Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * streamutil.c - utility functions for pg_basebackup, pg_receivewal and
4 : * pg_recvlogical
5 : *
6 : * Author: Magnus Hagander <magnus@hagander.net>
7 : *
8 : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
9 : *
10 : * IDENTIFICATION
11 : * src/bin/pg_basebackup/streamutil.c
12 : *-------------------------------------------------------------------------
13 : */
14 :
15 : #include "postgres_fe.h"
16 :
17 : #include <sys/time.h>
18 : #include <unistd.h>
19 :
20 : #include "access/xlog_internal.h"
21 : #include "common/connect.h"
22 : #include "common/file_perm.h"
23 : #include "common/logging.h"
24 : #include "common/string.h"
25 : #include "datatype/timestamp.h"
26 : #include "port/pg_bswap.h"
27 : #include "pqexpbuffer.h"
28 : #include "streamutil.h"
29 :
30 : #define ERRCODE_DUPLICATE_OBJECT "42710"
31 :
32 : int WalSegSz;
33 :
34 : static bool RetrieveDataDirCreatePerm(PGconn *conn);
35 :
36 : /* SHOW command for replication connection was introduced in version 10 */
37 : #define MINIMUM_VERSION_FOR_SHOW_CMD 100000
38 :
39 : /*
40 : * Group access is supported from version 11.
41 : */
42 : #define MINIMUM_VERSION_FOR_GROUP_ACCESS 110000
43 :
44 : const char *progname;
45 : char *connection_string = NULL;
46 : char *dbhost = NULL;
47 : char *dbuser = NULL;
48 : char *dbport = NULL;
49 : char *dbname = NULL;
50 : int dbgetpassword = 0; /* 0=auto, -1=never, 1=always */
51 : static char *password = NULL;
52 : PGconn *conn = NULL;
53 :
54 : /*
55 : * Connect to the server. Returns a valid PGconn pointer if connected,
56 : * or NULL on non-permanent error. On permanent error, the function will
57 : * call exit(1) directly.
58 : */
59 : PGconn *
60 0 : GetConnection(void)
61 : {
62 0 : PGconn *tmpconn;
63 0 : int argcount = 7; /* dbname, replication, fallback_app_name,
64 : * host, user, port, password */
65 0 : int i;
66 0 : const char **keywords;
67 0 : const char **values;
68 0 : const char *tmpparam;
69 0 : bool need_password;
70 0 : PQconninfoOption *conn_opts = NULL;
71 0 : PQconninfoOption *conn_opt;
72 0 : char *err_msg = NULL;
73 :
74 : /*
75 : * pg_recvlogical uses dbname only; others use connection_string only.
76 : * (Note: both variables will be NULL if there's no command line options.)
77 : */
78 0 : Assert(dbname == NULL || connection_string == NULL);
79 :
80 : /*
81 : * Merge the connection info inputs given in form of connection string,
82 : * options and default values (dbname=replication, replication=true, etc.)
83 : */
84 0 : i = 0;
85 0 : if (connection_string)
86 : {
87 0 : conn_opts = PQconninfoParse(connection_string, &err_msg);
88 0 : if (conn_opts == NULL)
89 0 : pg_fatal("%s", err_msg);
90 :
91 0 : for (conn_opt = conn_opts; conn_opt->keyword != NULL; conn_opt++)
92 : {
93 0 : if (conn_opt->val != NULL && conn_opt->val[0] != '\0')
94 0 : argcount++;
95 0 : }
96 :
97 0 : keywords = pg_malloc0((argcount + 1) * sizeof(*keywords));
98 0 : values = pg_malloc0((argcount + 1) * sizeof(*values));
99 :
100 : /*
101 : * Set dbname here already, so it can be overridden by a dbname in the
102 : * connection string.
103 : */
104 0 : keywords[i] = "dbname";
105 0 : values[i] = "replication";
106 0 : i++;
107 :
108 0 : for (conn_opt = conn_opts; conn_opt->keyword != NULL; conn_opt++)
109 : {
110 0 : if (conn_opt->val != NULL && conn_opt->val[0] != '\0')
111 : {
112 0 : keywords[i] = conn_opt->keyword;
113 0 : values[i] = conn_opt->val;
114 0 : i++;
115 0 : }
116 0 : }
117 0 : }
118 : else
119 : {
120 0 : keywords = pg_malloc0((argcount + 1) * sizeof(*keywords));
121 0 : values = pg_malloc0((argcount + 1) * sizeof(*values));
122 0 : keywords[i] = "dbname";
123 0 : values[i] = (dbname == NULL) ? "replication" : dbname;
124 0 : i++;
125 : }
126 :
127 0 : keywords[i] = "replication";
128 0 : values[i] = (dbname == NULL) ? "true" : "database";
129 0 : i++;
130 0 : keywords[i] = "fallback_application_name";
131 0 : values[i] = progname;
132 0 : i++;
133 :
134 0 : if (dbhost)
135 : {
136 0 : keywords[i] = "host";
137 0 : values[i] = dbhost;
138 0 : i++;
139 0 : }
140 0 : if (dbuser)
141 : {
142 0 : keywords[i] = "user";
143 0 : values[i] = dbuser;
144 0 : i++;
145 0 : }
146 0 : if (dbport)
147 : {
148 0 : keywords[i] = "port";
149 0 : values[i] = dbport;
150 0 : i++;
151 0 : }
152 :
153 : /* If -W was given, force prompt for password, but only the first time */
154 0 : need_password = (dbgetpassword == 1 && !password);
155 :
156 0 : do
157 : {
158 : /* Get a new password if appropriate */
159 0 : if (need_password)
160 : {
161 0 : free(password);
162 0 : password = simple_prompt("Password: ", false);
163 0 : need_password = false;
164 0 : }
165 :
166 : /* Use (or reuse, on a subsequent connection) password if we have it */
167 0 : if (password)
168 : {
169 0 : keywords[i] = "password";
170 0 : values[i] = password;
171 0 : }
172 : else
173 : {
174 0 : keywords[i] = NULL;
175 0 : values[i] = NULL;
176 : }
177 :
178 : /*
179 : * Only expand dbname when we did not already parse the argument as a
180 : * connection string ourselves.
181 : */
182 0 : tmpconn = PQconnectdbParams(keywords, values, !connection_string);
183 :
184 : /*
185 : * If there is too little memory even to allocate the PGconn object
186 : * and PQconnectdbParams returns NULL, we call exit(1) directly.
187 : */
188 0 : if (!tmpconn)
189 0 : pg_fatal("could not connect to server");
190 :
191 : /* If we need a password and -w wasn't given, loop back and get one */
192 0 : if (PQstatus(tmpconn) == CONNECTION_BAD &&
193 0 : PQconnectionNeedsPassword(tmpconn) &&
194 0 : dbgetpassword != -1)
195 : {
196 0 : PQfinish(tmpconn);
197 0 : need_password = true;
198 0 : }
199 0 : }
200 0 : while (need_password);
201 :
202 0 : if (PQstatus(tmpconn) != CONNECTION_OK)
203 : {
204 0 : pg_log_error("%s", PQerrorMessage(tmpconn));
205 0 : PQfinish(tmpconn);
206 0 : free(values);
207 0 : free(keywords);
208 0 : PQconninfoFree(conn_opts);
209 0 : return NULL;
210 : }
211 :
212 : /* Connection ok! */
213 0 : free(values);
214 0 : free(keywords);
215 0 : PQconninfoFree(conn_opts);
216 :
217 : /*
218 : * Set always-secure search path, so malicious users can't get control.
219 : * The capacity to run normal SQL queries was added in PostgreSQL 10, so
220 : * the search path cannot be changed (by us or attackers) on earlier
221 : * versions.
222 : */
223 0 : if (dbname != NULL && PQserverVersion(tmpconn) >= 100000)
224 : {
225 0 : PGresult *res;
226 :
227 0 : res = PQexec(tmpconn, ALWAYS_SECURE_SEARCH_PATH_SQL);
228 0 : if (PQresultStatus(res) != PGRES_TUPLES_OK)
229 : {
230 0 : pg_log_error("could not clear \"search_path\": %s",
231 : PQerrorMessage(tmpconn));
232 0 : PQclear(res);
233 0 : PQfinish(tmpconn);
234 0 : exit(1);
235 : }
236 0 : PQclear(res);
237 0 : }
238 :
239 : /*
240 : * Ensure we have the same value of integer_datetimes (now always "on") as
241 : * the server we are connecting to.
242 : */
243 0 : tmpparam = PQparameterStatus(tmpconn, "integer_datetimes");
244 0 : if (!tmpparam)
245 : {
246 0 : pg_log_error("could not determine server setting for \"integer_datetimes\"");
247 0 : PQfinish(tmpconn);
248 0 : exit(1);
249 : }
250 :
251 0 : if (strcmp(tmpparam, "on") != 0)
252 : {
253 0 : pg_log_error("\"integer_datetimes\" compile flag does not match server");
254 0 : PQfinish(tmpconn);
255 0 : exit(1);
256 : }
257 :
258 : /*
259 : * Retrieve the source data directory mode and use it to construct a umask
260 : * for creating directories and files.
261 : */
262 0 : if (!RetrieveDataDirCreatePerm(tmpconn))
263 : {
264 0 : PQfinish(tmpconn);
265 0 : exit(1);
266 : }
267 :
268 0 : return tmpconn;
269 0 : }
270 :
271 : /*
272 : * From version 10, explicitly set wal segment size using SHOW wal_segment_size
273 : * since ControlFile is not accessible here.
274 : */
275 : bool
276 0 : RetrieveWalSegSize(PGconn *conn)
277 : {
278 0 : PGresult *res;
279 0 : char xlog_unit[3];
280 0 : int xlog_val,
281 0 : multiplier = 1;
282 :
283 : /* check connection existence */
284 0 : Assert(conn != NULL);
285 :
286 : /* for previous versions set the default xlog seg size */
287 0 : if (PQserverVersion(conn) < MINIMUM_VERSION_FOR_SHOW_CMD)
288 : {
289 0 : WalSegSz = DEFAULT_XLOG_SEG_SIZE;
290 0 : return true;
291 : }
292 :
293 0 : res = PQexec(conn, "SHOW wal_segment_size");
294 0 : if (PQresultStatus(res) != PGRES_TUPLES_OK)
295 : {
296 0 : pg_log_error("could not send replication command \"%s\": %s",
297 : "SHOW wal_segment_size", PQerrorMessage(conn));
298 :
299 0 : PQclear(res);
300 0 : return false;
301 : }
302 0 : if (PQntuples(res) != 1 || PQnfields(res) < 1)
303 : {
304 0 : pg_log_error("could not fetch WAL segment size: got %d rows and %d fields, expected %d rows and %d or more fields",
305 : PQntuples(res), PQnfields(res), 1, 1);
306 :
307 0 : PQclear(res);
308 0 : return false;
309 : }
310 :
311 : /* fetch xlog value and unit from the result */
312 0 : if (sscanf(PQgetvalue(res, 0, 0), "%d%2s", &xlog_val, xlog_unit) != 2)
313 : {
314 0 : pg_log_error("WAL segment size could not be parsed");
315 0 : PQclear(res);
316 0 : return false;
317 : }
318 :
319 0 : PQclear(res);
320 :
321 : /* set the multiplier based on unit to convert xlog_val to bytes */
322 0 : if (strcmp(xlog_unit, "MB") == 0)
323 0 : multiplier = 1024 * 1024;
324 0 : else if (strcmp(xlog_unit, "GB") == 0)
325 0 : multiplier = 1024 * 1024 * 1024;
326 :
327 : /* convert and set WalSegSz */
328 0 : WalSegSz = xlog_val * multiplier;
329 :
330 0 : if (!IsValidWalSegSize(WalSegSz))
331 : {
332 0 : pg_log_error(ngettext("remote server reported invalid WAL segment size (%d byte)",
333 : "remote server reported invalid WAL segment size (%d bytes)",
334 : WalSegSz),
335 : WalSegSz);
336 0 : pg_log_error_detail("The WAL segment size must be a power of two between 1 MB and 1 GB.");
337 0 : return false;
338 : }
339 :
340 0 : return true;
341 0 : }
342 :
343 : /*
344 : * RetrieveDataDirCreatePerm
345 : *
346 : * This function is used to determine the privileges on the server's PG data
347 : * directory and, based on that, set what the permissions will be for
348 : * directories and files we create.
349 : *
350 : * PG11 added support for (optionally) group read/execute rights to be set on
351 : * the data directory. Prior to PG11, only the owner was allowed to have rights
352 : * on the data directory.
353 : */
354 : static bool
355 0 : RetrieveDataDirCreatePerm(PGconn *conn)
356 : {
357 0 : PGresult *res;
358 0 : int data_directory_mode;
359 :
360 : /* check connection existence */
361 0 : Assert(conn != NULL);
362 :
363 : /* for previous versions leave the default group access */
364 0 : if (PQserverVersion(conn) < MINIMUM_VERSION_FOR_GROUP_ACCESS)
365 0 : return true;
366 :
367 0 : res = PQexec(conn, "SHOW data_directory_mode");
368 0 : if (PQresultStatus(res) != PGRES_TUPLES_OK)
369 : {
370 0 : pg_log_error("could not send replication command \"%s\": %s",
371 : "SHOW data_directory_mode", PQerrorMessage(conn));
372 :
373 0 : PQclear(res);
374 0 : return false;
375 : }
376 0 : if (PQntuples(res) != 1 || PQnfields(res) < 1)
377 : {
378 0 : pg_log_error("could not fetch group access flag: got %d rows and %d fields, expected %d rows and %d or more fields",
379 : PQntuples(res), PQnfields(res), 1, 1);
380 :
381 0 : PQclear(res);
382 0 : return false;
383 : }
384 :
385 0 : if (sscanf(PQgetvalue(res, 0, 0), "%o", &data_directory_mode) != 1)
386 : {
387 0 : pg_log_error("group access flag could not be parsed: %s",
388 : PQgetvalue(res, 0, 0));
389 :
390 0 : PQclear(res);
391 0 : return false;
392 : }
393 :
394 0 : SetDataDirectoryCreatePerm(data_directory_mode);
395 :
396 0 : PQclear(res);
397 0 : return true;
398 0 : }
399 :
400 : /*
401 : * Run IDENTIFY_SYSTEM through a given connection and give back to caller
402 : * some result information if requested:
403 : * - System identifier
404 : * - Current timeline ID
405 : * - Start LSN position
406 : * - Database name (NULL in servers prior to 9.4)
407 : */
408 : bool
409 0 : RunIdentifySystem(PGconn *conn, char **sysid, TimeLineID *starttli,
410 : XLogRecPtr *startpos, char **db_name)
411 : {
412 0 : PGresult *res;
413 0 : uint32 hi,
414 : lo;
415 :
416 : /* Check connection existence */
417 0 : Assert(conn != NULL);
418 :
419 0 : res = PQexec(conn, "IDENTIFY_SYSTEM");
420 0 : if (PQresultStatus(res) != PGRES_TUPLES_OK)
421 : {
422 0 : pg_log_error("could not send replication command \"%s\": %s",
423 : "IDENTIFY_SYSTEM", PQerrorMessage(conn));
424 :
425 0 : PQclear(res);
426 0 : return false;
427 : }
428 0 : if (PQntuples(res) != 1 || PQnfields(res) < 3)
429 : {
430 0 : pg_log_error("could not identify system: got %d rows and %d fields, expected %d rows and %d or more fields",
431 : PQntuples(res), PQnfields(res), 1, 3);
432 :
433 0 : PQclear(res);
434 0 : return false;
435 : }
436 :
437 : /* Get system identifier */
438 0 : if (sysid != NULL)
439 0 : *sysid = pg_strdup(PQgetvalue(res, 0, 0));
440 :
441 : /* Get timeline ID to start streaming from */
442 0 : if (starttli != NULL)
443 0 : *starttli = atoi(PQgetvalue(res, 0, 1));
444 :
445 : /* Get LSN start position if necessary */
446 0 : if (startpos != NULL)
447 : {
448 0 : if (sscanf(PQgetvalue(res, 0, 2), "%X/%08X", &hi, &lo) != 2)
449 : {
450 0 : pg_log_error("could not parse write-ahead log location \"%s\"",
451 : PQgetvalue(res, 0, 2));
452 :
453 0 : PQclear(res);
454 0 : return false;
455 : }
456 0 : *startpos = ((uint64) hi) << 32 | lo;
457 0 : }
458 :
459 : /* Get database name, only available in 9.4 and newer versions */
460 0 : if (db_name != NULL)
461 : {
462 0 : *db_name = NULL;
463 0 : if (PQserverVersion(conn) >= 90400)
464 : {
465 0 : if (PQnfields(res) < 4)
466 : {
467 0 : pg_log_error("could not identify system: got %d rows and %d fields, expected %d rows and %d or more fields",
468 : PQntuples(res), PQnfields(res), 1, 4);
469 :
470 0 : PQclear(res);
471 0 : return false;
472 : }
473 0 : if (!PQgetisnull(res, 0, 3))
474 0 : *db_name = pg_strdup(PQgetvalue(res, 0, 3));
475 0 : }
476 0 : }
477 :
478 0 : PQclear(res);
479 0 : return true;
480 0 : }
481 :
482 : /*
483 : * Run READ_REPLICATION_SLOT through a given connection and give back to
484 : * caller some result information if requested for this slot:
485 : * - Start LSN position, InvalidXLogRecPtr if unknown.
486 : * - Current timeline ID, 0 if unknown.
487 : * Returns false on failure, and true otherwise.
488 : */
489 : bool
490 0 : GetSlotInformation(PGconn *conn, const char *slot_name,
491 : XLogRecPtr *restart_lsn, TimeLineID *restart_tli)
492 : {
493 0 : PGresult *res;
494 0 : PQExpBuffer query;
495 0 : XLogRecPtr lsn_loc = InvalidXLogRecPtr;
496 0 : TimeLineID tli_loc = 0;
497 :
498 0 : if (restart_lsn)
499 0 : *restart_lsn = lsn_loc;
500 0 : if (restart_tli)
501 0 : *restart_tli = tli_loc;
502 :
503 0 : query = createPQExpBuffer();
504 0 : appendPQExpBuffer(query, "READ_REPLICATION_SLOT %s", slot_name);
505 0 : res = PQexec(conn, query->data);
506 0 : destroyPQExpBuffer(query);
507 :
508 0 : if (PQresultStatus(res) != PGRES_TUPLES_OK)
509 : {
510 0 : pg_log_error("could not send replication command \"%s\": %s",
511 : "READ_REPLICATION_SLOT", PQerrorMessage(conn));
512 0 : PQclear(res);
513 0 : return false;
514 : }
515 :
516 : /* The command should always return precisely one tuple and three fields */
517 0 : if (PQntuples(res) != 1 || PQnfields(res) != 3)
518 : {
519 0 : pg_log_error("could not read replication slot \"%s\": got %d rows and %d fields, expected %d rows and %d fields",
520 : slot_name, PQntuples(res), PQnfields(res), 1, 3);
521 0 : PQclear(res);
522 0 : return false;
523 : }
524 :
525 : /*
526 : * When the slot doesn't exist, the command returns a tuple with NULL
527 : * values. This checks only the slot type field.
528 : */
529 0 : if (PQgetisnull(res, 0, 0))
530 : {
531 0 : pg_log_error("replication slot \"%s\" does not exist", slot_name);
532 0 : PQclear(res);
533 0 : return false;
534 : }
535 :
536 : /*
537 : * Note that this cannot happen as READ_REPLICATION_SLOT supports only
538 : * physical slots, but play it safe.
539 : */
540 0 : if (strcmp(PQgetvalue(res, 0, 0), "physical") != 0)
541 : {
542 0 : pg_log_error("expected a physical replication slot, got type \"%s\" instead",
543 : PQgetvalue(res, 0, 0));
544 0 : PQclear(res);
545 0 : return false;
546 : }
547 :
548 : /* restart LSN */
549 0 : if (!PQgetisnull(res, 0, 1))
550 : {
551 0 : uint32 hi,
552 : lo;
553 :
554 0 : if (sscanf(PQgetvalue(res, 0, 1), "%X/%08X", &hi, &lo) != 2)
555 : {
556 0 : pg_log_error("could not parse restart_lsn \"%s\" for replication slot \"%s\"",
557 : PQgetvalue(res, 0, 1), slot_name);
558 0 : PQclear(res);
559 0 : return false;
560 : }
561 0 : lsn_loc = ((uint64) hi) << 32 | lo;
562 0 : }
563 :
564 : /* current TLI */
565 0 : if (!PQgetisnull(res, 0, 2))
566 0 : tli_loc = (TimeLineID) atoll(PQgetvalue(res, 0, 2));
567 :
568 0 : PQclear(res);
569 :
570 : /* Assign results if requested */
571 0 : if (restart_lsn)
572 0 : *restart_lsn = lsn_loc;
573 0 : if (restart_tli)
574 0 : *restart_tli = tli_loc;
575 :
576 0 : return true;
577 0 : }
578 :
579 : /*
580 : * Create a replication slot for the given connection. This function
581 : * returns true in case of success.
582 : */
583 : bool
584 0 : CreateReplicationSlot(PGconn *conn, const char *slot_name, const char *plugin,
585 : bool is_temporary, bool is_physical, bool reserve_wal,
586 : bool slot_exists_ok, bool two_phase, bool failover)
587 : {
588 0 : PQExpBuffer query;
589 0 : PGresult *res;
590 0 : bool use_new_option_syntax = (PQserverVersion(conn) >= 150000);
591 :
592 0 : query = createPQExpBuffer();
593 :
594 0 : Assert((is_physical && plugin == NULL) ||
595 : (!is_physical && plugin != NULL));
596 0 : Assert(!(two_phase && is_physical));
597 0 : Assert(!(failover && is_physical));
598 0 : Assert(slot_name != NULL);
599 :
600 : /* Build base portion of query */
601 0 : appendPQExpBuffer(query, "CREATE_REPLICATION_SLOT \"%s\"", slot_name);
602 0 : if (is_temporary)
603 0 : appendPQExpBufferStr(query, " TEMPORARY");
604 0 : if (is_physical)
605 0 : appendPQExpBufferStr(query, " PHYSICAL");
606 : else
607 0 : appendPQExpBuffer(query, " LOGICAL \"%s\"", plugin);
608 :
609 : /* Add any requested options */
610 0 : if (use_new_option_syntax)
611 0 : appendPQExpBufferStr(query, " (");
612 0 : if (is_physical)
613 : {
614 0 : if (reserve_wal)
615 0 : AppendPlainCommandOption(query, use_new_option_syntax,
616 : "RESERVE_WAL");
617 0 : }
618 : else
619 : {
620 0 : if (failover && PQserverVersion(conn) >= 170000)
621 0 : AppendPlainCommandOption(query, use_new_option_syntax,
622 : "FAILOVER");
623 :
624 0 : if (two_phase && PQserverVersion(conn) >= 150000)
625 0 : AppendPlainCommandOption(query, use_new_option_syntax,
626 : "TWO_PHASE");
627 :
628 0 : if (PQserverVersion(conn) >= 100000)
629 : {
630 : /* pg_recvlogical doesn't use an exported snapshot, so suppress */
631 0 : if (use_new_option_syntax)
632 0 : AppendStringCommandOption(query, use_new_option_syntax,
633 : "SNAPSHOT", "nothing");
634 : else
635 0 : AppendPlainCommandOption(query, use_new_option_syntax,
636 : "NOEXPORT_SNAPSHOT");
637 0 : }
638 : }
639 0 : if (use_new_option_syntax)
640 : {
641 : /* Suppress option list if it would be empty, otherwise terminate */
642 0 : if (query->data[query->len - 1] == '(')
643 : {
644 0 : query->len -= 2;
645 0 : query->data[query->len] = '\0';
646 0 : }
647 : else
648 0 : appendPQExpBufferChar(query, ')');
649 0 : }
650 :
651 : /* Now run the query */
652 0 : res = PQexec(conn, query->data);
653 0 : if (PQresultStatus(res) != PGRES_TUPLES_OK)
654 : {
655 0 : const char *sqlstate = PQresultErrorField(res, PG_DIAG_SQLSTATE);
656 :
657 0 : if (slot_exists_ok &&
658 0 : sqlstate &&
659 0 : strcmp(sqlstate, ERRCODE_DUPLICATE_OBJECT) == 0)
660 : {
661 0 : destroyPQExpBuffer(query);
662 0 : PQclear(res);
663 0 : return true;
664 : }
665 : else
666 : {
667 0 : pg_log_error("could not send replication command \"%s\": %s",
668 : query->data, PQerrorMessage(conn));
669 :
670 0 : destroyPQExpBuffer(query);
671 0 : PQclear(res);
672 0 : return false;
673 : }
674 0 : }
675 :
676 0 : if (PQntuples(res) != 1 || PQnfields(res) != 4)
677 : {
678 0 : pg_log_error("could not create replication slot \"%s\": got %d rows and %d fields, expected %d rows and %d fields",
679 : slot_name,
680 : PQntuples(res), PQnfields(res), 1, 4);
681 :
682 0 : destroyPQExpBuffer(query);
683 0 : PQclear(res);
684 0 : return false;
685 : }
686 :
687 0 : destroyPQExpBuffer(query);
688 0 : PQclear(res);
689 0 : return true;
690 0 : }
691 :
692 : /*
693 : * Drop a replication slot for the given connection. This function
694 : * returns true in case of success.
695 : */
696 : bool
697 0 : DropReplicationSlot(PGconn *conn, const char *slot_name)
698 : {
699 0 : PQExpBuffer query;
700 0 : PGresult *res;
701 :
702 0 : Assert(slot_name != NULL);
703 :
704 0 : query = createPQExpBuffer();
705 :
706 : /* Build query */
707 0 : appendPQExpBuffer(query, "DROP_REPLICATION_SLOT \"%s\"",
708 0 : slot_name);
709 0 : res = PQexec(conn, query->data);
710 0 : if (PQresultStatus(res) != PGRES_COMMAND_OK)
711 : {
712 0 : pg_log_error("could not send replication command \"%s\": %s",
713 : query->data, PQerrorMessage(conn));
714 :
715 0 : destroyPQExpBuffer(query);
716 0 : PQclear(res);
717 0 : return false;
718 : }
719 :
720 0 : if (PQntuples(res) != 0 || PQnfields(res) != 0)
721 : {
722 0 : pg_log_error("could not drop replication slot \"%s\": got %d rows and %d fields, expected %d rows and %d fields",
723 : slot_name,
724 : PQntuples(res), PQnfields(res), 0, 0);
725 :
726 0 : destroyPQExpBuffer(query);
727 0 : PQclear(res);
728 0 : return false;
729 : }
730 :
731 0 : destroyPQExpBuffer(query);
732 0 : PQclear(res);
733 0 : return true;
734 0 : }
735 :
736 : /*
737 : * Append a "plain" option - one with no value - to a server command that
738 : * is being constructed.
739 : *
740 : * In the old syntax, all options were parser keywords, so you could just
741 : * write things like SOME_COMMAND OPTION1 OPTION2 'opt2value' OPTION3 42. The
742 : * new syntax uses a comma-separated list surrounded by parentheses, so the
743 : * equivalent is SOME_COMMAND (OPTION1, OPTION2 'optvalue', OPTION3 42).
744 : */
745 : void
746 0 : AppendPlainCommandOption(PQExpBuffer buf, bool use_new_option_syntax,
747 : char *option_name)
748 : {
749 0 : if (buf->len > 0 && buf->data[buf->len - 1] != '(')
750 : {
751 0 : if (use_new_option_syntax)
752 0 : appendPQExpBufferStr(buf, ", ");
753 : else
754 0 : appendPQExpBufferChar(buf, ' ');
755 0 : }
756 :
757 0 : appendPQExpBuffer(buf, " %s", option_name);
758 0 : }
759 :
760 : /*
761 : * Append an option with an associated string value to a server command that
762 : * is being constructed.
763 : *
764 : * See comments for AppendPlainCommandOption, above.
765 : */
766 : void
767 0 : AppendStringCommandOption(PQExpBuffer buf, bool use_new_option_syntax,
768 : char *option_name, char *option_value)
769 : {
770 0 : AppendPlainCommandOption(buf, use_new_option_syntax, option_name);
771 :
772 0 : if (option_value != NULL)
773 : {
774 0 : size_t length = strlen(option_value);
775 0 : char *escaped_value = palloc(1 + 2 * length);
776 :
777 0 : PQescapeStringConn(conn, escaped_value, option_value, length, NULL);
778 0 : appendPQExpBuffer(buf, " '%s'", escaped_value);
779 0 : pfree(escaped_value);
780 0 : }
781 0 : }
782 :
783 : /*
784 : * Append an option with an associated integer value to a server command
785 : * is being constructed.
786 : *
787 : * See comments for AppendPlainCommandOption, above.
788 : */
789 : void
790 0 : AppendIntegerCommandOption(PQExpBuffer buf, bool use_new_option_syntax,
791 : char *option_name, int32 option_value)
792 : {
793 0 : AppendPlainCommandOption(buf, use_new_option_syntax, option_name);
794 :
795 0 : appendPQExpBuffer(buf, " %d", option_value);
796 0 : }
797 :
798 : /*
799 : * Frontend version of GetCurrentTimestamp(), since we are not linked with
800 : * backend code.
801 : */
802 : TimestampTz
803 0 : feGetCurrentTimestamp(void)
804 : {
805 0 : TimestampTz result;
806 0 : struct timeval tp;
807 :
808 0 : gettimeofday(&tp, NULL);
809 :
810 0 : result = (TimestampTz) tp.tv_sec -
811 : ((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY);
812 0 : result = (result * USECS_PER_SEC) + tp.tv_usec;
813 :
814 0 : return result;
815 0 : }
816 :
817 : /*
818 : * Frontend version of TimestampDifference(), since we are not linked with
819 : * backend code.
820 : */
821 : void
822 0 : feTimestampDifference(TimestampTz start_time, TimestampTz stop_time,
823 : long *secs, int *microsecs)
824 : {
825 0 : TimestampTz diff = stop_time - start_time;
826 :
827 0 : if (diff <= 0)
828 : {
829 0 : *secs = 0;
830 0 : *microsecs = 0;
831 0 : }
832 : else
833 : {
834 0 : *secs = (long) (diff / USECS_PER_SEC);
835 0 : *microsecs = (int) (diff % USECS_PER_SEC);
836 : }
837 0 : }
838 :
839 : /*
840 : * Frontend version of TimestampDifferenceExceeds(), since we are not
841 : * linked with backend code.
842 : */
843 : bool
844 0 : feTimestampDifferenceExceeds(TimestampTz start_time,
845 : TimestampTz stop_time,
846 : int msec)
847 : {
848 0 : TimestampTz diff = stop_time - start_time;
849 :
850 0 : return (diff >= msec * INT64CONST(1000));
851 0 : }
852 :
853 : /*
854 : * Converts an int64 to network byte order.
855 : */
856 : void
857 0 : fe_sendint64(int64 i, char *buf)
858 : {
859 0 : uint64 n64 = pg_hton64(i);
860 :
861 0 : memcpy(buf, &n64, sizeof(n64));
862 0 : }
863 :
864 : /*
865 : * Converts an int64 from network byte order to native format.
866 : */
867 : int64
868 0 : fe_recvint64(char *buf)
869 : {
870 0 : uint64 n64;
871 :
872 0 : memcpy(&n64, buf, sizeof(n64));
873 :
874 0 : return pg_ntoh64(n64);
875 0 : }
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