/*
* int2send - converts int2 to binary format
*/
Datum
int2send(PG_FUNCTION_ARGS)
{
int16 arg1 = PG_GETARG_INT16(0);
StringInfoData buf;
pq_begintypsend(&buf);
pq_sendint16(&buf, arg1);
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*
* tidsend - converts tid to binary format
*/
Datum
tidsend(PG_FUNCTION_ARGS)
{
ItemPointer itemPtr = PG_GETARG_ITEMPOINTER(0);
StringInfoData buf;
pq_begintypsend(&buf);
pq_sendint32(&buf, ItemPointerGetBlockNumberNoCheck(itemPtr));
pq_sendint16(&buf, ItemPointerGetOffsetNumberNoCheck(itemPtr));
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*
* SendRowDescriptionMessage --- send a RowDescription message to the frontend
*
* Notes: the TupleDesc has typically been manufactured by ExecTypeFromTL()
* or some similar function; it does not contain a full set of fields.
* The targetlist will be NIL when executing a utility function that does
* not have a plan. If the targetlist isn't NIL then it is a Query node's
* targetlist; it is up to us to ignore resjunk columns in it. The formats[]
* array pointer might be NULL (if we are doing Describe on a prepared stmt);
* send zeroes for the format codes in that case.
*/
void
SendRowDescriptionMessage(StringInfo buf, TupleDesc typeinfo,
List *targetlist, int16 *formats)
{
int natts = typeinfo->natts;
int proto = PG_PROTOCOL_MAJOR(FrontendProtocol);
/* tuple descriptor message type */
pq_beginmessage_reuse(buf, 'T');
/* # of attrs in tuples */
pq_sendint16(buf, natts);
if (proto >= 3)
SendRowDescriptionCols_3(buf, typeinfo, targetlist, formats);
else
SendRowDescriptionCols_2(buf, typeinfo, targetlist, formats);
pq_endmessage_reuse(buf);
}
/*
* Send description for each column when using v2 protocol
*/
static void
SendRowDescriptionCols_2(StringInfo buf, TupleDesc typeinfo, List *targetlist, int16 *formats)
{
int natts = typeinfo->natts;
int i;
for (i = 0; i < natts; ++i)
{
Form_pg_attribute att = TupleDescAttr(typeinfo, i);
Oid atttypid = att->atttypid;
int32 atttypmod = att->atttypmod;
/* If column is a domain, send the base type and typmod instead */
atttypid = getBaseTypeAndTypmod(atttypid, &atttypmod);
pq_sendstring(buf, NameStr(att->attname));
/* column ID only info appears in protocol 3.0 and up */
pq_sendint32(buf, atttypid);
pq_sendint16(buf, att->attlen);
pq_sendint32(buf, atttypmod);
/* format info only appears in protocol 3.0 and up */
}
}
/* ----------------
* printtup --- print a tuple in protocol 3.0
* ----------------
*/
static bool
printtup(TupleTableSlot *slot, DestReceiver *self)
{
TupleDesc typeinfo = slot->tts_tupleDescriptor;
DR_printtup *myState = (DR_printtup *) self;
MemoryContext oldcontext;
StringInfo buf = &myState->buf;
int natts = typeinfo->natts;
int i;
/* Set or update my derived attribute info, if needed */
if (myState->attrinfo != typeinfo || myState->nattrs != natts)
printtup_prepare_info(myState, typeinfo, natts);
/* Make sure the tuple is fully deconstructed */
slot_getallattrs(slot);
/* Switch into per-row context so we can recover memory below */
oldcontext = MemoryContextSwitchTo(myState->tmpcontext);
/*
* Prepare a DataRow message (note buffer is in per-row context)
*/
pq_beginmessage_reuse(buf, 'D');
pq_sendint16(buf, natts);
/*
* send the attributes of this tuple
*/
for (i = 0; i < natts; ++i)
{
PrinttupAttrInfo *thisState = myState->myinfo + i;
Datum attr = slot->tts_values[i];
if (slot->tts_isnull[i])
{
pq_sendint32(buf, -1);
continue;
}
/*
* Here we catch undefined bytes in datums that are returned to the
* client without hitting disk; see comments at the related check in
* PageAddItem(). This test is most useful for uncompressed,
* non-external datums, but we're quite likely to see such here when
* testing new C functions.
*/
if (thisState->typisvarlena)
VALGRIND_CHECK_MEM_IS_DEFINED(DatumGetPointer(attr),
VARSIZE_ANY(attr));
if (thisState->format == 0)
{
/* Text output */
char *outputstr;
outputstr = OutputFunctionCall(&thisState->finfo, attr);
pq_sendcountedtext(buf, outputstr, strlen(outputstr), false);
}
else
{
/* Binary output */
bytea *outputbytes;
outputbytes = SendFunctionCall(&thisState->finfo, attr);
pq_sendint32(buf, VARSIZE(outputbytes) - VARHDRSZ);
pq_sendbytes(buf, VARDATA(outputbytes),
VARSIZE(outputbytes) - VARHDRSZ);
}
}
pq_endmessage_reuse(buf);
/* Return to caller's context, and flush row's temporary memory */
MemoryContextSwitchTo(oldcontext);
MemoryContextReset(myState->tmpcontext);
return true;
}
/*
* Actually do a base backup for the specified tablespaces.
*
* This is split out mainly to avoid complaints about "variable might be
* clobbered by longjmp" from stupider versions of gcc.
*/
static void
perform_base_backup(basebackup_options *opt)
{
TimeLineID starttli;
XLogRecPtr endptr;
TimeLineID endtli;
StringInfo labelfile;
StringInfo tblspc_map_file = NULL;
int datadirpathlen;
List *tablespaces = NIL;
datadirpathlen = strlen(DataDir);
backup_started_in_recovery = RecoveryInProgress();
labelfile = makeStringInfo();
tblspc_map_file = makeStringInfo();
total_checksum_failures = 0;
startptr = do_pg_start_backup(opt->label, opt->fastcheckpoint, &starttli,
labelfile, &tablespaces,
tblspc_map_file,
opt->progress, opt->sendtblspcmapfile);
/*
* Once do_pg_start_backup has been called, ensure that any failure causes
* us to abort the backup so we don't "leak" a backup counter. For this
* reason, *all* functionality between do_pg_start_backup() and
* the end of do_pg_stop_backup() should be inside the error cleanup block!
*/
PG_ENSURE_ERROR_CLEANUP(base_backup_cleanup, (Datum) 0);
{
ListCell *lc;
tablespaceinfo *ti;
SendXlogRecPtrResult(startptr, starttli);
/*
* Calculate the relative path of temporary statistics directory in
* order to skip the files which are located in that directory later.
*/
if (is_absolute_path(pgstat_stat_directory) &&
strncmp(pgstat_stat_directory, DataDir, datadirpathlen) == 0)
statrelpath = psprintf("./%s", pgstat_stat_directory + datadirpathlen + 1);
else if (strncmp(pgstat_stat_directory, "./", 2) != 0)
statrelpath = psprintf("./%s", pgstat_stat_directory);
else
statrelpath = pgstat_stat_directory;
/* Add a node for the base directory at the end */
ti = palloc0(sizeof(tablespaceinfo));
ti->size = opt->progress ? sendDir(".", 1, true, tablespaces, true) : -1;
tablespaces = lappend(tablespaces, ti);
/* Send tablespace header */
SendBackupHeader(tablespaces);
/* Setup and activate network throttling, if client requested it */
if (opt->maxrate > 0)
{
throttling_sample =
(int64) opt->maxrate * (int64) 1024 / THROTTLING_FREQUENCY;
/*
* The minimum amount of time for throttling_sample bytes to be
* transferred.
*/
elapsed_min_unit = USECS_PER_SEC / THROTTLING_FREQUENCY;
/* Enable throttling. */
throttling_counter = 0;
/* The 'real data' starts now (header was ignored). */
throttled_last = GetCurrentTimestamp();
}
else
{
/* Disable throttling. */
throttling_counter = -1;
}
/* Send off our tablespaces one by one */
foreach(lc, tablespaces)
{
tablespaceinfo *ti = (tablespaceinfo *) lfirst(lc);
StringInfoData buf;
/* Send CopyOutResponse message */
pq_beginmessage(&buf, 'H');
pq_sendbyte(&buf, 0); /* overall format */
pq_sendint16(&buf, 0); /* natts */
pq_endmessage(&buf);
if (ti->path == NULL)
{
struct stat statbuf;
/* In the main tar, include the backup_label first... */
sendFileWithContent(BACKUP_LABEL_FILE, labelfile->data);
/*
* Send tablespace_map file if required and then the bulk of
* the files.
*/
if (tblspc_map_file && opt->sendtblspcmapfile)
{
sendFileWithContent(TABLESPACE_MAP, tblspc_map_file->data);
sendDir(".", 1, false, tablespaces, false);
}
else
sendDir(".", 1, false, tablespaces, true);
/* ... and pg_control after everything else. */
if (lstat(XLOG_CONTROL_FILE, &statbuf) != 0)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not stat control file \"%s\": %m",
XLOG_CONTROL_FILE)));
sendFile(XLOG_CONTROL_FILE, XLOG_CONTROL_FILE, &statbuf, false);
}
else
sendTablespace(ti->path, false);
/*
* If we're including WAL, and this is the main data directory we
* don't terminate the tar stream here. Instead, we will append
* the xlog files below and terminate it then. This is safe since
* the main data directory is always sent *last*.
*/
if (opt->includewal && ti->path == NULL)
{
Assert(lnext(lc) == NULL);
}
else
pq_putemptymessage('c'); /* CopyDone */
}
endptr = do_pg_stop_backup(labelfile->data, !opt->nowait, &endtli);
}