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printtup.c
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1 /*-------------------------------------------------------------------------
2  *
3  * printtup.c
4  * Routines to print out tuples to the destination (both frontend
5  * clients and standalone backends are supported here).
6  *
7  *
8  * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
9  * Portions Copyright (c) 1994, Regents of the University of California
10  *
11  * IDENTIFICATION
12  * src/backend/access/common/printtup.c
13  *
14  *-------------------------------------------------------------------------
15  */
16 #include "postgres.h"
17 
18 #include "access/printtup.h"
19 #include "libpq/libpq.h"
20 #include "libpq/pqformat.h"
21 #include "tcop/pquery.h"
22 #include "utils/lsyscache.h"
23 #include "utils/memdebug.h"
24 #include "utils/memutils.h"
25 
26 
27 static void printtup_startup(DestReceiver *self, int operation,
28  TupleDesc typeinfo);
29 static bool printtup(TupleTableSlot *slot, DestReceiver *self);
30 static bool printtup_20(TupleTableSlot *slot, DestReceiver *self);
31 static bool printtup_internal_20(TupleTableSlot *slot, DestReceiver *self);
32 static void printtup_shutdown(DestReceiver *self);
33 static void printtup_destroy(DestReceiver *self);
34 
35 
36 /* ----------------------------------------------------------------
37  * printtup / debugtup support
38  * ----------------------------------------------------------------
39  */
40 
41 /* ----------------
42  * Private state for a printtup destination object
43  *
44  * NOTE: finfo is the lookup info for either typoutput or typsend, whichever
45  * we are using for this column.
46  * ----------------
47  */
48 typedef struct
49 { /* Per-attribute information */
50  Oid typoutput; /* Oid for the type's text output fn */
51  Oid typsend; /* Oid for the type's binary output fn */
52  bool typisvarlena; /* is it varlena (ie possibly toastable)? */
53  int16 format; /* format code for this column */
54  FmgrInfo finfo; /* Precomputed call info for output fn */
56 
57 typedef struct
58 {
59  DestReceiver pub; /* publicly-known function pointers */
60  Portal portal; /* the Portal we are printing from */
61  bool sendDescrip; /* send RowDescription at startup? */
62  TupleDesc attrinfo; /* The attr info we are set up for */
63  int nattrs;
64  PrinttupAttrInfo *myinfo; /* Cached info about each attr */
65  MemoryContext tmpcontext; /* Memory context for per-row workspace */
66 } DR_printtup;
67 
68 /* ----------------
69  * Initialize: create a DestReceiver for printtup
70  * ----------------
71  */
74 {
75  DR_printtup *self = (DR_printtup *) palloc0(sizeof(DR_printtup));
76 
77  self->pub.receiveSlot = printtup; /* might get changed later */
78  self->pub.rStartup = printtup_startup;
79  self->pub.rShutdown = printtup_shutdown;
80  self->pub.rDestroy = printtup_destroy;
81  self->pub.mydest = dest;
82 
83  /*
84  * Send T message automatically if DestRemote, but not if
85  * DestRemoteExecute
86  */
87  self->sendDescrip = (dest == DestRemote);
88 
89  self->attrinfo = NULL;
90  self->nattrs = 0;
91  self->myinfo = NULL;
92  self->tmpcontext = NULL;
93 
94  return (DestReceiver *) self;
95 }
96 
97 /*
98  * Set parameters for a DestRemote (or DestRemoteExecute) receiver
99  */
100 void
102 {
103  DR_printtup *myState = (DR_printtup *) self;
104 
105  Assert(myState->pub.mydest == DestRemote ||
106  myState->pub.mydest == DestRemoteExecute);
107 
108  myState->portal = portal;
109 
111  {
112  /*
113  * In protocol 2.0 the Bind message does not exist, so there is no way
114  * for the columns to have different print formats; it's sufficient to
115  * look at the first one.
116  */
117  if (portal->formats && portal->formats[0] != 0)
119  else
120  myState->pub.receiveSlot = printtup_20;
121  }
122 }
123 
124 static void
125 printtup_startup(DestReceiver *self, int operation, TupleDesc typeinfo)
126 {
127  DR_printtup *myState = (DR_printtup *) self;
128  Portal portal = myState->portal;
129 
130  /*
131  * Create a temporary memory context that we can reset once per row to
132  * recover palloc'd memory. This avoids any problems with leaks inside
133  * datatype output routines, and should be faster than retail pfree's
134  * anyway.
135  */
137  "printtup",
139 
141  {
142  /*
143  * Send portal name to frontend (obsolete cruft, gone in proto 3.0)
144  *
145  * If portal name not specified, use "blank" portal.
146  */
147  const char *portalName = portal->name;
148 
149  if (portalName == NULL || portalName[0] == '\0')
150  portalName = "blank";
151 
152  pq_puttextmessage('P', portalName);
153  }
154 
155  /*
156  * If we are supposed to emit row descriptions, then send the tuple
157  * descriptor of the tuples.
158  */
159  if (myState->sendDescrip)
160  SendRowDescriptionMessage(typeinfo,
161  FetchPortalTargetList(portal),
162  portal->formats);
163 
164  /* ----------------
165  * We could set up the derived attr info at this time, but we postpone it
166  * until the first call of printtup, for 2 reasons:
167  * 1. We don't waste time (compared to the old way) if there are no
168  * tuples at all to output.
169  * 2. Checking in printtup allows us to handle the case that the tuples
170  * change type midway through (although this probably can't happen in
171  * the current executor).
172  * ----------------
173  */
174 }
175 
176 /*
177  * SendRowDescriptionMessage --- send a RowDescription message to the frontend
178  *
179  * Notes: the TupleDesc has typically been manufactured by ExecTypeFromTL()
180  * or some similar function; it does not contain a full set of fields.
181  * The targetlist will be NIL when executing a utility function that does
182  * not have a plan. If the targetlist isn't NIL then it is a Query node's
183  * targetlist; it is up to us to ignore resjunk columns in it. The formats[]
184  * array pointer might be NULL (if we are doing Describe on a prepared stmt);
185  * send zeroes for the format codes in that case.
186  */
187 void
188 SendRowDescriptionMessage(TupleDesc typeinfo, List *targetlist, int16 *formats)
189 {
190  Form_pg_attribute *attrs = typeinfo->attrs;
191  int natts = typeinfo->natts;
192  int proto = PG_PROTOCOL_MAJOR(FrontendProtocol);
193  int i;
195  ListCell *tlist_item = list_head(targetlist);
196 
197  pq_beginmessage(&buf, 'T'); /* tuple descriptor message type */
198  pq_sendint(&buf, natts, 2); /* # of attrs in tuples */
199 
200  for (i = 0; i < natts; ++i)
201  {
202  Oid atttypid = attrs[i]->atttypid;
203  int32 atttypmod = attrs[i]->atttypmod;
204 
205  pq_sendstring(&buf, NameStr(attrs[i]->attname));
206  /* column ID info appears in protocol 3.0 and up */
207  if (proto >= 3)
208  {
209  /* Do we have a non-resjunk tlist item? */
210  while (tlist_item &&
211  ((TargetEntry *) lfirst(tlist_item))->resjunk)
212  tlist_item = lnext(tlist_item);
213  if (tlist_item)
214  {
215  TargetEntry *tle = (TargetEntry *) lfirst(tlist_item);
216 
217  pq_sendint(&buf, tle->resorigtbl, 4);
218  pq_sendint(&buf, tle->resorigcol, 2);
219  tlist_item = lnext(tlist_item);
220  }
221  else
222  {
223  /* No info available, so send zeroes */
224  pq_sendint(&buf, 0, 4);
225  pq_sendint(&buf, 0, 2);
226  }
227  }
228  /* If column is a domain, send the base type and typmod instead */
229  atttypid = getBaseTypeAndTypmod(atttypid, &atttypmod);
230  pq_sendint(&buf, (int) atttypid, sizeof(atttypid));
231  pq_sendint(&buf, attrs[i]->attlen, sizeof(attrs[i]->attlen));
232  pq_sendint(&buf, atttypmod, sizeof(atttypmod));
233  /* format info appears in protocol 3.0 and up */
234  if (proto >= 3)
235  {
236  if (formats)
237  pq_sendint(&buf, formats[i], 2);
238  else
239  pq_sendint(&buf, 0, 2);
240  }
241  }
242  pq_endmessage(&buf);
243 }
244 
245 /*
246  * Get the lookup info that printtup() needs
247  */
248 static void
249 printtup_prepare_info(DR_printtup *myState, TupleDesc typeinfo, int numAttrs)
250 {
251  int16 *formats = myState->portal->formats;
252  int i;
253 
254  /* get rid of any old data */
255  if (myState->myinfo)
256  pfree(myState->myinfo);
257  myState->myinfo = NULL;
258 
259  myState->attrinfo = typeinfo;
260  myState->nattrs = numAttrs;
261  if (numAttrs <= 0)
262  return;
263 
264  myState->myinfo = (PrinttupAttrInfo *)
265  palloc0(numAttrs * sizeof(PrinttupAttrInfo));
266 
267  for (i = 0; i < numAttrs; i++)
268  {
269  PrinttupAttrInfo *thisState = myState->myinfo + i;
270  int16 format = (formats ? formats[i] : 0);
271 
272  thisState->format = format;
273  if (format == 0)
274  {
275  getTypeOutputInfo(typeinfo->attrs[i]->atttypid,
276  &thisState->typoutput,
277  &thisState->typisvarlena);
278  fmgr_info(thisState->typoutput, &thisState->finfo);
279  }
280  else if (format == 1)
281  {
282  getTypeBinaryOutputInfo(typeinfo->attrs[i]->atttypid,
283  &thisState->typsend,
284  &thisState->typisvarlena);
285  fmgr_info(thisState->typsend, &thisState->finfo);
286  }
287  else
288  ereport(ERROR,
289  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
290  errmsg("unsupported format code: %d", format)));
291  }
292 }
293 
294 /* ----------------
295  * printtup --- print a tuple in protocol 3.0
296  * ----------------
297  */
298 static bool
300 {
301  TupleDesc typeinfo = slot->tts_tupleDescriptor;
302  DR_printtup *myState = (DR_printtup *) self;
303  MemoryContext oldcontext;
305  int natts = typeinfo->natts;
306  int i;
307 
308  /* Set or update my derived attribute info, if needed */
309  if (myState->attrinfo != typeinfo || myState->nattrs != natts)
310  printtup_prepare_info(myState, typeinfo, natts);
311 
312  /* Make sure the tuple is fully deconstructed */
313  slot_getallattrs(slot);
314 
315  /* Switch into per-row context so we can recover memory below */
316  oldcontext = MemoryContextSwitchTo(myState->tmpcontext);
317 
318  /*
319  * Prepare a DataRow message (note buffer is in per-row context)
320  */
321  pq_beginmessage(&buf, 'D');
322 
323  pq_sendint(&buf, natts, 2);
324 
325  /*
326  * send the attributes of this tuple
327  */
328  for (i = 0; i < natts; ++i)
329  {
330  PrinttupAttrInfo *thisState = myState->myinfo + i;
331  Datum attr = slot->tts_values[i];
332 
333  if (slot->tts_isnull[i])
334  {
335  pq_sendint(&buf, -1, 4);
336  continue;
337  }
338 
339  /*
340  * Here we catch undefined bytes in datums that are returned to the
341  * client without hitting disk; see comments at the related check in
342  * PageAddItem(). This test is most useful for uncompressed,
343  * non-external datums, but we're quite likely to see such here when
344  * testing new C functions.
345  */
346  if (thisState->typisvarlena)
348  VARSIZE_ANY(attr));
349 
350  if (thisState->format == 0)
351  {
352  /* Text output */
353  char *outputstr;
354 
355  outputstr = OutputFunctionCall(&thisState->finfo, attr);
356  pq_sendcountedtext(&buf, outputstr, strlen(outputstr), false);
357  }
358  else
359  {
360  /* Binary output */
361  bytea *outputbytes;
362 
363  outputbytes = SendFunctionCall(&thisState->finfo, attr);
364  pq_sendint(&buf, VARSIZE(outputbytes) - VARHDRSZ, 4);
365  pq_sendbytes(&buf, VARDATA(outputbytes),
366  VARSIZE(outputbytes) - VARHDRSZ);
367  }
368  }
369 
370  pq_endmessage(&buf);
371 
372  /* Return to caller's context, and flush row's temporary memory */
373  MemoryContextSwitchTo(oldcontext);
374  MemoryContextReset(myState->tmpcontext);
375 
376  return true;
377 }
378 
379 /* ----------------
380  * printtup_20 --- print a tuple in protocol 2.0
381  * ----------------
382  */
383 static bool
385 {
386  TupleDesc typeinfo = slot->tts_tupleDescriptor;
387  DR_printtup *myState = (DR_printtup *) self;
388  MemoryContext oldcontext;
390  int natts = typeinfo->natts;
391  int i,
392  j,
393  k;
394 
395  /* Set or update my derived attribute info, if needed */
396  if (myState->attrinfo != typeinfo || myState->nattrs != natts)
397  printtup_prepare_info(myState, typeinfo, natts);
398 
399  /* Make sure the tuple is fully deconstructed */
400  slot_getallattrs(slot);
401 
402  /* Switch into per-row context so we can recover memory below */
403  oldcontext = MemoryContextSwitchTo(myState->tmpcontext);
404 
405  /*
406  * tell the frontend to expect new tuple data (in ASCII style)
407  */
408  pq_beginmessage(&buf, 'D');
409 
410  /*
411  * send a bitmap of which attributes are not null
412  */
413  j = 0;
414  k = 1 << 7;
415  for (i = 0; i < natts; ++i)
416  {
417  if (!slot->tts_isnull[i])
418  j |= k; /* set bit if not null */
419  k >>= 1;
420  if (k == 0) /* end of byte? */
421  {
422  pq_sendint(&buf, j, 1);
423  j = 0;
424  k = 1 << 7;
425  }
426  }
427  if (k != (1 << 7)) /* flush last partial byte */
428  pq_sendint(&buf, j, 1);
429 
430  /*
431  * send the attributes of this tuple
432  */
433  for (i = 0; i < natts; ++i)
434  {
435  PrinttupAttrInfo *thisState = myState->myinfo + i;
436  Datum attr = slot->tts_values[i];
437  char *outputstr;
438 
439  if (slot->tts_isnull[i])
440  continue;
441 
442  Assert(thisState->format == 0);
443 
444  outputstr = OutputFunctionCall(&thisState->finfo, attr);
445  pq_sendcountedtext(&buf, outputstr, strlen(outputstr), true);
446  }
447 
448  pq_endmessage(&buf);
449 
450  /* Return to caller's context, and flush row's temporary memory */
451  MemoryContextSwitchTo(oldcontext);
452  MemoryContextReset(myState->tmpcontext);
453 
454  return true;
455 }
456 
457 /* ----------------
458  * printtup_shutdown
459  * ----------------
460  */
461 static void
463 {
464  DR_printtup *myState = (DR_printtup *) self;
465 
466  if (myState->myinfo)
467  pfree(myState->myinfo);
468  myState->myinfo = NULL;
469 
470  myState->attrinfo = NULL;
471 
472  if (myState->tmpcontext)
474  myState->tmpcontext = NULL;
475 }
476 
477 /* ----------------
478  * printtup_destroy
479  * ----------------
480  */
481 static void
483 {
484  pfree(self);
485 }
486 
487 /* ----------------
488  * printatt
489  * ----------------
490  */
491 static void
492 printatt(unsigned attributeId,
493  Form_pg_attribute attributeP,
494  char *value)
495 {
496  printf("\t%2d: %s%s%s%s\t(typeid = %u, len = %d, typmod = %d, byval = %c)\n",
497  attributeId,
498  NameStr(attributeP->attname),
499  value != NULL ? " = \"" : "",
500  value != NULL ? value : "",
501  value != NULL ? "\"" : "",
502  (unsigned int) (attributeP->atttypid),
503  attributeP->attlen,
504  attributeP->atttypmod,
505  attributeP->attbyval ? 't' : 'f');
506 }
507 
508 /* ----------------
509  * debugStartup - prepare to print tuples for an interactive backend
510  * ----------------
511  */
512 void
513 debugStartup(DestReceiver *self, int operation, TupleDesc typeinfo)
514 {
515  int natts = typeinfo->natts;
516  Form_pg_attribute *attinfo = typeinfo->attrs;
517  int i;
518 
519  /*
520  * show the return type of the tuples
521  */
522  for (i = 0; i < natts; ++i)
523  printatt((unsigned) i + 1, attinfo[i], NULL);
524  printf("\t----\n");
525 }
526 
527 /* ----------------
528  * debugtup - print one tuple for an interactive backend
529  * ----------------
530  */
531 bool
533 {
534  TupleDesc typeinfo = slot->tts_tupleDescriptor;
535  int natts = typeinfo->natts;
536  int i;
537  Datum attr;
538  char *value;
539  bool isnull;
540  Oid typoutput;
541  bool typisvarlena;
542 
543  for (i = 0; i < natts; ++i)
544  {
545  attr = slot_getattr(slot, i + 1, &isnull);
546  if (isnull)
547  continue;
548  getTypeOutputInfo(typeinfo->attrs[i]->atttypid,
549  &typoutput, &typisvarlena);
550 
551  value = OidOutputFunctionCall(typoutput, attr);
552 
553  printatt((unsigned) i + 1, typeinfo->attrs[i], value);
554  }
555  printf("\t----\n");
556 
557  return true;
558 }
559 
560 /* ----------------
561  * printtup_internal_20 --- print a binary tuple in protocol 2.0
562  *
563  * We use a different message type, i.e. 'B' instead of 'D' to
564  * indicate a tuple in internal (binary) form.
565  *
566  * This is largely same as printtup_20, except we use binary formatting.
567  * ----------------
568  */
569 static bool
571 {
572  TupleDesc typeinfo = slot->tts_tupleDescriptor;
573  DR_printtup *myState = (DR_printtup *) self;
574  MemoryContext oldcontext;
576  int natts = typeinfo->natts;
577  int i,
578  j,
579  k;
580 
581  /* Set or update my derived attribute info, if needed */
582  if (myState->attrinfo != typeinfo || myState->nattrs != natts)
583  printtup_prepare_info(myState, typeinfo, natts);
584 
585  /* Make sure the tuple is fully deconstructed */
586  slot_getallattrs(slot);
587 
588  /* Switch into per-row context so we can recover memory below */
589  oldcontext = MemoryContextSwitchTo(myState->tmpcontext);
590 
591  /*
592  * tell the frontend to expect new tuple data (in binary style)
593  */
594  pq_beginmessage(&buf, 'B');
595 
596  /*
597  * send a bitmap of which attributes are not null
598  */
599  j = 0;
600  k = 1 << 7;
601  for (i = 0; i < natts; ++i)
602  {
603  if (!slot->tts_isnull[i])
604  j |= k; /* set bit if not null */
605  k >>= 1;
606  if (k == 0) /* end of byte? */
607  {
608  pq_sendint(&buf, j, 1);
609  j = 0;
610  k = 1 << 7;
611  }
612  }
613  if (k != (1 << 7)) /* flush last partial byte */
614  pq_sendint(&buf, j, 1);
615 
616  /*
617  * send the attributes of this tuple
618  */
619  for (i = 0; i < natts; ++i)
620  {
621  PrinttupAttrInfo *thisState = myState->myinfo + i;
622  Datum attr = slot->tts_values[i];
623  bytea *outputbytes;
624 
625  if (slot->tts_isnull[i])
626  continue;
627 
628  Assert(thisState->format == 1);
629 
630  outputbytes = SendFunctionCall(&thisState->finfo, attr);
631  pq_sendint(&buf, VARSIZE(outputbytes) - VARHDRSZ, 4);
632  pq_sendbytes(&buf, VARDATA(outputbytes),
633  VARSIZE(outputbytes) - VARHDRSZ);
634  }
635 
636  pq_endmessage(&buf);
637 
638  /* Return to caller's context, and flush row's temporary memory */
639  MemoryContextSwitchTo(oldcontext);
640  MemoryContextReset(myState->tmpcontext);
641 
642  return true;
643 }
signed short int16
Definition: c.h:255
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FormData_pg_attribute * Form_pg_attribute
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Definition: aset.c:322
void * palloc0(Size size)
Definition: mcxt.c:878
bool sendDescrip
Definition: printtup.c:61
int16 * formats
Definition: portal.h:157
uintptr_t Datum
Definition: postgres.h:372
#define VARSIZE_ANY(PTR)
Definition: postgres.h:334
static void printtup_destroy(DestReceiver *self)
Definition: printtup.c:482
#define NULL
Definition: c.h:229
#define Assert(condition)
Definition: c.h:675
#define lfirst(lc)
Definition: pg_list.h:106
bool typisvarlena
Definition: printtup.c:52
static void printtup_startup(DestReceiver *self, int operation, TupleDesc typeinfo)
Definition: printtup.c:125
static bool printtup_20(TupleTableSlot *slot, DestReceiver *self)
Definition: printtup.c:384
static bool printtup(TupleTableSlot *slot, DestReceiver *self)
Definition: printtup.c:299
bool debugtup(TupleTableSlot *slot, DestReceiver *self)
Definition: printtup.c:532
#define DatumGetPointer(X)
Definition: postgres.h:555
AttrNumber resorigcol
Definition: primnodes.h:1374
void pq_sendbytes(StringInfo buf, const char *data, int datalen)
Definition: pqformat.c:115
char * OidOutputFunctionCall(Oid functionId, Datum val)
Definition: fmgr.c:1747
int errmsg(const char *fmt,...)
Definition: elog.c:797
void pq_sendint(StringInfo buf, int i, int b)
Definition: pqformat.c:236
void pq_endmessage(StringInfo buf)
Definition: pqformat.c:344
int i
Datum slot_getattr(TupleTableSlot *slot, int attnum, bool *isnull)
Definition: heaptuple.c:1141
#define NameStr(name)
Definition: c.h:499
bool(* receiveSlot)(TupleTableSlot *slot, DestReceiver *self)
Definition: dest.h:118
Definition: c.h:439
static void printtup_shutdown(DestReceiver *self)
Definition: printtup.c:462
static char format
Definition: pg_basebackup.c:80
List * FetchPortalTargetList(Portal portal)
Definition: pquery.c:338
void debugStartup(DestReceiver *self, int operation, TupleDesc typeinfo)
Definition: printtup.c:513
void pq_puttextmessage(char msgtype, const char *str)
Definition: pqformat.c:400
Definition: pg_list.h:45
ProtocolVersion FrontendProtocol
Definition: globals.c:27
FmgrInfo finfo
Definition: printtup.c:54