_", sizeof(sequence));
607 bstrncat(sequence, table_name, sizeof(sequence));
608 bstrncat(sequence, "id", sizeof(sequence));
611 bstrncat(sequence, "_seq", sizeof(sequence));
612 bsnprintf(query, sizeof(query), "SELECT currval('%s')", sequence);
614 Dmsg1(500, "my_postgresql_currval invoked with '%s'\n", query);
615 for (int i=0; i < 10; i++) {
616 result = PQexec(mdb->db, query);
623 Dmsg1(50, "Query failed: %s\n", query);
627 Dmsg0(500, "exec done");
629 if (PQresultStatus(result) == PGRES_TUPLES_OK) {
630 Dmsg0(500, "getting value");
631 id = atoi(PQgetvalue(result, 0, 0));
632 Dmsg2(500, "got value '%s' which became %d\n", PQgetvalue(result, 0, 0), id);
634 Dmsg1(50, "Result status failed: %s\n", query);
635 Mmsg1(&mdb->errmsg, _("error fetching currval: %s\n"), PQerrorMessage(mdb->db));
644 #ifdef HAVE_BATCH_FILE_INSERT
646 int my_postgresql_batch_start(JCR *jcr, B_DB *mdb)
648 const char *query = "COPY batch FROM STDIN";
650 Dmsg0(500, "my_postgresql_batch_start started\n");
652 if (my_postgresql_query(mdb,
653 "CREATE TEMPORARY TABLE batch ("
659 "md5 varchar)") == 1)
661 Dmsg0(500, "my_postgresql_batch_start failed\n");
665 // We are starting a new query. reset everything.
667 mdb->row_number = -1;
668 mdb->field_number = -1;
670 my_postgresql_free_result(mdb);
672 for (int i=0; i < 10; i++) {
673 mdb->result = PQexec(mdb->db, query);
680 Dmsg1(50, "Query failed: %s\n", query);
684 mdb->status = PQresultStatus(mdb->result);
685 if (mdb->status == PGRES_COPY_IN) {
686 // how many fields in the set?
687 mdb->num_fields = (int) PQnfields(mdb->result);
691 Dmsg1(50, "Result status failed: %s\n", query);
695 Dmsg0(500, "my_postgresql_batch_start finishing\n");
700 Mmsg1(&mdb->errmsg, _("error starting batch mode: %s"), PQerrorMessage(mdb->db));
702 PQclear(mdb->result);
707 /* set error to something to abort operation */
708 int my_postgresql_batch_end(JCR *jcr, B_DB *mdb, const char *error)
712 Dmsg0(500, "my_postgresql_batch_end started\n");
714 if (!mdb) { /* no files ? */
719 res = PQputCopyEnd(mdb->db, error);
720 } while (res == 0 && --count > 0);
728 Dmsg0(500, "we failed\n");
730 Mmsg1(&mdb->errmsg, _("error ending batch mode: %s"), PQerrorMessage(mdb->db));
733 Dmsg0(500, "my_postgresql_batch_end finishing\n");
738 int my_postgresql_batch_insert(JCR *jcr, B_DB *mdb, ATTR_DBR *ar)
746 mdb->esc_name = check_pool_memory_size(mdb->esc_name, mdb->fnl*2+1);
747 my_postgresql_copy_escape(mdb->esc_name, mdb->fname, mdb->fnl);
749 mdb->esc_path = check_pool_memory_size(mdb->esc_path, mdb->pnl*2+1);
750 my_postgresql_copy_escape(mdb->esc_path, mdb->path, mdb->pnl);
752 if (ar->Digest == NULL || ar->Digest[0] == 0) {
758 len = Mmsg(mdb->cmd, "%u\t%s\t%s\t%s\t%s\t%s\n",
759 ar->FileIndex, edit_int64(ar->JobId, ed1), mdb->esc_path,
760 mdb->esc_name, ar->attr, digest);
763 res = PQputCopyData(mdb->db,
766 } while (res == 0 && --count > 0);
775 Dmsg0(500, "we failed\n");
777 Mmsg1(&mdb->errmsg, _("error ending batch mode: %s"), PQerrorMessage(mdb->db));
780 Dmsg0(500, "my_postgresql_batch_insert finishing\n");
785 #endif /* HAVE_BATCH_FILE_INSERT */
788 * Escape strings so that PostgreSQL is happy on COPY
790 * NOTE! len is the length of the old string. Your new
791 * string must be long enough (max 2*old+1) to hold
792 * the escaped output.
794 char *my_postgresql_copy_escape(char *dest, char *src, size_t len)
796 /* we have to escape \t, \n, \r, \ */
799 while (len > 0 && *src) {
834 #ifdef HAVE_BATCH_FILE_INSERT
835 const char *my_pg_batch_lock_path_query =
836 "BEGIN; LOCK TABLE Path IN SHARE ROW EXCLUSIVE MODE";
839 const char *my_pg_batch_lock_filename_query =
840 "BEGIN; LOCK TABLE Filename IN SHARE ROW EXCLUSIVE MODE";
842 const char *my_pg_batch_unlock_tables_query = "COMMIT";
844 const char *my_pg_batch_fill_path_query =
845 "INSERT INTO Path (Path) "
846 "SELECT a.Path FROM "
847 "(SELECT DISTINCT Path FROM batch) AS a "
848 "WHERE NOT EXISTS (SELECT Path FROM Path WHERE Path = a.Path) ";
851 const char *my_pg_batch_fill_filename_query =
852 "INSERT INTO Filename (Name) "
853 "SELECT a.Name FROM "
854 "(SELECT DISTINCT Name FROM batch) as a "
856 "(SELECT Name FROM Filename WHERE Name = a.Name)";
857 #endif /* HAVE_BATCH_FILE_INSERT */
859 #endif /* HAVE_POSTGRESQL */