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);
262 void db_thread_cleanup()
266 * Return the next unique index (auto-increment) for
267 * the given table. Return NULL on error.
269 * For PostgreSQL, NULL causes the auto-increment value
272 int db_next_index(JCR *jcr, B_DB *mdb, char *table, char *index)
274 strcpy(index, "NULL");
280 * Escape strings so that PostgreSQL is happy
282 * NOTE! len is the length of the old string. Your new
283 * string must be long enough (max 2*old+1) to hold
284 * the escaped output.
287 db_escape_string(char *snew, char *old, int len)
289 PQescapeString(snew, old, len);
293 * Submit a general SQL command (cmd), and for each row returned,
294 * the sqlite_handler is called with the ctx.
296 int db_sql_query(B_DB *mdb, const char *query, DB_RESULT_HANDLER *result_handler, void *ctx)
300 Dmsg0(500, "db_sql_query started\n");
303 if (sql_query(mdb, query) != 0) {
304 Mmsg(mdb->errmsg, _("Query failed: %s: ERR=%s\n"), query, sql_strerror(mdb));
306 Dmsg0(500, "db_sql_query failed\n");
309 Dmsg0(500, "db_sql_query succeeded. checking handler\n");
311 if (result_handler != NULL) {
312 Dmsg0(500, "db_sql_query invoking handler\n");
313 if ((mdb->result = sql_store_result(mdb)) != NULL) {
314 int num_fields = sql_num_fields(mdb);
316 Dmsg0(500, "db_sql_query sql_store_result suceeded\n");
317 while ((row = sql_fetch_row(mdb)) != NULL) {
319 Dmsg0(500, "db_sql_query sql_fetch_row worked\n");
320 if (result_handler(ctx, num_fields, row))
324 sql_free_result(mdb);
329 Dmsg0(500, "db_sql_query finished\n");
336 POSTGRESQL_ROW my_postgresql_fetch_row(B_DB *mdb)
339 POSTGRESQL_ROW row = NULL; // by default, return NULL
341 Dmsg0(500, "my_postgresql_fetch_row start\n");
343 if (!mdb->row || mdb->row_size < mdb->num_fields) {
344 Dmsg1(500, "we have need space of %d bytes\n", sizeof(char *) * mdb->num_fields);
347 Dmsg0(500, "my_postgresql_fetch_row freeing space\n");
350 mdb->row = (POSTGRESQL_ROW) malloc(sizeof(char *) * mdb->num_fields);
351 mdb->row_size = mdb->num_fields;
353 // now reset the row_number now that we have the space allocated
357 // if still within the result set
358 if (mdb->row_number < mdb->num_rows) {
359 Dmsg2(500, "my_postgresql_fetch_row row number '%d' is acceptable (0..%d)\n", mdb->row_number, mdb->num_rows);
360 // get each value from this row
361 for (j = 0; j < mdb->num_fields; j++) {
362 mdb->row[j] = PQgetvalue(mdb->result, mdb->row_number, j);
363 Dmsg2(500, "my_postgresql_fetch_row field '%d' has value '%s'\n", j, mdb->row[j]);
365 // increment the row number for the next call
370 Dmsg2(500, "my_postgresql_fetch_row row number '%d' is NOT acceptable (0..%d)\n", mdb->row_number, mdb->num_rows);
373 Dmsg1(500, "my_postgresql_fetch_row finishes returning %x\n", row);
378 int my_postgresql_max_length(B_DB *mdb, int field_num) {
380 // for a given column, find the max length
387 for (i = 0; i < mdb->num_rows; i++) {
388 if (PQgetisnull(mdb->result, i, field_num)) {
389 this_length = 4; // "NULL"
391 this_length = cstrlen(PQgetvalue(mdb->result, i, field_num));
394 if (max_length < this_length) {
395 max_length = this_length;
402 POSTGRESQL_FIELD * my_postgresql_fetch_field(B_DB *mdb)
406 Dmsg0(500, "my_postgresql_fetch_field starts\n");
408 if (!mdb->fields || mdb->fields_size < mdb->num_fields) {
412 Dmsg1(500, "allocating space for %d fields\n", mdb->num_fields);
413 mdb->fields = (POSTGRESQL_FIELD *)malloc(sizeof(POSTGRESQL_FIELD) * mdb->num_fields);
414 mdb->fields_size = mdb->num_fields;
416 for (i = 0; i < mdb->num_fields; i++) {
417 Dmsg1(500, "filling field %d\n", i);
418 mdb->fields[i].name = PQfname(mdb->result, i);
419 mdb->fields[i].max_length = my_postgresql_max_length(mdb, i);
420 mdb->fields[i].type = PQftype(mdb->result, i);
421 mdb->fields[i].flags = 0;
423 Dmsg4(500, "my_postgresql_fetch_field finds field '%s' has length='%d' type='%d' and IsNull=%d\n",
424 mdb->fields[i].name, mdb->fields[i].max_length, mdb->fields[i].type,
425 mdb->fields[i].flags);
429 // increment field number for the next time around
431 Dmsg0(500, "my_postgresql_fetch_field finishes\n");
432 return &mdb->fields[mdb->field_number++];
435 void my_postgresql_data_seek(B_DB *mdb, int row)
437 // set the row number to be returned on the next call
438 // to my_postgresql_fetch_row
439 mdb->row_number = row;
442 void my_postgresql_field_seek(B_DB *mdb, int field)
444 mdb->field_number = field;
448 * Note, if this routine returns 1 (failure), Bacula expects
449 * that no result has been stored.
450 * This is where QUERY_DB comes with Postgresql.
452 * Returns: 0 on success
456 int my_postgresql_query(B_DB *mdb, const char *query)
458 Dmsg0(500, "my_postgresql_query started\n");
459 // We are starting a new query. reset everything.
461 mdb->row_number = -1;
462 mdb->field_number = -1;
465 PQclear(mdb->result); /* hmm, someone forgot to free?? */
469 Dmsg1(500, "my_postgresql_query starts with '%s'\n", query);
471 for (int i=0; i < 10; i++) {
472 mdb->result = PQexec(mdb->db, query);
479 Dmsg1(50, "Query failed: %s\n", query);
483 mdb->status = PQresultStatus(mdb->result);
484 if (mdb->status == PGRES_TUPLES_OK || mdb->status == PGRES_COMMAND_OK) {
485 Dmsg1(500, "we have a result\n", query);
487 // how many fields in the set?
488 mdb->num_fields = (int)PQnfields(mdb->result);
489 Dmsg1(500, "we have %d fields\n", mdb->num_fields);
491 mdb->num_rows = PQntuples(mdb->result);
492 Dmsg1(500, "we have %d rows\n", mdb->num_rows);
494 mdb->status = 0; /* succeed */
496 Dmsg1(50, "Result status failed: %s\n", query);
500 Dmsg0(500, "my_postgresql_query finishing\n");
504 Dmsg1(500, "we failed\n", query);
505 PQclear(mdb->result);
507 mdb->status = 1; /* failed */
511 void my_postgresql_free_result(B_DB *mdb)
516 PQclear(mdb->result);
532 int my_postgresql_currval(B_DB *mdb, char *table_name)
534 // Obtain the current value of the sequence that
535 // provides the serial value for primary key of the table.
537 // currval is local to our session. It is not affected by
538 // other transactions.
540 // Determine the name of the sequence.
541 // PostgreSQL automatically creates a sequence using
542 // <table>_<column>_seq.
543 // At the time of writing, all tables used this format for
544 // for their primary key: <table>id
545 // Except for basefiles which has a primary key on baseid.
546 // Therefore, we need to special case that one table.
548 // everything else can use the PostgreSQL formula.
550 char sequence[NAMEDATALEN-1];
551 char query [NAMEDATALEN+50];
555 if (strcasecmp(table_name, "basefiles") == 0) {
556 bstrncpy(sequence, "basefiles_baseid", sizeof(sequence));
558 bstrncpy(sequence, table_name, sizeof(sequence));
559 bstrncat(sequence, "_", sizeof(sequence));
560 bstrncat(sequence, table_name, sizeof(sequence));
561 bstrncat(sequence, "id", sizeof(sequence));
564 bstrncat(sequence, "_seq", sizeof(sequence));
565 bsnprintf(query, sizeof(query), "SELECT currval('%s')", sequence);
567 Dmsg1(500, "my_postgresql_currval invoked with '%s'\n", query);
568 for (int i=0; i < 10; i++) {
569 result = PQexec(mdb->db, query);
576 Dmsg1(50, "Query failed: %s\n", query);
580 Dmsg0(500, "exec done");
582 if (PQresultStatus(result) == PGRES_TUPLES_OK) {
583 Dmsg0(500, "getting value");
584 id = atoi(PQgetvalue(result, 0, 0));
585 Dmsg2(500, "got value '%s' which became %d\n", PQgetvalue(result, 0, 0), id);
587 Dmsg1(50, "Result status failed: %s\n", query);
588 Mmsg1(&mdb->errmsg, _("error fetching currval: %s\n"), PQerrorMessage(mdb->db));
597 int my_postgresql_batch_start(JCR *jcr, B_DB *mdb)
599 char *query = "COPY batch FROM STDIN";
601 Dmsg0(500, "my_postgresql_batch_start started\n");
603 if (my_postgresql_query(mdb,
604 " CREATE TEMPORARY TABLE batch "
610 " md5 varchar)") == 1)
612 Dmsg0(500, "my_postgresql_batch_start failed\n");
616 // We are starting a new query. reset everything.
618 mdb->row_number = -1;
619 mdb->field_number = -1;
621 my_postgresql_free_result(mdb);
623 for (int i=0; i < 10; i++) {
624 mdb->result = PQexec(mdb->db, query);
631 Dmsg1(50, "Query failed: %s\n", query);
635 mdb->status = PQresultStatus(mdb->result);
636 if (mdb->status == PGRES_COPY_IN) {
637 // how many fields in the set?
638 mdb->num_fields = (int) PQnfields(mdb->result);
642 Dmsg1(50, "Result status failed: %s\n", query);
646 Dmsg0(500, "my_postgresql_batch_start finishing\n");
652 PQclear(mdb->result);
657 /* set error to something to abort operation */
658 int my_postgresql_batch_end(JCR *jcr, B_DB *mdb, const char *error)
662 Dmsg0(500, "my_postgresql_batch_end started\n");
664 if (!mdb) { /* no files ? */
669 res = PQputCopyEnd(mdb->db, error);
670 } while (res == 0 && --count > 0);
678 Dmsg0(500, "we failed\n");
680 Mmsg1(&mdb->errmsg, _("error ending batch mode: %s\n"), PQerrorMessage(mdb->db));
683 Dmsg0(500, "my_postgresql_batch_end finishing\n");
688 int my_postgresql_batch_insert(JCR *jcr, B_DB *mdb, ATTR_DBR *ar)
696 mdb->esc_name = check_pool_memory_size(mdb->esc_name, mdb->fnl*2+1);
697 my_postgresql_copy_escape(mdb->esc_name, mdb->fname, mdb->fnl);
699 mdb->esc_path = check_pool_memory_size(mdb->esc_path, mdb->pnl*2+1);
700 my_postgresql_copy_escape(mdb->esc_path, mdb->path, mdb->pnl);
702 if (ar->Digest == NULL || ar->Digest[0] == 0) {
708 len = Mmsg(mdb->cmd, "%u\t%s\t%s\t%s\t%s\t%s\n",
709 ar->FileIndex, edit_int64(ar->JobId, ed1), mdb->esc_path,
710 mdb->esc_name, ar->attr, digest);
713 res = PQputCopyData(mdb->db,
716 } while (res == 0 && --count > 0);
725 Dmsg0(500, "we failed\n");
727 Mmsg1(&mdb->errmsg, _("error ending batch mode: %s\n"), PQerrorMessage(mdb->db));
730 Dmsg0(500, "my_postgresql_batch_insert finishing\n");
736 * Escape strings so that PostgreSQL is happy on COPY
738 * NOTE! len is the length of the old string. Your new
739 * string must be long enough (max 2*old+1) to hold
740 * the escaped output.
742 char *my_postgresql_copy_escape(char *dest, char *src, size_t len)
744 /* we have to escape \t, \n, \r, \ */
747 while (len > 0 && *src) {
782 char *my_pg_batch_lock_path_query = "BEGIN; LOCK TABLE Path IN SHARE ROW EXCLUSIVE MODE";
785 char *my_pg_batch_lock_filename_query = "BEGIN; LOCK TABLE Filename IN SHARE ROW EXCLUSIVE MODE";
787 char *my_pg_batch_unlock_tables_query = "COMMIT";
789 char *my_pg_batch_fill_path_query = "INSERT INTO Path (Path) "
790 " SELECT a.Path FROM "
791 " (SELECT DISTINCT Path FROM batch) AS a "
792 " WHERE NOT EXISTS (SELECT Path FROM Path WHERE Path = a.Path) ";
795 char *my_pg_batch_fill_filename_query = "INSERT INTO Filename (Name) "
796 " SELECT a.Name FROM "
797 " (SELECT DISTINCT Name FROM batch) as a "
799 " (SELECT Name FROM Filename WHERE Name = a.Name)";
800 #endif /* HAVE_POSTGRESQL */