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postgresql/src/pl/plperl/plperl.c

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/**********************************************************************
* plperl.c - perl as a procedural language for PostgreSQL
*
* IDENTIFICATION
*
* This software is copyrighted by Mark Hollomon
* but is shameless cribbed from pltcl.c by Jan Weick.
*
* The author hereby grants permission to use, copy, modify,
* distribute, and license this software and its documentation
* for any purpose, provided that existing copyright notices are
* retained in all copies and that this notice is included
* verbatim in any distributions. No written agreement, license,
* or royalty fee is required for any of the authorized uses.
* Modifications to this software may be copyrighted by their
* author and need not follow the licensing terms described
* here, provided that the new terms are clearly indicated on
* the first page of each file where they apply.
*
* IN NO EVENT SHALL THE AUTHOR OR DISTRIBUTORS BE LIABLE TO ANY
* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR
* CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF THIS
* SOFTWARE, ITS DOCUMENTATION, OR ANY DERIVATIVES THEREOF, EVEN
* IF THE AUTHOR HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE AUTHOR AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, AND NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON
* AN "AS IS" BASIS, AND THE AUTHOR AND DISTRIBUTORS HAVE NO
* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
* ENHANCEMENTS, OR MODIFICATIONS.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/pl/plperl/plperl.c,v 1.67.4.13 2010/05/17 20:46:12 adunstan Exp $
*
**********************************************************************/
#include "postgres.h"
/* system stuff */
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <locale.h>
/* postgreSQL stuff */
#include "commands/trigger.h"
#include "executor/spi.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "mb/pg_wchar.h"
#include "utils/lsyscache.h"
#include "utils/typcache.h"
#include "utils/hsearch.h"
/* perl stuff */
/* stop perl from hijacking stdio and other stuff */
#ifdef WIN32
#define WIN32IO_IS_STDIO
#endif
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "ppport.h"
/* just in case these symbols aren't provided */
#ifndef pTHX_
#define pTHX_
#define pTHX void
#endif
/* perl may have a different width of "bool", don't buy it */
#ifdef bool
#undef bool
#endif
/* defines PLPERL_SET_OPMASK */
#include "plperl_opmask.h"
EXTERN_C void boot_DynaLoader(pTHX_ CV *cv);
EXTERN_C void boot_SPI(pTHX_ CV *cv);
/**********************************************************************
* Information associated with a Perl interpreter. We have one interpreter
* that is used for all plperlu (untrusted) functions. For plperl (trusted)
* functions, there is a separate interpreter for each effective SQL userid.
* (This is needed to ensure that an unprivileged user can't inject Perl code
* that'll be executed with the privileges of some other SQL user.)
*
* The plperl_interp_desc structs are kept in a Postgres hash table indexed
* by userid OID, with OID 0 used for the single untrusted interpreter.
*
* We start out by creating a "held" interpreter, which we initialize
* only as far as we can do without deciding if it will be trusted or
* untrusted. Later, when we first need to run a plperl or plperlu
* function, we complete the initialization appropriately and move the
* PerlInterpreter pointer into the plperl_interp_hash hashtable. If after
* that we need more interpreters, we create them as needed if we can, or
* fail if the Perl build doesn't support multiple interpreters.
*
* The reason for all the dancing about with a held interpreter is to make
* it possible for people to preload a lot of Perl code at postmaster startup
* (using plperl.on_init) and then use that code in backends. Of course this
* will only work for the first interpreter created in any backend, but it's
* still useful with that restriction.
**********************************************************************/
typedef struct plperl_interp_desc
{
Oid user_id; /* Hash key (must be first!) */
PerlInterpreter *interp; /* The interpreter */
} plperl_interp_desc;
/**********************************************************************
* The information we cache about loaded procedures
**********************************************************************/
typedef struct plperl_proc_desc
{
char *proname;
TransactionId fn_xmin;
CommandId fn_cmin;
plperl_interp_desc *interp; /* interpreter it's created in */
bool fn_readonly;
bool lanpltrusted;
bool fn_retistuple; /* true, if function returns tuple */
bool fn_retisset; /* true, if function returns set */
Oid result_oid; /* Oid of result type */
FmgrInfo result_in_func; /* I/O function and arg for result type */
Oid result_typioparam;
int nargs;
FmgrInfo arg_out_func[FUNC_MAX_ARGS];
Oid arg_typioparam[FUNC_MAX_ARGS];
bool arg_is_rowtype[FUNC_MAX_ARGS];
SV *reference;
} plperl_proc_desc;
/**********************************************************************
* Global data
**********************************************************************/
static bool plperl_firstcall = true;
static HTAB *plperl_interp_hash = NULL;
static HTAB *plperl_proc_hash = NULL;
static plperl_interp_desc *plperl_active_interp = NULL;
/* If we have an unassigned "held" interpreter, it's stored here */
static PerlInterpreter *plperl_held_interp = NULL;
static OP *(*pp_require_orig) (pTHX) = NULL;
static char plperl_opmask[MAXO];
/* this is saved and restored by plperl_call_handler */
static plperl_proc_desc *plperl_current_prodesc = NULL;
/**********************************************************************
* Forward declarations
**********************************************************************/
Datum plperl_call_handler(PG_FUNCTION_ARGS);
void plperl_init(void);
HV *plperl_spi_exec(char *query, int limit);
static PerlInterpreter *plperl_init_interp(void);
static void set_interp_require(bool trusted);
static Datum plperl_func_handler(PG_FUNCTION_ARGS);
static Datum plperl_trigger_handler(PG_FUNCTION_ARGS);
static plperl_proc_desc *compile_plperl_function(Oid fn_oid, bool is_trigger);
static SV *plperl_hash_from_tuple(HeapTuple tuple, TupleDesc tupdesc);
static void plperl_init_shared_libs(pTHX);
static void plperl_trusted_init(void);
static void plperl_untrusted_init(void);
static HV *plperl_spi_execute_fetch_result(SPITupleTable *, int, int);
static void plperl_create_sub(plperl_proc_desc *desc, char *s, Oid fn_oid);
static char *strip_trailing_ws(const char *msg);
static OP *pp_require_safe(pTHX);
static void activate_interpreter(plperl_interp_desc *interp_desc);
#ifdef WIN32
static char *setlocale_perl(int category, char *locale);
#endif
/**********************************************************************
* For speedy lookup, we maintain a hash table mapping from
* function OID + trigger flag + user OID to plperl_proc_desc pointers.
* The reason the plperl_proc_desc struct isn't directly part of the hash
* entry is to simplify recovery from errors during compile_plperl_function.
*
* Note: if the same function is called by multiple userIDs within a session,
* there will be a separate plperl_proc_desc entry for each userID in the case
* of plperl functions, but only one entry for plperlu functions, because we
* set user_id = 0 for that case. If the user redeclares the same function
* from plperl to plperlu or vice versa, there might be multiple
* plperl_proc_ptr entries in the hashtable, but only one is valid.
**********************************************************************/
typedef struct plperl_proc_key
{
Oid proc_id; /* Function OID */
/*
* is_trigger is really a bool, but declare as Oid to ensure this struct
* contains no padding
*/
Oid is_trigger; /* is it a trigger function? */
Oid user_id; /* User calling the function, or 0 */
} plperl_proc_key;
typedef struct plperl_proc_ptr
{
plperl_proc_key proc_key; /* Hash key (must be first!) */
plperl_proc_desc *proc_ptr;
} plperl_proc_ptr;
/*
* This routine is a crock, and so is everyplace that calls it. The problem
* is that the cached form of plperl functions/queries is allocated permanently
* (mostly via malloc()) and never released until backend exit. Subsidiary
* data structures such as fmgr info records therefore must live forever
* as well. A better implementation would store all this stuff in a per-
* function memory context that could be reclaimed at need. In the meantime,
* fmgr_info_cxt must be called specifying TopMemoryContext so that whatever
* it might allocate, and whatever the eventual function might allocate using
* fn_mcxt, will live forever too.
*/
static void
perm_fmgr_info(Oid functionId, FmgrInfo *finfo)
{
fmgr_info_cxt(functionId, finfo, TopMemoryContext);
}
/**********************************************************************
* plperl_init() - Initialize everything that can be
* safely initialized during postmaster
* startup.
*
* DO NOT make this static --- it has to be callable by preload
**********************************************************************/
void
plperl_init(void)
{
HASHCTL hash_ctl;
/************************************************************
* Do initialization only once
************************************************************/
if (!plperl_firstcall)
return;
memset(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(Oid);
hash_ctl.entrysize = sizeof(plperl_interp_desc);
hash_ctl.hash = tag_hash;
plperl_interp_hash = hash_create("PL/Perl interpreters",
8,
&hash_ctl,
HASH_ELEM | HASH_FUNCTION);
memset(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(plperl_proc_key);
hash_ctl.entrysize = sizeof(plperl_proc_ptr);
hash_ctl.hash = tag_hash;
plperl_proc_hash = hash_create("PL/Perl procedures",
32,
&hash_ctl,
HASH_ELEM | HASH_FUNCTION);
/************************************************************
* Create the Perl interpreter
************************************************************/
PLPERL_SET_OPMASK(plperl_opmask);
plperl_held_interp = plperl_init_interp();
plperl_firstcall = false;
}
/**********************************************************************
* plperl_init_all() - Initialize all
**********************************************************************/
static void
plperl_init_all(void)
{
/************************************************************
* Execute postmaster-startup safe initialization
************************************************************/
if (plperl_firstcall)
plperl_init();
/************************************************************
* Any other initialization that must be done each time a new
* backend starts -- currently none
************************************************************/
}
#define PLC_TRUSTED \
"require strict; "
static void
set_interp_require(bool trusted)
{
if (trusted)
{
PL_ppaddr[OP_REQUIRE] = pp_require_safe;
PL_ppaddr[OP_DOFILE] = pp_require_safe;
}
else
{
PL_ppaddr[OP_REQUIRE] = pp_require_orig;
PL_ppaddr[OP_DOFILE] = pp_require_orig;
}
}
/*
* Select and activate an appropriate Perl interpreter.
*/
static void
select_perl_context(bool trusted)
{
Oid user_id;
plperl_interp_desc *interp_desc;
bool found;
PerlInterpreter *interp = NULL;
/* Find or create the interpreter hashtable entry for this userid */
if (trusted)
user_id = GetUserId();
else
user_id = InvalidOid;
interp_desc = hash_search(plperl_interp_hash, &user_id,
HASH_ENTER,
&found);
if (!found)
{
/* Initialize newly-created hashtable entry */
interp_desc->interp = NULL;
}
/*
* Quick exit if already have an interpreter
*/
if (interp_desc->interp)
{
activate_interpreter(interp_desc);
return;
}
/*
* adopt held interp if free, else create new one if possible
*/
if (plperl_held_interp != NULL)
{
/* first actual use of a perl interpreter */
interp = plperl_held_interp;
/*
* Reset the plperl_held_interp pointer first; if we fail during init
* we don't want to try again with the partially-initialized interp.
*/
plperl_held_interp = NULL;
if (trusted)
plperl_trusted_init();
else
plperl_untrusted_init();
}
else
{
#ifdef MULTIPLICITY
/*
* plperl_init_interp will change Perl's idea of the active
* interpreter. Reset plperl_active_interp temporarily, so that if we
* hit an error partway through here, we'll make sure to switch back
* to a non-broken interpreter before running any other Perl
* functions.
*/
plperl_active_interp = NULL;
/* Now build the new interpreter */
interp = plperl_init_interp();
if (trusted)
plperl_trusted_init();
else
plperl_untrusted_init();
#else
elog(ERROR,
"cannot allocate multiple Perl interpreters on this platform");
#endif
}
set_interp_require(trusted);
/* Fully initialized, so mark the hashtable entry valid */
interp_desc->interp = interp;
/* And mark this as the active interpreter */
plperl_active_interp = interp_desc;
}
/*
* Make the specified interpreter the active one
*
* A call with NULL does nothing. This is so that "restoring" to a previously
* null state of plperl_active_interp doesn't result in useless thrashing.
*/
static void
activate_interpreter(plperl_interp_desc *interp_desc)
{
if (interp_desc && plperl_active_interp != interp_desc)
{
Assert(interp_desc->interp);
PERL_SET_CONTEXT(interp_desc->interp);
/* trusted iff user_id isn't InvalidOid */
set_interp_require(OidIsValid(interp_desc->user_id));
plperl_active_interp = interp_desc;
}
}
/*
* Create a new Perl interpreter.
*
* We initialize the interpreter as far as we can without knowing whether
* it will become a trusted or untrusted interpreter; in particular, the
* plperl.on_init code will get executed. Later, either plperl_trusted_init
* or plperl_untrusted_init must be called to complete the initialization.
*/
static PerlInterpreter *
plperl_init_interp(void)
{
PerlInterpreter *plperl;
static int perl_sys_init_done;
static char *embedding[3] = {
"", "-e",
/*
* no commas between the next lines please. They are supposed to be
* one string
*/
"SPI::bootstrap(); use vars qw(%_SHARED);"
"sub ::mkfunc {return eval(qq[ sub { $_[0] $_[1] } ]); }"
};
#ifdef WIN32
/*
* The perl library on startup does horrible things like call
* setlocale(LC_ALL,""). We have protected against that on most platforms
* by setting the environment appropriately. However, on Windows,
* setlocale() does not consult the environment, so we need to save the
* excisting locale settings before perl has a chance to mangle them and
* restore them after its dirty deeds are done.
*
* MSDN ref:
* http://msdn.microsoft.com/library/en-us/vclib/html/_crt_locale.asp
*
* It appaers that we only need to do this on interpreter startup, and
* subsequent calls to the interpreter don't mess with the locale
* settings.
*
* We restore them using Perl's perl_setlocale() function so that Perl
* doesn't have a different idea of the locale from Postgres.
*
*/
char *loc;
char *save_collate,
*save_ctype,
*save_monetary,
*save_numeric,
*save_time;
loc = setlocale(LC_COLLATE, NULL);
save_collate = loc ? pstrdup(loc) : NULL;
loc = setlocale(LC_CTYPE, NULL);
save_ctype = loc ? pstrdup(loc) : NULL;
loc = setlocale(LC_MONETARY, NULL);
save_monetary = loc ? pstrdup(loc) : NULL;
loc = setlocale(LC_NUMERIC, NULL);
save_numeric = loc ? pstrdup(loc) : NULL;
loc = setlocale(LC_TIME, NULL);
save_time = loc ? pstrdup(loc) : NULL;
#define PLPERL_RESTORE_LOCALE(name, saved) \
STMT_START { \
if (saved != NULL) { setlocale_perl(name, saved); pfree(saved); } \
} STMT_END
#endif
/****
* The perl API docs state that PERL_SYS_INIT3 should be called before
* allocating interprters. Unfortunately, on some platforms this fails
* in the Perl_do_taint() routine, which is called when the platform is
* using the system's malloc() instead of perl's own. Other platforms,
* notably Windows, fail if PERL_SYS_INIT3 is not called. So we call it
* if it's available, unless perl is using the system malloc(), which is
* true when MYMALLOC is set.
*/
#if defined(PERL_SYS_INIT3) && !defined(MYMALLOC)
if (!perl_sys_init_done)
{
int nargs;
char *dummy_perl_env[1];
/* initialize this way to silence silly compiler warnings */
nargs = 3;
dummy_perl_env[0] = NULL;
PERL_SYS_INIT3(&nargs, (char ***) &embedding, (char ***) &dummy_perl_env);
perl_sys_init_done = 1;
}
#endif
plperl = perl_alloc();
if (!plperl)
elog(ERROR, "could not allocate Perl interpreter");
PERL_SET_CONTEXT(plperl);
perl_construct(plperl);
/*
* Record the original function for the 'require' and 'dofile' opcodes.
* (They share the same implementation.) Ensure it's used for new
* interpreters.
*/
if (!pp_require_orig)
{
pp_require_orig = PL_ppaddr[OP_REQUIRE];
}
else
{
PL_ppaddr[OP_REQUIRE] = pp_require_orig;
PL_ppaddr[OP_DOFILE] = pp_require_orig;
}
if (perl_parse(plperl, plperl_init_shared_libs,
3, embedding, NULL) != 0)
ereport(ERROR,
(errmsg("%s", strip_trailing_ws(SvPV_nolen(ERRSV))),
errcontext("while parsing Perl initialization")));
if (perl_run(plperl) != 0)
ereport(ERROR,
(errmsg("%s", strip_trailing_ws(SvPV_nolen(ERRSV))),
errcontext("while running Perl initialization")));
#ifdef PLPERL_RESTORE_LOCALE
PLPERL_RESTORE_LOCALE(LC_COLLATE, save_collate);
PLPERL_RESTORE_LOCALE(LC_CTYPE, save_ctype);
PLPERL_RESTORE_LOCALE(LC_MONETARY, save_monetary);
PLPERL_RESTORE_LOCALE(LC_NUMERIC, save_numeric);
PLPERL_RESTORE_LOCALE(LC_TIME, save_time);
#endif
return plperl;
}
/*
* Our safe implementation of the require opcode.
* This is safe because it's completely unable to load any code.
* If the requested file/module has already been loaded it'll return true.
* If not, it'll die.
* So now "use Foo;" will work iff Foo has already been loaded.
*/
static OP *
pp_require_safe(pTHX)
{
dVAR;
dSP;
SV *sv,
**svp;
char *name;
STRLEN len;
sv = POPs;
name = SvPV(sv, len);
if (!(name && len > 0 && *name))
RETPUSHNO;
svp = hv_fetch(GvHVn(PL_incgv), name, len, 0);
if (svp && *svp != &PL_sv_undef)
RETPUSHYES;
DIE(aTHX_ "Unable to load %s into plperl", name);
}
/*
* Initialize the current Perl interpreter as a trusted interp
*/
static void
plperl_trusted_init(void)
{
HV *stash;
SV *sv;
char *key;
I32 klen;
/* use original require while we set up */
PL_ppaddr[OP_REQUIRE] = pp_require_orig;
PL_ppaddr[OP_DOFILE] = pp_require_orig;
eval_pv(PLC_TRUSTED, FALSE);
if (SvTRUE(ERRSV))
ereport(ERROR,
(errmsg("%s", strip_trailing_ws(SvPV_nolen(ERRSV))),
errcontext("while executing PLC_TRUSTED")));
if (GetDatabaseEncoding() == PG_UTF8)
{
/*
* Force loading of utf8 module now to prevent errors that can arise
* from the regex code later trying to load utf8 modules. See
* http://rt.perl.org/rt3/Ticket/Display.html?id=47576
*/
eval_pv("my $a=chr(0x100); return $a =~ /\\xa9/i", FALSE);
if (SvTRUE(ERRSV))
ereport(ERROR,
(errmsg("%s", strip_trailing_ws(SvPV_nolen(ERRSV))),
errcontext("while executing utf8fix")));
}
/*
* Lock down the interpreter
*/
/* switch to the safe require/dofile opcode for future code */
PL_ppaddr[OP_REQUIRE] = pp_require_safe;
PL_ppaddr[OP_DOFILE] = pp_require_safe;
/*
* prevent (any more) unsafe opcodes being compiled
* PL_op_mask is per interpreter, so this only needs to be set once
*/
PL_op_mask = plperl_opmask;
/* delete the DynaLoader:: namespace so extensions can't be loaded */
stash = gv_stashpv("DynaLoader", GV_ADDWARN);
hv_iterinit(stash);
while ((sv = hv_iternextsv(stash, &key, &klen)))
{
if (!isGV_with_GP(sv) || !GvCV(sv))
continue;
SvREFCNT_dec(GvCV(sv)); /* free the CV */
GvCV(sv) = NULL; /* prevent call via GV */
}
hv_clear(stash);
/* invalidate assorted caches */
++PL_sub_generation;
#ifdef PL_stashcache
hv_clear(PL_stashcache);
#endif
}
/*
* Initialize the current Perl interpreter as an untrusted interp
*/
static void
plperl_untrusted_init(void)
{
/*
* Nothing to do here
*/
}
/*
* Perl likes to put a newline after its error messages; clean up such
*/
static char *
strip_trailing_ws(const char *msg)
{
char *res = pstrdup(msg);
int len = strlen(res);
while (len > 0 && isspace((unsigned char) res[len - 1]))
res[--len] = '\0';
return res;
}
/*
* Build a tuple from a hash
*/
static HeapTuple
plperl_build_tuple_result(HV *perlhash, AttInMetadata *attinmeta)
{
TupleDesc td = attinmeta->tupdesc;
char **values;
SV *val;
char *key;
I32 klen;
HeapTuple tup;
values = (char **) palloc0(td->natts * sizeof(char *));
hv_iterinit(perlhash);
while ((val = hv_iternextsv(perlhash, &key, &klen)))
{
int attn = SPI_fnumber(td, key);
if (attn <= 0 || td->attrs[attn - 1]->attisdropped)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("Perl hash contains nonexistent column \"%s\"",
key)));
if (SvOK(val))
values[attn - 1] = SvPV(val, PL_na);
}
hv_iterinit(perlhash);
tup = BuildTupleFromCStrings(attinmeta, values);
pfree(values);
return tup;
}
/**********************************************************************
* set up arguments for a trigger call
**********************************************************************/
static SV *
plperl_trigger_build_args(FunctionCallInfo fcinfo)
{
TriggerData *tdata;
TupleDesc tupdesc;
int i;
char *level;
char *event;
char *relid;
char *when;
HV *hv;
hv = newHV();
tdata = (TriggerData *) fcinfo->context;
tupdesc = tdata->tg_relation->rd_att;
relid = DatumGetCString(
DirectFunctionCall1(oidout,
ObjectIdGetDatum(tdata->tg_relation->rd_id)
)
);
(void) hv_store(hv, "name", 4, newSVpv(tdata->tg_trigger->tgname, 0), 0);
(void) hv_store(hv, "relid", 5, newSVpv(relid, 0), 0);
if (TRIGGER_FIRED_BY_INSERT(tdata->tg_event))
{
event = "INSERT";
if (TRIGGER_FIRED_FOR_ROW(tdata->tg_event))
(void) hv_store(hv, "new", 3,
plperl_hash_from_tuple(tdata->tg_trigtuple, tupdesc),
0);
}
else if (TRIGGER_FIRED_BY_DELETE(tdata->tg_event))
{
event = "DELETE";
if (TRIGGER_FIRED_FOR_ROW(tdata->tg_event))
(void) hv_store(hv, "old", 3,
plperl_hash_from_tuple(tdata->tg_trigtuple, tupdesc),
0);
}
else if (TRIGGER_FIRED_BY_UPDATE(tdata->tg_event))
{
event = "UPDATE";
if (TRIGGER_FIRED_FOR_ROW(tdata->tg_event))
{
(void) hv_store(hv, "old", 3,
plperl_hash_from_tuple(tdata->tg_trigtuple, tupdesc),
0);
(void) hv_store(hv, "new", 3,
plperl_hash_from_tuple(tdata->tg_newtuple, tupdesc),
0);
}
}
else
event = "UNKNOWN";
(void) hv_store(hv, "event", 5, newSVpv(event, 0), 0);
(void) hv_store(hv, "argc", 4, newSViv(tdata->tg_trigger->tgnargs), 0);
if (tdata->tg_trigger->tgnargs > 0)
{
AV *av = newAV();
for (i = 0; i < tdata->tg_trigger->tgnargs; i++)
av_push(av, newSVpv(tdata->tg_trigger->tgargs[i], 0));
(void) hv_store(hv, "args", 4, newRV_noinc((SV *) av), 0);
}
(void) hv_store(hv, "relname", 7,
newSVpv(SPI_getrelname(tdata->tg_relation), 0), 0);
if (TRIGGER_FIRED_BEFORE(tdata->tg_event))
when = "BEFORE";
else if (TRIGGER_FIRED_AFTER(tdata->tg_event))
when = "AFTER";
else
when = "UNKNOWN";
(void) hv_store(hv, "when", 4, newSVpv(when, 0), 0);
if (TRIGGER_FIRED_FOR_ROW(tdata->tg_event))
level = "ROW";
else if (TRIGGER_FIRED_FOR_STATEMENT(tdata->tg_event))
level = "STATEMENT";
else
level = "UNKNOWN";
(void) hv_store(hv, "level", 5, newSVpv(level, 0), 0);
return newRV_noinc((SV *) hv);
}
/*
* Obtain tuple descriptor for a function returning tuple
*
* NB: copy the result if needed for any great length of time
*/
static TupleDesc
get_function_tupdesc(Oid result_type, ReturnSetInfo *rsinfo)
{
if (result_type == RECORDOID)
{
/* We must get the information from call context */
if (!rsinfo || !IsA(rsinfo, ReturnSetInfo) ||
rsinfo->expectedDesc == NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("function returning record called in context "
"that cannot accept type record")));
return rsinfo->expectedDesc;
}
else /* ordinary composite type */
return lookup_rowtype_tupdesc(result_type, -1);
}
/**********************************************************************
* set up the new tuple returned from a trigger
**********************************************************************/
static HeapTuple
plperl_modify_tuple(HV *hvTD, TriggerData *tdata, HeapTuple otup)
{
SV **svp;
HV *hvNew;
HeapTuple rtup;
SV *val;
char *key;
I32 klen;
int slotsused;
int *modattrs;
Datum *modvalues;
char *modnulls;
TupleDesc tupdesc;
tupdesc = tdata->tg_relation->rd_att;
svp = hv_fetch(hvTD, "new", 3, FALSE);
if (!svp)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("$_TD->{new} does not exist")));
if (!SvOK(*svp) || !SvROK(*svp) || SvTYPE(SvRV(*svp)) != SVt_PVHV)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("$_TD->{new} is not a hash reference")));
hvNew = (HV *) SvRV(*svp);
modattrs = palloc(tupdesc->natts * sizeof(int));
modvalues = palloc(tupdesc->natts * sizeof(Datum));
modnulls = palloc(tupdesc->natts * sizeof(char));
slotsused = 0;
hv_iterinit(hvNew);
while ((val = hv_iternextsv(hvNew, &key, &klen)))
{
int attn = SPI_fnumber(tupdesc, key);
if (attn <= 0 || tupdesc->attrs[attn - 1]->attisdropped)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("Perl hash contains nonexistent column \"%s\"",
key)));
if (SvOK(val))
{
Oid typinput;
Oid typioparam;
FmgrInfo finfo;
/* XXX would be better to cache these lookups */
getTypeInputInfo(tupdesc->attrs[attn - 1]->atttypid,
&typinput, &typioparam);
fmgr_info(typinput, &finfo);
modvalues[slotsused] = FunctionCall3(&finfo,
CStringGetDatum(SvPV(val, PL_na)),
ObjectIdGetDatum(typioparam),
Int32GetDatum(tupdesc->attrs[attn - 1]->atttypmod));
modnulls[slotsused] = ' ';
}
else
{
modvalues[slotsused] = (Datum) 0;
modnulls[slotsused] = 'n';
}
modattrs[slotsused] = attn;
slotsused++;
}
hv_iterinit(hvNew);
rtup = SPI_modifytuple(tdata->tg_relation, otup, slotsused,
modattrs, modvalues, modnulls);
pfree(modattrs);
pfree(modvalues);
pfree(modnulls);
if (rtup == NULL)
elog(ERROR, "SPI_modifytuple failed: %s",
SPI_result_code_string(SPI_result));
return rtup;
}
/**********************************************************************
* plperl_call_handler - This is the only visible function
* of the PL interpreter. The PostgreSQL
* function manager and trigger manager
* call this function for execution of
* perl procedures.
**********************************************************************/
PG_FUNCTION_INFO_V1(plperl_call_handler);
/* keep non-static */
Datum
plperl_call_handler(PG_FUNCTION_ARGS)
{
Datum retval;
plperl_proc_desc *save_prodesc;
plperl_interp_desc *oldinterp;
/*
* Initialize interpreter if first time through
*/
plperl_init_all();
/*
* Ensure that static pointers are saved/restored properly
*/
save_prodesc = plperl_current_prodesc;
oldinterp = plperl_active_interp;
PG_TRY();
{
/*
* Determine if called as function or trigger and call appropriate
* subhandler
*/
if (CALLED_AS_TRIGGER(fcinfo))
retval = PointerGetDatum(plperl_trigger_handler(fcinfo));
else
retval = plperl_func_handler(fcinfo);
}
PG_CATCH();
{
plperl_current_prodesc = save_prodesc;
activate_interpreter(oldinterp);
PG_RE_THROW();
}
PG_END_TRY();
plperl_current_prodesc = save_prodesc;
activate_interpreter(oldinterp);
return retval;
}
/**********************************************************************
* plperl_create_sub() - calls the perl interpreter to
* create the anonymous subroutine whose text is in the SV.
* Returns the SV containing the RV to the closure.
**********************************************************************/
static void
plperl_create_sub(plperl_proc_desc *prodesc, char *s, Oid fn_oid)
{
dSP;
SV *subref;
int count;
ENTER;
SAVETMPS;
PUSHMARK(SP);
XPUSHs(sv_2mortal(newSVpv("my $_TD=$_[0]; shift;", 0)));
XPUSHs(sv_2mortal(newSVpv(s, 0)));
PUTBACK;
/*
* G_KEEPERR seems to be needed here, else we don't recognize compile
* errors properly. Perhaps it's because there's another level of eval
* inside mkfunc?
*/
count = perl_call_pv("::mkfunc", G_SCALAR | G_EVAL | G_KEEPERR);
SPAGAIN;
if (count != 1)
{
PUTBACK;
FREETMPS;
LEAVE;
elog(ERROR, "didn't get a return item from mkfunc");
}
if (SvTRUE(ERRSV))
{
(void) POPs;
PUTBACK;
FREETMPS;
LEAVE;
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("creation of Perl function failed: %s",
strip_trailing_ws(SvPV(ERRSV, PL_na)))));
}
/*
* need to make a deep copy of the return. it comes off the stack as a
* temporary.
*/
subref = newSVsv(POPs);
if (!SvROK(subref))
{
PUTBACK;
FREETMPS;
LEAVE;
/*
* subref is our responsibility because it is not mortal
*/
SvREFCNT_dec(subref);
elog(ERROR, "didn't get a code ref");
}
PUTBACK;
FREETMPS;
LEAVE;
prodesc->reference = subref;
}
/**********************************************************************
* plperl_init_shared_libs() -
*
* We cannot use the DynaLoader directly to get at the Opcode
* module. So, we link Opcode into ourselves
* and do the initialization behind perl's back.
*
**********************************************************************/
static void
plperl_init_shared_libs(pTHX)
{
char *file = __FILE__;
newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
newXS("SPI::bootstrap", boot_SPI, file);
}
/**********************************************************************
* plperl_call_perl_func() - calls a perl function through the RV
* stored in the prodesc structure. massages the input parms properly
**********************************************************************/
static SV *
plperl_call_perl_func(plperl_proc_desc *desc, FunctionCallInfo fcinfo)
{
dSP;
SV *retval;
int i;
int count;
ENTER;
SAVETMPS;
PUSHMARK(SP);
XPUSHs(sv_2mortal(newSVpv("undef", 0))); /* no trigger data */
for (i = 0; i < desc->nargs; i++)
{
if (fcinfo->argnull[i])
XPUSHs(&PL_sv_undef);
else if (desc->arg_is_rowtype[i])
{
HeapTupleHeader td;
Oid tupType;
int32 tupTypmod;
TupleDesc tupdesc;
HeapTupleData tmptup;
SV *hashref;
td = DatumGetHeapTupleHeader(fcinfo->arg[i]);
/* Extract rowtype info and find a tupdesc */
tupType = HeapTupleHeaderGetTypeId(td);
tupTypmod = HeapTupleHeaderGetTypMod(td);
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
tupdesc = CreateTupleDescCopy(tupdesc);
/* Build a temporary HeapTuple control structure */
tmptup.t_len = HeapTupleHeaderGetDatumLength(td);
tmptup.t_data = td;
hashref = plperl_hash_from_tuple(&tmptup, tupdesc);
XPUSHs(sv_2mortal(hashref));
FreeTupleDesc(tupdesc);
}
else
{
char *tmp;
tmp = DatumGetCString(FunctionCall3(&(desc->arg_out_func[i]),
fcinfo->arg[i],
ObjectIdGetDatum(desc->arg_typioparam[i]),
Int32GetDatum(-1)));
XPUSHs(sv_2mortal(newSVpv(tmp, 0)));
pfree(tmp);
}
}
PUTBACK;
/* Do NOT use G_KEEPERR here */
count = perl_call_sv(desc->reference, G_SCALAR | G_EVAL);
SPAGAIN;
if (count != 1)
{
PUTBACK;
FREETMPS;
LEAVE;
elog(ERROR, "didn't get a return item from function");
}
if (SvTRUE(ERRSV))
{
(void) POPs;
PUTBACK;
FREETMPS;
LEAVE;
/* XXX need to find a way to assign an errcode here */
ereport(ERROR,
(errmsg("error from Perl function: %s",
strip_trailing_ws(SvPV(ERRSV, PL_na)))));
}
retval = newSVsv(POPs);
PUTBACK;
FREETMPS;
LEAVE;
return retval;
}
/**********************************************************************
* plperl_call_perl_trigger_func() - calls a perl trigger function
* through the RV stored in the prodesc structure.
**********************************************************************/
static SV *
plperl_call_perl_trigger_func(plperl_proc_desc *desc, FunctionCallInfo fcinfo,
SV *td)
{
dSP;
SV *retval;
Trigger *tg_trigger;
int i;
int count;
ENTER;
SAVETMPS;
PUSHMARK(sp);
XPUSHs(td);
tg_trigger = ((TriggerData *) fcinfo->context)->tg_trigger;
for (i = 0; i < tg_trigger->tgnargs; i++)
XPUSHs(sv_2mortal(newSVpv(tg_trigger->tgargs[i], 0)));
PUTBACK;
/* Do NOT use G_KEEPERR here */
count = perl_call_sv(desc->reference, G_SCALAR | G_EVAL);
SPAGAIN;
if (count != 1)
{
PUTBACK;
FREETMPS;
LEAVE;
elog(ERROR, "didn't get a return item from trigger function");
}
if (SvTRUE(ERRSV))
{
(void) POPs;
PUTBACK;
FREETMPS;
LEAVE;
/* XXX need to find a way to assign an errcode here */
ereport(ERROR,
(errmsg("error from Perl trigger function: %s",
strip_trailing_ws(SvPV(ERRSV, PL_na)))));
}
retval = newSVsv(POPs);
PUTBACK;
FREETMPS;
LEAVE;
return retval;
}
/**********************************************************************
* plperl_func_handler() - Handler for regular function calls
**********************************************************************/
static Datum
plperl_func_handler(PG_FUNCTION_ARGS)
{
plperl_proc_desc *prodesc;
SV *perlret;
Datum retval;
/* Connect to SPI manager */
if (SPI_connect() != SPI_OK_CONNECT)
elog(ERROR, "could not connect to SPI manager");
/* Find or compile the function */
prodesc = compile_plperl_function(fcinfo->flinfo->fn_oid, false);
plperl_current_prodesc = prodesc;
activate_interpreter(prodesc->interp);
/************************************************************
* Call the Perl function if not returning set
************************************************************/
if (!prodesc->fn_retisset)
perlret = plperl_call_perl_func(prodesc, fcinfo);
else if (SRF_IS_FIRSTCALL())
perlret = plperl_call_perl_func(prodesc, fcinfo);
else
{
/* Get back the SV stashed on initial call */
FuncCallContext *funcctx = (FuncCallContext *) fcinfo->flinfo->fn_extra;
perlret = (SV *) funcctx->user_fctx;
}
/************************************************************
* Disconnect from SPI manager and then create the return
* values datum (if the input function does a palloc for it
* this must not be allocated in the SPI memory context
* because SPI_finish would free it).
************************************************************/
if (SPI_finish() != SPI_OK_FINISH)
elog(ERROR, "SPI_finish() failed");
if (!(perlret && SvOK(perlret)))
{
/* return NULL if Perl code returned undef */
ReturnSetInfo *rsi = (ReturnSetInfo *) fcinfo->resultinfo;
if (perlret)
SvREFCNT_dec(perlret);
if (rsi && IsA(rsi, ReturnSetInfo))
rsi->isDone = ExprEndResult;
PG_RETURN_NULL();
}
if (prodesc->fn_retisset && prodesc->fn_retistuple)
{
/* set of tuples */
AV *ret_av;
FuncCallContext *funcctx;
TupleDesc tupdesc;
AttInMetadata *attinmeta;
if (!SvOK(perlret) || !SvROK(perlret) || SvTYPE(SvRV(perlret)) != SVt_PVAV)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("set-returning Perl function must return reference to array")));
ret_av = (AV *) SvRV(perlret);
if (SRF_IS_FIRSTCALL())
{
MemoryContext oldcontext;
funcctx = SRF_FIRSTCALL_INIT();
funcctx->user_fctx = (void *) perlret;
funcctx->max_calls = av_len(ret_av) + 1;
/* Cache a copy of the result's tupdesc and attinmeta */
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
tupdesc = get_function_tupdesc(prodesc->result_oid,
(ReturnSetInfo *) fcinfo->resultinfo);
tupdesc = CreateTupleDescCopy(tupdesc);
funcctx->attinmeta = TupleDescGetAttInMetadata(tupdesc);
MemoryContextSwitchTo(oldcontext);
}
funcctx = SRF_PERCALL_SETUP();
attinmeta = funcctx->attinmeta;
tupdesc = attinmeta->tupdesc;
if (funcctx->call_cntr < funcctx->max_calls)
{
SV **svp;
HV *row_hv;
HeapTuple tuple;
svp = av_fetch(ret_av, funcctx->call_cntr, FALSE);
Assert(svp != NULL);
if (!SvOK(*svp) || !SvROK(*svp) || SvTYPE(SvRV(*svp)) != SVt_PVHV)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("elements of Perl result array must be reference to hash")));
row_hv = (HV *) SvRV(*svp);
tuple = plperl_build_tuple_result(row_hv, attinmeta);
retval = HeapTupleGetDatum(tuple);
SRF_RETURN_NEXT(funcctx, retval);
}
else
{
SvREFCNT_dec(perlret);
SRF_RETURN_DONE(funcctx);
}
}
else if (prodesc->fn_retisset)
{
/* set of non-tuples */
AV *ret_av;
FuncCallContext *funcctx;
if (!SvOK(perlret) || !SvROK(perlret) || SvTYPE(SvRV(perlret)) != SVt_PVAV)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("set-returning Perl function must return reference to array")));
ret_av = (AV *) SvRV(perlret);
if (SRF_IS_FIRSTCALL())
{
funcctx = SRF_FIRSTCALL_INIT();
funcctx->user_fctx = (void *) perlret;
funcctx->max_calls = av_len(ret_av) + 1;
}
funcctx = SRF_PERCALL_SETUP();
if (funcctx->call_cntr < funcctx->max_calls)
{
SV **svp;
svp = av_fetch(ret_av, funcctx->call_cntr, FALSE);
Assert(svp != NULL);
if (SvOK(*svp))
{
char *val = SvPV(*svp, PL_na);
fcinfo->isnull = false;
retval = FunctionCall3(&prodesc->result_in_func,
PointerGetDatum(val),
ObjectIdGetDatum(prodesc->result_typioparam),
Int32GetDatum(-1));
}
else
{
fcinfo->isnull = true;
retval = (Datum) 0;
}
SRF_RETURN_NEXT(funcctx, retval);
}
else
{
SvREFCNT_dec(perlret);
SRF_RETURN_DONE(funcctx);
}
}
else if (prodesc->fn_retistuple)
{
/* singleton perl hash to Datum */
HV *perlhash;
TupleDesc td;
AttInMetadata *attinmeta;
HeapTuple tup;
if (!SvOK(perlret) || !SvROK(perlret) || SvTYPE(SvRV(perlret)) != SVt_PVHV)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("composite-returning Perl function must return reference to hash")));
perlhash = (HV *) SvRV(perlret);
/*
* XXX should cache the attinmeta data instead of recomputing
*/
td = get_function_tupdesc(prodesc->result_oid,
(ReturnSetInfo *) fcinfo->resultinfo);
td = CreateTupleDescCopy(td);
attinmeta = TupleDescGetAttInMetadata(td);
tup = plperl_build_tuple_result(perlhash, attinmeta);
retval = HeapTupleGetDatum(tup);
}
else
{
/* perl string to Datum */
char *val = SvPV(perlret, PL_na);
retval = FunctionCall3(&prodesc->result_in_func,
CStringGetDatum(val),
ObjectIdGetDatum(prodesc->result_typioparam),
Int32GetDatum(-1));
}
SvREFCNT_dec(perlret);
return retval;
}
/**********************************************************************
* plperl_trigger_handler() - Handler for trigger function calls
**********************************************************************/
static Datum
plperl_trigger_handler(PG_FUNCTION_ARGS)
{
plperl_proc_desc *prodesc;
SV *perlret;
Datum retval;
SV *svTD;
HV *hvTD;
/* Connect to SPI manager */
if (SPI_connect() != SPI_OK_CONNECT)
elog(ERROR, "could not connect to SPI manager");
/* Find or compile the function */
prodesc = compile_plperl_function(fcinfo->flinfo->fn_oid, true);
plperl_current_prodesc = prodesc;
/************************************************************
* Call the Perl function
************************************************************/
activate_interpreter(prodesc->interp);
/*
* call perl trigger function and build TD hash
*/
svTD = plperl_trigger_build_args(fcinfo);
perlret = plperl_call_perl_trigger_func(prodesc, fcinfo, svTD);
hvTD = (HV *) SvRV(svTD); /* convert SV TD structure to Perl Hash
* structure */
/************************************************************
* Disconnect from SPI manager and then create the return
* values datum (if the input function does a palloc for it
* this must not be allocated in the SPI memory context
* because SPI_finish would free it).
************************************************************/
if (SPI_finish() != SPI_OK_FINISH)
elog(ERROR, "SPI_finish() failed");
if (perlret == NULL || !SvOK(perlret))
{
/* undef result means go ahead with original tuple */
TriggerData *trigdata = ((TriggerData *) fcinfo->context);
if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
retval = (Datum) trigdata->tg_trigtuple;
else if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
retval = (Datum) trigdata->tg_newtuple;
else if (TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
retval = (Datum) trigdata->tg_trigtuple;
else
retval = (Datum) 0; /* can this happen? */
}
else
{
HeapTuple trv;
char *tmp;
tmp = SvPV(perlret, PL_na);
if (pg_strcasecmp(tmp, "SKIP") == 0)
trv = NULL;
else if (pg_strcasecmp(tmp, "MODIFY") == 0)
{
TriggerData *trigdata = (TriggerData *) fcinfo->context;
if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
trv = plperl_modify_tuple(hvTD, trigdata,
trigdata->tg_trigtuple);
else if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
trv = plperl_modify_tuple(hvTD, trigdata,
trigdata->tg_newtuple);
else
{
ereport(WARNING,
(errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
errmsg("ignoring modified tuple in DELETE trigger")));
trv = NULL;
}
}
else
{
ereport(ERROR,
(errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
errmsg("result of Perl trigger function must be undef, \"SKIP\" or \"MODIFY\"")));
trv = NULL;
}
retval = PointerGetDatum(trv);
}
SvREFCNT_dec(svTD);
if (perlret)
SvREFCNT_dec(perlret);
return retval;
}
static bool
validate_plperl_function(plperl_proc_ptr *proc_ptr, HeapTuple procTup)
{
if (proc_ptr && proc_ptr->proc_ptr)
{
plperl_proc_desc *prodesc = proc_ptr->proc_ptr;
bool uptodate;
/************************************************************
* If it's present, must check whether it's still up to date.
* This is needed because CREATE OR REPLACE FUNCTION can modify the
* function's pg_proc entry without changing its OID.
************************************************************/
uptodate = (prodesc->fn_xmin == HeapTupleHeaderGetXmin(procTup->t_data) &&
prodesc->fn_cmin == HeapTupleHeaderGetCmin(procTup->t_data));
if (uptodate)
return true;
/* Otherwise, unlink the obsoleted entry from the hashtable ... */
proc_ptr->proc_ptr = NULL;
/* ... and throw it away */
if (prodesc->reference)
{
plperl_interp_desc *oldinterp = plperl_active_interp;
activate_interpreter(prodesc->interp);
SvREFCNT_dec(prodesc->reference);
activate_interpreter(oldinterp);
}
free(prodesc->proname);
free(prodesc);
}
return false;
}
/**********************************************************************
* compile_plperl_function - compile (or hopefully just look up) function
**********************************************************************/
static plperl_proc_desc *
compile_plperl_function(Oid fn_oid, bool is_trigger)
{
HeapTuple procTup;
Form_pg_proc procStruct;
plperl_proc_key proc_key;
plperl_proc_ptr *proc_ptr;
plperl_proc_desc *prodesc = NULL;
int i;
plperl_interp_desc *oldinterp = plperl_active_interp;
/* We'll need the pg_proc tuple in any case... */
procTup = SearchSysCache(PROCOID,
ObjectIdGetDatum(fn_oid),
0, 0, 0);
if (!HeapTupleIsValid(procTup))
elog(ERROR, "cache lookup failed for function %u", fn_oid);
procStruct = (Form_pg_proc) GETSTRUCT(procTup);
/* Try to find function in plperl_proc_hash */
proc_key.proc_id = fn_oid;
proc_key.is_trigger = is_trigger;
proc_key.user_id = GetUserId();
proc_ptr = hash_search(plperl_proc_hash, &proc_key,
HASH_FIND, NULL);
if (validate_plperl_function(proc_ptr, procTup))
prodesc = proc_ptr->proc_ptr;
else
{
/* If not found or obsolete, maybe it's plperlu */
proc_key.user_id = InvalidOid;
proc_ptr = hash_search(plperl_proc_hash, &proc_key,
HASH_FIND, NULL);
if (validate_plperl_function(proc_ptr, procTup))
prodesc = proc_ptr->proc_ptr;
}
/************************************************************
* If we haven't found it in the hashtable, we analyze
* the functions arguments and returntype and store
* the in-/out-functions in the prodesc block and create
* a new hashtable entry for it.
*
* Then we load the procedure into the Perl interpreter.
************************************************************/
if (prodesc == NULL)
{
HeapTuple langTup;
HeapTuple typeTup;
Form_pg_language langStruct;
Form_pg_type typeStruct;
Datum prosrcdatum;
bool isnull;
char *proc_source;
/************************************************************
* Allocate a new procedure description block
************************************************************/
prodesc = (plperl_proc_desc *) malloc(sizeof(plperl_proc_desc));
if (prodesc == NULL)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
MemSet(prodesc, 0, sizeof(plperl_proc_desc));
prodesc->proname = strdup(NameStr(procStruct->proname));
if (prodesc->proname == NULL)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
prodesc->fn_xmin = HeapTupleHeaderGetXmin(procTup->t_data);
prodesc->fn_cmin = HeapTupleHeaderGetCmin(procTup->t_data);
/* Remember if function is STABLE/IMMUTABLE */
prodesc->fn_readonly =
(procStruct->provolatile != PROVOLATILE_VOLATILE);
/************************************************************
* Lookup the pg_language tuple by Oid
************************************************************/
langTup = SearchSysCache(LANGOID,
ObjectIdGetDatum(procStruct->prolang),
0, 0, 0);
if (!HeapTupleIsValid(langTup))
{
free(prodesc->proname);
free(prodesc);
elog(ERROR, "cache lookup failed for language %u",
procStruct->prolang);
}
langStruct = (Form_pg_language) GETSTRUCT(langTup);
prodesc->lanpltrusted = langStruct->lanpltrusted;
ReleaseSysCache(langTup);
/************************************************************
* Get the required information for input conversion of the
* return value.
************************************************************/
if (!is_trigger)
{
typeTup = SearchSysCache(TYPEOID,
ObjectIdGetDatum(procStruct->prorettype),
0, 0, 0);
if (!HeapTupleIsValid(typeTup))
{
free(prodesc->proname);
free(prodesc);
elog(ERROR, "cache lookup failed for type %u",
procStruct->prorettype);
}
typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
/* Disallow pseudotype result, except VOID or RECORD */
if (typeStruct->typtype == 'p')
{
if (procStruct->prorettype == VOIDOID ||
procStruct->prorettype == RECORDOID)
/* okay */ ;
else if (procStruct->prorettype == TRIGGEROID)
{
free(prodesc->proname);
free(prodesc);
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("trigger functions may only be called as triggers")));
}
else
{
free(prodesc->proname);
free(prodesc);
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("plperl functions cannot return type %s",
format_type_be(procStruct->prorettype))));
}
}
prodesc->result_oid = procStruct->prorettype;
prodesc->fn_retisset = procStruct->proretset;
prodesc->fn_retistuple = (typeStruct->typtype == 'c' ||
procStruct->prorettype == RECORDOID);
perm_fmgr_info(typeStruct->typinput, &(prodesc->result_in_func));
prodesc->result_typioparam = getTypeIOParam(typeTup);
ReleaseSysCache(typeTup);
}
/************************************************************
* Get the required information for output conversion
* of all procedure arguments
************************************************************/
if (!is_trigger)
{
prodesc->nargs = procStruct->pronargs;
for (i = 0; i < prodesc->nargs; i++)
{
typeTup = SearchSysCache(TYPEOID,
ObjectIdGetDatum(procStruct->proargtypes[i]),
0, 0, 0);
if (!HeapTupleIsValid(typeTup))
{
free(prodesc->proname);
free(prodesc);
elog(ERROR, "cache lookup failed for type %u",
procStruct->proargtypes[i]);
}
typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
/* Disallow pseudotype argument */
if (typeStruct->typtype == 'p')
{
free(prodesc->proname);
free(prodesc);
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("plperl functions cannot take type %s",
format_type_be(procStruct->proargtypes[i]))));
}
if (typeStruct->typtype == 'c')
prodesc->arg_is_rowtype[i] = true;
else
{
prodesc->arg_is_rowtype[i] = false;
perm_fmgr_info(typeStruct->typoutput,
&(prodesc->arg_out_func[i]));
prodesc->arg_typioparam[i] = getTypeIOParam(typeTup);
}
ReleaseSysCache(typeTup);
}
}
/************************************************************
* create the text of the anonymous subroutine.
* we do not use a named subroutine so that we can call directly
* through the reference.
************************************************************/
prosrcdatum = SysCacheGetAttr(PROCOID, procTup,
Anum_pg_proc_prosrc, &isnull);
if (isnull)
elog(ERROR, "null prosrc");
proc_source = DatumGetCString(DirectFunctionCall1(textout,
prosrcdatum));
/************************************************************
* Create the procedure in the appropriate interpreter
************************************************************/
select_perl_context(prodesc->lanpltrusted);
prodesc->interp = plperl_active_interp;
plperl_create_sub(prodesc, proc_source, fn_oid);
activate_interpreter(oldinterp);
pfree(proc_source);
if (!prodesc->reference) /* can this happen? */
{
free(prodesc->proname);
free(prodesc);
elog(ERROR, "could not create PL/Perl internal procedure");
}
/************************************************************
* OK, link the procedure into the correct hashtable entry
************************************************************/
proc_key.user_id = prodesc->lanpltrusted ? GetUserId() : InvalidOid;
proc_ptr = hash_search(plperl_proc_hash, &proc_key,
HASH_ENTER, NULL);
proc_ptr->proc_ptr = prodesc;
}
ReleaseSysCache(procTup);
return prodesc;
}
/**********************************************************************
* plperl_hash_from_tuple() - Build a ref to a hash
* from all attributes of a given tuple
**********************************************************************/
static SV *
plperl_hash_from_tuple(HeapTuple tuple, TupleDesc tupdesc)
{
HV *hv;
int i;
hv = newHV();
for (i = 0; i < tupdesc->natts; i++)
{
Datum attr;
bool isnull;
char *attname;
char *outputstr;
Oid typoutput;
Oid typioparam;
bool typisvarlena;
int namelen;
if (tupdesc->attrs[i]->attisdropped)
continue;
attname = NameStr(tupdesc->attrs[i]->attname);
namelen = strlen(attname);
attr = heap_getattr(tuple, i + 1, tupdesc, &isnull);
if (isnull)
{
/* Store (attname => undef) and move on. */
(void) hv_store(hv, attname, namelen, newSV(0), 0);
continue;
}
/* XXX should have a way to cache these lookups */
getTypeOutputInfo(tupdesc->attrs[i]->atttypid,
&typoutput, &typioparam, &typisvarlena);
outputstr = DatumGetCString(OidFunctionCall3(typoutput,
attr,
ObjectIdGetDatum(typioparam),
Int32GetDatum(tupdesc->attrs[i]->atttypmod)));
(void) hv_store(hv, attname, namelen, newSVpv(outputstr, 0), 0);
pfree(outputstr);
}
return newRV_noinc((SV *) hv);
}
/*
* Implementation of spi_exec_query() Perl function
*/
HV *
plperl_spi_exec(char *query, int limit)
{
HV *ret_hv;
/*
* Execute the query inside a sub-transaction, so we can cope with errors
* sanely
*/
MemoryContext oldcontext = CurrentMemoryContext;
ResourceOwner oldowner = CurrentResourceOwner;
BeginInternalSubTransaction(NULL);
/* Want to run inside function's memory context */
MemoryContextSwitchTo(oldcontext);
PG_TRY();
{
int spi_rv;
spi_rv = SPI_execute(query, plperl_current_prodesc->fn_readonly,
limit);
ret_hv = plperl_spi_execute_fetch_result(SPI_tuptable, SPI_processed,
spi_rv);
/* Commit the inner transaction, return to outer xact context */
ReleaseCurrentSubTransaction();
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
/*
* AtEOSubXact_SPI() should not have popped any SPI context, but just
* in case it did, make sure we remain connected.
*/
SPI_restore_connection();
}
PG_CATCH();
{
ErrorData *edata;
/* Save error info */
MemoryContextSwitchTo(oldcontext);
edata = CopyErrorData();
FlushErrorState();
/* Abort the inner transaction */
RollbackAndReleaseCurrentSubTransaction();
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
/*
* If AtEOSubXact_SPI() popped any SPI context of the subxact, it will
* have left us in a disconnected state. We need this hack to return
* to connected state.
*/
SPI_restore_connection();
/* Punt the error to Perl */
croak("%s", edata->message);
/* Can't get here, but keep compiler quiet */
return NULL;
}
PG_END_TRY();
return ret_hv;
}
static HV *
plperl_spi_execute_fetch_result(SPITupleTable *tuptable, int processed,
int status)
{
HV *result;
result = newHV();
(void) hv_store(result, "status", strlen("status"),
newSVpv((char *) SPI_result_code_string(status), 0), 0);
(void) hv_store(result, "processed", strlen("processed"),
newSViv(processed), 0);
if (status == SPI_OK_SELECT)
{
AV *rows;
SV *row;
int i;
rows = newAV();
for (i = 0; i < processed; i++)
{
row = plperl_hash_from_tuple(tuptable->vals[i], tuptable->tupdesc);
av_push(rows, row);
}
(void) hv_store(result, "rows", strlen("rows"),
newRV_noinc((SV *) rows), 0);
}
SPI_freetuptable(tuptable);
return result;
}
/*
* Perl's own setlocal() copied from POSIX.xs
* (needed because of the calls to new_*())
*/
#ifdef WIN32
static char *
setlocale_perl(int category, char *locale)
{
char *RETVAL = setlocale(category, locale);
if (RETVAL)
{
#ifdef USE_LOCALE_CTYPE
if (category == LC_CTYPE
#ifdef LC_ALL
|| category == LC_ALL
#endif
)
{
char *newctype;
#ifdef LC_ALL
if (category == LC_ALL)
newctype = setlocale(LC_CTYPE, NULL);
else
#endif
newctype = RETVAL;
new_ctype(newctype);
}
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
if (category == LC_COLLATE
#ifdef LC_ALL
|| category == LC_ALL
#endif
)
{
char *newcoll;
#ifdef LC_ALL
if (category == LC_ALL)
newcoll = setlocale(LC_COLLATE, NULL);
else
#endif
newcoll = RETVAL;
new_collate(newcoll);
}
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
if (category == LC_NUMERIC
#ifdef LC_ALL
|| category == LC_ALL
#endif
)
{
char *newnum;
#ifdef LC_ALL
if (category == LC_ALL)
newnum = setlocale(LC_NUMERIC, NULL);
else
#endif
newnum = RETVAL;
new_numeric(newnum);
}
#endif /* USE_LOCALE_NUMERIC */
}
return RETVAL;
}
#endif
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