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plr.c
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plr.c
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/*
* PL/R - PostgreSQL support for R as a
* procedural language (PL)
*
* Copyright (c) 2003 by Joseph E. Conway
* ALL RIGHTS RESERVED
*
* Joe Conway <[email protected]>
*
* Based on pltcl by Jan Wieck
* and inspired by REmbeddedPostgres by
* Duncan Temple Lang <[email protected]>
* http://www.omegahat.org/RSPostgres/
*
* License: GPL version 2 or newer. http://www.gnu.org/copyleft/gpl.html
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* plr.c - Language handler and support functions
*/
#include "plr.h"
PG_MODULE_MAGIC;
/*
* Structure for wrapping R_ParseVector call into R_TopLevelExec
*/
typedef struct {
SEXP in, out;
ParseStatus status;
} ProtectedParseData;
/*
* Global data
*/
MemoryContext plr_caller_context;
MemoryContext plr_SPI_context = NULL;
HTAB *plr_HashTable = (HTAB *) NULL;
char *last_R_error_msg = NULL;
static bool plr_pm_init_done = false;
static bool plr_be_init_done = false;
/* namespace OID for the PL/R language handler function */
static Oid plr_nspOid = InvalidOid;
int R_SignalHandlers = 1; /* Exposed in R_interface.h */
/*
* defines
*/
/* real max is 3 (for "PLR") plus number of characters in an Oid */
#define MAX_PRONAME_LEN NAMEDATALEN
#define OPTIONS_NULL_CMD "options(error = expression(NULL))"
#define THROWRERROR_CMD \
"pg.throwrerror <-function(msg) " \
"{" \
" msglen <- nchar(msg);" \
" if (substr(msg, msglen, msglen + 1) == \"\\n\")" \
" msg <- substr(msg, 1, msglen - 1);" \
" .C(\"throw_r_error\", as.character(msg));" \
"}"
#define OPTIONS_THROWRERROR_CMD \
"options(error = expression(pg.throwrerror(geterrmessage())))"
#define THROWLOG_CMD \
"pg.throwlog <-function(msg) " \
"{.C(\"throw_pg_log\", as.integer(" CppAsString2(LOG) "), as.character(msg));invisible()}"
#define THROWWARNING_CMD \
"pg.throwwarning <-function(msg) " \
"{.C(\"throw_pg_log\", as.integer(" CppAsString2(WARNING) "), as.character(msg));invisible()}"
#define THROWNOTICE_CMD \
"pg.thrownotice <-function(msg) " \
"{.C(\"throw_pg_log\", as.integer(" CppAsString2(NOTICE) "), as.character(msg));invisible()}"
#define THROWERROR_CMD \
"pg.throwerror <-function(msg) " \
"{stop(msg, call. = FALSE)}"
#define OPTIONS_THROWWARN_CMD \
"options(warning.expression = expression(pg.thrownotice(last.warning)))"
#define QUOTE_LITERAL_CMD \
"pg.quoteliteral <-function(sql) " \
"{.Call(\"plr_quote_literal\", sql)}"
#define QUOTE_IDENT_CMD \
"pg.quoteident <-function(sql) " \
"{.Call(\"plr_quote_ident\", sql)}"
#define SPI_EXEC_CMD \
"pg.spi.exec <-function(sql) {.Call(\"plr_SPI_exec\", sql)}"
#define SPI_PREPARE_CMD \
"pg.spi.prepare <-function(sql, argtypes = NA) " \
"{.Call(\"plr_SPI_prepare\", sql, argtypes)}"
#define SPI_EXECP_CMD \
"pg.spi.execp <-function(sql, argvalues = NA) " \
"{.Call(\"plr_SPI_execp\", sql, argvalues)}"
#define SPI_CURSOR_OPEN_CMD \
"pg.spi.cursor_open<-function(cursor_name,plan,argvalues=NA) " \
"{.Call(\"plr_SPI_cursor_open\",cursor_name,plan,argvalues)}"
#define SPI_CURSOR_FETCH_CMD \
"pg.spi.cursor_fetch<-function(cursor,forward,rows) " \
"{.Call(\"plr_SPI_cursor_fetch\",cursor,forward,rows)}"
#define SPI_CURSOR_MOVE_CMD \
"pg.spi.cursor_move<-function(cursor,forward,rows) " \
"{.Call(\"plr_SPI_cursor_move\",cursor,forward,rows)}"
#define SPI_CURSOR_CLOSE_CMD \
"pg.spi.cursor_close<-function(cursor) " \
"{.Call(\"plr_SPI_cursor_close\",cursor)}"
#if CATALOG_VERSION_NO < 201811201
#define SPI_LASTOID_CMD \
"pg.spi.lastoid <-function() " \
"{.Call(\"plr_SPI_lastoid\")}"
#endif
#if PG_VERSION_NUM >= 110000
#define SPI_COMMIT_CMD \
"pg.spi.commit <-function() " \
"{.Call(\"plr_SPI_commit\")}"
#define SPI_ROLLBACK_CMD \
"pg.spi.rollback <-function() " \
"{.Call(\"plr_SPI_rollback\")}"
#endif
#define SPI_DBDRIVER_CMD \
"dbDriver <-function(db_name)\n" \
"{return(NA)}"
#define SPI_DBCONN_CMD \
"dbConnect <- function(drv,user=\"\",password=\"\",host=\"\",dbname=\"\",port=\"\",tty =\"\",options=\"\")\n" \
"{return(NA)}"
#define SPI_DBSENDQUERY_CMD \
"dbSendQuery <- function(conn, sql) {\n" \
"plan <- pg.spi.prepare(sql)\n" \
"cursor_obj <- pg.spi.cursor_open(\"plr_cursor\",plan)\n" \
"return(cursor_obj)\n" \
"}"
#define SPI_DBFETCH_CMD \
"fetch <- function(rs,n) {\n" \
"data <- pg.spi.cursor_fetch(rs, TRUE, as.integer(n))\n" \
"return(data)\n" \
"}"
#define SPI_DBCLEARRESULT_CMD \
"dbClearResult <- function(rs) {\n" \
"pg.spi.cursor_close(rs)\n" \
"}"
#define SPI_DBGETQUERY_CMD \
"dbGetQuery <-function(conn, sql) {\n" \
"data <- pg.spi.exec(sql)\n" \
"return(data)\n" \
"}"
#define SPI_DBREADTABLE_CMD \
"dbReadTable <- function(con, name, row.names = \"row_names\", check.names = TRUE) {\n" \
"data <- dbGetQuery(con, paste(\"SELECT * from\", name))\n" \
"return(data)\n" \
"}"
#define SPI_DBDISCONN_CMD \
"dbDisconnect <- function(con)\n" \
"{return(NA)}"
#define SPI_DBUNLOADDRIVER_CMD \
"dbUnloadDriver <-function(drv)\n" \
"{return(NA)}"
#define SPI_FACTOR_CMD \
"pg.spi.factor <- function(arg1) {\n" \
" for (col in 1:ncol(arg1)) {\n" \
" if (!is.numeric(arg1[,col])) {\n" \
" arg1[,col] <- factor(arg1[,col])\n" \
" }\n" \
" }\n" \
" return(arg1)\n" \
"}"
#define REVAL \
"pg.reval <- function(arg1) {eval(parse(text = arg1))}"
#define PG_STATE_FIRSTPASS \
"pg.state.firstpass <- TRUE"
#define CurrentTriggerData ((TriggerData *) fcinfo->context)
/*
* static declarations
*/
static void plr_atexit(void);
static void plr_load_builtins(Oid langOid);
static void plr_init_all(Oid langOid);
static Datum plr_trigger_handler(PG_FUNCTION_ARGS);
static Datum plr_func_handler(PG_FUNCTION_ARGS);
static plr_function *compile_plr_function(FunctionCallInfo fcinfo);
static plr_function *do_compile(FunctionCallInfo fcinfo,
HeapTuple procTup,
plr_func_hashkey *hashkey);
static void plr_protected_parse(void* data);
static SEXP plr_parse_func_body(const char *body);
#if (PG_VERSION_NUM >= 120000)
static SEXP plr_convertargs(plr_function *function, NullableDatum *args, FunctionCallInfo fcinfo, SEXP rho);
#else
static SEXP plr_convertargs(plr_function *function, Datum *arg, bool *argnull, FunctionCallInfo fcinfo, SEXP rho);
#endif
static void plr_error_callback(void *arg);
static void remove_carriage_return(char* p);
static Oid getNamespaceOidFromLanguageOid(Oid langOid);
static bool haveModulesTable(Oid nspOid);
static char *getModulesSql(Oid nspOid);
#ifdef HAVE_WINDOW_FUNCTIONS
// See full definition in src/backend/executor/nodeWindowAgg.c
typedef struct WindowObjectData
{
NodeTag type;
WindowAggState *winstate; /* parent WindowAggState */
} WindowObjectData;
static const char PLR_WINDOW_FRAME_NAME[] = "plr_window_frame";
#define PLR_WINDOW_ENV_NAME_MAX_LENGTH 30
static const char PLR_WINDOW_ENV_PATTERN[] = "window_env_%p";
static bool plr_is_unbound_frame(WindowObject winobj);
#endif
static void plr_resolve_polymorphic_argtypes(int numargs,
Oid *argtypes, char *argmodes,
Node *call_expr, bool forValidator,
const char *proname);
/*
* plr_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
* PL/R procedures.
*/
PG_FUNCTION_INFO_V1(plr_call_handler);
Datum
plr_call_handler(PG_FUNCTION_ARGS)
{
#if PG_VERSION_NUM >= 110000
bool nonatomic;
#endif
Datum retval;
#if PG_VERSION_NUM >= 110000
nonatomic = fcinfo->context &&
IsA(fcinfo->context, CallContext) &&
!castNode(CallContext, fcinfo->context)->atomic;
#endif
/* save caller's context */
plr_caller_context = CurrentMemoryContext;
#if PG_VERSION_NUM >= 110000
if (SPI_connect_ext(nonatomic ? SPI_OPT_NONATOMIC : 0) != SPI_OK_CONNECT)
#else
if (SPI_connect() != SPI_OK_CONNECT)
#endif
elog(ERROR, "SPI_connect failed");
plr_SPI_context = CurrentMemoryContext;
MemoryContextSwitchTo(plr_caller_context);
/* initialize R if needed */
if (!plr_be_init_done) {
HeapTuple procedureTuple;
Form_pg_proc procedureStruct;
Oid language;
/* get the pg_proc entry */
procedureTuple = SearchSysCache(PROCOID,
ObjectIdGetDatum(fcinfo->flinfo->fn_oid),
0, 0, 0);
if (!HeapTupleIsValid(procedureTuple))
/* internal error */
elog(ERROR, "cache lookup failed for function %u", fcinfo->flinfo->fn_oid);
procedureStruct = (Form_pg_proc)GETSTRUCT(procedureTuple);
/* now get the pg_language entry */
language = procedureStruct->prolang;
ReleaseSysCache(procedureTuple);
plr_init_all(language);
}
if (CALLED_AS_TRIGGER(fcinfo))
retval = plr_trigger_handler(fcinfo);
else
retval = plr_func_handler(fcinfo);
return retval;
}
PG_FUNCTION_INFO_V1(plr_inline_handler);
Datum
plr_inline_handler(PG_FUNCTION_ARGS)
{
const InlineCodeBlock * const icb = (InlineCodeBlock *)PG_GETARG_POINTER(0);
char * src = icb->source_text;
Oid langOid = icb->langOid;
/* initialize R if needed */
/* save caller's context */
plr_caller_context = CurrentMemoryContext;
if (SPI_connect() != SPI_OK_CONNECT)
elog(ERROR, "SPI_connect failed");
plr_SPI_context = CurrentMemoryContext;
MemoryContextSwitchTo(plr_caller_context);
plr_init_all(langOid);
remove_carriage_return(src);
load_r_cmd(src);
if (SPI_finish() != SPI_OK_FINISH)
elog(ERROR, "SPI_finish failed");
PG_RETURN_VOID();
}
PG_FUNCTION_INFO_V1(plr_validator);
Datum
plr_validator(PG_FUNCTION_ARGS)
{
Datum prosrcdatum;
HeapTuple procTup;
bool isnull;
char *proc_source,
*body;
Oid funcoid = PG_GETARG_OID(0);
if (!check_function_bodies || !CheckFunctionValidatorAccess(fcinfo->flinfo->fn_oid, funcoid))
PG_RETURN_VOID();
procTup = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcoid));
if (!HeapTupleIsValid(procTup))
elog(ERROR, "cache lookup failed for function %u", funcoid);
/* Add user's function definition to proc body */
prosrcdatum = SysCacheGetAttr(PROCOID, procTup,
Anum_pg_proc_prosrc, &isnull);
if (isnull)
elog(ERROR, "null prosrc");
proc_source = DatumGetCString(DirectFunctionCall1(textout, prosrcdatum));
ReleaseSysCache(procTup);
remove_carriage_return(proc_source);
if (!plr_pm_init_done)
plr_init();
body = (char *) palloc(strlen(proc_source) + 3); /* {}\x00 */
if (NULL == body)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
sprintf(body, "{%s}", proc_source);
pfree(proc_source);
plr_parse_func_body(body);
pfree(body);
PG_RETURN_VOID();
}
void
load_r_cmd(const char *cmd)
{
SEXP cmdexpr;
int i,
status;
/*
* Init if not already done. This can happen when PL/R is not preloaded
* and reload_plr_modules() or install_rcmd() is called by the user prior
* to any PL/R functions.
*/
if (!plr_pm_init_done)
plr_init();
PROTECT(cmdexpr = plr_parse_func_body(cmd));
/* Loop is needed here as EXPSEXP may be of length > 1 */
for(i = 0; i < length(cmdexpr); i++)
{
R_tryEval(VECTOR_ELT(cmdexpr, i), R_GlobalEnv, &status);
if(status != 0)
{
UNPROTECT(1);
if (last_R_error_msg)
ereport(ERROR,
(errcode(ERRCODE_DATA_EXCEPTION),
errmsg("R interpreter expression evaluation error"),
errdetail("%s", last_R_error_msg)));
else
ereport(ERROR,
(errcode(ERRCODE_DATA_EXCEPTION),
errmsg("R interpreter expression evaluation error"),
errdetail("R expression evaluation error caught " \
"in \"%s\".", cmd)));
}
}
UNPROTECT(1);
}
/*
* plr_cleanup() - Let the embedded interpreter clean up after itself
*
* DO NOT make this static --- it has to be registered as an on_proc_exit()
* callback
*/
void
PLR_CLEANUP
{
char *buf;
char *tmpdir = getenv("R_SESSION_TMPDIR");
R_dot_Last();
R_RunExitFinalizers();
KillAllDevices();
if(tmpdir)
{
int rv;
/*
* length needed = 'rm -rf ""' == 9
* plus 1 for NULL terminator
* plus length of dir string
*/
buf = (char *) palloc(9 + 1 + strlen(tmpdir));
sprintf(buf, "rm -rf \"%s\"", tmpdir);
/* ignoring return value */
rv = system(buf);
if (rv != 0)
; /* do nothing */
}
}
static void
plr_atexit(void)
{
/* only react during plr startup */
if (plr_pm_init_done)
return;
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("the R interpreter did not initialize"),
errhint("R_HOME must be correct in the environment " \
"of the user that starts the postmaster process.")));
}
/*
* plr_init() - Initialize all that's safe to do in the postmaster
*
* DO NOT make this static --- it has to be callable by preload
*/
void
plr_init(void)
{
char *r_home;
int rargc;
char *rargv[] = {"PL/R", "--slave", "--silent", "--no-save", "--no-restore"};
/* refuse to init more than once */
if (plr_pm_init_done)
return;
#ifdef WIN32
r_home = get_R_HOME();
#else
/* refuse to start if R_HOME is not defined */
r_home = getenv("R_HOME");
#endif
if (r_home == NULL)
{
size_t rh_len = strlen(R_HOME_DEFAULT);
/* see if there is a compiled in default R_HOME */
if (rh_len)
{
char *rhenv;
MemoryContext oldcontext;
/* Needs to live until/unless we explicitly delete it */
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
rhenv = palloc(8 + rh_len);
MemoryContextSwitchTo(oldcontext);
sprintf(rhenv, "R_HOME=%s", R_HOME_DEFAULT);
putenv(rhenv);
}
else
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("environment variable R_HOME not defined"),
errhint("R_HOME must be defined in the environment " \
"of the user that starts the postmaster process.")));
}
rargc = sizeof(rargv)/sizeof(rargv[0]);
/*
* register an exit callback to handle the case where R does not initialize
* and just exits with R_suicide()
*/
atexit(plr_atexit);
/*
* Stop R using its own signal handlers
*/
R_SignalHandlers = 0;
/*
* When initialization fails, R currently exits. Check the return
* value anyway in case this ever gets fixed
*/
if (!Rf_initEmbeddedR(rargc, rargv))
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("the R interpreter did not initialize"),
errhint("R_HOME must be correct in the environment " \
"of the user that starts the postmaster process.")));
/* arrange for automatic cleanup at proc_exit */
on_proc_exit(plr_cleanup, 0);
#ifndef WIN32
/*
* Force non-interactive mode since R may not do so.
* See comment in Rembedded.c just after R_Interactive = TRUE:
* "Rf_initialize_R set this based on isatty"
* If Postgres still has the tty attached, R_Interactive remains TRUE
*/
R_Interactive = false;
#endif
plr_pm_init_done = true;
}
#ifdef HAVE_WINDOW_FUNCTIONS
/*
* plr_is_unbound_frame - return true if window function frame is unbound, i.e. whole partition
*/
static bool
plr_is_unbound_frame(WindowObject winobj)
{
WindowAgg* node = (WindowAgg *)winobj->winstate->ss.ps.plan;
int frameOptions = winobj->winstate->frameOptions;
static const int unbound_mask = FRAMEOPTION_START_UNBOUNDED_PRECEDING | FRAMEOPTION_END_UNBOUNDED_FOLLOWING;
return
#if PG_VERSION_NUM >= 110000
0 == (frameOptions & (FRAMEOPTION_GROUPS | FRAMEOPTION_EXCLUDE_CURRENT_ROW | FRAMEOPTION_EXCLUDE_GROUP | FRAMEOPTION_EXCLUDE_TIES)) &&
#endif
((0 == node->ordNumCols && frameOptions & FRAMEOPTION_RANGE) || unbound_mask == (frameOptions & unbound_mask));
}
#endif
/*
* plr_load_builtins() - load "builtin" PL/R functions into R interpreter
*/
static void
plr_load_builtins(Oid langOid)
{
int j;
char *cmd;
char *cmds[] =
{
/* first turn off error handling by R */
OPTIONS_NULL_CMD,
/* set up the postgres error handler in R */
THROWRERROR_CMD,
OPTIONS_THROWRERROR_CMD,
THROWLOG_CMD,
THROWNOTICE_CMD,
THROWWARNING_CMD,
THROWERROR_CMD,
OPTIONS_THROWWARN_CMD,
/* install the commands for SPI support in the interpreter */
QUOTE_LITERAL_CMD,
QUOTE_IDENT_CMD,
SPI_EXEC_CMD,
SPI_PREPARE_CMD,
SPI_EXECP_CMD,
SPI_CURSOR_OPEN_CMD,
SPI_CURSOR_FETCH_CMD,
SPI_CURSOR_MOVE_CMD,
SPI_CURSOR_CLOSE_CMD,
#if CATALOG_VERSION_NO < 201811201
SPI_LASTOID_CMD,
#endif
#if PG_VERSION_NUM >= 110000
SPI_COMMIT_CMD,
SPI_ROLLBACK_CMD,
#endif
SPI_DBDRIVER_CMD,
SPI_DBCONN_CMD,
SPI_DBSENDQUERY_CMD,
SPI_DBFETCH_CMD,
SPI_DBCLEARRESULT_CMD,
SPI_DBGETQUERY_CMD,
SPI_DBREADTABLE_CMD,
SPI_DBDISCONN_CMD,
SPI_DBUNLOADDRIVER_CMD,
SPI_FACTOR_CMD,
/* handy predefined R functions */
REVAL,
/* terminate */
NULL
};
/*
* temporarily turn off R error reporting -- it will be turned back on
* once the custom R error handler is installed from the plr library
*/
load_r_cmd(cmds[0]);
/* next load the plr library into R */
load_r_cmd(get_load_self_ref_cmd(langOid));
/*
* run the rest of the R bootstrap commands, being careful to start
* at cmds[1] since we already executed cmds[0]
*/
for (j = 1; (cmd = cmds[j]); j++)
load_r_cmd(cmds[j]);
}
/*
* plr_load_modules() - Load procedures from
* table plr_modules (if it exists)
*
* The caller is responsible to ensure SPI has already been connected
* DO NOT make this static --- it has to be callable by reload_plr_modules()
*/
void
plr_load_modules(void)
{
int spi_rc;
char *cmd;
int i;
int fno;
MemoryContext oldcontext;
char *modulesSql;
/* switch to SPI memory context */
SWITCHTO_PLR_SPI_CONTEXT(oldcontext);
/*
* Check if table plr_modules exists
*/
if (!haveModulesTable(plr_nspOid))
{
/* clean up if SPI was used, and regardless restore caller's context */
CLEANUP_PLR_SPI_CONTEXT(oldcontext);
return;
}
/* plr_modules table exists -- get SQL code extract table's contents */
modulesSql = getModulesSql(plr_nspOid);
/* Read all the row's from it in the order of modseq */
spi_rc = SPI_exec(modulesSql, 0);
/* modulesSql no longer needed -- cleanup */
pfree(modulesSql);
if (spi_rc != SPI_OK_SELECT)
/* internal error */
elog(ERROR, "plr_init_load_modules: select from plr_modules failed");
/* If there's nothing, no modules exist */
if (SPI_processed == 0)
{
SPI_freetuptable(SPI_tuptable);
/* clean up if SPI was used, and regardless restore caller's context */
CLEANUP_PLR_SPI_CONTEXT(oldcontext);
return;
}
/*
* There is at least on module to load. Get the
* source from the modsrc load it in the R interpreter
*/
fno = SPI_fnumber(SPI_tuptable->tupdesc, "modsrc");
for (i = 0; i < SPI_processed; i++)
{
cmd = SPI_getvalue(SPI_tuptable->vals[i],
SPI_tuptable->tupdesc, fno);
if (cmd != NULL)
{
load_r_cmd(cmd);
pfree(cmd);
}
}
SPI_freetuptable(SPI_tuptable);
/* clean up if SPI was used, and regardless restore caller's context */
CLEANUP_PLR_SPI_CONTEXT(oldcontext);
}
static void
plr_init_all(Oid langOid)
{
MemoryContext oldcontext;
/* everything initialized needs to live until/unless we explicitly delete it */
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
/* execute postmaster-startup safe initialization */
if (!plr_pm_init_done)
plr_init();
/*
* Any other initialization that must be done each time a new
* backend starts:
*/
if (!plr_be_init_done)
{
/* load "builtin" R functions */
plr_load_builtins(langOid);
/* obtain & store namespace OID of PL/R language handler */
plr_nspOid = getNamespaceOidFromLanguageOid(langOid);
/* try to load procedures from plr_modules */
plr_load_modules();
plr_be_init_done = true;
}
/* switch back to caller's context */
MemoryContextSwitchTo(oldcontext);
}
static Datum
plr_trigger_handler(PG_FUNCTION_ARGS)
{
plr_function *function;
SEXP fun;
SEXP rargs;
SEXP rvalue;
Datum retval;
#if (PG_VERSION_NUM >= 120000)
NullableDatum args[FUNC_MAX_ARGS];
#else
Datum arg[FUNC_MAX_ARGS];
bool argnull[FUNC_MAX_ARGS];
#endif
TriggerData *trigdata = (TriggerData *) fcinfo->context;
TupleDesc tupdesc = trigdata->tg_relation->rd_att;
Datum *dvalues;
ArrayType *array;
#define FIXED_NUM_DIMS 1
int ndims = FIXED_NUM_DIMS;
int dims[FIXED_NUM_DIMS];
int lbs[FIXED_NUM_DIMS];
#undef FIXED_NUM_DIMS
TRIGGERTUPLEVARS;
ERRORCONTEXTCALLBACK;
int i;
if (trigdata->tg_trigger->tgnargs > 0)
dvalues = palloc(trigdata->tg_trigger->tgnargs * sizeof(Datum));
else
dvalues = NULL;
/* Find or compile the function */
function = compile_plr_function(fcinfo);
/* set up error context */
PUSH_PLERRCONTEXT(plr_error_callback, function->proname);
/*
* Build up arguments for the trigger function. The data types
* are mostly hardwired in advance
*/
/* first is trigger name */
SET_ARG(DirectFunctionCall1(textin,
CStringGetDatum(trigdata->tg_trigger->tgname)),false,0);
/* second is trigger relation oid */
SET_ARG(ObjectIdGetDatum(trigdata->tg_relation->rd_id),false,1);
/* third is trigger relation name */
SET_ARG(DirectFunctionCall1(textin,
CStringGetDatum(get_rel_name(trigdata->tg_relation->rd_id))),false,2);
/* fourth is when trigger fired, i.e. BEFORE or AFTER */
if (TRIGGER_FIRED_BEFORE(trigdata->tg_event))
SET_ARG(DirectFunctionCall1(textin,
CStringGetDatum("BEFORE")),false,3);
else if (TRIGGER_FIRED_AFTER(trigdata->tg_event))
SET_ARG(DirectFunctionCall1(textin,
CStringGetDatum("AFTER")),false,3);
else
/* internal error */
elog(ERROR, "unrecognized tg_event");
/*
* fifth is level trigger fired, i.e. ROW or STATEMENT
* sixth is operation that fired trigger, i.e. INSERT, UPDATE, or DELETE
* seventh is NEW, eighth is OLD
*/
if (TRIGGER_FIRED_FOR_STATEMENT(trigdata->tg_event))
{
SET_ARG(DirectFunctionCall1(textin,
CStringGetDatum("STATEMENT")),false,4);
if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
SET_ARG(DirectFunctionCall1(textin, CStringGetDatum("INSERT")),false,5);
else if (TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
SET_ARG(DirectFunctionCall1(textin, CStringGetDatum("DELETE")),false,5);
else if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
SET_ARG(DirectFunctionCall1(textin, CStringGetDatum("UPDATE")),false,5);
else
/* internal error */
elog(ERROR, "unrecognized tg_event");
SET_ARG((Datum) 0,true,6);
SET_ARG((Datum) 0,true,7);
}
else if (TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
{
SET_ARG(DirectFunctionCall1(textin,
CStringGetDatum("ROW")),false,4);
if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
SET_INSERT_ARGS_567;
else if (TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
SET_DELETE_ARGS_567;
else if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
SET_UPDATE_ARGS_567;
else
/* internal error */
elog(ERROR, "unrecognized tg_event");
}
else
/* internal error */
elog(ERROR, "unrecognized tg_event");
/*
* finally, ninth argument is a text array of trigger arguments
*/
for (i = 0; i < trigdata->tg_trigger->tgnargs; i++)
dvalues[i] = DirectFunctionCall1(textin,
CStringGetDatum(trigdata->tg_trigger->tgargs[i]));
dims[0] = trigdata->tg_trigger->tgnargs;
lbs[0] = 1;
array = construct_md_array(dvalues, NULL, ndims, dims, lbs,
TEXTOID, -1, false, 'i');
SET_ARG(PointerGetDatum(array),false,8);
/*
* All done building args; from this point it is just like
* calling a non-trigger function, except we need to be careful
* that the return value tuple is the same tupdesc as the trigger tuple.
*/
PROTECT(fun = function->fun);
/* Convert all call arguments */
#if (PG_VERSION_NUM >= 120000)
PROTECT(rargs = plr_convertargs(function, args, fcinfo, R_NilValue));
#else
PROTECT(rargs = plr_convertargs(function, arg, argnull, fcinfo, R_NilValue));
#endif
/* Call the R function */
PROTECT(rvalue = call_r_func(fun, rargs, R_GlobalEnv));
/*
* Convert the return value from an R object to a Datum.
* We expect r_get_pg to do the right thing with missing or empty results.
*/
if (SPI_finish() != SPI_OK_FINISH)
elog(ERROR, "SPI_finish failed");
retval = r_get_pg(rvalue, function, fcinfo);
POP_PLERRCONTEXT;
UNPROTECT(3);
return retval;
}
static Datum
plr_func_handler(PG_FUNCTION_ARGS)
{
plr_function *function;
SEXP fun;
SEXP env = R_GlobalEnv;
SEXP rargs;
SEXP rvalue;
Datum retval;
#ifdef HAVE_WINDOW_FUNCTIONS
WindowObject winobj = NULL; //set to NULL to silence compiler warnings
char internal_env[PLR_WINDOW_ENV_NAME_MAX_LENGTH];
int64 current_row = -1;
int check_err;
#endif
ERRORCONTEXTCALLBACK;
/* Find or compile the function */
function = compile_plr_function(fcinfo);
/* set up error context */
PUSH_PLERRCONTEXT(plr_error_callback, function->proname);
PROTECT(fun = function->fun);
#ifdef HAVE_WINDOW_FUNCTIONS
if (function->iswindow)
{
winobj = PG_WINDOW_OBJECT();
current_row = WinGetCurrentPosition(winobj);
sprintf(internal_env, PLR_WINDOW_ENV_PATTERN, winobj);
if (0 == current_row)
{
env = R_tryEval(lang2(install("new.env"), R_GlobalEnv), R_GlobalEnv, &check_err);
if (check_err)
elog(ERROR, "Failed to create new environment \"%s\" for window function calls.", internal_env);
defineVar(install(internal_env), env, R_GlobalEnv);
}
else
{
env = findVar(install(internal_env), R_GlobalEnv);
if (R_UnboundValue == env)
elog(ERROR, "%s window frame environment cannot be found in R_GlobalEnv", internal_env);
}
}
#endif
/* Convert all call arguments */
#if (PG_VERSION_NUM >= 120000)
PROTECT(rargs = plr_convertargs(function, fcinfo->args, fcinfo, env));
#else
PROTECT(rargs = plr_convertargs(function, fcinfo->arg, fcinfo->argnull, fcinfo, env));
#endif
/* Call the R function */
PROTECT(rvalue = call_r_func(fun, rargs, env));
#ifdef HAVE_WINDOW_FUNCTIONS
/* We should remove window_env_XXX environment along with frame data list after last call */
if (function->iswindow && plr_is_unbound_frame(winobj)
&& WinGetPartitionRowCount(winobj) == current_row + 1)
R_tryEval(lang2(install("rm"), install(internal_env)), R_GlobalEnv, &check_err);
#endif
/*
* Convert the return value from an R object to a Datum.
* We expect r_get_pg to do the right thing with missing or empty results.
*/
if (SPI_finish() != SPI_OK_FINISH)
elog(ERROR, "SPI_finish failed");
retval = r_get_pg(rvalue, function, fcinfo);
POP_PLERRCONTEXT;
UNPROTECT(3);
return retval;
}
/* ----------
* compile_plr_function
*
* Note: it's important for this to fall through quickly if the function
* has already been compiled.
* ----------
*/
plr_function *
compile_plr_function(FunctionCallInfo fcinfo)
{
Oid funcOid = fcinfo->flinfo->fn_oid;
HeapTuple procTup;
Form_pg_proc procStruct;
plr_function *function;
plr_func_hashkey hashkey;
bool hashkey_valid = false;
ERRORCONTEXTCALLBACK;
/*
* Lookup the pg_proc tuple by Oid; we'll need it in any case
*/
procTup = SearchSysCache(PROCOID,